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 Evening Shift
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment, the intensity at a point where the path difference is $$\frac{\lambda}{4}$$ [ $$\lambda$$ is wavelength of light used] is '$$\mathrm{I}$$'. If '$$\mathrm{I}_0$$' is the maximum intensity then $$\frac{\mathrm{I}}{\mathrm{I}_0}$$ is equal to $$\left[\cos \frac{\pi}{4}=\sin \frac{\pi}{4}=\frac{1}{\sqrt{2}}\right]$$

A
3 : 2
B
2 : 3
C
3 : 4
D
1 : 2
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the centre of a current carrying circular coil of area 'A' is 'B'. The magnetic moment of the coil is ( $$\mu_0=$$ permeability of free space)

A
$$\frac{2 \mathrm{BA}^{3 / 2}}{\mu_0 \sqrt{\pi}}$$
B
$$\frac{\mathrm{BA}^{3 / 2}}{\mu_0 \pi}$$
C
$$\frac{\mu_0 \sqrt{\pi}}{2 \mathrm{BA}^2}$$
D
$$\frac{2 \mathrm{BA}^2}{\mu_0 \sqrt{\pi}}$$
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A galvanometer has resistance '$$\mathrm{G}$$' $$\Omega$$ and '$$\mathrm{I}_{\mathrm{g}}$$' is current flowing through it which produces full scale deflection. '$$\mathrm{S}_1$$' is the value of shunt which converts it into an ammeter of range 0 to '$$3 \mathrm{I}$$' and '$$\mathrm{S}_2$$' is the shunt value which converts it into an ammeter of range 0 to '$$4 \mathrm{I}$$', the ratio $$\mathrm{S}_2: \mathrm{S}_1$$ is

A
$$\frac{4}{3}$$
B
$$\frac{3 \mathrm{I}-\mathrm{I}_{\mathrm{g}}}{4 \mathrm{I}-\mathrm{I}_{\mathrm{g}}}$$
C
$$\frac{3}{4}$$
D
$$\frac{4 I-I_g}{3 I-I_g}$$
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