Question # 1

What is emitted by the hot metal filament in a cathode ray tube.

Choose an answer

Alpha particles

Electrons

Protons

X rays

The device in the circuit that consume electrical energy are known as.

Choose an answer

Resistors

Capacitors

Fuses

Load

A semiconductor diode conducts only when it is

Choose an answer

Not biased

Zero biased

Reverse biased

Forward and biased

in the region where the field lines are parallel and equally spaced, the field is.

Choose an answer

Zero

Unirorm

Non uniform

Negative

Resistance and resistivity of a substance

Choose an answer

Increase with rise in temperature

Decrease with rise in temperature

Remains same at every temperature

Increases at high voltage

Which one of the following represents an ohm.

Choose an answer

Volt per ampere

Joule per second

Watt per ampere

Joule per coulomb

Magnetic moment is a

Choose an answer

Scalar

Vector

Phasor

Tensor

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

Choose an answer

5 A

10 A

12 A

15 A

The highest value reached by the voltage or current in one cycle is its.

Choose an answer

Top value

Maximum value

Average value

Peak value

With high frequencies capacitive reactance

Choose an answer

Increases

Decreases

Becomes double

Becomes half

In the equation P = IV cos Theta Cos theta is known as

Choose an answer

Phase angle

Liming angle

Phase

Power factor

An ideal voltage source has zero.

Choose an answer

Current

Electromotive force

Voltage

Internal resistance

When the number of turns in the solenoid is doubled without any change in teh length of the solenoid its self inductance will be.

Choose an answer

Halved

Doubled

4 times

8 times

Which equation in electromagnetism describe the magnetic field B generated by an electric current.

Choose an answer

ampere's circuital law

Bio savart law

Gauss's law for electromagnetism

Coulomb's law

The material of an electromagnet should have high

Choose an answer

Permeability

susceptibility

Retentivity

Hysteresis loss

In a half wave rectifier the rms value of the A.C. component of the wave is.

Choose an answer

Less than D.C. value

Great her than D.C. value

Equal to D.C. value

Zero

With increase in temperature the electrical conductivity of intrinsic conductors.

Choose an answer

Increases

Descreases

Remain unaffected

First increases then decreases

A germanium atom is

Choose an answer

Monovalent

Diavalent

Travalent

Tetravalent

A p-type material is formed then a semiconductor is doped with

Choose an answer

Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

The circuit in which current and voltage are in phase the power factor is.

Choose an answer

Zero

Unity

Double

4 times

How eddy current losses are reduced in A F and R F transformers.

Choose an answer

By using air cores

By using shell cores

By using laminated cores

By using ferrite cores

More Classes

Other Links

PPSC Physics Chapter 6 Electricity and Magnetism 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

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