pure resistor circuit the voltage and current are_______________? A. Lagging each other B. They are at 90? phase differenceC. They have zero phase difference D. No phase difference

An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ? A. I = 2I∫Sin(πt/2)B. I = 2I∫Sin(2πt) C. I…

To find the r.m.s value of an alternating current mathematically we need to have ________________? A. Mean value of I2B. Square root of mean value of I2 C. Square root of I2 D. Square of 1/2

A capacitor of capacitance 30µF is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ? A. 0.9sec B. 15 sec…

Electromagnetic waves emitted from antenna are________________? A. Stationary B. LongitudinalC. Transverse D. All the above

Electromagnetic waves transport___________________? A. Energy B. Momentum C. Mass D. Heat

The direction of propagation of an electromagnetic waves is________________? A. Perpendicular to electric fieldB. Perpendicular to both electric and magnetic field C. Perpendicular to magnetic field D. Parallel to electric and magnetic field

A changing magnetic flux produces around itself an induced_______________? A. Magnetic field B. Electric fieldC. Electromagnetic force D. Artificial gravitational field

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. 6.66AD. 5.66A

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 currentC. r.m.s current D.…