FSC Physics MCQs Part 2 Physics Part 2 HSSC Pre Medical Pre Engineering text Book Questions first year and second-year Physics mcqs

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Mark the wrong statement.
A. a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
B. an un-accelerated frame of reference is called an inertial frame of reference
C. all the frames of reference in uniform rectilinear motion are equivalent
D. Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
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[explanation]D[/explanation]
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An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is
A. greater than one meter B. less than one meter
C. one meter D. a foolish question
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[explanation]B[/explanation]
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Tick the right statement.
A. no photo electronic emission takes place if the frequency of radiation however intense it may be is less than a certain critical value called threshold frequency
B. threshold frequency depends upon the nature of the metal surface
C. maximum energy of a photoelectron is a function of frequency rather than intensity of radiation
D. all of the above
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[explanation]D[/explanation]
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A device based on photoelectric effect is called
A. photo sensitive detection B. photo diode
C. photosynthesis D. photo cell
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[explanation]D[/explanation]
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Stopping potential for a metal surface in case of photoelectric emission depends on
A. the threshold frequency for the metal surface B. the intensity of incident light
C. the frequency of incident light and work function of the metal surface D. all of the above
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[explanation]C[/explanation]
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The existence of Ether wind was experimentally rejected by
A. equal to its rest mass B. double of its rest mass
C. infinite D. zero
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[explanation]C[/explanation]
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As the temperature of black body is raised the wavelength corresponding to maximum intensity
A. shifts towards longer wavelength B. shifts towards shorter wavelength
C. remain the same D. shifts towards longer as well as shorter wavelengths
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[explanation]B[/explanation]
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In Compton scattering the change in wave length is max if
A. angle of scattering is 90? B. angle of scattering is 60?
C. angle of scattering is 180? D. angle of scattering is zero
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[explanation]C[/explanation]
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In Davisson-Germer experiment the diffracted proton from crystal shows
A. Particle property B. Wave property
C. Light property D. Quantum property
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[explanation]B[/explanation]
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In electron microscope we use energetic particles because of
A. Penetrating power is high B. Kinetic energy is large.
C. Wavelength is very short. D. All the above reasons.
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[explanation]C[/explanation]
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