1. If a liquid is heated in space under no gravity, the transfer of heat will take place by process of

1. 1. conduction

   
   
   

   2. convection

   
   
   

   3. radiation

   
   
   

   4. can not be heated in the absence of gravity

   
   
   

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1. View Hint View Answer Discuss in Forum

   radiation

   Correct Option: C

   radiation

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2. Evening Sun is not as hot as the mid day sun. What is the reason?

1. 1. In the evening, radiation travel slowly

   
   
   

   2. In the evening, the temperature of the sun decreases

   
   
   

   3. Ozone in atmosphere absorbs more light in the evening

   
   
   

   4. In the evening, radiations travels larger distance through atmosphere

   
   
   

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1. View Hint View Answer Discuss in Forum

   In evening, the radiations from the sun travel larger distance through atmosphere that's why evening sun is not as hot as the mid day sun.

   Correct Option: D

   In evening, the radiations from the sun travel larger distance through atmosphere that's why evening sun is not as hot as the mid day sun.

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3. Why do two ice blocks join to from one block when pressed together?

1. 1. Melting point of ice is lowered with increase in pressure

   
   
   

   2. Melting point of ice increases with increase in pressure

   
   
   

   3. Melting point of ice remains unchanged with increase in pressure

   
   
   

   4. Melting point of ice 0° C

   
   
   

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1. View Hint View Answer Discuss in Forum

   Melting point of ice decreases with increase in pressure.

   Correct Option: A

   Melting point of ice decreases with increase in pressure.

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4. L.P.G. is mostly liquefied

1. 1. hydrogen

   
   
   

   2. oxygen

   
   
   

   3. butane

   
   
   

   4. methane

   
   
   

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1. View Hint View Answer Discuss in Forum

   butane

   Correct Option: C

   butane

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5. A fan produces a feeling of comfort during hot weather, because

1. 1. our body radiates more heat in air

   
   
   

   2. fan supplies cool air

   
   
   

   3. conductivity of air increases

   
   
   

   4. our perspiration evaporates rapidly

   
   
   

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1. View Hint View Answer Discuss in Forum

   A fan produces a feeling of comfort during hot weather, because our perspiration evaporates rapidly.

   Correct Option: D

   A fan produces a feeling of comfort during hot weather, because our perspiration evaporates rapidly.

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