Quiz about Electricity - Reid Physical Science

Question 1

A plastic rod is rubbed with a piece of wool, and a glass rod is rubbed with a piece of silk. An object is placed near the plastic rod, and an attractive force is detected. How will the object react when near the glass rod?

Accepted Answer

A repulsive force will occur

Answer

An attractive force will occur

Answer

A neutralization will occur

Answer

An electric discharge will occur

Question 2

A scientist sets up an investigation. A positively-charged metal plate is placed in a container. The air in the container has a high concentration of floating dust. Some of the dust particles are attracted to the plate. What property is shared by the dust particles that are attracted to the plate?

Accepted Answer

They are negatively charged.

Answer

They are electrical insulators

Answer

They are less massive than oxygen molecules

Answer

They are less dense than the plate.

Question 3

Greg rubbed a balloon vigorously against his hair. Then he held the balloon out toward the wall. The picture shows what happened. Which best explains why rubbing he balloon against his hair made it stick to the wall?

Accepted Answer

The charges between the balloon and the wall were opposite.

Answer

The gas that kept the balloon inflated made it float until it came in contact with a hard surface.

Answer

Natural oils in his hair transferred tot he balloon and gave it a sticky quality.

Answer

The balloon and the wall were both positively charged.

Question 4

Bar 1 is made of glass and has been rubbed wit silk. Bar 2 is made of rubber and has been rubbed with fur. If the bars are held close to one another, why will the hanging bar move toward the held bar?

Accepted Answer

The bars have opposite charges.

Answer

The bars have become neutral

Answer

Both bars have in increase in negatively-charged particles.

Answer

Both bars have an increase in positively-charged articles.

Question 5

During a thunderstorm, Charles watched flashes of lightning through his window. Which process BEST describes the cause of the lightning?

Accepted Answer

charged particles moving between positively and negatively charged parts of clouds

Answer

chemicals from different clouds combining to release energy

Answer

radioactive atoms in the atmosphere exploding between clouds

Answer

heat energy jumping between warmer clouds and colder clouds

Question 6

A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this?

Accepted Answer

removed electrons from her hair.

Answer

gave her hair a neutral charge

Answer

removed protons from her hair

Answer

gave her hair a negative charge

Question 7

Anna notices that different types of clothing stick together when they are dried in an electric dryer. When the clothes are pulled apart, they make sparks and a crackling sound due to electric forces of attraction. How can Anna reduce the amount the clothing clings together in the dryer?

Accepted Answer

Add a substance to the wash that reduces the number of charges transferred.

Answer

Increase the temperature of the air in the dryer to weaken the electric forces.

Answer

Dry more clothes at the same time so that there is less room for electric forces.

Answer

Change the charges on the clothes by running the dryer at a faster speed.

Question 8

What type of charge do individual hair strands have when standing on end due to static electricity?

Accepted Answer

temporary positive charges

Answer

neutral charges

Answer

neutral discharge

Answer

permanent positive charge

Question 9

This diagram represents a closed circuit with three identical lightbulbs. If bulb Y stops working in the circuit, what will happen to bulbs X and Z?

Accepted Answer

Bulb X and bulb Z will glow.

Answer

Bulb X and bulb Z will not glow.

Answer

Bulb X will glow, but bulb Z will not glow.

Answer

Bulb X will not glow, but bulb Z will glow.

Question 10

This diagram represents closed series circuit. What would happen if the voltage were doubled?

Accepted Answer

The current would double.

Answer

The current would quadruple.

Answer

The current would remain constant.

Answer

The current would be reduced by half.

Question 11

What is the name of the circuit in which the current splits at the junctions?

Accepted Answer

parallel circuit

Answer

closed circuit

Answer

series circuit

Answer

short circuit

Question 12

Four significantly different household appliances (blender, mixer, toaster, and food processor) are plugged into four outlets along a counter. Turning on or off one or more of the appliances does not affect the performance of the other appliances because the four appliances

Accepted Answer

are connected in parallel

Answer

run on a direct current

Answer

are connected in series.

Answer

run on an alternating current.

Question 13

A student assembles a series circuit for an investigation. The student uses different resistors and measures the current with each.

Circuit Investigation

Resistance Current

(in Ohms) (in Amps)

1 9

3 3

6 1.5

9 1

The observations indicate which general rule about series circuits?

Accepted Answer

Resistance and current are inversely proportional.

Answer

The sum of resistance and current is a constant

Answer

Resistance consumes more energy than current.

