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SS2  10 CLASS

PHY 1-2

An object is placed at a distance of 10cm from a convex mirror of focal length 15cm.Find the position and nature of the image?

Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

A convex lens of focal length 50 cm

A concave lens of focal length 50 cm

A convex lens of focal length 5 cm

A concave lens of focal length 5 cm

An object is placed at a distance of 25 cm from a spherical mirror and its image is formed behind the mirror at a distance of 5 cm. Find the focal length of the mirror. Is the mirror concave or convex in nature? Give one use of identified mirror.

Watching the sunset on a beach, one can see the sun for two minutes after it has actually set, explain.

16.        (a) State second law of refraction of light.

(b) Draw a diagram showing refraction of light through a rectangular glass slab. What is lateral displacement? How does it depend on thickness of glass slab and angle of incidence?Or

Why are ‘danger’ signal lights red in colour?

Light enters from air into glass of refractive index 1.5. What is the speed of light in glass? The speed of light in vacuum is 3 X 108 ms –1.

Q.5      Why do silver articles tarnish after some time?

Q.6      Why are electric bulbs usually filled with chemically inactive gases such as nitrogen and argon? 

question1_light_reflection_convex_mirrorx2007_08_sc_II_01_q_no11What defect is shown in the given figure?

What is the cause of this defect?

How is this defect corrected by using spectacles?

Why does the sun appear reddish early in the morning?

A ray of light LM is incident on a mirror as shown in the figure.

Show the angle of incidence.

           

Define 1 dioptre of power of a lens.

Q.4      The following table gives the values of refractive indices of a few liquid media:

S.No.

1

2

3

4

5

Medium

Kerosene

Water

Alcohol

Benzene

Turpentine

Refractive index

1.44

1.33

1.36

1.50

1.47

Light passes through these media one by one. Arrange the given media in the decreasing order of the speed of light.

How far should an object be held from a concave mirror of focal length 40 cm so as to form an image magnified three times

 

 

The following table gives the values of refractive indices of a few liquid media: Light passes through these media one by one. Arrange the given media in the increasing order of the speed of light.

 

S.No.

1

2

3

4

5

Medium

Alcohol

Benzene

Kerosene

Water

Turpentine

Refractive index

1.36

1.50

1.44

1.33

1.47

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

A convex mirror used for rear-view on an automobile has a radius of curvature of 3.00 m. If a bus is located at 5.00 m from this mirror, find the position, nature and size of the image.Describe an experiment in detail to study refraction of light through a prism Draw with a ray diagram too. What do you mean by angle of deviation?   OR

Describe an experiment to study refraction of a light ray through a rectangular glass slab what are the important result obtained from the experiment?

5What is the roll of pupil in the eye?  1

6 Write the focal length of lens of power 1.5 D

.[i] It is advised in  traffic rules pedestrians should be wear white cloths during night. why?

[ii] Define in spherical mirror the terms, Radius of curvature, and Focal length

[iii]Draw ray diagram when objects is placed at C in front of concave mirror           1+1+1

12[i] Why is a normal eye not able to see clearly the objects placed closer than 25cm?       

[ii]The change in focal length of an eye lens is caused by the action of the ----------     2+1

Far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to enable him to see very distant objects distinctly

What are the unique features of Carbon?

.                             (1+1+1)

A thin converging lens form a    (i) real image    (ii) virtual image

of an object placed in front of it. The size of the image is three times the size          of the object in each case. Draw labeled diagram to show the image formation            in each case.

How will the focal length of such a lens be affected on cutting it into two equal     halves along the principle axis?                                                                                          (3)

How many covalent bonds does ethane has? [1]

Q.2 In which form H+ ions exists in water?[1]

Q.3 Write Snell’s Law. [1]

Q.4 Which Liquid fills the space between eye lens and retina? [1]

Make a diagram to show how Hypermetropia is corrected. The near point of a Hypermetropic eye is 1m, what is the power of the lens required to correct this defect. Assume near point of normal eye is 25cm. [3]

 

 

 

 

 

 

 

 

 

 

CHEM 3-4

13[i].Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?.                                                             

[ii] Name two elements that have a single electron in their outermost shells 2+1

14[i] Explain why the atomic number of an element is more important for a chemist as compare to its atomic mass.

