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Semester II: Module 3: Chapter 4: Electromagnetism

Total questions: 75

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

Charged particles that flow continuously through material is called

a)

Insulator

b)

Electric Current

c)

Flashlight

d)

closed circuit

2.

Electrical current will pass easily through metals such as copper, aluminum and gold. These metals are good

a)

things

b)

insulators

c)

charged particles

d)

conductors

3.
To have a complete electric circuit, the path must be _____
a)
small
b)
closed
c)
big
d)
open
4.
Within a circuit, the number of electrons flowing from a power source is _____ the number of _____ returning to the source
a)
much less than, paths
b)
the same as, electrons
c)
much less than, electrons
d)
the same as, paths
5.
The symbol for 1 _____ is A
a)
acceleration
b)
current
c)
ampere
d)
coulomb
6.
An electric current is made up of _____ charged electrons
a)
neutral
b)
negative
c)
positive
d)
balanced
7.
A lit lightbulb is an example of the _____ of electrical energy to another forms of energy
a)
movement
b)
conversion
c)
transfer
d)
fluctuation
8.
A flash of lightning is an example of an electric _____
a)
watt
b)
voltage
c)
current
d)
resistance
9.
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
a)
A positive charge.
b)
A negative charge.
c)
A neutral charge
d)
No charge at all
10.
Two like charges:
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
11.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
12.

Which of the following can move from one atom to another?

a)

protons

b)

neutrons

c)

electrons

d)

the nucleus

13.

An object with a negative charge will be most strongly attracted to which of the following?

a)

an object with a weak positive charge

b)

an object with a strong positive charge

c)

an object with a weak negative charge

d)

an object with a strong negative charge

14.
If the voltage across the battery was 10V in this diagram. What would the voltage across each bulb be?
a)
10V
b)
5V
c)
20V
d)
0V
15.
The difference in electrical potential energy between two places is called
a)
resistance
b)
friction
c)
induction
d)
voltage
16.
The voltage across each bulb is 9V.  What is the voltage across the cell?
a)
4.5
b)
9
c)
18
d)
27
17.

What unit is used to measure current?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

18.

What unit is used to measure resistance?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

19.

What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts?

a)

1/4 A

b)

144 A

c)

4 A

d)

0.4 A

20.

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

a)

1/3 ohms

b)

3 ohms

c)

27 ohms

d)

9 ohms

21.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

22.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
23.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
24.
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
25.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
26.

What is the formula for ohms law?

a)

1+2=3

b)

R X E = I

c)

V =I x R

d)

E= MC squared

27.
How do you calculate voltage?
a)
Current X Resistance
b)
Resistance ÷ Current
c)
Current ÷ Resistance
d)
Measure it with a ruler
28.
What voltage is needed to cause a 2A current flow through a 10Ω resistor?
a)
5V
b)
0.2V
c)
20V
d)
200V
29.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
30.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
d)
It depends
31.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
d)
complex circuit
32.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
33.
This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?
a)
3 Amps
b)
192 Amps
c)
2 Amps
d)
4 Amps
34.

Which factor does not affect resistivity?

a)

Length

b)

Mass

c)

Cross-sectional area

d)

Temperature

35.

The unit of resistivity is

a)

Ω/m

b)

Ω/m2

c)

Ω.m

d)

Ω.m2

36.

The nichrome wire has a cross-sectional area of 1.3 × 10–7 m2 . Resistivity of nichrome = 1.1 × 10–6Ωm and a resistance of 53Ω. The length of the wire is

a)

0.63m

b)

63m

c)

0.0063m

d)

6.3m

37.

A copper wire of length 2.5 m and cross-sectional area 2.4 × 10-7 m2 has a resistivity of 1.7x10-8Ωm. What is the resistance of the wire?

a)

1.6x10-15Ω

b)

1.0x10-14Ω

c)

0.18Ω

d)

5.6Ω

38.

Resistance of a material would be equal to resistivity when

a)

l = T

b)

A = l

c)

A = T

d)

l = R

39.

A cylindrical conductor of length l, diameter D, and resistivity ρ has a resistance R. What is the resistance of another cylindrical conductor of length l, diameter D/2 , and resistivity ρ?

a)

8R

b)

4R

c)

2R

d)

R

40.

A wire of uniform diameter 0.28mm and a length of 1.50m has a resistance of 45Ω. It's resistivity is

a)

2.2 x 10-8Ωm

b)

36 Ωm

c)

1.8 x 10-6Ωm

d)

3.4 x 10-7Ωm

41.

Resistivity

a)

changes with conditions

b)

relies on dimensions of the material

c)

inversely proportional to resistance

d)

a property of the material

42.

Resistance is proportional to

a)

l

b)

1ρ\frac{1}{\rho}

c)

A

d)

1l\frac{1}{l}

43.

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

a)

R/4

b)

R/2

c)

2R

d)

4R

44.

