Unit 18: Electronics

1

In a transistor, current amplification occurs due to:

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

2

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

A Decreases B Remains same C Disappears D Increases

3

Which material is commonly used as a semiconductor?

A Copper B Silicon C Aluminium D Iron

4

Which device is considered the brain of digital systems?

A Relay B Logic gate C Resistor D Transformer

5

Which signal type is more resistant to noise?

A Analogue B Digital C Mechanical D Optical

6

The main advantage of digital electronics is:

A Complexity B Noise immunity C High cost D Large size

7

Which gate is known as a universal gate?

A AND B OR C NAND D XOR

8

A relay is an electrically operated:

A Capacitor B Switch C Resistor D Battery

9

Logic gates are mainly used in:

A Power transmission B Digital circuits C Heating devices D Motors

10

Which logic gate gives output 1 when inputs are different?

A AND B OR C XOR D NOR

11

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

12

The output of a NAND gate is 0 only when:

A Both inputs are 0 B Any input is 0 C Both inputs are 1 D Inputs are different

13

A transistor is mainly used for:

A Rectification B Amplification C Heating D Lighting

14

Relays are commonly used in circuits for:

A Signal generation B Voltage amplification C Switching high current loads D Energy storage

15

The basic unit of digital information is:

A Byte B Bit C Word D Nibble

16

The output of OR gate is 0 when:

A Any input is 1 B Both inputs are 1 C Both inputs are 0 D Only one input is 0

17

In digital electronics, logic 1 usually represents:

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

18

A PN junction is formed by joining:

A Two N-type materials B Two P-type materials C P-type and N-type materials D Metal and semiconductor

19

Which phenomenon allows qubits to be in multiple states?

A Diffraction B Superposition C Reflection D Refraction

20

Which device has three terminals named emitter, base, and collector?

A Diode B LED C Transistor D Relay

21

Which electronics branch deals with continuous signals?

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

22

LEDs are preferred over filament bulbs because they:

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

23

An LED emits light when it is:

A Reverse biased B Forward biased C Unbiased D Overheated

24

In electronics, biasing means:

A Breaking the circuit B Applying voltage C Removing current D Short circuiting

25

Which biasing allows maximum current through a diode?

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