Level 4

5.      Pressure pads can be used to set off burglar alarms.  The alarm is set off when someone steps on the pad.  The alarm works by sounding a buzzer or switching on a lamp or both.

The symbols for a pressure pad, a two way switch, a buzzer and a lamp are shown below.

Here are five circuit diagrams.

Look carefully at the five circuit diagrams.

Tick the correct box to show what is happening in each circuit.

 circuit diagram only the buzzer is on only the lamp is on both the buzzer and the lamp are on neither the buzzer nor the lamp is on A B C D E

5 marks

6.      It is nighttime and the desk lamp is on.  Light shines onto the key.

(a)     (i)      Draw one ray of light on the diagram to show the light shining from the lamp onto the key.  Use a ruler.
Put an arrow on the ray to show the direction of the light.

2 marks

(ii)     There is a patch of light on the wall.  This light has been reflected from the key. Draw a reflected ray of light on the diagram.
Use a ruler.

1 mark

(b)     There is a dark shadow on the table beside the mug.
Explain how this shadow is formed.

1 mark

7.      The drawing shows Amy waterskiing.

(a)     (i)      The rope is pulling Amy.  Draw an arrow on the rope to show the direction of this force.
Label the arrow A.

1 mark

(ii)     Draw an arrow to show the direction of Amy’s weight.
Label the arrow B.

1 mark

(b)     Give the names of two other forces which act on Amy or on her skis.

1.

2

2 marks

The drawing below shows the speed boat which is pulling Amy along.

(c)     The rope which pulls Amy also exerts a force on the boat.
Draw an arrow on the rope to show the direction of this force.
Label the arrow C.

1 mark

(d)     The force of the engine on the boat is increased.
What effect will this have on the speed of the boat?

1 mark

8.      Alice connects four light bulbs for her model house, as shown.  She puts the bulbs into the holes in the back wall.

(a)     When Alice turns the switch on, the bulbs do not light up.  The batteries are not flat.  None of the bulbs is broken.
Why do the bulbs not light up?

1 mark

(b)     Alice makes the circuit work.  When she turns the switch on, the bulbs are not very bright.
What must Alice add to the circuit to make the bulbs brighter?

1 mark

(c)     The four bulbs in the circuit are the same.  Which statement is correct?
Tick the correct box.

 Each bulb is the same brightness Each bulb is a different brightness The bulbs at the top are brighter The bulbs at the bottom are brighter

1 mark

The diagrams show two ways to write the model house.

circuit 1                                                       circuit 2

(d)     (i)      In circuit 1, bulb B breaks and goes out.
What happens to the other bulbs in this circuit?

1 mark

(ii)     In circuit 2, bulb C breaks and goes out.
What happens to the other bulbs in this circuit?

1 mark

(e)     In circuit 2, Alice adds another switch so that she can turn bulb A off while the other bulbs stay on.
Write the letter S on circuit 2 to show where Alice should add the switch.

1 mark