Home · BITSAT · Physics · Waves and Sound

Waves and Sound — BITSAT Physics PYQs

30 previous year questions from Waves and Sound with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

Waves and Sound — BITSAT Physics PYQs

The speed of sound in oxygen at S.T.P. will be approximately: (Given, . R =8.3 JK ⁻¹, =1.4 )

A plane progressive wave is given by y=2 2 (330 t-x) m . The frequency of the wave is:

The engine of a train moving with speed 10 ~ms ⁻¹ towards a platform sounds a whistle at frequency 400 ~Hz . The frequency heard by a passenger inside the train is (neglect air spe

The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:

A submarine A travelling at 17 ~m / s is being chased along the line of its velocity by another submarine B travelling at 34 ~m / s . B sends a sonar signal of 600 ~Hz to detect A

Transverse waves of the same frequency are generated in two steel wires A and B . The diameter of A is twice that of B and the tension in A is half that in B . The ratio of the vel

A direct current of 6 ~A is superimposed on an alternating current I=10 t flowing through a wire. The effective value of the resulting current will be

The frequency of whistle of an engine appears to be (4 / 5)^ th of initial frequency when it crosses a stationary observer. If the velocity of sound is 330 ~m / s , then the speed

The displacement y of a particle in a medium can be expressed as, y=10⁻⁶ (100 t+20 x+ 4 ) m where t is in second and x in meter. The speed of the wave is

An organ pipe, open from both end produces 5 beats per second when vibrated with a source of frequency 200 ~Hz . The second harmonic of the same pipes produces 10 beats per second

A whistle of frequency 1000 ~Hz is sounded on a car travelling towards a cliff with velocity of 18 ~m ~s ⁻¹ normal to the cliff. If c =330 ~m ~s ⁻¹ , then the apparent frequency of

Two sources of sound A and B are moving towards and away from a stationary observer with the same speed respectively. If the frequency of the sound produced by both the sources is

If sound travels in air with the speed of 340 m s - 1 , then the number of tones present in an open organ pipe of length 2 m for a maximum frequency of 1200 Hz , are

A train moves towards a stationary observer with speed 34 m s - 1 . The train blows whistle and its frequency is registered by the observer as &#957; 1 . If the train&#39;s speed i

A whistle of frequency 500 Hz tied to the end of a string of length 1 . 2 m revolves at 400 rev min - 1 . A listener standing some distance away in the plane of rotation of whistle

A transverse wave propagating on a stretched string of linear density 3 &#215; 10 - 4 kgm - 1 is represented by the equation y = 0 . 2 sin ( 1 . 5 x + 60 t ) where, x in metres and

A string of length is fixed at both ends. It is vibrating in its 3^ rd overtone with maximum amplitude'a'. The amplitude at a distance / 3 from one end is

A source of sound S emitting waves of frequency 100 ~Hz and an observor O are located at some distance from each other. The source is moving with a speed of 19.4 ~ms ⁻¹ at an angle

Two tuning forks with natural frequencies 340 Hz each move relative to a stationary observer. One fork moves away from the observer, while the other moves towards the observer at t

The frequency of a sonometer wire is 100 ~Hz . When the weights producing the tensions are completely immersed in water, the frequency becomes 80 ~Hz and on immersing the weights i

A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted aga

When a string is divided into three segments of length l₁, l₂, and l₃ , the fundamental frequencies of these three segments are v₁, v₂ and v₃ respectively. The original fundamental

Two waves of wavelengths 99 ~cm and 100 ~cm both travelling with velocity 396 ~m / s are made to interfere. The number of beats produced by them per second is

If equation of transverse wave is y=x₀ 2 ( nt - x ) . Maximum velocity of particle is twice of wave velocity, if is-

The transverse displacement y(x, t) of a wave on a string is given by y(x, t)=e^ - (a x²+b t²+2 a b . xt ) This represents a

A sound souorce is moving towards stationary listener with 1 10 th of the speed of sound. The ratio of apparent to read frequency is

The fundamental frequency of an open organ pipe is 300 ~Hz . The first overtone of this pipe has same frequency as first overtone of a closed organ pipe. If speed of sound is 330 ~

A wave y=a ( t-k x) on a string meets with another wave producing a node at x =0 . Then the equation of the unknown wave is

A source of sound produces waves of wavelength 60 ~cm when it is stationary. If the speed of sound in air is 320 ~m ~s ⁻¹ and source moves with speed 20 ~m ~s ⁻¹, the wavelength of

Two tuning forks A and B sounded together give 6 beats per second. With an air resonance tube closed at one end, the two forks give resonance when the two air columns are 24 ~cm an

A train moves towards a stationary observer with speed 34 m s - 1 . The train blows whistle and its frequency is registered by the observer as ν 1 . If the train's speed i

A transverse wave propagating on a stretched string of linear density 3 × 10 - 4 kgm - 1 is represented by the equation y = 0 . 2 sin ( 1 . 5 x + 60 t ) where, x in metres and