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FORM 5 PHY C3 ELECTROMAGNETISM Final test

Total questions: 50

Worksheet time: 4hrs 10mins

Name
Class
Date
1.

What happens to the strength of a magnetic field as you move away from the magnet?

a)

The strength of the magnetic field increases.

b)

The strength of the magnetic field doesn't change.

c)

The strength of the magnetic field is doubled.

d)

The strength of the magnetic field decreases.

2.

The picture above is an example of what?

a)

Magnetic field

b)

Electric field

c)

Repulsion

d)

Attraction

3.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
4.
How do you make an electromagnet stronger?
a)
Add a motor and/or lightbulbs
b)
Add more light bulbs and/or wire coils
c)
add more wire coils and/or a switch
d)
add more wire coils and/or batteries
5.

What does this image show?

a)

Parallel circuit

b)

Series circuit

c)

Magnet

d)

Electromagnet

6.

The area of magnetic force around a magnet is known as its ____________.

a)

magnetism

b)

magnetic current

c)

magnetic field

d)

electric current

7.

Increasing the number of coils in an electromagnet will _________ the power of the magnet.

a)

decrease

b)

increase

c)

not affect

8.

What type of core is best for electromagnets?

a)

Steel

b)

Iron

c)

Plastic

d)

Copper

9.

As the strength of a magnetic field increases, the ability to attract metal objects ____________.

a)

increases

b)

decreases

c)

stays the same

10.

What conclusion can you draw from this graph?

a)

As current increases, magnetic strength decreases.

b)

As current increases, magnetic strength increases.

c)

As current decreases, magnetic strength increases.

d)

There is no relationship between current and magnetic strength.

11.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
12.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
13.
What happens to current when the resistance decreases and the voltage remains constant ?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Turns into ice cream
14.
What is the direction of the induced magnetic field?
a)
Left
b)
Right
c)
Up
d)
Down
15.
What is the direction of the induced magnetic field?
a)
Left
b)
Right
c)
Up
d)
Down
16.
In what direction is the magnet moving?
a)
Left
b)
Right
c)
Up
d)
Down
17.
In what direction is the magnet moving?
a)
Left
b)
Right
c)
Up
d)
Down
18.
When do we have self induction?
a)
When the magnet moves into the coil
b)
When the coil moves into the magnet
c)
When a constant current passes through the coil
d)
When a changing current passes through the coil
19.
Which of the following is NOT an application of Lenz's Law
a)
Transformers
b)
AC generator
c)
A coil traversed by AC current
d)
A DC motor
20.
___ Law says that the Induced current is proportional to the change of magnetic flux 
a)
Lenz'
b)
Faraday's
c)
Ampere's
21.
Find the direction of the magnetic force.
a)
Into the screen
b)
Out of the screen
c)
Right
d)
Left
22.
In 1831 who discovered electromagnetic induction?
a)
Thomas Edison
b)
Nikola Tesla
c)
Michael Faraday
23.

Can you produce current in a wire with a magnet that is sitting still?

a)

Yes; having a magnet near a wire is enough to excite the electrons

b)

No; the magnetic field has to be changing to excite the electrons

c)

No; magnets cannot create electricity

24.

A coil spins in a magnetic field. Of the following

which causes an increase in the induced EMF in

the coil?

a)

Spinning the coil faster

b)

Removing the coil from the magnetic field

c)

Keeping the flux at a constant rate

d)

Decreasing the number of turns of wire in

the coil

25.
Voltage can be induced in a wire by
a)
a. moving the wire near a magnet.
b)
b. moving a magnet near the wire.
c)
c. changing the current in a nearby wire.
d)
d. all of these
26.
A magnet can move in a coil of wire to produce electricity in which system?
a)
Generator
b)
Motor
c)
Magnet
d)
Transformer
27.
What would happen if I move a bar magnet in and out of a coil of copper wire?
a)
Electric current would disappear 
b)
The magnet would explode 
c)
Electric current will flow through the wire
d)
It would produce a gravitational field
28.

What does the direction of the pointing fingers mean in this picture?

a)

the direction of the voltage

b)

the rotation of the wire

c)

the direction of the magnetic field

d)

the direction of the current

29.

A transformer is ...

a)

a rotating machine

b)

an electromechanical energy converter

c)

an electromagnetic machine

d)

AC-DC machine

30.

The function of a transformer is to ...

a)

raise and lower the apparent power levels

b)

transfer DC voltage from the primary winding to the secondary winding

c)

increase or decrease A.C voltage or A.C current levels

d)

transform mechanical energy into electrical energy

31.

Primary winding of a transformer is determined by ...

a)

which winding is nearer to the load

b)

which winding is connected to the source

c)

which winding has more turns

d)

which side has the highest voltage

32.

Insulators are put between core lamination ...

a)

to prevent flux leaks to the neighboring steel sheet

b)

to reduce the cross-sectional area of the core

c)

to prevent short circuit in the transformer

d)

to prevent rusting in the lamination

33.

