AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Lab: Newton's Laws of Motion

Lab: Newton's Laws of Motion — Cumulative exam Answers

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Which is an example of radiation?

A
A melting snowman sweats drop of water under a bright sun.
Option A
B
A smiling man roasts marshmallows over a wood fire.
Option B
C
A cook stirs vegetables in a frying pan over a gas burner.
Option C
D
Three pairs of bare feet and lower legs walk across black pavement.
Option D
2
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Which best compares a brush and a commutator in an electric motor?

A
Both rotate when the motor is on.
B
Both carry electrical current from a power source.
C
Both remain stationary when the motor is on.
D
Both have a permanent magnetic field.
3

Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temperature spoon. Which substance will have heat flow from it to the other substances?

A
the milk
B
the spoon
C
the oatmeal
D
the surrounding air
4

Look at the circuit diagram.

Question illustration
A
one
B
two
C
three
D
four
5

Measurements of two electric currents are shown in the chart.

Question illustration
A
Current X has a greater potential difference, and the charges flow at a slower rate.
B
Current Y has a greater potential difference, and the charges flow at a slower rate.
C
Current X has a greater potential difference, and the charges flow at a faster rate.
D
Current Y has a greater potential difference, and the charges flow at a faster rate.
6

What does voltage describe?

A
how fast current can flow
B
how much current can flow
C
how much a material resists electrical flow
D
how fast a material conducts electrical flow
7

The energy of microwaves is less than the energy of ultraviolet light. Which comparison of the energies of electromagnetic waves is correct?

A
Gamma rays have higher energy than microwaves because gamma rays have shorter wavelengths.
B
Gamma rays have higher energy than microwaves because gamma rays have lower frequencies.
C
Infrared light has lower energy than X-rays because infrared light has shorter wavelengths.
D
Infrared light has lower energy than X-rays because infrared light has higher frequencies.
8

A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current?

A
0.5 A
B
2 A
C
4 A
D
8 A
9

What happens when the amount of fissionable material exceeds the critical mass?

A
The chain reaction accelerates as more neutrons are generated with each round of reaction.
B
The chain reaction is not sustained and eventually stops.
C
The density of the reacting particles decreases, slowing the reaction.
D
The amount of material needed to establish a new critical mass increases.
10

Which types of electromagnetic waves have wavelengths that are longer than those of visible light but shorter than those of microwaves?

A
gamma rays
B
X-rays
C
infrared light
D
radio waves
11

Hamish is studying what happens when he sends a sound wave through different mediums, and he records his data in a table.

Question illustration
A
Wave 1 will move the fastest.
B
Wave 2 will move the slowest.
C
Wave 3 will move the slowest.
D
Wave 4 will move the fastest.
12

A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?

A
0.3 A
B
0.4 A
C
1.2 A
D
3.6 A
13

Which part of the electromagnetic spectrum is nearest to X-rays?

A
microwaves
B
infrared light
C
gamma rays
D
radio waves
14

Which situation would result in interference?

A
a wave bouncing off an object
B
a wave bending as it moves through an object
C
a wave scattering as it moves through an object
D
a wave increasing in energy as it hits another wave
15

The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released?

A
It will move toward the second magnet because like poles repel.
B
It will move toward the second magnet because like poles attract.
C
It will move away from the second magnet because like poles repel.
D
It will move away from the second magnet because like poles attract.
16

Which type of radiation do people try to protect themselves from by wearing protective clothing that is made of aluminum?

A
alpha radiation
B
beta radiation
C
gamma radiation
D
photon radiation
17

What is the overall energy transformation in a coal-fired power plant?

A
electrical to chemical
B
chemical to electrical
C
nuclear to radiant
D
radiant to nuclear
18

Parker wound a wire around a large iron nail. He then created an electromagnet by connecting the ends of the wire to different batteries. The table shows the current he measured for each electromagnet.

Question illustration
A
Electromagnet W is the strongest.
B
Electromagnet X is weaker than electromagnet Z.
C
Electromagnet Y is the strongest.
D
Electromagnet Y is weaker than electromagnet X.
19

Masako measures a circuit at 12 V and 2 A. Using Ohm's law, what can he calculate for the circuit?

A
resistance ()
Option A
B
resistance (O)
C
current (I)
D
current ()
Option D
20

Which refers to an object’s resistance to any change in its motion?

A
force
B
acceleration
C
gravity
D
inertia

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