1.1

Question 1

SI unit of mass

Answer 1

Kilo (kg)

Question 2

SI unit of length

Answer 2

Meter (m)

Question 3

SI unit of time

Answer 3

Second (s)

Question 4

SI unit of current

Answer 4

Ampere (A)

Question 5

SI unit of temperature

Answer 5

Kelvin (K)

Question 6

SI unit of amount of substance

Answer 6

Mole (mol)

Question 7

What are derived units?

Answer 7

The base units of physical quantities
E.g. Newtons, Joules, Pascals

Question 8

Give Newtons in SI base units

Answer 8

Force = mass x acceleration
N=kg x ms^-2=kg m^2 s^-2
Therefore, the Newton (N) in SI base units is kg m s^-2

Question 9

Give Joules in SI base units

Answer 9

Energy=1/2x mass x velocity2
J=kg x (ms^-1)^2=kgm^2 s^-2
Therefore, the Joule (J) in Sl base units is kg m^2 s^-2

Question 10

Name each power of 10 prefix and abbreviation from n^-15 to n^15

Answer 10

peta P 10^15
tera T 10^12
giga G 10^9
mega M 10 ^6
kilo k 10^3
milli m 10^-3
micro u 10^-6
nano n 10^-9
pico p 10^-12
femto f 10^15

Question 11

How to convert J to eV

Answer 11

1 eV = 1.6 x 10^-19 J