An alternating current or voltage_____________________?

A. Fluctuates off and on
B. Varies in magnitude alone
C. Changes its direction again and again
D. Changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals

Electromagnetic waves travel in free space with the speed of___________________?

A. Λ-rays
B. Positive rays
C. Cathode rays
D. More than sound waves

Waves emitted from the antenna are__________________?

A. Sound waves
B. Electromagnetic waves
C. Radio waves
D. Modulated waves

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

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

An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?

A. 20a
B. 20.66a
C. 6.66a
D. 5.66a

A changing magnetic flux produces around itself an induced_______________?

A. Magnetic field
B. Electric field
C. Electromagnetic force
D. Artificial gravitational field

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

Electromagnetic waves transport___________________?

A. Energy
B. Momentum
C. Mass
D. Heat

Electromagnetic waves emitted from antenna are________________?

A. Stationary
B. Longitudinal
C. Transverse
D. All the above