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

A rectifier is used to

A
convert a.c. to d.c.
B
amplify a weak signal
C
generate intermittent voltage
D
convert d.c. to a.c.
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two stars 'P' and 'Q' emit yellow and blue light respectively. The relation between their temperatures $$\left(\mathrm{T}_{\mathrm{P}}\right.$$ and $$\left.\mathrm{T}_{\mathrm{Q}}\right)$$ is

A
$$\mathrm{T_P=T_Q}$$
B
$$\mathrm{T}_{\mathrm{P}}=\frac{\mathrm{T}_{\mathrm{Q}}}{2}$$
C
$$\mathrm{T}_{\mathrm{P}}>\mathrm{T}_{\mathrm{Q}}$$
D
$$\mathrm{T}_{\mathrm{P}}<\mathrm{T}_{\mathrm{Q}}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Inside a vessel filled with liquid a converging lens is placed as shown in figure. The lens has focal length $$15 \mathrm{~cm}$$ when in air and has refractive index $$\frac{3}{2}$$. If the liquid has refractive index $$\frac{9}{5}$$, the focal length of lens in liquid is

MHT CET 2021 20th September Evening Shift Physics - Ray Optics Question 28 English

A
15 cm
B
$$-$$60 cm
C
90 cm
D
$$-$$45 cm
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A metal wire of length $$2500 \mathrm{~m}$$ is kept in east-west direction, at a height of $$10 \mathrm{~m}$$ from the ground. If it falls freely on the ground then the current induced in the wire is (Resistance of wire $$=25 \sqrt{2} \Omega, \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$$ and Earth's horizontal component of magnetic field $$\left.\mathrm{B}_{\mathrm{H}}=2 \times 10^{-5} \mathrm{~T}\right)$$

A
0.2 A
B
0.02 A
C
0.01 A
D
2 A
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