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LONG TEST IN GENERAL PHYSICS 2

Total questions: 60

Worksheet time: 49mins

Name
Class
Date
1.
12. If the potential of capacitor having capacity 6µF is increased from 10V to 20V, then increases in its energy will be
a)
4x10-4 J
b)
7x10-4 J
c)
9x10-4 J
d)
14x10-4 J
2.
8. Net Capacitance of three identical capacitors in series is 1 µF. What will be their net capacitance if connected in parallel ? find the ratio of energy stored in the two configurations if they are both connected in same source
a)
1/9
b)
1/12
c)
1/16
d)
1/3
3.
7. An air capacitor is given a charge of 2µc raising its potential to 200 V. if on inserting a dielectric medium its potential falls to 50 V, what is the dielectric constant of the medium?
a)
2
b)
4
c)
6
d)
8
4.
6. A 4µF is charged by a 200V supply. It is then disconnected from the supply , and is connected to another uncharged 2µF capacitor , how much electrostatics energy of the first capacitor is lost in the form of heat and electromagnetic radiation
a)
167x10-2 J
b)
36.7x10-2 J
c)
7.67x10-2 J
d)
2.67x10-2 J
5.
5. Calculate the capacitance of a parallel plate capacitor, if the area of each plate is 1m2 and the distance of separation of the plates is 1mm
a)
8.853x10-7F
b)
8.853x10-9F
c)
8.853x10-11F
d)
8.853x10-14F
6.
4. Two capacitors of capacitance 6μF , 12μF are connected in series with a battery , the voltage across the 6μF capacitor is 2V Compute the total battery voltage
a)
1V
b)
2V
c)
3V
d)
4V
7.
3. A parallel plate capacitor with air b/w plate has capacitance of 8pF , what will be the capacitance , if the distance between the plate is reduced by half and space between them is filled with substance of dielectric constant is 6
a)
16pF
b)
36pF
c)
96pF
d)
86pF
8.
2. 12pF capacitor is connected to 50V battery , How Much electrostatics energy is stored in the capacitor
a)
1.5x10-8J
b)
1.5x10-9J
c)
1.5x10-10J
d)
1.5x10-11J
e)
Option 5
9.

What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge?

a)

2F

b)

4F

c)

6F

d)

8F

10.

A dielectric is inserted into an air-filled parallel plate capacitor of capacitance 20  μ\mu  F so that only half of the space between the plates is filled as shown in the diagram above. If the dielectric constant is 5.0, what is the final capacitance of the capacitor?

a)

8.3  μ\mu  F

b)

30  μ\mu  F

c)

60  μ\mu  F

d)

100  μ\mu   F

11.

A capacitor consists of two parallel plates in which the distance between the plates can be adjusted. The capacitor is charged by connecting the capacitor to a battery, which is then removed.The potential diiference between the plates of the isolated capacitor can be increased by

a)

touching the two Plates

b)

bringing the two Plates closer

c)

separating the two plates further apart

d)

allowing the potential difference increasing by itself

12.

How much energy is stored in a 3 μF capacitor charged to 6 V?

a)

18 μJ

b)

27 μJ

c)

54 μJ

d)

108 μJ

13.

What is the capacitance in the network if two capacitors 2 μF and 3 μF are connected parallel?

a)

6 μF

b)

5 μF

c)

1.5 μF

d)

1 μF

14.

What if a Silicon Dioxide with an electric constant of 3.9 is inserted in between the plates of a 30mF capacitor? What will be the capacitance?

a)

117 mF

b)

117 F

c)

117 nF

d)

117 µF

15.

The voltage of a capacitor is decreased by a factor of 2. Which of the following CANNOT be a cause of this phenomenon?

a)

A dielectric is inserted while disconnected to the battery

b)

A dielectric is inserted while connected to the battery

c)

The area is increased while disconnected to the battery

d)

The separation distance is decreased while disconnected to the battery

16.

