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Practice Exam Answers

29 verified answers
1
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What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
zero
D
neutral
2
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Bees can see into the ultraviolet region of the electromagnetic spectrum. Compared with humans, bees can sense electromagnetic waves that have

A
a higher frequency and a shorter wavelength.
B
a lower frequency and a longer wavelength.
C
a lower frequency and a shorter wavelength.
D
a higher frequency and a longer wavelength.
3

Ingrid says that a red ball of clay appears red because the clay reflects red wavelengths. Simon says that the clay appears red because it allows red wavelengths to pass through it. Which statement best explains who is correct?

A
Simon is correct. The clay appears red because it allows red wavelengths to pass through it.
B
Simon is correct. The clay appears red because it is a solid.
C
Ingrid is correct. The clay appears red because it is a type of matter.
D
Ingrid is correct. The clay appears red because it reflects red wavelengths.
4

Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decrease the same type of friction. Which methods could he use to perform his experiment?

A
using nonstick materials and ball bearings
B
increasing surface area and aerodynamic design
C
increasing roughness and speed
D
using lubricants and increasing surface area
5

Which is the correct order of materials in terms of reflectivity, from least to greatest?

A
black asphalt, brown soil, beige sand, white paper
B
white paper, beige sand, brown soil, black asphalt
C
beige sand, white paper, black asphalt, brown soil
D
brown soil, beige sand, white paper, black asphalt
6

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

A
It is always greater than it was before the collision.
B
It is always the same as it was before the collision.
C
It is often the same as it was before the collision.
D
It is often greater than it was before the collision.
7

Doug is doing work. Without knowing exactly what he is doing, which can be said about the work he is doing?

A
Energy is transferred.
B
Energy is increased.
C
Energy is decreased.
D
Energy is unchanged.
8

Dr. Eriksson is working on a material called selenium. She is adding a certain number and type of atoms to the selenium, which will control its conductivity. Selenium is most likely what kind of material?

A
conductor
B
insulator
C
superconductor
D
semiconductor
9

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

A
chemical to electrical
B
radiant to nuclear
C
nuclear to radiant
D
electrical to chemical
10

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

A
destructive interference.
B
absorption
C
constructive interference.
D
transmission
11

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.
12

Which provides resistance in an electric circuit?

A
light bulb
B
switch
C
battery
D
wire
13

Which is equal to a temperature of 20 times degree C ?

A
20 times degree F
B
32 times degree F
C
36 times degree F
D
68 times degree F
14

Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?

A
halfway between the like poles of two magnets, because the field lines bend away and do not enter this area
B
above the middle of a bar magnet, because the magnetic field lines are only found around the sides of the magnet
C
halfway between the opposite poles of two magnets, because the field lines are the closest together
D
above a pole of a bar magnet, because the magnetic field lines either go in or go out at the end
15

Which statement can be made about the amplitude of any transverse wave?

A
It is the length from the midpoint to the crest.
B
It is the length of the wavelength.
C
It is half the length from the midpoint to the trough.
D
It is half the length of the wavelength.
16

What is common between transverse waves and longitudinal waves?

A
Both include an amplitude, crest, and rarefactions
B
Both include a wavelength from compression to compression
C
Both move slower through densely packed molecules
D
Both move faster at higher temperatures
17

Which property makes radio waves ideal for carrying and transmitting data?

A
traveling faster than the speed of light
B
transferring high amounts of energy
C
having long wavelengths
D
having high frequencies
18

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

A
ampere divided by ohm
B
ohm divided by ampere
C
ohm plus ampere
D
ampere times ohm
19

Which indicates that thermal energy is no longer being transferred from boiling water to a mug?

A
The mug is hotter than the water.
B
The water is hotter than the mug.
C
The mug and the water lose all thermal energy.
D
The water and the mug are the same temperature.
20

A 150 g egg is dropped from 3 point 0 meters. The egg is moving at 4.4 meters per second right before it hits the ground. The egg comes to a stop in 0 point 0 7 2 seconds. What is the magnitude of force that the ground exerted on the egg?

A
13 cap n
B
0 point 6 6 cap n
C
9 point 2 cap n
D
180 cap n

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