Free Printable Chapter 1+2 (Physics) Class 12

Worksheets

Chapter 1+2 (Physics) Class 12

Total questions: 35

Worksheet time: 26mins

Name

Class

Date

Which procedure below will increase the capacitance of a parallel-plate capacitor?

Increase the distance of separation between the two plates

Reduce the surface area of the plate

Insert an insulator between the two plates

Insert a conductor between the two plates

A parallel-plate capacitor is charged and then disconnected from the supply. Which of the following will increase the capacitance of the capacitor?

Reduce the area of the plates

Move the plates closer to each other

Insert a conductor between the plates of the capacitor

Increase the potential difference across the capacitor

An air-filled capacitor C consists of two parallel plates, each of area A and separated by a distance d. A dielectric with relative permittivity 5 is then inserted between the two plates. What is the new capacitance of the capacitor?

$\frac{1}{5}C$

$\frac{1}{25}C$

25C

A capacitor is charged by a constant current of 4.0 mA for 0.80 s. If the potential difference across the capacitor is 320 V, what is the capacitance of the capacitor?

5.0 $\mu F$

10 $\mu F$

13 $\mu F$

32 $\mu F$

A parallel-plate capacitor of cross-sectional area A is connected across a battery of potential difference V. A dielectric is then inserted into the capacitor. If the relative permittivity of the dielectric is 2.5 and the distance of separation between the plates is 0.050 mm, calculate the ratio of charge on the capacitor without the dielectric to the charge on the capacitor with dielectric.

2:5

5:2

1:4

1:2

A capacitor is connected in series with a light bulb and a voltage supply as shown in the diagram. If a dielectric is inserted between the parallel plates of the capacitor, which statement is not true about the capacitor?

The potential difference across the capacitor remains constant.

The electric field strength between the plates increases at the moment the dielectric is inserted.

The charge on the capacitor increases.

The capacitance of the capacitor increases.

Two capacitors of capacitance 3 $\mu F$ and 2 $\mu F$ are connected in series with the battery as shown in the diagram. If $V_1$ and $V_2$ are the potential difference across the capacitors of 3 $\mu F$ and 2 $\mu F$ respectively, what is the ratio of $\frac{V_1}{V_2}$ ?

3:2

3:1

2:1

2:3

A capacitor of capacitance 60 pF is charged to a potential difference of 400 v. Calculate the energy stored in the capacitor.

4.8 $\times10^{-6\ }$ J

3.4 $\times10^{-6\ }$ J

6.0 $\times10^{-7}$ J

2.0 $\times10^{-7}$ J

The net force due to different charges around a single charge can be determined using superposition principle. True or False?

True

False

10.

According to Coulomb's Law, The greater the separation distance between two charges the greater the magnitude of the electric force. True or False?

True

False

11.

Which of the following charges is the best example of 'Charged is Quantized'?

2.1nC

3.0µC

2.75µC

3333.1µC

12.

The electric field lines for a positive charge is always directed away from the charge. True or False?

True

False

13.

The S.I. unit for electric field is__________?

μC

n/C

N/m

none of the above

14.

Electric charges are created ______.

by gravitational forces.

separately.

between 2 oppositely charged objects.

by neutrons.

15.

How can a neutral object become charged?

by being dipped in water

by being stuck to the desk with tape

by allowing gravity to work on it

by having electrons added or removed

16.

Which statement best describes the electric fields in the image?

The charges are neutral.

Both charges are negative, so the field lines are alike.

The field lines move toward a positive charge and away from a negative charge.

The field lines move away from a positive charge and toward a negative charge.

17.

Where can an electric field be found?

below a force field

in a gravitational field

in the space surrounding a charged object

outside of a magnetic field

18.

If I triple the value of charge of a test charge the electric field will

Increase by 3

Increase by 9

Not change

Decrease by 9

19.

1 Volt is equivalent to what units?

1 N/C

1 kgm/s

1 J/C

1 N/m

20.

Suppose the magnitude of a charge placed in a field were doubled.
How much would the electric potential energy change?

Double

Decrease by 1/2

No effect

21.

What is the fundamental rule for electrostatics?

like charges repel and opposites attract

positive charge fields point away from a charge; negative points toward

charges cannot be created nor destroyed, only transferred

22.

What is the voltage across the plates of the capacitor if the capacitance is 10 µF and the Charge stored is 30 µC?

0.333 V

3 V

300 V

23.

The capacitance of a parallel-plate capacitor is:

proportional to the plate area

independent of any material inserted between the plates

proportional to the charge stored

proportional to the potential difference of the plates

24.

which of the following is symbol of capacitor ?

25.

Capacitance is measured in___________

Coulombs

Farads

Volts

26.

The insulating layer of a capacitor is called the

plate

conductors

dielectric

terminals

27.

An electric dipole is placed inside a hollow sphere at its center. Then,

the electric flux through the sphere is zero.

the electric field is zero at every point on the surface of the sphere.

the electric field is non-zero at every point on the surface of sphere.

none of these.

28.

The magnitude of electric potential is ______ at an infinite distance.

negative infinity

positive infinity

200

29.

A woman's hair stands out when she is in contact with a charged Van de Graaff generator. The reason her hair stands out is because

hair strands are at a high voltage.

she is in a strong electric field.

like charges repel.

hair is a good conductor.

30.

How much potential energy is stored in a system of charges that consists of 3 charges, each with charge $+Q$ placed at the corners of an equilateral triangle of side length $d$ ?

$\frac{1}{4\pi\epsilon_0}\ \frac{Q}{d}$

$\frac{1}{4\pi\epsilon_0}\ \frac{2Q}{d}$

$\frac{1}{4\pi\epsilon_0}\ \frac{3Q}{d}$

$\frac{1}{4\pi\epsilon_0}\ \frac{4Q}{d}$

31.

A positive charge $+Q$ is placed a distance $d$ from a negative charge $-Q$ . Note these charges have the same magnitude but different sign. Which of the following is true about the electric field and the electric potential at a point midway between the two charges?

The electric field is zero and the electric potential is zero

The electric field is not zero and the electric potential is zero

The electric field is zero and the electric potential is not zero

The electric field is not zero and the electric potential is not zero

32.

These form a surface where the electric potential is constant everywhere on the surface.

Gaussian surface

Flux surface

Equipotential lines

Equatorial lines

33.

An electron is placed on an equipotential surface of 20 V. On one side of this surface there is another equipotential surface of 16 V and on the other side there is an equipotential surface of 24 V. Towards which equipotential line will the electron move towards?

Towards the 16 V line

Towards the 24 V line

Perpendicular to the page

The electron will not move since there's an equal potential difference on both sides

34.

Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have

The same charge on each

The same energy

The same potential

The same field on their surfaces

35.

Inside a hollow charged spherical conductor, the potential

Varies directly as the distance from the centre

Varies inversely as the distance from the centre

Varies inversely as the square of the distance from the centre

Is constant

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Chapter 1+2 (Physics) Class 12

Total questions: 35

Worksheet time: 26mins

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