The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal).

at the same temperature will be (assume both gases to be ideal).a) 460m/sb) 500m/sc) 650m/sd) 1420m/s

A wave y=asin(‚âà√¨‚àö¬¢t-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is$

y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)

y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t+kx)

y=-asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t+kx)

y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)

y=-asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)

19 + Mcqs in Longitudinal Waves in Engineering Physics Page 1 McqOptions

1.	It takes 2 seconds for a second wave to travel between two fixed points when the day temperature is 10°C. If the temperature rises to 30°C, the sound wave travels between the same fixed parts in __________
A.	1.9 sec
B.	2 sec
C.	2.1 sec
D.	2.2 sec
Answer» B. 2 sec

Discussion

2.	A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of ____________
A.	100
B.	1000
C.	10000
D.	10
Answer» B. 1000

Discussion

3.	A metal wire of linear mass density of 9.8/gm is stretched with a tension of 10kg wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance, when carrying an alternating current of frequency v. The frequency v of the alternating source is?
A.	50 Hz
B.	100 Hz
C.	200 Hz
D.	25 Hz
Answer» B. 100 Hz

Discussion

4.	Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is?
A.	20
B.	80
C.	40
D.	120
Answer» C. 40

Discussion

5.	The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal).
A.	460m/s
B.	500m/s
C.	650m/s
D.	1420m/s
E.	at the same temperature will be (assume both gases to be ideal).a) 460m/sb) 500m/sc) 650m/sd) 1420m/s
Answer» E. at the same temperature will be (assume both gases to be ideal).a) 460m/sb) 500m/sc) 650m/sd) 1420m/s

Discussion

6.	A wave y=asin(ωt-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is?
A.	y=asin⁡(ωt+kx)
B.	y=-asin⁡(ωt+kx)
C.	y=asin⁡(ωt-kx)
D.	y=-asin⁡(ωt-kx)
Answer» C. y=asin⁡(ωt-kx)

Discussion

7.	The displacement y of a wave travelling in the x direction is given byy=10-4 sin⁡(600t-2x+π/3)Where x is expressed in meters and t is seconds. The speed of the wave motion (in m/s) is?
A.	300
B.	600
C.	1200
D.	200
Answer» B. 600

Discussion

8.	The displacement y of a particle in a medium can be expressed asy=10-6 sin⁡(100t+20x+π/4)Where t is in seconds and x in meter. The speed of the wave is?
A.	2000m/s
B.	5m/s
C.	20m/s
D.	5πm/s
Answer» C. 20m/s

Discussion

9.	The displacement of a particle varies according to the relationx=4(cosπt+sinπt)The amplitude of the particle is?
A.	-4
B.	4
C.	4√2
D.	8
Answer» D. 8

Discussion

10.	THE_RATIO_OF_VELOCITY_OF_SOUND_IN_HYDROGEN_AND_OXYGEN_AT_STP_IS?$
A.	16:1
B.	8:1
C.	4:1
D.	2:1
Answer» D. 2:1

Discussion

11.	It_takes_2_seconds_for_a_second_wave_to_travel_between_two_fixed_points_when_the_day_temperature_is_10¬¨¬®‚Äö√†√ªC._If_the_temperature_rises_to_30¬¨¬®‚Äö√†√ªC,_the_sound_wave_travels_between_the_same_fixed_parts_in$#
A.	1.9 sec
B.	2 sec
C.	2.1 sec
D.	2.2 sec
Answer» B. 2 sec

Discussion

12.	A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor o?
A.	100
B.	1000
C.	10000
D.	10
Answer» B. 1000

Discussion

13.	A metal wire of linear mass density of 9.8/gm is stretched with a tension of 10kg wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance, when carrying an alternating current of frequency v. The frequency v of the alternating source is
A.	50 Hz
B.	100 Hz
C.	200 Hz
D.	25 Hz
Answer» B. 100 Hz

Discussion

14.	Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is
A.	20
B.	80
C.	40
D.	120
Answer» C. 40

Discussion

15.	The speed of sound in oxygen (O₂) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)
A.	460m/s
B.	500m/s
C.	650m/s
D.	1420m/s
Answer» E.

Discussion

16.	A wave y=asin(‚âà√¨‚àö¬¢t-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is$
A.	y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t+kx)
B.	y=-asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t+kx)
C.	y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)
D.	y=-asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)
Answer» C. y=asin‚Äö√Ñ√∂‚àö√ñ¬¨‚àû(‚âà√¨‚àö¬¢t-kx)

Discussion

17.	The displacement y of a wave travelling in the x direction is given by
A.
B.	is
C.	300
D.	600
Answer» B. is

Discussion

18.	The displacement y of a particle in a medium can be expressed as
A.
B.
C.	2000m/s
Answer» C. 2000m/s

Discussion

19.	The displacement of a particle varies according to the relation
A.
B.
C.	-4
Answer» D.

Discussion

Explore topic-wise MCQs in Engineering Physics.

It takes 2 seconds for a second wave to travel between two fixed points when the day temperature is 10°C. If the temperature rises to 30°C, the sound wave travels between the same fixed parts in __________

A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of ____________

Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is?

The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal).

A wave y=asin(ωt-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is?

The displacement y of a wave travelling in the x direction is given byy=10-4 sin⁡(600t-2x+π/3)Where x is expressed in meters and t is seconds. The speed of the wave motion (in m/s) is?

The displacement y of a particle in a medium can be expressed asy=10-6 sin⁡(100t+20x+π/4)Where t is in seconds and x in meter. The speed of the wave is?

The displacement of a particle varies according to the relationx=4(cosπt+sinπt)The amplitude of the particle is?

THE_RATIO_OF_VELOCITY_OF_SOUND_IN_HYDROGEN_AND_OXYGEN_AT_STP_IS?$

It_takes_2_seconds_for_a_second_wave_to_travel_between_two_fixed_points_when_the_day_temperature_is_10¬¨¬®‚Äö√†√ªC._If_the_temperature_rises_to_30¬¨¬®‚Äö√†√ªC,_the_sound_wave_travels_between_the_same_fixed_parts_in$#

A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor o?

Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is

The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)

A wave y=asin(‚âà√¨‚àö¬¢t-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is$

The displacement y of a wave travelling in the x direction is given by

The displacement y of a particle in a medium can be expressed as

The displacement of a particle varies according to the relation

The speed of sound in oxygen (O₂) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)