(b) in the air of 100°C
   (c) in the water
   (d) in the wood
Ans: (d)
249. If a tunnel is made along the diameter of the earth and a piece of stone is
   gently released then:
   (a) it will execute SHM
   (b) it will execute periodic motion
   (c) there is no specific motion
   (d) None of these
Ans: (a)
250. The time period of the revolution of the geostationary satellite around the
   earth is :
   (a) equal to that of the earth
   (b) twice that of the earth
   (c) equal to that of the moon
   (d) None of the above
Ans: (a)
251. The escape velocity of anybody on the earth"s surface is equal to how
   many times the orbital velocity of the same body on the earth"s surface:
   (a) 2 times
   (b) 2 times
   (c) 3 times
   (d) No any relations exists
Ans: (b)
252. If a body is revolving around the earth"s orbit with its usual velocity, then
   what would be the minimum energy required to let it escape from the orbit:
   (a) double of its orbiting energy
   (b) 2 of its orbiting energy
   (b) triple of its orbiting energy
   (c) None of these
Ans: (a)