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

A metal conductor of length $$1 \mathrm{~m}$$ rotates vertically about one of its ends at an angular velocity of $$5 \mathrm{~rad} / \mathrm{s}$$. If horizontal component of earth's magnetic field is $$0.2 \times 10^{-4} \mathrm{~T}$$, then the e.m.f. developed between the two ends of the conductor is

A
$$5 ~\mu \mathrm{V}$$
B
$$50 \mathrm{~mV}$$
C
$$5 \mathrm{~mV}$$
D
$$50 ~\mu \mathrm{V}$$
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A black rectangular surface of area '$$\mathrm{A}$$' emits energy '$$\mathrm{E}$$' per second at $$27^{\circ} \mathrm{C}$$. If length and breadth is reduced to $$(1 / 3)^{\text {rd }}$$ of its initial value and temperature is raised to $$327^{\circ} \mathrm{C}$$ then energy emitted per second becomes

A
$$\frac{20 \mathrm{E}}{9}$$
B
$$\frac{8 \mathrm{E}}{9}$$
C
$$\frac{16 \mathrm{E}}{9}$$
D
$$\frac{4 \mathrm{E}}{9}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A disc of radius 0.4 metre and mass 1 kg rotates about an axis passing through its centre and perpendicular to its plane. The angular acceleration is 10 rad s$$^{-2}$$. The tangential force applied to the rim of the disc is

A
2N
B
3N
C
4N
D
5N
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The output of an 'OR' gate is 'one'

A
only when both inputs are 'one'.
B
only when both inputs are 'zero'.
C
only when either input is 'zero'.
D
if either or both inputs are 'one'.
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