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 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A group of devices having a total power rating of 500 watt is supplied by an $$\mathrm{AC}$$ voltage $$E=200 \sin \left(3.14 t+\frac{\pi}{4}\right)$$. Then the r.m.s. value of the circuit current is

A
500 A
B
1 A
C
200 A
D
5 A
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An AC voltage source of variable angular frequency $$\omega$$ and fixed amplitude $$\mathrm{V}_0$$ is connected in series with a capacitance $$\mathrm{C}$$ and an electric bulb of resistance $$\mathrm{R}$$ (inductance zero). When $$\omega$$ is decreased

A
the bulb switches off
B
total impedance of the circuit is unchanged
C
the bulb glows brighter
D
the bulb glows dimmer
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A transformer which steps down $$330 \mathrm{~V}$$ to $$33 \mathrm{~V}$$ is to operate a device having impedance $$110 \Omega$$. The current drawn by the primary coil of the transformer is :

A
0.3 A
B
0.03 A
C
3 A
D
1.5 A
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A coil of inductance $$1 \mathrm{H}$$ and resistance $$100 \Omega$$ is connected to an alternating current source of frequency $$\frac{50}{\pi} \mathrm{~Hz}$$. What will be the phase difference between the current and voltage?

A
90$$^\circ$$
B
30$$^\circ$$
C
60$$^\circ$$
D
45$$^\circ$$
COMEDK Subjects