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Worksheets

Magnetism & Electricity

Total questions: 50

Worksheet time: 29mins

Name
Class
Date
1.

Energy is measured by

a)

Watt.hr

b)

watt

c)

Kilo Watt

d)

Kilo Volt

2.

The resistance of the ideal conductor is

a)

very low

b)

medium

c)

high

d)

very high

3.

Insulator

a)

doesn't allow current to pass

b)

allows current to pass

c)

has low resistance

d)

has low voltage

4.
A strong, short-lived magnet created by a looped current.
a)
Electromagnet
b)
Current
c)
Electricity
d)
Generator
5.
A machine that converts mechanical, nuclear or chemical energy into electrical energy.
a)
Motor
b)
Generator
c)
Electromagnet
d)
Circuit
6.
A completed path for the transfer of electricity
a)
generator
b)
motor
c)
circuit
7.

Resistivity, the inverse of conductivity, is only dependent on which of the following? (choose one)

a)

shape of the wire

b)

length of the wire

c)

cross-sectional area of the wire

d)

type of metal

8.

The resistance of a material

a)

depends on its resistivity and the geometric properties of the material.

b)

does not depend on its resistivity or the geometric properties of the material.

c)

depends on its resistivity but not the geometric properties of the material.

d)

does not depend on its resistivity but on the geometric properties of the material.

9.

Which of the following aluminum wires would have the greatest resistance?

a)

3 cm in length and 2 cm in diameter

b)

6 cm in length and 2 cm in diameter

c)

9 cm in length and 2 cm in diameter

d)

12 cm in length and 2 cm in diameter

10.

Which of the following aluminum wires would have the greatest resistance?

a)

3 cm in length and 2 cm in diameter

b)

6 cm in length and 2 cm in diameter

c)

9 cm in length and 2 cm in diameter

d)

12 cm in length and 2 cm in diameter

11.

Which of the following statements are true?

a)

Voltage will not exist without any current

b)

Batteries are the source charges in a current

c)

Currents will not exist without any voltage

d)

Current travels through wires near light speeds

12.

How will increasing the amount of resistance in a circuit affect the current if the voltage remains constant?

a)

It will increase

b)

It will not change

c)

It will decrease

d)

It will cease

13.

If a light bulb burns out in a series circuit, the total current

a)

remains unchanged

b)

becomes zero

c)

is increased a little

d)

is decreased a little

14.
Which best describes a parallel circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from one source. 
c)
Electricity flows along more than one pathway. 
d)
The flow of electricity comes from more than one source. 
15.

What is the definition of electrical current?

a)

The opposition to the flow of electrons

b)

The rate of flow of charge

c)

The work done on each coulomb of charge

d)

Electrons moving around

16.
This allows the flow o charges to be controlled
a)
Electrical Conductor
b)
Direct Current
c)
Alternating Current
d)
Semiconductor
17.
The opposition to the flow of electric charges
a)
Open  Circuit
b)
Closed Circuit
c)
Semiconductor
d)
Resistance
18.
Lightning is an example of _________.
a)
static electricity
b)
current electricity
c)
watts
d)
voltage
19.
Electricity is the flow of _________.
a)
protons
b)
neutrons
c)
electrons
20.

create voltage from magnetic coil

a)

resistors

b)

capacitors

c)

inductors

d)

transformers

21.

store voltage up to a point and release it

a)

resistors

b)

capacitors

c)

inductors

d)

transformers

22.

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

a)

1 Ohm

b)

3 Ohms

c)

4 Ohms

d)

12 Ohms

23.

If the Voltage stays the same and Resistance is increased, Current will

a)

Increase

b)

Decrease

c)

Stay the same

d)

X

24.

If the battery produced 12.6 Volts what would be the current flow for a 6 Ohm resistor?

a)

2.1 Amps

b)

2.4 Amps

c)

1.71 Amps

d)

15 Amps

25.

Which equation can be rearranged to calculate the the electric current given?

a)

I = Q ÷ t

b)

Q = It

c)

I = Qt

d)

I = t ÷Q

26.

Calculate the quantity of charge, Q, obtained when a current of 25 amps runs for 1 minute

a)

Q = 1,800 C

b)

Q = 1,500 C

c)

Q = 1000 C

d)

Q = 3000 C

27.