Answer

Current generates more electrons than resistance

Question 14

If Bulb 1 burns out, which other bulb(s) will also stop emitting light?

Accepted Answer

2

Answer

3

Answer

3 and 4

Answer

2, 3, and 4

Question 15

If Bulb 8 burns out, how will the remaining bulbs be affected?

Accepted Answer

All the remaining bulbs go out.

Answer

All the remaining bulbs stay lit.

Answer

Only bulbs 1 - 4 stay lit.

Answer

Bulb 4 is the only other bulb to go out.

Question 16

In each circuit below, a 1.5 V battery is wired to an identical light bulb. All of the wires are made of the same material and are the same length, but the thickness of each is different, as shown. Apply how resistivity of a wire affects resistance to predict how the brightness (measure of current) of the bulbs would compare.

Accepted Answer

Bulb X > Bulb Z > Bulb W > Bulb Y

Answer

Bulb Y > Bulb W > Bulb Z > Bulb X

Answer

Bulb W > Bulb X > Bulb Z > Bulb Y

Answer

Bulb Y > Bulb Z > Bulb X > Bulb W

Question 17

For a set voltage in a circuit, if the length of the wire is decreased by one-half, what is the effect on the resistance and current in the circuit?

Accepted Answer

the resistance halves and the current doubles.

Answer

the resistance doubles and the current halves.

Answer

the resistance halves and the current halves

Answer

the resistance doubles and the current doubles.

Question 18

Which of the following would cause the greatest increase in resistance to a wire in a circuit?

Accepted Answer

reducing the cross-sectional area of the wire by one-quarter

Answer

tripling the resistivity of the material

Answer

doubling the length of the wire

Answer

reducing the length of the wire by one-half

Question 19

Which change to a wire would cause its resistance to decrease?

Accepted Answer

increase its diameter

Answer

increase its length

Answer

increase its temperature

Answer

increase its resistivity

Question 20

For a set voltage, which of the following changes to the wire in a circuit would quadruple the current in the wire?

Accepted Answer

double the radius of the wire

Answer

quadruple the radius of the wire

Answer

double the length of the wire

Answer

quadruple the length of the wire.

Question 21

Why does temperature affect movement of electrons, and thus the resistivity of a material?

Accepted Answer

When temperature increases, the thermal vibrations of atoms increase, causing collisions between moving electrons to be more frequent, thus increasing resistivity.

Answer

When temperature increases, the thermal vibrations of atoms decrease, causing collisions between moving electrons to be less frequent, thus decreasing resistivity.

Answer

When temperature decreases, the thermal vibrations of atoms increase, causing collisions between moving electrons to be more frequent, thus increasing resistivity.

Answer

When temperature decreases, the thermal vibrations of atoms decrease, causing collisions between moving electrons to be more frequent, thus increasing resistivity.

Question 22

How would decreasing the diameter of the wires in a circuit influence the resistance and flow of electrons in the circuit?

Accepted Answer

It would increase the resistance, causing fewer electrons to flow through the circuit.

Answer

It would decrease the resistance, causing fewer electrons to flow through the circuit.

Answer

It would decrease the resistance by allowing more electrons to flow through the circuit.

Answer

It would increase the resistance by allowing more electrons to flow through the circuit.

Question 23

If an electric clothes dryer uses 35 amps of current on a 250 V circuit for 2 hours, how many kilowatt hours (kWh) were used? How much would it cost to run the dryer if the cost of energy is $0.07 per kWh?

Accepted Answer

17.5 kWh at a cost of $1.23

Answer

200 kWh at a cost of $22.00

Answer

7.14 kWh at a cost of $0.50

Answer

17,500 kWh at a cost of $1225

Question 24

A current of 250 amps is flowing through a copper wire with a resistance of 0.021 ohms. What is the voltage?

Accepted Answer

5.25 volts

Answer

11,900 volts

Answer

1300 volts

Answer

10.5 volts

Question 25

A 750 W coffee maker is operating on 110 volts. What is the current being used?

Accepted Answer

6.82 amps

Answer

0.147 amps

Answer

82,500 amps

Question 26

Find the applied voltage of a circuit that draws 0.2 amps through a 4800 ohm resistance.

Accepted Answer

960 volts

Answer

24,000 volts

Answer

0.4 volts

Question 27

Amber's hair dryer requires 15 A of current from a 110 V outlet. How much power does it use?

Accepted Answer

1650 watts

Answer

1.65 watts

Answer

7.3 watts

Electricity - Reid Physical Science

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