[ii] Name the two elements whose atomic masses were corrected on the basis of their position in the Mendeleev’s periodic table.

[iii] Explain why argon atom bigger in size than a Chlorine atom?                            1x3     

15. [i] Explain the formation of scum when hard water is treated with soap.                                   

[ii How would you distinguish experimentally between an alcohol and a carboxylic acid?

What is functional group? Name the functional group which always occurs in the middle of a carbon chain?

[ii] Explain why, diamond is hard where as graphite is soft?

Write the structural formula and IUPAC name of Isobutanol.

b) Which two of the following compounds could belong to the same homologous   series?

C2H6O2,  C2H6O,  C2H6, CH4O                                                                      (1+1)

The position of three elements A,B  and C in the periodic table are shown below.     (2)

Group 16                                 Group  17

S…….                                              A

B                                               C

State whether A is a metal or non-metal

State whether C is more reactive or less reactive than A

Will C be larger or smaller in size than B?

Which type of ion, Cation or Anion , will be formed by element A?

Write reactions of carboxylic acids (Take any example of Carboxylic acid) 
    with : (i) bases                     (ii) alcohols                  (iii) Sodium Carbonate.     
          (3)                                                    

b) Explain the formation of micelles.            (2)                              OR

Given the following elements: Mg, Si, Na, Cl, Ar, Si, P. Arrange the above elements in a systematic way and answer the following questions.

Draw the Lewis structure of Ethanal.

c) Give a method for the preparation of Acetic Acid                                                                                  

State the Modern Periodic Law. [1]


OR             Draw the structures for the following compounds:
(i) Butanone (ii) Hexanal (iii) Methanol (iv) Propyne (v) Ethanoic acid [5]

18An organic compound ‘A’ is a constituent of wine and cough syrup. This compound on heating with alkaline potassium permanganate forms another organic compound ‘B’. Compounds ‘A’ and ‘B’ react with each other to form a sweet smelling substance ‘C’.

(i)Identify the compounds ‘A’, ‘B’ and ‘C’.

(ii)Write the chemical equation for the conversion of A into B.

(iii)Name and write the chemical reaction taking place between A and B.

(iv)Name the process to get compound ‘B’ back from ‘C’ and write corresponding chemical equation

Why does micelle formation take place when soap is added to water?         (2)

Explain the formation of scum when hard water is treated with soap?         (1)

What change will you observe if you test soap with litmus paper (red and blue)?    (1)

Would you be able to check if water is hard by using a detergent?   (1)

 

 

 

 

 

Write the by product formed during the formation of soap? Also write its formula

9.How is graphite is used in lead Pencils

Ethane, with the molecular formula C2H6 has ______covalent bonds.

What is hydrogenation? What is its industrial application?

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belongs to group 15 of periodic table. Write the electronic configuration of these two elements. Which of these will be electronegative and why?

On the basis of the atomic structure, how the first and the last element of a period in the periodic table is determined?

(i) Distinguish between: (Give chemical reactions)

Esterification and Saponification.

The electronic configuration of an atom X is (2, 8, 7). It combines with another atom Y having one electron in the   outermost shell. (a) What type of bond will be formed between X and Y?  (b) Write the formula of the   compound formed. (c) Is it soluble in water? Why?Or

Define saturated hydrocarbons. What is the other name given to it?

Name the simplest saturated hydrocarbon.

Name some organic compounds with different functional groups containing oxygen. Show how they have been derived from the simplest saturated hydrocarbon. Also mention the specific functional group present.

Draw the electron dot structure of cyclohexane. With which homologous series does cyclohexane share its general formula?

(e)        Write the formula of the compounds formed when (i) Y reacts with L and (ii) Z reacts with G.

Q.16    How are Na, Ca and Al different from one another in terms of their reaction with water? Explain with Letters X, Y, Z, E, G, L, Q, R, and T. These letters are not the symbols for the elements concerned. By reference to the table answer the following questions:

(a) Which is a noble gas?

