Questions
1
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
Answer:I and II
2
Which of the following changes at an antinode in a stationary wave?
Answer:Neither pressure nor density
3
The reason for introducing Laplace correction in the expression for the velocity of sound in a gaseous medium is
Answer:no change in the heat of the medium during the propagation of the sound through it
4
The property of a medium necessary for wave propagation is
Answer:All of the above
5
What is the effect of humidity on sound waves when humidity increases?
Answer:Speed of sound waves is more
7
The ratio of the speed of a body to the speed of sound is called
Answer:Mach number
8
From a point source, if amplitude of waves at a distance r is A, its amplitude at a distance 2r will be
Answer:A/2
9
Sound travels in rocks in the form of
Answer:both longitudinal and transverse elastic waves
10
When a sound wave goes from one medium to another, the quantity that remains unchanged is
Answer:frequency
12
The rate of transfer of energy in a wave depends
Answer:directly on the square of the wave amplitude and square of the wave frequency
13
Frequencies of sound produced from an organ pipe open at both ends are
Answer:even and odd harmonics
14
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
Answer:3
15
The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both theends is
Answer: 120 cm
16
What is the effect of increase in temperature on the frequency of sound produced by an organ pipe?
Answer:increases
17
Which of the following statements are true for a stationary wave?
Answer:A, B, C, D
18
A train, standing in a station yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10m/s. Given that the speed of sound in still air is 340 m/s,
Answer:A, B
19
The transverse displacement of a string (clamped at its both ends) is given by y (x,t) = 0.06 sin (2πx/3) cos (120πt). All the points on the string between two consecutive nodes vibrate with
Answer:A, B, D
20
The displacement of a string is given by y (x,t) = 0.06 sin (2πx/3) cos (120πt)
where x and y are in m and t in s. The length of the string is 1.5m and its mass is 3.0 10-2 kg
Answer:B, C
Chapters
- Physical World
- Units and measurements
- Motion in a straight line
- Motion in a plane
- Laws of motion
- Work energy and power
- System of particles and rotational motion
- Gravitation
- Mechanical properties of solids
- Mechanical properties of fluids
- Thermal properties of matter
- thermodynamics
- Kinetic theory
- Oscillations
- Waves
