71. For a body float in a liquid with some portion outside, the weight of the liquid displaced by the fully immersed body

1. 1. Should be equal to the weight of the body

   
   
   

   2. Should be more than the weight of the body

   
   
   

   3. Should be less than the weight of the body

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: B

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72. Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to a equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, them which vessel is emptied first?

1. 1. Vessel B

   
   
   

   2. All the vessel A, B and C will be emptied simultaneously

   
   
   

   3. Vessel A

   
   
   

   4. Vessel C

   
   
   

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   N/A

   Correct Option: D

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73. A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is

1. 1. Driving force in the direction of car's motion

   
   
   

   2. Resistance force opposite to the direction of car's motion

   
   
   

   3. An inclined force

   
   
   

   4. Equal to zero

   
   
   

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   N/A

   Correct Option: D

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74. In order that a floating object be in stable equilibrium, its centre of buoyancy

1. 1. Should be vertically above its centre of gravity

   
   
   

   2. Should be vertically below its centre of gravity

   
   
   

   3. Should be horizontally in line with its centre of gravity.

   
   
   

   4. May be anywhere

   
   
   

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   N/A

   Correct Option: A

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75. It is easier to swim in a sea water than in ordinary water because

1. 1. Atmospheric pressure is highest at sea level

   
   
   

   2. Sea water contains salt

   
   
   

   3. Density of sea water is higher than that of ordinary water

   
   
   

   4. Density of sea water is less than that of ordinary water

   
   
   

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   N/A

   Correct Option: C

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