Physics MCQs

852 MCQs (Page 6 of 86)

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Which one is not an example of adiabatic process ?

A. Rapid escape of air from a burst tyre
B. Rapid expansion of air
C. Conversion of water into ice in refrigerator
D. Cloud formation in the atmosphere

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In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?

A. Mercury takes a long time to contract
B. The amount of mercury use is very small
C. The capillary tube has a small constriction near the bulb
D. The capillary tube is very narrow

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We prefer mercury as a thermometric substance because______________?

A. Over a wide range of temperature its expansion is uniform
B. It does not stick to thermometer glass
C. It opaque to light
D. All of above

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Numerical value of Boltzmanns constant is______________?

A. 1.38×10-31jk-1
B. 3.18×10-31jk-1
C. 3.18×10-23jk-1
D. 1.38×10-23jk-1

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Metabolism is the name of a process in which energy transformation takes place within______________?

A. Heat engine
B. Human body
C. Atmosphere
D. Laboratory

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

A. Equal to d.c. value
B. More than d.c. value
C. Less than d.c. value
D. Zero

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In forward bias the width of potential barrier_____________?

A. Increases
B. Decreases
C. Remains same
D. No effect

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The electronic circuits which implement the various logic operations are called_____________?

A. Logic gates
B. Boolean algebra
C. Amplifier gain
D. Logic functions

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Acceptor and donor impurities donate______________?

A. N-carriers only
B. P-carriers only
C. P-carriers and n-carriers respectively
D. N-carriers and p-carriers respectively

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An OP-AMPs can amplify_______________?

A. D.c.
B. A.c.
C. Both a.c. & d.c.
D. None of the above

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