Physics - 25
121. Materials like Germanium and Silicon are called
(A) Metals
(B) Semi-conductors
(C) Insulators
(D) Conductors
(A) Metals
(B) Semi-conductors
(C) Insulators
(D) Conductors
Correct Answer: [B] Semi-conductors.
122. Absolute zero temperature is that temperature where
(A) All matter stays in the solid state.
(B) Kinetic and potential energies of molecules become equal to each other.
(C) Water freezes to ice.
(D) All molecules of matter come to rest
(A) All matter stays in the solid state.
(B) Kinetic and potential energies of molecules become equal to each other.
(C) Water freezes to ice.
(D) All molecules of matter come to rest
Correct Answer: [D] All molecules of matter come to rest.
123. Bats can fly in the dark without hitting objects because
(A) They are guided by ultrasonic waves which they produce.
(B) Of no scientific reason.
(C) They are flying mammals.
(D) Their night vision is good
(A) They are guided by ultrasonic waves which they produce.
(B) Of no scientific reason.
(C) They are flying mammals.
(D) Their night vision is good
Correct Answer: [A] They are guided by ultrasonic waves which they produce..
124. A person is moving towards a plane mirror with a speed of 1 m / sec. The image will approach the moving person will relative speed
(A) 2 m/sec.
(B) 3 m/sec.
(C) 1.5 m/sec.
(D) 1 m /sec
(A) 2 m/sec.
(B) 3 m/sec.
(C) 1.5 m/sec.
(D) 1 m /sec
Correct Answer: [A] 2 m/sec..
125. The current on a 100W, 200V electric bulb is
(A) 0.5 amp
(B) 22000 amp
(C) 2.2 amp
(D) 2.3 amp
(A) 0.5 amp
(B) 22000 amp
(C) 2.2 amp
(D) 2.3 amp
Correct Answer: [A] 0.5 amp.
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