F2 IS QZ 09 anwers

1st Term QZ 09 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

8.1

Word Translation (10 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	閉合電路	Closed circuit
2	乾電池	Dry cell
3	導電體	Electrical conductor
4	電能	Electrical energy
5	電絕緣體	Electrical insulator
6	電力	Electricity
7	石墨	Graphite
8	金屬 / 非金屬	Metal / non-metal
9	斷路	Open circuit
10	開闢	Switch

Fill in the Blanks (9 marks)

1      A dry cell (1) stores chemical energy and is a source of electrical (1) energy of a circuit.

2     A compete circuit which allows electricity to flow through is called a closed (1) circuit.

On the contrary, an open circuit (1) does not allow electricity to flow through.

3     Materials that allow electricity to pass through are called electrical conductors (1).

Most of them are metals (1).

Materials that do not allow electricity to pass through are called electrical insulators (1). All of them are non-metals.

4     Graphite (1) is a non-metal but it allows electricity to pass through.

5     A switch (1) can be used to open or close a circuit.

Multiple Choice (3 marks)

Circle the letter of the best answer for each question.

1.       Ginny has the following set of electrical components. To build a circuit that can light up a bulb, which of the following components must be used?

(I)   A switch                 

(II) A dry cell                       

(III)        Connecting wires

A.   (I) and (II) only      

B.   (I) and (III) only    

C.   (II) and (III) only  

D.   All of the above

2.     Which of the following statements about these substances is true?

graphite

plastic

gold

iron

A.   All of them are electrical conductors.                    

B.   All of them are electrical insulators.

C.   Only gold and iron are electrical conductors.        

D.   Only plastic is an electrical insulator.

3.     Which of the following is a function of a switch?

A.   To break a circuit                                 

B.   To supply electrical energy

C.   To control the brightness of a bulb        

D.   To protect a bulb from an excessive electric current

Challenging Questions (Bonus 2 marks)

The diagram below shows a circuit switch.

Explain why part A is commonly made of plastic instead of metal.

This is because plastic is an electrical insulator (1) which does not allow electricity to flow through. This can avoid electricity flowing through it to our body / giving us an electric shock.