Scicence questions For X class


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Science (Human Eye & Colourful World)  SS2

Q. 1. What is the speed of light in vacuum?

Q. 2. Which image can be obtained on the screen?

Q. 3. What sign convection has been given to the focal length of (1) a concave mirror (2)  a convex mirror?

Q. 4. What is the significance of +v sign of magnification?

Q. 5. If the radius of curvature of a concave mirror is 20cm, what is its focal length?

Q. 6. Define angle of refraction?

Q. 7. Define one dioptre?

Q. 8. What is lens formula?

Q. 9. Write down the magnification formula for a lens in term of object distance and image distance. How does it differ from the corresponding formula for a mirror?

 Q. 10. Define refractive index?

 Q. 11. State two effects caused by the refraction of light?

 Q. 12. Give the laws of reflection?

 Q. 13. Give an example of each type of image?

 Q. 14. For magnification m=+1 for a plane mirror, what does this signify for: m=1 and   +ve sign for m

Q. 15. Describe the nature of the image formed when the object is placed at a distance of 20cm from a concave mirror of focal length 10cm?

Q. 16. Define reflection, incident light, reflected light, angle of incidence and angle of reflection?

Q. 17. Define the centre of curvature, radius of curvature, pole, principle axis of a spherical mirror and focus?

Q. 18. Why does a concave mirror have a real principal focus?

Q. 19. Draw a labelled diagram showing how a plane mirror forms an image. Also write the characteristics of the image?

Q. 20. Explain lateral inversion?

Q. 21. Give the various rules for obtained images formed by a concave mirror?

Q. 22. Explain the cartesian sign convection for a spherical mirror?

Q. 23. An object 1cm high is placed on the axis and 15cm from a concave mirror of focal length 10cm. Find the position, nature, magnification and size of the image?

Q. 24. An object 5cm is length is placed at a distance of 20cm in from of a convex mirror or radius of curvature 30cm. Find the position of the image, its nature and size?

Q. 25. An object placed 20 cm in front of a mirror is found to have an image 15cm (a) in front of it, (b) behind it. Find the focal length of the mirror and the kind of mirror in each case?

Q. 26. Show by ray diagram the formation of an image by a convex mirror?]

Q. 27. What do you mean by colour mixing by subtraction?

 Q. 28. What will happen to a ray of light when it falls normally on a surface?

 Q. 29. What will happen to a ray of light when it travels from a denser medium to a rarer medium?

 Q. 30. What is power of a lens?

 Q. 31. Why do planets not twinkle?

 Q. 32. What determines the colour of an object in daylight?

 Q. 33. How is the image formed by a convex lens?

 Q. 34. Explain total internal reflection?

 Q. 35. A concave lens of focal length 15cm forms an image 10cm from lens. How far is the object be placed from the lens? Draw the ray diagram.

Science (Heridity & Evolution)SS2

Q. 1. Describe the structure of chromosones?

Q. 2. Give the functions of chromosomes?

Q. 3. How do mendel’s experiments show that traits may be dominant recessive?

Q. 4. What are the different ways in which individuals with a particular trait may increase in population?

Q. 5. Why are traits acquired during the time of an individual not inherited?

Q. 6. How do mendel’s experiment show that trait are inherited independently?

Q. 7. How is sex determined in human beings?

Q. 8. How does the creation of variations in species promote?

Q. 9. Why are the small number of surviving tigers a cause of worry from the point of view of genetics?

Q. 10. How is the equal genetic contribution of male and female parents ensured in the progeny?

Science (How do Organisms Reproduce)

Q. 1. Define reproductions?

Q. 2. What is the importance of dna copying in reproduction?

Q. 3. Where is the male gamete formed in a flowering plant?

Q. 4. How many male gametes are present in one pollel-grain?

Q. 5. What is puberty?

Q. 6. What is gestation?

Q. 7. What is fission?

Q. 8. Where the anther contains sepal, ovules and pollel-grains?

Q. 9. Define vegitative propagation. Name its three methods of vegetative propagation used by the gardners to grow plants?

Q. 10. What are the advantages of vegetative propagation?

Q. 11. Why is dna copying an essential part of the process of reproduction?

Q. 12. How is the process of pollination different from fertilization?

Q. 13. What are changes seen in the girls at the time of puberty?

Q. 14. What are the different methods of contraception?

Q. 15. Distinguish between asexual reproduction and sexual reproduction?

Q. 16. Describe the menstrual cycle in female?

Q. 17. Why is variation beneficial to the species but not necessarily for the individual?

Q. 18. How does the embroy get nourishment inside the mother’s body?

Q. 19. What are the function performed by the testis in human beings?

Science (Control & coordination)

Q. 1. Why does living organisms show movement?

Q. 2. Name the organs of our peripheral nervous system?

Q. 3. What happens at the synapse between two neurons?

Q. 4. What are nastic movements?

Q. 5. Give an example of plant hormone that promotest growth?

Q. 6. Which signals will get disturbed in case of a spinal cord injury?

Q. 7. What is the role of brain in reflex action?

Q. 8. Why are some patients of diabetes treated by giving injections of insulin hormone?

Q. 9. What is the need for a system of control and co-ordination in an organism?

Q. 10. Differentitate between endocrine gland and dexocrine gland?

Q. 11. Write some characteristics of hormones of animals?

Q. 12. Compare and contrast nervous and hormonal mechanisms for control and co-ordination in the animals?

Q. 13. Give various functions performed by plant hormones?

Q. 14. What is reflex action and reflex arc? Explain with the help of examples:

Q. 15. Give the various functions of brain?

Q. 16. What is the difference between reflex action and walking?

Science (Human Eye & Colourful World)SS2

Q. 1. What is the least distance of distinct vision of a normal human eyes?

 Q. 2. Define power of accommodation?

 Q. 3. What is the type of lens used for correcting myopaia (short sightedness)?

  Q. 4. What is cataract?

 Q. 5. What do you mean by angle or deviation in prisim?

 Q. 6. What do you mean by scattering light or tyndall effect?

 Q. 7. Why does the sky appear dark instead of blue to an astronaut.

 Q. 8. What is presbyopia?

 Q. 9. How do us see colours?

 Q. 10. What is meant by the far point, near point and the least distance distinct vision?

 Q. 11. Why does it take some time to see to see object in a dim room when you enter the room from bright sunlight outside?

 Q. 12. A person with a defective eye-vision is unable to see the object nearer than 1.5m. He wants to read books at distance of 30 cm. Find the nature, focal length and power of the lens he needs in his spectacles?

 Q. 13. Why do the planets not appear twinkling like the stars?

 Q. 14. Why does the colour of sky appear blue?

 Q. 15. Why do the colour of sun appears red at sun-rise and sun-set?

 Q. 16. What is meant by saying that “potential difference between two points is one v (volt)”?

 Q. 17. Why are copper and aluminium wires usually used for electricity transmission?

Q. 18. Why is an ammeter likely to be burnt out if you connect in parallel?

 Q. 19.why is the series arrangement not found satisfactory for house lights?

 (B)why is the resistance of a given wire inversely proportional to its cross sectional area? 

