physics MCQs – Page 36

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 Review each marked answer and report any item that may be outdated or unclear.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

701. If the volume of a gas is held constant and we increase its temperature then_______________?
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A. its pressure is constant

B. any of above

C. its pressure falls

D. its pressure rises

702. Which of the following waves have smallest velocity in vacuum?
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A. Infra-Red

B. Ultraviolet

C. Micro

D. Sound

703. Two coherent sources of light produce interference (destructive) when the phase difference between them is _________?
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A. ?

B. 2?

C. ?/4

D. ?/2

704. Which of the following is not derived quantity________?
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A. Density

B. Time

C. Area

D. Volume

705. The audio signals of TV are _____________?
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A. Frequency modulated

B. Velocity modulated

C. Amplitude modulated

D. fixe modulated

706. The unit of power is _________?
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A. watt

B. Joule

C. Pascal

D. Newton

707. To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
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A. 4

B. 2

C. 5

D. 3

708. A ball is thrown towards the earth and bounce back. During this process:
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A. Direction of Displacement and Velocity changes

B. Direction of Displacement and acceleration changes

C. Direction of Displacement, Velocity and acceleration changes

D. Direction of velocity and acceleration changes

709. The speed of light will be minimum while passing through ?
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A. Vaccum

B. Water

C. Glass

D. Air

710. Reflecting mirrors in laser is used to______________?
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A. For producing more energetic lasers

B. Further stimulation

C. Lasing more

D. All

711. An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?
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A. 4?<sup>2</sup>

B. 2?<sup>2</sup>

C. 0

D. ?2

712. We prefer mercury as a thermometric substance because______________?
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A. It opaque to light

B. Over a wide range of temperature its expansion is uniform

C. It does not stick to thermometer glass

D. All of above

713. The scales of temperature are based on two fixed points which are_________________?
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A. The temperatures of ice cold and boiling water

B. The temperatures of frozen and boiling mercury

C. The temperatures of water at 0? 100?C

D. The temperature of melting ice and boiling water at atmospheric pressure

714. A photostat machine works on _____________?
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A. electrostatic image making

B. thermal image making

C. magnetic image making

D. electromagnetic image making

715. Petrol engine is a________________?
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A. all the above

B. C.I engine

C. IC engine

D. SI engine

716. In full wave rectification the output D.C. voltage across the load is obtained for_____________?
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A. All of the above.

B. The negative half cycle of input A.C.

C. The positive half cycle of input A.C.

D. The complete cycle of input A.C.

717. Two identical metal balls with charges + 2Q and Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be_________?
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A. F

B. F/2

C. F/4

D. F/8

718. The owl can see most clearly in total darkness because:
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A. it has squint eyes

B. it has light bulbs in its eyes provided by nature

C. it produces infrasonic sounds

D. it has large eyes with orbs directed forward, giving it binocular sight

719. X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
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A. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

B. The lines in a diffraction grating cannot reflect X-rays.

C. The penetration power of X-rays is high in a diffraction grating

D. The ions in a crystal are well arranged

720. Radiation produced from TV picture tube is_____________?
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A. X-rays

B. Far infrared

C. Infrared

D. B-rays

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