# Semester 1 Post Test

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| By Genny Abernathy
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Genny Abernathy
Community Contributor
Quizzes Created: 2 | Total Attempts: 185
Questions: 51 | Attempts: 99  Settings  .

• 1.

### What does B represent?

• A.

Amplitude

• B.

Crest

• C.

Trough

• D.

Wavelength

C. Trough
Explanation
B represents the lowest point of a wave, which is called the trough. In a wave, the trough is the point where the displacement of the medium or the wave is at its minimum or lowest value. It is opposite to the crest, which is the highest point of the wave. The amplitude of a wave represents the maximum displacement from the equilibrium position, while the wavelength is the distance between two consecutive troughs or crests.

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• 2.

### As we move through the visible spectrum, red to violet (right to left in the image), the wavelength __________ and the frequency ____________.

• A.

Decreases; decreases

• B.

Decreases; increases

• C.

Increases; increases

• D.

Increases; decreases

B. Decreases; increases
Explanation
As we move through the visible spectrum from red to violet, the wavelength decreases. This is because red light has a longer wavelength compared to violet light. On the other hand, the frequency increases as we move from red to violet. This is because frequency and wavelength are inversely proportional to each other, so as the wavelength decreases, the frequency increases.

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• 3.

### What does D represent?

• A.

Amplitude

• B.

Crest

• C.

Trough

• D.

Wavelength

A. Amplitude
Explanation
The correct answer is amplitude. Amplitude refers to the maximum displacement or distance from the equilibrium position of a wave. It represents the intensity or strength of the wave, with larger amplitudes indicating greater energy. In this context, D represents the amplitude of the wave.

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• 4.

### Which of these waves can NOT travel through the vacuum of space?

• A.

Microwaves

• B.

• C.

Light waves

• D.

Sound waves

D. Sound waves
Explanation
Sound waves cannot travel through the vacuum of space because they require a medium, such as air or water, to propagate. Unlike microwaves, radio waves, and light waves, which are all forms of electromagnetic radiation and can travel through the vacuum of space, sound waves rely on the vibration of particles in a medium to transmit energy. In the absence of a medium in space, sound waves cannot propagate and therefore cannot be heard.

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• 5.

### You see lightning before you hear thunder because

• A.

Light waves can travel through a vacuum.

• B.

Sound waves cannot travel through the air.

• C.

Light waves travel faster than sound waves.

• D.

Sound waves travel faster than light waves.

C. Light waves travel faster than sound waves.
Explanation
Light waves travel faster than sound waves, which is why you see lightning before you hear thunder. Light waves can travel through a vacuum, such as in outer space, while sound waves require a medium, such as air, to travel through. The speed of light is much faster than the speed of sound, allowing light waves to reach our eyes before the sound waves reach our ears.

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• 6.

### While watching a recent science fiction movie, one Klingon spaceship blows up a Droid spaceship with a laser gun. The Klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. Scientifically, this scene is inaccurate because

• A.

Light can not reflect off objects in the vacuum of space.

• B.

They would not be able to see anything outside the window.

• C.

Lasers can not be transmitted through the vacuum of space.

• D.

The sound of the explosion would not be transmitted back to their ship.

D. The sound of the explosion would not be transmitted back to their ship.
Explanation
The scene is scientifically inaccurate because sound cannot travel through the vacuum of space. In space, there is no air or medium for sound waves to propagate, so the crew would not be able to hear the explosion.

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• 7.

### If we compare and contrast electromagnetic waves with sound waves, all BUT one statement is true. That is

• A.

Sound waves require a medium to travel while electromagnetic waves do not.

• B.

Electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere.

• C.

Electromagnetic waves can travel through the vacuum of space while sound waves cannot.

• D.

Sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

B. Electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere.
Explanation
The correct answer is "electromagnetic waves can travel through the vacuum of space while sound waves cannot." This statement is true because electromagnetic waves, such as light, can travel through empty space because they do not require a medium to propagate. On the other hand, sound waves are mechanical waves that require a medium, such as air, water, or solids, to travel. Therefore, sound waves cannot travel through the vacuum of space where there is no medium present.

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• 8.

### What is true for ALL of the examples of electromagnetic waves?

• A.

