151. White clothes are cooler than black ones because they

1. 1. Absorb all the light that reaches them

   
   
   

   2. Reflect all the light that reaches them

   
   
   

   3. Will not allow the light to penetrate

   
   
   

   4. Cool the sun light completely

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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152. The water from a hand-pump is warm in winter because

1. 1. Our body is cold in winter and water appears to be warm

   
   
   

   2. The temperature inside the earth is higher than the atmospheric temperature

   
   
   

   3. The pumping process causes friction which warms up the water

   
   
   

   4. Inside water comes out and absorbs heat from the environment

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: B

   N/A

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153. According to Newton's law of cooling, the rate of cooling of a body is proportional to the

1. 1. Temperature of the body

   
   
   

   2. Temperature of the surrounding

   
   
   

   3. difference of the temperature of the body and its surroundings

   
   
   

   4. None of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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154. The product of the pressure and volume of an ideal gas is

1. 1. A constant

   
   
   

   2. Approximately equal to the universal gas constant

   
   
   

   3. directly proportional to its temperature

   
   
   

   4. Inversely proportional to its temperature

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: C

   N/A

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155. Consider the following statements
     1. Steam at 100°C contain same amount of heat
     2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water
     3. In air-conditioner, coils and is rejected out at the condenser coils
     Which of these statements is / are correct ?

1. 1. 1 and 2

   
   
   

   2. 2 and 3

   
   
   

   3. Only 2

   
   
   

   4. Only 3

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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