Q. 20. A 40 watt lamp requires 0.182a of current at 220 volts, while a 6o watt lamp requires 0.272a of current at 220 volts line, how many amperes of current will flow through each lamp?

 Q. 21. Derive the formula for the heat generated by an electric current?

 Q. 22. Define and explain ohm’s law?

 Q. 23. Define electric power. Write s.i unit of electric power. Define it also. Derive the formula for electric power.

 Q. 24. Why are coils of electeric toasters and electric irons made of an alloy rather than a pure metal?

 Science (Physics) SS2

Q. 1. If a ray of light is incident on a plane mirror at an angle I, by what angle is it    deviated?

Q. 2. The refractive indices of glass of yellow, green and red color are uu, uq and ur. Rearrange these symbols in the increasing order of their values.

Q. 3. A girl in the mirror laughing house finds her face appearing highly magnified, lower portion of her body of the same size but laterally inverted and middle portion f her body highly diminished in size. Guess the design of the mirror?

Q. 4. How does a focal length of a convex lens changes if

A monochromatic red light is used instead of blue light?

It is placed in water?

Q. 5. Is it possible for a lens to act as a converging lens in one medium and a diverging lens in other? How?

Q. 6. An object is kept in front of a concave lens of focal length 15 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror?

Q. 7. An object is placed at a distance of one and a half of the focal length of a concave mirror. Find the position of the image in terms of f. Also find the magnification and nature of the image formed by the mirror.

Q. 8. A concave mirror produces three times magnified real image of an object, placed 10cm from it. Where is the image located?

Q. 9. The image of a needle placed at 45 cm from a lens is formed on a screen placed at 90 cm on the other side of the lens. Find the displacement of the image when the object is moved 5cm from the lens.

Q. 10. Where should an object be placed from a convex lens of f=20cm so as to obtain an Image of magnification 2.

Science (Physics)SS2

Q. 1. Draw the ray diagram for an object placed at 2F in front of convex mirror.
Q. 2. Explain the different types of energy that can be obtained from
oceans.

 Q. 3. What is the principle used in motors and discuss the role of split rings in electric motors.

 Q. 4. Magnification of object is –1 . What kind of spherical mirror is Used and what is position of the object.

 Q. 5. Hydrogen has been used as rocket fuel. Is it cleaner than CNG? why or why not.

 Q. 6. Explain the construction ,working ,advantages and disadvantages of using solar cooker with diagram.

 Q. 7. How has the traditional use of wind and water energy been modified for our convenience.

 Q. 8. Find the equivalent resistance between A and B and find current In 5 ohm resistance

 Q. 9. Why dispersion of light is found in case of prism and not in glass Slab. From the diagram give the number that corresponds to color Of danger signal. Why only that color is used as danger signal.

Q. 10. A convex lens has focal length of 50 cm. What is its power ? An object is kept at distance of 75 cm from this lens. Where Is the image formed ? How does size of image compare with that of object ?

Q. 11. Explain house hold wiring system with diagram. Explain the terms (a)over loading

 (b) short circuiting  (c) earthing (d)fuse           

Science (Biology)SS-2

Q. 1. explain double fertilization in plants?

Q. 2. what is the role of a catalyst in a chemical reaction?

Q. 3. what are isomers?

Q. 4. what is meant by 1 ohm?

Q. 5. write the chemical name and formula for plaster of paris?

Q. 6. What is meant by monohybrid and dihybrid cross?

Q. 7. state and explain ohm’s law.

Q. 8. state one limitation for the usage of hydro energy?

Q. 9. what is principle of electric motor?

Q. 10. why is DNA copying essential for reproduction?

Q. 11. What is meant by specition?

Q. 12. what is main function of nephron?

Q. 13. define rusting and rancidty?

Q. 14. state the functions of small intestine?

Q. 15. which class of compounds gives a positive fehling’s test?

Science (Periodic Classification of Elements)SS2

Q. 1. Name the scientist who tried to classify the elements in the group of triads.

 Q. 2. Define modern periodic law.

 Q. 3. How many groups and periods are present in modern periodic table?

 Q. 4. Define atomic size?

 Q. 5. Name two elements you would expect to show chemical reactions similar to magnesium. What is the basic of your choice?

 Q. 6. Nitrogen ‘n’ atomic number y and phosphorus (p) atomic number 15 belong to group 15 of the periodic table. Write the electronic configuration of these elements. Which of these two will be more electronegative? Why?

 Q. 7. Write the triads as formed by dobereiner?

 Q. 8. Define and explain mendeleev’s periodic law?

 Q. 9. Explain the limitation or demerits of mendeleev’s periodic table?

 Q. 10. Define and explain modern periodic law?

 Q. 11. Write the number of elements present in k, l and m shell periods of modern periodic table and give reason for it

Q. 12. An atom has electronic configuration 2, 8, 7What is the atomic number of this element?

To which of the following elements would it be chemically similar?

 Q. 13. How does the electronic configuration of an atom relate to its position the modern periodic table?

 Q. 14. Explain about the trends in modern periodic table, about various properties like valancy, atomic size, metallic and non-metallic properties of the atoms of element?

 Q. 15. What were the limitation of dobereiner’s classification?

 Q. 16.lithium sodium, potassium are all metals that eat with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

 Helium is an unreactive gas and neon is a gas of extremely low? Why?

 Q. 17. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

 Q. 18. In the modern periodic table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?

 Science (Carbon and its Compound)

Q. 1. What is a covalent bond?

Q. 2. Why are carbon compounds not able to conduct electricity through them?

Q. 3. What are fullerenes?

Q. 4. What are saturated hydro-carbons?

Q. 5. What are unsaturated hydro-carbons?

Q. 6. What are structural isomers?

Q. 7. Draw the structural fomulae of two isomers of butane?

Q. 8. What are alkanes?

Q. 9. What are alkenes?

Q. 10. What is homologous series?

Q. 11. Write the general scientific names of alcohols and carboxylic acids.

Q. 12. What are detergents?

Q. 13. What is hydrogenation?

Q. 14. Why carbon atoms can not form ionic bounds in the compounds?

Q. 15. Draw the structures of diamond and graphite?

Q. 16. What type of compound show addition reaction? Explain with an example.

Q. 17. Explain the cleaning action of soaps?

Q. 18. Differentiate between soap and detergents.

Q. 19. write important properties of ethanoic acid.

Q. 20. A mixture of oxyzen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

Q. 21. What are oxidizing agents?

 Science (Carbon and its compounds)  SS2

Q. 1. Name the functional group present in the compound CH3NH2 and name it. (1 mark)

 Q. 2. Write the name and chemical formula of the organic acid present in vinegar. (1 mark)

 Q. 3. A compound has molecular formula C2H6O. It is usable as a fuel. Name it. (1 mark)

 Q. 4. An organic compound A on heating with acetic acid and conc. Sulphuric acid gave a pleasant smelling compound B. What is the nature of compound A? (1 mark)

 Q. 5. How is ethanol prepared from ethane? Write the chemical equation for the reaction involved. What is meant by denatured alcohol? What is the need to denature alcohol? (2 marks)

 Q. 6. What is the unique property of carbon atom? How is this property helpful to us? (2 marks)

 Q. 7. Complete and balance the following equations: (2 marks)

 C2H5OH + O2Combustion

 C2H5OH+O2Oxidation

 C2H4 + H2OH3 PO 4 CH3COOH + CH3OH

Q. 8. An organic compound A of molecular formula C2H6O on oxidation gives an acid with the same number of carbon atoms as in the molecule A. Compound A is often used for sterilization of skin by doctors. Name the compound A and B. Write the chemical equation involved in the formation of B from A. (2 marks)

 Q. 9. Give reasons: (2 marks)

 Common salt (sodium chloride) is added during the preparation of soap., Soap is not suitable for washing clothes when the water is hard.

