AnswersFL-2003310-Physical ScienceUnit Test

Unit Test — Cumulative exam Answers

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1
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Which type of electromagnetic waves make up the colors of a rainbow seen after a storm?

A
visible light
B
infrared light
C
X-rays
D
ultraviolet light
2
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A circuit is a path along which electric current flows. How would changing the battery in a circuit from 9 volts to 1.5 volts most likely affect the circuit?

A
More electric charge would flow in the circuit.
B
Less electric charge would flow in the circuit.
C
The resistance in the circuit would decrease.
D
The resistance in the circuit would increase.
3

Which of these actions would decrease heat transfer between two objects?

A
increasing the temperature of the warmer object
B
increasing the area of their contact
C
reducing the thermal energy of the cooler object
D
reducing the time of their contact
4

The diagram shows a toy car on a number line.

Question illustration
A
–4
B
1
C
2
D
4
5

Based on the concept of the global conveyor belt, what happens to ocean water as it moves from Antarctica to the equator?

A
It transfers thermal energy to deeper layers of the ocean.
B
It becomes less dense and rises to the surface.
C
It transfers thermal energy to the area, warming the equatorial waters.
D
It becomes more dense and sinks to the ocean bottom.
6

Samantha is observing a salt crystal under a microscope. She wants to view more details by enlarging the image of the crystal. Which would allow her to do this?

A
increasing the amount of light that shines on the crystal
B
decreasing the amount of light that shines on the crystal
C
increasing the strength of the objective lens
D
decreasing the strength of the objective lens
7

Which is the best example of the law of conservation of energy?

A
A basketball stops bouncing because its energy disappears.
B
A rolling skateboard slows down because some of its kinetic energy changes to heat.
C
A falling book hits the ground and all of its energy is destroyed.
D
A toy car gains speed as it moves down a ramp because the ramp creates energy.
8

Pravat exerts a force of 30 N to lift a bag of groceries 0.5 m. How much work did Pravat do on the bag?Note : Work = Force x Distance

A
0 J
B
15 J
C
30 J
D
60 J
9

Jerimiah is studying Wave A and Wave B. Wave A is traveling at 3 hertz, and Wave B is traveling at 1.2 hertz.

A
Refraction would occur.
B
Interference would occur.
C
The resulting wave would travel at 4.2 hertz.
D
The crest of Wave A would overlap the trough of Wave B.
10

Which change will decrease the electric force between two positively charged objects?

A
moving them closer together
B
moving them farther apart
C
adding neutrons
D
removing electrons
11

A car has a mass of 1,200 kg. What is its acceleration when the engine exerts a force of 600 N? (Formula: F=ma)

A
0.5 m/s2
B
2 m/s2
C
600 m/s2
D
1,800 m/s2
12

Which best describes a difference between electric current and static electricity?

A
Electric current is continuous, and static electricity is not continuous.
B
Static electricity is continuous, and electric current is not continuous.
C
Electric current involves the movement of electrons, and static electricity involves the movement of protons.
D
Static electricity involves the movement of electrons, and electric current involves the movement of protons.
13

Nolan set up the equipment shown in order to induce a current in a wire.

Question illustration
A
The wire needs to be coiled less tightly.
B
The wire needs to be straight, not coiled.
C
The magnet needs to be moved through the coils of wire.
D
The magnet needs to be held above the coils of wire.
14

Kenneth ran a marathon (26.2 miles) in 5.5 hours. What was Kenneth’s average speed? (Round your answer to the nearest tenth.)

A
0.2 mph
B
4.8 mph
C
5.5 mph
D
144.1 mph
15

Which best compares radiation and conduction?

A
Both transfer thermal energy from warm objects to cooler objects.
B
Both can transfer energy through empty space.
C
Both transfer thermal energy by electromagnetic waves.
D
Both involve the transfer of energy through direct contact.
16

Theresa comes up with four examples of waves: sound wave, ocean wave, light wave, and hand wave. Which of Theresa's examples is not an actual scientific wave?

A
Sound wave
B
Ocean wave
C
Light wave
D
Hand wave
17

Carla draws two circuit diagrams that connect the same components in different ways, as shown.

Question illustration
A
The total resistance in Circuit A is greater than that in Circuit B.
B
When a bulb in Circuit A goes out, the other bulbs keep shining.
C
The bulbs in Circuit A shine brighter than those in Circuit B.
D
When a bulb in Circuit B goes out, the other bulbs go out.
18

Which is most likely to get hot fastest when touching a warm surface?

A
foam cup
B
wooden spoon
C
copper wire
D
plastic button
19

Marcus plucks at an outstretched coil and observes the following wave motion. What is the motion of the particles in this kind of wave?

Question illustration
A
The particles will move up and down over large areas.
B
The particles will move up and down over small areas.
C
The particles will move side to side over small areas.
D
The particles will move side to side over large areas.
20

Which is one characteristic shared by electromagnetic and mechanical waves?

A
Both have a frequency and amplitude.
B
Both move due to particles bumping into each other.
C
Both are formed by charged particles.
D
Both occur as a result of a disturbance.

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