1
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

2
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

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

A metallic circular loop is placed with its plane perpendicular to a uniform magnetic field of 0.3 T . If the radius of the loop decreases at a constant rate of $2 \mathrm{~mm} \mathrm{~s}^{-1}$, what will be the induced emf in the loop, when the radius of the loop becomes 5 cm .

A

$1.5 \times 10^{-6} V$

B

$0.75 \times 10^{-6} V$

C

$1.84 \times 10^{-6} V$

D

$1.89 \times 10^{-4} V$

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

What is the minimum wavelength of radiation required to detect a p-n junction diode made of a semiconductor having band gap 3.3 eV .

[Planck's constant $h=6.6 \times 10^{34} \mathrm{~J} . \mathrm{s}$ ]

A

$3300^{\circ} \mathrm{A}$

B

$4800^{\circ} \mathrm{A}$

C

$3750^{\circ} \mathrm{A}$

D

$7500^{\circ} \mathrm{A}$