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The MCQs below are drawn from the Physics subject category.
Showing 811–820
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811
One complete round trip of the body in motion is called
A. Time period
B. Frequency
C. Displacement
D. Vibration
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Explanation
A full back-and-forth motion is called a vibration; time period is the time to complete one vibration.
812
The acceleration of a 0.2 kg bob attached to a 0.9 m string at a displacement of 0.5 m from the mean position is
A. -1.1 m s^-2
B. -7.9 m s^-2
C. -3.2 m s^-2
D. -5.4 m s^-2
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Explanation
For small angles, a = -(g/L)×x = -9.8×(0.5/0.9) ≈ -5.44 m/s^2.
813
75. In a frequency modulated wave
A. frequency varies with time
B. amplitude and frequency both are constant
C. amplitude and frequency both vary with time
D. amplitude varies with time
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Explanation
In frequency modulation (FM) the instantaneous frequency varies with the modulating signal while the amplitude remains constant.
814
A 4 m long string fixed at its ends resonate in 4 segments. The wavelength of the wave is:
A. 0.5 m
B. 0.25 m
C. 2 m
D. 4 m
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Explanation
For n = 4 segments, λ = 2L/n = 2×4 m / 4 = 2 m.
815
Which of the following represents an elastic wave?
A. Light waves
B. Radiowaves
C. Sound waves
D. X-rays
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Explanation
Elastic waves require a material medium; sound waves are mechanical (elastic) waves propagating through a medium.
816
It is possible to distinguish between transverse & longitudinal waves by studying the property of:
A. Polarization
B. Diffraction
C. Any of them
D. Interference
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Explanation
Only transverse waves can exhibit polarization while longitudinal waves cannot, so polarization distinguishes them.
817
If λ = 400 nm, its value in angstrom unit (1 Å = 10^-10 m) is given as:
A. 4 × 10^-17
B. 4 × 10^17
C. 4 × 10^3
D. 4 × 10^-3
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Explanation
400 nm = 4000 Å, which is 4 × 10^3 angstroms.
818
Which of the following medium can transmit both transverse and longitudinal waves?
A. Liquid
B. Plasma
C. Gas
D. Solid
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Explanation
Solids can support both transverse (shear) and longitudinal waves due to their rigidity, while fluids mainly support longitudinal waves.
819
Which one of the following media can transmit both transverse and longitudinal waves:
A. Solid
B. Gas
C. Liquid
D. Plasma
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Explanation
Solids can support both transverse and longitudinal waves, unlike fluids which do not support transverse shear waves.
820
Which of the following devices can be used to produce both transverse and longitudinal waves?
A. A string
B. A helical spring
C. A tuning fork
D. A ripple tank
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Explanation
A helical spring can support longitudinal pulses and, when displaced transversely, can also show transverse oscillations, so it can produce both types.