They all have the same energy.

• B.

They all have the same frequency.

• C.

They all have the same wavelength.

• D.

They all move at the same speed in a vacuum.

D. They all move at the same speed in a vacuum.
Explanation
All electromagnetic waves, regardless of their frequency or wavelength, travel at the same speed in a vacuum, which is the speed of light. This is a fundamental property of electromagnetic waves and is a consequence of the relationship between the electric and magnetic fields that make up these waves.

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• 9.

### All of the waves in the electromagnetic spectrum are _______ waves.

• A.

Transverse

• B.

Mechanical

• C.

Longitudinal

• D.

Compression

A. Transverse
Explanation
All of the waves in the electromagnetic spectrum are transverse waves. This means that the vibrations of the waves occur perpendicular to the direction of wave propagation. Unlike mechanical waves, such as sound waves, electromagnetic waves do not require a medium to travel through. They can propagate through empty space. Examples of electromagnetic waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

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• 10.

### Although you can see the pencil, it appears broken in the glass of water. This is because

• A.

Electromagnetic waves get closer together when they go through dense media like glass.

• B.

Electromagnetic waves compress more when they travel through denser media.

• C.

Electromagnetic waves travel at different speeds through different media.

• D.

Electromagnetic waves cannot travel through solids.

C. Electromagnetic waves travel at different speeds through different media.
Explanation
When light waves pass through different media, such as air and water, they can travel at different speeds. This change in speed causes the light waves to bend or refract. In the case of the pencil in the glass of water, the light waves from the pencil are refracted as they pass from the air into the water, causing the pencil to appear broken or distorted. This phenomenon is known as refraction and is due to the fact that electromagnetic waves travel at different speeds through different media.

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• 11.

### Reflection is the bouncing of light rays off of a surface. Which situation is NOT an example of reflection?

• A.

Looking at yourself in a mirror

• B.

Focusing light through a camera lens

• C.

Seeing an image of yourself in a still lake

• D.

Looking at your teacher at the front of the class

B. Focusing light through a camera lens
Explanation
Focusing light through a camera lens is not an example of reflection because it involves the refraction of light rather than its reflection. When light passes through a camera lens, it is bent or refracted in order to form an image on the camera sensor or film. Reflection, on the other hand, refers to the bouncing back of light rays from a surface without any change in their direction. In the other given situations, reflection is involved: looking at yourself in a mirror, seeing an image of yourself in a still lake, and looking at your teacher at the front of the class.

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• 12.

### Your teacher walks outside the classroom to have a conversation with the principal. Unknown to the teacher, while she is outside the room, the sound waves are transmitted around the edge of the door and spread out on the other side and you can hear the conversation. This is due to sound wave

• A.

Reflection.

• B.

Interference.

• C.

Diffraction.

• D.

Absorption.

C. Diffraction.
Explanation
When the sound waves encounter an obstacle or an edge, such as the door in this case, they undergo diffraction. Diffraction is the bending or spreading out of waves as they encounter an obstacle or pass through an opening. In this scenario, the sound waves bend around the edge of the door and spread out on the other side, allowing the conversation between the teacher and the principal to be heard. Reflection occurs when waves bounce off a surface, interference involves the interaction of multiple waves, and absorption refers to the process of waves being absorbed by a material. None of these options adequately explain the phenomenon described in the question.

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• 13.

### An echo is an example of sound wave

• A.

Diffraction.

• B.

Interference.

• C.

Refraction.

• D.

Reflection.

D. Reflection.
Explanation
An echo is an example of reflection because it is the sound wave bouncing off a surface and returning back to the source. Reflection occurs when a wave encounters a boundary or obstacle and is redirected back into the medium it came from. In the case of an echo, the sound wave reflects off a surface, such as a wall or a mountain, and travels back to the listener, creating a delayed repetition of the original sound. This phenomenon is a clear demonstration of reflection rather than diffraction, interference, or refraction.

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• 14.

### Houses with carpet are much quieter than houses with tile or hardwood floors because of sound wave

• A.

Absorption.

• B.

Diffraction.

• C.

reflection.

• D.

Refraction.

