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Chapter- Lifeprocess - Control & coordination   -Reaction, Bases, Acid and Salts+ Metals  PHYSICS  Electricity, Magentism & Source of energy   Time=3 hours       MM=150


SECTION A   Do any 30                                                               MM=30

1)      In which parts of the plant are sugars and hormones synthesized? (1)

2)      Give the differences between Arteries, Veins and Capillaries. (1.5)

3)      List two vital functions of Human Kidney? (1)

4)      Name the two membranes covering the Lungs.( 1)

5)      What are Epiglottis and its function( 1)

6)      What are meninges?                       1

7)      What  is the function of Gibberellins, Ethene and Auxins? (1)

8)      What are nastic movements? Give one example. (1)

9)      Why should water be never added drop wise to concentrate sulphuric acid? (1)

10)   Dry ammonia gas has no action on litmus paper, but a solution of ammonia in water turns red litmus paper blue. Why is it so? (1)

11)   Why does dry litmus paper not show colour change with solution of dry HCl in dry toluene? (1)

12)   If soil is acidic, what compound you spread to treat the soil? (1)

13)   What is a milk of magnesia? Is it strong or mild base? (1)

14)   Why should curd and sour substances not be kept in brass and copper vessels? (1)

15)   Two solutions have pH numbers 7 and 2 respectively. Which solution has more H+ conT? (1)

16)   ‘Sweet tooth’ may lead to tooth decay. Explain why? What is the role of toothpaste in preventing cavities?  (1.5)

17)   Milkman adds a very small amount of baking soda to fresh milk.                   (1 ½) EACH

a.       (a)Why does he shift the pH of fresh milk from 6 to slightly alkaline?  (b)What do you expect to observe when the milk comes to a boil?

b.      (c)Why does this milk take a long time to set as a curd?

18)   Why should magnesium ribbon be cleaned before burning in air? (1)

19)   Which of the statements about the reaction below are incorrect?            (1)                                                          2PbO (s) + C (s)                                2Pb   (s)   + CO2   (g)        

(a)Lead is getting reduced.                                                                                                                         

(b)Carbon dioxide is getting oxidised.                                                                                    

(c) Carbon is getting oxidised(d) Lead oxide is getting reduced. (i) a and b  (ii) a and c (iii)a, b and c (iv)    

20)   What happens when ferrous sulphate is heated strongly? Give the chemical equation for the change. (1)

21)   Identify the substances oxidised and the substances reduced in the following reactions. Write the ionic equation for the substances oxidised and reduced :          (1) EACH

(i) H2 (g)   +   Cl2 (g)                         2 HCl (g)                                                                                                                

(ii) H2 (g) +     CuO  (s)                                 Cu (s) + H2O (l)                                                                                      

(iii) H2S (g)  + SO2 (g)                     S (s) + H2O  (l)

22)   A metal M acquires a green colour coating on its surface on exposure to air. Identify the metal M and name the process responsible for this change.(A) Element A has 4 electrons in the outermost shell of its atom and combines with another element B having 7 electrons in the outermost shell of its atom. The compound formed does not conduct electricity. What is the nature of the chemical bond in the compound?(1)  (B)  Give the electron dot structure of its molecule (1)

23)   Name any two elements used for fabrication of solar cells ?   (1)               

24)   Give one example of controlled and uncontrolled nuclear fission reactions?        (1)

25)   What is thermonuclear reaction?     (1)Why is copper tube direct and indirect source of harnessing solar energy ?       (1)

26)   Which chemical is added to LPG to detect leakage?  (1)

27)   An electron enters a magnetic field at right angle, what will be the direction of the force acting on the electron?         (1)

28)   Find the work done by an electron to maintain the potential difference of 80V?    (1)

29)   What is the potential difference between the ends of 16Ω resistance, when a current of 1.5A flows through it?  (1)

30)   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? (1)

31)   If there are 108 electrons flowing across any cross section of a wire in 4 minutes, what is the current in the wire? (1)   

SECTION B Do any 40                                                                MM=80

1)      What do the following transport ? (i) xylem (ii) phloem (iii) pulmonary vein (iv) Vena Cava. (2)

2)      Plant absorbs  the  water  from  the  soil . How  does this water reach the tree tops. Explain in  detail    (2 )                         

3)      What are the events that occur in photosynthesis ?                                                         (2)

4)      Write two ways by which plants get rid of their waste.                                                     (2)   

5)      Is respiration a chemical process? Justify.                                                                                 (2)

6)      Give one role of the following (i) pulmonary vein (ii) lipase (iii) aorta (iv) kidney.  (2)

7)      Define the term Transportation? Why it is needed       (2)

8)      What is transpiration? Give the term for the transfer of food from leaves to the other parts of the  plant.(2)

9)      What is translocation? Why is it necessary for the Plant?

