Waves — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#57 The frequency of a sound wave is 1000 Hz. The wavelength in water (speed = 1500 m/s) is
A) 0.15 m
B) 0.3 m
C) 1.5 m
D) 3.0 m
#58 The frequency of a sound wave is 500 Hz. The wavelength in steel (speed = 5000 m/s) is
A) 0.1 m
B) 1 m
C) 10 m
D) 100 m
#59 The intensity of a sound wave is 10\(^{-6}\) W/m\(^2\). The sound level in decibels is
A) 60 dB
B) 70 dB
C) 80 dB
D) 90 dB
#60 The intensity of a sound wave is 10\(^{-3}\) W/m\(^2\). The sound level in decibels is
A) 90 dB
B) 100 dB
C) 110 dB
D) 120 dB
#61 The sound level of a sound is 50 dB. Its intensity is
A) 10\(^{-7}\) W/m\(^2\)
B) 10\(^{-8}\) W/m\(^2\)
C) 10\(^{-9}\) W/m\(^2\)
D) 10\(^{-10}\) W/m\(^2\)
#62 The sound level of a sound is 120 dB. Its intensity is
A) 10\(^{-6}\) W/m\(^2\)
B) 10\(^{-4}\) W/m\(^2\)
C) 10\(^{-2}\) W/m\(^2\)
D) 1 W/m\(^2\)
#63 The phenomenon of beats is due to
A) Reflection
B) Refraction
C) Interference
D) Diffraction
#64 The beat frequency is equal to
A) Sum of the frequencies
B) Difference of the frequencies
C) Product of the frequencies
D) Ratio of the frequencies
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