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

The coefficient of volume expansion of glycerine is $$49 \times 10^{-5} \mathrm{~K}^{-1}$$. The percentage change in its density for a $$50^{\circ} \mathrm{C}$$ rise in temperature is

A
3.54
B
5.24
C
4.25
D
2.45
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A current I flows in an infinitely long wire with cross section in the form of semi-circular ring of radius $$1 \mathrm{~m}$$. The magnitude of the magnetic induction along its axis is

A
$$\frac{\mu_0 \mathrm{I}}{2 \pi} \mathrm{T}$$
B
$$\frac{\mu_0 \mathrm{I}}{\pi^2} \mathrm{~T}$$
C
$$\frac{\mu_0 \mathrm{I}}{4 \pi^2} \mathrm{~T}$$
D
$$\frac{\mu_0 \mathrm{I}}{2 \pi^2} \mathrm{~T}$$
3
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
4
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
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