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III. Mark the following statements as true (T) or false (F):                                  1 M x5= 5M

     11. Fertilisation is necessary even in asexual reproduction.                              (      )

  

     12. Liquids exert pressure on the walls of the container.                                       (      )

      

  

     13. The passage of an electric current through a conducting liquid                        (      )

          causes chemical reactions.                                                                                           

   

     14. Uranus is the farthest planet in the solar system                                                (      )

  

     15. Sulphur dioxide and Nitrogen dioxide gases are responsible for acid rain.       (      )

  

 

 

IV. Choose the correct answer from the given options:                                 IM x 5= 5M

16. Which of the following is essential for the production of thyroxine that changes a tadpole to a frog?

(a) Sodium (b) Iodine (c) Nitrogen (d) Oxygen                                                            (    )

17. Force of friction acts on the moving body in

 

(a) The same direction (b) the opposite direction                                                           (   )       

 

(c) Perpendicular direction (d) none of the above

 

18 . In which of the following materials speed of sound is maximum?                           (   )

 

(a) Iron (b) Sea water (c) Fresh water (d) Air

 

19. Which of the following cannot be charged easily by friction?                                   (   )

 

(a) A plastic scale (b) An inflated balloon (c) A copper rod (d) A woollen cloth

 

20. The splitting of white light into its seven constituent colours is called                     (   )

 

(a) Dispersion (b) Reflection (c) Refraction (d) Rectilinear propagation

 

V. Answerthefollowing:

21. Adrenalin is the hormone secreted by an endocrine gland. Name the gland and write about the function of adrenalin

 

22. Give two examples each of situations in which you push or pull to change the state of motion objects.

 

23. What is an electrostatic force? Why is it called a non-contact force?

 

24. lqbal has to push a lighter box and seema has to push a similar heavier box on the same floor. What  will have to apply a larger force and why?

 

25. Give reasons for the following:

i) Powder is sprinkled on the carom board.

 

ii) Sportsmen use shoes with spikes.

 

26. Give two differences between Asteroids and Comets.

    1        2     3    


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