Physics 1

Question 1

D. Density

Answer 1

Mass per unit volume of a substance

Question 2

How do you make sure when measuring the volume of an irregular object you don’t displace more than the volume of the object ?

Answer 2

Use string

Question 3

What equipment is used for finding the mass of an object ?

Answer 3

Mass balance / balance

Question 4

How do you change units from metres cubed to centimetres cubed ?

Answer 4

x 1,000,000

Question 5

What is potential difference ?

Answer 5

A measure of how much energy is transferred between two points in a circuit
Amount of energy required to move an electric charge from one point to another

Question 6

What is the role of the fuse ?

Answer 6

• connected to the live wire

- if too much current flows, it will melt and break the circuit

Question 7

What is a short circuit ?

Answer 7

Low resistance connection between two conductors causing an excessive current to flow

Question 8

What frequency and potential difference does mains electricity operate at ?

Answer 8

• 230 Volts

- 50 Hertz

Question 9

Longest pin in a plug ?

Answer 9

The earth wire

Question 10

Colour of the live wire

Answer 10

Brown

Question 11

Why are the three cables in a plug insulated ?

Answer 11

To stop the wires touching each other

Question 12

Colour of the earth wire ?

Answer 12

Yellow and Green

Question 13

Current

Answer 13

Rate of flow of charge

Question 14

Good Conductor ?

Answer 14

Cu - copper