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Cumulative Exam — Cumulative exam Answers

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Bill does 1500 J of work on a lever, which is a simple machine. The lever does 1350 J of work on a stone.What is the efficiency of the lever?

A
0.9%
B
1.1%
C
90%
D
111%
2
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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.
3

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.
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

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.
7

A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?

A
mechanical and nuclear
B
radiant and thermal
C
thermal and mechanical
D
nuclear and electrical
8

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
9

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
10

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.
11

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.
12

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.
13

Which best describes what is required for any sound wave to travel?

A
empty space
B
any medium
C
solid
D
liquid
14

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
15

A circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

A
The brightness of each bulb would decrease because the total resistance of the circuit would decrease.
B
The brightness of each bulb would increase because the total resistance of the circuit would increase.
C
The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.
D
The brightness of each bulb would remain the same even though the total resistance of the circuit would increase.
16

The field lines around one end of a bar magnet are shown below.

Question illustration
A
It is a south pole because the field lines spread out from this end.
B
It is a north pole because the field lines spread out from this end.
C
It is a south pole because the field lines enter the magnet at this end.
D
It is a north pole because the field lines enter the magnet at this end.
17

Finley is trying to transmit a sound wave that will travel continuously, but he is frustrated by the excess noise. What kind of signal is Finley sending?

A
analog
B
digital
C
radio
D
infrared
18

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.
19

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
20

What do MRI and ultrasound have in common as diagnostic imaging techniques? Check all that apply.low risk for tissue damageuses radio wavesnoninvasivetomographic imagingno radiation

A
low risk for tissue damage
B
uses radio waves
C
noninvasive
D
tomographic imaging
E
no radiation

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