$$4.0~\text{gm}$$ of gas occupies $$22.4~\text{litres}$$ at NTP. The specific heat capacity of the gas at a constant volume is  $$5.0~\text{JK}^{-1}\text{mol}^{-1}.$$ If the speed of sound in the gas at NTP is $$952~\text{ms}^{-1},$$ then the molar heat capacity at constant pressure will be:
($$R=8.31~\text{JK}^{-1}\text{mol}^{-1}$$

 1 $$8.0~\text{JK}^{-1}\text{mol}^{-1}$$ 2 $$7.5~\text{JK}^{-1}\text{mol}^{-1}$$ 3 $$7.0~\text{JK}^{-1}\text{mol}^{-1}$$ 4 $$8.5~\text{JK}^{-1}\text{mol}^{-1}$$
Subtopic:  Speed of Sound |
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A string is stretched between fixed points separated by $$75.0~\text{cm}$$. It is observed to have resonant frequencies of $$420~\text{Hz}$$ and $$315~\text{Hz}$$. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is:
1. $$155 \mathrm{~Hz}$$
2. $$205 \mathrm{~Hz}$$
3. $$10.5 \mathrm{~Hz}$$
4. $$105 \mathrm{~Hz}$$

Subtopic:  Standing Waves |
78%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The fundamental frequency of a closed organ pipe of a length $$20$$ cm is equal to the second overtone of an organ pipe open at both ends. The length of the organ pipe open at both ends will be:

 1 $$80$$ cm 2 $$100$$ cm 3 $$120$$ cm 4 $$140$$ cm
Subtopic:  Standing Waves |
77%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If $$n_1$$, $$n_2$$, and $$n_3$$ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency $$n$$ of the string is given by:
1. $$\frac{1}{n}=\frac{1}{n_1}+\frac{1}{n_2}+\frac{1}{n_3}$$
2. $$\frac{1}{\sqrt{n}}=\frac{1}{\sqrt{n_1}}+\frac{1}{\sqrt{n_2}}+\frac{1}{\sqrt{n_3}}$$
3. $$\sqrt{n}=\sqrt{n_1}+\sqrt{n_2}+\sqrt{n_3}$$
4. $$n=n_1+n_2+n_3$$

Subtopic:  Standing Waves |
77%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The number of possible natural oscillations of the air column in a pipe closed at one end of length $$85$$ cm whose frequencies lie below $$1250$$ Hz are:(velocity of sound= $$340~\text{m/s}$$
1. $$4$$
2. $$5$$
3. $$7$$
4. $$6$$

Subtopic:  Standing Waves |
68%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If we study the vibration of a pipe open at both ends, then which of the following statements is not true:

 1 Odd harmonics of the fundamental frequency will be generated. 2 All harmonics of the fundamental frequency will be generated. 3 Pressure change will be maximum at both ends. 4 The open end will be an antinode.
Subtopic:  Standing Waves |
57%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A source of unknown frequency gives $$4$$ beats/s when sounded with a source of known frequency of $$250~\text{Hz}$$. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency of $$513~\text{Hz}$$. The unknown frequency will be:

 1 $$246~\text{Hz}$$ 2 $$240~\text{Hz}$$ 3 $$260~\text{Hz}$$ 4 $$254~\text{Hz}$$
Subtopic:  Beats |
77%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A wave traveling in the +ve $$x$$-direction having maximum displacement along $$y$$-direction as $$1~\text{m}$$, wavelength $$2\pi ~\text{m}$$ and frequency of $$\frac{1}{\pi}~\text{Hz}$$, is represented by:
1. $$y=\sin (2 \pi x-2 \pi t)$$
2. $$y=\sin (10 \pi x-20 \pi t)$$
3. $$y=\sin (2 \pi x+2 \pi t)$$
4. $$y=\sin (x-2 t)$$

Subtopic:  Wave Motion |
86%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The length of a wire between the two ends of a sonometer is $$100$$ cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio $$1:3:5$$?
1. $$\frac{1500}{23} \mathrm{~cm}, \frac{500}{23} \mathrm{~cm}$$
2. $$\frac{1500}{23} \mathrm{~cm}, \frac{300}{23} \mathrm{~cm}$$
3. $$\frac{300}{23} \mathrm{~cm}, \frac{1500}{23} \mathrm{~cm}$$
4. $$\frac{1500}{23} \mathrm{~cm}, \frac{2000}{23} \mathrm{~cm}$$
Subtopic:  Standing Waves |
From NCERT
NEET - 2013
Please attempt this question first.
Hints
Please attempt this question first.

Two sources $$\text{P}$$ and $$\text{Q}$$ produce notes of frequency $$660~\text{Hz}$$ each. A listener moves from $$\text{P}$$ to $$\text{Q}$$ with a speed of $$1$$ m/s. If The speed of sound is $$330$$ m/s, then number of beats heard by the listener per second will be:
1. $$4$$
2. $$8$$
3. $$2$$
4. zero
Subtopic:  Doppler's Effect (OLD NCERT) |
From NCERT
NEET - 2013
Please attempt this question first.
Hints
Please attempt this question first.