Electrical Questions

Electrical Questions

1.The number of micro amperes in 2 milli amperes is?
A.2 μA
B.20 μA
C.200 μA
D.2,000 μA
Ans: D

2.If the diameter of a conductor of 10 ohms is doubled, its new resistance would be?
A.20 ohms
B.5 ohms
C.40 ohms
D.2.5 ohms
Ans: D

3.What amount of current will flow through resistance of 10 ohms when it is connected across a potential
difference of 20 volts?
A.30 amperes
B.5 amperes
C.10 amperes
D.2 amperes
Ans: D

4.Resistance is measured in?
A.henries
B.ohms
C.hertz
D.watts
Ans: B

5.Eighteen thousand watts is the same as?
A.18 mW
B.18 MW
C.18 kW
D.18 μW
Ans: C

6.If an incandescent lamp of 80 ohms resistance takes a current of 0.75 ampere, what voltage is required to light it?
A.45 volts
B.60 volts
C.23 volts
D.None of these
Ans: B

7.Materials with lots of free electrons are called?
A.conductors
B.insulators
C.semiconductors
D.filters
Ans: A

8.A thermistor is a type of?
A.switch
B.resistor
C.battery
D.power supply
Ans: B

9. A constant load power means a uniform conversion of?
A.mechanical to electrical energy
B.electrical to mechanical energy
C.current to voltage
D.voltage to current
Ans: B

10.The minimum resistance value for a blue, gray, red, silver resistor is?
A.612 ohms
B.6,120 ohms
C.6,800 ohms
D.6,460 ohms
Ans: B

11.Current flows in a circuit when?
A.a switch is opened
B.a switch is closed
C.the switch is either open or closed
D.there is no voltage
Ans: B

12.Electrons in the outer orbit are called?
A.nuclei
B.valences
C.waves
D.shells
Ans: B

13.A material that does not allow current under normal conditions is a(n)?
A.insulator
B.conductor
C.semiconductor
D.valence
Ans: A

14.The formula to find I when the values of V and R are known is?
A.I = VR
B.I = R/V
C.V = IR
D.I = V/R
Ans: D

15.Which of the following is not an electrical quantity?
A.voltage
B.current
C.distance
D.power
Ans: C