1
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A metal disc of radius $$R$$ rotates with an angular velocity $$\omega$$ about an axis perpendicular to its plane passing through its centre in a magnetic field of induction $$B$$ acting perpendicular to the plane of the disc. The magnitude of induced emf between the rim and axis of the disc is

A
$$\pi B R^2$$
B
$$\frac{2 \pi^2 B R^2}{\omega}$$
C
$$\pi B R^2 \omega$$
D
$$\frac{B R^2 \omega}{2}$$
2
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A mass $$M$$ is suspended from a light spring. An additional mass $$M_1$$ added extends the spring further by a distance $$x$$. Now, the combined mass will oscillate on the spring with period $$T=$$

A
$$2 \pi\left[\left(\frac{M_1 g}{x\left(M+M_1\right)}\right)\right]^{\frac{1}{2}}$$
B
$$2 \pi\left[\frac{\left(M+M_1\right) x}{M_1 g}\right]^{\frac{1}{2}}$$
C
$$\left(\frac{\pi}{2}\right)\left[\left(\frac{M_1 g}{x\left(M+M_1\right)}\right)\right]^{\frac{1}{2}}$$
D
$$2 \pi\left[\left(\frac{M+M_1}{M_1 g x}\right)\right]^{\frac{1}{2}}$$
3
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The path difference between two identical light waves at a point $$Q$$ on the screen is $$3 \mu \mathrm{m}$$. If wavelength of the waves is $$5000 \mathop A\limits^o$$, then at point $$Q$$ there is

A
3rd dark band
B
4th bright band
C
5th dark band
D
6 th bright band
4
MHT CET 2023 13th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the maximum efficiency of a full wave rectifier is $$x \%$$ and that of half-wave rectifier is $$y \%$$, then the relation between $$x$$ and $$y$$ is

A
$$x=y$$
B
$$x=2 y$$
C
$$y=2 x$$
D
$$y=4 x$$
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