Year 9 Science - Heat And Sound
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Questions and Answers
- 1.
Your hand feels cold as an ice-block melts on it. Identify the correct explanation for this process.
- A.
Heat has transferred from the ice-block into your hand by conduction.
- B.
Heat has transferred from your hand to the ice-block by conduction.
- C.
Heat has transferred from the ice-block into your hand by radiation.
- D.
Heat has transferred from your hand to the ice-block by radiation.
Correct Answer
B. Heat has transferred from your hand to the ice-block by conduction.Explanation
When an ice-block melts on your hand, the heat is transferred from your hand to the ice-block by conduction. Conduction is the process of heat transfer through direct contact between two objects. In this case, the heat from your hand is conducted to the ice-block, causing it to melt.Rate this question:
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- 2.
Select the alternative that lists insulators from the most to the least effective.
- A.
A cotton T-shirt, a cotton windcheater, a woollen jumper, a parka
- B.
A windcheater, a cotton T-shirt, a woollen jumper, a parka
- C.
A parka, a woollen jumper, a cotton windcheater, a cotton T-shirt
- D.
A woollen jumper, a cotton windcheater, a parka, a cotton T-shirt
Correct Answer
C. A parka, a woollen jumper, a cotton windcheater, a cotton T-shirtExplanation
The given answer is correct because a parka is the most effective insulator, followed by a woollen jumper, a cotton windcheater, and a cotton T-shirt. Insulators work by trapping air and preventing heat transfer. A parka, being a thick and heavily insulated outerwear, is the most effective at trapping air and keeping the body warm. A woollen jumper is also a good insulator due to the natural properties of wool. A cotton windcheater provides some insulation but not as much as a woollen jumper. A cotton T-shirt is the least effective insulator as it does not provide much insulation.Rate this question:
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- 3.
Sound is a longitudinal wave. This means that its particles:
- A.
Vibrate back and forth
- B.
Move along with the wave
- C.
Vibrate from side to side
- D.
Do not move at all
Correct Answer
A. Vibrate back and forthExplanation
Sound is a longitudinal wave, which means that its particles vibrate back and forth. This type of wave consists of compressions and rarefactions, where the particles in the medium oscillate parallel to the direction of the wave's propagation. As sound travels through a medium, such as air or water, the particles of the medium vibrate in a back and forth motion, creating the sensation of sound. Therefore, the correct answer is that the particles of sound vibrate back and forth.Rate this question:
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- 4.
The sound of a flute is produced because:
- A.
Air vibrates as it enters the mouthpiece.
- B.
The air around each hole in the flute vibrates.
- C.
Your fingers vibrate as they cover specific holes.
- D.
Different-sized columns of air inside the flute vibrate.
Correct Answer
D. Different-sized columns of air inside the flute vibrate.Explanation
The correct answer is that different-sized columns of air inside the flute vibrate. When a flute is played, air is blown across the edge of the mouthpiece, creating a stream of air. This stream of air then enters the flute and encounters different-sized columns of air, which are created by the various holes and keys on the flute. As the air passes through these different-sized columns, it causes the air inside the flute to vibrate at different frequencies, producing different notes and creating the sound of the flute.Rate this question:
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- 5.
An ultrasound pulse is reflected from a shark that is swimming 750 metres below the water surface. Given that the speed of sound in water is 1500 metres per second, the time delay between sending and receiving this pulse is:
- A.
0.5 seconds
- B.
1 second
- C.
2 seconds
- D.
3 seconds
Correct Answer
B. 1 secondExplanation
The time delay between sending and receiving the ultrasound pulse can be calculated by dividing the distance traveled by the speed of sound in water. In this case, the distance traveled is 750 meters and the speed of sound in water is 1500 meters per second. Therefore, the time delay is 750/1500 = 0.5 seconds. However, the question asks for the time delay between sending and receiving the pulse, which means we need to consider the round trip time. So, the actual time delay is twice the one calculated, which is 2 * 0.5 = 1 second.Rate this question:
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- 6.
The part of the ear that provide us with our sense of balance is the:
- A.
Semi-circular canals
- B.
Eustachian tube
- C.
