New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 Final Revision A) Complete the following: 1) Electricity is a kind of ………………... 2) Electricity moves through an ……………………… 3) Examples of conductors are …….…… , ………….. ,…………….. 4) Examples of insulators are …….…… , ………….. ,…………….. 5) Pure water is called ……………………….. 6) Impure water has ……….. dissolved in it. 7) Examples of impure water are …………………. , …………………., ………………………… 8) The strength of electricity is called ……………………. 9) The unit for measuring the strength of electricity is called ……………………... 10) Electricity in cells has a voltage of ………… or …………… 11) Appliances use …………………… which has a voltage of ……….. or ……… 1 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 12) You get an ……………………. if mains electricity passes through your body. 13) The most common cause of electric shocks is ……………………………………. 14)If the switch is ………….. the circuit is turned on, but if the switch is open, the circuit is turned ……….. 15) An open switch causes a ………………………………… 16) Two or more cells connected together are called a ……….. 17) ………….. carry electricity in cables. The voltage of electricity in these cables is ……………… of volts 18) An electric circuit has …………. parts 2 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 B) Define the following terms: 1) Conductor ………………………………………………………………………………………………… ………………………………………………………………………………………………… 2) Insulator ………………………………………………………………………………………………… ………………………………………………………………………………………………… 3) Pure substance ………………………………………………………………………………………………… ………………………………………………………………………………………………… 4) Impure substance ………………………………………………………………………………………………… ………………………………………………………………………………………………… 5) Battery ………………………………………………………………………………………………… ………………………………………………………………………………………………… 3 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 C) Explain the following statements: 1) Pure water is an electrical insulator ………………………………………………………………………………………………… ………………………………………………………………………………………………… 2) Our bodies are electrical conductors ………………………………………………………………………………………………… ………………………………………………………………………………………………… 3) Parts inside the appliance should be made of conducting material ………………………………………………………………………………………………… ………………………………………………………………………………………………… 4) Parts that we touch in an appliance should be made of insulating material ………………………………………………………………………………………………… ………………………………………………………………………………………………… 4 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 D) Mention: 1) Three harms an electric shock can cause a) ……………………………………………… b) ……………………………………………… c) ………………………………………………. 2) Three safety precautions while using electricity and reasons why we should follow them Precaution 1: ………………………………………………………………………………………………… ………………………………………………………………………………………………… Reason: ………………………………………………………………………………………………… ………………………………………………………………………………………………… Precaution 2: ………………………………………………………………………………………………… ………………………………………………………………………………………………… 5 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 Reason: ………………………………………………………………………………………………… ………………………………………………………………………………………………… Precaution 3: ………………………………………………………………………………………………… ………………………………………………………………………………………………… Reason: ………………………………………………………………………………………………… ………………………………………………………………………………………………… 6 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 F) A B 1) On the left diagram, label all the components in the electric circuit. 2) In which circuit, A or B, is the switch closed? ……….. 3) Which circuit has a break in the circuit? And why? ………………………………………………………………………………………………… ………………………………………………………………………………………………… 4) Explain why the switch should be made of a conducting material ……………………………………………………………………………………………… 7 New Discovery International School 2023/2024 – 3rd trimester final revision Science Department Year 4 G) 1) Will the lamps light up? Explain why. …………………………………………………………………………………………………. If your answer was no, what should we do so that the lamps light up? ……………………………………………………………………………………………… 2) If you remove a cell from the circuit, will the lamps glow more or less brightly ? ………………. 3) If you remove a lamp from the circuit, will the remaining lamps glow more or less brightly? …………….. 8
