8/19/2019 quizz 8j

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Exploring Science edition © Pearson Education Limited 2008272

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Quick Quiz

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1 The air resistance of a car can be reduced by:

A making the car bigger.

B making the car heavier.

C giving it a streamlined shape.

D putting a roof rack on it.

2 Which statement about air resistance is true?

A If speed increases, air resistance decreases.

B If speed increases, air resistance increases.C  If speed decreases, air resistance increases.

D Speed has no effect on air resistance.

3  A car needs a forwards force to keep moving

because:

A everything needs a force to keep moving.

B gravity is trying to slow it down.

C  it needs a force to balance friction and air

resistance.

D weight balances friction.

4 Air resistance on a moving object is caused

by:

A air being attracted to the object.

B air particles moving around the object.

C the wind.

D air particles hitting the object.

8Jb

1  If the same force is acting on an area which

of these statements is true?

A The size of the area does not matter.

B The bigger the area, the bigger the

pressure.

C The smaller the area, the smaller the

pressure.

D The smaller the area, the bigger thepressure.

2  If all these birds are the same weight, whichbird has the lowest pressure under its feet?

A crow B seagull

C raven D chicken

3 Why is it easier to cut something with a sharp

knife than with a blunt one?

A The area of the knife edge is large, so

pressure is greater.

B The area of the knife edge is small, so

pressure is greater.

C The area of the knife edge is large, so

pressure is smaller.

D The area of the knife edge is small, sopressure is smaller.

4 Why do trains need to run on tracks?

A So they can pull more coaches.

B To make them easier to steer.

C To reduce the pressure beneath the train.

D To increase the pressure beneath the train.

8Jc

1 Which statement is not true?

A A south pole repels a north pole.

B A south pole repels a south pole.

C A north pole attracts a south pole.

D A north pole repels a north pole.

2 Which pair of materials are both magnetic

materials?

A silver and gold B iron and plasticC copper and steel D iron and steel

On your answer sheet, write in the correct letter for each question.

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Exploring Science edition © Pearson Education Limited 2008273

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Quick Quiz (continued)

3 Which of these changes will make an

electromagnet stronger?

A Use more coils of wire.

B Use a smaller current.

C Use a wooden core.

D Use fewer coils of wire.

4 Which of things is not a reason why

electromagnet are used?

A They can be switched off.

B They are more expensive.

C Their strength can be controlled.

D They can be very strong.

8Jd

1 A magnetic field is:

A a piece of ground with lots of iron in it.

B the space around a magnet where it

attracts magnetic materials.

C the space around a magnet where it

attracts all metals.D the space around a magnet where it repels

magnetic materials.

2 Which diagram shows the shape of the

magnetic field of a bar magnet?

A  B 

C  D 

3 The direction of a magnetic field is from:

A the south pole to the north pole.

B the north pole to the south pole.

C the west pole to the east pole.

D the east pole to the west pole.

4 The Earth’s north magnetic pole is:

A near the North pole. B near the South

pole.

  D at the South pole.

8Je

1  In science, a lever is:

A a device that keeps the size of force you

put in the same.

B a device that changes the size of force you

put in.

C a device that changes the area of force you

put in.

D someone about to finish school.

2  Which are the correct labels for the levershown below?

A X = effort, Y = pivot, Z = load

B X = pivot, Y = effort, Z = load

C X = load, Y = pivot, Z = effort

D X = load, Y = effort, Z = pivot

3 Which lever will make it easiest to move the

rock?

4 How many diagrams show levers in action?

A 1

B 2

C 3

D 4

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A B

C D

X Y Z

C at the North pole.