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PHY201_PracticeQuiz

Total questions: 170

Worksheet time: 5hrs 18mins

Name
Class
Date
1.

Which of the following images is correct?

a)

A,B,C

b)

A and C

c)

B and D

d)

D only

e)

All are correct

2.

If an electron moves at 10^6 m/s in a magnetic field of 500 T, where the angle between the velocity vector of the electron and the magnetic field is 37 degrees, what is the Lorentz force felt by the electron?

a)

1.6 x 10^-11 N

b)

4.8 x 10^-11 N

c)

6.4 x 10^-11 N

d)

1.6 x 10^-19 N

e)

4.8 x 10^-19 N

3.

A rectangular coil with a length of 12 cm and a width of 10 cm consists of 40 turns and carries a current of 2 A. The coil is in a magnetic field of 0.25 T. What is the magnitude of the torque experienced by the coil?

a)

0.06 Nm

b)

0.10 Nm

c)

0.24 Nm

d)

0.36 Nm

e)

0.48 Nm

4.

What is the direction of the field?

a)

into the plane

b)

out of the plane

c)

parallel to the plane

5.

If the red arrow is the current, what is the direction of the force?

a)

to the left

b)

to the right

c)

there is no force

d)

into the plane

6.

What was the direction of the current?

a)

to the left

b)

to the right

c)

into the plan

d)

out of the plane

7.

What is the direction of the current?

a)

upwards

b)

downwards

c)

to the left

d)

42

8.

There is no force if...

a)

there is too much current

b)

the current is perpendicular to the B-field

c)

the current is parallel to the B-field

d)

There is always a force.

9.
Two like charges
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
10.

A coin is rubbed with a cloth gains 3X10^-16 C of positve charge, How many electrons it lost. 

a)

1875

b)

18750000

c)

187500

11.
An atom loses an electron.  What type of charge does it have now?
a)
positive
b)
negative
12.
An atom gains an electron.  What type of charge does it have now?
a)
positive
b)
negative
c)
No charge
13.
What does it mean when the electric field lines are close together?
a)
the field is positive
b)
the field is negative
c)
The field is strong
d)
the field is weak
14.
Charged objects are not attracted to neutral objects
a)
True
b)
False
15.
When a balloon is rubbed on clothes it acquires a charge by ___________
a)
Induction
b)
reduction
c)
friction 
d)
concuction
16.
What do you call the process of charging a conductor by bringing it near another charged object?
a)
induction
b)
polarization
c)
neutralization
d)
conduction
17.
Which of the following is not a good conductor of electricity?
a)
copper
b)
silver
c)
Glass
d)
aluminum
18.
Which of the following is not a good insulator?
a)
Copper
b)
Glass
c)
rubber
d)
wool
19.

What is the end result of charging by contact?

a)

Both object have the same charge, so they will attract one another

b)

Both object have the same charge, so they will repel one another

c)

Both object have the opposite charge, so they will attract one another

d)

Both object have the opposite charge, so they will repel one another

20.

Which image shows a neutral conductive pith ball after a positively charged balloon is brought near the left side, but doesn't touch?

a)

A

b)

B

c)

C

d)

D

21.

Why does the child's hair stick up?

a)

The boy is grounded since he's at the bottom of the slide

b)

He gained a charge from the slide, and since he's not grounded, his hairs have the same charge so they repel one another

c)

He gained a charge from the slide, and since he's not grounded, his hairs have opposite charges so they repel one another

d)

When hair is neutral, some have a positive side and some have negative side, so they will attract to each other, making it stand up

22.

A balloon is rubbed against a student's hair and then touched to a wall. The balloon sticks to the wall due to

a)

The balloon is charged neutral, so is the wall, so it attracts to the wall

b)

The balloon is charged opposite the wall, so it attracts to the wall

c)

The balloon has a charge, so it attracts the neutral wall

d)

The wall grounds the balloon, so it sticks

23.

Two like charges

a)

neutralize each other.

b)

repel each other.

c)

must be neutrons.

d)

attract each other.

24.

Which of the following labeled points is in the region with the strongest force of electric charge

a)

A

b)

B

c)

C

d)

D

25.

When the distance between two charges is halved, the electrical force between the charges

a)

quadruples

b)

reduces to one fourth

c)

halves

d)

doubles

26.
Electric charge is neither created nor destroyed, but can be rearranged.
a)
true
b)
false
27.

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

a)

the plastic strip acquired extra protons from the cotton.

b)

the plastic strip acquired extra protons from the charging process

c)

protons were created as the result of the charging process

d)

the plastic strip lost electrons to the cotton during the charging process

28.

