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Practice each question, then open the answer or worked solution.
Water waves produced by a motorboat sailing in water are
a) neither longitudinal nor transverse
b) both longitudinal and transverse
c) only longitudinal
d) only transverse
The correct answer is b) both longitudinal and transverse
Sound waves of wavelength λ travelling in a medium with a speed of v m/s enter into another medium where its speed is 2v m/s. The wavelength of sound waves in the second medium is
a) λ
b) λ/2
c) 2 λ
d) 4 λ
The correct answer is c) 2 λ
Speed of sound wave in air
a) is independent of temperature
b) increases with pressure
c) increases with an increase in humidity
d) decreases with an increase in humidity
The correct answer is c) increases with an increase in humidity
Change in temperature of the medium changes
a) frequency of sound waves
b) amplitude of sound waves
c) wavelength of sound waves
d) loudness of sound waves
The correct answer is c) wavelength of sound waves
With the propagation of longitudinal waves through a medium, the quantity transmitted is
a) matter
b) energy
c) energy and matter
d) energy, matter, and momentum
The correct answer is b) energy
Which of the following statements are true for wave motion?
The correct answer is c) mechanical transverse waves can propagate through solids only
A sound wave is passing through the air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,
a) density remains constant
b) Boyle’s law is obeyed
c) bulk modulus of air oscillates
d) there is no transfer of heat
The correct answer is d) there is no transfer of heat
Equation of a plane progressive wave is given by y = 0.6 sin 2π(t-x/2). On reflection from a denser medium, its amplitude becomes 2/3 of the amplitude of the incident wave
a) y = 0.6 sin 2π(t+x/2)
b) y = -0.4 sin 2π(t+x/2)
c) y = 0.4 sin 2π(t+x/2)
d) y = -0.4 sin 2π(t-x/2)
The correct answer is b) y = -0.4 sin 2π(t+x/2)
A string of mass 2.5 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, the disturbance will reach the other end in
a) one second
b) 0.5 second
c) 2 seconds
d) data given is insufficient
The correct answer is b) 0.5 second
A train whistling at constant frequency is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency n’ of the sound as heard by the observer is plotted as a function of time t. Identify the expected curve
The correct answer is c)