10)   Explain briefly the components of the Xylem and Phloem tissues. (2)

11)   Name the Blood vessel that brings the oxygenated blood to the Human heart. Which chamber of heart receives the oxygenated blood?   (2)

12)   Why the blood circulation in Human beings is called ‘Double Circulation’(2)

13)   Name the constituents of Blood. Why the White Blood Cells are called ‘Soldiers of the Body’? (2)

14)   Name the excretory organs in: Amoeba, Flat worm, Earth worm, Planaria. (2)

15)   Name the organelles which are responsible for Photosynthesis .Write a short note on Light and Dark reactions   (2)

16)   What are the end products of aerobic and anaerobic respiration? Give the equations involved (2)

17)   What is the composition of nerves system in higher vertebrate?           2

18)   What is feed back mechanism ? Explain it in relation to hormonal action          2     

19)   What may happen if you touch the leaves of Nettle plant? What is the remedy for such observation?      2

20)   Give methods.a) How does the nervous tissue cause action ?       (b) How are Fats and Proteins digested in our body.2

21)   “Nervous and the hormonal system together perform the function of the control and coordination in the humans”. Justify. (2)

22)   (b) Mention the functions of each of the following plant hormones. (i)Auxin (ii) Abscisic acid.  2

23)   Write differences  between:  a) Artery and Vein    (2)

24)   What is the difference between photoperiodism and phototropism? (2)

25)   A solution turns red litmus blue, its pH is likely to be   (a) NaCl   (b) HCl  (c) LiCl     (d)KCl(2)

26)   What is efflorescence? Give an example. (2)

27)   How is Plaster of Paris chemically different from gypsum? How may they be inter-converted? Write one use of Plaster of Paris?     (2)

28)   Give two important uses of washing soda and baking soda? (2)

29)   Why does milk become sour if kept for a long time?            (2)

30)   What happens when Copper metal is dipped in Silver nitrate solution? Give the balanced chemical equation for the change?  (2)

31)   Which is the reaction used in white washing the walls? (2)

32)   Why do gold and platinum not corrode in moist air? (2)

33)   Write the balanced chemical equations for the following chemical reactions:  (2)                                         

(I) Aqueous solution of Sulphuric acid and Sodium hydroxide react to form aqueous Sodium sulphate and water.(ii) Phosphorus burns in Chlorine gas to form phosphorus pentachloride.

34)   Explain the term in terms of electron transfer: (i) Oxidation (ii) Reduction. (2)

35)   Why respiration is considered an exothermic reaction? Explain (2)

36)   Oil and fat containing food items are flushed with nitrogen. Why? (2)

37)   What do you mean by precipitation reaction? Explain giving examples? (2)

38)   What is hydro-electricity? Explain the basic principle of its generation?   (2)

39)   What is the principle of working of a solar cooker? Write two major drawbacks of all solar heating devices ?                     (2)

40)   A wind-mill is being used to operate a pump for lifting water from a tubewell to a tank at some height above the ground. List any four steps in sequence in which free energy gets transferred from the form to another in this process ?    (2

41)   Electricity generated by a windmill can be considered to be another form of solar energy". Explain this by describing the series of steps in generation of electricity by a windmill ?     (2)

42)   Differentiate between renewable and non-renewable sources of energy. Give two examples of each   (2)

43)   A student constructed a box-type solar cooker. He found that it did not work efficiently. What could this be due to ? Give four possible mistakes in the construction and operation of the solar cooker. What maximum temperatre can ordinarily be attained inside the solar cooker ?     (2)

44)   Name the gases produced by complete and incomplete combustion of charcoal. Which one of them is poisonous ? Explain how it affects the human system ?      (2)

