# Quantities and Units MCQ Questions & Answers

Quantities and Units MCQs : This section focuses on the "Quantities and Units". These Multiple Choice Questions (MCQs) should be practiced to improve the Quantities and Units skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

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

Question 2

A measure of the repeatability of a measurement of some quantity is

A. error
B. precision
C. accuracy
D. significant

Question 3

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

Question 4

Which of the following is expressed in engineering notation?

A. 470 × 105
B. 82 × 10–2
C. 9.1 × 10–6
D. 14.7 × 108

Question 5

Dividing 24 × 1011 by 3 × 104 equals

A. 8 × 104
B. 8 × 107
C. 8 × 1011
D. 8 × 1015

Question 6

Derived units are obtained from various combinations of

A. electrical quantities
B. fundamental units
C. metric prefixes
D. international standards

Question 7

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

Question 8

Scientific notation is a method

A. of expressing a very large number
B. of expressing a very small number
C. used to make calculations with large and small numbers
D. All of the above

Question 9

The number 14.8 can also be expressed as

A. 1.48 × 10–1
B. 1.48 × 100
C. 1.48 × 101
D. 1.48 × 102

Question 10

If you drop a 5 when rounding a number, you are using the

A. round-to-even rule
B. significant digit rule
C. round-off rule
D. retained digit rule

Question 11

Pico is what relation to micro?

A. one-tenth
B. one-hundredth
C. one-thousandth
D. one-millionth

Question 12

Another name for "fundamental units" is

A. base units
B. atoms
C. the metric system
D. letter symbols

Question 13

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

A. Nano
B. Mega
C. Kilo
D. Micro

Question 14

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

Question 15

7200 mV is the same as

A. 7.2 V
B. 7.2 V
C. 7,200,000 V
D. 0.0072 V