 Q. 10. Explain the nature of the covalent bond using the bond formation is CH3Cl. (3 marks)

 Q. 11. Write the chemical equation representing the preparation reaction of ethanol from ethane.

 Name the product obtained when ethanol is oxidized by either chromic anhydride or alkaline potassium permanganate. Give an example of an etherification reaction. (3 marks)

Q. 12.What are the two properties of carbon which lead to he formation of a large number of carbon compounds?What is a homologous series? Explain with an example. By how many carbon atoms and hydrogen atoms do any two adjacent homologous differ?Give a test that can be used to differentiate chemically between butter and cooking oil. (5 marks)  

Science (Chemistry)  SS2

Q. 1. What are Newland octaves. Give its drawbacks.

 Q. 2. What are differences between Mendleev’s and modern periodic tables?

 Q. 3. How many elements are there in 1st period?

 Q. 4. Name two elements which shows chemical charecteritics similar to mg?

 Q. 5. What are defects of Mendleev’s periodic table?

 Q. 6. On which factors the size of atoms depend? Explain?

 Q. 7. How the following changes in period?Metallic charecterics  ,valenc ,Electron affinity,Atomic radii

Q. 8. An element A with atomic no.14 and another B of atomic no. 17. Which one has :more metallic charactergreater atomic size .name one element having similar characteristics as element A and one as B.

Q. 9. Which among Cl, F,Br.and Iodine has largest atomic sizehighest reactivity

Q. 10. Why noble gasses are inert?

Q. 11. Scandium,Gallium and germanium are discovered later but Mendeleev,s left gaps for them.What name he gave these elements

Q. 12. What special names given to group 1 ,2, 17 & 18

Q. 13. Observe following table and answer following questions

Group16

 

 

Group17

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

B

 

 

C

 

 

 State whether A is metal or non metal,which is more reactive ? A or C.Will C be larger or smaller in size than B.which type of ion,cation or anion will be formed by A?

 Q. 14. elements X of atomic no. 12 and 13 , are taken. Give there group and period no. on basis modern table. Name:-three elements having 1 valence electron two elements having +ve valency 2

 Lithium , sodium ,potassium are metals that react with water to give hydrogen. What are similarity among atoms of these metals?

 Q. 15. Which element has two shells,both of which are completely filled the electronic configuration is 2, 8, 7(c)

 Q. 16.

  

 

 

1

 

 

2

 

 

3 to 12

 

 

13

 

 

14

 

 

15

 

 

16

 

 

17

 

 

18

 

 

2

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

C

 

 

3

 

 

 

 

 

D

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

 

 

 

 

F

 

 

Which element form only covalent compounds.

 which element is a metal with valency 2.

which element is nonmetal with valency of 3.out of D and E which one has a bigger atomic radius why?

 write a common name for the family of element C and F?

Science (Sources of Energy)SS1  

Q. 1. Why there is a need for energy?

Q. 2. Give some sources of energy?

Q. 3. Give the main categories of source of energy?

Q. 4. Which of the following are renewable and which are non-renewable sources of energy:
Coal, wind, tides, sun, petrol, bio-mass, cng, hydro-energy

Q. 5. What is solar energy?

Q. 6. Which part of the sun’s energy is responsible for drying clothes?

Q. 7. Which component of the sun’s energy responsinle for skin cancer?

Q. 8. What are semi-conductors?

Q. 9. Define ocean thermal energy?

Q. 10. define geothermal energy?

Q. 11. Define bio-mass? Give its three examples.

Q. 12. Define anaerobic degradation?

Q. 13. Explain why a reflector is used in a solar cooker?

Q. 14. What causes a wind to blow?

Q. 15. Define solar constant?

Q. 16. Explain how the high temperature is maintained inside a solar cooker?

Q. 17. Distinguish between renewable and non-renewable sources of energy?

Q. 18. What is the use of black painted surface in solar heating device?

Q. 19. Charcoal is better fuel than wood and coal, still its use is discouraged. Why?

Q. 20. Why is bio-gas a better fuel animal dung-cakes?

Q. 21. Why is sun called the ultimate source of fossible fuels?

Q. 22. Write a short note on ‘green house effect’?

Q. 23. What are the advantages of nuclear energy?

Q. 24. Why are we looking for alternate source of energy?

Q. 25. Define bio-degradable wastes?

Q. 26. What protects us from the harmful effect of ultra violent rays of the sun?

Q. 27. Define food wed?

Q. 28. Define producers and consumers and give their examples?

Q. 29. Why do we say that flow of energy in the ecosystem is undirectional?

Q. 30. What will happen if we kill all organisms of one tropic level of food chain?

Q. 31. What is ganga action plan?

Q. 32. Define sustainable development?

Q. 33. What is the main aim of the conservation of forests?

Q. 34. Who are stakeholders?

Q. 35. What do you mean by water harvesting?

Q. 36. What do you mean by chipko movement?

Q. 37. Why do you think their should be eqitable distribution of resources?

Science (Magnetic Effects of Electric Current) SS1

Q. 1. What is a magnetic fields?

Q. 2. What are the magnetic lines of force?

Q. 3. What is an electric motor?

Q. 4. What is a solenoid?

Q. 5. Which effect of electric current is untilized in the working of an electric motor?

Q. 6. What is the frequency for a.c (altemating current) in india?

Q. 7. On what principle is an a.c generator based?

Q. 8. Why don’t two magnetic lines of force interest each other?

Q. 9. Name some source of direct current?

Q. 10. When does an electric short circuit occur?

Q. 11. What is the usual colour code followed for connecting ive, neutral and earth wires. Why is it so important?

Q. 12. What is electromagnetic inductions?

Q. 13. State the rule to determine the direction of magnetic field produced around a current carrying conductor?

Q. 14. What is the role of a fuse in the electric circuits?

Q. 15. Explain direct and alternating current?

Q. 16. What is the function of an earth wire? Why is it necessary to earth metallic appliances?

Q. 17. Draw magnetic field lines around a bar magnet?

Q. 18. Why does a compass needle get deflected brought near a bar magnet?

Q. 19. List the properties of magnetic lines of force?

Q. 20. What is the principle of an electric motor?

Q. 21. State the principle of an electric generator.

Q. 22. Two circular coils a and b are placed closed to each other. If the current in coil a is changed, will some current be induced in the coil b? Give reason.

