AnswersDL Physical Science A switched content 2023Unit Test

Unit Test — Cumulative exam Answers

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1
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Which provides resistance in an electric circuit?

A
wire
B
light bulb
C
battery
D
switch
2
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Which unit is used to measure resistance?

A
volts
B
charges
C
amperes
D
ohms
3

How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)

A
0.008 s
B
8 s
C
120 s
D
1,785,000 s
4

Which of these most directly affects what happens to white light when it hits an object?

A
the properties of the object
B
the source of the light
C
the speed at which the light travels
D
the distance of the object from the light
5

Which waves can travel through space?

A
electromagnetic waves only
B
mechanical waves only
C
electromagnetic and mechanical waves
D
longitudinal and electromagnetic waves
6

At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?

7
77°F
9
95°F
2
280K
3
300K
7

Which shows the temperatures of three substances, in order, from greatest to least?

w
water vapor, ice, water
i
ice, water, water vapor
w
water, water vapor, ice
w
water vapor, water, ice
8

Which process would correctly calculate the frequency of a wave?

A
dividing speed by wavelength
B
dividing frequency by wavelength
C
multiplying frequency by period
D
dividing wavelength by period
9

Which shows the formula for converting from kelvins to degrees Celsius?

°
°C = (9/5 × K) +32
°
°C = 5/9 × (K – 32)
°
°C = K – 273
°
°C = K + 273
10

According to Ohm’s law, which combination of units is the same as the unit for voltage?

A
ohm ÷ ampere
B
ampere × ohm
C
ohm + ampere
D
ampere ÷ ohm
11

The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects.Which number should be in the cell with the question mark?

Question illustration
A
The number is two because when you double the mass of one of the objects, the force between the objects is halved.
B
The number is four because when you double the mass of one of the objects, the force between the objects remains the same.
C
The number is eight because when you double the mass of one of the objects, the force between the objects also doubles.
D
The number is sixteen because when you double the mass of one of the objects, the force between the objects increases by a factor of 4.
12

Which compares the problems associated with radioactive waste created from generating electricity using fusion reactions to waste created from generating electricity using fission reactions?

A
The radioactive waste from fusion reactions becomes less hazardous much sooner than the waste from fission reactions.
B
The radioactive waste from fission reactions becomes less hazardous much sooner than the waste from fusion reactions.
C
Although their radioactive wastes are hazardous for the same period of time, fusion reactions produce less waste than fission reactions.
D
Although their radioactive wastes are hazardous for the same period of time, fission reactions produce less waste than fusion reactions.
13

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.
14

As the temperature of a medium increases, the speed of the sound wave

A
increases because the particles bump into each other more often.
B
increases because the particles bump into each other less often.
C
decreases because the particles bump into each other more often.
D
decreases because the particles bump into each other less often.
15

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

A
microwaves
B
infrared light
C
gamma rays
D
radio waves
16

Which best describes a difference between energy transformations in power plants and dams?

A
Only power plants use fossil fuels to transform energy.
B
Only dams use fission to generate thermal energy.
C
Only power plants use water to turn turbines.
D
Only dams use mechanical energy to produce electricity.
17

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.
18

Noe is studying Wave A and Wave B. Wave A is rated at 100 dB, and Wave B is rated at 90 dB. Which statement can be made about the waves?

A
Wave A has fewer decibels than Wave B.
B
Wave A is louder than Wave B.
C
The intensity of both waves is the same.
D
The amplitude of both waves is the same.
19

Wapi collected data about four machines and listed it in this table. Which machine has the greatest output force?

Question illustration
A
A
B
B
C
C
D
D
20

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

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