Explore topic-wise MCQs in Electronics.

This section includes 60 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following metric prefixes could replace 10?

A. Nano
B. Mega
C. Kilo
D. Micro
Answer» B. Mega
Discussion
2.

Dividing 24 × 10 by 3 × 10 equals

A. 8 × 10
B. 8 × 10
C. 8 × 10
D. 8 × 10
Answer» C. 8 × 10
Discussion
3.

Adding 27.5 × 10 to 8.9 × 10 equals

A. 36.4 × 10
B. 116.5 × 10
C. 28.39 × 10
D. 1.165 × 10
Answer» E.
Discussion
4.

Add 21 mA and 8000 A and express the result in milliamperes.

A. 21.8 mA
B. 218 mA
C. 29 mA
D. 290 mA
Answer» D. 290 mA
Discussion
5.

(12.6 × 10)(10.5 × 10) = ________.

A. 13.2 × 10
B. 1.32 × 10
C. 1.32 × 10
D. 13.2 × 10
Answer» D. 13.2 × 10
Discussion
6.

0.00015 V can be expressed in powers of ten as 1.5 × 10 V.

A. True
B. False
Answer» B. False
Discussion
7.

Multiplying 5 × 10 by 4 × 10 results in 20 × 10.

A. True
B. False
Answer» C.
Discussion
8.

The metric prefix is used to represent one billion.

A. True
B. False
Answer» B. False
Discussion
9.

Subtracting 18 × 10 from 480 × 10 results in 30 × 10.

A. True
B. False
Answer» B. False
Discussion
10.

7450 × 10 amperes equals 74.5 ___.

A. A
B. mA
C. A
D. nA
Answer» C. A
Discussion
11.

The number 5200 ×10 equals ___ × 10.

A. 0.52
B. 5.2
C. 52
D. 520
Answer» C. 52
Discussion
12.

1300 × 10 F is the same as 1300 ___.

A. mF
B. F
C. nF
D. pF
Answer» E.
Discussion
13.

Which of the following metric prefixes could replace 10–9?

A. Nano
B. Mega
C. Kilo
D. Micro
Answer» B. Mega
Discussion
14.

Adding 27.5 × 103 to 8.9 × 104 equals

A. 36.4 × 107
B. 116.5 × 104
C. 28.39 × 103
D. 1.165 × 105
Answer» E.
Discussion
15.

Dividing 24 × 1011 by 3 × 104 equals

A. 8 × 104
B. 8 × 107
C. 8 × 1011
D. 8 × 1015
Answer» C. 8 × 1011
Discussion
16.

(12.6 × 106)(10.5 × 103) = ________.

A. 13.2 × 1012
B. 1.32 × 1012
C. 1.32 × 1011
D. 13.2 × 1011
Answer» D. 13.2 × 1011
Discussion
17.

7450 × 10–5 amperes equals 74.5 ___.

A. A
B. mA
C. A
D. nA
Answer» C. A
Discussion
18.

The number 5200 ×10–2 equals ___ × 101.

A. 0.52
B. 5.2
C. 52
D. 520
Answer» C. 52
Discussion
19.

1300 × 10–12 F is the same as 1300 ___.

A. mF
B. F
C. nF
D. pF
Answer» E.
Discussion
20.

The number 0.0136 equals 13.6 × ___.

A. 10–1
B. 10–2
C. 10–3
D. 10–4
Answer» D. 10–4
Discussion
21.

0.00015 V can be expressed in powers of ten as 1.5 × 10–4 V.

A. True
B. False
Answer» B. False
Discussion
22.

Multiplying 5 × 106 by 4 × 103 results in 20 × 1018.

A. True
B. False
Answer» C.
Discussion
23.

Subtracting 18 × 102 from 480 × 101 results in 30 × 102.

A. True
B. False
Answer» B. False
Discussion
24.

What is (79 × 106)/(12 × 10–8)?

A. 6,580 × 1012
B. 658 × 1010
C. 6.58 × 1014
D. 0.658 × 1016
Answer» D. 0.658 × 1016
Discussion
25.

1300 × 10–12 F is the same as 1300 ___.

