Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

Physics question bank pdf For UPSC | SSC | Rail | RRB | State PSC | NEET P19


Physics - 19

91. RADAR is used for
(A) Locating geostationary satellites.
(B) detecting and locating the position of objects such as an airplane.
(C) locating submerged submarines.
(D) receiving signals in a radio receiver

Correct Answer: [B] detecting and locating the position of objects such as an airplane..
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92. Focussing in a camera is carried out by varying
(A) The distance of the lens from the object.
(B) The speed of the shutter.
(C) The amount of light
(D) The distance of the lens from the film

Correct Answer: [D] The distance of the lens from the film.
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93. The approximate intensity level of sound in dB which can causes damage to the eardrum is
(A) 140 dB
(B) 130 dB
(C) 120 dB
(D) 160 Db

Correct Answer: [A] 140 dB.
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94. The process of joining two or more blocks of ice by pressing each other is called
(A) Regelation
(B) Radiation
(C) Refrigeration
(D) None of the above

Correct Answer: [A] Regelation.
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95. The surface of the water in a lake is going to freeze. The temperature of water at the bottom is
(A) 4°C
(B) 0°C
(C) More than 4°C
(D) Less than 4°C

Correct Answer: [A] 4°C.
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