31 Year NEET Previous Year Questions: Waves - 1

Question 1

Two waves are represented by the equations y₁ = a sin (ωt + kx + 0.57) m and y₂ = a cos (ωt + kx) m, where x is in meter and t in sec. The phase difference between them is [2011]

Accepted Answer

1.0 radian

Answer

1.25 radian

Answer

1.57 radian

Answer

0.57 radian

Question 2

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air [2011]

Accepted Answer

increases by a factor 10

Answer

decreases by a factor 10

Answer

increases by a factor 20

Answer

decreases by a factor 20

Question 3

Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be [2011M]

Accepted Answer

0.02

Answer

0.03

Answer

0.04

Answer

0.01

Question 4

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 frequency (v) of the string is [2012]

Accepted Answer

Answer

Answer

v = v₁ + v₂ + v₃

Answer

Question 5

Two sources of sound placed close to each other are emitting progressive waves given by y₁ = 4 sin 600πt and y₂ = 5 sin 608πt. An observer located near these two sources of sound will hear :[2012]

Accepted Answer

4 beats per second with in tensity ratio 81 : 1 between waxing and waning

Answer

4 beats per second with in tensity ratio 25 : 16 between waxing and waning.

Answer

8 beats per second with in tensity ratio 25 : 16 between waxing and waning

Answer

8 beats per second with in tensity ratio 81 : 1 between waxing and waning

Question 6

A train moving at a speed of 220 ms^–1 towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is : [2012M] (speed of sound in air is 330 ms^–1)

Accepted Answer

5000 Hz

Answer

3500 Hz

Answer

4000 Hz

Answer

3000 Hz

Question 7

If we study the vibration of a pipe open at both ends, then which of the following statements is not true ? [NEET 2013]

Accepted Answer

Pressure change will be maximum at both ends

Answer

Odd harmonics of the fundamental frequency will be generated

Answer

All harmonics of the fundamental frequency will be generated

Answer

Antinode will be at open endPressure change will be minimum at both ends. In fact, pressure variation is maximum at /2 because the displacement node is pressure antinode.

Question 8

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is [NEET 2013]

Accepted Answer

254 Hz

Answer

246 Hz

Answer

240 Hz

Answer

260 Hz

Question 9

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelen gth 2πm and frequency Hz isrepresented by [NEET 2013]

Accepted Answer

y = sin (x – 2t)

Answer

y = sin (2πx – 2πt)

Answer

y = sin (10πx – 20πt)

Answer

y = sin (2πx + 2πt)

Question 10

The length of the wire between 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 of 1 : 3 : 5? [NEET Kar. 2013]

Accepted Answer

Answer

Answer

Answer

Question 11

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms^–1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be [NEET Kar. 2013]

Accepted Answer

4

Answer

zero

Answer

8

Answer

2

31 Year NEET Previous Questions: Waves - 1 Free MCQ Practice Test [Updated]

MCQ Practice Test & Solutions: 31 Year NEET Previous Year Questions: Waves - 1 (11 Questions)

Two waves are represented by the equations y₁ = a sin (ωt + kx + 0.57) m and y₂ = a cos (ωt + kx) m, where x is in meter and t in sec. The phase difference between them is [2011]

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air [2011]

Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be [2011M]

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 frequency (v) of the string is [2012]

Two sources of sound placed close to each other are emitting progressive waves given by y₁ = 4 sin 600πt and y₂ = 5 sin 608πt. An observer located near these two sources of sound will hear :[2012]

If we study the vibration of a pipe open at both ends, then which of the following statements is not true ? [NEET 2013]

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is [NEET 2013]

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelen gth 2πm and frequency Hz isrepresented by [NEET 2013]

The length of the wire between 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 of 1 : 3 : 5? [NEET Kar. 2013]

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms^–1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be [NEET Kar. 2013]

Physics Class 11

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31 Year NEET Previous Questions: Waves - 1 Free MCQ Practice Test [Updated]

MCQ Practice Test & Solutions: 31 Year NEET Previous Year Questions: Waves - 1 (11 Questions)

Two waves are represented by the equations y1 = a sin (ωt + kx + 0.57) m and y2 = a cos (ωt + kx) m, where x is in meter and t in sec. The phase difference between them is [2011]

Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air [2011]

Two identical piano wires kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be [2011M]

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 frequency (v) of the string is [2012]

Two sources of sound placed close to each other are emitting progressive waves given by y1 = 4 sin 600πt and y2 = 5 sin 608πt. An observer located near these two sources of sound will hear :[2012]

If we study the vibration of a pipe open at both ends, then which of the following statements is not true ? [NEET 2013]

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is [NEET 2013]

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelen gth 2πm and frequency Hz isrepresented by [NEET 2013]

The length of the wire between 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 of 1 : 3 : 5? [NEET Kar. 2013]

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms–1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be [NEET Kar. 2013]

Physics Class 11

Physics Class 11

Top Courses for NEET

About this NEET Practice Test

Explore more NEET Study Resources

Two waves are represented by the equations y₁ = a sin (ωt + kx + 0.57) m and y₂ = a cos (ωt + kx) m, where x is in meter and t in sec. The phase difference between them is [2011]

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 frequency (v) of the string is [2012]

Two sources of sound placed close to each other are emitting progressive waves given by y₁ = 4 sin 600πt and y₂ = 5 sin 608πt. An observer located near these two sources of sound will hear :[2012]

Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms^–1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be [NEET Kar. 2013]