In This Post we are providing Chapter-15 Waves NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON WAVES
Question 1: The property of a medium necessary for wave propagation is
- a) All of the above
- b) Elasticity
- c) Inertia
- d) Low resistance
Answer: All of the above
Question 2: The ratio of the speed of a body to the speed of sound is called
- a) Mach number
- b) Sonic index
- c) Doppler ratio
- d) Refractive index
Answer: Mach number
Question 3: Sound waves transfer
- a) both energy and momentum
- b) only energy not momentum
- c) momentum
- d) energy
Answer: both energy and momentum
Question 4: The reason for introducing Laplace correction in the expression for the velocity of sound in a gaseous medium is
- a) no change in the heat of the medium during the propagation of the sound through it
- b) no change in the temperature of the medium during the propagation of the sound through it
- c) change in the pressure of the gas due to the compression and rarefaction
- d) change in the volume of the gas
Answer: no change in the heat of the medium during the propagation of the sound through it
Question 5: Which of the following changes at an antinode in a stationary wave?
- a) Neither pressure nor density
- b) Both pressure and density
- c) Pressure only
- d) Density only
Answer: Neither pressure nor density
Question 6: What is the effect of humidity on sound waves when humidity increases?
- a) Speed of sound waves is more
- b) Speed of sound waves is less
- c) Speed of sound waves remains same
- d) Speed of sound waves becomes zero
Answer: Speed of sound waves is more
Question 7: Which of the following statements is/are correct about the standing wave?
I. In a standing wave the disturbance produce is confined to the region where it is produced.
II. In a standing wave, all the particles cross their mean position together.
III. In a standing wave, energy is transmitted from one region of space to other
- a) I and II
- b) Only II
- c) Only III
- d) I, II and III
Answer: I and II
Question 8: The rate of transfer of energy in a wave depends
- a) directly on the square of the wave amplitude and square of the wave frequency
- b) directly on the square of the wave amplitude and root of the wave frequency
- c) directly on the wave amplitude and square of the wave frequency
- d) None of these
Answer: directly on the square of the wave amplitude and square of the wave frequency
Question 9: If vibrations of a string are to be increased by a factor of two, then tension in the string must be made
- a) twice
- b) eight times
- c) half
- d) four times
Answer: twice
Question 10: The fundamental frequency of a closed end organ pipe is n. Its length is doubled and radius is halved. Its frequency will become nearly
- a) n/2
- b) n/3
- c) n
- d) 2 n
Answer: n/2
Question 11: The fundamental frequency of an organ pipe is 512 Hz. If its length is increased, then frequency will
- a) decrease
- b) increase
- c) remains same
- d) cannot be predicted
Answer: decrease
Question 12: What is the effect of increase in temperature on the frequency of sound produced by an organ pipe?
- a) increases
- b) no effect
- c) decreases
- d) erratic change
Answer: increases
Question 13: Frequencies of sound produced from an organ pipe open at both ends are
- a) even and odd harmonics
- b) only odd harmonics
- c) only even harmonics
- d) only fundamental note
Answer: even and odd harmonics
Question 14: closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has
- a) four nodes and four antinodes
- b) four nodes and three antinodes
- c) three nodes and four antinodes
- d) three nodes and three antinodes
Answer: four nodes and four antinodes
Question 15: If there are six loops for 1 m length in transverse mode of Melde’s experiment., the no. of loops in longitudinal mode under otherwise identical conditions would be
- a) 3
- b) 6
- c) 12
- d) 8
Answer: 3
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