36. When ice melts into water, which type of change occurs in entropy ?

1. 1. increases

   
   
   

   2. decreases

   
   
   

   3. becomes zero

   
   
   

   4. remains unchanged

   
   
   

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   NA

   Correct Option: A

   NA

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37. In which type of coal percentage of carbon is the highest ?

1. 1. Peat

   
   
   

   2. Lignite

   
   
   

   3. Bituminous

   
   
   

   4. Anthracite

   
   
   

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   NA

   Correct Option: D

   NA

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38. Domestic cooking gas consists of mostly

1. 1. Methane and ethane

   
   
   

   2. Liquified butane and isobutane

   
   
   

   3. Ethylene and carbon monoxinde

   
   
   

   4. Hydrogen and acetylene

   
   
   

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   NA

   Correct Option: B

   NA

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39. The law of Lavoisier and Laplace illustrates

1. 1. The principle of conservation

   
   
   

   2. Equivalence of mechanical and thermal energy

   
   
   

   3. The principle of conservation of matter

   
   
   

   4. Equivalence of mechanical and chemical energy

   
   
   

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   NA

   Correct Option: A

   NA

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40. A mixture of carbon monoxide and nitrogen is called

1. 1. Natural gas

   
   
   

   2. Water gas

   
   
   

   3. Producer gas

   
   
   

   4. None

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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