# Light, Sound And Electricity - Diagnostic Test

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Quizzes Created: 6 | Total Attempts: 13,762
Questions: 23 | Attempts: 252

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• 1.

### In a sound wave diagram, what would be the value to look at to tell the difference between a low pitch and a high pitch?

• A.

The amplitude of the wave

• B.

The frequency of the wave

• C.

The wavelength of the wave

• D.

The height of the wave

C. The wavelength of the wave
Explanation
The wavelength of a sound wave refers to the distance between two consecutive points of similar phase, such as two crests or two troughs. In the context of pitch, a low pitch corresponds to a longer wavelength, while a high pitch corresponds to a shorter wavelength. Therefore, looking at the wavelength of the wave can help determine the difference between a low pitch and a high pitch.

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• 2.

### Kyle sees a flash of light and 3.5 seconds later the sound of the thunder reaches his ears. How far away from Kyle did the lightening strike the ground?

• A.

1.16 km

• B.

1250 m

• C.

94 m

• D.

1.25 km

A. 1.16 km
Explanation
The speed of sound is approximately 343 meters per second. Since Kyle hears the sound of thunder 3.5 seconds after seeing the flash of light, we can calculate the distance by multiplying the speed of sound by the time it takes for the sound to reach him. Therefore, the distance is 343 meters/second * 3.5 seconds = 1200.5 meters, which is approximately 1.2 kilometers. Therefore, the correct answer is 1.16 km.

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• 3.

### A beam of light is situated 25cm away from a glass jar filled with water. The light beam bends away from the normal twice. Complete the following sentence.This property is known as _______, and the light bends once when it passes through the _______ and again when it passes through the _______.

• A.

Reflection, glass, water

• B.

Refraction, air, water

• C.

Reflection, air, glass

• D.

Refraction, glass, water

D. Refraction, glass, water
Explanation
When light passes from one medium to another, it changes its direction due to the change in speed. This phenomenon is called refraction. In this case, the light beam bends away from the normal twice, indicating that it undergoes refraction twice. The first refraction occurs when the light beam passes from air (or vacuum) into the glass jar, and the second refraction occurs when it passes from the glass jar into the water.

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• 4.

### Red light is reflected off of a convex mirror. The resulting, reflected light rays ...

• A.

Converge

• B.

Diverge

• C.

Focalise

• D.

None of the answers provided are correct

B. Diverge
Explanation
When red light is reflected off of a convex mirror, the resulting, reflected light rays diverge. This means that the rays spread out and move away from each other. Convex mirrors are curved outward, causing the light rays to reflect in such a way that they diverge. This is why convex mirrors are often used for wide-angle views and to see a larger area. The other options, converge and focalise, are not correct because they describe the behavior of light rays when reflected off of a concave mirror, which is curved inward.

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• 5.

### *A light beam is directed through a concave lens, then a convex lens. The resulting light beams will be...    (draw a picture to see if it will help)

• A.

Converging

• B.

Diverging

• C.

Parallel

• D.

None of the answers are correct

C. Parallel
Explanation
When a light beam passes through a concave lens, it diverges or spreads out. However, when it then passes through a convex lens, it converges or comes together. Therefore, the resulting light beams will be parallel, as the converging effect of the convex lens cancels out the diverging effect of the concave lens.

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• 6.

### As the width of a convex lens increases, the length to the point of focus ...

• A.

Decreases

• B.

Increases

• C.

Stays the same

• D.

None of the options are correct

A. Decreases
Explanation
As the width of a convex lens increases, the lens becomes more curved. This increased curvature causes the light rays passing through the lens to converge at a point closer to the lens, resulting in a shorter length to the point of focus. Therefore, the length to the point of focus decreases as the width of the convex lens increases.

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• 7.

### Three marbles, Red, Blue, and Yellow, are placed inside a black box. A blue light then a white light then a purple light is turned on inside the box. In what order are the marbles seen?

• A.

Blue, all of them, blue and red

• B.

Blue, none of them, all of them

• C.

Blue, all of them, none of them

• D.

None of them, all of them, blue and red

• E.

Blue, none of them, none of them

• F.

Blue, none of them, blue and red

C. Blue, all of them, none of them
Explanation
The order in which the marbles are seen is Blue, all of them, none of them. This can be inferred from the sequence of lights turned on inside the box. The blue light is turned on first, indicating that the blue marble is seen. Then the white light is turned on, suggesting that all the marbles are seen. Finally, the purple light is turned on, indicating that none of the marbles are seen.

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• 8.

### If a series circuit is set up for a set of Christmas tree lights and one of the bulbs blow what happens and why?

• A.

One bulb will stop working, because that bulb will have lost its connection to the flow of electrons

• B.

Some bulbs will stop working, because some of the bulbs will have lost their connection to the flow of electrons

• C.

One bulb will stop working, because the circuit is interrupted to only the one broken bulb

• D.