A. Absorption.
Explanation
Carpeted floors are known for their ability to absorb sound waves, reducing the amount of noise that is transmitted through the floor. This is due to the soft and porous nature of carpets, which allows them to trap and dampen sound vibrations. In contrast, tile or hardwood floors tend to reflect sound waves, causing them to bounce off the surface and create echoes or reverberations. Therefore, the correct answer is absorption, as carpets effectively absorb sound waves and contribute to a quieter environment in houses.

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• 15.

### We can see because light is

• A.

Absorbed.

• B.

Diffracted.

• C.

Reflected.

• D.

Refracted.

C. Reflected.
Explanation
When we see, light is reflected off the objects and enters our eyes. This reflection allows us to perceive the objects and their colors. Absorption refers to the light being absorbed by an object, which would not allow us to see it. Diffraction refers to the bending of light around obstacles, which can affect the direction of light but not necessarily our ability to see. Refraction refers to the bending of light as it passes through different mediums, such as water or glass, but it does not explain our ability to see. Therefore, the correct answer is reflected.

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• 16.

### In which medium would sound travel the fastest?

• A.

Across a room

• B.

In a swimming pool

• C.

Through outer space

• D.

Explanation
Sound travels fastest through a solid medium because the particles in a solid are close together and can transmit vibrations more efficiently. In this case, a railroad track is made of metal and is a solid medium, allowing sound waves to travel quickly through it.

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• 17.

### What does the person in back of the ambulance experience?

• A.

A lower frequency of the siren and therefore, a lower pitch

• B.

A lower amplitude of the siren and therefore, a softer sound

• C.

A higher frequency of the siren and therefore, a higher pitch

• D.

A higher amplitude of the siren and therefore, a louder sound

A. A lower frequency of the siren and therefore, a lower pitch
Explanation
As the ambulance moves away from the person, the sound waves emitted by the siren get stretched out, resulting in a lower frequency. Since pitch is directly related to frequency, the person in the back of the ambulance will perceive a lower pitch. This is known as the Doppler effect, where the perceived frequency of a sound changes depending on the relative motion between the source of the sound and the observer.

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• 18.

### Sunlight is slowed MOST when traveling through

• A.

A vacuum.

• B.

The atmosphere.

• C.

Water.

• D.

None of these, as light always travels at the same speed.

C. Water.
Explanation
Sunlight is slowed the most when traveling through water. This is because water has a higher refractive index compared to air or vacuum. When light enters a denser medium like water, it slows down and changes direction due to refraction. The refractive index of water is higher than that of air or vacuum, causing sunlight to slow down the most when passing through water.

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• 19.

### As the ambulance got closer, Marge noticed that the pitch of the siren got higher. This happened because of

• A.

The Resonance.

• B.

The Doppler Effect.

• C.

The Theory of Relativity.

• D.

Wave interference.

B. The Doppler Effect.
Explanation
The correct answer is the Doppler Effect. The Doppler Effect refers to the change in frequency or pitch of a sound wave as the source of the sound moves relative to the observer. In this case, as the ambulance got closer to Marge, the pitch of the siren appeared to get higher. This is because the sound waves from the siren were compressed, resulting in a higher frequency and pitch. The Doppler Effect is commonly observed with moving vehicles or sirens and is used in various applications, such as radar and sonar systems.

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• 20.

### A train whistle is at a higher pitch (note) as it approaches you and then drops to a lower pitch as it moves away. What concept explains this change or shift in sound waves?

• A.

Bernoulli effect

• B.

Changes in speed

• C.

Changes in speed

• D.

Doppler Effect

D. Doppler Effect
Explanation
The Doppler Effect explains the change in pitch of a train whistle as it approaches and moves away. When the train is approaching, the sound waves are compressed, resulting in a higher pitch. As the train moves away, the sound waves are stretched, causing a lower pitch. This phenomenon occurs due to the relative motion between the source of the sound (the train) and the observer (the person hearing the whistle).

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• 21.

### A generator converts mechanical energy into _____________________ energy.

• A.

Chemical

• B.

Electrical

• C.

Light

• D.

Sound

B. Electrical
Explanation
A generator is a device that converts mechanical energy, such as the rotation of a turbine or engine, into electrical energy. This is achieved through the principles of electromagnetic induction, where a magnetic field is created by the mechanical energy and then passed through a coil of wire, inducing an electric current. Therefore, the correct answer is electrical energy.

