1
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sound of frequency $$480 \mathrm{~Hz}$$ is emitted from the stringed instrument. The velocity of sound in air is $$320 \mathrm{~m} / \mathrm{s}$$. After completing 180 vibrations, the distance covered by a wave is

A
60 m
B
90 m
C
120 m
D
180 m
2
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sonometer wire '$$A$$' of diameter '$$\mathrm{d}$$' under tension '$$T$$' having density '$$\rho_1$$' vibrates with fundamental frequency '$$n$$'. If we use another wire '$$B$$' which vibrates with same frequency under tension '$$2 \mathrm{~T}$$' and diameter '$$2 \mathrm{D}$$' then density '$$\rho_2$$' of wire '$$B$$' will be

A
$$\rho_2=2 \rho_1$$
B
$$\rho_2=\rho_1$$
C
$$\rho_2=\frac{\rho_1}{2}$$
D
$$\rho_2=\frac{\rho_1}{4}$$
3
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The upper end of the spring is fixed and a mass '$$m$$' is attached to its lower end. When mass is slightly pulled down and released, it oscillates with time period 3 second. If mass '$$\mathrm{m}$$' is increased by $$1 \mathrm{~kg}$$, the time period becomes 5 second. The value of '$$\mathrm{m}$$' is (mass of spring is negligible)

A
$$\frac{3}{8} \mathrm{~kg}$$
B
$$\frac{5}{9} \mathrm{~kg}$$
C
$$\frac{8}{13} \mathrm{~kg}$$
D
$$\frac{9}{16} \mathrm{~kg}$$
4
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

What should be the diameter of a soap bubble, in order that the excess pressure inside it is $$25.6 \mathrm{~Nm}^{-2}$$ ? [surface tension of soap solution $$\left.=3 \cdot 2 \times 10^{-2} \mathrm{~Nm}^{-2}\right]$$

A
2 cm
B
1.5 cm
C
1 cm
D
0.5 cm
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