Electromagnetism
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Alternating Current
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Dual Nature of Radiation
MCQ (Single Correct Answer)
Semiconductor Devices and Logic Gates
MCQ (Single Correct Answer)
Communication Systems
MCQ (Single Correct Answer)
1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

An alternating voltage = 200 $$\sin 100t$$ is applied to a series combination of $$R=30\Omega$$ and an inductor of 400 mH. The power factor of the circuit is,

A
0.01
B
0.6
C
0.05
D
0.042
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

The AC voltage across a resistance can be measured using a

A
hot wire voltmeter
B
moving coil galvanometer
C
potential coil galvanometer
D
moving magnetic galvanometer
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The formula of capacitative reactance is

A
$$2\pi fC$$
B
$$\frac{fC}{2\pi}$$
C
$$\frac{C}{2\pi f}$$
D
$$\frac{1}{2\pi fC}$$
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

For the same resonant frequency, if L is changed from L to $${L \over 3}$$, then capacitance should change from C to

A
$${C \over 3}$$
B
$$3C$$
C
$${2 \over 3}C$$
D
$$2C$$
COMEDK Subjects