Waves — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#65 Two tuning forks have frequencies 256 Hz and 260 Hz. The beat frequency is
A) 2 Hz
B) 4 Hz
C) 6 Hz
D) 8 Hz
#66 The Doppler effect is the change in
A) Frequency due to relative motion
B) Amplitude due to relative motion
C) Wavelength due to relative motion
D) Speed due to relative motion
#67 When a source of sound moves towards a stationary observer, the apparent frequency is
A) Higher than the actual frequency
B) Lower than the actual frequency
C) Equal to the actual frequency
D) Sometimes higher, sometimes lower
#68 When an observer moves towards a stationary source of sound, the apparent frequency is
A) Higher than the actual frequency
B) Lower than the actual frequency
C) Equal to the actual frequency
D) Sometimes higher, sometimes lower
#69 The speed of sound in air at 0°C is 332 m/s. The speed at 30°C is about
A) 349 m/s
B) 359 m/s
C) 369 m/s
D) 379 m/s
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