Question 4676:

A p-m junction diode is used as ____________

A. A rectifier in a d.c circuit
B. An amplifier in an a.c circuit
C. A rectifier in an a.c circuit
D. An amplifier in a d.c circuit

Question 4677:

The sharpness of the boundaries of the shadow of an object is determined by the ____________

A. Rays of light passing through the object
B. Intensity of light striking the object
C. Opacity of the object
D. Nature of the object

Question 4678:

A body of mass \(4 \mathrm{~kg}\) is acted on by a constant force of \(12 \mathrm{~N}\) for 3 seconds.
The kinetic energy gained by the body at the end of the time is ____________

A. 162J
B. 144J
C. 72J
D. 81J

Question 4679:

Two inductors of inductances \(4 \mathrm{H}\) and \(8 \mathrm{H}\) are arranged in series and a current of \(10 \mathrm{~A}\) is passed through them.
What is the energy stored in them?

A. 500J
B. 50J
C. 133J
D. 250J

Question 4680:

Which of the following will be applied when a metal \(Y\) is used to electroplate another metal \(X\) in electrolysis?

A. \(Y\) is the anode and very high current is used
B. \(X\) is the anode and \(Y\) is the cathode
C. \(Y\) is the cathode and \(X\) is the anode
D. \(X\) is the anode and very high current is used