1
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Sound waves of frequency $$600 \mathrm{~Hz}$$ fall normally on a perfectly reflecting wall. The shortest distance from the wall at which all particles will have maximum amplitude of vibration is (speed of sound $$=300 \mathrm{~ms}^{-1}$$ )

A
$$\frac{1}{4} \mathrm{~m}$$
B
$$\frac{1}{8} \mathrm{~m}$$
C
$$\frac{3}{8} \mathrm{~m}$$
D
$$\frac{7}{8} \mathrm{~m}$$
2
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A wire $$P Q$$ has length $$4.8 \mathrm{~m}$$ and mass $$0.06 \mathrm{~kg}$$. Another wire QR has length $$2.56 \mathrm{~m}$$ and mass $$0.2 \mathrm{~kg}$$. Both wires have same radii and are joined as a single wire. This wire is under tension of $$80 \mathrm{~N}$$. A wave pulse of amplitude $$3.5 \mathrm{~cm}$$ is sent along the wire $$\mathrm{PQ}$$ from end $$\mathrm{P}$$.

A
0.1 s
B
0.12 s
C
0.14 s
D
0.16 s
3
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sonometer wire $$49 \mathrm{~cm}$$ long is in unison with a tuning fork of frequency '$$n$$'. If the length of the wire is decreased by $$1 \mathrm{~cm}$$ and it is vibrated with the same tuning fork, 6 beats are heard per second. The value of '$$n$$' is

A
256 Hz
B
288 Hz
C
320 Hz
D
384 Hz
4
MHT CET 2023 14th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A source of sound is moving towards a stationary observer with $$\left(\frac{1}{10}\right)^{\text {th }}$$ the of the speed of sound. The ratio of apparent to real frequency is

A
$$10: 9$$
B
$$11: 10$$
C
$$(11)^2:(10)^2$$
D
$$(9)^2:(10)^2$$
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