51. The angle of contact of a liquid with a solid does not depend on

1. 1. The angle of inclination of t he solid to the solid-liquid surface

   
   
   

   2. The nature of the liquid and the solid

   
   
   

   3. The medium which exists above the free surface of the liquid

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: A

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52. A spherical body moves with uniform angular velocity (ω)around a circular path of radius r. Which one of the following statements

1. 1. the body has no acceleration

   
   
   

   2. The body has a radial acceleration ω² r directed toward centre of path

   
   
   

   3. The body has a radial acceleration 2 / 5 ω² r Directed away from the centre of the path

   
   
   

   4. The body has an acceleration ω² tangential to its path

   
   
   

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   N/A

   Correct Option: B

   N/A

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53. If want to calculate the pressure of a liquid at the bottom of vessel, the quantity which is not required to determine it, is

1. 1. Height of the liquid column

   
   
   

   2. Surface area of the bottom of the vessel

   
   
   

   3. Density of the liquid

   
   
   

   4. Acceleration due to gravity at the bottom of the vessel

   
   
   

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   N/A

   Correct Option: B

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54. The excess of pressure inside a drop or bubble is

1. 1. Directly proportional to its mass

   
   
   

   2. Directly proportional to its radius

   
   
   

   3. Inversely proportional to its radius

   
   
   

   4. Inversely proportional to its surface tension

   
   
   

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   N/A

   Correct Option: C

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55. A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is

1. 1. Zero at that earth is

   
   
   

   2. Is balanced by the force of attraction due to moon

   
   
   

   3. Equal to centripeated force

   
   
   

   4. Non-effective due to particular design of the satelltie

   
   
   

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   N/A

   Correct Option: A

   N/A

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