13
MCQ (Multiple Correct Answer)
Speed of sound wave in a fluid depends upon
A
directly on density of the medium
B
square of Bulk modulus of the medium
C
inversly on the square root of density
D
directly on the square root of bulk modulus of the medium
14
MCQ (Multiple Correct Answer)
During propagation of a plane progressive mechanical wave,
A
all the particles are vibrating in the same phase
B
amplitude of all the particles is equal
C
particles of the medium executes SHM
D
wave velocity depends upon the nature of the medium
15
MCQ (Multiple Correct Answer)
The transverse displacement of a string (clamped at its both ends) is given by $y(x, t)=0.06 \sin \left(\frac{2 \pi x}{3}\right) \cos (120 \pi t)$. All the points on the string between two consecutive nodes vibrate with
A
same frequency
B
same phase
C
same energy
D
different amplitude
16
MCQ (Multiple Correct Answer)
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 $10 \mathrm{~m} / \mathrm{s}$. Given that the speed of sound in still air is $340 \mathrm{~m} / \mathrm{s}$. Then
A
the frequency of sound as heard by an observer standing on the platform is 400 Hz
B
the speed of sound for the observer standing on the platform is $350 \mathrm{~m} / \mathrm{s}$
C
the frequency of sound as heard by the observer standing on the platform will increase
D
the frequency of sound as heard by the observer standing on the platform will decrease
17
MCQ (Multiple Correct Answer)
Which of the following statement are true for a stationary waves?
A
Every particle has a fixed amplitude which is different from the amplitude of its nearest particle
B
All the particles cross their mean position at the same time
C
All the particles are oscillating with same amplitude
D
There is no net transfer of energy across any plane
E
There are some particles which are always at rest