Oval window
- D.
Pinna
Correct Answer
A. Semi-circular canalsExplanation
The semi-circular canals are responsible for providing us with our sense of balance. These canals are located in the inner ear and are filled with fluid. When we move our head, the fluid in the canals moves as well, stimulating tiny hair cells that send signals to the brain about our body's position and movement. This information helps us maintain our balance and coordinate our movements. The Eustachian tube helps equalize pressure in the middle ear, the oval window transmits sound vibrations to the inner ear, and the pinna is the visible part of the ear that collects sound waves.Rate this question:
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- 7.
A pool blanket is used to trap heat within a pool to prevent the water from rapidly cooling down overnight. Four types of pool blanket were tested on identical pools. Each pool was heated to 28°C and at 5 p.m. each pool blanket was used to cover a pool. At 9 a.m. the following morning, the blankets were removed and the water temperature tested in each case. The results were as follows: Pool blanket Silverline Hot stuff Luxury liner Thermospecial Temperature at 9 a.m. (°C) 26 24 25.5 23.5 Which was the best insulator?
- A.
Silverline
- B.
Hot stuff
- C.
Luxury liner
- D.
Thermospecial
Correct Answer
A. SilverlineExplanation
The best insulator among the four types of pool blankets tested is Silverline. This can be inferred from the fact that the temperature at 9 a.m. when using the Silverline pool blanket was 26°C, which is the highest among all the options. This indicates that the Silverline pool blanket was able to trap more heat within the pool and prevent rapid cooling overnight compared to the other blankets.Rate this question:
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- 8.
Various scales are used to measure temperature. The Kelvin is the standard SI unit for temperature. Absolute temperature in Kelvin = temperature in degrees Celsius + 273. This unit has NO degrees symbol. Convert 35°C into Kelvin.
- A.
238 K
- B.
308 K
- C.
238˚ K
- D.
308˚ K
Correct Answer
B. 308 KExplanation
The correct answer is 308 K. The Kelvin is the standard SI unit for temperature and is used to measure absolute temperature. To convert degrees Celsius to Kelvin, you simply add 273 to the temperature in degrees Celsius. Therefore, to convert 35°C to Kelvin, you would add 273 to 35, resulting in 308 K.Rate this question:
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- 9.
This table shows the approximate speed of sound in various materials and at different temperatures. Material Speed of sound (m/s) Air (at 0°C) 331 Air (at 18°C) 342 Water 1440 Wood 4500 Steel 5100 Glass 5200 By looking at this data you could conclude that:
- A.
Sound travels at the same speed through all materials
- B.
Sound travels faster at cooler temperatures
- C.
Sound cannot pass through glass
- D.
Sound travels faster through substances that are more dense
Correct Answer
D. Sound travels faster through substances that are more denseExplanation
The given data shows that the speed of sound increases as the density of the material increases. This can be observed by comparing the speeds of sound in air, water, wood, steel, and glass. Air has the lowest density and the lowest speed of sound, while glass has the highest density and the highest speed of sound. Therefore, it can be concluded that sound travels faster through substances that are more dense.Rate this question:
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- 10.
Watch the video above and then TICK ALL THE CORRECT boxes below...
- A.
Sounds are collected by the outer ear.
- B.
The ear drum vibrates when sound waves strike it.
- C.
The inner ear contains the hammer, anvil and stirrup.
- D.
The middle ear contains the hammer, anvil and stirrup.
- E.
The cochlear is empty.
- F.
The cochlear is filled with fluid.
- G.
The tiny hairs in the cochlear transform vibrations into electrical signals that go to the brain.
Correct Answer(s)
A. Sounds are collected by the outer ear.
B. The ear drum vibrates when sound waves strike it.
D. The middle ear contains the hammer, anvil and stirrup.
F. The cochlear is filled with fluid.
G. The tiny hairs in the cochlear transform vibrations into electrical signals that go to the brain.Explanation
The video explains the process of hearing. It states that sounds are collected by the outer ear and the ear drum vibrates when sound waves strike it. It also mentions that the middle ear contains the hammer, anvil, and stirrup. Additionally, it states that the cochlear is filled with fluid and the tiny hairs in the cochlear transform vibrations into electrical signals that go to the brain.Rate this question:
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- 11.
