Question 1

Which of the following explains why a rubber rod becomes negatively charged when rubbed with a piece of fur?

Accepted Answer

Electrons are added to the rod.

Answer

Protons are removed from the rod.

Answer

The fur is left neutral.

Answer

Electrons are added to the fur.

Question 2

Two point charges, initially 20 cm apart, are moved to a distance of 100 cm apart. What is the factor in the change of the resulting electric force between them?

Accepted Answer

1/25

Answer

1/5

Answer

25

Answer

5

Question 3

What happens when two charges are moved closer together?

Accepted Answer

The force between the charges increases.

Answer

The total charge increases.

Answer

The electric field doubles.

Answer

Coulomb’s law takes effect.

Question 4

Two equal charges are separated by 3.7 × 10⁻¹⁰ m. The force between the charges has a magnitude of 2.37 × 10⁻³N. What is the magnitude of q on the charges?

Accepted Answer

1.9 x 10 ^-19C

Answer

3.8 x 10 ^-19C

Answer

3.8 x 10 ^-19C

Answer

7.6 x 10 ^-19C

Question 5

Two point charges having charge of -2.0 μC and 4.0 μC are separated by 1.5 cm. What is the electric force between them?

Accepted Answer

-3.2 x 10 ² N

Answer

-3.2 x 10 ^-2 N

Answer

-3.2 x 10 ^-10N

Answer

-3.2 x 10 ¹⁰ N

Question 6

What is the direction of the electric field around an isolated negative charge?

Accepted Answer

Points inward.

Answer

Points outward

Answer

Forms clockwise circles about the charge.

Answer

Forms counterclockwise circles about the charge.

Question 7

A positively charged rod is brought close to one end of a metallic plate. What type of charge is induced on the left side of the plate?

Accepted Answer

Negative

Answer

Positive

Answer

It stays neutral

Answer

It depends on the contact time.

Question 8

A negatively charged sphere A is placed near sphere B. Sphere B is touched with a grounded wire. What is the charge on sphere B when the wire is removed?

Accepted Answer

Positive

Answer

Negative

Answer

It stays neutral

Answer

It depends on the contact time.

Question 9

Two electrostatic point charges of +20.0 μC and –30.0 μC exert attractive forces on each other of –125 N. What is the distance between the two charges?

Accepted Answer

2.08 x 10 ^-1 m

Answer

2.08 x 10 ^-5 m

Answer

2.08 x 10 ⁵ m

Answer

2.08 x 10 ¹m

Question 10

Which is the method of charging an object by rubbing it against another object?

Accepted Answer

Friction

Answer

Polarization

Answer

Conduction

Answer

Induction

Question 11

If electric flux means flow of electric field lines, when is electric flux outward?

Accepted Answer

Positive charge in interior.

Answer

No charge.

Answer

Negative charge in interior.

Answer

Both charges in interior.

Question 12

The total flux through the below spherical surface is

Accepted Answer

zero

Answer

negative

Answer

not well defined

Answer

positive

Question 13

Which has the smallest magnetic flux?

Accepted Answer

d

Answer

c

Answer

a and b

Answer

a

Question 14

The net flux through a 3D closed surface is 2.2 x 10³ Nm²/C. How much charge must be inside the surface?

Accepted Answer

1.9 x 10^-8 C

Answer

1.9 x 10⁸ C

Answer

1.9 x 10¹⁹ C

Answer

1.9 x 10^-19 C

Question 15

In the figure below, a configuration of four closed surfaces and three charges of -2Q−, +Q, and -Q is shown. What is the electric flux through surface 3.

Accepted Answer

-2Q

Answer

-Q

Answer

2Q

Answer

Q

Question 16

A positive charge moved perpendicularly to the direction of a uniform electric field. What is its electric potential?

Accepted Answer

zero

Answer

same

Answer

maximum

Answer

minimum

Question 17

What will most likely happen to the electric potential of a positive charge if its distance from another positive charge increases?

Accepted Answer

Decreases

Answer

Remains the same

Answer

Increases

Answer

Fluctuates

Question 18

How is electric potential related to work?

Accepted Answer

Electric potential occurs when a charge displaces due to a force.

Answer

Electric potential increases when work decreases.

Answer

Electric potential exists when an external force changes the charge.

Answer

Electric potential involves charges being moved back and forth to its position.

Question 19

The upper metal plate on the CRT system has positive charge of 5.2 x10^-7C and the lower plate has an equal-magnitude negative charge. The plates are 0.05 cm apart and both has an area of 4 x10^-3m² .

What is the average electric potential V between the plates?

Accepted Answer

7.35 x 10³ V

Answer

8.25 x 10³ V

Answer

10.05 x 10⁵ V

Answer

9. 15 x 10⁴ V

Question 20

A positive charge is in the vicinity of another positive charge. At what position is the electric potential the highest?

