General Knowledge

Physics - Section 1

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Physics - Section 1

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10 Questions
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Question 31
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to

A
the heating effect of current alone
B
hysteresis loss alone
C
both the heating effect of current and hysteresis loss
D
intense sunlight at noon
Correct Answer: Option C

No answer description available for this question.

Question 32
Nuclear sizes are expressed in a unit named

A
Fermi
B
angstrom
C
newton
D
tesla
Correct Answer: Option A

Fermi - A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.

Question 33
Light year is a unit of

A
time
B
distance
C
light
D
intensity of light
Correct Answer: Option B

No answer description available for this question.

Question 34
Mirage is due to

A
unequal heating of different parts of the atmosphere
B
magnetic disturbances in the atmosphere
C
depletion of ozone layer in the atmosphere
D
equal heating of different parts of the atmosphere
Correct Answer: Option A

No answer description available for this question.

Question 35
Light from the Sun reaches us in nearly

A
2 minutes
B
4 minutes
C
8 minutes
D
16 minutes
Correct Answer: Option C

No answer description available for this question.

Question 36
Stars appears to move from east to west because

A
all stars move from east to west
B
the earth rotates from west to east
C
the earth rotates from east to west
D
the background of the stars moves from west to east
Correct Answer: Option B

No answer description available for this question.

Question 37
Pa(Pascal) is the unit for

A
thrust
B
pressure
C
frequency
D
conductivity
Correct Answer: Option B

No answer description available for this question.

Question 38
Planets do not twinkle because

A
they emit light of a constant intensity
B
their distance from the earth does not change with time
C
they are very far away from the earth resulting in decrease in intensity of light
D
they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
Correct Answer: Option D

No answer description available for this question.

Question 39
Metals are good conductors of electricity because

A
they contain free electrons
B
the atoms are lightly packed
C
they have high melting point
D
All of the above
Correct Answer: Option A

No answer description available for this question.

Question 40
Let a thin capillary tube be replaced with another tube of insufficient length then, we find water

A
will overflow
B
will not rise
C
depressed
D
change its meniscus
Correct Answer: Option B

No answer description available for this question.

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