AnswersDL Physical Science A switched content 2023Cumulative Exam

Cumulative Exam — Cumulative exam Answers

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1
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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.
2
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Which sound would most likely have the lowest pitch?

A
a bird chirping
B
a vacuum-cleaner running
C
a lawn mower running
D
a dog barking
3

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.
4

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.
5

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.
6

Two objects are held close together. When they are released, they move toward one another. Which conclusion is supported by this evidence?

A
The objects are both positively charged.
B
The objects are both negatively charged.
C
The objects have no charge.
D
The objects have opposite charges.
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

Question text not available

Question illustration
A
The forces are balanced.
B
The box will move to the right.
C
The box will move to the left.
D
The forces are unbalanced.
9

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.
10

How does a machine, such as a ramp, help make work easier?

A
A machine can help decrease the input force and the output force.
B
A machine can help increase the input force and the output force.
C
A machine can help increase the input force and decrease the output force.
D
A machine can help decrease the input force and increase the output force.
11

Why do nuclear power plants use fission instead of fusion?

A
Scientists have not yet gotten a fusion reaction to happen on Earth.
B
Per gram of fuel, fission releases more energy than fusion.
C
The energy from fusion cannot yet be converted to electricity.
D
Fusion requires conditions that use too much energy to maintain.
12

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.
13

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
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

The thermal energy in a hot iron flows into a shirt. What can possibly be said about this situation?

A
The iron is warmer than the shirt.
B
The iron has less energy than the shirt.
C
The iron is 92°C and the shirt is 96°C.
D
The iron has less heat than the shirt.
16

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.
17

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
18

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
19

What is the kinetic energy of a toy truck with a mass of 0.75 kg and a velocity of 4 m/s? (Formula: )

Question illustration
A
3 J
B
6 J
C
12 J
D
24 J
20

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%

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