# Light, Sound And Electricity - Diagnostic Test

23 Questions | Total Attempts: 188  Settings  • 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

• 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

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