1
MHT CET 2023 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two trains, each $$30 \mathrm{~m}$$ long are travelling in opposite directions with velocities $$5 \mathrm{~m} / \mathrm{s}$$ and $$10 \mathrm{~m} / \mathrm{s}$$. They will cross after

A
4 s
B
3 s
C
2 s
D
1 s
2
MHT CET 2023 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The fundamental frequency of air column in pipe 'A' closed at one end is in unison with second overtone of an air column in pipe 'B' open at both ends. The ratio of length of air column in pipe '$$\mathrm{A}$$' to that of air column in pipe '$$\mathrm{B}$$' is

A
$$1: 6$$
B
$$3: 8$$
C
$$2: 3$$
D
$$3: 4$$
3
MHT CET 2023 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In Young's double slit experiment, the two slits are 'd' distance apart. Interference pattern is observed on a screen at a distance 'D' from the slits. A dark fringe is observed on a screen directly opposite to one of the slits. The wavelength of light is

A
$$\frac{\mathrm{D}^2}{2 \mathrm{~d}}$$
B
$$\frac{\mathrm{d}^2}{2 \mathrm{D}}$$
C
$$\frac{\mathrm{D}^2}{\mathrm{~d}}$$
D
$$\frac{d^2}{D}$$
4
MHT CET 2023 10th 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 change in temperature of that body, it radiates maximum energy at wavelength $$\frac{2 \lambda}{3}$$. At that temperature emissive power is

A
$$\frac{81}{16}$$
B
$$\frac{27}{32}$$
C
$$\frac{18}{10}$$
D
$$\frac{9}{4}$$
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