Free Printable SP025 - Chapter 2 Theory

1.

Which of the following statement is FALSE about capacitance?

a)

It is a vector quantity.

b)

Capacitance is always positive.

c)

It is the ratio of charge on either plate, to the potential difference between them.

d)

The unit of capacitance is C V^-1

2.

Which statement is FALSE about surface charge density, σ?

a)

It is defined as the amount of charge per area.

b)

It is a scalar quantity with unit C m^-2.

c)

It is used to calculate the electric field strength in a parallel-plate capacitor.

d)

It is known as stress with the formula F/A.

3.

In the formula $C=\frac{\epsilon A}{d}$ , ε refers to:

a)

The permittivity of dielectric material.

b)

The dielectric constant, ε_r

c)

The strain of material.

d)

Electromotive force.

4.

Which of the following is NOT a use of capacitors?

a)

Convert electrical energy to heat energy.

b)

Smoothing of alternating current, AC.

c)

Storing electrical energy.

d)

Blocking direct current, DC from flowing through to reach a loudspeaker.

5.

What is the meaning of 1 Farad, 1F?

a)

1F is the charge of 1C stored on each conducting plates as a result of potential difference 1V between two plates.

b)

1F is the measure of temperature, which is equivalent to -17.2^oC in a capacitor.

c)

It is the force of 1N stored on one conducting plate to push 1C of electrons to another plate.

d)

It is 1 * Faraday Constant, which is equivalent to the total amount of charge of 1 mole of electrons.

6.

When two capacitors are connected in series, the effective capacitance is:

a)

$C_{eff}=\frac{1}{C_1}+\frac{1}{C_2}$

b)

$\frac{1}{C_{eff}}=\frac{1}{C_1}+\frac{1}{C_2}$

c)

$C_{eff}=C_1+C_2$

d)

$C_{eff}=\frac{1}{C_1+C_2}$

7.

When two capacitors are connected in parallel, the effective capacitance is:

a)

$C_{eff}=\frac{1}{C_1}+\frac{1}{C_2}$

b)

$\frac{1}{C_{eff}}=\frac{1}{C_1}+\frac{1}{C_2}$

c)

$C_{eff}=C_1+C_2$

d)

$C_{eff}=\frac{1}{C_1+C_2}$

8.

When two capacitors are arranged in series, the total charge, Q on each capacitor is (i), whereas when the arrangement is in parallel, the total charge, Q on each capacitor is (ii).

a)

(i) the same

(ii) the same

b)

(i) the same

(ii) different

c)

(i) different

(ii) the same

d)

(i) different

(ii) different

9.

Which of the following formula is FALSE about energy stored in a capacitor, U?

a)

$U=\frac{1}{2}\frac{Q^2}{C}$

b)

$U=\frac{1}{2\ }QV$

c)

$U=\frac{1}{2}CV^2$

d)

$U=\frac{1}{2}\left(\frac{kQq}{r}\right)$

10.

From the formula $U=\frac{1}{2}CV^2$ , if the separation between both parallel plates is doubled, the new energy stored, U' equals to:

a)

U

b)

2U

c)

0.5U

d)

4U

11.

Which of the following is FALSE about time constant, ԏ?

a)

ԏ = RC

b)

The unit of ԏ is seconds.

c)

It is a measure of how quickly the capacitor charges or discharges.

d)

ԏ is a vector quantity.

12.

During the charging process, time constant, ԏ is defined as the time required for a capacitor to reach (i) of its maximum charge or voltage. It is also the time required for the current to drop to (ii) of its initial value.

a)

(i) 37.0%

(ii) 63.0%

b)

(i) 67.0%

(ii) 33.0%

c)

(i) 63.0%

(ii) 37.0%

d)

(i) 33.0%

(ii) 67.0%

13.

Which equation is FAULTY to determine the dielectric constant, ε_r or κ?

a)

$\epsilon\ _r=\frac{C}{C_0}$

b)

$\epsilon_r=\frac{\epsilon}{\epsilon_0}$

c)

$\epsilon_r=\frac{E_0}{E}$

d)

$\epsilon_r=\frac{V}{V_0}$

14.

Based on the diagram, the effective capacitance of the setup at the left is equal to the setup at the right.

a)

TRUE

b)

FALSE

15.

Based on the diagram, the effective capacitance of the setup at the left is equal to the setup at the right.

a)

TRUE

b)

FALSE

16.

"When a piece of dielectric is inserted between two plates initially separated by vacuum, the capacitance increases."

Which of the following is the reason for this statement?

a)

The piece of dielectric increases the number of charges accumulated on both plates.

b)

The piece of dielectric weakens the electric field strength which reduces the potential difference across plates. So, the ratio of charge to potential difference increases.

c)

The piece of dielectric itself stores some positive and negative charges in it.

d)

The piece of dielectric is able to generate positive and negative charges during the discharge of the capacitor.

SP025 - Chapter 2 Theory

Total questions: 16

Worksheet time: 32mins

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