(b) Out of X, Z and G, which has the largest atomic size?

(c) To which period does E belong?

(d) Which elements belong to the same group?

(f) Write the formula of the compounds formed when (i) G reacts with Y and (ii) X reacts with chemical reactions  Z

 

 

 

Elements

Electronic configuration

           

            K         L          M         N         O

X

            2          8          3

Y

            2          8          18        5

Z

            2          8          7         

E

            2          8          18        8          1

G

            2          8          2         

L

            2          5         

Q

            2          8          18        8

 

14An object is placed at a distance of 10 cm from a concave mirror of focal length 20 cm. (a) Draw ray diagram for formation of the image; (b) Calculate the image distance; (c) state the characteristics of image formed.    

Q.15(i)Write the common name of ethanol.

(ii)        Name two substances in which ethanol is an important constituent.

(iii)       What happens (Give chemical equation) when sodium reacts with ethanol?

(iv)       What happens (Give chemical equation) when ethanol is heated at 443K with excess of concentrated sulphuric acid?

(v)        Why is the conversion of ethanol to ethanoic acid an oxidation reaction?       Or

(a)        Explain the cleansing action of soaps?           (2)

What is hydrogenation? What is its industrial application?    (2)

What type of fatty acids are considered to be healthy and why

18 Define Isomerism. Write down the structures and names of butane isomers.

Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH­3COOH) is added to test tube B. In which of test tube will the fizzing occur more vigorously and why

Q.14    In the periodic table given below lithium, carbon, oxygen and neon have been placed in their correct positions. The positions of nine other elements have been represented by letters X, Y, Z, E, G, L, Q, R, and T. These letters are not the symbols for the elements concerned. By reference to the table answer the following questions:

Groups

1

2

3 to 12

13

14

15

16

17

18

Period 2

Lithium

 

 

 

Carbon

 

Oxygen

L

Neon

Period 3

X

 

 

 

E

 

G

Q

 

Period 4

Y

 

 

 

 

 

 

R

 

Period 5

Z

 

 

 

 

 

 

T

 

(a)        Write the electronic configuration of E. Also mention its valency.

(b)        Arrange the elements G, E and Q in the increasing order of non-metallic character.

(c)        Name the family of elements represented by X, Y, and Z.

(d)       Will L and X+ have the same number of electrons? Justify your answer.

           

Q.16    In the periodic table given below lithium, carbon, oxygen and neon have been placed in their correct positions. The positions of nine other elements have been represented by letters X, Y, Z, E, G, L, Q, R, and T. These letters are not the symbols for the elements concerned. By reference to the table answer the following questions:

Groups

1

2

3 to 12

13

14

15

16

17

18

Period 2

Lithium

 

 

 

Carbon

 

Oxygen

L

Neon

Period 3

X

 

 

 

E

 

G

Q

 

Period 4

Y

 

 

 

 

 

 

R

 

Period 5

Z

 

 

 

 

 

 

T

 

(a)Give the letter of the most reactive metal.

(b)Give the letter of the most reactive non-metal.

(c)Name the family of elements represented by L, Q, R, and T.

(d)Arrange the elements Z, Q, R, and Y in the increasing order of their size.

(e)Write the formula of the compounds formed when (i) Y reacts with G and (ii) E reacts with Q.

 

Q.17An organic compound ‘A’ is a constituent of wine and cough syrup. This compound on heating with alkaline potassium permanganate forms another organic compound ‘B’. Compounds ‘A’ and ‘B’ react with each other to form a sweet smelling substance ‘C’.

(i)Identify the compounds ‘A’, ‘B’ and ‘C’.

(ii)Write the chemical equation for the conversion of A into B.

(iii)Name and write the chemical reaction taking place between A and B.

(iv)Name the process to get compound ‘B’ back from ‘C’ and write corresponding chemical equation.

(v)What happens when A burns in the presence of oxygen? Write the chemical equation.

            Or

(a)Why does micelle formation take place when soap is added to water?     (2)

Explain the formation of scum when hard water is treated with soap?         (1)

What change will you observe if you test soap with litmus paper (red and blue)?    (1)

Would you be able to check if water is hard by using a detergent?   (1)

 

 

 

 

 

 

 

BIO 3-4-5     

 

What are fossils?

