Physics Basic Unit#9 Test

The ratio of potential barriers for Ge to Si at room temperature is:

• 3/7

• 2/5

• 7/3

• 1/3

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

• 50 Hz

• 70.7 Hz

• 100 Hz

• 25 Hz

In the half-wave rectifier circuit shown. Which one of the following wave forms is true for VCD, the output across C and D?

• A

• B

• C

• D

In a bridge rectifier how many diodes conduct during each half cycle of input A.C

• 2

• 3

• 1

• ALL

In the given figure the current through the resistor is practically.

• 5 A

• Zero

• 2 A

• 1 A

Of the diodes shown in figure, which one is reverse biased?

• A

• B

• C

• D

In a half wave rectifier, the frequency of the input is N, the frequency and form of the output will be:

• N/2 and Pulsating

• N and Pulsating

• 2N and steady

• N and continuous

The most common device used as filter is

• Capacitor

• Resistor

• Transformer

• Transistor

The resistance of an ideal diode in reverse bias condition is

• Infinite

• Zero

• Finite

• Negative

In half wave rectifier, the output voltage is taken across

• Diode

• Both A and C

• Resistor

• Any of A or B