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CBSE

Subject

Physics

NEET Physics : Waves

Multiple Choice Questions

111.

Standing waves are formed on a string when interference occurs between two waves having

the same amplitude travelling in the same direction with no phase difference between them
the same amplitude, travelling in the opposite direction with no phase difference between them
different amplitudes travelling in the same direction
different amplitudes travelling in the opposite direction

112.

Sound waves produced in gas are

longitudinal
transversal
stationary
progressive

113.

Intensity of a source of a 100 cd at a distance 2 m is

25 lux
50 lux
75 lux
150 lux

114.

A tuning fork produce 2 beats when sounded with one oscillator of frequency 514 Hz, and produces 6 beats with the other oscillator of frequency 510 Hz. The frequency of tuning fork is

516 Hz
510 Hz
514 Hz
520 Hz

115.

To hear the echo in 1 s, the minimum distance of the source from the reflecting surface should be

28 m
18 m
19 m
165 m

116.

Relation of wavelengths of sound and light is

λ_S < λ_L
λ_S > λ_L
λ_S = λ_L
None of these

117.

Wavelength of the wave in the above question is

1.7 m
8.5 m
0.85 m
0.17 m

118.

Equation of a progressive sound wave is y = a sin $(400 πt - \frac{πx}{0.85})$ where x in (metre), t (second), then frequency of wave is

200 Hz
400 Hz
500 Hz
600 Hz

119.

For the stationary wave

$y = u \sin (\frac{πx}{15}) \cos 96 πt$

The distance between a node and the next antinode is

7.5 cm
15 cm
22.5 cm
30 cm

120.

The length of two open organ pipes are l and (l+ Δl) respectively. Neglecting end corrections the beats frequency between them will be approximately

$\frac{v}{2 l}$
$\frac{v}{4 l}$
$\frac{v ∆ l}{2 l^{2}}$
$\frac{v ∆ l}{l}$

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