Explore topic-wise MCQs in Physics.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

The power in an AC circuit contains an inductor of 30 mH, a capacitor of 300 μF, a resistor of 70 Ω, and an AC source of 24 V, 60 Hz. Calculate the energy dissipated in the circuit in 1000 s.

A. 8.22 J
B. 8.22 × 102 J
C. 8.22 × 103 J
D. 82.2 × 103 J
Answer» D. 82.2 × 103 J
Discussion
2.

What is the power factor for a series LCR circuit at resonance?

A. Infinity
B. -1
C. 0
D. 1
Answer» E.
Discussion
3.

Power factor has a unit of Watts.

A. True
B. False
Answer» C.
Discussion
4.

What is the power factor in a pure inductive or capacitive circuit?

A. -1
B. 0
C. 1
D. Infinity
Answer» C. 1
Discussion
5.

What is the power factor in a pure resistive circuit?

A. 0
B. -1
C. Infinity
D. 1
Answer» E.
Discussion
6.

Which of the following is true about power factor?

A. sin⁡Φ=\(\frac {True \, power}{Apparent \, power}\)
B. cosΦ=\(\frac {True \, power}{Apparent \, power}\)
C. sin⁡Φ=\(\frac {Apparent \, power}{True \, power}\)
D. cosΦ=\(\frac {Apparent \, power}{True \, power}\)
Answer» C. sin⁡Φ=\(\frac {Apparent \, power}{True \, power}\)
Discussion
7.

Apparent power is also known virtual power.

A. True
B. False
Answer» B. False
Discussion
8.

Identify the expression for average power.

A. Pav=\(\frac {V_o I_o}{2}\)sinΦ
B. Pav=\(\frac {V_o I_o}{2}\)cosΦ
C. Pav=\(\frac {V_o I_o}{4}\)cos⁡Φ
D. Pav=2VoIosin⁡Φ
Answer» C. Pav=\(\frac {V_o I_o}{4}\)cos⁡Φ
Discussion
9.

Which among the following varies in both magnitude and sign over a cycle?

A. Apparent power
B. Effective power
C. Instantaneous power
D. Average power
Answer» D. Average power
Discussion
10.

How many types of power can be defined in an AC circuit?

A. 3
B. 2
C. 1
D. 5
Answer» B. 2
Discussion