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• 22.

### When gasoline is burned in a car engine, ________ energy is converted into _________ energy.

• A.

Heat, chemical

• B.

Chemical, potential

• C.

Mechanical, chemical

• D.

Chemical, mechanical

D. Chemical, mechanical
Explanation
When gasoline is burned in a car engine, the chemical energy stored in the gasoline molecules is converted into mechanical energy. This conversion occurs through a series of chemical reactions, where the bonds between the atoms in the gasoline molecules are broken, releasing energy. This energy is then used to move the car's pistons, which in turn powers the vehicle's wheels and propels it forward.

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• 23.

### When a television is turned on, it converts electrical energy into many other forms of energy. Which set of words correctly lists MOST of these forms?

• A.

Sound and heat

• B.

Sound and light

• C.

Sound, light, and heat

• D.

Light, sound, and electricity

C. Sound, light, and heat
Explanation
When a television is turned on, it converts electrical energy into sound, light, and heat. The sound is produced by the speakers, the light is emitted by the screen, and heat is generated due to the electrical components and processes happening inside the television.

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• 24.

### The heat transfer depicted in the image is MOST likely

• A.

Circulation

• B.

Convection

• C.

Conduction

• D.

B. Convection
Explanation
The heat transfer depicted in the image is most likely convection because it shows the movement of a fluid, such as air or water, transferring heat. Convection occurs when a fluid is heated, becomes less dense, and rises, while the cooler fluid sinks and takes its place. This creates a continuous circulation of fluid, transferring heat from one area to another.

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• 25.

### The method of heat transfer by which the sun warms the earth is

• A.

Conduction

• B.

Solaration

• C.

• D.

Convection

Explanation
Radiation is the method of heat transfer by which the sun warms the earth. Radiation involves the transfer of heat through electromagnetic waves, such as infrared radiation, that travel through space. The sun emits these waves, which then travel through the vacuum of space and reach the earth's atmosphere. Once they reach the earth's surface, these waves are absorbed, causing the temperature to rise. This process is responsible for the warming of the earth by the sun.

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• 26.

### Warm air rises at the equator and cold air sinks at the poles creating

• A.

• B.

Hurricanes.

• C.

Convection currents.

• D.

The Coriolis effect.

C. Convection currents.
Explanation
Warm air rises at the equator and cold air sinks at the poles due to differences in temperature. This movement of air creates convection currents, which are large-scale circulation patterns in the atmosphere. These convection currents play a significant role in weather patterns and climate. Tornadoes and hurricanes are specific types of weather phenomena that can be formed as a result of convection currents, but the correct answer is convection currents themselves. The Coriolis effect, on the other hand, is a phenomenon caused by the rotation of the Earth that influences the direction of moving objects, including air masses.

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• 27.

### Thermal energy is transferred how?

• A.

Heat travels in both directions.

• B.

Heat travels from the hotter object to the cooler object.

• C.

Heat travels from the cooler object to the hotter object.

• D.

Heat does not travel between objects of different temperatures.

C. Heat travels from the cooler object to the hotter object.
Explanation
Heat always travels from a hotter object to a cooler object due to the difference in temperature. This is because heat energy tends to move from regions of higher temperature to regions of lower temperature in order to achieve thermal equilibrium. This process is known as heat transfer by conduction.

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• 28.

### The mass of all bicycles and riders indicated in the graph are equal. What indicates the order of their average velocity from greatest to least?

• A.

B, C, A, D

• B.

D, B, C, A

• C.

C, A, D, B

• D.

A, D, C, B

D. A, D, C, B
Explanation
The correct order of average velocity from greatest to least is A, D, C, B. This is because the graph indicates that the mass of all bicycles and riders is equal. Therefore, the average velocity can be determined by comparing the lengths of the lines on the graph. Line A is the longest, indicating the greatest average velocity. Line D is the second longest, indicating the second greatest average velocity. Line C is shorter than both A and D, indicating the third greatest average velocity. Line B is the shortest, indicating the least average velocity.

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• 29.

### If your friend said that kinetic energy was changing to potential energy at point C, how would you respond?

• A.

