Waves — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#49 The law of reflection states that
A) Angle of incidence = Angle of reflection
B) Angle of incidence > Angle of reflection
C) Angle of incidence < Angle of reflection
D) Angle of incidence + Angle of reflection = 90°
#50 The law of refraction is given by
A) Snell’s law
B) Hooke’s law
C) Boyle’s law
D) Charles’ law
#51 The speed of sound in air is 332 m/s at 0°C. The speed at 20°C is about
A) 343 m/s
B) 350 m/s
C) 360 m/s
D) 370 m/s
#52 The speed of sound in air is proportional to the square root of its
A) Density
B) Pressure
C) Temperature
D) Volume
#53 The speed of sound in a gas is independent of its
A) Density
B) Pressure
C) Temperature
D) All of these
#54 The speed of sound in a gas is directly proportional to the square root of its
A) Density
B) Pressure
C) Temperature
D) Volume
#55 The ratio of speed of sound in helium to that in air at the same temperature is about
A) 1:1
B) 1:2
C) 2:1
D) 3:1
#56 The frequency of a sound wave is 440 Hz. The wavelength in air at 20°C is about (speed = 343 m/s)
A) 0.78 m
B) 1.56 m
C) 3.12 m
D) 6.24 m
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