41. Which one of the following has maximum colorific value ?

1. 1. Water gas

   
   
   

   2. Producer gas

   
   
   

   3. Oil gas

   
   
   

   4. Coal gas

   
   
   

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   NA

   Correct Option: C

   NA

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42. During isothermal expansion of an ideal gas, its

1. 1. Internal energy increases

   
   
   

   2. Enthalpy decreases

   
   
   

   3. Enthalpy remains unaffected

   
   
   

   4. Enthalpy reduces to zero

   
   
   

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   NA

   Correct Option: C

   NA

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43. An ideal fuel should have

1. 1. High calorific value

   
   
   

   2. Low ignition temperature

   
   
   

   3. Regulated and controlled

   
   
   

   4. All of the above

   
   
   

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   NA

   Correct Option: D

   NA

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44. A mixture of carbon monoxide and hydrogen is called

1. 1. Producer gas

   
   
   

   2. Water gas

   
   
   

   3. Natural gas

   
   
   

   4. None

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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45. In which of the following, the entropy decreases ?

1. 1. Crystallisation of sucrose from solution

   
   
   

   2. Rusting of iron

   
   
   

   3. Melting of ice

   
   
   

   4. Vaporization of comphor

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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