1
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

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

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

A galvanometer of resistance $50 \Omega$ is having 30 divisions and a current sensitivity $10 \mathrm{~mA} /$ div. What should be the shunt resistance so that it can be converted into an ammeter of range 10 A ?

A

$0.76 \Omega$

B

$2.5 \Omega$

C

$1.55 \Omega$

D

$3.1 \Omega$

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

A block of mass 1.5 kg moves along the floor of a hall with a speed of $5 \mathrm{~ms}^{-1}$. It strikes an uncompressed spring and compresses it till the block becomes motionless. If the force constant of the spring is $10000 \mathrm{Nm}^{-1}$ and the spring is compressed by 5 cm , calculate the effective force of kinetic friction.

A

125 N

B

18.7 N

C

0

D

16.4 N

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

Find the current through the $40 \Omega$ resistor in the given circuit having a diode, three resistors and two cells.

COMEDK 2026 Afternoon Shift Physics - Semiconductor Devices and Logic Gates Question 1 English
A

0.21 A

B

0.5 A

C

1.2 A

D

2.1 A