General Knowledge

Physics - Section 1

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Physics - Section 1

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Question 61
Superconductors are substances which

A
conduct electricity at low temperature
B
offer high resistance to the flow of current
C
offer no resistance to the flow of electricity
D
conduct electricity at high temperatures
Correct Answer: Option C

No answer description available for this question.

Question 62
Radio telescopes are better than optical telescopes because

A
they can detect faint galaxies which no optical telescope can
B
they can work even in cloudy conditions
C
they can work during the day and night
D
All of the above
Correct Answer: Option D

No answer description available for this question.

Question 63
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

A
X-rays
B
ultraviolet light
C
visible light
D
radio waves
Correct Answer: Option C

No answer description available for this question.

Question 64
Out of the following pairs, which one does not have identical dimension?

A
Moment of inertia and moment of a force
B
Work and Torque
C
Angular momentum and Planck's constant
D
Impulse and Momentum
Correct Answer: Option A

No answer description available for this question.

Question 65
Mercury is commonly used as a thermometric fluid rather than water because

A
specific heat of mercury is less than water
B
specific heat of mercury is more than water
C
mercury has greater visibility than water
D
density of mercury is more than the water
Correct Answer: Option C

No answer description available for this question.

Question 66
Optical fibre works on the
A
principle of refraction
B
total internal reflection
C
scattering
D
interference
Correct Answer: Option B

No answer description available for this question.

Question 67
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

A
4.2 seconds
B
42 seconds
C
4.2 years
D
42 years
Correct Answer: Option C

No answer description available for this question.

Question 68
Solar eclipse will take place when

A
the sun is between the moon and the earth
B
the earth is between the moon and the sun
C
the moon is between the sun and the earth
D
the moon does not lie on the line joining the sun and the earth
Correct Answer: Option C

No answer description available for this question.

Question 69
Isotopes of an element contain

A
the same number of protons but different number of neutrons
B
the same number of neutrons but different number of protons
C
equal number of protons and electrons
D
equal number of nucleons
Correct Answer: Option A

No answer description available for this question.

Question 70
One watt-hour is equivalent to

A
6.3 x 103 J
B
6.3 x 10-7 J
C
3.6 x 103 J
D
3.6 x 10-3 J
Correct Answer: Option C

No answer description available for this question.

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