1
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

An electromagnetic wave, whose wave normal makes an angle of $$45^{\circ}$$ with the vertical, travelling in air strikes a horizontal liquid surface. While travelling through the liquid it gets deviated through $$15^{\circ}$$. What is the speed of the electromagnetic wave in the liquid, if the speed of electromagnetic wave in air is $$3 \times 10^8 \mathrm{~m} / \mathrm{s}$$ ? $$\left(\sin 30^{\circ}=0.5, \sin 45^{\circ}=\frac{1}{\sqrt{2}}\right)$$

A
$$\frac{\sqrt{2}}{3} \times 10^8 \mathrm{~m} / \mathrm{s}$$
B
$$1.5 \times 10^8 \mathrm{~m} / \mathrm{s}$$
C
$$2.1 \times 10^8 \mathrm{~m} / \mathrm{s}$$
D
$$2.5 \times 10^8 \mathrm{~m} / \mathrm{s}$$
2
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The difference in length between two rods $$\mathrm{A}$$ and $$\mathrm{B}$$ is $$60 \mathrm{~cm}$$ at all temperatures. If $$\alpha_{\mathrm{A}}=18 \times 10^{-6} /{ }^{\circ} \mathrm{C}$$ and $$\beta_{\mathrm{B}}=27 \times 10^{-6} /{ }^{\circ} \mathrm{C}$$, the lengths of the two rods are

A
$$l_{\mathrm{A}}=200 \mathrm{~cm}, l_{\mathrm{B}}=140 \mathrm{~cm}$$
B
$$l_{\mathrm{A}}=180 \mathrm{~cm}, l_{\mathrm{B}}=120 \mathrm{~cm}$$
C
$$l_{\mathrm{A}}=160 \mathrm{~cm}, l_{\mathrm{B}}=100 \mathrm{~cm}$$
D
$$l_{\mathrm{A}}=120 \mathrm{~cm}, l_{\mathrm{B}}=60 \mathrm{~cm}$$
3
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A parallel plate capacitor is charged by a battery and battery remains connected. The dielectric slab of constant '$$\mathrm{K}$$' is inserted between the plates and then taken out. Then electric field between the plates

A
remains the same
B
increases
C
decreases
D
becomes zero
4
MHT CET 2023 11th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

From a disc of mass '$$M$$' and radius '$$R$$', a circular hole of diameter '$$R$$' is cut whose rim passes through the centre. The moment of inertia of the remaining part of the disc about perpendicular axis passing through the centre is

A
$$\frac{13 \mathrm{MR}^2}{32}$$
B
$$\frac{11 \mathrm{MR}^2}{32}$$
C
$$\frac{9 \mathrm{MR}^2}{32}$$
D
$$\frac{7 \mathrm{MR}^2}{32}$$
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