Each of the two strings of lengths \(51.6~\text{cm}\) and \(49.1~\text{cm}\) is tensioned separately by \(20~\text{N}\) of force. The mass per unit length of both strings is the same and equals \(1~\text{g/m}.\) When both the strings vibrate simultaneously, the number of beats is:

1.	\(5\)	2.	\(7\)
3.	\(8\)	4.	\(3\)

Two sound waves with wavelengths \(5.0~\text{m}\) and \(5.5~\text{m}\), respectively, propagate in gas with a velocity of \(330~\text{m/s}\). How many beats per second can we expect?
1. \(12\)
2. \(0\)
3. \(1\)
4. \(6\)

A transverse wave propagating along the \(x\text-\)axis is represented by:
\(y(x,t)=8.0\sin\left(0.5\pi x-4\pi t-\frac{\pi}{4}\right)\), where \(x\) is in meters and \(t\) in seconds. The speed of the wave is: 
1. \(4\pi\) m/s
2. \(0.5\) m/s
3. \(\frac{\pi}{4}\) m/s
4. \(8\) m/s

The time of reverberation of a room \(A\) is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double those of room A?

1. 2

2. 4

3. $\frac{1}{2}$

4. 1

Which one of the following statements is true?

Statement–1 : In the case of a stationary wave,
a person hear a loud sound at the pressure nodes
as compared to the antinodes.
and
Statement–2 : In a stationary wave all the
particles of the medium vibrate in phase.
1. Statement-1 is True, Statement-2 is True,
Statement-2 is a correct explanation for
statement-1

2. Statement-1 is True, Statement-2 is True,
Statement-2 is NOT a correct explanation
for Statement-1

3. Statement-1 is True, Statement-2 is False

4. Statement-1 is False, Statement-2 is True

A : The propagation of sound in air should be an isothermal process.

R : As air is bad conductor of heat, its temperature does not change by compression or expansion.

The driver of a car travelling at a speed of 30 m/s towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by the driver is:

1. 550 Hz

2. 555.5 Hz

3. 720 Hz

4. 500 Hz