• B.

Your friend is incorrect, at this point, the cannon ball just has kinetic energy.

• C.

Your friend is incorrect, at this point, the cannon ball just has potential energy.

• D.

Your friend is incorrect, at this point, the cannon ball is converting kinetic to potential energy.

C. Your friend is incorrect, at this point, the cannon ball just has potential energy.
Explanation
The correct answer is "Your friend is incorrect, at this point, the cannon ball just has potential energy." This is because at point C, the cannonball is at its highest point in its trajectory, where it has maximum potential energy and minimum kinetic energy. As it falls back down, potential energy is converted into kinetic energy.

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• 30.

### A ball is projected into the air. Describe the change(s) in potential and kinetic energy.

• A.

Potential energy decreases and kinetic energy increases.

• B.

Kinetic energy increases and potential energy decreases.

• C.

Potential energy decreases while kinetic energy increases; then kinetic energy decreases and potential energy increases.

• D.

Kinetic energy decreases as potential energy increases; once at the top, potential energy decreases as kinetic energy increases.

D. Kinetic energy decreases as potential energy increases; once at the top, potential energy decreases as kinetic energy increases.
Explanation
As the ball is projected into the air, it gains height and therefore its potential energy increases. At the same time, the ball loses speed and its kinetic energy decreases. Once the ball reaches its highest point, its potential energy is at its maximum while its kinetic energy is at its minimum. As the ball starts falling back down, its potential energy decreases while its kinetic energy increases again. Therefore, the correct answer is "Kinetic energy decreases as potential energy increases; once at the top, potential energy decreases as kinetic energy increases."

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• 31.

### Instead of rolling down the ramp over the step, imagine the ball falls off the back of the ramp directly to the ground. What is the amount of potential energy remaining after the ball lands on the ground?

• A.

0 J

• B.

25 J

• C.

50 J

• D.

100 J

A. 0 J
Explanation
When the ball falls off the back of the ramp directly to the ground, it loses all of its potential energy because potential energy is dependent on the height of an object above the ground. Since the ball is now on the ground, its height is zero and therefore it has no potential energy remaining.

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• 32.

### In this scenario a battery is used to supply chemical potential energy. The potential energy is transformed and produces kinetic energy. The battery causes a fan to spin and that kinetic energy can also be described as mechanical energy. Check out the values for each: 100 J potential energy results in 75 J of kinetic energy. What conclusion can be drawn from the energy transformation diagram?

• A.

Not all of the chemical potential energy is converted; 25 J remains as potential energy.

• B.

The energy transformation results in 25 J of energy being lost.

• C.

The chemical potential energy is transformed into 75 J of kinetic energy and 25 J of heat energy.

• D.

The 100 J of chemical potential energy releases as 75 J of mechanical energy and 25 J is destroyed.

C. The chemical potential energy is transformed into 75 J of kinetic energy and 25 J of heat energy.
Explanation
From the energy transformation diagram, it can be concluded that the chemical potential energy is transformed into 75 J of kinetic energy and 25 J of heat energy. This means that not all of the chemical potential energy is converted, and 25 J remains as potential energy in the form of heat.

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• 33.

### Based on the diagram of a ball rolling down hill, what statement is true?

• A.

The ball in box C has less kinetic energy than ball in box B.

• B.

The ball in box A has less kinetic energy than the ball in box B.

• C.

The ball in box C has less kinetic energy than the ball in box D.

• D.

The ball in box A has equal amounts of potential and kinetic energy.

B. The ball in box A has less kinetic energy than the ball in box B.
Explanation
In the diagram, the ball in box A is at a higher position on the hill compared to the ball in box B. Since kinetic energy is directly proportional to the speed and mass of an object, and both balls have the same mass, the ball in box B, which is at a lower position, will have a higher speed and therefore more kinetic energy than the ball in box A.

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• 34.

### Which area of this sound wave represents a compression?

• A.

A

• B.

B

• C.

C

• D.

D & E

C. C
Explanation
Area C represents a compression in a sound wave. A compression is a region where the particles of the medium are densely packed together, resulting in a higher pressure and density. In this area, the particles are close together and have a higher amplitude, indicating a higher pressure compared to other regions of the wave.

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• 35.