  

Science (Physics)SS1

Q. 1. Name one main ore of aluminium.

Q. 2. Why carbon tetrachloride (CC14) does not conduct electricity?

Q. 3. Which group of elements was missing in Mendeleev's Periodic Table?

Q. 4. State one point of similarity between the human eye and the camera.

Q. 5. The path of a beam of light passing through a true solution is not visible. Why?

Q. 6. The elements A, B and C are present in the same period of Periodic Table. Their atomic radii are 172 pm; 106 pm and 136 pm, respectively. Arrange these elements in increasing order of their atomic number in the period. 

Q. 7. What type of bond is present in water molecule? Explain the formation of bonds between hydrogen and Oxygen to form water molecule.

Q. 8. How many electrons are associated with (i) one coulomb of charge? (ii) The flow of current of 16 mA for 100 s? (Given: charge of electron = 1.6 x 1019 C)

 Q. 9. Two 'set-ups' are shown below: What are we likely to observe if the (i) Magnet in set-up (A) is kept stationary within the coil? (if) Key in set-up (B) is just 'plugged-in’? 

Q. 10. Draw the pattern of the field lines of the magnetic field produced by a current carrying Straight wire,circular coil,solenoid

 Q. 11. How many 440 Q resistors should be connected in parallel to draw a total current of 10 A on a 220 V line?

 Q. 12. Discuss the reaction of sodium, magnesium, iron and gold with water.

 Q. 13. (i) Give an example of the reaction between a non-metal oxide and sodium hydroxide. Write the balanced chemical equation also.

 (ii) The pH of a solution is 4.8. What is its nature and what will be its action on blue litmus

 Q. 14. The image, formed by a concave mirror, is observed to be :-virtual, erect and larger than the object. ,Real, inverted and larger than the object.,Real, inverted and of the same size as the object , Real, inverted and smaller than the object.
Where is the position of the object in each of these cases? Draw ray-diagrams to justify your choices
for cases (I) and (III). Or 

A beam of white light is made to fall on the three set-ups shown here.What are we likely to observe in each of these three cases ? How can we understand the similarity in the observations of cases(I) and (III)?
Name the seven colours linked with the observation in case (II) for sunlight

 Q. 15. Write a reaction in which a gas is evolved.

 What are oxidation-reduction reactions? Write the reaction of copper oxide with hydrogen and
identify the species which is reduced.

 What is rancidity?           Or

 Q How are chemical reactions classified? Describe the various types of reactions with the help of an example in each case.

 Science (Physics)SS1

Q. 1. What is the shape of V-I graph for an ohmic resistance?

Q. 2. Why does a compass needle get deflected when brought near a bar magnet?

Q. 3. The image formed by a convex lens is always real. Is it true?

Q. 4. A concave mirror produces two times magnified real image of an object placed at 10 cm infront of it. Where is the image located?

Q. 5. Name two energy sources that you would consider to be renewable. Give reasons for your choices.

Q. 6. Will current flow more easily through a thick wire or thin wire of the same material when connected to the same source? Why?

Q. 7. Name two safety measures commonly used in electrical circuits and appliances. An electric oven of a 2 kw power rating is operated in a domestic circuit (220V) that has a current rating of 5 A. What result do you expect? Explain.

Q. 8. Show how will you connect three resistors, each of resistance 6 ohm, so that the combination has a resistance of (i) 9 ohm (ii) 2 ohm. Justify your answer.

Q. 9. What is myopia? List two causes for the development of myopia. Describe with ray diagrams, how this defect may be corrected by using spectacles.

Science (Physics)SS1

Q. 1. Which is bigger, a coulomb or charge on an electron? How many electric charges form one coulomb of charge?

Q. 2. A plastic comb run through ones dry hair attracts small bits of paper. Why? What happens if the hair is wet or if it raining?

Q. 3. What is an electric lines of force? What is its importance?

Q. 4. An ebonite rod held in hand can be charged by rubbing with flannel but a copper rod can’t be charged like this. Why?

Q. 5. What is the value of charge on an electron in S.I unit? Is a charge less than this value possible?

Q. 6. Define and explain quantisation of electric charge.

Q. 7. If a body gives out 109 electrons every second. How much time is required to get a total charge of 1C for of 1C from it? [Ans: - 198.2 year ]

Q. 8. A polythene piece rubbed with wool is found to have negative charge of 3.2 x 10-7C. Calculate the number of electrons transferred.

Q. 9. How is static electricity is different from current electricity?

Q. 10. Define current electricity. What do you mean by condition electrons?

Q. 11. Define electric current. “It has both direction as well as magnitude”, than why it is a scalar?

Q. 12. What is the current flowing through a conductor if one million electrons are crossing in 1 millisecond through a cross-section of it?

Q. 13. A wire is carrying a current. Is it charged?

Q. 14. A large number of free electrons are present in metals. Why is there no current in the absence of electric field across it?

Q. 15. When we switch on an electric bulb, it light almost instantaneously, though drift velocity of electron in wires is very small. Explain.

Q. 16. Define one example, one volt of potential energy.

Q. 17. A wire having resistance R is stretched so as to reduce it’s diameter to half of its previous value, what will be it’s new resistance?

Q. 18. What will be change in resistance of a Eureka Wire, when its radius is halved and length is reduces to one-forth of its original length? Explain why an electric bulb becomes dim when an electric heater in parallel circuit is made on. Why dimness decreases after some time?

Q. 19. Long distance power transmission is carried on high voltage lines. Why?

Q. 20. Which lamp has greater resistance a: 60w or 100w lamp, when connected to the same supply?

Q. 21. A wire of resistance 4R is bent in the form of circle. What is the effective resistance between ends of diameter?

Q. 22. A wire of resistivety ζ is stretched to three times to length. What will be its new resistivety? 

Q. 23. Bends in a pipe slow down the flow of water through it. Do bends in a wire increase its electrical resistance?

Q. 24. The V-I graph for conductor makes angle with V-axis. Here V denotes voltage and I denote current. What is the resistance of this conductor? [Ans: R = cot ]

Q. 25. What are the factors on which the resistance of a conductor depends? Give the corresponding relation.

Q. 26. To reduce the brightness of a light bulb, should an auxiliary resistance be connected in series with it or in parallel?

Q. 27. Current is allowed to flow in a metallic wire at a constant potential difference. When the wire becomes hot, cold water is poured on half of its portion. By doing so, its other becomes still more hot. Explain its reason.

 Q. 28. What is super-conductivity? Write its two application.

 Q. 29. Prove that in parallel combination of electrical applications, total power consumption is equal to the sum of the powers of the individual appliances.

 Q. 30. A current in a circuit having constant resistance is tripled. How does this effect the power dissipation?

 Q. 31. A wire connected to a bulb glows when same current flows through them. Why?

 Q. 32. Nichrome and cupper wires of the same length and diameter are connected in series in the electric circuit in which wire, the heat will be produced at higher rate? Explain.

