1
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Beats are produced by waves $$\mathrm{y_1=a\sin2000\pi t}$$ and $$\mathrm{y_2=a\sin2008\pi t}$$. The number of beats heard per second is

A
4
B
1
C
zero
D
8
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The frequencies of three tuning forks $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are related as $$\mathrm{n}_{\mathrm{A}}>\mathrm{n}_{\mathrm{B}}>\mathrm{n}_{\mathrm{C}}$$. When the forks $$\mathrm{A}$$ and $$\mathrm{B}$$ are sounded together, the number of beats produced per second is '$$n_1$$'. When forks $$\mathrm{A}$$ and $$\mathrm{C}$$ are sounded together the number of beats produced per second is '$$n_2$$'. How may beats are produced per second when forks $$\mathrm{B}$$ and $$\mathrm{C}$$ are sounded together?

A
$$\mathrm{n}_1-\mathrm{n}_2$$
B
$$\frac{\mathrm{n}_1+\mathrm{n}_2}{2}$$
C
$$\mathrm{n}_2-\mathrm{n}_1$$
D
$$n_1+n_2$$
3
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The equation of wave is given by $$\mathrm{y}=10 \sin \left(\frac{2 \pi \mathrm{t}}{30}+\alpha\right)$$. If the displacement is $$5 \mathrm{~cm}$$ at $$\mathrm{t}=0$$, then the total phase at $$\mathrm{t}=7.5 \mathrm{~s}$$ will be

$$\left[\sin 30^{\circ}=\cos 60^{\circ}=\frac{1}{2}, \cos 30^{\circ}=\sin 60^{\circ}=\frac{\sqrt{3}}{2}\right] $$

A
$$\frac{\pi}{3} \mathrm{rad}$$
B
$$\frac{\pi}{2} \mathrm{rad}$$
C
$$\frac{2 \pi}{5} \mathrm{rad}$$
D
$$\frac{2 \pi}{3} \mathrm{rad}$$
4
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A sonometer wire resonates with 4 antinodes between two bridges for a given tuning fork, when 1 kg mass is suspended from the wire. Using same fork, when mass M is suspended, the wire resonates producing 2 antinodes between the two bridges (distance between two bridges is as before). The value of M is

A
2.5 kg
B
3.5 kg
C
4 kg
D
1 kg
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