1
MHT CET 2022 11th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A hollow pipe of length $$0.8 \mathrm{~m}$$ is closed at one end. At its open end, a $$0.5 \mathrm{~m}$$ long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of pipe. If the tension in the string is $$50 \mathrm{~N}$$ and speed of sound in air is $$320 \mathrm{~m} / \mathrm{s}$$, the mass of the string is

A
20 g
B
10 g
C
40 g
D
5 g
2
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A cylindrical tube open at both ends has fundamental frequency 'n' in air. The tube is dipped vertically in water so that one-fourth of it is in water. The fundamental frequency of the air column becomes

A
$$\frac{3 n}{4}$$
B
$$\frac{n}{2}$$
C
$$n$$
D
$$\frac{2 n}{3}$$
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Velocity of sound waves in air is '$$\mathrm{V}$$' $$\mathrm{m} / \mathrm{s}$$. For a particular sound wave in air, path difference of 'x' $$\mathrm{cm}$$ is equivalent to phase difference $$n \pi$$. The frequency of this wave is

A
$$\frac{V n}{x}$$
B
$$\frac{V}{n x}$$
C
$$\frac{V n}{2 x}$$
D
$$\frac{2 x}{V}$$
4
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The length and diameter of a metal wire used in sonometer is doubled. The fundamental frequency will change from 'n' to

A
$$\frac{n}{4}$$
B
2n
C
2n
D
$$\frac{n}{2}$$
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