 Q. 33. Draw V-I graph for an Ohmic and Non-Ohmic material. Give one example for each.

 Q. 34. How does the resistivety of Conductor and,A semiconductor vary with temperature? Give reasons for each.

Q. 35. There is an impression among many people that a person touching a high power line gets stuck with the line. Is that true? Explain.

 Q. 36. Explain why an electric bulb becomes dim when an electric heater in parallel circuit is made on. Why dimness decreases after some time?

 Q. 37. Long distance power transmission is carried on high voltage lines. Why?  

Science (Numericals on Current Electricity) SS1

Numericals on Current Electricity

Q. 1. Find the work done by an electron to maintain the potential difference of 80V?

Q. 2. What is the potential difference between the ends of 16Ω resistance, when a current of 1.5A flows through it?

Q. 3. The potential difference across the the terminals of an electric iron is 240V and the current is 6 A what is the resistance of electric iron?

Q. 4. If there are 108 electrons flowing across any cross section of a wire in 4 minutes, what is the current in the wire?

Q. 5. .A copper wire has diameter o.5mm and resistivity 1.6 x 10-8 ohm m what will be the length of this wire to make the resistance of 10 ohms?

Q. 6. Find the effective resistance of resistors 0.01 ohms and 107 ohms.in series and parallel

Q. 7. Two resistors of same materials has been connected in series first and then in parallel. Draw a V – I graph to distinguish these connection.

Q. 8. Three resistors 3,4,5 ohms are joined in parallel in a circuit. If a current of 150 mA=150×10-3A flows through the resistor of 4 ohms, then find the values of the current in mA which will be flowing in other two resistors?

Q. 9. A wire of length 2cm having resistance R is stretched to have an increase of 100% of original length . Find its new resistance with respect to its original resistance.

Q. 10. An electric lamp has resistance of 400 ohms. It is connected to a supply of 250V. If the price of electric energy is Rs.1.20 per unit, calculate the cost of lighting the lamp for 20 hours.  

Science (Physics)

Q. 1. Name a device that helps to maintain the potential difference across a conductor

Q. 2. Why ammeter is connected in series whereas voltameter is connected in parallel through a circuit?

Q. 3. Name the material used as filament in heater and electric bulb.

Q. 4. The p.d. between the terminals of an electric heater is 60v when it draws a current of 4A from a source.What current will the heater draw if p.d is increased to 120v.

Q. 5. What are difference between resistivity and resistance?

Q. 6. If resistance of a device kept constant and p.d decreases to half , what will be effect on its current?

Q. 7. Why are coils of heating appliances are made of alloys rather than metals?

Q. 8. What is variable resistance?

Q. 9. Why rheostat is used?

Q. 10. R1 , R2 & R3 are three resisters connected in series . derive equivalent resistance for circuit. If value of two resistance are 10 ohm and 20ohm , and a current of 5A flow through circuit having p.d 12v , find value of third resistor if all 3 are connected in parallel

Q. 11. What are advantages of connecting electrical device in parallelwith the batteries instead of series?

Q. 12. State joule’ s law. An electric iron consumes energy at rate of 840w when heating is at maximum rate and 360 w when heating is at minimum.The voltage is 220v . what are the current and resistant in each case?

Q. 13. Why inert gas such as nitrogen , filled in electric filament?

Q. 14. What is fuse? What type of material should be used for it?Give the rating of fuse for a device marked as 1000w –220v.

Q. 15. What is commercial unit of electrical energy? Express it in joule.

Q. 16. For resistors of equal values are connected through p.d 220v and carry current of 5A . Find values of each resistors.

Q. 17. Why we should not connect a bulb and a heater in series ?

Q. 18. What is electric power? Give its SI unit.

Q. 19. Why aluminium and copper wires generally used for transmission of current?

Q. 20. Why high tension wires are used for long distance transmission?

Q. 21. Why does a compass needle get deflected when brought near bar magnet?

Q. 22. Define magnetic field lines . what is direction of magnetic field lines inside magnet?

Q. 23. How the relative strength of magnet is expressed?

Q. 24. What will be effect in deflection of needle if (a) current in solenoid will be changed (b) magnitude of current will increase.

Q. 25. If an electron enters in magnetic field from west direction , how will it deflect?

Q. 26. List the properties of magnetic field lines.

Q. 27. Why don’t two magnetic field intersect each other?

 Q. 28. The magnetic field in a given region is uniform . Draw a diagram to represent it.

 Q. 29. A alfa particle projected towards west is deflected towards north by a magnetic field.What is the direction of magnetic field?

 Q. 30. What is MRI?

 Q. 31. Name two organs inside our body where magnetic field produced?

 Q. 32. What is electric motor? On which principle it work? Name two device in which it is used.

 Q. 33. State Fleming left hand rule.

 Q. 34. What is commutator?

 Q. 35. What is armature? How electromagnet is more advantageous than a permanent magnet?

 Q. 36. What is electro magnetic induction?

 Q. 37. Give two ways to induce current in a coil

 Q. 38. What are differences between AC & DC?

 Q. 39. After what times AC changes its direction ? give frequency of current produced in india.

 Q. 40. What is dynamo? On which principle it work?

 Q. 41. What modification should do to get DC from AC generator?

 Q. 42. What precaution should be taken to avoid the overloading of domestic circuits?

 Q. 43. What is short circuits? When it occurs?

 Q. 44. What is function of earth wire? Why it is necessary to earth a metallic appliance?

 Q. 45. Give three methods of producing magnetic field.

 Science (Chemistry)SS1

Q. 1. Write the chemical formula of marble.

Q. 2. Why silver chloride (AgCl) turns grey in sunlight?

Q. 3. Differenciate between displacement and double displacement reactions.

Q. 4. State Modern periodic law.

Q. 5. Why atomic size decreases on moving from left to right along a period?

Q. 6. What is meant by reactivity series of metals? Will the following reaction take place? 3MnO2 (s) +4Al ----> 3Mn(l) +Al2O3(s) + heat

