11. If a refrigerator's door is kept open, then

1. 1. room will be cooled

   
   
   

   2. room will be heated

   
   
   

   3. may get cooled or heated depending upon the weather

   
   
   

   4. no effect on room

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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12. Which has maximum calorific value ?

1. 1. Fat

   
   
   

   2. Protein

   
   
   

   3. Carbohydrate

   
   
   

   4. Amino acid

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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13. Which fuel has the maximum calorific value ?

1. 1. Charcoal

   
   
   

   2. Kerosene

   
   
   

   3. Wood

   
   
   

   4. Cow-dung

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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14. The standard state in chemical energetics implies

1. 1. 1 atm pressure at 273 K

   
   
   

   2. 1 atm pressure at 297 K

   
   
   

   3. 1 bar pressure at 298 K

   
   
   

   4. 1 bar pressure at specified temperature

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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15. Which of the following is a closed system ?

1. 1. Jet engine

   
   
   

   2. Tea placed in steel kettle

   
   
   

   3. Pressure cooker

   
   
   

   4. Rocket engine during propulsion

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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