45)   State four characteristics of an ideal fuel.      (2)

46)   Name the constituents of LPG. Why is LPG considered as ideal fuel ?     (2)

47)   Why is fuel oil considered better fuel than coal in industries to heat boilers ? Give any two reasons. (2)"

48)   A biogas plant solves the fuel as well as environmental problems." Discuss ?    (2)

49)   State two disadvantages of energy system using nuclear fission over those using fossil fuels ?    (2)

50)   What is meant by critically of a nuclear reactor ? (2)State any two differences between an atom bomb and a hydrogen bomb ?  (2)

51)   What mechanism is used to control the chain reaction in a nuclear reactor ? How is a chain reaction stopped in a reactor ? (2)

52)   Why don’t two magnetic lines of force intersect each other? (2)

53)   A straight copper conductor, whose ends are connected to a sensitive galvanometer, is moved up and down in a strong field. (a) State your observations. (b) What kind of energy transformations takes place in the above experiment?  (2)

54)   What is the relation between charge and current? How much work is done in moving a charge of 2c across two points having a potential difference of 12 V?  (2)

55)   What is electromagnetic induction? Write one difference between direct current and alternating current. (4)

56)   Give the characteristics of magnetic field lines  (2)

57)   A copper wire has diameter o.5mm and  resistively  1.6 x 10-8 ohm m what will be the length of this wire to make the resistance of 10 ohms? (2)

58)   Find the effective resistance of resistors 10 ohms and 100 ohms. in series and  parallel ? (2)

59)   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. ? (2)

60)   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.? (2)      


SECTION C Do any 5                                                         MM=15

1)      Name the main organs of Human digestive system in the order in which they are involved in digesting food. In what steps and how does digestion of carbohydrates and proteins take place in our body. (3)

2)      Give any three differences between aerobic and anaerobic respiration )3)

3)      Draw the schematic diagram and Define reflex action, reflex arc with suitable example.(3)

4)      (a)What is (i) phototropism & (ii) geotropism? With labelled diagrams describe an activity to show that light and gravity change the direction that plant parts grow in?     ( 3)

5)      Three resistors 3,4,5 ohms are joined in parallel in a circuit. If a current of 150 mA flows through the resistor of  4 ohms, then find the values of the current in mA which will be flowing in other two resistors? (3)

6)      Two resistors of same materials has been connected in series first and then in parallel. Draw a V – I graph  to distinguish  these connection.?  (3)



                                                                SECTION D Do any 5                          MM=25

1 )(i)Draw a labelled diagram of human brain.  (ii) Label it (a) cerebrum (b) cerebellum (c) medulla(d) hypothalamus.   (iii) Write the function of (a) cerebrum (b) cerebellum(c) pons (d) midbrain        5  

2 )Two bulbs of 100 W and 25 W are connected in series to 200 V-AC mains. Which bulb glows brightly? Explain your observation. (ii) Why does the element of a room heater becomes red hot but the lead wires remain cold. (iii) An electric bulb gives bright light when connected to 12 V DC source. Will it glow if connected to 12 V AC source? (iv) Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5A.  (1+1+1+2)

3)   What is the nature of salts? Are they all neutral? Using  your  knowledge complete the following( 5)    table.

Salt sample

Action on litmus

Action on pH paper


Sodium chloride




Potassium nitrate




Aluminium chloride




Zinc sulphate




Copper sulphate




Sodium acetate




Sodium carbonate








Sodium hydrogen carbonate





4) Brine solution is neutral. On electrolysis of brine solution, two gases are evolved at two different electrodes and the solution turns red litmus blue. What does it indicate? Name the two gases which are formed on these electrodes. Why the nature of solution changes after electrolysis? What is this process called? Write the balanced chemical equation for the reaction    (5)

(5) Explain how the following metals are obtained from their compounds by the reduction process : (i) metal ‘X’ which is low in reactivity series. (ii) Metal ‘Y’ which is middle of the series (iii) metal ‘Z’ which is high up in the reactivity series. What is meant by refining of metals? Name any two methods used for refining of metal.(5)

(6) What  is  the type of domestic connection. Give  their importance. What is a importance of Insulation in domestic wires Why alloy ar better option then that of pure metals for making elements of heater. What is Dynamo, electric motor, what laws govern them state both (5)





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