1
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The fundamental frequency of an air column in pipe 'A' closed at one end coincides with second overtone of pipe 'B' open at both ends. The ratio of length of pipe 'A' to that of pipe 'B' is

A
3 : 8
B
3 : 4
C
1 : 6
D
2 : 3
2
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A tuning fork of frequency '$$n$$' is held near the open end of tube which is closed at the other end and the lengths are adjusted until resonance occurs. The first resonance occurs at length $$L_1$$ and immediate next resonance occurs at length $$L_2$$. The speed of sound in air is

A
$$n\left(L_2-L_1\right)$$
B
$$\frac{\mathrm{n}\left(\mathrm{L}_2-\mathrm{L}_1\right)}{2}$$
C
$$2 n\left(L_2-L_1\right)$$
D
$$\frac{\mathrm{n}\left(\mathrm{L}_2+\mathrm{L}_1\right)}{2}$$
3
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sound wave of frequency $$160 \mathrm{~Hz}$$ has a velocity of $$320 \mathrm{~m} / \mathrm{s}$$. When it travels through air, the particles having a phase difference of $$90^{\circ}$$, are separated by a distance of

A
50 cm
B
1 cm
C
25 cm
D
75 cm
4
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A glass tube of $$1 \mathrm{~m}$$ length is filled with water. The water can be drained out slowly from the bottom of the tube. If vibrating tuning fork of frequency $$500 \mathrm{~Hz}$$ is brought at the upper end of the tube then total number of resonances obtained are [Velocity of sound in air is $$320 \mathrm{~ms}^{-1}$$]

A
3
B
4
C
1
D
2
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