KS4 / P1a.09 Producing and measuring electricity test 10_ 11 MCA answers

8/7/2019 KS4 / P1a.09 Producing and measuring electricity test 10_ 11 MCA answers

1/14

Test A

Test A 1

Surname Name

Signature

American Academy LarnacaYear 4 Science

Test P1a.9

Foundation and Higher Tier

MULTIPLE CHOICE ANSWER SHEETTime: 20 minutes

Please check that all the details printed above are correct and sign in the box above.

1. No amendments may be made to the pre-printed information on this form.2. Shade the bubble next to the correct tier of entry: Foundation or Higher.

3. If you are doing foundation ties, please answer questions 1 24.

4. If you are doing foundation ties, please answer questions 17 40.5. Check that you are marking the answer for the correct question number.

6. If more than one answer per question is marked, no mark will be given.

________________________________________________________________________________

Mark bubbles like thisUse an HB pencil and

rub out any errors

thoroughly.

Q. 1 24 Foundation tier

Q Answer

1 A B C D

2 A B C D

3 A B C D

4 A B C D

5 A B C D

6 A B C D

7 A B C D

8 A B C D

9 A B C D

10 A B C D

11 A B C D

12 A B C D

13 A B C D

14 A B C D

15 A B C D

16 A B C D

Q. 17 40 Higher tier

Q Answer

25 A B C D

26 A B C D

27 A B C D

28 A B C D

29 A B C D

30 A B C D

31 A B C D

32 A B C D

33 A B C D

34 A B C D

35 A B C D

36 A B C D

37 A B C D

38 A B C D

39 A B C D

40 A B C D

Q Answer

17 A B C D

18 A B C D

19 A B C D

20 A B C D

21 A B C D

22 A B C D

23 A B C D

24 A B C D


2/14

Test A

Test A 2


3/14

Test A

Test A 3

Surname Initial(s)

Signature

American Academy Larnaca

Year 4 TestSingle Science

Physics

Topic P1a.9: Producing and measuring

electricity

Wednesday 23 February 2011

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 ==


4/14

Test A

Test A 4

17. The current from a solar cell is

A static

B alternating

C solar

D direct

18. Which of these have a different resistance in the dark and the light?

A thermistor

B switches

C fixed resistors

D light dependent resistors

The students find this picture of a solar powered car

19. In the car, electrical energy from solar cells is stored

A In a generator

B In disposable batteries

C In a permanent magnet

D In rechargeable batteries

Use this information to answer questions 20-23.

Asif bought a wind-up radio.

When the handle on the radio is turned, energy is stored in a spring.

As the spring unwinds it drives a generator.


5/14

Test A

Test A 5

20. The generator produces an electric current when

A A magnet rotates in a coil of wire

B A magnet rotates near an insulator

C A magnet rotates near a mains socket

D A magnet rotates in a vacuum

21. The graph shows the current in part of the radio.

Which word best describes the current?

A alternating

B direct

C stationary

D neutral

22. Asifs old radio uses dry cell.Each dry cell has an output voltage of 1.5V

Which of these shows how the cells should be connected to give an output voltage of 6V?


6/14

Test A

Test A 6

Ben is given a battery powered train for his birthday

23. This graph shows how the current changes while the battery is discharging

The capacity of the battery, in ampere-hours, is about

A 2

B 3

C 6

D 18

Jane and Kim are investigating how the current in a fixed resistor varies with voltage

24. Which circuits should they use?

Q = It= 6.0A x 3.0h

= 18Ah


7/14

Test A

Test A 7

25. Jane and Kim plot a graph of their results.

A 0.1 B 6.4

C 8.0

D 10

26. Which of these is a correct conclusion from the graph?

A Resistance increases as current increases

BResistance is constant as current increases

C Resistance decreases as current increases

D Resistance varies as current increases

R = V / I

= 8V / 0.8A= 10


8/14

Test A

Test A 8

27. Jane and Kim repeat their investigation. The new resistor has a higher resistance.

Here is their first graph again.


9/14

Test A

Test A 9

Investigating thermistors

Rachel and Zoe are investigating a thermistor.

They produce this graph for a thermistor.

