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 F, a resistor of 70 , 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 10<sup>2</sup> J
C. 8.22 10<sup>3</sup> J
D. 82.2 10<sup>3</sup> J
Answer» D. 82.2 10<sup>3</sup> 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 u2061 = ( frac {True , power}{Apparent , power} )
B. cos = ( frac {True , power}{Apparent , power} )
C. sin u2061 = ( frac {Apparent , power}{True , power} )
D. cos = ( frac {Apparent , power}{True , power} )
Answer» C. sin u2061 = ( 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. P<sub>av</sub>= ( frac {V_o I_o}{2} )sin
B. P<sub>av</sub>= ( frac {V_o I_o}{2} )cos
C. P<sub>av</sub>= ( frac {V_o I_o}{4} )cos u2061
D. P<sub>av</sub>=2V<sub>o</sub>I<sub>o</sub>sin u2061
Answer» C. P<sub>av</sub>= ( frac {V_o I_o}{4} )cos u2061
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