Two similar metal spheres, A and B, have charges of +2.0 x 10-6 coulomb and +1.0 x 10-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

a)

2.0N

b)

4.0N

c)

8.0N

d)

1.0N

29.

which is the field for opposite charges

a)
b)
c)
d)
30.

2 charged objects both feel a force of 200 N. If q1 becomes 3 times bigger, what is the new force

a)

203

b)

600

c)

66.7

d)

1800

31.

2 charges are 20 cm apart and feel a force of 500 N. if the distance between them becomes 60 cm, what is the new force

a)

4500

b)

540

c)

1500

d)

55.6

32.

2 charges feel a force of 40 N. if we cut the distance between them in half, what is the new force they feel

a)

20

b)

80

c)

160

d)

10

33.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
34.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
35.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
36.
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
a)
Clockwise
b)
Counter-clockwise
c)
It will not move
d)
Need more information
37.
An electromagnet's poles may be reversed by:
a)
decreasing the voltage of the coil
b)
increasing the number of coils
c)
changing the direction of current flow
d)
altering the material used to make the coils
38.
In un-magnetized materials the domains are __________ aligned.
a)
super
b)
slightly
c)
randomly
d)
always
39.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
40.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
41.

If a glass plate is placed over a magnet and iron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?

a)

The magnetic field

b)

The electrostatic field

c)

The piezoelectric effect

d)

The chemical reaction of the magnet and the filings

42.
What will happen when these magnets are brought close together?
a)
They will attract each other.
b)
They will repel each other.
c)
Both magnets will turn to the left
d)
Both magnets will turn to the right
43.
A simple electromagnet can be made with which of the following?
a)
an electric current
b)
a turbine and nail
c)
a nail, a wire, and a battery
d)
a compass and a battery
44.

Iron, Nickel and cobalt are all __________________ materials

a)

Diamagnetic

b)

Ferromagnetic

c)

Paramagnetic

d)

Temporary magnet

45.

It is the substances that are SLIGHTLY attracted by strong magnets.

a)

Diamagnetic

b)

Ferromagnetic

c)

Magnetism

d)

Paramagnetic

46.

Which of these is STRONGLY attracted to a magnet?

a)

Aluminum

b)

Bismuth

c)

Iron

d)

Wood

47.

It is the process of removing the magnetic property of a magnet.

a)

Demagnetization

b)

Magnetic Field

c)

Magnetism

d)

Magnetization

48.

How is a permanent magnet DIFFERENT from a temporary magnet?

a)

A permanent magnet attracts materials made of iron.

b)

A permanent magnet has a magnetic field.

c)

A permanent magnet has poles.

d)

A permanent magnet keeps its magnetism for a long time.

49.

It refers to the properties and interactions of magnets.

a)

Demagnetization

b)

Magnetism

c)

Magnetization

d)

Natural Magnet

50.

Which of these is STRONGLY attracted to a magnet?

a)

Aluminum

b)

Bismuth

c)

Iron

d)

Wood

51.

It is the process of removing the magnetic property of a magnet.

a)

Demagnetization

b)

Magnetic Field

c)

Magnetism

d)

Magnetization

52.

What does the thumb indicate in flemings left hand rule?

a)

Force

b)

Motion

c)

Current

d)

Magnetic field direction

53.

What direction is the force/motion in the following diagram?

a)

Perpendicular to the magnets

b)

Downwards

c)

Parallel and through the magnets

54.

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

a)

180

b)

45

c)

90

d)

270

55.

Which rule can be used to work out which way a coil of wire rotates in a motor?

a)

Fleming's left-hand rule

b)

Fleming's right-hand rule

56.

How does a split ring commutator work?

a)

Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

b)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

c)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

57.

Which action will increase the deflection of the galvanometer pointer?

a)

The magnetic pole is reversed

b)

The number of turns of coils is increased

c)

The coil is made from insulated wire

d)

The magnet is slowly pushed into the coil

58.
The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?
a)
Flip the magnet around so the North pole is facing out
b)
Move the magnet back and forth
c)
Take the magnet out
d)
Add more coils around the paper cylinder
59.

A voltage is created in a wire when...

a)

it cuts through magnetic field lines

b)

it moves parallel to magnetic field lines

c)

it is stationary in a magnetic field

d)

a wire moves anywhere

60.