28. To make the resistance of the thermistor decrease from 15 k to 6k the temperature must

A Increase by 35oC

B Decrease by 20oC

C Decrease by 35oC

D Increase by 20oC

29. Rachel measures the resistance of the thermistor at different temperatures.

She takes each measurement 3 times.

What should Rachel do with each set of 3 measurements?

A Choose the best one and ignore the others

B Ignore any anomalous results and average the others

C Choose the middle measurement and average it

D Include any anomalous results and average all the results

30. The thermistor is used as part of a switch controlling a heater.

When the current in the thermistor is 0.5mA the heater switches off.

The temperature of the thermistor when the heater is switched off is about

A 2

o

CB 12

oC

C 19oC

D 58oC


10/14

Test A

Test A 10

Four students are discussing the differences between direct (DC) and alternating (AC) current.

31. Which one of them is correct?

A Anne

B Bob

C Catherine

D Dan

32. One of the students in his description of AC gave the definition of convectional current.

A Anne

B Bob

C Catherine

D Dan

Anne Bob

Catherine Dan

DC: only electrons move.

AC: electrons move in one

direction and positive ions in

the opposite direction.

DC: when we show how negative

electrons move.

AC: when we show how positive

particles move.

DC: electrons move in one

direction only.

AC: electrons move

backwards and forwards.

DC: Only positive particles move.

AC: both positive and negative

particles move in the same

direction.


11/14

Test A

Test A 11

A magnet is pushed towards a coil connected to an ammeter.

The arrow is proportional to the speed the magnet is moved.

John and Mary are making predictions how to increase the deflection.

33. Which one is correct?

A John only

B Mary only

C both

D neither

Four actions are tried then with the magnet and the coil.

34. Which actions can produce the deflection shown below?

A 1 & 3 only

B 2 & 3 only

C 2 & 4 only

D 4 only

S N

1 2 3 4

S N N S N S

S N

John Mary

We can increase the

number of turns of the

coil.

We can increase the

distance between the

magnet and the coil.


12/14

Test A

Test A 12

35. Coils and magnets are used to produce

A DC in power stations

B AC in dynamos

C DC in batteries

D AC in cells

Some students plot the graph below.

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

-10 - 8 -6 -4 -2 0 2 4 6 8 10

Voltage (V)

C

urrent(A)

The students are asked to comment on the graph.

36. Which two students are correct?

A Anne and Bob

B Anne and Dan

C Catherine and Bob

D Catherine and Dan

Anne Bob

Catherine Dan

The resistance of the bulb is

higher when the voltage is higher.


lower when the voltage is higher.


the same no matter which

direction the current has.

The resistance of the bulb is the

lower when the current flows in the

negative direction.


13/14

Test A

Test A 13

Below we see how the voltage provided by different cells changes as the time of use increases.

0

5

10

15

20

25

30

0 2 4 6 8 10

Time of use (hrs)

Volt

age(V)

ReUs

HiVo

ReUs is a rechargeable cell.

HiVo is a non-rechargeable cell that provides a higher voltage than most other similar cells.

37. What is the main advantage of a HiVo cell compared to a ReUs cell?

A It provides more voltage for a longer amount of time

B The voltage it provides falls at a higher rate than that of ReUs

C It costs less as you do not need a charger

D It can supply a constant voltage for long periods

The minimum working voltage of a device is 15 V, i.e. the device stops working if the voltage

drops below 15 V.

38. Which cell will keep the device working for a longer period?

A ReUs since it canwork for 7 hrs compared to 4 hrs of HiVo

B HiVo since it canwork for 7 hrs compared to 4 hrs of ReUs

C ReUs since it canwork for 4 hrs compared to 7 hrs of HiVo

D HiVo since it canwork for 4 hrs compared to 7 hrs of ReUs

Electric circuits

Dave investigates the current in a lamp.Here is part of his circuit.

Dave uses the variable resistor to change the current.

39. Dave wants to measure the current in the lamp.

He should connect

A a voltmeter in series with the lamp

B a voltmeter in parallel with the lamp

C an ammeter in series with the lamp

D an ammeter in parallel with the lamp


14/14

Test A

Test A 14

40. Which row of the table is correct for Daves circuit?

KS4 / P1a.09 Producing and measuring electricity test 10_ 11 MCA answers

Documents

Transcript of KS4 / P1a.09 Producing and measuring electricity test 10_ 11 MCA answers