Unit 18: Electronics + Unit 19: Electromagnetism

1

The strength of magnetic field around a current carrying wire depends on:

A Length of wire B Material of wire C Current through the wire D Color of wire

2

Magnetic flux is measured in:

A Tesla B Weber C Henry D Farad

3

The electrical conductivity of a semiconductor lies between:

A Conductors and insulators B Only conductors C Only insulators D Superconductors

4

Analogue signals vary:

A In steps B Digitally C Continuously D Randomly

5

LEDs are preferred over filament bulbs because they:

A Consume more power B Produce heat C Have longer life D Are fragile

6

Which charge carriers are majority carriers in N-type semiconductors?

A Holes B Protons C Electrons D Neutrons

7

An electromagnet becomes stronger when:

A Current is reduced B Number of turns is increased C Wire is made thinner D Battery is removed

8

In reverse biasing of a diode, the width of depletion region:

A Decreases B Remains same C Disappears D Increases

9

An LED emits light when it is:

A Reverse biased B Forward biased C Unbiased D Overheated

10

Which biasing allows maximum current through a diode?

A Reverse biasing B Zero biasing C Forward biasing D Negative biasing

11

Digital electronics deals with signals that are:

A Continuous B Random C Binary D Analogue

12

A transistor is mainly used for:

A Rectification B Amplification C Heating D Lighting

13

The basic unit of digital information is:

A Byte B Bit C Word D Nibble

14

The majority charge carriers in P-type material are:

A Electrons B Ions C Holes D Neutrons

15

The magnetic field of Earth is similar to that of:

A A straight wire B A solenoid C A bar magnet D An electric motor

16

Which logic gate gives output 1 when inputs are different?

A AND B OR C XOR D NOR

17

Which gate is known as a universal gate?

A AND B OR C NAND D XOR

18

In digital electronics, logic 1 usually represents:

A Zero voltage B Negative voltage C High voltage D No signal

19

Quantum computers are expected to be very powerful in:

A Simple calculations B Complex problem solving C Word processing D Printing

20

When a transistor is used as a switch, it operates in:

A Active region B Cut-off and saturation regions C Linear region D Breakdown region

21

Which electronics field is mainly used in computers?

A Analogue electronics B Digital electronics C Power electronics D Thermal electronics

22

In a transistor, current amplification occurs due to:

A Large base current B Small base current C No base current D High voltage

23

Cathode rays consist of:

A Protons B Neutrons C Electrons D Photons

24

The angle made by Earth’s magnetic field with the horizontal is called:

A Declination B Inclination C Deviation D Rotation

25

Which device converts mechanical energy into electrical energy?

A Motor B Transformer C Generator D Battery