Main difference between the motor effect and EM induction

a)

Motor effect: current + magnetic field = motion

Induction: motion + magnetic field = current

b)

Motor effect: current + motion = magnetic field

Induction: motion + magnetic field = current

c)

Motor effect: current + motion = magnetic field

Induction: motion + magnetic field = no effect

61.
The current in the green wire flows from the left to the right. What direction does the wire move?
a)
Up 
b)
Down
c)
Into the page
d)
Out of the page
62.

The diagram show the direction of magnetic field, B and current, I.

By using Fleming left hand rules, determine the direction of Magnetic force, F.

a)

no force produced

b)

downward

c)

into the page

d)

out from the page

63.

The diagram show the direction of magnetic field,B. The current is going into the page.

By using Fleming left hand rules, determine the direction of Magnetic force, F.

a)

no force produced

b)

right

c)

into the page

d)

out from the page

64.

For the motor effect, there must be some form of power source

a)

True

b)

False

65.
While electric current is flowing through a wire, what surrounds the wire?
a)
a magnetic field
b)
a glowing light
c)
neutrons
d)
protons
66.
How could the experimenter increase the amount of electricity being induced by this experiment?
a)
Increase the number of coils
b)
Decrease the number of coils
c)
Flip the magnet around
d)
Nothing, the amount of electricity cannot be increased
67.

Name one factor that does not affect the size of a force in on a current-carrying conductor placed in a magnetic field?

a)

Gravity

b)

Magnetic flux density/size of magnetic field

c)

Size of the current

d)

Length of the conductor

68.

A 20 cm section of wire with a current of 8 A is at 90 degrees to a 0.1 T magnetic field. What direction is the force and calculate the size of it? F = BIlF\ =\ BIl  

a)

up, 0.1 x 8 A x 20 cm = 16 N

b)

down, 0.1 x 8 A x 20 cm = 16 N

c)

down, 0.1 x 8 A x 0.20 m = 0.16 N

d)

up, 0.1 x 8 A x 0.20 m = 0.16 N

69.

Which rule can be used to work out which way a coil of wire rotates in a motor?

a)

Fleming's left-hand rule

b)

Fleming's right-hand rule

70.

How does a split ring commutator work?

a)

Swaps the contact evert full turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

b)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil do not experience a force in the same direction.

c)

Swaps the contact evert half turn, so that the left-hand and right-hand arms of the coil always experience a force in the same direction.

71.

The working principle og AC generator is

a)
Electro motive force 
b)
Electromagnetic induction 
c)
generator energy conversion 
d)
induced voltage
72.

The voltage induced in a conductor is ___________ ___________ to the rate which the conductor cuts the magnetic lines of force.

a)

inversely proportional

b)

directly proportional

c)

negatively coorelated

d)

absolutely opposite

73.

How is contact between the coil and circuit maintained in an AC generator?

a)

A split ring commutator connects to each side for half a turn

b)

It cannot be maintained.

c)

The alternator can only complete one revolution and must then be rotated in reverse

d)

Slip rings and brushes allow continuous connection

74.

A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope.


Which graph shows the output voltage V against time t?

a)
b)
c)
d)
75.

If the coil is placed perpendicular to field lines then the number of lines passing through the coil is:

a)

Minimum

b)

Maximum

c)

Zero

d)

May be maximum or minimum

76.

AC generator converts:

a)

Mechanical energy to electrical energy

b)

Electrical energy to mechanical energy

c)

Heat energy to mechanical energy

d)

Chemical energy to electrical energy

77.

The direction of induced emf or current is indicated by:

a)

Fleming’s left-hand rule

b)

Fleming’s right-hand rule

c)

Faraday’s law of electromagnetic induction

d)

Ampere’s swimming rule

78.

When a coil is held stationary in magnetic field, the induced current in it:

a)

continuously changes

b)

randomly changes

c)

remains zero

d)

becomes maximum

79.

Which type of current is flowing ?

a)

Alternating current

b)

Direct current

c)

Both

d)

None

80.

Name the device

a)

DC motor

b)

DC generator

c)

AC generator

d)

None of the above

81.

Name the Device and type of current as indicated by waveform

a)

DC generator ,DC

b)

DC motor , AC

c)

AC Generator , AC

d)

AC Generator , DC

82.
Which of these is NOT a part of a DC Generator.
a)
Slip rings
b)
commutator 
c)
brushes
d)
stator
83.
Which is the device in DC Generators that converts AC current into DC current
a)
brushes
b)
commutator 
c)
stator
d)
armature
84.
AC generators have 
a)
2 slip rings 
b)
1 slip ring 
c)
3 slip rings 
d)
4 slip rings
85.

