Page-5 |
|||
Gen. Science |
|||
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. | ||
Answer : | |||
|
|||
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 : | |||
|
|||
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 : | |||
|
|||
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. | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|
|||
63)In a sprayer the liquid rises in the tube due to | |||
capillarity | evaporation | ||
lower pressure at the upper end | none of these | ||
Answer : | |||
|
|||
|
|||
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 | ||
Answer : | |||
|
|||
65)Tee study of science dealing with the phenomena at at very low temperatures is known as | |||
refrigenics | cytrogenics | ||
frozenics | cryogenics | ||
Answer : | |||
|
|||
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 : | |||
|
|||
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 | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|
|||
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 | ||
Answer : | |||
|