171. A girl is swinging on a swing in the sitting position. How will the period of swing be affected if she stands up?

1. 1. The period will now be shorter

   
   
   

   2. The period will now be longer

   
   
   

   3. The period will remain unchanged

   
   
   

   4. None of the above

   
   
   

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   N/A

   Correct Option: A

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172. A simple pendulum has a time period T₁ when on the earth's surface, and T₂ when taken to height R above the earth's surface, where R is radius of the earth the value of T₂ / T₁ Is

1. 1. 1

   
   
   

   2. √2

   
   
   

   3. 4

   
   
   

   4. 2

   
   
   

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   N/A

   Correct Option: D

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173. The young's modulus for perfectly rigid body is

1. 1. Zero

   
   
   

   2. 1

   
   
   

   3. Infinite

   
   
   

   4. None of these

   
   
   

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   N/A

   Correct Option: C

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174. The plane of the orbit of an earth satellite

1. 1. Passes through the centre of the earth

   
   
   

   2. Does not pass through the centre of the earth

   
   
   

   3. May or may not pass through the centre of the earth

   
   
   

   4. Oscillates about the centre of the earth

   
   
   

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   N/A

   Correct Option: A

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175. Consider the following statements
     The escape velocity depends on
     1. Mass of the planet
     2. Mass of the particles escaping
     3. Temperature of the planet
     4. Radius of the planet
     Select the correct answer from the codes given below
     Codes :
     

1. 1. 1 and 2

   
   
   

   2. 2 and 4

   
   
   

   3. 1 and 4

   
   
   

   4. 1, 3 and 4

   
   
   

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   N/A

   Correct Option: C

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