PG TRB Physics Study Materials 2020 - 2021 - 1
Question: 1
Which one among the following satellites is used to reflect the radio signals back to the Earth?
(A) Active satellite
(B) Passive satellite
(C) Natural satellite
(D) None of these
Ans: B
Passive satellite
Question: 2
Who invented the laser?
(A) Sir Frank Whittle
(B) Charles H. Townes
(C) Fred Morrisson
(D) Seymour Cray
Ans: B
Charles H. Townes
Question: 3
Lumen is the unit of
(A) Luminous flux
(B) Luminous intensity
(C) Both
(D) None of these
Ans: A
Luminous flux
Question: 4
Rain drops assume spherical shape due to
(A) Gravitational force
(B) Centripetal force
(C) Centrifugal force
(D) Surface tension
Ans: D
Surface tension
Question: 5
The maximum displacement of a particle in the upward direction is
(A) Node
(B) Crest
(C) Wavelength
(D) Trough
Ans: B
Crest
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