SI Units and Prefixes: Master the Basics of Measurement

Question 1

Convert the value of 5 kilometers to meters:

Accepted Answer

5000

Answer

500

Answer

50

Answer

5

Question 2

Which symbol correctly represents the micro prefix?

Accepted Answer

μ

Answer

m

Answer

u

Answer

nM

Question 3

Identify the SI unit of length.

Accepted Answer

Meter

Answer

Kilogram

Answer

Second

Answer

Ampere

Question 4

Select the SI unit for mass.

Accepted Answer

Kilogram

Answer

Newton

Answer

Meter

Answer

Second

Question 5

Which of the following is NOT a SI base unit?

Accepted Answer

Degree Celsius

Answer

Meter

Answer

Second

Answer

Newton

Question 6

The prefix 'kilo-' denotes a multiple of:

Accepted Answer

10^3

Answer

10^-3

Answer

10^-2

Answer

10^6

Question 7

The SI unit of mass is the:

Accepted Answer

Kilogram

Answer

Gram

Answer

Tonne

Answer

Pound

Question 8

Which prefix represents a submultiple of 10^-9?

Accepted Answer

nano-

Answer

milli-

Answer

micro-

Answer

deci-

Question 9

Which of the following is the correct SI unit for electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Ohm

Answer

Coulomb

Question 10

The SI unit of temperature is:

Accepted Answer

Kelvin

Answer

Degree Celsius

Answer

Rankine

Answer

Fahrenheit

Question 11

The prefix 'mega-' represents a multiple of:

Accepted Answer

10^6

Answer

10^-6

Answer

10^-3

Answer

10^3

Question 12

Which of the following is the SI unit of length?

Accepted Answer

Meter

Answer

Centimeter

Answer

Kilometer

Answer

Yard

Question 13

Which of the following is NOT a base quantity in the SI system?

Accepted Answer

Voltage

Answer

Mass

Answer

Time

Answer

Length

Question 14

Which of the following is a valid conversion factor for converting kilometers to meters?

Accepted Answer

1000

Answer

0.001

Answer

100

Answer

0.1

Question 15

Which SI prefix represents a thousand?

Accepted Answer

kilo-

Answer

mega-

Answer

giga-

Answer

tera-

Question 16

What is the correct symbol for the SI unit of time?

Accepted Answer

s

Answer

t

Answer

h

Answer

min

Question 17

Which of the following is the SI unit of electric current?

Accepted Answer

Ampere

Answer

Volt

Answer

Coulomb

Answer

Ohm

Question 18

Which of the following is a derived unit in the SI system?

Accepted Answer

Joule

Answer

Meter

Answer

Kilogram

Answer

Second

Question 19

Which of the following is not a base unit in the International System of Units (SI)?

Accepted Answer

Newton

Answer

Meter

Answer

Second

Answer

Ampere

Question 20

What is the SI prefix for a multiple of 10^12?

Accepted Answer

Tera

Answer

Giga

Answer

Mega

Answer

Kilo

Question 21

Which of the following quantities can be expressed in newtons?

Accepted Answer

Force

Answer

Energy

Answer

Power

Answer

Mass

Question 22

What is the correct SI unit for electrical potential difference?

Accepted Answer

Volt

Answer

Coulomb

Answer

Ampere

Answer

Ohm

Question 23

What is the correct abbreviation for the SI unit of luminous intensity?

Accepted Answer

Cd

Answer

lm

Answer

lx

Answer

W

Question 24

Which of the following prefixes represents a multiple of 10^-3?

Accepted Answer

Milli

Answer

Kilo

Answer

Mega

Answer

Micro

Question 25

What is the SI base unit for time?

Accepted Answer

Second

Answer

Meter

Answer

Kilogram

Answer

Kelvin

Question 26

Which of the following is the SI base unit of length?

Accepted Answer

Meter (m)

Answer

Kelvin (K)

Answer

Second (s)

Answer

Kilogram (kg)

Question 27

What is the SI prefix for 10^-9?

Accepted Answer

Nano (n)

Answer

Mega (M)

Answer

Giga (G)

Answer

Tera (T)

Question 28

Which of the following units is derived from the base units of mass, length, and time?

Accepted Answer

Newton (N)

Answer

Joule (J)

Answer

Ampere (A)

Answer

Candela (cd)

Question 29

Which of the following is the fundamental quantity represented by the candela?

Accepted Answer

Luminous intensity

Answer

Temperature

Answer

Length

Answer

Time

Question 30

The SI prefix 'giga' represents a factor of:

Accepted Answer

10^9

Answer

10^3

Answer

10^6

Answer

10^12

Question 31

Which of the following units measures electrical current?

