1
VITEEE 2022
MCQ (Single Correct Answer)
+4
-1

A coil of 100 turns and area $$2 \times 10^{-2} \mathrm{~m}^2$$ is pivoted about a vertical diameter in a uniform magnetic field and carries a current of $$5 \mathrm{~A}$$. When the coil is held with its plane in North-South direction, it experiences a couple of $$0.33 \mathrm{~N}-\mathrm{m}$$. When the plane is East-West, the corresponding couple is $$0.4 \mathrm{~N}-\mathrm{m}$$. The value of magnetic induction is [Neglect earth's magnetic field]

A
$$0.2 \mathrm{~T}$$
B
$$0.3 \mathrm{~T}$$
C
$$0.4 \mathrm{~T}$$
D
$$0.05 \mathrm{~T}$$
2
VITEEE 2022
MCQ (Single Correct Answer)
+4
-1

A person is standing at some point between two parallel cliffs (not exactly at the centre). He claps, and hears two echoes: the first after $$1 \mathrm{~s}$$ and the second after $$2 \mathrm{~s}$$. If the speed of sound in air is $$330 \mathrm{~m} / \mathrm{s}$$, the distance between the two cliffs is

A

330 m

B

495 m

C

660 m

D

990 m

3
VITEEE 2022
MCQ (Single Correct Answer)
+4
-1

Light of wavelength $$\lambda$$ strikes a photoelectric surface and electrons are ejected with kinetic energy $$K$$. If $$K$$ is to be increased to exactly twice its original value, the wavelength must be changed to $$\lambda^{\prime}$$, such that

A
$$\lambda^{\prime}<\lambda / 2$$
B
$$\lambda^{\prime}>\lambda / 2$$
C
$$\lambda>\lambda^{\prime}>\frac{\lambda}{2}$$
D
$$\lambda^{\prime}=\frac{\lambda}{2}$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+4
-1

When in $$p$$-$$n$$ junction diode, $$p$$ is connected to the positive terminal and $$n$$ is connected to the negative terminal, then it is

A
forward bias
B
reverse bias
C
Both (a) and (b)
D
Neither (a) nor (b)

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