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

The material selected for making a permanent magnet should have:

A

High coercivity, low permeability and high retentivity

B

Low coercivity, low permeability and low retentivity

C

Low coercivity, low permeability and high retentivity

D

High coercivity, high permeability and high retentivity

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

Calculate the vapour pressure that can help the formation of a spherical droplet of water of radius $6.25 \times 10^{-5} \mathrm{~m}$ at $22^{\circ} \mathrm{C}$. Given: The surface tension of water at the given temperature is $7.28 \times 10^{-2} \mathrm{Nm}^{-1}$.

A

$1.01 \times 10^5 \mathrm{~Pa}$

B

$2.33 \times 10^3 \mathrm{~Pa}$

C

$8.81 \times 10^3 \mathrm{~Pa}$

D

$6.64 \times 10^4 \mathrm{~Pa}$

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

The atomic mass of an element $10 X^{20}$ is 19.98170 amu. The binding energy per nucleon of that element is: [given mass of neutron = 1.00867amu and mass of proton = 1.00783 amu and 1amu = 931 MeV ]

A

$17.66 \mathrm{MeV} /$ nucleon

B

$ 8.533 MeV /$ nucleon

C

$85.33 \mathrm{MeV} /$ nucleon

D

$170.66 \mathrm{MeV} /$ nucleon

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

Find the mass of oxygen gas with which $1.882 \times 10^{23}$ degrees of freedom are associated at N.T.P. Given: Molar mass of diatomic gas, oxygen is $32 \mathrm{~g} \mathrm{~mol}^{-1}$ and oxygen molecule possess three translational and two rotational degrees of freedom.

A

32 g

B

5 g

C

16 g

D

2 g