All bulbs will stop working, because the circuit to all globes is interrupted

D. All bulbs will stop working, because the circuit to all globes is interrupted
Explanation
If a series circuit is set up for a set of Christmas tree lights and one of the bulbs blow, all bulbs will stop working because the circuit to all globes is interrupted. In a series circuit, the current flows through each component in the circuit, and if one component fails, the circuit is broken and the current cannot reach the other components. Therefore, when one bulb blows, the circuit is interrupted and the current cannot flow through any of the bulbs, causing all of them to stop working.

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• 9.

### Why can sound travel through a vacuum?

• A.

It can't, because sound is caused by vibration and it needs a medium to pass through

• B.

Because sound is caused by vibration and a vacuum contains a medium to pass through

• C.

It can't, because sound is a mechanical wave which creates pressure and displacement and air inside a vacuum is stationary

• D.

Because sound is a mechanical wave which creates pressure and displacement of the stationary air inside a vacuum

A. It can't, because sound is caused by vibration and it needs a medium to pass through
Explanation
Sound is a mechanical wave that requires a medium, such as air, water, or solids, to propagate. In a vacuum, there is an absence of any medium, making it impossible for sound to travel. Without particles to vibrate and transmit the sound waves, there is no way for sound to propagate through a vacuum.

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• 10.

### The human eye being able to see colours is a result of

• A.

The four colour cones in the eye sending light sensitive impulses to the brain

• B.

Coloured light being absorbed by an object

• C.

Coloured light being reflected by an object

• D.

The four colour cones in the eye sending colour sensitive impulses to the brain

C. Coloured light being reflected by an object
Explanation
The human eye is able to see colors because when light falls on an object, some wavelengths are absorbed by the object and others are reflected. The reflected light then enters the eye and stimulates the four color cones present in the retina. These cones are sensitive to different wavelengths of light, allowing us to perceive different colors. The cones send these color-sensitive impulses to the brain, which processes the information and enables us to see and distinguish various colors.

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• 11.

### Seeing a rainbow is the result of...

• A.

White light refracting through a water droplet

• B.

Different coloured lights refracting through a water droplet

• C.

White light reflecting off a water droplet

• D.

Different coloured lights reflecting off a water droplet

A. White light refracting through a water droplet
Explanation
When white light passes through a water droplet, it bends or refracts, causing the different colors in the light spectrum to separate. This separation of colors creates a rainbow. Therefore, seeing a rainbow is the result of white light refracting through a water droplet.

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• 12.

### Light bending away from the normal is typically used in an explanation of what happens to a light ray in ...

• A.

Reflection

• B.

Refraction

• C.

Convergence

• D.

Divergence

B. Refraction
Explanation
When light passes from one medium to another, it changes direction due to the change in its speed. Refraction occurs when light bends away from the normal (an imaginary line perpendicular to the surface) as it enters a medium with a higher refractive index. This change in direction is responsible for various phenomena, such as the bending of a pencil in a glass of water. Therefore, the correct answer is refraction.

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• 13.

### What happens to the light rays passing through a concave lens with the width of the lens is increased?

• A.

They move further apart

• B.

They move closer together

• C.

The focal length increases

• D.

The focal length decreases

A. They move further apart
Explanation
When the width of a concave lens is increased, the light rays passing through it will move further apart. This is because a concave lens causes light rays to diverge or spread out. By increasing the width of the lens, the effect of divergence on the light rays is amplified, causing them to move further apart.

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• 14.

### The intensity of sound is measure in decibels (dB). The intensity of the sound of a guitar is 80 dB. If the same guitar is played at the same time (two guitars are played) what would happen to the decibel reading?

• A.

Stay the same

• B.

Decrease

• C.

Increase

• D.

There is no way to tell how the decibels would change

C. Increase
Explanation
When two guitars are played at the same time, the sound waves from each guitar combine and create a louder sound. This increase in sound intensity leads to an increase in the decibel reading. Therefore, the correct answer is "increase".

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• 15.

### Which of the following is correct about current and voltage?

• A.

As voltage decreases current increases

• B.

Voltage is electrical force and current is the rate of electron flow

• C.

Voltage is dependant upon currrent

• D.

Voltage creates electrical current, and current is a measure of electrical current force

B. Voltage is electrical force and current is the rate of electron flow
Explanation
The correct answer is "voltage is electrical force and current is the rate of electron flow." Voltage refers to the electrical force that pushes electrons through a circuit, while current refers to the rate at which these electrons flow. This means that when voltage increases, current also increases, and vice versa.

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• 16.

### Which of the following is correct about resistance?

• A.

As resistance increases, the current decreases and voltage remains the same

• B.

As resistance increases, the current increases and the voltage remains the same

• C.

Resistance is a measure of the amount of current that does not flow through a circuit

• D.

Resistance is a measure of a substances ability to improve the current flow through a circuit

A. As resistance increases, the current decreases and voltage remains the same
Explanation
As resistance increases, the current decreases and voltage remains the same. This is because resistance opposes the flow of current in a circuit. As resistance increases, it becomes harder for the current to flow, leading to a decrease in current. However, according to Ohm's Law, voltage (V) is equal to current (I) multiplied by resistance (R). Since the voltage source remains constant, an increase in resistance would result in a decrease in current to maintain the equation balanced. Therefore, the current decreases while the voltage remains the same.