How much energy can be stored in 96 μF capacitor connected to a 8 V battery?

a)

30 J

b)

3 x 10-4 J

c)

3 mJ

d)

0.003 mJ

17.

How much charge can be accumulated in a 50µF capacitor connected to a 10 V battery

a)

250 µC

b)

500 µC

c)

750 µC

d)

1000 µC

18.

How do dielectrics contribute to the storage of electrical energy in capacitors?

a)

Dielectrics increase the capacitance of the capacitor.

b)

Dielectrics decrease the capacitance of the capacitor.

c)

Dielectrics have no effect on the storage of electrical energy in capacitors.

d)

Dielectrics convert electrical energy into heat in capacitors.

19.

Explain the role of dielectrics in reducing the electric field strength within capacitors.

a)

Dielectrics generate heat within capacitors and do not affect the electric field strength

b)

Dielectrics polarize in the presence of an electric field, creating an opposing field that reduces the overall field strength.

c)

Dielectrics have no effect on the electric field strength within capacitors

d)

Dielectrics increase the electric field strength within capacitors

20.

Define dielectric constant and explain its significance in the context of capacitors.

a)

The dielectric constant is a measure of a material's ability to conduct electrical energy in an electric field.

b)

The dielectric constant is a measure of a material's ability to resist electrical energy in an electric field.

c)

The dielectric constant is a measure of a material's ability to generate magnetic energy in an electric field.

d)

The dielectric constant is a measure of a material's ability to store electrical energy in an electric field.

21.

What is polarization in the context of dielectrics?

a)

The absorption of light by a dielectric material

b)

The emission of electrons from a dielectric material

c)

The generation of heat by a dielectric material

d)

Alignment of electric dipoles in response to an external electric field

22.

A. All electric filed lines generated by the charges on the plates of the capacitor can pass through the dielectric.

B. The higher the electric field lines passing through the plate capacitor, the lesser the potential difference.

a)

statement A alone is TRUE

b)

statement B alone is TRUE

c)

statements A and B are TRUE

d)

statements A and B are FALSE

23.

The capacitance of a capacitor is not affected by the orientation or geometry of the plates and the dielectric constant of the material between them

a)

TRUE

b)

FALSE

24.

A parallel plate capacitor is charged up by a battery. The battery is then disconnected, but the charge remains on the plates. The plates are then pulled apart, what will happen to the electric potential energy stored by the capacitor?

a)

Increase, because there are still charges remain on the plates

b)

No

Increase, because distance has not something to do with the potential energy

c)

Decrease, because distance is inversely proportional with the electric potential energy

d)

Decrease, because charge is inversely proportional with the electric potential energy

25.

An empty parallel plate capacitor is connected to a battery that maintains a constant potential difference between the plates. A dielectric is inserted between the plates, what will happen to the capacitance of the system?

a)

Increase, a dielectric material is used to higher the capacitance of the system.

b)

Decrease, a dielectric material is used to lower the capacitance of the system

c)

Remains the same with the value of potential difference because they are directly proportional with one another.

d)

Remains the same with the value of potential difference because capacitance is not affected by the dielectric

26.

In charging up a capacitor, a battery does work in transferring an increment of charge from one plate of the capacitor to the other plate and will be stored as an electrical potential energy in the capacitor. Which of the following statements BEST describes work?

a)

Work is the ratio of charges and potential difference that can be stowed inside the metal plate capacitors

b)

Work is affected by the geometry of the plates and other factors such as dielectric constant of the material between them

c)

Work is the density of energy that can be stored inside the capacitor

d)

Work is equal to the product of the charge increment and the potential difference between the plates.

27.

Calculate the electric flux when a 1,650 N/C electric field passes through a square sheet of paper of side 13.0 cm. The electric field is parallel to the area vector of the paper.

a)

27.9 Nm2C27.9\ \frac{Nm^2}{C}

b)

215 Nm2C215\ \frac{Nm^2}{C}

c)

12 700 Nm2C12\ 700\ \frac{Nm^2}{C}

d)

0 Nm2C0\ \frac{Nm^2}{C}

28.

