# Alternating Current 12 Class FSC Physics MCQs

FSC Physics MCQs Part 2 Physics Part 2 HSSC Pre Medical Pre Engineering text Book Questions first year and second-year Physics mcqs

A changing magnetic flux produces around itself an induced
A. Magnetic field B. Electric field
C. Electromagnetic force D. Artificial gravitational field
C
The direction of propagation of an electromagnetic waves is
A. Perpendicular to electric field B. Perpendicular to both electric and magnetic field
C. Perpendicular to magnetic field D. Parallel to electric and magnetic field
B
An electromagnetic wave consists of
A. Electric and magnetic fields moving parallel to each other B. Magnetic field moving with velocity of light in space
C. Electric field moving with velocity of light D. Electric and magnetic fields moving perpendicular to each other
D
Waves emitted from the antenna are
A. Sound waves B. Electromagnetic waves
C. Radio waves D. Modulated waves
B
If capacitance of L-C circuit is made four times then frequency of the circuit becomes
A. Twice B. One half
C. Four times D. None
B
The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is
A. Average current B. Sinusoidal current
C. r.m.s current D. Net current
C
An alternating current of r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing 10? resistor. The peak current is then
A. 20A B. 20.66A
C. 6.66A D. 5.66A
D
pure resistor circuit the voltage and current are
A. Lagging each other B. They are at 90? phase difference
C. They have zero phase difference D. No phase difference
C
A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit
A. Remains B. Becomes infinite
C. Becomes zero D. Increases