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American Academy Larnaca

Year 4 TestDouble Science

Physics

Topic P1a.9: Producing and measuring electricity

Date:

Time: 20 minutes

FORMULAE

You may find the following formulae useful.

ampsinusedcurrent

hour-ampinratingbatteryorcapacityhoursinTime =

t

QI

Time

ChargeCurrent ==

Q

EV

Charge

EnergyVoltage ==

I

VR

itthroughgoingCurrent

itacrossVoltageResistance ==

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Light-dependent resistor (LDR) experiment

Jane uses this apparatus to find out how the resistance of an LDR varies. She notes the resistance of

the LDR when it is at different distances from the lamp.

The graph of her results looks like this.

v

1. When Jane moves the lamp from 10 cm to 30 cm, the resistance of the LDR increases by

A 800 ohms

B 1400 ohms

C 2200 ohms

D 2400 ohms

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2. Which circuit should Jane use to measure the resistance of the LDR?

3. Jane repeated the experiment using a lamp which was less bright.

Which of these shows her new graph?

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4. Janes teacher sets up another LDR experiment.

This time she uses a data logger to measure the resistance and a computer with a monitor to

display the graph.

Which of these is not a reason for using the data logger in this experiment?

A Data loggers are very expensive

B The data logger can take measurements overnight

C The data logger always measures correctly

D People can make mistakes when reading instruments

Old computers

Peter has decided to replace his old computer.

Peter had bought a new computer every 10 years.

The graph shows the changes in processing speed of his old computers.

5. During the period shown the processing speed of Peters computers was

A proportional to their ages

B proportional to the date

C doubling every 10 years

D doubling every 20 years

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6. Peter uses the graph to make a statement about the processing speed ofall computers.

The statement cannot be valid because

A valid graphs must have straight lines

B he did not have a control experiment

C his computers were out of date

D there was not enough data

7. Which of these statements and explanations is correct for electronic processors?

8. Peter uses his computer to collect and display data from some experiments about plant

growth.

Which of these is the best reason for Peter to use the computer?

A It processes information very quickly

B It displays the data as a graph

C It takes regular measurements over a long time

D It is linked to the internet

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Ohms law

In 1827, Georg Ohm published the results of some experiments. He had investigated the current in a

conductor and the voltage across it. His conclusion was V= I R.

9. Which of these shows his conclusion?

10. He let scientists in other parts of the world know of his discovery.

Which of these methods would he have used in 1827?

A the radio

B a telephone

C the internet

D a letter

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11. The table shows some of the readings on the ammeter and voltmeter in an experiment to

demonstrate Ohms law.

There is something wrong with one of the meters.

Four people suggest what is wrong.

Who is correct?

A Alice

B Bill

C Craig

D Dora

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Maglev trains

12. Superconductivity helped in the development of Maglev trains because it allowed the

creation of

A large magnetic fields with small heat loss

B large magnetic fields with large heat loss

C small magnetic fields with small heat loss

D small magnetic fields with large heat loss

13. Which of these would reduce the cost of running a Maglev train?

A developing tracks with less friction

B increasing the number of people who travel by train

C developing materials which are superconducting at temperatures lower than

is now possible

D developing materials which are superconducting at temperatures higher than

is now possible

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14. Which of these represents superconductivity?

15. Which of these could show the current from a battery?

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Electric current

Jason and his friends are investigating electric current.

They discuss electric current.

Only three make correct statements.

16. Who is not correct?

A Jason

B Katie

C Nathan

D Stephanie

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Generating electricity

Use this information about bicycle dynamos to answer questions 17 to 22.

17. Which row of the table is correct for X and Y in the dynamo?

18. The graph shows the output voltage of the dynamo as the friction wheel is turned steadily.

The maximum output voltage of this dynamo is about

A 0.08 V

B 1.3 V

C 1.6 V

D 2.6 V

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19. Which row of the table is correct for the current in the lamp?

20. The diagram of a bicycle dynamo on page 11 shows a friction wheel.

Which row of the table is correct if the friction wheel turns faster?

Investigating resistors

Jo and her science group set up this circuit to find the resistances of a light-dependent resistor

(LDR), a thermistor and a filament lamp.

21. Which row of the table is correct for meters X and Y?

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22. Jos group use an LDR in the circuit.

They find the resistance as they change the brightness of the light shining on the LDR.

Which row of the table is correct when the LDR is in the dark?

23. Jos group uses the thermistor in the circuit and finds its resistance at different temperatures.

They discuss the experiment.

Who has made an evaluation of the investigation?

A Jo

B Kim

C Lyn

D Malcolm

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24. A fully charged battery runs down in 4 hours.

It supplies an average current of 0.5 A.

The capacity of the battery is

A 0.5 amps

B 2 amp-hours

C 4 hours

D 8 amp-hours

TOTAL FOR MULTIPLE CHOICE PAPER: 24 MARKS

END