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The MCQs below are drawn from the Physics subject category.
Showing 1041–1050
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1041
In solids and liquids, the variation of the speed of sound with temperature is
A. slightly less than in air
B. small and usually negligible
C. the same as in air
D. much greater than in air
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Correct Option
Explanation
In solids and liquids the effect of temperature on sound speed is generally small and often negligible compared to gases.
1042
The speed of sound is maximum through which of the following medium?
A. Water
B. Glass
C. Air
D. Wood
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Explanation
Sound travels fastest in solids (of the listed media, glass) because particles are more closely packed, facilitating faster propagation.
1043
Stationary waves are produced when two identical waves are moving on the string
A. along the same direction
B. along the opposite direction
C. along the perpendicular direction
D. of length 1m
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Explanation
Stationary (standing) waves form from the superposition of two identical waves traveling in opposite directions on a string.
1044
A train blowing its whistle moves with constant velocity v away from an observer on the ground. The ratio of the natural frequency of the whistle to that measured by the observer is found to be 1.2. If the train is at rest and the observer moves away from it at the same velocity, this ratio would be given by
A. 2.05
B. 1.25
C. 1.52
D. 0.51
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Explanation
From Doppler: moving source gives f/f' =1+v/v_s =1.2 so v/v_s=0.2; moving observer case gives f/f' =1/(1 - v/v_s)=1/0.8=1.25, option B.
1045
Frequencies less than 120 Hz are known as
A. infrared
B. supersonics
C. ultrasonics
D. infrasonics
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Explanation
Frequencies below the typical audible range are termed infrasonics; among options, 'infrasonics' corresponds to low-frequency sounds.
1046
Quality of sound depends on
A. loudness
B. timbre
C. frequency
D. intensity
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Explanation
Quality (or timbre) distinguishes different sound sources having the same pitch and loudness, so timbre is the correct attribute.
1047
The distance covered by sound waves in air at 0°C in the time of 0.1 seconds is:
A. 33.2 m
B. 3.32 m
C. 332 m
D. 3320 m
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Explanation
With speed 332 m/s at 0°C, distance = vt = 332 × 0.1 = 33.2 m.
1048
A supersonic plane flies with the speed of:
A. Less than the speed of sound
B. Equal to the speed of sound
C. Greater than the speed of sound
D. None of these
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Explanation
Supersonic denotes motion faster than the speed of sound, so the plane's speed is greater than sound speed.
1049
The water level (surface) in the tube of resonance apparatus serves as:
A. Node
B. None of them
C. Anti-node
D. Both of them
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Explanation
The OCR shows a mark adjacent to 'Node', indicating the water surface acts as a node (pressure node) in the resonance tube.
1050
On loading the prong of a tuning fork with wax, its frequency
A. increases
B. remains unchanged
C. may increase or decrease
D. decreases
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Explanation
Adding mass to the prong lowers its natural frequency, so the frequency decreases.