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

a)

0.15 A

b)

3600 A

c)

6.25 A

d)

0.16 A

28.
Electromagnetic induction is change in ___________________. 
a)
surface area
b)
magnetic poles
c)
magnetic flux
29.

Which of the devices is not based on electromagnetic induction?

a)

Generator

b)

electrodynamic microphone

c)

transformer

d)

electric motor

30.

Provide the correct statements.

1. EMF self-induction occurs when passing through a DC coil;

2. Self-induction EMF occurs when passing through an AC coil;

3. EMF self-induction counteracts current flow;

4. EMF self-induction counteracts current changes.

a)

2 & 3;

b)

2 & 4;

c)

1 &3

d)

1 & 4

31.

The induction current in the horizontally arranged coil has the direction shown in the figure. Provide statements that do not correctly explain the occurrence of this current.

1. Top of the ring is made by the N-Pole of permanent magnet.

2. Top of the ring is made by the S-Pole of permanent magnet.

3. The N-pole of the magnet is removed from the ring upwards.

4. The S-pole of the magnet is removed from the ring upwards.

a)

Only 1;

b)

1 & 4;

c)

Only 2;

d)

2 & 3.

32.

The coil has 500 turns. When the current is changed to 2 A, the magnetic flux through each turn changes by 4 mWb. Determine the inductance of the coil.

a)

2 H

b)

0,2 H

c)

1 H

d)

0,1 H

33.
Thrust a magnet into a coil of wire. While the magnet is being moved toward the coil 
a)
(a) becomes an electromagnet
b)
(b) has a current in it
c)
(c) both of these 
d)
(d) neither of these
34.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage 
a)
quadruples
b)
doubles
c)
is the same
d)
halves
35.
A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called
a)
a transformer
b)
a motor
c)
a generator
d)
a dipole
36.
Electromagnetism is when
a)
magnetism causes electricity
b)
electricity causes magnetism
c)
electricity and magnetism cancel each other out
d)
a strong magnet creates a permanent magnet
37.

Which coil will have the largest flux?

a)

A

b)

B

c)

C

d)

D

38.

If the magnetic field were increased from B = 0.5 T to 1.0T, the flux through the loop would

a)

increase

b)

decrease

c)

remain the same

39.

Electro motive force induced by motion of conductor across magnetic field is called

a)

EMF

b)

motional EMF

c)

rotational EMF

d)

static EMF

40.

Self-induced EMF is sometimes also known as

a)

induced EMF

b)

deduce EMF

c)

back EMF

d)

both a and b

41.

Self-induced EMF is sometimes also known as

a)

induced EMF

b)

deduce EMF

c)

back EMF

d)

both a and b

42.

The direction of the force on a current-carrying wire placed in a magnetic field depends on

a)

the direction of the current

b)

the direction of the field

c)

the direction of current as well as field

d)

neither the direction of current nor the direction of field

43.

The magnetic field lines due to a straight wire carrying a current are

a)

straight

b)

circular

c)

parabolic

d)

elliptical

44.

A straight wire of length 0.5m and carrying current 1.2A is placed in uniform magnetic field of induction 2T, applied perpendicular to the length of the wire. The force on the wire is

a)

2.4 N

b)

1.2 N

c)

3.0 N

d)

2.0 N

45.

The current in a hair dryer measures 15.0 Amps. The resistance of the appliance is 8.0 ohms. What is the voltage?

a)

120 V

b)

0.5 V

c)

7.0 V

d)

1800 V

46.
The picture is an example of an:
a)
Electric circuit
b)
Electromagnet
c)
Electric nail
d)
Electric power cell
47.

Define electromagnetic induction

a)

Cutting of magnetic flux

b)

Change of magnetic flux

c)

Producing of current when there is a megnetic flux cutting

d)

None of above three

48.
Surrounding every moving electron is 
a)
(a) a magnetic field
b)
(b) an electric field
c)
(c) both of these
d)
(d) none of these
49.
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
50.
 What does a moving charged particle experience if it moves through a static magnetic field?
a)
a. nothing
b)
b. an acceleration in the current direction
c)
c. a deflection that is parallel to the magnetic field
d)
e. a deflection that is perpendicular to both the magnetic field and the current

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