Accepted Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Answer

Coulomb (C)

Question 32

The base unit of time is defined based on the resonant frequency of which atom?

Accepted Answer

Cesium atom

Answer

Rubidium atom

Answer

Hydrogen atom

Answer

Oxygen atom

Question 33

Convert 250 nanoseconds to seconds using scientific notation.

Accepted Answer

2.5 × 10^-7 s

Answer

2.5 × 10^-6 s

Answer

2.5 × 10^-5 s

Answer

2.5 × 10^-4 s

Question 34

What is the primary responsibility of the International Bureau of Weights and Measures (BIPM) regarding the International System of Units (SI)?

Accepted Answer

Ensuring the global consistency of measurement standards

Answer

Establishing new SI units and prefixes

Answer

Encouraging the adoption of SI units in science and industry

Question 35

Which of the following is NOT a fundamental unit in the SI system?

Accepted Answer

Newton

Answer

Meter

Answer

Kilogram

Answer

Second

Question 36

Which of the following is considered a base SI unit?

Accepted Answer

Meter

Answer

Volt

Answer

Joule

Question 37

Which physical quantity is measured in newtons?

Accepted Answer

Force

Answer

Current

Answer

Energy

Answer

Power

Question 38

What is the SI unit for measuring electrical current?

Accepted Answer

Ampere

Answer

Ohm

Answer

Volt

Answer

Coulomb

Question 39

What is the SI unit for measuring energy?

Accepted Answer

Joule

Answer

Watt

Answer

Volt

Answer

Newton

Question 40

What is the SI unit for measuring time?

Accepted Answer

Second

Answer

Hour

Answer

Minute

Answer

Day

Question 41

What is the SI unit for measuring temperature?

Accepted Answer

Kelvin

Answer

Celsius

Answer

Fahrenheit

Question 42

The SI unit of length is known as the:

Accepted Answer

Meter

Answer

Inch

Answer

Centimeter

Answer

Kilometer

Question 43

Which prefix represents a factor of one thousandth?

Accepted Answer

Milli

Answer

Mega

Answer

Kilo

Answer

Centi

Question 44

The symbol 'µ' represents the prefix:

Accepted Answer

Micro

Answer

Nano

Answer

Mega

Answer

Milli

Question 45

Which of the following units is NOT a base SI unit?

Accepted Answer

Volt

Answer

Meter

Answer

Kilogram

Answer

Second

Question 46

The SI unit of time is the:

Accepted Answer

Second

Answer

Minute

Answer

Hour

Answer

Day

Question 47

Convert 1800 milliliters to liters:

Accepted Answer

1.8

Answer

18

Answer

0.018

Answer

0.18

Question 48

Which of the following is NOT a base SI unit?

Accepted Answer

Gram

Answer

Meter

Answer

Second

Answer

Kilogram

Question 49

The prefix 'kilo' represents a multiplication factor of:

Accepted Answer

10^3

Answer

10^6

Answer

10^-3

Question 50

What is 0.000025 meters expressed in scientific notation with an appropriate SI prefix?

Accepted Answer

2.5 x 10^-5 m

Answer

25 x 10^-6 m

Answer

2.5 x 10^-6 m

Answer

25 x 10^-4 m

Question 51

Which SI unit is used to express the amount of substance?

Accepted Answer

Mole

Answer

Candela

Answer

Kelvin

Answer

Ampere

Question 52

A measurement of 1000 milligrams (mg) is equivalent to:

Accepted Answer

1 gram (g)

Answer

0.1 grams (g)

Answer

10 grams (g)

Answer

100 grams (g)

Question 53

The SI unit for electric current is the:

Accepted Answer

Ampere

Answer

Watt

Answer

Ohm

Answer

Volt

Question 54

The prefix 'micro' represents which order of magnitude?

Accepted Answer

10^-6

Answer

10^6

Answer

10^-9

Answer

10^-3

Question 55

What is the SI unit for luminous intensity?

Accepted Answer

Candela

Answer

Lux

Answer

Lumen

Answer

Watt

Question 56

Convert 2.7 gigameters (Gm) to meters (m).

Accepted Answer

2.7 x 10^9 m

Answer

2.7 x 10^6 m

Answer

2.7 x 10^3 m

Answer

2.7 x 10^12 m

Question 57

Why is the International System of Units (SI) important in science?

Accepted Answer

It provides a standardized system for communication and collaboration among scientists worldwide.

Answer

It is based on the imperial system, making it easy to understand.

Answer

It only uses base units, simplifying calculations.