1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Three bulbs of $$40 \mathrm{~W}, 60 \mathrm{~W}$$, and $$100 \mathrm{~W}$$ are arranged in series with a $$220 \mathrm{~V}$$ source. The maximum light is obtained from

A
40 W
B
60 W
C
All give the same light
D
100 W
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A photon emitted during the de-excitation of electron from a state $$\mathrm{n}$$ to the second excited state in a hydrogen atom, irradiates a metallic electrode of work function $$0.5 \mathrm{~eV}$$, in a photocell, with a stopping voltage of $$0.47 \mathrm{~V}$$. Obtain the value of quantum number of the state '$$n$$'.

A
5
B
6
C
4
D
3
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The acceleration due to gravity at pole and equator can be related as

A
$$g_e=g_p < g$$
B
$$g_e=g_p=g$$
C
$$g_e < g_p$$
D
$$g_e > g_p$$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved, by rotating it, the angle by which it is to be rotated is

A
$$90^{\circ}$$
B
$$30^{\circ}$$
C
$$60^{\circ}$$
D
$$45^{\circ}$$
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