Physics(General Knowledge ) Questions and answers for exam Preparation

General Knowledge

PHYSICS MCQs

Total Questions : 1565 | Page 7 of 157 pages

Question 61. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals have higher thermal capacity than plastics
plastics have a lower density than metals
metals are good conductor of heat
plastics have a higher thermal conductivity than metals

Discuss Question

Answer: Option C. -> metals are good conductor of heat
Metals are good conductor of heat.

Question 62. Radio telescopes are better than optical telescopes because

they can detect faint galaxies which no optical telescope can
they can work even in cloudy conditions
they can work during the day and night
All of the above

Discuss Question

Answer: Option D. -> All of the above
Radio telescopes are better than optical telescopes because they can detect faint galaxies which no optical telescope can, they can work even in cloudy conditions and they can work during the day and night.

Question 63. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at sea level
at the top of Mt. Everest
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

Discuss Question

Answer: Option C. -> at a place in a valley below sea level
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open at a place in a valley below sea level.

Question 64. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?

1.8 km, 0.15 km
2.2 km, 0.20 km
2.8 km, 0.25 km
3.3 km, 0.30 km

Discuss Question

Answer: Option D. -> 3.3 km, 0.30 km
3.3 km, 0.30 km.

Question 65. Intensity of sound at a point is ____ its distance from the source.

directly proportional to
inversely proportional to
directly proportional to square of
inversely proportional to square of

Discuss Question

Answer: Option D. -> inversely proportional to square of
Intensity of sound at a point is inversely proportional to square of its distance from the source.

Question 66. ML2T-2 is the dimensional formula for

moment of inertia
pressure
elasticity
couple acting on a body

Discuss Question

Answer: Option D. -> couple acting on a body
ML2T-2 is the dimensional formula for couple acting on a body.

Question 67. Solar eclipse will take place when

the sun is between the moon and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth
the moon does not lie on the line joining the sun and the earth

Discuss Question

Answer: Option C. -> the moon is between the sun and the earth
Solar eclipse will take place when the moon is between the sun and the earth.

Question 68. One watt-hour is equivalent to

6.3 x 103 J
6.3 x 10-7 J
3.6 x 103 J
3.6 x 10-3 J

Discuss Question

Answer: Option C. -> 3.6 x 103 J
One watt-hour is equivalent to 3.6 x 103 J

Question 69. Isotopes of an element contain

the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons

Discuss Question

Answer: Option A. -> the same number of protons but different number of neutrons
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

Question 70. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?

Scattering
Diffraction
Interference
Polarization

Discuss Question

Answer: Option A. -> Scattering
The Nobel Prize in Physics 1930 was awarded to Sir Chandrasekhara Venkata Raman "for his work on the scattering of light and for the discovery of the effect named after him."