AnswersFL-2003310-Physical ScienceUnit Test

Unit Test — Cumulative exam Answers

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1
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Which conditions produce low pitches from a guitar string?

A
short strings, more tension, thick strings
B
long strings, less tension, thick strings
C
short strings, less tension, thin strings
D
long strings, more tension, thin strings
2
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What is common between transverse waves and longitudinal waves?

A
Both include an amplitude, crest, and rarefactions
B
Both move faster at higher temperatures
C
Both move slower through densely packed molecules
D
Both include a wavelength from compression to compression
3

Which best defines energy?

A
a type of wave that carries energy through space, where there is almost no matter
B
a disturbance that carries energy form one place to another through matter and space
C
the ability to do work
D
pressing to make more compact
4

Jin listed some common thermal insulators and conductors in a chart.Which belongs in the area marked with an X?

Question illustration
A
iron
B
foam
C
wood
D
glass
5

Which of these prevents conduction from occurring?

A
equal masses
B
different masses
C
equal temperatures
D
different temperatures
6

Tyler and his family drove from Atlanta to Baltimore. They traveled a total of 678 miles over 2 days.What is the reference point in this scenario?

A
Atlanta
B
Baltimore
C
678 miles
D
2 days
7

A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

A
22 J
B
4200 J
C
4600 J
D
880,000 J
8

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
9

What must be true in order for magnetism to induce an electric current in a wire?

A
There needs to be a switch in the circuit.
B
There cannot be a switch in the circuit.
C
The wire must be part of a closed circuit.
D
The wire must be part of an open circuit.
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 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.
12

How are the electric field lines around a positive charge affected when a second positive charge is near it?

A
The field lines combine with the lines around the second positive charge.
B
The field lines overlap with the lines from the second positive charge.
C
The field lines bend toward the second positive charge.
D
The field lines bend away from the second positive charge.
13

The lens in the eyepiece of a reflecting telescope breaks. How will this most affect the function of the telescope?

A
Magnified images will appear upside down.
B
Magnified images will not be created.
C
Light from distant objects will not be captured.
D
Light rays will not be sent to the eyepiece.
14

The waves created by two speed boats in a lake interact to form larger waves. This is an example of

A
constructive interference.
B
destructive interference.
C
absorption
D
transmission
15

Under which condition is no work done?

A
A force pushes an object and slows it down.
B
A force pulls an object and speeds it up.
C
A force pulls down on an object that moves downward.
D
A force pushes up on an object that stays in place.
16

Which best describes what happens if two waves meet and build on each other?

A
constructive interference
B
destructive interference
C
reflection
D
absorption
17

Which statement best describes heat and thermal energy?

A
They are different words for the same thing.
B
They represent different concepts.
C
Heat is what happens when thermal energy stops moving between substances.
D
Thermal energy is what happens when heat moves between substances.
18

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
19

Yolanda is studying two waves. The first wave has an amplitude of 2 m, and the second has an amplitude of 3 m.

A
She can use destructive interference to generate a wave with an amplitude of 3.1 m.
B
She can use constructive interference to generate a wave with an amplitude of 1.5 m.
C
She can use destructive interference to generate a wave with an amplitude of 0 m.
D
She can use constructive interference to generate a wave with an amplitude of 3.5 m.
20

What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero

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