### Identify the characteristic of a transverse wave that doubled from wave A to wave B.

• A.

Amplitude

• B.

Crest

• C.

Trough

• D.

Wavelength

A. Amplitude
Explanation
The characteristic of a transverse wave that doubled from wave A to wave B is the amplitude. Amplitude refers to the maximum displacement of particles in a wave from their equilibrium position. In this case, the amplitude of wave B is twice as large as the amplitude of wave A.

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• 36.

### The picture lists light waves from left to right in order of highest to lowest energy. Which region of the electromagnetic spectrum has the longest wavelength?

• A.

UV

• B.

Gamma Rays

• C.

Visible Light

• D.

Explanation
Radio waves have the longest wavelength in the electromagnetic spectrum. This is because wavelength and energy are inversely proportional, so as wavelength increases, energy decreases. UV and gamma rays have shorter wavelengths and higher energy, while visible light falls in the middle. Therefore, radio waves, with their longer wavelengths, have the lowest energy among the given options.

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• 37.

### On a cool, still autumn morning, Carol noticed that she could see the exact image of the trees surrounding the pond. She could even distinguish between the red and yellow leaves on the trees while she looked into the pond at the trees' mirror images. How did the pond provide Carol with these exact color images?

• A.

The light waves were refracted and the bending produced colors.

• B.

The colored leaves emitted different wavelengths that Carol saw in the water.

• C.

The different colors of the leaves were absorbed by the water, producing the color reflections.

• D.

The different colored leaves reflected different wavelengths which Carol saw reflected from the pond.

D. The different colored leaves reflected different wavelengths which Carol saw reflected from the pond.
Explanation
The pond provided Carol with exact color images because the different colored leaves reflected different wavelengths, which were then seen as color reflections in the pond.

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• 38.

### Comparing Wave A (black) to Wave B (green), Wave A has a

• A.

Higher crest.

• B.

Higher frequency.

• C.

Longer wavelength.

• D.

Greater amplitude.

C. Longer wavelength.
Explanation
Wave A is compared to Wave B in terms of its crest, frequency, wavelength, and amplitude. The correct answer is "longer wavelength." This means that Wave A has a greater distance between two consecutive crests or troughs compared to Wave B. The other options are incorrect because they do not accurately describe the comparison between the two waves.

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• 39.

### Compare the sounds produce by wave A and wave B. The human ear would hear

• A.

Wave A as a louder sound than wave B.

• B.

Wave A as a higher pitched sound than wave B.

• C.

Wave A and B with the same pitch, but wave A as louder.

• D.

Wave B has a louder and higher pitched sound than wave A.

A. Wave A as a louder sound than wave B.
Explanation
Wave A is perceived as a louder sound than wave B. This means that when both waves are heard by the human ear, wave A will be perceived as having a higher volume or intensity compared to wave B. The question does not mention anything about pitch, only the loudness of the sound produced by the waves.

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• 40.

### Teachers can hear students shouting in the stairwells without seeing them. The bending of sound as it goes around a barrier is called

• A.

Diffraction.

• B.

Reflection.

• C.

Refraction.

• D.

Transmission.

A. Diffraction.
Explanation
Diffraction is the correct answer because it refers to the bending of sound waves as they encounter an obstacle or barrier, such as the walls of a stairwell. This bending allows the sound to spread out and reach the ears of the teachers, even if they cannot directly see the students. Reflection refers to the bouncing of sound waves off a surface, refraction refers to the bending of sound waves as they pass through different mediums, and transmission refers to the passage of sound waves through a medium without being reflected or absorbed. However, in this scenario, it is the diffraction of sound that allows the teachers to hear the students shouting.

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• 41.

### A concave lens has an inward curved shape. It refracts light outward from the lens. The light rays spread apart as they exit the lens. Which represents a concave lens?

• A.

A

• B.

B

• C.

A and B

• D.

Neither A nor B

B. B
Explanation
Option B represents a concave lens because it has an inward curved shape, which is characteristic of a concave lens. The inward curve causes the light rays to diverge or spread apart as they exit the lens, which is also a property of a concave lens. Therefore, option B is the correct representation of a concave lens.

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• 42.

### How do charges behave? Choose each correct answer.

• A.

