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| 13) A horse pulling a tonga moves forward due to the force exerted by | |||
| the horse on the tonga | the tonga on the horse | ||
| the horse on the ground with his feet | the ground on the horse\'s feet | ||
| Answer : | |||
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| 14) A sheet of paper can be pulled out quickly from under a glass of water without spilling the water. This due to | |||
| Newton\'s third law of motion | inertia | ||
| acceleration | lack of friction between paper and glass | ||
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| 15)Winding a watch is actually the process of storing | |||
| potential energy | kinetic energy | ||
| electromagnetic energy | electrical energy | ||
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| 16)A person having AB group of blood can donate to a person having | |||
| A group | B group | ||
| AB group | O group | ||
| Answer : | |||
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| 17)A long thread suspended from a fixed point, has a small mass swinging to and fro at its lower end. | |||
| The potential energy of the mass is maximum in the middle of the swing. | The kinetic energy is maximum in the middle of the swing. | ||
| The potential energy is always equal to the kinetic energy. | The sum of the potential and kinetic energy is maximum in the middle of the swing. | ||
| Answer : | |||
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| 18)Conservation of energy means. | |||
| Energy can be created as well as destroyed. | Energy can be created but can not be destroyed. | ||
| Energy cannot be created but can be destroyed. | Energy can neither be created nor destroyed. | ||
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| 19)A person climbing a hill bends forward in order to | |||
| avoid slipping. | increase speed | ||
| reduce fatigue. | increase stability. | ||
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| 20)The period of a geostationary satellite is | |||
| 40 hours | 24 hours | ||
| 12 hours | 36 hours | ||
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| 21)If an apple is released from an orbiting spaceship, it will | |||
| fall towards the earth | move along the spaceship at the same speed | ||
| move at the higher speed | move with lower speed | ||
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| 22)The density of sea water increases as | |||
| depth and salinity decrease | depth decreases and salinity increases | ||
| depth increases and salinity decreases | depth and salinity increase | ||
| Answer : | |||
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| 23)When a ship enters sea from a river | |||
| it rises a little | it sinks a little | ||
| it remains at the same level | it rises or sinks depending on the material it is made of | ||
| Answer : | |||
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| 24)A steel ball floats on mercury because | |||
| mercury does not allow any metal ball to sink in it. | mercury is also a metal in liquid form. | ||
| the density of mercury is higher than that of steel. | a steel ball can be made float on any liquid by suitable adjustment. | ||
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| 25)Atmospheric pressure is measured with | |||
| hydrometer | barometer | ||
| hygrometer | altimeter | ||
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| 26)The atmosphere exerts enormous pressure on us. But we do not feel it because | |||
| we are used to it. | our bones are very strong and withstand this pressure. | ||
| the surface area of our head is very small. | our blood exert a pressure slightly more than that of the atmosphere. | ||
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| 27)In barometer mercury is preferred over water because | |||
| mercury is a good conductor of heat. | mercury is shining and its level can be seen easily. | ||
| mercury is available in pure form. | mercury has high density and low vapour pressure. | ||
| Answer : | |||
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