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The MCQs below are drawn from the Physics subject category.
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691
When amplitude of a wave becomes double, its energy becomes
A. zero
B. double
C. 6 times
D. 4 times
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Explanation
Energy carried by a wave is proportional to the square of its amplitude, so doubling amplitude increases energy by 4×.
692
One mach number is equal to
A. velocity of sound
B. 1 km s^-1
C. 1 m s^-1
D. velocity of light
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Explanation
Mach number is defined as the ratio of an object's speed to the speed of sound; one Mach equals the speed of sound.
693
Which effect produces ultrasonics in quartz?
A. Hall effect
B. Magnetostriction effect
C. Piezoelectric effect
D. Pyroelectric effect
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Explanation
Quartz generates ultrasonic vibrations by the piezoelectric effect, where applied electric fields cause mechanical deformation.
694
The locus of all points in a medium having the same phase of vibration is called
A. wavelength
B. trough
C. crest
D. wavefront
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Explanation
Points with the same phase form a wavefront; crest and trough are specific phase positions, not the locus.
695
The nodal points are:
A. Never at rest
B. Always at rest
C. Sometimes at rest sometimes not
D. None of these
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Explanation
Nodes are points of zero displacement in standing waves and therefore remain at rest.
696
What is a second's pendulum ?
A. A pendulum which completes one vibration in one second.
B. A pendulum which completes two vibrations in one second.
C. A pendulum which completes one vibration in two seconds.
D. None of the above.
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Explanation
A seconds pendulum has a period of two seconds, so it completes one full vibration in two seconds.
697
The process of waves appearing with different intensity at a point where a number of waves pass through a point in a medium is known as
A. Refraction
B. Diffraction
C. Interference
D. Polarization
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Explanation
Interference is the phenomenon where superposition of waves leads to variations in resultant intensity at a point.
698
A wave travelling with speed of 130 m/s having wavelength of 5 m. What is its frequency:
A. 650 Hz
B. 20 Hz
C. 3.8 × 10^2 Hz
D. 26 Hz
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Explanation
f = v/λ = 130 / 5 = 26 Hz.
699
The wavelength is the distance along the line of wave propagation between two successive particles which have equal
A. displacements
B. amplitude
C. velocities
D. phases
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Explanation
Wavelength corresponds to the distance between points that are in the same phase of oscillation.
700
Which of the following are examples of transverse and a longitudinal wave?
A. Light and sound waves
B. Light and water ripples
C. Radio and light waves
D. Radio and sound waves
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Explanation
Light is a transverse electromagnetic wave and sound is a longitudinal mechanical wave, so the pair light and sound exemplifies transverse and longitudinal waves.
