# Basic Electrical Engineering Quiz: Test!

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| By Ashish Desai
A
Ashish Desai
Community Contributor
Quizzes Created: 1 | Total Attempts: 3,123
Questions: 10 | Attempts: 3,139

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• 1.

### What is the unit of current?

• A.

Ampere

• B.

Voltage

• C.

Meter

• D.

None of above

A. Ampere
• 2.

### Which of the following materials possesses the least specific resistivity?

• A.

Aluminium

• B.

Copper

• C.

Silver

• D.

Iron

• E.

None of Above

C. Silver
Explanation
The resistivity of silver is about 1.59 × 10−8 Ωm at 20 degrees Celsius.

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• 3.

• A.

Linear

• B.

Hyperbolic

• C.

Parabolic

• D.

Triangular

A. Linear
• 4.

### The SI unit of electrical energy is?

• A.

Watt-Second

• B.

Joule

• C.

KWh

• D.

Volt-Ampere Second

B. Joule
Explanation
Joule is the SI Unit of Energy all others are the unit of Energy but not the SI Unit of energy.

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• 5.

### Two wires A and B of the same Material but of different lengths L and 2L have the radius r and 2r respectively. The ratio of specific resistance will be?

• A.

1:4

• B.

1:8

• C.

1:1

• D.

1:2

C. 1:1
Explanation
As the materials are same (pA=pB) the ratio will be 1:1

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• 6.

### Four resistances 2Ω,4Ω,5Ω,20Ω

• A.

1Ω

• B.

2Ω

• C.

4Ω

• D.

5Ω

A. 1Ω
Explanation
1/R=1/R1+1/R1 +1/R1+1/R1
=1/2+1/4 +1/5+1/20
=10+5+4+1/20
=20/20
=1Ω

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• 7.

### Electrical conductivity of metals is typically of the order of (in Ω-1*m-1)

• A.

107

• B.

105

• C.

10-4

• D.

10-6

A. 107
Explanation
Metals have high electrical conductivity due to the presence of free electrons that can easily move through the material. The unit of electrical conductivity is Ω-1*m-1, which represents the ease with which electric current can flow through a material. A conductivity value of 107 Ω-1*m-1 indicates a very high conductivity, meaning that metals can conduct electricity very effectively.

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• 8.

### Active Element in the circuit is one which

• A.

Dissipates Energy

• B.

• C.

• D.

Supplies energy

D. Supplies energy
Explanation
Definition :- Active elements in the circuit is one which supplies energy

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• 9.

### An electric heater draws 3.5 A from a 110 V source. The resistance of the heating elements is approximately?

• A.

31Ω

• B.

3.1Ω

• C.

385Ω

• D.

38.5Ω

A. 31Ω
Explanation
V=I*R
R=V/I
=110/3.5
=31Ω

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• 10.

### We have three resistances each of 1Ω,2Ω and 3Ω. If all the three resistances are to be connected in a circuit, how many different values of equivalent resistances are possible?

• A.

Five

• B.

Six

• C.

Seven

• D.

Eight

D. Eight
Explanation
R1=1Ω,R2=1Ω R3=1Ω
1) R1, R2, R3 in series
2)R1, R2, R3 in parallel
3)R1,in series with parallel combination R2 &R3
4)R2,in series with parallel combination R1 &R3
5)R3,in series with parallel combination R1 &R2
6)R1,in parallel with series combination R2 &R3
7)R2,in parallel with series combination R1 &R3
8)R3,in parallel with series combination R2 &R1

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• Current Version
• Apr 19, 2024
Quiz Edited by
ProProfs Editorial Team
• Apr 17, 2020
Quiz Created by
Ashish Desai

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