16. Crust is a layer

1. 1. Having 8 to 40 km thickness

   
   
   

   2. Having 20 to 60 km thickness

   
   
   

   3. Having 5 to 15 km thickness

   
   
   

   4. Having 8 to 20 km thickness

   
   
   

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   NA

   Correct Option: A

   NA

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17. The main constituents of earth's crust are

1. 1. Igneous rocks

   
   
   

   2. Sedimentary rocks

   
   
   

   3. Metamorphic rocks

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: A

   NA

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18. Exogenic forces are connected with

1. 1. Plucking action

   
   
   

   2. Volcanic action

   
   
   

   3. Lithospheric

   
   
   

   4. Atmospheric

   
   
   

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   NA

   Correct Option: D

   NA

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19. The upper part of the mantle upon which the crust of the earth floats is called

1. 1. Barysphere

   
   
   

   2. Mesosphere

   
   
   

   3. Mohorovic discontinuity

   
   
   

   4. Asthenosphere

   
   
   

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   NA

   Correct Option: D

   NA

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20. Epirogenetic movement give rise to

1. 1. Shields

   
   
   

   2. Plains

   
   
   

   3. Volcano

   
   
   

   4. Fold mountain

   
   
   

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   NA

   Correct Option: D

   NA

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