Accepted Answer

A

Answer

D

Answer

B

Answer

C

Question 21

The current in an electron beam in a cathode-ray tube is 7.0 × 10⁻⁵ A. How much charge hits the screen in 5.0 s?

Accepted Answer

3.5 × 10⁻⁴ C

Answer

5.6 × 10⁻² C

Answer

2.8 × 10³ C

Answer

5.3 × 10⁻⁶ C

Question 22

What is the potential difference across a 5.0 Ω resistor that carries a current of 5.0 A?

Accepted Answer

25 V

Answer

1.0 × 10²V

Answer

1.0 V

Answer

10.0 V

Question 23

Which of the following wires would have the least resistance, assuming that all of the wires have the same cross-sectional area?

Accepted Answer

a copper wire 5 cm in length

Answer

an iron wire 10 cm in length

Answer

an iron wire 5 cm in length

Answer

a copper wire 10 cm in length

Question 24

Which equation below for electric power is INCORRECT?

Accepted Answer

P=V/R2

Answer

P=I2R

Answer

P=V2/R

Answer

P=IV

Question 25

Which of the following factors would decrease the resistance through an electrical cord?

Accepted Answer

Increasing the cross-sectional area of the cord

Answer

Increasing the length of the cord

Answer

Increasing the resistivity

Answer

Decreasing the cross-sectional area of the cord

Question 26

If the potential difference in a circuit is doubled, what happens to the capacitance of the capacitor connected in the circuit?

Accepted Answer

Half

Answer

Doubled

Answer

Cannot be determined

Answer

Remains the same

Question 27

What is the total voltage of a combination of capacitors in parallel connection if one of the capacitor’s voltage is 9 volts?

Accepted Answer

9 V

Answer

6 V

Answer

3 V

Answer

12 V

Question 28

Which of the following may NOT affect the capacitance in a capacitor?

Accepted Answer

Permittivity in vacuum

Answer

Separating distance of the plate

Answer

Dielectric constant

Answer

Area of the plate

Question 29

Which of the following is TRUE about capacitors in parallel connection?

Accepted Answer

The equivalent capacitance is equal to the sum of the individual capacitances.

Answer

The equivalent capacitance is always less than any individual capacitance.

Answer

The capacitors are connected along a single path.

Answer

The voltage is equal to the sum of the voltages across each capacitor.

Question 30

Which of the following best describe a capacitor?

Accepted Answer

It stores electric energy.

Answer

It strengthens the energy output in devices.

Answer

It produces electric energy.

Answer

It gives electric and potential energy.

Question 31

If the potential difference across the bulb is 5.0 V, what is the potential difference across the battery used to power it?

Accepted Answer

5.0 V

Answer

1.0 V

Answer

9.0 V

Answer

3.0 V

Question 32

Three resistors with values of 2.0 Ω, 4.0 Ω, and 6.0 Ω, respectively, are connected in series. What is their total resistance?

Accepted Answer

12 Ω

Answer

6.0 Ω

Answer

1.1 Ω

Answer

8.0 Ω

Question 33

What is the equivalent resistance of R1 and R2?

Accepted Answer

20.0 Ω

Answer

15.0 Ω

Answer

10.0 Ω

Answer

5.0 Ω

Question 34

What is the equivalent resistance of R3 and R5?

Accepted Answer

4.0 Ω

Answer

8.0 Ω

Answer

16 Ω

Answer

6.0 Ω

Question 35

What is the total resistance of the resistors?

Accepted Answer

10.0 Ω

Answer

20.0 Ω

Answer

15.0 Ω

Answer

5.00 Ω

Question 36

What is the total current, I_Tof the circuit?

Accepted Answer

6.0 A

Answer

2.0 A

Answer

4.0 A

Answer

8.0 A

Question 37

In order to measure the voltage drop of a connector in a circuit, how should the voltmeter be connected?

Accepted Answer

In parallel, across each side of the connector.

Answer

In parallel, between the connector and the battery.

Answer

In series, between the connector and the battery.

Answer

In series, between the connector and the circuit load.

Question 38

Which of the following statements is TRUE for the junction in the network shown below?

Accepted Answer

I₄+ I₂ + I₃ = I₁ + I₅

Answer

I₂ + I₃ + I₅ = I₁ + I₄

Answer

I₁ + I₂ + I₃ = I₄ + I₅

Answer

I₅ − I₄= I₃ − I₂ + I₁

Question 39

Kirchhoff’s second rule or the loop rule is derived from which law?

Accepted Answer

Law of conservation of energy

Answer

Law of conservation of charge

Answer

Law of conservation of mass

Answer

Law of conservation of momentum

Question 40

Using the Kirchhoff’s second rule, what is the voltage along the 10 Ω resistor in the circuit shown below?

Accepted Answer

4 V

Answer

12 V

Answer

0 V

Answer

10 V

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