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Cumulative Exam — Cumulative exam Answers

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Which wave is carrying the most energy?

A
A wave with large amplitude.
Option A
B
A wave with very large amplitude.
Option B
C
A wave with small amplitude.
Option C
D
A wave with medium amplitude.
Option D
2
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Briana builds a circuit that has a resistance of 8.0 . What voltage should she apply to have a current of 0.8 A?

Question illustration
A
0.10 V
B
6.4 V
C
7.2 V
D
10 V
3

Plants appear green because they do not absorb the green wavelengths of light. What happens to those green light waves when they hit a plant?

A
They are diffracted.
B
They are absorbed.
C
They are reflected.
D
They are refracted.
4

Lisa made the electromagnet shown.

Question illustration
A
She can use a nail with weaker magnetic properties.
B
She can change the direction of the nail.
C
She can increase the number of wire loops.
D
She can reduce the current in the wire.
5

What is the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high? (Formula: PE = mgh)

A
75 J
B
735 J
C
245 J
D
37.8 J
6

Jan is holding an ice cube. What causes the ice to melt?

A
Thermal energy from the ice is transferred to the air.
B
Thermal energy from Jan’s hand is transferred to the ice.
C
The air absorbs thermal energy from Jan’s hand.
D
Jan’s hand absorbs thermal energy from the ice.
7

Which would increase the speed of a sound wave?

A
A wave passes from a solid to a liquid while remaining the same temperature.
B
The medium increases in temperature while remaining in the same phase.
C
The medium decreases in temperature while remaining in the same phase.
D
A wave passes from a liquid to a gas while remaining the same temperature.
8

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.
9

A flashlight has a resistance of 2.4 . What voltage is applied by the batteries if the current in the circuit is 2.5 A?

Question illustration
A
0.96 V
B
1.0 V
C
4.9 V
D
6.0 V
10

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
11

Which best explains why Greg’s hands get warm as he holds a bowl of hot soup?

A
Heat energy is created from the thermal energy in Greg’s hands.
B
Heat energy is absorbed by the soup from Greg’s hands.
C
Thermal energy from the soup moves to Greg’s hands.
D
Thermal energy from the surrounding air moves to Greg’s hands.
12

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.
13

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
14

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
15

In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?

A
Water molecules will break apart and flow in a circular pattern.
B
Water molecules will bond together and rise upward.
C
The water will become more dense and sink downward.
D
The water will become less dense and rise upward.
16

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
17

A probe is launched from Earth and lands on Mars. The gravitational acceleration on Mars is 3.7 m/s2.

A
The mass of the probe remains the same, but the weight of the probe increases.
B
The mass of the probe remains the same, but the weight of the probe decreases.
C
The mass of the probe increases, but the weight of the probe remains the same.
D
The mass of the probe decreases, but the weight of the probe remains the same.
18

Luz, who is skydiving, is traveling at terminal velocity with her body parallel to the ground. She then changes her body position to feet first toward the ground. What happens to her motion?

A
She will continue to fall at the same terminal velocity because gravity has not changed.
B
She will slow down because the air resistance will increase and be greater than gravity.
C
She will speed up because air resistance will decrease and be less than gravity.
D
She will begin to fall in free fall because she will have no air resistance acting on her.
19

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.
20

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

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