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General Science
➤ Physics ➤ 1
Question 81
Q81.
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
mercury is a metal
cohesion of mercury is greater than its adhesion with glass
density of mercury is greater than that of water
cohesion of water is greater than its adhesion with glass
Question 82
Q82.
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
increase its life
enable it to withstand higher voltages
increase its electrical resistivity
increase its electrical conductivity
Question 83
Q83.
Stars twinkle because
the intensity of light emitted by them changes with time
the distance of the stars from the earth changes with time
the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes
the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
Question 84
Q84.
It takes much longer to cook food in the hills than in the plains, because
in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC 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
Question 85
Q85.
Moment of inertia is
vector
tensor
scalar
phasor
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