1
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A body is projected vertically upwards from earth's surface of radius '$$R$$' with velocity equal to $$\frac{1^{\text {rd }}}{3}$$ of escape velocity. The maximum height reached by the body is

A
$$\frac{R}{8}$$
B
$$\frac{\mathrm{R}}{6}$$
C
$$\frac{\mathrm{R}}{4}$$
D
$$\frac{\mathrm{R}}{9}$$
2
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following statements is WRONG regarding LED?

A
LEDs are energy efficient
B
LEDs have long time if properly manufactured.
C
Brightness of light emitted by LED cannot be controlled.
D
Colours produced by LED do not fade out.
3
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A thin wire of length '$$L$$' and uniform linear mass density '$$m$$' is bent into a circular coil. The moment of inertia of this coil about tangential axis and in plane of the coil is

A
$$\frac{3 \mathrm{~mL}^2}{5 \pi^2}$$
B
$$\frac{3 \mathrm{~mL}^3}{8 \pi^2}$$
C
$$\frac{3 \mathrm{~mL}^3}{4 \pi^2}$$
D
$$\frac{3 \mathrm{~mL}^2}{7 \pi^2}$$
4
MHT CET 2023 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A black body radiates maximum energy at wavelength '$$\lambda$$' and its emissive power is '$$E$$'. Now due to a change in temperature of that body, it radiates maximum energy at wavelength $$\frac{\lambda}{3}$$. At that temperature emissive power is

A
$$16: 1$$
B
$$256: 1$$
C
$$81: 1$$
D
$$128: 1$$
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