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| 57)Which one of the following statements is correct? | |||
| All bases are alkalis. | None of the bases is alkali. | ||
| There are no more bases except the alkalis. | All alkalis are bases but all bases are not alkalis. | ||
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| 58)A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel, having half the area of cross-section of the bottom, the pressure on the bottom will | |||
| remain same. | be reduced to half the earlier pressure. | ||
| be double the earlier pressure. | be reduced to one fourth the earlier pressure. | ||
| Answer : | |||
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| 59)The time period of a simple pendulum having a spherical wooden bob is 2sec. If the bob is replaced by a metalic one twice as heavy, the time period will be | |||
| more than 2sec. | 2sec. | ||
| less than 2sec. | 1sec. | ||
| Answer : | |||
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| 60)Which one of the following statements about an atom is not correct? | |||
| Atoms always combine to form molecules. | Atoms are the basic units from which molecules and ions are formed. | ||
| Atoms are always neutral in nature. | Atoms aggregate in large numbers to form the matter that we can see, feel and touch. | ||
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| 61)The swing of a spinning cricket ball in the air can be explained on the basis of | |||
| sudden change in wind direction | buoyancy of air | ||
| turbulence caused by wind | Bernoulli\'s theorem | ||
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| 62)A train past a railway station at a high speed. A boy standing on the edge of the platform is likely to | |||
| remain unaffected | fall away from the train | ||
| fall towards the train | none of these | ||
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| 63)In a sprayer the liquid rises in the tube due to | |||
| capillarity | evaporation | ||
| lower pressure at the upper end | none of these | ||
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| 64)A football bounces when it falls on the ground because | |||
| it is made up of rubber | it hollow | ||
| it is very light and is able to overcome the resistance of air | of the of elasticity | ||
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| 65)Tee study of science dealing with the phenomena at at very low temperatures is known as | |||
| refrigenics | cytrogenics | ||
| frozenics | cryogenics | ||
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| 66)In cold countries alcohol is preferred to mercury as a thermometric liquid because | |||
| alcohol is better conductor of heat | alcohol can be coloured and its level seen easily | ||
| alcohol has a very low freezing point | alcohol is cheaper than mercury | ||
| Answer : | |||
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| 67)On heating a circular metallic disc with a circular hole at the centre, the diameter of the hole will | |||
| dicrease | remain the same | ||
| increase | first increase then decrease | ||
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| 68)A certain mass of liquid is heated in a glass flask | |||
| the density of the liquid remain unchanged | the liquid level starts rising at once | ||
| the liquid level falls at first and then starts rising | the density of the liquid increases | ||
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| 69)When a cube of floating ice melts in a beaker the water level in the beaker will | |||
| rise | fall | ||
| remain same | none of these | ||
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| 70)The temperature of the top of a frozen lake is -15 degree Celsius. What is the temperature of the water in the lake in contact with the ice layer? | |||
| 0 degree Celsius | 4 degree Celsius | ||
| -15 degree Celsius | -7.5 degree Celsius | ||
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| 71)Fish can survive in a frozen lake because | |||
| fish is warm blooded animal | fish hibernates in ice | ||
| water near the bottom of the lake does not freeze | ice is a good conductor of heat | ||
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