Graph P represents the output emf of an AC generator. Graph Q is the output emf after a change has been made using the same generator. Which one of the following changes has been made to the generator to produce graph Q?

a)

The number of turns of the coil has been doubled

b)

The surface area of the coil has been doubled

c)

The speed of rotation has been doubled

d)

The strength of the magnetic field has been doubled

86.

The graph shows the output of an a.c. generator. The coil in the generator rotates 20 times in one second.


Which graph shows the output when the coil rotates 10 times in one second?

a)
b)
c)
d)
87.

Select the correct voltage graph for a DC dynamo.

a)
b)
c)
d)
88.
The process of generating the current in a conductor is called as 
a)
Electro motive force 
b)
Electromagnetic induction 
c)
generator energy conversion 
d)
induced voltage
89.

Which ONE of the following changes may lead to an increase in the emf of an AC generator without changing its frequency?

a)

Decrease the resistance of the coil.

b)

Increase the area of the coil.

c)

Increase the resistance of the coil.

d)

Decrease the speed of rotation.

90.

In order for electromagnetic induction to occur, you need...

a)

a conductor

b)

a magnetic field

c)

relative motion

d)

all three

91.

When a coil is held stationary in magnetic field, the induced current in it:

a)

continuously changes

b)

randomly changes

c)

remains zero

d)

becomes maximum

92.

What is true of AC GENERATOR?

a)

It works on the principle of electromagnetic induction

b)

The mechanical energy of the rotation is converted into electrical energy

c)

A pair of slip rings are used in the AC generator

d)

All the above

93.

What does the index finger show you in the Fleming’s right-hand rule?

a)

Direction of current

b)

Motion of wire

c)

Direction of electric field

d)

Direction of magnetic field

94.

In a generator armature makes one full revolution, it goes through ………….. degrees of mechanical rotation.

a)

0

b)

90

c)

270

d)

360

95.

The AC voltage waveform is in the positive direction for some period of time and in the negative direction for some period of time. What is the name given to this waveform?

a)

Alternating wave

b)

Inverted wave

c)

Hertz wave

d)

sine wave

96.

The electricity generated from the power plant is ……

a)

Alternating Current

b)

Direct Current

c)

Delayed Current

d)

Eddy Current

97.

What is voltage?

a)

the amount of push the electrical source supplies to the circuit

b)

how much a given device resists the flow of electric current

c)

flow of electric charge

d)

none of the above

98.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
99.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
100.
What word means how much energy is given to / removed from the electrons.
a)
Current
b)
Voltage
c)
Resistance
d)
Power
101.
What is voltage measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
102.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
103.

Voltage divided by Current

(V / I)

a)

Current

b)

Power

c)

Resistance

d)

Watts

104.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

105.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
106.

Which graph is for a diode?

a)

Graph C

b)

None of the graphs

c)

Graph B

d)

Graph A

107.

Which graphs follow Ohm's law?

a)

Graph B only

b)

Graph A and C only

c)

Graph A only

d)

None of the graphs

108.

Select all that apply. A diode is a...

a)

Ohmic component

b)

Non-ohmic component

c)

Component that allows current to flow in both directions.

d)

Component that allows current to flow in one direction only.

109.

This graph is for a filament lamp. What is the reason for the shape of the line shown on the graph?

a)

Filament lamps are variable resistors. So we can use a sliding scale to change their resistance, which will change the current going through them.

b)

Filament lamps cool down when current runs through them, their resistance increases causing the current to decrease over time.

c)

Filament lamps heat up as current runs through them, this increases resistance causing the current to decrease over time.

d)

Filament lamps heat up as current runs through them, this increases resistance causing the current to increase over time.

110.

Which statement fully describes the graph shown.

a)

As current increases voltage decreases (inversely proportional). This graph does not follow Ohm's law, it is for a non-ohmic component.

b)

As voltage increases current increases (directly proportional). This graph follows Ohm's law, it is for a non-ohmic component.

c)

As voltage decreases current increases (inversely proportional). This graph does not follow Ohm's law, it is for an ohmic component.

d)

As voltage increases current increases (directly proportional). This graph follows Ohm's law, it is for an ohmic component.

111.

Ohm's law is the relationship between...

a)

Circuits, switches and resistors

b)

Voltage, Amps and Circuits

c)

Amps, Ohms and Volts

d)

Voltage, Current and Resistance

112.

