161. Pressure exerted by gas is

1. 1. Independent of the density of the gas

   
   
   

   2. Inversely proportional to the density of the gas

   
   
   

   3. Directly proportional to the density of the gas

   
   
   

   4. Directly proportional to the square of the density of the gas

   
   
   

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   N/A

   Correct Option: C

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162. Which one of the following statements is correct. Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of

1. 1. Convection only

   
   
   

   2. Conduction and convection only

   
   
   

   3. Radiation and convection only

   
   
   

   4. Convection, conduction and radiation

   
   
   

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   N/A

   Correct Option: C

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163. During melting process the heat given to a body is utilised in

1. 1. Increasing the temperature

   
   
   

   2. Increasing the density of the material

   
   
   

   3. Increasing the potential energy of the molecules

   
   
   

   4. Increasing the kinetic energy of the molecules

   
   
   

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   N/A

   Correct Option: C

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164. At normal temperature, due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube

1. 1. Starts becoming hotter

   
   
   

   2. Starts becoming hotter

   
   
   

   3. Remains at the same temperature

   
   
   

   4. May become hotter or cooler depending on the amount of water vapour present in the air

   
   
   

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   N/A

   Correct Option: C

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165. How can boiling point of a liquid be reduced?

1. 1. By adding a solid of lower melting point

   
   
   

   2. By dissolving a soluble solid in it

   
   
   

   3. By increasing the pressure on the liquid

   
   
   

   4. By decreasing the pressure on the liquid

   
   
   

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   Correct Option: D

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