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

A bar magnet suspended by a horse's hair lies in the magnetic meridian where there is no twist in the hair, on turning the upper end of the hair through $$150^{\circ}$$, the magnet is deflected through $$30^{\circ}$$ from the meridian. Then the angle through which upper end of the hair has to be twisted to deflect the magnet through $$90^{\circ}$$ from the meridian is

A
$$450^{\circ}$$
B
$$360^{\circ}$$
C
$$330^{\circ}$$
D
$$150^{\circ}$$
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

If the ratio of specific heat of a gas at constant pressure to that at constant volume is $$\gamma$$, the change in internal energy of the given mass of gas, when the volume changes from $$V$$ to $$2 V$$ at constant pressure $$p$$ is

A
$$R /(\gamma-1)$$
B
$$\mathrm{pV}$$
C
$$p V /(\gamma-1)$$
D
$$g p V /(\gamma-1)$$
3
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

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
$$0.05 \mathrm{~T}$$
4
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A man stands between two parallel cliffs (not in middle). When he claps his hands, he hears two echoes one after is and the other after $$2 \mathrm{~s}$$. If the velocity of sound in air is $$330 \mathrm{~m} / \mathrm{s}$$, the width of the cliff is

A
330 m
B
495 m
C
660 m
D
990 m
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