General Awareness Practice Questions Set 21

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For India's Top Government Exams

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Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
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1 point

Water, iron, and air

Iron, air, and water

Air, water, and iron

Iron, water, and air

Materials for rain-proof coats and tents owe their water-proof properties to
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1 point

surface tension

Viscosity

specific gravity

Elasticity

Rectifiers are used to convert
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1 point

Direct current to Alternating current

Alternating current to Direct current

high voltage to low voltage

low voltage to high voltage

Magnetism at the center of a bar magnet is
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1 point

minimum

maximum

zero

minimum or maximum

Suitable impurities are added to a semiconductor depending on its use. This is done in order to
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1 point

increase its life

enable it to withstand higher voltages

increase its electrical conductivity

increase its electrical resistivity

On a rainy day, small oil films on water show brilliant colours. This is due to
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1 point

dispersion

interference

diffraction

polarization

It takes much longer to cook food in the hills than in the plains, because
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1 point

in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100℃ causing an increase in cooking time

due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100℃ and therefore water takes longer to boil

in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then both acquire the same *

1 point

velocity

momentum

acceleration

kinetic energy

Sound waves in the air are
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1 point

transverse

longitudinal

electromagnetic

polarised

Of the following properties of a wave, the one that is independent of the other is its
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1 point

amplitude

velocity

wavelength

frequency

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