Physical Quantities and Units

Question 1

All physical quantities consist of a _______ and a _______.

Answer 1

All physical quantities consist of a magnitude and a unit.

Question 2

State 6 base quantities.

Answer 2

1. mass
2. length
3. time
4. electric current
5. temperature
6. amount of substance

Question 3

State 6 base units and their symbols.

Answer 3

1. kilogram; kg
2. metre; m
3. second; s
4. ampere; A
5. kelvin; K
6. mole; mol

Question 4

What is meant by a homogenous equation?

Answer 4

In a homogeneous equation, all the terms have the same base units.

Question 5

What is the symbol and the power-of-ten of the following prefixes?

Prefix	      Symbol	        Power-of-ten
tera	
giga	
mega	
kilo		
deci	
centi	
milli	
micro	
nano	
pico

Answer 5

Prefix Symbol Power-of-ten
tera T 12
giga G 9
mega M 6
kilo k 3
deci d -1
centi c -2
milli m -3
micro -6
nano n -9
pico p -12

Question 6

What is a scalar quantity?

Answer 6

A scalar quantity has magnitude only.

Question 7

What is a vector quantity?

Answer 7

A vector quantity has magnitude and direction.

Question 8

Which of the following is a vector quantity?

acceleration, speed, energy, force, distance, velocity, momentum, pressure, displacement, mass, weight

Answer 8

acceleration
force
velocity
momentum
displacement
weight