physics Mcqs
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