A. mF
B. F
C. nF
D. pF
Answer» E.
Discussion
26.

Multiplying 5 √ó 106 by 4 √ó 103 results in 20 √ó 1018.

A. 1
B.
Answer» C.
Discussion
27.

Precision refers to the difference between the measured value and the accepted value.

A. 1
B.
Answer» C.
Discussion
28.

The number 0.0136 equals 13.6 √ó ___.

A. 10–1
B. 10–2
C. 10–3
D. 10–4
Answer» D. 10‚Äì4
Discussion
29.

4200 W is the same as 4.2 kW.

A. 1
B.
Answer» B.
Discussion
30.

The metric prefix giga is used to represent one billion.

A. 1
B.
Answer» B.
Discussion
31.

Another name for "fundamental units" is

A. base units
B. atoms
C. the metric system
D. letter symbols
Answer» B. atoms
Discussion
32.

Add 21 mA and 8000 A and express the result in milliamperes.

A. 21.8 mA
B. 218 mA
C. 29 mA
D. 290 mA
Answer» D. 290 mA
Discussion
33.

Only electrical quantities have symbols associated with them.

A. 1
B.
Answer» C.
Discussion
34.

Which of the following is expressed in engineering notation?

A. 470 √ó 105
B. 82 × 10–2
C. 9.1 × 10–6
D. 14.7 √ó 108
Answer» D. 14.7 √ó 108
Discussion
35.

The number 5200 ×10–2 equals ___ × 101.

A. 0.52
B. 5.2
C. 52
D. 520
Answer» C. 52
Discussion
36.

Subtracting 18 √ó 102 from 480 √ó 101 results in 30 √ó 102.

A. 1
B.
Answer» B.
Discussion
37.

Pico is what relation to micro?

A. one-tenth
B. one-hundredth
C. one-thousandth
D. one-millionth
Answer» E.
Discussion
38.

(12.6 √ó 106)(10.5 √ó 103) = ________.

A. 13.2 √ó 1012
B. 1.32 √ó 1012
C. 1.32 √ó 1011
D. 13.2 √ó 1011
Answer» D. 13.2 √ó 1011
Discussion
39.

106,100,000 Hz is the same as ___ MHz.

A. 106.1
B. 1061
C. 10610
D. 106100
Answer» B. 1061
Discussion
40.

The joule is the unit for ___.

A. energy
B. charge
C. time
D. frequency
Answer» B. charge
Discussion
41.

The coulomb is the unit for charge.

A. 1
B.
Answer» B.
Discussion
42.

The unit for frequency is the

A. hertz
B. ampere
C. watt
D. second
Answer» B. ampere
Discussion
43.

The number 24.5, rounded to two significant digits, is 25.

A. 1
B.
Answer» C.
Discussion
44.

The difference between scientific and engineering notation is

A. powers of ten representation
B. single vs. multiple digits before decimal point
C. groupings of multiples of three digits
D. All of the above
Answer» E.
Discussion
45.

The digits in a measured number that are known to be correct are called

A. accuracy digits
B. significant digits
C. error digits
D. precision digits
Answer» C. error digits
Discussion
46.

Voltage, not current, determines the severity of an electrical shock.

A. 1
B.
Answer» C.
Discussion
47.

When using the terms "accuracy" and "precision" for measurements

A. "precision" implies less measurement error than "accuracy"
B. "accuracy" implies less measurement error than "precision"
C. "precision" measures the repeatability of a measurement
D. both terms mean the same thing
Answer» D. both terms mean the same thing
Discussion
48.

Adding 27.5 √ó 103 to 8.9 √ó 104 equals

A. 36.4 √ó 107
B. 116.5 √ó 104
C. 28.39 √ó 103
D. 1.165 √ó 105
Answer» E.
Discussion
49.

The ___ is the unit for resistance, reactance, and impedance.

A. farad
B. henry
C. ohm
D. watt
Answer» D. watt
Discussion
50.

0.00015 V can be expressed in powers of ten as 1.5 × 10–4 V.

A. 1
B.
C. 1
D.
Answer» B.
Discussion