A uniform electric field of 250 N/C passes through a thin sheet of paper of area 0.077 m^2, making an angle of 60 degrees with the plane of the paper. What is the electric flux?

a)

1 600 Nm2C1\ 600\ \frac{Nm^2}{C}

b)

2 800 Nm2C2\ 800\ \frac{Nm^2}{C}

c)

17 Nm2C17\ \frac{Nm^2}{C}

d)

9.6 Nm2C9.6\ \frac{Nm^2}{C}

29.

If a surface has an area of 2 m² and is perpendicular to an electric field of 50 N/C, what is the electric flux?

a)

50 Nm²/C

b)

25 Nm²/C

c)

100 Nm²/C

d)

0 Nm²/C

30.
A cylindrical wastepaper basket with a 0.15-m radius opening is in a uniform electric field of 300 N/C, perpendicular to the opening. The total flux through the sides and bottom is: 
a)
0 N×m2/C
b)
4.2 N×m2/C
c)
21 N×m2/C
d)
280 N×m2/C
31.

The formula to solve the electric flux is:

a)

Electric flux is equal to Electric Field over Area of the surface subtracted to cosine theta.

b)

Electric flux is equal to cosine theta over Electric field multiplied by Area of the surface

c)

Electric flux is equal to Area of the surface multiplied by cosine theta over Electric field.

d)

Electric flux is equal to Electric field multiplied by Area of the surface times cosine theta.

32.

The area vector for a flat surface

a)

is parallel to the surface and has a magnitude equal to the length of a side of the surface.

b)

is parallel to the surface and has a magnitude equal to the area of the surface.

c)

is perpendicular to the surface and has a magnitude equal to the length of a side of the surface.

d)

is perpendicular to the surface and has a magnitude equal to the area of the surface.

33.

The electric flux Φ through a surface

a)

is the amount of electric field piercing the surface.

b)

does not depend on the area involved.

c)

is the electric field multiplied by the area.

d)

is the line integral of the electric field around the edge of the surface

34.

A 5 C and 8 C charge give off a force of 2.5 x 109 N. What is the distance between them?

a)

11 m

b)

12 m

c)

121 m

d)

144 m

35.

A 5 C and 8 C charge give off a force of 2.5 x 109 N. What is the distance between them?

a)

11 m

b)

12 m

c)

121 m

d)

144 m

36.

In which direction will the electric force from the two equal positive charges move the negative charge shown below?

a)

To the North

b)

To the South

c)

To the South-West

d)

To the West

e)

To the North-West

37.

A typical lightning bolt has about 10.0 C of charge. How many excess electrons are in a typical lightning bolt?

a)

6 x 1019

b)

6 x 10-19

c)

6 x 1031

d)

6 x 10-31

38.
Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?
a)
A is positive and B is positive.
b)
A is negative and B is positive.
c)
A is positive and B is negative.
d)
A is negative and B is negative.
39.

Two charges of equal magnitude give off a force of -441000 N when they are 1000 m away from each other. What are the charges magnitude?

a)

5

b)

7

c)

9

d)

11

40.

A 5 C and 8 C charge give off a force of 2.5 x 109 N. What is the distance between them?

a)

11 m

b)

12 m

c)

121 m

d)

144 m

41.
Two charges separated by a distance of 1 meter exert a 20-N force on each other. If the charges are pulled to a 2 meter separation distance, the force on each charge will be 
a)
10 N
b)
5 N
c)
2.5 N
d)
40 N
42.

Charge Q is kept in a sphere of 5 cm first than it is kept in a cube of side 5 cm. the outgoing flux will be-

a)

More in case of sphere

b)

More in case of cube

c)

Same in both cases

d)

None of the above

43.

