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

The radius of a nucleus as measured by electron scattering is $$4.8 \mathrm{~fm}$$. The mass number of nucleus is most likely to be

A
46
B
16
C
64
D
48
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Light enters at an angle of incidence in a transparent rod of refractive index '$$n$$'. The least value of '$$n$$' for which the light once entered into it will not leave it through its lateral face whatsoever be the value of the angle of incidence is

A
$$\sqrt{2}$$
B
1.5
C
2
D
1.3
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A cubical box of side $$2 \mathrm{~m}$$ contains helium gas. It was observed that in a time of 1 second, an atom travelling with the root-mean-square speed parallel to one of the edges of the cube, made 250 hits with one of the walls, without any collision with other atoms. The average kinetic energy of the helium gas is Take $$R=\frac{25}{3} \mathrm{~J} / \mathrm{mol}-\mathrm{K}$$ and $$\mathrm{kB}=1.38 \times 10^{-23} \mathrm{JK}{ }^{-1}$$

A
$$ 82.8 \times 10^{-21} \mathrm{~J} $$
B
$$ 3.31 \times 10^{-21} \mathrm{~J} $$
C
$$ 82.8 \times 10^{-19} \mathrm{~J} $$
D
$$ 1 \times 10^{-21} \mathrm{~J} $$
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A circular disc of mass $$20 \mathrm{~kg}$$, having radius $$10 \mathrm{~cm}$$ is suspended by a wire attached to its centre. The wire is twisted by rotating the disc and released. The time period of torsional oscillations is found to be $$1 \mathrm{~s}$$. The torsional spring constant of the wire is

A
$$6 \mathrm{~N~m} \mathrm{~rad}^{-1}$$
B
$$9.86 \mathrm{~N~m} \mathrm{~rad}^{-1}$$
C
$$3.94 \mathrm{~N~m} \mathrm{~rad}^{-1}$$
D
$$1.264 \mathrm{~N~m} \mathrm{~rad}^{-1}$$
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