physics MCQs – Page 43

Practise multiple-choice questions from physics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

physics Mcqs
841. By how many times are the Electrostatic forces stronger than the Gravitational Forces for a fixed distance?
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A. None of these

B. 10<sup>12</sup>

C. 1036

D. 10<sup>2</sup>

842. In half-wave rectification the output D.C. voltages is obtained across the load for_______________?
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A. The positive and negative half cycles

B. Either positive or negative half of A.C.

C. The positive half cycle of A.C.

D. The negative half cycle of A.C.

843. An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
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A. Angular Displacement

B. Angular Momentum

C. Linear Velocity

D. None of the above

844. Which of the following are not deflected by electric and magnetic fields ?
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A. Gamma rays

B. Alpha rays

C. None of these

D. Beta rays

845. Mach number is used in connection with the speed of___________?
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A. Light

B. Sound

C. aircraft

D. Ship

846. Normal human body temperature 98.6F corresponds to______________?
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A. 42C

B. 55C

C. 410C

D. 37C
847. At constant temperature the graph between V and 1/P is_____________?
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A. A curve of any shape

B. A straight lime

C. Hyperbola

D. Parabola

848. With the increase of pressure, the boiling point of any substance:
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A. Becomes Zero

B. Remains same

C. Increases

D. Decreases

849. In an electronic transition atom cannot emit______________?
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A. Infra red radiation

B. Ultraviolet rays

C. Visible light

D. ?-rays
850. A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.
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A. The resistance of copper decreases and that of germanium increases.

B. The resistance of copper increases and that of germanium decreases

C. The resistance of each of them increases.

D. The resistance of each of them decreases.

851. If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?
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A. 1/8th

B. None of these

C. 1/10th

D. 1/6th

852. The alternating voltage is an example of_______________?
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A. Discrete waveform

B. A digital waveform

C. An analogue waveform

D. None at all

853. Name the SI unit having the symbol cd?
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A. Candela

B. Ampere

C. Second

D. Cm

854. The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine_______________?
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A. averagely

B. at any instant

C. during its operation

D. during one cycle
855. In bringing an electron towards the second electron, the electrostatic potential energy of the system
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A. Decreases

B. increases

C. remains the same

D. becomes zero

856. Which one of following band is completely filled in case of conductors ?
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A. Valence band

B. Forbidden band

C. Fermi band

D. Conduction band
857. The velocity of laser light is___________________?
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A. More than ordinary light

B. Less than ordinary light

C. Equal to ordinary light

D. Different for different colours or frequency