General Knowledge

Physics - Section 1

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Physics - Section 1

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Question 41
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

A
Pressure and Young's modules
B
Planck's constant and Angular momentum
C
Impulse and moment of force
D
Force and rate of change of linear momentum
Correct Answer: Option C

No answer description available for this question.

Question 42
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same

A
velocity
B
momentum
C
acceleration
D
kinetic energy
Correct Answer: Option B

No answer description available for this question.

Question 43
Pick out the scalar quantity

A
force
B
pressure
C
velocity
D
acceleration
Correct Answer: Option B

No answer description available for this question.

Question 44
Rectifiers are used to convert

A
Direct current to Alternating current
B
Alternating current to Direct current
C
high voltage to low voltage
D
low voltage to high voltage
Correct Answer: Option B

No answer description available for this question.

Question 45
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because

A
mercury is a metal
B
density of mercury is greater than that of water
C
cohesion of mercury is greater than its adhesion with glass
D
cohesion of water is greater than its adhesion with glass
Correct Answer: Option C
Question 46
Suitable impurities are added to a semiconductor depending on its use. This is done in order to

A
increase its life
B
enable it to withstand higher voltages
C
increase its electrical conductivity
D
increase its electrical resistivity
Correct Answer: Option C

No answer description available for this question.

Question 47
Stars twinkle because

A
the intensity of light emitted by them changes with time
B
the distance of the stars from the earth changes with time
C
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
D
the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
Correct Answer: Option C

No answer description available for this question.

Question 48
It takes much longer to cook food in the hills than in the plains, because

A
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
B
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
C
density is low and therefore a lot of heat is lost to the atmosphere
D
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
Correct Answer: Option A

No answer description available for this question.

Question 49
Moment of inertia is

A
vector
B
scalar
C
phasor
D
tensor
Correct Answer: Option D

No answer description available for this question.

Question 50
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?

A
Rainbow
B
Earthshine
C
Halo
D
Mirage
Correct Answer: Option D

No answer description available for this question.

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