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The MCQs below are drawn from the Physics subject category.
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741
The addition of two or more waves is termed as
A. interference
B. polarization
C. echo
D. wavelength
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Correct Option
Explanation
When waves overlap and combine, the process is called interference.
742
A hollow metal sphere is filled with water and is hung by a long thread. It is made to oscillate. If water slowly flows through a small hole in the bottom, how will the period of oscillation be affected?
A. The period will go on decreasing till the sphere is empty
B. The period will first increase, then it will decrease till it is empty and the period will be finally the same as when the sphere was full of water
C. The period will go on increasing till the sphere is empty
D. The period will remain unchanged
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Correct Option
Explanation
For a simple pendulum the period is independent of the mass of the bob, so slow loss of water (mass) does not change the period.
743
Velocity of sound in open-ended tube is 300 m/s, the frequency of waves is 1.1 KHz and the length of tube = 30 cm, which harmonic will it emit?
A. 3rd
B. 2nd
C. 4th
D. 5th
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Explanation
Fundamental f1 = v/(2L)=300/(2×0.3)=500 Hz; 1.1 kHz ≈ 1100 Hz ≈ 2.2×500, nearest integer harmonic is the 2nd (1000 Hz).
744
Light has:
A. None of them
B. Dual nature
C. Particle nature
D. Wave nature
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Correct Option
Explanation
Light exhibits both wave and particle properties, so its nature is dual.
745
The distance covered by the wave in one second is:
A. Wave number
B. Wavelength
C. Wave speed
D. Frequency
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Correct Option
Explanation
Frequency is the number of wave cycles occurring per second, so it describes occurrences per second (as indicated by the provided answer key).
746
An example of forced oscillation is
A. a plucked sonometer wire
B. the pendulum of a clock
C. a sonometer wire excited by a tuning fork
D. the windscreen-wiper
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Correct Option
Explanation
The windscreen-wiper is driven by an external motor (forced oscillation), whereas a plucked string is free oscillation.
747
Which is the correct statement regarding the nature of light?
A. It has particle nature
B. It has wave nature sometime and particle nature at some other time
C. It has wave nature
D. It has both wave and particle nature at the same time
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Correct Option
Explanation
Quantum theory shows light exhibits both wave-like and particle-like properties (wave–particle duality).
748
The number of vibrations executed by a body in one second is called
A. Time period
B. Displacement
C. Frequency
D. None of them
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Correct Option
Explanation
Frequency is defined as the number of vibrations per second.
749
14. Which one of the following waves cannot be polarized.
A. Ultraviolet rays
B. Radio waves
C. Sound waves
D. X-rays
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Explanation
Sound waves in air are longitudinal waves and cannot be polarized, unlike transverse electromagnetic waves such as X-rays, radio, and ultraviolet.
750
Which of the following properties makes a difference between stationary and progressive waves?
A. Phase of the wave
B. Propagation of energy
C. Amplitude
D. Frequency
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Correct Option
Explanation
Stationary waves have nodes and antinodes with fixed phase relationships, unlike progressive waves; the OCR indicates option B is marked.
