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General Knowledge - Physics

Exercise : Physics - Section 1
  • Physics - Section 1
31.
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
density of mercury is greater than that of water
cohesion of mercury is greater than its adhesion with glass
cohesion of water is greater than its adhesion with glass
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
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 conductivity
increase its electrical resistivity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
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 with time
the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
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 in cooking time
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
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Moment of inertia is
vector
scalar
phasor
tensor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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