Q. 7. What is used as anode and cathode in electrolytic refining of metals?

Q. 8. .What is the relation between butane and 2-methyl propane?

Q. 9. Explain esterification reaction with example. How is Saponification related to it?

Q. 10. What is denatured alcohol?What causes blindness if it is consumed?

Q. 11. Write one use of ethanol and methanol each.

Q. 12. Write homologous series of alkene up to 5 carbon compound.

Q. 13. What is catenation?

Science (Metals and Non-Metals)SS1

Q. 1. Give an example of metal which:Is liquid at room temperature?Can be easily cut with knife

 Q. 2. Give an example of a metal which:Is the best conductor of heat,Is a poorest conductor of heat

 Q. 3. Explain the meaning of malleable and ductile?

 Q. 4. What are amphoteric oxides?

 Q. 5. Give example of two amphoteric oxides?

 Q. 6. What is anodizing?

 Q. 7. What happens when metal react with water?

 Q. 8. What happens when metals react with dilute acid? Give one example.

 Q. 9. What is the reactivity series of metals?

 Q. 10. Why is sodium or potassium metals kept immersed in kerosene oil?

 Q. 11. Define minerals and ores?

 Q. 12. What is the basis of removal of the ore?

 Q. 13. What is roasting?

 Q. 14. What is calcination?

 Q. 15. What is an amalgam?

 Q. 16. Why are foodcans coated with tin metal and not zinc metal?

Q. 17. State two ways to prevent the rusting of iron?

 Q. 18. What types of oxides are formed when non metals combine with oxygen?

 Q. 19. Differentiate between metals and non-metals on the basis of their physical properties?

 Q. 20. Explain the refining of impure copper metal?

 Q. 21. Write an activity to show that ionic compounds are good conductors of electric current in their aqueous solution?

 Science (Acids, Bases and Salts)SS1

Q. 1. W hat are acids?

Q. 2. What are bases?

Q. 3. What happens when sodium hydrogen carbonate reacts with dilute hcl acid?

Q. 4. What is the colour phenolphthalein indicator in an acidic solution say in dilute hcl or dilute hydrogen sulphide acid?

Q. 5. Name some natural resourses of acids and name the acids present in them?

Q. 6. Name some materials which are made from common salt (nacl, sodium chloride).

Q. 7. Write chemical fomulae of the following salts:
washing soda, baking soda and bleaching powder.

Q. 8. What do you mean by water of crystallisation?

Q. 9. Write chemical fomulae of gypsum and plaster of paris. Also write their chemical names.

Q. 10. Write some important chemical properties of acid?

Q. 11. Write some important chemical properties of bases?

Q. 12. How is baking soda produced? Write some uses of their compound?

Q. 13. How is washing soda produced?

Q. 14. How is plaster of paris prepared? Write some of its important uses.

Q. 15. Write an activity to show the reaction of acid with metal carbonates and metal hydrogen carbonate salts.

Q. 16. Why should curd and sour substances not be kept in brass and copper vessels?

Science (Chemical Reaction & Equations) SS1 =+ 2

Q. 1. What is chemical reaction?

 Q. 2. Which substance is used for white-washing the walls?

 Q. 3. What are exothermic reactions? Give one example also?

 Q. 4. Name four types of chemical reactions?

 Q. 5. What are combination reactions?

 Q. 6. Give two example of combination reaction?

 Q. 7. What are displacement reactions?

 Q. 8. What are double displacemwent reactions?

 Q. 9. What are oxidation reactions?

 Q. 10. What are reduction reactions?

 Q. 11. What is rancidity?

 Q. 12. Why do we apply paint on iron articles?

 Q. 13. What do you mean by precipitation reaction? Give its one example.

 Q. 14. What is redox reactions? Give its two examples?

 Q. 15. Write the balanced chemical equation of the following and identify the type of reaction in each case:Potassium bromide(aq) = barium iodide(aq) -> potassium iodide(aq) = barium bromide(s)

Zinc carbonate(s) -> zinc oxide(s) = carbon dioxide(g)

Magnesium(s) = hydrochloric acid(aq) -> magnesium chloride(aq) = hydrogen(g)

Q. 16. Wrte an activity to shw the change in the state of matter and change in temperature during a chemical reaction (change).

 Q. 17. Write an activity to show the electrolysis of water, as an example of decomposition reaction

Q. 18. Name different types of chemical reaction? Define them and give their example?

 Q. 19. What does the colour of copper sulphate solution change when an iron dipped in it?

 Science

Q.1. What is meant by thermal decomposition?

 Q.2. Name the group of chemical substances used to prevent oxidation.

 Q.3. What is the nature of oxides formed by metals and non metals?

 Q.4. Name one cheap reducing agent commonly used in extraction of pure metals.

 Q.5. Define catenation.

Q.6. Name the gas evolved when sodium carbonate or sodium bicarbonate reacts with ethanoic acid?

 Q.7. Name the cells which regulate the opening and closing of stomata.

 Q.8. Name the enzyme responsible for changing starch to sugar in mouth.

 Q.9. What is scum?

 Q.10. Which type of flame is produced by saturated hydrocarbons on incomplete combustion?

 Q.11. What happens when calcium oxide reacts with water? Write the chemical equation of reaction involved.

 Q.12. Respiration is considered an exothermic reaction. Explain?

 Q.13. Give reason:- Ionic compounds conduct electricity only in molten state not in solid state.

 Q.14. Explain why:-

Aluminium is more reactive than Iron, yet its corrosion is less than Iron.

Carbonate and sulphide ores are usually converted into oxides before reduction during process of e extraction.

Q.15. What is hydrogenation? Write its industrial application.

 Q.16. Write the common name of ethanoic acid. What is its ditute solution (5-8%) in water known as?

 Q.17. Write the functions of muscular wall in digestive tract.

 Q.18. Why danger signals are red?

 Q.19. Explain the phenomenon which causes twinkling of star.

 Q. 20. An object of 4cm height is placed at a distance of 15cm away from a convex lens of focal length 10cm.Find the nature, size, position of the object. Find its magnification.

Q. 21. Draw and explain the ray diagram formed by a convex mirror when object is at infinity.object is at finite distance from the mirror.

 Q. 22. Name three refractive defects of vision with the help of diagram. Explain the reasons and correction of these d defects.

 Q. 23. Describe the urine formation in human beings. Draw a neat and labelled diagram of nephron.

 Q. 24. What are soaps? Explain the mechanism of the cleaning action of soaps? Soaps form scum (insoluble s substance) with hard water. Explain why? How this problem is overcome by use of detergents?

 Q. 25. What are ionic compounds. State four properties of ionic compounds in respect to their physical nature, melting and boiling points, solubility and conduction of electricity?

 Science SS-1

Q. 1. HC1 and HNO3 both produce hydrogen ions in aqueous state. With metals they produce hydrogen gas. However, as HNO3 is a strong oxidising agent, it reacts with the hydrogen gas so produced during the reaction to form water. Thus, acids such as HC1, H2SO4 produce hydrogen gas with metals whereas, HN03 produce water.

 Q. 2.

 Minerals

 

 

Ores

 

 

Gangue

 

 

Substances that occur naturally in rocks and have their own characteristic appearance and chemical composition .

 

 

Minerals, from which the metals can be profitably extracted, are called ores.

 

 

Waste materials, which are mixed in the valuable ores.

 

 

All minerals are not ores.

 

 

All ores are minerals.

 

 

 

 

 

Q. 3. Metal A is Zn.

 It reacts with blue copper sulphate to form colourless zinc sulphate.
Zn(s)+CuSO4 (aq)→ ZnSO4 (aq)+Cu(s)↓
Copper sulphate    zinc sulphate                   (Brown)
  (Blue)                 (Colourless)   
It reacts with green iron sulphate to produce colourless zinc sulphate.
Zn(s)+FeSO4 (aq)→ZnSO4 (aq)+Cu(s)↓
        Ferrous sulphate          zinc sulphate     (Brown)
             (Green)                    (Colourless)     
Zn does not react with aluminium hydroxide, as Zn is less reactive than Al, hence it cannot displace it.