What factors could lead to the rise of a new species?

How does binary fission differ from multiple fission?

What are the trophic levels? Give an example of food chain and state different trophic levels in it.

Answer the following:

Why should we conserve forests and wildlife?

What would be the advantages of exploiting resources with short term aims?

What is a trait? Who contributes to the traits present in a child? How many copies of traits are present in every individual? What is the manner in which a trait is inherited and expressed in an organism?

What are the ill effects of hormonal pills and copper T?

List the advantages of vegetative reproduction

What are considered ‘biodiversity hotspots’?

What is meant by rainwater harvesting? Mention the advantage of following this practice.

A cow looses a lot of weight due to starvation? Will this character be transmitted as an inherited trait? Justify. Describe the characteristics of flow of energy in an ecosystem

 (i)Name the hormones secreted by testis and ovaries.

(ii)What is the role of sex hormones in the process of reproduction?

How does spirogyra reproduce?         

What is meant by the term 'sustainable development'? Suggest any two ways to achieve it.

If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases? Justify.

Consider the food chain given below:

            Plants Deer Tiger

            What would happen if we kill all the deer?

Study the given data and answer the questions following the data. 

Parental plants cross fertilised & seeds collected

F1 (first generation off spring)

F2 (offspring of self pollination of F1)

Male parent always bore red flowers. Female parent always had white flowers.

330 seeds sown and observed. All 330 gave red flowers

Out of 44 seeds 33 seeds gave plants with red flowers and 11 seeds gave plants with white flowers.

(i)What is the term for this type of cross?

(ii)What does the data of the column marked F1 indicate?

Express the genotype of the (a) parents (b) F1 Progeny and (c) F2 Progeny  Or

Will a tailless mouse have a tailless progeny? Justify.

Give any two ways in which non-biodegradable substances would affect the environment?

Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?

Study carefully the food chains given below:             

Food chain I:   grass   grasshopper   frog

Food chain II: wheat   rat   snake   hawk

To which of the two consumers frog or hawk will more energy (percent) be available and why?

What is genetic drift?

.In which part of the female reproductive organ of human female fertilization take place & what happen to the fertilized the egg?

What is the function of recepters & effector organ?

How do we know how old fossils are?

25.What is meant by pollination? Describe its various types a long with name of various pollination agents?

What is meant by vegetative propagation? Describe its various ways. What is significance of vegetative propagation

24What is biomagnifications? Will the levels of this magnification be different at different levels of the ecosystem?                                                                                                                        2

25.[i] Suggest four approaches towards the conservation of forests

[ii] Write the three R’s to save the environment

What are the functions performed by the testis in human beings?

[iii]Why does menstruation occur?

What are fossils? What do they tell about the process of evolution? (2)

25.How is ozone formed in the upper atmosphere? Why is damage to ozone layer a cause of concern to us? What causes this damage

Why are traits acquired during the life time of an individual not inherited? [1]

Consider the food-chain: Grass –-> Dear ––> Lion
What will happen if lions are removed from the above food chain? [2]

How is ozone formed in the upper atmosphere? Why is the damage to ozone layer a cause of concern to us? What causes the damage? [3]

Q.27 Draw the diagram of reproductive system of human female. Label fallopian tube, Uterus, cervix and vagina. What is ovulation and when does it take place during the menstrual cycle? Where does fertilization take place?

Maximum energy is found at which trophic level? What is the status of energy at tertiary consumer level?

Define biodiversity. Why is it important to conserve biodiversity?              

How does we have try serve as carrier of infective organisms.

Mention two ways to prevent it.

Define a biosphere? What are the 2 main function of a biosphere.

Q-27 What is a smog? What are the two effects of smog?

Name one sexually transmitted disease each caused due to bacterial infection and viral infection. How can these be prevented?                                          (2)

What is the effect of DNA coppying  which is not perfectly accurate on the reproduction process?           (1)

. 22 Differentiate between homologous organs and analogous organs. [2]

 

 

 

 
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