Chapter 1.1 - Physicsl Quantities R1

Question 1

Express the base units of resistance.

Answer 1

kg m² s^-3 A^-2

Question 2

State all 6 SI base unit symbols on the CCEA specification.

Answer 2

kg

s

m

K

A

mol

Question 3

What are the base units for volume?

Answer 3

m³

Question 4

Express the base units for pressure.

Answer 4

kg m^-1 s^-2

Question 5

State the SI unit of resistance.

Answer 5

Ohm / Ω

Question 6

What 2 things do all physical quantities consist of?

Answer 6

Numerical magnitude and unit.

Question 7

What does the prefix p represent and what is its multiplying factor?

Answer 7

This prefix is pico 10^-12

Question 8

State the SI symbol for length.

Answer 8

m

Question 9

What does the prefix m represent and what is its multiplying factor?

Answer 9

This prefix is milli 10^-3

Question 10

Express the base units for force.

Answer 10

kg m s^-2

Question 11

Name the 6 base units on the CCEA specification.

BONUS - Name the base unit not on the specification.

Answer 11

Mass. Length. Time. Current. Temperature. Amount of substance.

Bonus - Luminious intensity.

Question 12

Some SI symbols are small caps, eg m and s. Some are large caps, eg K and A. What is the reason for this?

Answer 12

Those in large caps, eg N, K & A are named after someone (Newton, Lord Kelvin, Andre-Marie Ampere).

Question 13

What physical quantity is being measured in the information below for a machine?

876 kJ ms^-1

Answer 13

Power (remember power = Energy / Time).

Question 14

Express the base units for momentum.

Answer 14

kg m s^-1

Question 15

Express the following energy in mJ.

Express you answer in standard form.

4.82 x 10^-7 MJ

Answer 15

4.82 x 10² mJ

Question 16

Express the following voltage in kV.

7.34 x 10⁵ V

Answer 16

7.34 x 10² kV

Question 17

The list below gives you a number of physical quantities and units. Which are base quantities or base units?

Coulomb.

Force.

Length.

Mole

Newton.

Temperature.

Answer 17

Length

Mole

Temperature.

Question 18

State the SI symbol for temperature.

Answer 18

K

Question 19

Express the base units for Hz.

Answer 19

s^-1

Question 20

What does the prefix μ represent and what is its multiplying factor?

Answer 20

This prefix is micro 10^-6

Question 21

What does the prefix T represent and what is its multiplying factor?

Answer 21

This prefix is Tera 10¹²

Question 22

Express the base units for a moment.

Answer 22

kg m² s^-2

Question 23

What are base units?

Answer 23

A unit from which all other units are derived.

Question 24

State the SI symbol for current.

Answer 24

A

Question 25

State the SI symbol for mass.

Answer 25

kg

Question 26

State the SI symbol for time.

Answer 26

s

Question 27

The following information below outlines the power of a machine.

33.8 MJ μs^-1

Use you knowledge of prefixes to express this answer in W.

Answer 27

33.8 x 10¹² W

or 3.38 x 10¹³ W in standard form.

( Mega / micro is 10⁶ / 10^-6 = 10¹²)

Question 28

What does the prefix M represent and what is its multiplying factor?

Answer 28

This prefix is mega 10⁶

Question 29

Express the base units for energy.

Answer 29

kg m² s^-2

Question 30

What are the base units for density?

Answer 30

kgm^-3

Question 31

Express the base units for charge.

Answer 31

A s

Question 32

What does the prefix G represent and what is its multiplying factor?

Answer 32

This prefix is Gega 10⁹

Question 33

Express the base units for the volt.

Answer 33

kg m² s^-3 A^-1

Question 34

What does the prefix n represent and what is its multiplying factor?

Answer 34

This prefix is nano 10^-9

Question 35

Express the base units for power.

Answer 35

kg m² s^-3

Question 36

State the SI symbol for amount of substance.

Answer 36

mol

Question 37

What is meant by a derived unit?

Answer 37

Unit made up from (combination of 2 or more) base units.

Question 38

What does the prefix k represent and what is its multiplying factor?

Answer 38

This prefix is kilo 10³

Question 39

What does the prefix c represent and what is its multiplying factor?

Answer 39

This prefix is centi 10^-2