Deck 6: Electrical and Digital Concepts and Terminology

Question 1

Each digit in a binary number is known as a

A)bit
B)byte
C)number
D)digit

Answer 1

bit

Question 2

Value of sampled signal is used to produce a

A)binary number
B)decimal number
C)octal number
D)all of above

Answer 2

binary number

Question 3

Data in compact disc is stored in form of

A)analogue signal
B)digital signal
C)noise
D)colors

Answer 3

digital signal

Question 4

With a 30 m long coaxial cable, the bandwidth can exceed

A)100 MHz
B)1000 MHz
C)50 MHz
D)300 MHz

Question 5

Amplitude of modulated wave is in phase with

A)output
B)system
C)frequency
D)signal

Question 6

Variation in amplitude or frequency of carrier wave is called

A)amplitude modulation
B)frequency modulation
C)modulation
D)bandwidth

Question 7

In frequency modulation, amplitude of modulated wave is

A)positive
B)negative
C)constant
D)zero

Question 8

High quality music only needs frequencies up to

A)10 Hz
B)15 Hz
C)20 kHz
D)15 kHz

Question 9

Binary system has base

A)10
B)11
C)1
D)2

Question 10

In FM, frequency of modulated wave varies with

A)amplitude
B)time
C)wavelength
D)energy

Question 11

Unwanted signal that distorts a transmitted signal is called

A)analogue
B)noise
C)digital
D)tuning

Question 12

First communication satellites used frequencies of

A)6 GHz for uplink
B)3 GHz for uplink
C)6 GHz for downlink
D)5 GHz for downlink

Question 13

A wave of frequency 1 GHz has wavelength of

A)0.4 m
B)0.5 m
C)0.2 m
D)0.3 m

Question 14

Semiconductors have electron number density of order{{}}

A)10 ²⁴ m^-3
B)10 ²⁰ m^-3
C)10 ¹² m^-3
D)10 ²³ m^-3

Question 15

A straight line symbol shows the

A)fuse
B)diode
C)connecting lead
D)switch

Question 16

Rate of flow of electric charge is

A)electric current
B)conventional current only
C)electronic current only
D)potential difference

Question 17

instrument which transfers energy to electric charges in a circuit is

A)battery
B)voltmeter
C)ammeter
D)galvanometer

Question 18

Electric power is related to

A)current in component
B)potential difference
C)electrical resistance
D)both A and B

Question 19

If a current of 1 A passes through a point in 1 s then charge passes that point is

A)2 C
B)3 C
C)1 C
D)6 C

Question 20

Energy transferred per unit charge is

A)e.m.f
B)current
C)potential difference
D)conventional current

Question 21

Current in a circuit when a charge of 180 C passes a point in a circuit in 2 minutes is

A)1:00 AM
B)2:00 AM
C)3:00 AM
D)1.5 A

Question 22

Electrons which are free to move around are also called

A)conduction electrons
B)valence shell electrons
C)inner electrons
D)electron sea

Question 23

Number of conduction electrons per unit volume is

A)electron number
B)number density
C)proton number
D)neutron number

Question 24

Current in a circuit if resistance of 15 Ω and potential difference of 3.0 V is applied across it's ends is

A)1 A
B)2 A
C)0.5 A
D)0.20 A

Question 25

Number density for copper is {{}}

A)10^-29 m^-3
B)10 ³⁰m^-3
C)10 ²⁹ m^-3
D)10 ²⁰ m^-3