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

What is the additional energy that should be supplied to a moving electron to reduce its de Broglie wavelength from $$1 \mathrm{~nm}$$ to $$0.5 \mathrm{~nm}$$ ?

A
Four times its initial energy.
B
Five times its initial energy.
C
Two times its initial energy.
D
Three times its initial energy.
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A convex lens of focal length $$\mathrm{T}$$ is used to form an image whose size is one fourth that of size of the object. Then the object distance is

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

A particle at rest starts moving with a constant angular acceleration of $$4 \mathrm{~rad} / \mathrm{s}^2$$ in a circular path. At what time the magnitude of its centripetal acceleration and tangential acceleration will be equal?

A
$$\frac{1}{4} \mathrm{~S}$$
B
$$\frac{2}{3} \mathrm{~S}$$
C
$$\frac{1}{2} \mathrm{~S}$$
D
$$\frac{1}{3} \mathrm{~S}$$
4
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
$$50 ~\mu \mathrm{V}$$
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