The electrical energy is transferred through the ... in a transformer.

a)

electric field

b)

rotor

c)

air space

d)

magnetic field

34.

Rajah menunjukkan satu litar yang mengandungi sebuah transformer yang unggul.Pernyataan yang manakah adalah benar mengenai kecerahan mentol P dan mentol Q?

a)

Mentol P adalah lebih cerah daripada Q

b)

Mentol P dan Q adalah sama cerah

c)

Mentol Q adalah lebih cerah daripada P

35.

Gambar rajah menunjukkan struktur sebuah transformer unggul.Berapakah beza keupayaan merentasi mental itu?

a)

7 V

b)

24 V

c)

30 V

d)

60 V

36.

Fungsi transformer dalam sistem penghantaran tenaga elektrik adalah untuk

a)

meninggikan kuasa

b)

merendahkan rintangan

c)

mengubah beza keupayaan

d)

mempercepatkan masa penghantaran

37.

Rajah menunjukkan sebuah transformer ringkas. Mentol menyala dengan kecerahan normal.Apakah yang berlaku apabila bekalan input a.u. diganti dengan bateri 3 V?

a)

Mentol tidak menyala

b)

Kecerahan mentol tidak berubah

c)

Kecerahan mentol bertambah

d)

Mentol terbakar

38.

Rajah menunjukkan satu litar elektrik yang mengandungi satu transformer injak turun dan dua mentol yang serupa P dan Q.Perbandingan manakah yang betui tentang kecerahan mentol P dan Q?

a)

Kecerahan P = Kecerahan Q

b)

Kecerahan P > Kecerahan Q

c)

Kecerahan P < Kecerahan Q

39.

Jadual menunjukkan rintangan bagi empat dawai dengan ketebalan yang sama poda suhu bilik.Antara dawai A, B, C dan D, yang manakah digunakan dalam suatu gegelung transformer untuk meningkatkan kecekapan transformer itu?

a)

A

b)

B

c)

C

d)

D

40.

Rajah menunjukkan Rangkaian Grid Kebangsaan untuk penghantaran tenaga elektrik.Transformer Q ialah transformer

a)

injak naik

b)

injak turun

c)

unggul

d)

grid

41.

Transformer injak turun manakah yang berfungsi?

a)
b)
c)
d)
42.

Berikut adalah cara untuk mengurangkan kehilangan tenaga di dalam satu transformer kecuali

a)

Menggunakan teras besi lembut

b)

Teras besi berlamina

c)

Menggunakan dawai kuprum tebal

d)

Meletakkan gegelung primer jauh dari gegelung sekunder

43.

Apakah yang perlu dilakukan untuk mengurangkan daya gerak elektrik (d.g.e) teraruh di dalam gegelung sekunder satu transformer?

a)

Menambahkan daya gerak elektrik (d.g.e) di dalam gegelung primer

b)

Menambahkan arus dalam gegelung primer

c)

Mengurangkan voltan di dalam gegelung sekunder

d)

Mengurangkan bilangan lilitan di dalam gegelung sekunder

44.

Rajah menunjukkan satu struktur transformer yang unggul.Berapakah beza keupayaan yang merentasi mentol itu ?

a)

4 V

b)

6 V

c)

96 V

d)

200 V

45.

Gambar rajah menunjukkan transformer M dan transformer N. Transformer N lebih cekap sebab

a)

arus pusar lebih kecil

b)

histerisis tidak berlaku

c)

rintangan gegelung lebih kecil

d)

kebocoran fluks magnet lebih kecil

46.

Rajah menunjukkan suatu transformer.Apakah bacaan voltmeter?

a)

1.2 V

b)

12 V

c)

120 V

d)

1200 V

47.

Apakah nisbah bilangan lilitan gegelung sekunder Ns kepada bilangan lilitan gegelung primer Np?

a)

40 : 2

b)

20 : 1

c)

1 : 20

d)

2 : 40

48.

Berdasarkan rajah, jika gegelung primer mempunyai 1200 lilitan, berapakah bilangan lilitan yang diperlukan untuk gegelung sekunder?

a)

24 000

b)

1 200

c)

600

d)

60

49.

Antara berikut, yang manakah betul tentang transformer P dan Q?

a)

P = Transformer injak turun

Q = Transformer injak turun

b)

P = Transformer injak naik

Q = Transformer injak naik

c)

P = Transformer injak naik

Q = Transformer injak turun

d)

P = Transformer injak turun

Q = Transformer injak naik

50.

Rajah menunjukkan sebuah transformer yang mempunyai kecekapan 80%. Jika ia menghasilkan kuasa output 100 W, berapakah arus yang mengalir dalam gegelung primer?

a)

6.25 A

b)

5.15 A

c)

4.00 A

d)

3.75 A

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