6. In any natural process

1. 1. The entropy of universe remains constant

   
   
   

   2. The entropy of universe tends towards maximum

   
   
   

   3. The entropy of universe towards minimum

   
   
   

   4. Any of the above can happen

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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7. Water gas is a mixture of

1. 1. CO + N₂

   
   
   

   2. CO + H₂

   
   
   

   3. CH₄ + CO

   
   
   

   4. None

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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8. The gas supplied in cylinders for cooking is

1. 1. Marsh gas

   
   
   

   2. LPG

   
   
   

   3. Mixture of CH₄ and C₂H₆

   
   
   

   4. Mixture of ethane and propane

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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9. Octane number of fuel can be increased by

1. 1. Isomerisaiton

   
   
   

   2. Alkylation

   
   
   

   3. Reforming

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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10. The efficiency of a heat engine is maximum when

1. 1. temperature of source is greater than that of sink

   
   
   

   2. temperature of sink is greater than that of source

   
   
   

   3. temperature difference of source and sink is minimum

   
   
   

   4. temperature difference of source and sink is maximum

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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