Question # 1

A potential barrier of 0.7V exists across p-n junction made from:

Choose an answer

Germanium

Silicon

Arsenic

Gallium

Indium

The number of LED'S needed to display all the digits is:

Choose an answer

Four

Five

Nine

Six

Seven

The concept of electric field theory was introduced by

Choose an answer

Michael Faraday

Newton

Dalton

Kepler

Einstein

In full wave rectification, simultaneous action is that:

Choose an answer

Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

In reverse-biased p-n junction, the reverse current is due to flow of:

Choose an answer

Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

If both the inputs given to a gate ae 1 such that the output is 0, then it is:

Choose an answer

AND gate

NOR gate

OR gate

NOT gate

Both (A) and (C)

Op-amp has been discussed as comparator of:

Choose an answer

Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

The number of input terminals of an op-amp is:

Choose an answer

One

Two

Three

Four

None of these

When transistors are used in digital circuits they usually operate in the

Choose an answer

Active region

Breakdown region

Saturation and cutoff regions

Linear region

The value of LDR depends upon intensity of:

Choose an answer

Sound falling on it

Current passing through it

Magnetic field surrounding it

Light falling on it

Non of these

In AND gate, the output is 1 if:

Choose an answer

Both inputs are 0

Both inputs are 1

Only one input is 0

Both (A) and (B)

Both (A) and (C)

The intensity at a point due to a charge is inversely proportional to

Choose an answer

Amount of charge

Size of the charge

Distance between charge and the point

Square of the distance from the charge

None of these

More Classes

Other Links

Physics ECAT Pre Engineering Chapter 18 Electronics Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer