physics MCQs – Page 34

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 Review each marked answer and report any item that may be outdated or unclear.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
661. Unit of power of a lens is________________?
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A. watt

B. horsepower

C. diopter

D. meter

662. The projection of the particle moving in a circle with non-uniform speed executes ?
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A. S.H.M

B. Vibratory motion

C. Both B and D

D. None S.H.M

663. The symbol of the prefix used for Mega is_______?
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A. h

B. M

C. E

D. G

664. The work done in the isochoric process is________________?
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A. depends on situation

B. variable

C. zero

D. constant

665. X-rays are similar in nature to_______________?
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A. ?-rays

B. Positive rays

C. Cathode rays

D. Beta rays

666. The metastable state for an atom in laser light is_____________?
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A. 10-8 sec

B. 10-5 sec

C. 10-3 sec

D. 10-4 sec

667. UV radiation can be produced by______________?
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A. Electron excitation in the gas

B. Ionization of atoms

C. All the above

D. Heating the filament

668. The turning effect of force is called_________?
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A. Moment

B. Momentum

C. Torque

D. None of these

669. p-n junction when reversed biased acts as a_______________?
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A. capacitor

B. on switch

C. off switch

D. inductor

670. A Circle has a number of tangents equal to _________?
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A. 1

B. Infinite

C. 0

D. 2

671. Which one is not an example of adiabatic process ?
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A. conversion of water into ice in refrigerator

B. rapid expansion of air

C. cloud formation in the atmosphere

D. rapid escape of air from a burst tyre

672. Numerical value of Boltzmanns constant is______________?
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A. 3.1810-31JK-1

B. 3.1810-23JK-1

C. 1.3810-23JK-1

D. 1.3810-31JK-1

673. In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
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A. Equal to D.C. value

B. Less than D.C. value

C. Zero

D. More than D.C. value
674. We can produce heat by________________?
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A. All of the above

B. Chemical processes

C. Electrical processes

D. Frictional process

675. Identify the correct statement about minority carriers_____________?
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A. holes in n-type and free electrons in p-type

B. holes in n-type and p-type

C. free electrons in n-type and p-type

D. free electrons in n-type and holes in p-type

676. A force On particle is conservative if:________?
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A. It work depends on the end points of every motion, not on the path between.

B. Its obeys Newtons third law

C. Its obeys Newtons second law

D. Its works equals the change in the kinetic energy of the particle.

677. A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point is
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A. Zero

B. E

C. E/2

D. E/(2)<sup>1/2</sup>

678. The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?
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A. Solar cells.

B. The photo diodes

C. The switch

D. The light emitting diode
679. A Stone thrown from the top of a tall building follows a path that is:
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A. Hyperbolic

B. Made of two straight line segments

C. Circular

D. Parabolic
680. The specially designed semi-conductor diodes used as fast counters in electronic circuits are_______________?
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A. Photo diodes

B. The light emitting diodes

C. Photo voltaic cell

D. Solar cells.