Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

Physics questions and answers For UPSC | SSC | Rail | RRB | State PSC P28


Physics - 28

136. The closest distance at which a normal person can see an object clearly is
(A) 80 cm.
(B) 25 cm.
(C) 10 cm.
(D) 50 cm

Correct Answer: [B] 25 cm..
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137. Solar energy is produced by the process of
(A) Explosion
(B) Contraction
(C) Fusion
(D) Fission

Correct Answer: [C] Fusion.
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138. The screen of the cinema hall is always white and rough. Because light rays of all colors falling on the screen suffer
(A) refraction
(B) scattering
(C) total absorption
(D) total reflection

Correct Answer: [B] scattering.
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139. With an increase in temperature the resistance of a pure semiconductor
(A) increases
(B) decreases
(C) first increases and then decreases
(D) remains the same

Correct Answer: [B] decreases.
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140. The motion of which particle through a metallic wire is called electric current?
(A) Neutron
(B) Photon
(C) Electron
(D) Positron

Correct Answer: [C] Electron.
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