| 171. | If a body is 11.2 km from the earth. If thrown with a velocity per second, then the body- |
A. Never return to earth | |
B. Will return after 2 hours | |
C. Will return after 24 hours | |
D. Not certain |
| 172. | When a stone is brought from the surface of the moon to the earth, then |
A. Its mass will change | |
B. Its volume will change, but not the mass | |
C. Both weight and mass will change | |
D. Neither mass nor weight will change |
| 173. | When a person sitting in a lift feels his weight more |
A. When the lift is coming down at high speed | |
B. When the lift is going up at high speed | |
C. Coming down at the same rate | |
D. Going up with the same velocity |
| 174. | Around the Earth: Ball dropped out of orbiting artificial satellite |
A. Will go to earth | |
B. Will go to the moon | |
C. Will fall to earth | |
D. Around the Earth: Will rotate in its orbit with the same period as the satellite |
| 175. | The direct weight of a person in a lift is less than when the lift is going- |
A. Up with acceleration | |
B. Down with acceleration | |
C. Up with the same speed | |
D. Down at the same speed |
| 176. | What is the approximate height of a synchronous satellite from the surface of the earth? |
A. 36000 KM | |
B. 42000 KM | |
C. 30000 KM | |
D. None of these |
| 177. | Tennis ball bounces higher on a hill than on the ground. Because- |
A. The air pressure is relatively less on the mountains | |
B. The ball gets lighter in the mountains | |
C. Earth’s acceleration due to gravity decreases over mountains | |
D. None of the above |
| 178. | If the gravitational force of the earth suddenly vanishes, which of the following consequences would be true? |
A. The weight of the object will be zero, but the mass will remain the same | |
B. The mass of the object will become zero, but the volume will remain the same | |
C. Both the weight and mass of the object will become zero | |
D. The mass of the object will increase |
| 179. | What fraction of Earth’s gravity is closest to the Moon’s gravity? |
A. 1/5′ | |
B. 1/4′ | |
C. 1/6′ | |
D. 1/8′ |
| 180. | Time period of pendulum |
A. Depends on mass | |
B. Depends on length | |
C. Depends on the temperature | |
D. Depends on time |