A 3-V battery sends a current of 0.10 A through a light bulb. What is the resistance of the filament of the bulb?

a)

.033 Ω

b)

30 Ω

c)

.3 Ω

d)

300 Ω

113.
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
114.
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
115.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
116.
What is the total resistance (RT) across this circuit?
a)
3 kΩ
b)
10 kΩ
c)
13 kΩ
d)

18 kΩ

117.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
118.
What is a switch's function in a circuit?
a)
to make the current hotter or colder
b)
turn on and off the flow of current
c)
the pathway that current flows
d)
to add more power to the circuit
119.
this circuit is .....?
a)
open
b)
parallel
c)
closed
d)
The cutest little circuit evah!
120.
When all parts of the circuit are connected it is a ______ circuit. 
a)
open
b)
closed
121.

How many lightbulbs will work if there is a break in the circuit at POINT A?

a)

1

b)

2

c)

3

d)

NONE

122.

The current going through the 90 ohm resistor is

a)

10 amps

b)

0.1 amps

c)

0.2 amps

123.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
124.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

125.

Why is electrical wiring usually are covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

126.

What is a circuit with several paths for electricity to flow?

a)

conductor

b)

series circuit

c)

parallel circuit

d)

open circuit

127.

What is a circuit that only has ONE path for electricity to flow?

a)

series circuit

b)

closed circuit

c)

parallel circuit

d)

light bulb

128.
This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -
a)
the switch gives energy to the battery
b)
the buzzer is made of special plastic
c)
the wires are cooled by the surrounding air
d)
electricity can flow in a complete path
129.
Will the light bulb in this circuit light and why/why not?
a)
yes, because it has two batteries
b)
no, because the switch is open
c)
yes, because it is in a circuit
d)
no, because the bulb is burned out
130.
Which copper wire has the lowest resistance?
a)
1 metre of 1 mm diameter wire
b)
0.5 metre of 1 mm diameter wire
c)
0.5 metre of 0.5 mm diameter wire
d)
1 metere of 0.5 mm diameter wire
131.
What happens to a resistor when the temperature is increased?
a)
Increases
b)
decreases
c)
stay the same
d)
vary randomly
132.
The length of a certain conductor of resistance 100 is doubled and its cross-sectional area is halved. Its new resistance is 
a)
100
b)
50
c)
200
d)
400
133.
Factor which does not affect the resistance
a)
Type of material
b)
Length of material
c)
Mass of the material
d)
Area of the material
134.
Graph shows that _____________
a)
Resistance is directly proportional to Area
b)
Resistance is inversely proportional to Area
c)
Resistance is a constant while Area changes.
d)
Area is a constant while resistance changes.
135.
which has the highest current flowing through it?
a)
R1
b)
R2
c)
R3
d)
All the same
136.

The circuit in the diagram contains two capacitors connected in parallel. What is the total capacitance of the circuit?

a)

100 μF\mu F  

b)

65 μF\mu F

c)

35 μF\mu F

d)

30 μF\mu F

137.

The circuit in the diagram contains two capacitors connected in series. The total capacitance of the circuit is 12 µF.What is the capacitance 𝐶?

a)

19 μF\mu F  

b)

21 μF\mu F

c)

16 μF\mu F

d)

13 μF\mu F

138.

The circuit in the diagram contains two capacitors connected in series. What is the total capacitance of the circuit? Answer to the nearest microfarad.

a)

46 μF\mu F

b)

109 μF\mu F

c)

94 μF\mu F  

d)

35 μF\mu F

139.

What is a capacitor?

a)

A device that resists changes in voltage

b)

A device that stores electrical energy in an electric field

c)

A device that converts electrical energy into mechanical energy

d)

A device that increases the voltage of an electrical circuit

140.

When capacitors are connected in series, how is the total capacitance CeqC_{eq} calculated?

a)

Ceq=C1+C2+C3+...C_{eq}=C_1+C_2+C_3+...

b)

Ceq=11C1+1C2+1C3+...C_{eq}=\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}

c)

Ctotal=C1⋅C2⋅C3⋅...C1+C2+C3+...C_{total} = \frac{C_1 \cdot C_2 \cdot C_3 \cdot ...}{C_1 + C_2 + C_3 + ...}

d)

Ceq=C12+C22+C32+...C_{eq}=\sqrt{C_1^2+C_2^2+C_3^2+...}

141.