What is the effective resistance of this circuit?

a)

100Ω

b)

200Ω

c)

300Ω

d)

400Ω

45.

What is the effective resistance of this combination?

a)

2 kΩ

b)

1 kΩ

c)

5 kΩ

d)

500 Ω

46.

What is the effective resistance of this combination?

a)

5 kΩ

b)

1.2 kΩ

c)

1 kΩ

d)

833 Ω

47.

What is the total effective resistance of these three resistors?

a)

3 kΩ

b)

5 kΩ

c)

7 kΩ

d)

18 kΩ

48.

What is the current flowing in this circuit?

a)

20 μA

b)

20 mA

c)

20 nA

d)

20 A

49.

What is the current in the 1kΩ resistor?

a)

12 mA

b)

6 mA

c)

1.2 mA

d)

0.6 mA

50.

What is the voltage across the 2 kΩ resistor?

a)

12 V

b)

8 V

c)

4 V

d)

6 V

51.

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

a)

1.6 A going in

b)

1.6 A going out

c)

6.8 A going in

d)

6.8 A going out

52.

Current is shared between two resistors of 3 Ω and 6 Ω, if the current in the 6 Ω is 12 A what is the total incoming current?

a)

24 A

b)

36 A

c)

18 A

d)

72 A

53.

Select the correct statement:

a)

The current in parallel resistors is always equal.

b)

The sum of the sources of EMF and volt-drops in a closed loop is zero.

c)

The sum of the currents in a closed loop is zero.

d)

The sum of the voltages at a node is zero.

54.

Which statement is correct?

a)

The current in parallel resistors is always equal.

b)

The sum of the electric potential differences (or voltages) around a loop add to zero.

c)

The sum of the currents in a closed loop is zero.

d)

The sum of the voltages at a node is zero.

55.

"The sum of all voltage drops in a series circuit equals the total applied voltage." This is know as what?

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

56.

"The total current in a parallel circuit equals the sum of the individual branch currents."

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

57.

Power is measured in what units?

a)

Ohms

b)

Volts

c)

Amperes

d)

Watts

58.

What does Kirchhoff's second law show?

a)

conservation of charge

b)

conservation of energy

c)

In any closed loop, the sum of the e.m.f. is equal to the sum of the products of the current and the resistance (potential difference).

d)

The sum of the current entering a junction is the sum of the current leaving the junction.

59.

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will

a)

(a) change in previous direction

b)

(b) not change

c)

(c) change in opposite direction

d)

(d) none of these.

60.

The magnetic field lines near a long straight wire carrying current are:

a)

Straight lines

b)

Concentric rings

c)

Spiral lines

d)

Radial lines

61.

According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by:

a)

Thumb

b)

Curl fingers

c)

Middle finger

d)

First finger

62.

According to right hand thumb rule the direction of magnetic field in a current carrying circular coil is denoted by

a)

Thumb

b)

Middle finger

c)

Curl finger

d)

First finger

63.

Magnetic field arises due to

a)

flow of steady current through a current element

b)

flow of charges

c)

flow of steady current through an infinite wire

d)

flow of steady current through a closed loop

64.

What is the unit of magnetic field?

a)

ampere

b)

watt

c)

kilowatt hour

d)

tesla

65.

1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

a)

A. Directed to the right

b)

A. Directed to the left

c)

A. Equal to the magnetic field

d)

In the same direction as the magnetic field

66.

In moving coil galvanometer, the pole faces of U-shaped magnet are made concave

a)

to make the field radial

b)

to increase the field

c)

to weaken the field

d)

both (a) and (b)

67.

In a moving coil galvanometer, the deflection of the coil Φ is related to the electric current i by the relation

a)

I ∝ tanΦ

b)

I ∝ Φ

c)

I ∝ Φ2

d)

I ∝ tan2Φ

68.

The sensitivity of a moving coil galvanometer can be increased by decreasing

a)

the number of turns in the coil

b)

the area of the coil

c)

the magnetic field

d)

the restoring torque per unit twist of the suspension

69.

A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is

a)

NA2B2I

b)

NABI2

c)

N2ABI

d)

NABI

70.

What is the principle of Moving Coil Galvanometer.

a)

Current carrying coil in an electric field experiences a force

b)

Current carrying coil in magnetic field experiences no force

c)

Current carrying conductor in magnetic field experiences a force

d)

Current carrying conductor in an electric field produces no force

71.

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

72.

How does an ammeter is added in the circuit?

a)

Series

b)

Parallel

73.

How does a voltmeter meter is added in the circuit?

a)

Series

b)

Parallel

74.

An ammeter must have

a)

Low resistance so that it does affect the current through the main circuit

b)

High resistance so that it does affect the current through the main circuit

c)

Low resistance so that it does affect the voltage across the resistor

75.

A voltmeter must have

a)

Low resistance so that it does affect the current through the main circuit

b)

High resistance so that it does affect the current through the resistor

c)

Low resistance so that it does affect the voltage across the resistor

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