1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A plane glass mirror of thickness $$3 \mathrm{~cm}$$ of material of $$\mu=\frac{3}{2}$$ is silvered on the back surface. When a point object is placed $$9 \mathrm{~cm}$$ from the front surface of the mirror, then the position of the brightest image from the front surface is

A
9 cm
B
11 cm
C
12 cm
D
13 cm
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A skylab or mass $$m \mathrm{~kg}$$ is first launched from the surface of the earth in a circular orbit of radius $$2 R$$ (from the centre of the earth) and then it is shifted from this circular orbit to another circular orbit of radius $$3 R$$. The minimum energy required to place the lab in the first orbit and to shift the lab from first orbit to the second orbit are

A
$$\frac{3}{4} m g R, \frac{m g R}{6}$$
B
$$\frac{3}{4} m g R, \frac{m g R}{12}$$
C
$$m g R, m g R$$
D
$$2 m g R, m g R$$
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A train has to negotiate a curve of radius $$400 \mathrm{~m}$$. By how much should the outer rail be raised with respect to the inner rail for a speed of $$48 \mathrm{~km} / \mathrm{h}$$ ? The distance between the rails is $$1 \mathrm{~m}$$.

A
1.5 cm
B
2.5 cm
C
3.5 cm
D
4.5 cm
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

From Wien's displacement law, $$\lambda_m T=$$ constant $$=0.00289 \mathrm{~m}-\mathrm{K}$$

Radiation from moon givens $$\lambda_m=4700 \mathop A\limits^o$$ and another wavelength of $$14 \times 10^{-6} \mathrm{~m}$$. Out of the following which conclusion(s) drawn is/are correct with the given information regarding the moon and the sun?

1. Sun radiations are reflected from moon's disc.

2. The temperature of moon's surface is $$207 \mathrm{~K}$$

3. The temperature of the sun is $$6160 \mathrm{~K}$$.

A
Only 1
B
Both 1 and 2
C
Both 2 and 3
D
1, 2 and 3
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