 

Q. 4. Highly reactive elements are obtained by the electrolysis of their molten chlorides. The metals are deposited at the cathode, whereas, chlorine is liberated at the anode. In the case of sodium chloride, the reactions are: At cathode, Na+ + e- → Na At anode, 2Cl- → Cl2 + 2e- Similarly, aluminium is obtained by the electrolytic reduction of aluminium oxide. Carbon cannot be used for the reduction of highly reactive metals because these metals have more affinity for oxygen than carbon. These metals are obtained by electrolytic reduction.

Q. 5. http://www.cbseguess.com/papers/cbse_important_questions/x/2010/images/science_27_clip_image002_0000.jpgElectrolytic refining is the process of obtaining metals of very high purity by depositing the desired metal and the impure metal on different electrodes in an electrolytic cell. Metal obtained after reduction are not very pure, so they need to be refined further. The most widely used method is electrolytic refining. For example, in the electrolytic refining of copper, CuSO, is acidified (to make it highly conducting) and is used as electrolyte. The anode is made of thick impure copper rod, whereas the cathode is made of thin pure copper. Anode is connected to positive terminal of the battery whereas cathode is connected to the negative terminal of the battery. Pure metal is obtained at cathode.

 Q. 6. Corrosion is the wearing away, dissolving, or softening of any substance which takes place due to chemical or electrochemical reaction with its environment. It applies to the gradual action of natural agents, such as air or salt water, on metals. It is rather a slow process. Four methods used to prevent from corrosion are:

Painting, Oiling or Greasing: It protects the metal from corrosion by forming a layer, which cuts off the exposure to moisture and air.

Anodising: Process of coating a metal, e.g., aluminium, with a protective or decorative oxide by making the metal the anode of an electrolytic cell .

Galvanising: It is a method of depositing a thin layer of zinc over steel and iron objects. The galvanised articles remain protected even if zinc coating; .s broken.

 

Alloying: Most of the metals are used as alloys—that is, mixtures of several elements—because these are superior to pure metals in their properties and uses. Alloying is done for many reasons. It helps in increasing strength, making articles corrosion resistance, or reduce costs.

Science

Q. 1. Name the following:

 Two renewable sources of energy (non - conventional) 2

 Two non-renewable or conventional sources of energy

 Two forms of energy usually used at homes

  The radiation emitted from a hot source

0The component of sunlight that is absorbed by the ozone layer of the atmosphere.

 Two activities in our daily life in which solar energy is used [Born on January 17, 1706]

 The kind of surface that absorbs maximum heat

 The device that directly converts solar energy into electrical energy

 The range of temperature attained inside a box-type solar cooker placed in the sun for 2-3 hours

 The two elements which are used to fabricate solar cells

 Q. 2. State an important characteristic of a source of energy.

 Q. 3. Which component of sun's energy is responsible for drying clothes?

 Q. 4. What type of energy is possessed by wind?

 Q. 5. Though a hot iron emits radiations, it is not visible to us. Why?

 Q. 6. What type of radiations is emitted by a 100 W electric bulb?

 Q. 7. How is the conductivity of a semi-conductor affected when light falls on it?

 Q. 8. What is the main cause for winds to blow?

 Q. 9. What is the minimum wind speed required for generating electricity in a wind mill?

 Q. 10. What is a wind farm?

 Q. 11. What is the principle involved in the working of the thermal power plant?

 Q. 12. What is the energy conversion involved in a thermal power plant?

 Q. 13. What is Biomass?

 Q. 14. What is biogas?

 Q. 15. Write the principle of the windmill?

 Q. 16. What are hot spots?

 Q. 17. What is nuclear fission reaction?

 Q. 18. A sheet of glass is used in solar heating devices. Why?

 Q. 19. Explain the construction and working of a hydro-electric power plant with a neat schematic diagram.

Q. 20. Give two main differences between renewable and non-renewable sources of energy.

Science (Life Processes)SS1

Very short and short answer type questions: 1 mark and 2 marks each  

Q. 1. What are nutrients?

 Q. 2. Name the life process that provides energy.

 Q. 3. Which process provides all living things with raw materials for energy and growth?

 Q. 4. Name the essential pigment that absorbs light.

 Q. 5. Can you name the gaseous raw material of photosynthesis?

 Q. 6. If grana of a chloroplast are removed then, which of the reaction of will not be carried out?

 Q. 7. Name the gas that is produced as a by-product during photosynthesis.

 Q. 8. The function of salivary amylase is to convert  Fats into fatty acids.Proteins into amino acids.

Starch into sugar. Sugar into starch 

Q. 9. Artificial removal of nitrogenous wastes from the human body in the event of kidney failure is 

Plasmolysis ,Dialysis ,Diffusion ,Osmosis

Q. 10. Tick the correct statement.

Arteries carry blood away from the heart while veins carry blood towards heart.

Veins carry blood away from the heart while arteries carry blood towards heart. 

Both of them carry blood in the same direction.

Either of them can carry blood away from the blood. 

Q. 11. Name the pore through which gaseous exchange takes place in older stems. 

Q. 12. Why the blood is red ? 

Q. 13. What is the functional unit of kidney? 

 Q. 14. Define translocation. 

Q. 15. Name the vessel that brings oxygenated blood from lungs to heart.

Q. 16. Why the colour of lymph is yellow?

Q. 17. Name the reagent which is used to test the presence of starch.

Q. 18. Why walls of articles are thinner than ventricles?

Q. 19. The mode of nutrition in which digestive enzymes are secreted out side the body.

Q. 20. What is ATP?

Short answer type questions 2 marks

Q. 21. Why is the rate of breathing in terrestrial animals slower than aquatic animals?

Q. 22. The parts shown as A and B in the given diagram are

  The parts shown as A and B in the given diagram are

  A) A is epidermal cell, B is stomatal pore
  B) A is guard cell, B is stomatal pore
  C) A is epidermal cell, B is guard cell
  D) A is guard cells, B is epidermal cell

Q. 23. Which activity is illustrated in the diagram of an Amoeba shown below?  

Q. 24. The diagram below represents urinary system in the human body. Identify the structure through which urine leaves the urinary bladder.

 Q. 25. A student covered a leaf from a destarched plant with a black paper strip and kept it in the garden outside his house in fresh air. In the evening, he tested the covered portion of the leaf for presence of starch. What the student was trying to show? Comment.

    QUESTIONS  OF LIFE PROCESSES  SS1

Q. 1. Name the product and by product of photosynthesis.
Q. 2. In which biochemical form the photosynthate moves in phloem tissue?

