Waves Sample Questions for Class 11
Question 1
A train passes a stationary observer. Which of the following best describes how the amplitude and the apparent frequency of the sound waves heard by the observer change as the train moves away?
A. Both the amplitude and the apparent frequency increase.
B. Both the amplitude and the apparent frequency decrease.
C. The amplitude of the sound waves increases, and the apparent frequency decreases.
D. The amplitude of the sound waves decreases, and the apparent frequency increases.
Question 2
Which statement best explains the difference between light waves traveling through a vacuum and light waves traveling through a medium?
A. Light waves traveling through a vacuum are transverse, but light waves traveling through a medium are longitudinal.
B. Light waves traveling through a vacuum travel faster than light waves traveling through a medium.
C. Light waves traveling through a vacuum have no mass, but light waves traveling through a medium have a mass greater than zero.
D. Light waves traveling through a vacuum have a shorter wavelength than light waves traveling through a medium.
Question 3
A musical note has a frequency of 512 Hz. If the wavelength of the note is 0.685 m, what is the speed of the sound of that note?
A. 345 m/s
B. 351 m/s
C. 841 m/s
D. 0.00120 m/s
Question 4
Which one of the following factors determines the pitch of a sound?
A. the amplitude of the sound wave
B. the distance of the sound wave from the source
C. the frequency of the sound wave
D. the wavelength of the sound wave