6. The total capacitance of two capacitors connected in series is _____________ the lowest value capacitor

a)

equal to

b)

opposite

c)

greater than

d)

less than

142.

A 130 mF capacitor and a 150 mF capacitor are each connected across a 6 V dc source. The voltage

across the 330 pF capacitor is ?

a)

8 Volts

b)

6 Volts

c)

4 Volts

d)

2 Volts

143.
1. The resistivity of a semiconductor lies between 
a)
(a)10 -6 Ωm to10-8 Ωm
b)
n(b) 108 Ωm to1014 Ωm
c)
(c) 10 -2 Ωm to104 Ωm
d)
(d) none of these
144.
3. Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
a)
(a) Boron 
b)
Arsenic
c)
Indium
d)
Gallium
145.

Doping of Semiconductors

a)

materials which can conduct electricity better than insulator, but not as well as conductors.

b)

The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.

c)

when 4 electrons in outermost orbit.

146.

Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,

a)

np > ne in an intrinsic semiconductor, I < Ip + Ie

b)

np = ne in an extrinsic semiconductor, I > Ip + Ie

c)

np = ne in an intrinsic semiconductor, I = Ip + Ie

d)

np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie= current due to electrons, I= total current)

147.

LED is

a)

Light Enhancing Diode

b)

Light Emitting Diode

c)

Light Emitting Detector

d)

Light Enhancing Detector

148.

The energy band in which free electrons exist is know as

a)

first band

b)

second band

c)

conductive band

d)

valence band

149.

What is the most common semiconductor material used for producing integrated circuits

a)

Quartz

b)

Silicon

c)

Diamond

d)

Tantalum

150.

------------------------ is created out of two metal plates and an insulating material called a dielectric.

a)

A capacitor

b)

An inductor

c)

A fixed resistor  

d)

A variable resistor

151.

 

If C is the capacitance in Farads, ϵ permittivity of the dielectric, A area of plate overlap in square meters and d distance between plates in meters, then:

a)

C = ϵd/A

b)

C = ϵA/d

c)

C = A/ϵd

d)

C = d/ϵA

152.

How does the capacitance of a parallel plate capacitor change if the distance between the plates is increased?

a)

Decreases

b)

Becomes negative

c)

Remains the same

d)

Increases

153.

What happens to the electric field strength between the plates of a parallel plate capacitor when a dielectric material is inserted?

a)

The electric field strength increases.

b)

The electric field strength remains the same.

c)

The electric field strength becomes negative.

d)

The electric field strength decreases.

154.

Explain the role of surface area of the plates in determining the capacitance of a parallel plate capacitor.

a)

Surface area has no impact on capacitance

b)

Increasing surface area decreases capacitance

c)

Surface area affects resistance, not capacitance

d)

Surface area of the plates plays a crucial role in determining the capacitance of a parallel plate capacitor.

155.

What is the SI unit of capacitance?

a)

ohm

b)

newton

c)

farad

d)

joule

156.

What is the name of this component?

a)

battery

b)

cell

c)

open switch

d)

lamp

157.

What is the name of this component?

a)

battery

b)

bell

c)

motor

d)

lamp

158.

What is the name of this component?

a)

battery

b)

cell

c)

open switch

d)

lamp

159.

What is the name of this component?

a)

fuse

b)

cell

c)

motor

d)

lamp

160.

What is the name of this component?

a)

fuse

b)

cell

c)

motor

d)

lamp

161.

What is the name of this component?

a)

fuse

b)

cell

c)

battery

d)

wire

162.

What is the name of this component?

a)

closed switch

b)

cell

c)

open switch

d)

wire

163.

What is the name of this component?

a)

fuse

b)

cell

c)

bell

d)

lamp

164.

What is the name of this component?

a)

fuse

b)

cell

c)

wire

d)

bell

165.

What is the name of this component?

a)

fuse

b)

cell

c)

motor

d)

lamp

166.

Is this an example of a series circuit?

a)

yes

b)

no

c)

It is a parallel circuit

167.

What type of circuit is this?

a)

Series circuit

b)

Kilowatt circuit

c)

Parallel circuit

d)

potential circuit

168.

This symbol represents a ..............

a)

valve

b)

voltmeter

c)

Voltage

d)

Vacuum

169.

This symbol represents a .............

a)

Anode

b)

Alternator

c)

Amplifier

d)

Ammeter

170.

This symbol represents a ..........

a)

Bulb

b)

Battery

c)

Buzzer

d)

Microphone

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10th - 11th Grade