Like charges attract

• B.

Like charges repel

• C.

Opposite charges attract

• D.

Charges are caused by the transfer of protons.

B. Like charges repel
C. Opposite charges attract
Explanation
Like charges repel because they have the same charge and therefore exert a force pushing them away from each other. Opposite charges attract because they have different charges and therefore exert a force pulling them towards each other. Charges are not caused by the transfer of protons; they can be caused by the transfer of electrons as well.

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• 43.

### Looking at the picture, in which way were the electrons transferred?

• A.

Friction

• B.

Conduction

• C.

Induction

• D.

Current

A. Friction
Explanation
Based on the given picture, the most likely explanation for the transfer of electrons is friction. Friction occurs when two objects rub against each other, causing the transfer of electrons from one object to another. This transfer of electrons creates a build-up of electric charge, leading to the phenomenon of static electricity.

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• 44.

### Looking at the picture, in which way were the electrons transferred?

• A.

Friction

• B.

Conduction

• C.

Induction

• D.

Current

B. Conduction
Explanation
Conduction is the transfer of electrons from one object to another through direct contact. In this case, looking at the picture, we can see that there is a direct contact between two objects, suggesting that the electrons were transferred through conduction.

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• 45.

### Looking at the picture, in which way were the electrons transferred?

• A.

Friction

• B.

Conduction

• C.

Induction

• D.

Current

C. Induction
Explanation
Based on the information provided, it is not possible to determine how the electrons were transferred by simply looking at a picture. The concept of induction involves the transfer of charge through the influence of an electric field, typically without direct contact between objects. However, without additional context or details, it is not possible to definitively conclude that induction was the method of electron transfer in this particular scenario.

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• 46.

### Which type of circuit is shown?

• A.

Parallel

• B.

Series

• C.

Static

• D.

Current

A. Parallel
Explanation
The circuit shown in the question is a parallel circuit. In a parallel circuit, the components are connected in such a way that there are multiple paths for the current to flow. Each component is connected across the same voltage source, and the voltage across each component is the same. In this circuit, the components are connected side by side, allowing the current to divide and flow through each component independently.

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• 47.

### Which type of circuit is shown?

• A.

Parallel

• B.

Series

• C.

Static

• D.

Current

B. Series
Explanation
The type of circuit shown is series. In a series circuit, the components are connected in a single path, where the current flows through each component in succession. In this circuit, the components are connected one after the other, forming a series connection.

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• 48.

### The area surrounding a magnet where it exerts a magnetic force is called

• A.

Magnetic force

• B.

Domain

• C.

Magnetic field

• D.

Aurora borealis

C. Magnetic field
Explanation
The area surrounding a magnet where it exerts a magnetic force is called a magnetic field. This field is created by the movement of charged particles within the magnet and extends outwards in all directions. Other magnets or magnetic objects placed within this field will experience a force of attraction or repulsion. The strength and direction of the magnetic field can be represented by magnetic field lines, which show the path a small north pole would take if placed in the field.

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• 49.

### How could you change the strength of a simple electromagnet?

• A.

Change the number of coils, change the strength of the battery, change the type of wire used

• B.

Change the number of coils, change the battery to a magnet, change the size of the iron core

• C.

Change the number of coils, change the strength of the battery, change the iron core to a silver one.

• D.

Change the number of coils, change the strength of the battery, change the size of the iron core

D. Change the number of coils, change the strength of the battery, change the size of the iron core
Explanation
To change the strength of a simple electromagnet, you can change the number of coils, the strength of the battery, and the size of the iron core. Increasing the number of coils will increase the magnetic field produced by the electromagnet. Increasing the strength of the battery will increase the current flowing through the coils, thereby increasing the magnetic field. Changing the size of the iron core will also affect the strength of the magnetic field, as a larger core will have more magnetic material to interact with the coils.

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• 50.

### Mayra has just completed her experiment to see how much mass a wooden bar can support. The data she collected is shown in the data table. Now she wants to make a graph for the data she’s collected, but she’s not sure how to set it up. Mayra asks her lab partners, and gets suggestions. Whose advice should she follow?

• A.

Dolly

• B.

Peter

• C.

Sylvester

• D.

Wilbur Back to top