| 151. | Skating on ice shows that on increasing the pressure the melting point of ice is |
A. Increases | |
B. Happens to | |
C. Remains unchanged | |
D. First decreases then increases |
| 152. | The ball keeps on dancing in the splash of water at the intersections because- |
A. The pressure decreases as the velocity of water increases | |
B. Higher the velocity of the water the higher the pressure | |
C. Due to the surface tension of water | |
D. Due to viscosity of water |
| 153. | A heavy iceberg melts from the bottom rather than the top because- |
A. Low temperature is high | |
B. Melting point decreases due to high bottom pressure | |
C. Ice is not a real solid | |
D. None of the above |
| 154. | A person trapped in a swamp is advised to lie down because- |
A. Pressure decreases as the area increases | |
B. Greater the area the greater the pressure | |
C. There is no relation between pressure and area | |
D. For all of the above reasons |
| 155. | When two pieces of ice are pressed together, the pieces stick together because- |
A. Melting point of ice decreases due to high pressure | |
B. Melting point of ice increases due to high pressure | |
C. Melting point of ice first decreases with increase in pressure and then increases | |
D. There is no relation between pressure and melting point |
| 156. | Often, light thatched or tin roofs get blown away during strong storms because- |
A. Roofs are complex | |
B. Roofs are not taxed | |
C. The high velocity air flowing over the roof creates pressure on the roof surface and the pressure remains normal under the roof. | |
D. Thatched roofs blow away automatically in strong wind |
| 157. | Wide strips of wood or concrete are placed under the rail track so that- |
A. It can absorb shocks | |
B. How to apply fish straps correctly | |
C. Tracks stay parallel | |
D. Reduce the pressure exerted by the train |
| 158. | Sometimes blood comes out from the nose and mouth of people on the mountains, because |
A. Blood pressure increases with altitude | |
B. Blood pressure decreases with increase in altitude | |
C. Atmospheric pressure increases with increase in altitude | |
D. Atmospheric pressure decreases with increase in altitude |
| 159. | Ink comes out from fountain pen in airplane because- |
A. Air pressure decreases with increase in altitude | |
B. Air pressure increases with altitude | |
C. Air pressure remains unchanged with increase in altitude | |
D. None of the above |
| 160. | If the mass of the earth remains W and the radius decreases by 1%, then the value of g on the Earth’s scale- |
A. 0.5%’ will increase | |
B. 2%’ will increase | |
C. 0.5%’ will decrease | |
D. 2%’ will decrease |