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Chapter 7 Electricity and Magnetism

Total questions: 50

Worksheet time: 1hrs 2mins

Name
Class
Date
1.

What is the unit for energy?

a)

newton

b)

joule

c)

force

d)

volt

e)

ampere

2.

Energy __________ be created and destroyed.

a)

can

b)

cannot

3.

Which one is renewable energy?

(there is more than 1 answer)

a)

fossil fuel

b)

water

c)

solar

d)

radioactive substances

e)

wind

4.

What is the energy change for a burning candle?

a)

chemical energy → light energy

b)

chemical energy → heat energy + kinetic energy

c)

light energy → heat energy + chemical energy

d)

chemical energy → light energy + heat energy

5.

What is the name of positive charge?

a)

electron

b)

neutron

c)

proton

d)

nucleus

6.

What is the name of negative charge?

a)

neutron

b)

electron

c)

proton

d)

nucleus

7.

Like charges _________ each other.

a)

attract

b)

repel

c)

touch

8.

Unlike charges ________ each other.

a)

repel

b)

attract

c)

touch

9.

P is positively- charged.

What charge is Q?

a)

positive

b)

negative

c)

neutral

10.

What is the name of this tool?

a)

insulator

b)

dosimeter

c)

electroscope

d)

microscope

11.

What is the unit for voltage?

a)

ampere

b)

current

c)

volt

d)

resistance

12.

What is the unit for current?

a)

volt

b)

voltage

c)

ohm

d)

ampere

13.

The longer the wire,

the _________ the resistance.

a)

lower

b)

greater

14.

____________is the quantity of electricity that is measured by the ammeter.

a)

Voltage

b)

Current

c)

Resistance

d)

Magnetic field

15.

Name of the electric component

a)

Bulb

b)

Rheostat

c)

voltmeter

d)

Dry cell

16.

Name of the electric component

a)

Bulb

b)

Rheostat

c)

voltmeter

d)

Dry cell

17.

Name of the electric component

a)

Bulb

b)

Rheostat

c)

voltmeter

d)

Dry cell

18.
What do you call the attraction or repulsion of magnetic poles?
a)
magnetic force
b)
direct current
c)
transformer
d)
electricity
19.
A magnetic field is the___________.
a)
area of magnetic force around a magnet.
b)
where the Minnesota Twins play baseball.
c)
where electrical currents repel atoms.
d)
opposite of an electromagnet.
20.
When creating an electromagnet, how can you increase its magnetic strength?
a)
Use a single wire.
b)
Tightly coil the wire with multiple loops.
c)
Decrease the electrical current.
d)
Use a weaker core.
21.

Which one is the circuit diagram of this picture?

a)
b)
c)
d)
22.

The higher ↑ the resistance, the ________ the current.

a)

lower ↓

b)

higher ↑

23.

As the voltage increases ↑, what happens to the current?

a)

Current stays the same

b)

Current increases ↑

c)

Current decreases ↓

24.

The current in a hair dryer measures 15.0 A. The resistance of the appliance is 8.0 Ω. Find the voltage?

a)

120 V

b)

1.9 V

c)

0.5 V

d)

12 V

25.

Each time a lightbulb is added to a series circuit, the other bulbs in the circuit __________.

a)

get brighter

b)

get dimmer

c)

stay the same brightness

d)

will explode

26.

The total resistance, R of this circuit is ______.

a)

1.05 Ω

b)

11.0 Ω

c)

2.05 Ω

d)

3.67 Ω

27.

What do the lines around this magnet represent?

a)

North Pole

b)

South Pole

c)

Magnetic Declination

d)

Magnetic Field

28.

Which of the following devices DOES NOT used an electromagnet?

a)

Refrigerators

b)

Cranes

c)

Electric bells

d)

Credit cards

29.

In parallel circuit, there are _________ pathways for charge to flow.

a)

One

b)

Two or more

c)

None

d)

Zero

30.

If we add more light bulbs into a parallel circuit, how will the brightness of the bulbs change?

a)

It will get dimmer

b)

It will get brighter

c)

The brightness will stay the same

d)

None of the light bulb will be on

31.

What is the advantage of having a safety switch or fuse in the electric circuits of your house?

a)

Safety switches break the circuit when there is no fault

b)

Safety switches switch the electrical current

c)

It prevents the circuit from overheating and starting the fire

d)

Fuses are fused together with electrical wires

32.

Name the electric component below:

Namakan komponen elektrik berikut:

a)

Dry cell

Sel kering

b)

Bulb

Mentol

c)

Switch

Suis

d)

Wire

Wayar

33.

What is the current of a series circuit with values of 5, 9, 17 ohms, with a battery of 12V

a)

0.3871

b)

3870.0

c)

372.0

d)

4.4395

34.

Three resistors, RA=10 ΩR_A=10\ \Omega  , RB =20 ΩR_B\ =20\ \Omega  , and  RC = 25 ΩR_C\ =\ 25\ \Omega  , are connected in SERIES. The total resistance of this setup is equal to _____.

a)

 0.19 Ω0.19\ \Omega  

b)

 5.26 Ω5.26\ \Omega  

c)

 18.33 Ω18.33\ \Omega  

d)

 55 Ω55\ \Omega  

35.

Solve for the total resistance of the circuit shown

a)

50 V

b)

1970 ohms

c)

705 K ohms

d)

20 Amps

36.

Solve for total Current in the circuit shown

a)

25 A

b)

35 A

c)

25 mA

d)

35 mA

37.

A series circuit has 2 light bulbs in it. Each light bulb has the same resistance. Identify the voltage across each light bulb if the battery supplies 12 V

.

a)

12 V

b)

8 V

c)

6 V

d)

4 V

38.

In the circuit below, the battery supplies 4 V

to the light bulbs. This is a parallel circuit with two branches.

Identify the voltage across each of the light bulbs.

a)

2 V

b)

1 V

c)

6 V

d)

4 V

39.
As the number of resistors increase, the total resistance ___________ and the total current ____________
a)
Increase, decrease
b)
Decrease, increase
c)
Increase, increase
d)
Decrease, decrease
40.
Total resistance in a series circuit
a)
Rt = R1 + R2 + R3 ...
b)
1/Rt = 1/R1 + 1/R2 ...
c)
Rt = R1 X R2 / R1 + R2 ...
d)
Rt = RN / RV 
41.

The total current through this circuit is

a)

0.02 A

b)

0.09 A

c)

50 A

d)

9 A

42.
What is the total voltage (VTotal) across this circuit?
a)
1.5 V
b)
9 V
c)
3 kΩ
d)
10 kΩ
43.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
44.

Three 8.0-ohms resistors are connected in series. What is their equivalent resistance?

a)

24.0 ohms

b)

8.0 ohms

c)

0.38 ohms

d)

0.13 ohms

45.

If RE is 5 ohms and I4 is 2 amps, what is VT?

a)

10 volts

b)

6 amps

c)

2.5 ohms

d)

5 volts

46.

If all three resistors are 6 ohms, what is the effective resistance of the circuit?

a)

2 ohms

b)

6 amps

c)

12 ohms

d)

0.5 ohms

47.

What type of magnet is this?

a)

a bar magnet

b)

a "U" magnet

c)

a horseshoe magnet

d)

a stick magnet

48.
Where is the strongest attraction force of the magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
49.

Although magnetic fields are _____________, one common way that people investigate them is to use ________ filings.

a)

invisible, iron

b)

touchable, iron

c)

invisible, plastic

d)

touchable, plastic

50.

The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.

a)

opposite

b)

like

c)

positive

d)

negative

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