1
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

An alternating e.m.f. is $$\mathrm{e}=\mathrm{e}_0 \sin \omega \mathrm{t}$$. In what time the e.m.f. will have half its maximum value, if '$$\mathrm{e}$$' starts from zero? ($$\mathrm{T}=$$ time period, $$\sin 30^{\circ}=0.5$$)

A
$$\frac{\mathrm{T}}{12}$$
B
$$\mathrm{\frac{T}{16}}$$
C
$$\frac{\mathrm{T}}{4}$$
D
$$\mathrm{\frac{T}{8}}$$
2
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A ray of light is incident on one face of an equilateral glass prism having refractive index $$\sqrt{2}$$. It produces the emergent ray which just. grazes along the adjacent face. The value of angle of incidence is $$\left(\sin 45^{\circ}=\cos 45^{\circ}=\frac{1}{\sqrt{2}}\right)$$

A
$$\sin ^{-1}\left(\frac{1}{\sqrt{2}} \sin 15^{\circ}\right)$$
B
$$\sin ^{-1}\left(\sqrt{2} \sin 30^{\circ}\right)$$
C
$$\sin ^{-1}\left(\frac{1}{\sqrt{2}} \sin 45^{\circ}\right)$$
D
$$\sin ^{-1}\left(\sqrt{2} \sin 15^{\circ}\right)$$
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The input a.c. voltage of frequency $$60 \mathrm{~Hz}$$ is applied to half-wave rectifier and also to full-wave rectifier. The output frequency in case of half-wave rectifier and that in case of full wave rectifier is respectively.

A
120 Hz, 60 Hz
B
60 Hz, 120 Hz
C
60 Hz, 60 Hz
D
120 Hz, 120 Hz
4
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Three point masses, each of mass 'm' are kept at the corners of an equilateral triangle of side 'L'. The system rotates about the centre of the triangle without any change in the separation of masses during rotation. The period of rotation is directly proportional to $$\left(\cos 30^{\circ}=\frac{\sqrt{3}}{2}\right)$$

A
L
B
$$\mathrm{L}^{1 / 2}$$
C
$$\mathrm{L}^{3 / 2}$$
D
$$\mathrm{L}^{-2}$$
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