Waves Test

Result

Waves Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (n’) of the sound heard by the observer is plotted against time (t). Which of the following best represents the resulting curve

A

B

C

D

Solution
Question 2
4 / -1

If the velocity of sound wave in humid air is v_m and that in dry air is v_d, then……

A
v_m > v_d

B
v_m < v_d

C
v_m = v_d

D
v_m >> v_d

Solution
Question 3
4 / -1

The ratio of frequencies of two waves travelling through the same medium is 2 : 5. The ratio of their wavelengths will be ………

A
2 : 5

B
5 : 2

C
3 : 5

D
5 : 3

Solution
Question 4
4 / -1

If the maximum frequency of a sound wave at room temperature is 20,000 hz then its minimum wavelength will be approximately ……… ( v = 340 ms^{– 1})

A
0.2 Å

B
5 Å

C
5 cm to 2 m

D
20 mm

Solution
Question 5
4 / -1

If the equation of a wave in a string having linear mass density 0.04 kg m^–1 is given by y = 0.02

A
6.25

B
4.0

C
12.5

D
0.5

Solution
Question 6
4 / -1

Consider two points lying at a distance of 10 m and 15 m from an oscillating source. If the periodic time of oscillation is 0.05 s and the velocity of wave produced is 300 m/s, then what will be the phase difference the two points?

A
π

B
π/6

C
π/3

D
2π/3

Solution
Question 7
4 / -1

A string is divided into three parts having lengths l₁, l₂ and l₃ each. If the fundamental frequency of these parts are f₁ , f₂ and f₃ respectively, then the fundamental frequency of the original string f = ……….

A

B

C

D

Solution
Question 8
4 / -1

Waves produced by two tuning forks are given by y₁ = 4 Sin 500πt and y₂ = 2 Sin 506πt. The number of beats produced per minute is …….

A
360

B
180

C
60

D
3

Solution
Question 9
4 / -1

Equation for a progressive harmonic wave is given by y = 8 Sin2π( 0.1x – 2t), where x and y are in cm and t is in seconds. What will be the phase difference between two particles of this wave separated by a distance of 2 cm?

A
18^o

B
36^o

C
72^o

D
54^o

Solution
Question 10
4 / -1

As shown in figure, two pulses in a string having centre to centre distance of 8 cm are travelling along mutually opposite direction. If the speed of both the pulse is 2 cm/s, then after 2 s, the energy of these pulses will be ………

A
zero

B
totally kinetic energy

C
totally potential energy

D
Partially potential energy and partially kinetic energy