16. China wares are wraped in straw of paper before packing. This is the application of concept of

1. 1. impulse

   
   
   

   2. momentum

   
   
   

   3. acceleration

   
   
   

   4. force

   
   
   

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1. View Hint View Answer Discuss in Forum

   impulse

   Correct Option: A

   impulse

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17. A passenger in a moving train tosses a coin. If the coin falls behind him, the train must be moving with

1. 1. an acceleration

   
   
   

   2. a deceleration

   
   
   

   3. a uniform speed

   
   
   

   4. any of the above

   
   
   

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   an acceleration

   Correct Option: A

   an acceleration

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18. Ventilators are provided at the top of room

1. 1. to bring oxygen for breathing

   
   
   

   2. so that sunlight may enter the room

   
   
   

   3. to maintain conventional currents to keep the air fresh in the room

   
   
   

   4. to provide an outlet for carbon dioxide

   
   
   

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   to maintain conventional currents to keep the air fresh in the room

   Correct Option: C

   to maintain conventional currents to keep the air fresh in the room

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19. A man is standing on a boat in still water. If he walks towards the shore, the boat will

1. 1. move towards the shore

   
   
   

   2. move away from the shore

   
   
   

   3. remain stationary

   
   
   

   4. sink

   
   
   

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   The boat will move away from the shore. According to Newton's 3rd law of motion, to every action there is an equal but opposite reaction.

   Correct Option: B

   The boat will move away from the shore. According to Newton's 3rd law of motion, to every action there is an equal but opposite reaction.

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20. In automatic wrist watches energy is provided by

1. 1. manual binding

   
   
   

   2. battery

   
   
   

   3. liquid crystal

   
   
   

   4. different movements of our hand

   
   
   

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1. View Hint View Answer Discuss in Forum

   In automatic wrist watches energy is provided by different movements of our hand.

   Correct Option: D

   In automatic wrist watches energy is provided by different movements of our hand.

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