1. Two charges 3x 10−510^{-5}  C and 5x 10410^4   C are placed at a distance 10 cm from each other. Find the value of electrostatic force acting between them.

a)

 13.5×101113.5\times10^{11} N 

b)

 40 × 101140\ \times\ 10^{11^{ }}  

c)

 180×109180\times10^9  

d)

 13.5×101013.5\times10^{10}  

44.

When electricity moves through a metal wire, the wire is

a)

Conductor

b)

Insulator

c)

Generator

d)

Circuit

45.
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
46.

Discuss the similarities and differences between gravitational force and electric force.

a)

Gravitational force is stronger than electric force

b)

Gravitational force and electric force are the same force

c)

Gravitational force and electric force are similar in following an inverse square law but differ in the types of objects they act on and the possibility of repulsion.

d)

Gravitational force is attractive while electric force is repulsive

47.

How does the magnitude of charge affect the electric force between two charges?

a)

The electric force between two charges is inversely proportional to the magnitude of the charges.

b)

The electric force between two charges is not affected by the magnitude of the charges.

c)

The electric force between two charges is proportional to the square of the magnitudes of the charges.

d)

The electric force between two charges is directly proportional to the product of the magnitudes of the charges.

48.

Explain the concept of an electric field.

a)

An electric field is a type of magnetic field

b)

An electric field is a region around a charged object where another charged object experiences a force.

c)

An electric field is not affected by the presence of other charges

d)

An electric field is only present in insulators

49.

How does the distance between two charges affect the electric force between them?

a)

The electric force becomes repulsive instead of attractive as the distance between two charges increases.

b)

The electric force remains constant regardless of the distance between two charges.

c)

The electric force decreases as the distance between two charges increases.

d)

The electric force increases as the distance between two charges increases.

50.

What is the formula for calculating the electric force between two charges?

a)

F = k * q1 / r^2

b)

F = k * q1 * q2 / r^2

c)

F = k * |q1 * q2| / r^2

d)

F = q1 * q2 / r^2

51.

How does Coulomb's Law describe the force between two charged objects?

a)

The force between two charged objects is described by Coulomb's Law as directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

b)

The force between two charged objects is described by Coulomb's Law as directly proportional to the sum of their charges.

c)

Coulomb's Law states that the force between two charged objects is inversely proportional to the product of their charges.

d)

The force between two charged objects is described by Coulomb's Law as directly proportional to the square of the distance between them.

52.

Define electric charge.

a)

Electric charge is a unit of currency used in electricity bills

b)

Electric charge is a type of magnetic field

c)

Electric charge is a physical property of matter that causes it to experience a force when placed in an electromagnetic field.

d)

Electric charge is a type of battery power

53.

State Coulomb's Law.

a)

The force between charged objects is directly proportional to the square of the distance between them

b)

The force between charged objects is directly proportional to the distance between them

c)

The force between charged objects is inversely proportional to the product of their charges

d)

The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between their centers.

54.
Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?
a)
The balloons will repel each other.
b)
The balloons will attract each other.
c)
The balloons will become positively (+) charged.
d)
The balloons will pop.
55.

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

a)

protons

b)

neutrons

c)

electrons

d)

the nucleus

56.

These are materials that resist charges

a)

Conductors

b)

Insulators

c)

Semiconductors

d)

Superconductors

57.

What is the unit of measurement for charges?

a)

Farad

b)

Watts

c)

Coulombs

d)

Newton

58.

A capacitor which has a capacitance of 1 farad will

a)

be fully charged in 1 second by a current of 1 ampere

b)

store 1 coulomb of charge at a potential difference of 1 volt

c)

gain 1 joule of energy when 1 coulomb of charge is stored on it.

d)

discharged in 1 second when connected across a resistor of resistance 1 ohm.

59.
a)

Battery

b)

Cell

c)

Capacitor

d)

Resistor

60.
a)

Battery

b)

Cell

c)

Capacitor

d)

Resistor

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