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
(A) 80 cm.
(B) 25 cm.
(C) 10 cm.
(D) 50 cm
Correct Answer: [B] 25 cm..
137. Solar energy is produced by the process of
(A) Explosion
(B) Contraction
(C) Fusion
(D) Fission
(A) Explosion
(B) Contraction
(C) Fusion
(D) Fission
Correct Answer: [C] Fusion.
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
(A) refraction
(B) scattering
(C) total absorption
(D) total reflection
Correct Answer: [B] scattering.
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
(A) increases
(B) decreases
(C) first increases and then decreases
(D) remains the same
Correct Answer: [B] decreases.
140. The motion of which particle through a metallic wire is called electric current?
(A) Neutron
(B) Photon
(C) Electron
(D) Positron
(A) Neutron
(B) Photon
(C) Electron
(D) Positron
Correct Answer: [C] Electron.
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