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Gen. Science |
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1)The universal law of gravitation was propounded by - | |||
Kepler | Galileo | ||
Newton | Copernicus | ||
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2)The gravitational force with which the sun attracts the earth | |||
is less than the force with which the earth attracts the sun. | is same as the force with which the earth attracts the sun. | ||
is more than the force with which the earth attracts the sun. | is constant throughout the year. | ||
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3)If the distance between the earth and the sun were twice what it is now, the gravitational force exerted on the earth by the sun would be | |||
twice as large as now | four times as large as it is now | ||
half of what it is now | one-fourth of what it is now | ||
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4)The weight of a body is | |||
the same everywhere on the surface of the earth. | maximum at the pole. | ||
maximum at the equator. | more on the hills than in the plains. | ||
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5)Let WP and WE be the weights of a body at the pole and at the equator respectively. If the earth were not rotating then | |||
WP would be more | WP would remain unchanged | ||
WE would remain unchanged | WE would be less | ||
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6)A person weighs more in a lift, which is | |||
moving up with constant velocity | moving down with constant velocity | ||
accelerating upward | accelerating downward | ||
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7)A body is taken from the earth to the moon | |||
its mass will be different but weight will remain the same | its mass will remain the same but weight will be different | ||
both mass and weight will be different | its mass and weight will be different | ||
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8)One finds it more difficult to walk on ice than on a concrete road because | |||
the friction between the ice and the feet is less than that between the concrete and feet | ice is soft and spongy where as concrete is hard | ||
there is more friction on the ice than on concrete | none of these | ||
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9)It is easier to roll a barrel than to pull it because | |||
the full weight of the barrel comes into play when it is pulled | the surface area of the barrel in contact with the road is more in case of pulling | ||
rolling friction is much less than sliding friction | None of these | ||
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10)When velocity is doubled | |||
acceleration is doubled | momentum is doubled | ||
kinetic energy is doubled | potential energy is doubled | ||
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11)The work done in holding a weight of 20kg at a height of 1m above the ground is | |||
200J | 20J | ||
Zero | None of these | ||
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12)When the speed of a body is doubled, its kinetic energy becomes | |||
quadruple | double | ||
half | None of these | ||
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