1
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

If the ratio of the nuclear radii of two atoms is $2: 3$ then the ratio of their mass numbers is:

A

$8: 27$

B

$4:9$

C

$ 27:8$

D

$9: 4$

2
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of the angle of deviation produced by a thin prism, when it is placed in air to the angle of deviation produced when it is immersed in water of refractive index $\frac{4}{3}$ is:

A

$4: 1$

B

$8: 9$

C

$ 9:8$

D

$1: 4$

3
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A vessel of volume $27 \times 10^4 \mathrm{cc}$, contains a mixture of Hydrogen (molar mass $=2 \mathrm{~g} \mathrm{~mol}^{-1}$ ) and oxygen (molar mass $=32 \mathrm{~g} \mathrm{~mol}^{-1}$ ) gas at standard temperature and pressure. If the mass of hydrogen is 16 g , find the mass of oxygen gas contained in the vessel.

A

160 g

B

129.7 g

C

64 g

D

72 g

4
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In a uniform electric field $10^6 N C^{-1}$ an electric dipole of length 4 cm is placed with its axis making an angle $60^{\circ}$ with the electric field. If the dipole experiences a torque of $8 \sqrt{3} \mathrm{~N} \mathrm{~m}$.

Find the potential energy of the dipole.

A

$-8 J$

B

$ 8 J$

C

$-16 J$

D

$16 J$