Q. 3. What are the raw materials of photosynthesis?
Q. 4. What is the similarity between chlorophyll and hemoglobin?
Q. 5. Name the products of photolysis of water.
Q. 6. What are the end products of light dependant reaction?
Q. 7. Which cell organelle is the site of photosynthesis?
Q. 8. What is the difference between digestion of heterotrophs and saprotrophs?
Q. 9. Give example of two plants and two animal parasites.
Q. 10. Name the enzyme present in saliva, what is its role in digestion?
Q. 11. Which chemical is used to test for starch? Which colour shows the presence of starch?
Q. 12. Give the term- rhythmic contraction of alimentary canal muscle to propel food.
Q. 13. Name the three secretions of gastric glands.
Q. 14. What is the function of mucus in gastric gland?
Q. 15. Name the sphincter which regulates the exit of food from the stomach.
Q. 16. Give the functions of hydrochloric acid for the body.
Q. 17. What is the role of pepsin in stomach?
Q. 18. Why pancreas is called mixed gland?
Q. 19. Give two functions of bile juice, from which organ it is released?
Q. 20. Name the largest gland of our body.
Q. 21. Name any three important enzymes of pancreas and the food component on which they act.
Q. 22. Where from intestinal juice come to the small intestine?
Q. 23. What is the function of intestinal juice?
Q. 24. What are the simplest digestive product of carbohydrate, fats and protein?
Q. 25. Name the finger like projections of small intestine and what is the necessity of such type of projections in digestive system?
Q. 26. Why are intestinal villis highly vascular?

Q. 27. What is the function of anal sphincter?
Q. 28. Name the site of anaerobic and aerobic respiration in a cell.
Q. 29. A three carbon compound is the common product of both aerobic and anaerobic pathway. What is that?
Q. 30. Why do we get muscle cramp after vigorous exercise?
Q. 31. Distinguish between lactic acid and alcoholic fermentation?
Q. 32. Name the energy currency molecule of cell?
Q. 33. The breathing rate of aquatic animals is high, why?
Q. 34. What is the function of mucus and fine hair in nostrils?
Q. 35. Give the function of network of capillaries on alveoli.
Q. 36. Name the main carrier of oxygen and carbon dioxide in man.
Q. 37. Why does haemoglobin molecule act as efficient carrier of oxygen than diffusion process?
Q. 38. Give example of any three substances transported by plasma.
Q. 39. Name the organ that- (a) pushes blood around body (b) make blood to reach to tissues.
Q. 40. Name the blood vessel that carries blood from heart to lungs and from lungs to heart.
Q. 41. How many heart chambers are there in (a) fish (b) frog (c) lizard (d) crocodile (e) birds (f) man?
Q. 42. Name the device that measures blood pressure.
Q. 43. What is the normal blood pressure of man?
Q. 44. Why capillaries are thin walled?
Q. 45. Which cell of blood help in wound healing?
Q. 46. What is the other name of lymph?
Q. 47. Give two function of lymph.
Q. 48. .What is the direction of flow of water in xylem and food in phloem?
Q. 49. Why do plants need less energy than animals?
Q. 50. Which process acts as suction to pull water from xylem cells of roots.
Q. 51. Mention two functions of transpiration.
Q. 52. What are the two substances transported through phloem tissue?

Q. 53. Name the food component whose digestion produce nitrogenous waste?
Q. 54. Which is the functional unit of kidney?
Q. 55. What is the cup shaped structure of nephron called?
Q. 56. Which materials are selectively reabsorbed by nephron tubule?
Q. 57. What are the two important functions of kidney.
Q. 58. What is the other name of artificial kidney?

 MULTIPLE CHOICE QUESTIONS

 Q. 1. A key molecule NOT found in a chloroplast is...

1. Chlorophyll 2.Carbon dioxide3. Water 4.Steroids

Q. 2. Photosynthesis is a good example of...1Catabolism2 Anabolism

Q. 3. Chloroplasts are found in heterotrophic cells. 1 True  2False 

Q. 4. Which of these choices is NOT in the structure of a chloroplast?

 1Granum2 Stroma3 Cristae4 Thylakoid

  Q. 5. Only plants can conduct photosynthesis with chloroplasts.1True  2.False

Q. 6. Chloroplasts convert solar energy into physical energy 1True2 False

 Q. 7. There is only one type of chlorophyll found in chloroplasts.1True2 False

 Q. 8. Because plants have chloroplasts to generate glucose, they are self-sufficient.1True2 False

Q. 8. A chloroplast is made of cellulose.1True2 False

Science (Life Processes)  SS1+2

Q. 1. What are life processes?

Q. 2. What outside raw materials, are used for life by an organism?

Q. 3. What are enzymes?

Q. 4. Explain the action of saliva secreted from salivary glands on the food?

Q. 5. Name the common process, both in the aerobic and anaerobic respirations?

Q. 6. Name the products produced by the fermentation of glucose by the yeast cell?

Q. 7. Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

Q. 8. Name the functional unit of human kidney?

Q. 9. The xylem in plants is responsible for __________.

Q. 10. Define photosynthesis?

Q. 11. What substances are contained in the gastric juice? What are their function?

Q. 12. What are the various processes that take place in the duodenum?

Q. 13. What the different types of hetrotropic nutrition?

Q. 14. Show by experiment that sunlight is necessary for photosyntheses?

Q. 15. Name the type of resperation in which the end products are: _______________.

Q. 16. Describe the process of anaerobic resperation?

Q. 17. Distinguish between breathing and respiration?

Q. 18. Differentiate between artery and vein?

Q. 19. Give examples of solid, liquid and gaseous wastes in plants?

Q. 20. Explain the nutrition process in amoeba?

Q. 21. Write important functions of blood?

Q. 22. Describe double circulation in human beings. Why is it necessary?

Q. 23. Compare the functioning of an alveolie in lungs and nephrons in the kidneys with respect to their structure and functioning?

Q. 24. Explain the mechanism of the circulation of blood in human body?

Q. 25. What criteria do we use to decide wheather something is alive?

Q. 26. What is the role of acid in our stomach?

Q. 27. How is oxygen and carbon dioxidetransported in human beings?

Q. 28. What are the component of the transport system in human beings? What are the functional of these components?

Q. 29. What are the components of the transport system in highly organised plants?

Q. 30. Describe the structure and functioning of nephrons?

Q. 31. How is the amount of urine produced regulated?

Q. 32. What is the role of saliva in the digestion of food?

Science

Q. 1. why is dna copying essential for reproduction?

Q. 2. what is the role of a catalyst in a chemical reaction?

Q. 3. which class of compounds gives a positibve fehling’s test? Ans:aldehydes

Q. 4. what is meant by 1 volt?

Q. 5. write the chemical name and formula for bleaching powder?

Q. 6. What is meant by dehydrating agent?

Q. 7. state ohm’s law.draw a schematic diagram of the circuit for studying ohm’s law?

Q. 8. state one limitation for the usage of solar energy?

Q. 9. what is a gene and where is it located?

Q. 10. explain double fertilization in plants?

Q. 11. What is meant by magnetic field?

Q. 12. why chlorophyll green in colour?

Q. 13. give two methods to prevent rusting?

Q. 14. state the functions of gastric glands? 15.explain why stars twinkle?

 

 

 

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