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PRACTICE EXAMINATION

PHYSICS

Time for examination: 40 minutes
Calculators may be needed

a) If the frequency of a note increases then

it sounds louder the pitch decreases
the pitch increases it will sound softer

b) If the amplitude of a sound wave gets smaller then

the volume will increase it will sound quieter the pitch decreases

c) A block measures 5 cm, by 5 cm, by 8 cm. It has a mass of 400g. What is the volume of the block?

200 cm³ 400 cm³ 200 g 18 cm³

d) The bending of light is called

reflection refraction dispersion transmission

e) Sound travels fastest through

a vacuum air solids liquids

(1 mark each)
2. A boy wished to investigate the sound produced when a guitar string was plucked.

For each question which follows, use one of the answers below

get louder get softer get higher get lower

a.) What would happen to the sound if the string were made tighter?

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b.) What would happen to the sound if the string were made shorter?

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c.) What would happen to the sound if the string were plucked harder?

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d.) What would happen to the sound if the box under the support was not hollow but solid?

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3. Explain why the puff of smoke given out when a gun fires can usually be seen before you hear the sound of the shot

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4. If the moon exploded tonight we would see the explosion but not hear it.

Why would we not be able to hear the moon explode?

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5. The diagram shows a periscope for looking at objects which might otherwise be out of sight.

a.) Put labels on the diagram to show which lines represent the two mirrors (1)

b.) Draw in a ray of light to indicate how we see the object (remember to put arrows on the ray so we can see which direction the light moves in) (2)

6. A boy's bedroom has a door in one wall, with a light bulb in the corridor outside.

Against the wall opposite the door is a long mirror.

The boy noticed that the light from the light bulb reflected off the mirror and made a bright patch on the wall opposite the mirror.
a.) Draw in two rays on the diagram to show where light from the light bulb will hit the mirror (2)

b.) Draw in two more rays to show where the reflected ray will hit the wall opposite the mirror (2)

7. The diagram shows a ray of light hitting a glass block

a.) Complete the diagram to show what happens to the ray as it passes through the block (2)

b.) What name do we give to the bending of light?

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1)

9. In the space below draw an electrical circuit to include a LED, Buzzer, Cell , push switch and a SPDT switch.

When the push switch is pressed either the LED or the buzzer is to come on, but not both at once.

Label each component and use its correct circuit symbol. (4)

8. A measuring cylinder is filled to the 200 cm³ mark with water (figure i)
.

A lump of material of mass 400g is lowered gently into the water. (figure ii)

a.) What is the volume of the material? . . . . . . . . . . . . . . . . . . . . . . . . . . . .(2)

b.) Calculate the density of the material.

Be sure to show all your working in the space below

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10. Study the circuit shown and answer the questions which follow.

A1 and A2 are ammeters.

The lamps P, Q and R are all similar.

a) Are the lamps P and Q wired in SERIES or PARALLEL?. . . . . . . . . . . . . . . . . . . . (1)

b) If lamp Q were unscrewed from its holder what would happen to the brightness of lamp P (answer go up, go down or not change)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1)

c) If lamp Q were unscrewed from its holder what would happen to the reading on ammeter A1 (answer go up, go down or not change)

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You can now assume lamp Q is back in place and lit up

d) How does lamp P compare in brightness to lamp R. Give a reason for your answer (answer brighter, dimmer or the same brightness)

Lamp P is . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . than lamp R.

Reason:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Ammeter A1 reads 0.3A

e) What will be the reading on ammeter A2? . . . . . . . . . . . . .. . . . .(2)

11. The diagram shows the apparatus used by boy to pull a block of wood along a bench with a spring.

There is a 1kg mass resting on the block.

The spring has an unstretched length of 5cm but becomes 15 cm when the block is being pulled along.

a.) What is the name of the force which is slowing the block down, causing the spring to stretch?

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1)

b.) Mark an arrow on the diagram to show the direction of this force. (1)

c.) What changes do you think the boy would have noticed if he repeated the experiment using a heavier weight on the block of wood:

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The boy decided to repeat the experiment but this time joined two springs end to end (in series). He kept all other aspects of the investigation the same.

e.) What is the total length of the new spring while he is pulling along the block?

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d.) What changes do you think the boy would have noticed if he repeated the experiment but this time put rollers under the block (explain the answer):

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f.) What instrument could the boy have used to measure the force required to pull the block along the bench?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(1)

12. The American Apollo Space Programme sent manned satellites to the Moon and back.

The fuel for the rocket consists of hydrogen and oxygen

The distance from the Earth to the moon is, on average, 384 000 km.

After launch, the satellite spends a few hours in orbit around the Earth.

a. What force causes the satellite to remain in orbit around the Earth?

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b. What form of energy does the rocket have:

i while waiting to take off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1)

ii while on its way to the moon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1)

The mass of the astronaut, with all his equipment, is about 100kg.

The pull of the Earth’s gravity is about 10N/kg

c. What is the weight of the astronaut while standing on the Earth?

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d. When the astronaut gets to the moon will his weight be less than on Earth, the same as on Earth or zero?

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The surface of the moon was first thought to be soft and powdery to a depth of many cm.

e. The boots that were used on the surface of the moon were very big, with large soles.

Why do you think they were designed like this?

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(Total 60 marks)