1
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
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A disc of $$10.0 \mathrm{~cm}$$ diameter is rotated at speed of $$3600 \mathrm{~rpm}$$ inside a long solenoid of 1200 turns per metre on the axis of the solenoid and perpendicular to the plane of the disc. When a current of $$1.5 \mathrm{~A}$$ is passed through the solenoid, the difference in the potential between axes and circumference of the disc is nearly

A
0.108 mV
B
1.08 mV
C
0.108 $$\mu$$V
D
1.08 $$\mu$$V
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

If two metallic plates of equal thickness and thermal conductivities $$K_1$$ and $$K_2$$ are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

A
$$\frac{K_1 K_2}{K_1+K_2}$$
B
$$\frac{2 K_1 K_2}{K_1+K_2}$$
C
$$\frac{\left(K_1^2+K_2^2\right)^{3 / 2}}{K_1 K_2}$$
D
$$\frac{\left(K_1^2+K_2^2\right)^{3 / 2}}{2 K_1 K_2}$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

Which of the following is arranged in forward bias?

A
VITEEE 2022 Physics - Semiconductor Devices and Logic Gates Question 3 English Option 1
B
VITEEE 2022 Physics - Semiconductor Devices and Logic Gates Question 3 English Option 2
C
VITEEE 2022 Physics - Semiconductor Devices and Logic Gates Question 3 English Option 3
D
VITEEE 2022 Physics - Semiconductor Devices and Logic Gates Question 3 English Option 4
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