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1.

Two condensers of capacity 0.3 $\mu$ F and 0.6 F respectively are connected in series. The combination is connected across a potential of 6 Volts. The ratio of energies stored by the condensers will be

a)

1/2

b)

2

c)

1/4

d)

4

2.

Two condensers of capacity 0.3 $\mu$ F and 0.6 F respectively are connected in series. The combination is connected across a potential of 6 Volts. The ratio of energies stored by the condensers will be

a)

1/2

b)

2

c)

1/4

d)

4

3.

Capacitor is a device used to__________

a)

store electrical energy

b)

vary the resistance

c)

store magnetic energy

d)

dissipate energy

4.

The capacitance between two plates increases with

a)

Shorter plate area and higher applied voltage

b)

Shorter play area and shorter distance between them

c)

Larger plate area, longer distance between plates and higher applied voltage

d)

Larger plate area and shorter distance between plates

5.

In a variable capacitor, capacitance can be varied by ______

a)

Turning the rotatable plates in or out

b)

Sliding the rotatable plates

c)

Changing the plates

d)

Changing the material of plates

6.

What is the color for the numerical value of 2 on a resistor?

a)

brown

b)

black

c)

orange

d)

red

7.

What are the color codes for a 470k ohm resistor?

a)

Yellow, Violet, Yellow

b)

Orange, Grey, Orange

c)

Yellow, Violet, Orange

d)

Orange, Grey, Yellow

8.

Which resistor will prevent the most current flow?

a)

1 ohm

b)

100 ohms

c)

1000 ohms

d)

0.5k ohms

9.

What are rheostats used for?

a)

Control large amounts of heat

b)

Vary large amounts of current

c)

Control of a circuit's power rating

d)

Vary a circuit's tolerance

10.

Electromagnetic induction is change in ___________________.

a)

surface area

b)

magnetic poles

c)

magnetic flux

11.

A magnet can move in a coil of wire to produce electricity in which system?

a)

Generator

b)

Motor

c)

Magnet

d)

Transformer

12.

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

13.

Passing a current through a solenoid will produce

a)

a magnetic field

b)

an electric field

c)

a current field

d)

nothing is produced

14.

All of the following have the same units except:

a)

inductance.

b)

capacitive reactance.

c)

impedance.

d)

resistance.

15.

A resistor is connected to an AC power supply. On this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers

16.

A pure inductor is connected to an AC power supply. In this circuit, the current

a)

leads the voltage by 90°.

b)

lags the voltage by 90°.

c)

is in phase with the voltage.

d)

none of the given answers.

17.

If the frequency of the AC voltage across an inductor is doubled, the inductive reactance of that inductor

a)

increases to 4 times its original value.

b)

increases to twice its original value.

c)

decreases to one-half its original value.

d)

decreases to one-fourth its original value.

18.

What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit?

a)

zero

b)

90°

c)

180°

d)

270°

19.

The formula for inductive reactance is

a)

$\frac{1}{\omega L}$

b)

$\omega C$

c)

$\frac{1}{\omega C}$

d)

$\omega L$

20.

A Capacitor blocks

a)

Only a.c.

b)

Only d.c.

c)

Both ac and dc

d)

None of these

21.

Average power dissipated in an ideal inductor in a.c. circuit is:

a)

Infinite

b)

100

c)

0

d)

1

pre test

Total questions: 21

Worksheet time: 13mins

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