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• 17.

### Light passes through a lens in the human eye and is projected onto the retina of the eye where the image in processes. What is true about this process?

• A.

The lens is convex, and the image is projected onto the retina smaller and upside down

• B.

The lens is concave, and the image is projected onto the retina larger and right way up

• C.

The lens is convex, and the image is projected onto the retina larger and upside down

• D.

The lens is concave, and the image is projected on to the retina smaller and upside down

A. The lens is convex, and the image is projected onto the retina smaller and upside down
Explanation
The lens in the human eye is convex, meaning it is thicker in the middle and thinner at the edges. This convex lens causes light rays to converge, or come together, as they pass through it. As a result, the image formed on the retina is smaller than the actual object being viewed. Additionally, due to the way the lens refracts light, the image is also projected upside down on the retina.

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• 18.

### Kasey is wearing blue tinted glasses. What are the main colours of visible light that her glasses absorb or block?

• A.

Blue and red

• B.

Blue, green and yellow

• C.

Red and purple

• D.

Purple and green

• E.

Non of the options are correct

C. Red and purple
Explanation
Kasey's blue tinted glasses absorb or block the colors red and purple. This means that when light passes through the glasses, the red and purple wavelengths are not transmitted, resulting in these colors being absorbed or blocked by the glasses.

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• 19.

### Kasey is wearing blue tinted glasses. What colour will her eyes predominantly see and why?

• A.

Kasey will see red because the lens absorbs blue light and reflects reds and purples

• B.

Kasey will see blue because the lens absorbes reds and purples and lets blue light pass through it

• C.

Kasey will see blue because the lens absorbs blue light making everything appear blue

• D.

Kasey will see red because the lens absorbs red light making everything appear red

B. Kasey will see blue because the lens absorbes reds and purples and lets blue light pass through it
Explanation
The correct answer is that Kasey will see blue because the lens absorbs reds and purples and lets blue light pass through it. The blue tinted glasses work by filtering out certain wavelengths of light, specifically reds and purples, while allowing blue light to pass through. This means that when Kasey wears these glasses, the red and purple colors will be absorbed by the lens, while the blue light will reach her eyes, resulting in a predominantly blue perception of her surroundings.

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• 20.

### A cat can hear sounds up to 70,000 Hz. Bats send and receive ultra-high squeaks of up to 120,000 Hz. Which animal hears sound of shorter wavelengths, cats or bats?

• A.

Cats, because lower Hz means shorter wavelenths

• B.

Bats, because higher Hz means longer wavelengths

• C.

Cats, because lower frequency means shorter wavelength

• D.

Bats, because higher frequency means shorter wavelength

D. Bats, because higher frequency means shorter wavelength
Explanation
Bats hear sound of shorter wavelengths compared to cats because higher frequency means shorter wavelength.

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• 21.

### The loudness and pitch of a sound being transmitted increases. Which of the following is true?

• A.

The amplitude increases and the wavelength increases

• B.

The amplitude decreases and the wavelength decreases

• C.

The amplitude decreases and the wavelength increases

• D.

The amplitude increases and the wavelength decreases

D. The amplitude increases and the wavelength decreases
Explanation
When the loudness and pitch of a sound being transmitted increases, it means that the sound becomes louder and higher in frequency. In terms of wave properties, loudness is directly related to the amplitude of the wave, so as the loudness increases, the amplitude also increases. Pitch, on the other hand, is related to the wavelength of the wave. Higher pitch corresponds to a shorter wavelength, so as the pitch increases, the wavelength decreases. Therefore, the correct answer is that the amplitude increases and the wavelength decreases.

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• 22.

### ** Explain what you must do to lower the pitch of a note played on a single guitar string by altering the length of the string

• A.

The string needs to be made longer

• B.

The string needs to be made shorter

• C.

The strings length does not need to be changed

• D.

Changing the length of the string will not change the pitch

A. The string needs to be made longer
Explanation
When altering the length of a guitar string, the pitch of the note played on that string will change. According to the answer, the string needs to be made longer in order to lower the pitch. This is because the longer the string, the lower the frequency of the vibrations produced when the string is plucked, resulting in a lower pitch.

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• 23.

### Why do tuning forks with long prongs vibrate at a lower frequency (lower tones) than short-tuned forks? Hint: longer tuning forks are slightly heavier.

• A.

More weight means less vibrations which means smaller wavelength

• B.

More weight means more vibration which means smaller wavelengths

• C.

More weight means less vibration which means larger wavelengths

• D.

More weight means more vibration which means larger wavelengths

C. More weight means less vibration which means larger wavelengths
Explanation
The answer is "more weight means less vibration which means larger wavelengths." This is because the frequency of a vibrating object is inversely proportional to its mass. Therefore, a tuning fork with longer prongs, which are slightly heavier, will vibrate at a lower frequency (lower tones) compared to a tuning fork with shorter prongs. This lower frequency corresponds to larger wavelengths.

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• Current Version
• Mar 19, 2023
Quiz Edited by
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• May 27, 2015
Quiz Created by
Amy001k

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