Physics MCQs

852 MCQs  (Page 17 of 86)

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For normal adjustment, length of astronomical telescope is______________?
A. Fo + fe
B. Fo – fe
C. Fo / fe
D. Fe / fo
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A photon of wavelength 900nm behaves like a particle of mass______________?
A. 5.53 x 10-36kg
B. 0 kg.
C. 2.46 x 10-36kg
D. 1.84 x 10-44kg
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The velocity of a particle of mass m of de-Broglie wavelength λ is______________?
A. V = 3 ×× 106 ms-1
B. V = 2 ×× 10 ms-1
C. V = 2 ×× 6 ms-1
D. V = 2 ×× 106 ms-1
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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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If a diffraction grating is placed in the path of a light beam it reveals______________?
A. Wave property
B. Particle property
C. Energy particle
D. Electromagnetic wave property
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In an 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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In the electron microscope, electric & magnetic fields are used as_______________?
A. Electromagnetic gun
B. Source of electromagnetic waves
C. Deflecting charged particle
D. Converging source of electrons
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A three-dimensional image is obtained by________________?
A. Electron microscope
B. Scanning electron microscope
C. Magnetic imaging
D. None of the above
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The uncertainty in momentum & position is due to its_____________?
A. Property of matter and radiation
B. Two-dimensional motion
C. Emission of the certain wavelength
D. Very high velocity
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For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?
A. 107m/sec
B. Should be greater than the speed of light.
C. Be zero
D. Not be wave-like
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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