Watch the video above and then TICK ALL THE CORRECT boxes below...
- A.
The sun transfers its heat energy through radiation.
- B.
Conduction is when heat energy is transferred by vibrating particles.
- C.
Conduction is when heat energy diffuses through a liquid or a gas.
- D.
Convection is when heat energy is transferred by vibrating particles.
- E.
Convection is when heat energy diffuses through a liquid or a gas.
Correct Answer(s)
A. The sun transfers its heat energy through radiation.
B. Conduction is when heat energy is transferred by vibrating particles.
E. Convection is when heat energy diffuses through a liquid or a gas.Explanation
The correct answer is that the sun transfers its heat energy through radiation, conduction is when heat energy is transferred by vibrating particles, and convection is when heat energy diffuses through a liquid or a gas. This explanation accurately summarizes the main points mentioned in the video.Rate this question:
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- 12.
Watch the video above and then TICK ALL THE CORRECT boxes below...
- A.
Sound is produced when something vibrates.
- B.
Frequency refers to how loud the sound is.
- C.
Frequency refers to the number of waves passing a point each second.
- D.
The higher the frequency the higher the pitch or tone of the sound.
- E.
Amplitude refers to how loud the sound is.
- F.
Amplitude refers to the number of waves passing a point each second.
Correct Answer(s)
A. Sound is produced when something vibrates.
C. Frequency refers to the number of waves passing a point each second.
D. The higher the frequency the higher the pitch or tone of the sound.
E. Amplitude refers to how loud the sound is.Explanation
The video explains that sound is produced when something vibrates. Frequency refers to the number of waves passing a point each second, and the higher the frequency, the higher the pitch or tone of the sound. Amplitude, on the other hand, refers to how loud the sound is.Rate this question:
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- 13.
True or false? Sound waves are longitudinal waves.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sound waves are longitudinal waves because they propagate by compressing and expanding the medium through which they travel. In other words, the particles of the medium vibrate parallel to the direction of the wave propagation. This is in contrast to transverse waves, where the particles move perpendicular to the direction of the wave.Rate this question:
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- 14.
True or false? The cochlear implant converts sounds into electrical impulses that are sent to the brain.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A cochlear implant is a medical device that is surgically implanted in the ear to help individuals with severe hearing loss or deafness. It works by converting sounds into electrical impulses that can be interpreted by the brain. These electrical impulses are sent directly to the auditory nerve, bypassing the damaged parts of the ear. Therefore, the statement "The cochlear implant converts sounds into electrical impulses that are sent to the brain" is true.Rate this question:
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- 15.
True or false? Sound is produced by vibrations.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sound is produced by vibrations. When an object vibrates, it creates sound waves that travel through the air or other mediums. These sound waves then reach our ears, which interpret them as sound. Therefore, the statement "Sound is produced by vibrations" is true.Rate this question:
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- 16.
True or false? Sound waves can travel in a vacuum.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Sound waves cannot travel in a vacuum because they require a medium, such as air, water, or solids, to propagate. In a vacuum, there are no particles or molecules to transmit the sound waves, resulting in the absence of sound.Rate this question:
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- 17.
True or false? Sound waves are longitudinal waves.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sound waves are longitudinal waves because they propagate by compressing and rarefying the medium through which they travel. In other words, the particles of the medium vibrate parallel to the direction of the wave propagation. This is in contrast to transverse waves, where the particles oscillate perpendicular to the direction of wave propagation.Rate this question:
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- 18.
Which of the two sounds below have the same amplitude (loudness)? CHECK TWO BOXES A B C
- A.
A
- B.
B
- C.
C
Correct Answer(s)
A. A
C. CExplanation
The question asks for two sounds that have the same amplitude or loudness. Looking at the options, sound A and sound C are the two sounds that have the same amplitude.Rate this question:
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- 19.
Which of the three sounds below has the highest frequency? A B C
- A.
A
- B.
B
- C.
C
Correct Answer
C. CExplanation
The sound with the highest frequency has the shortest wavelength. In this case, sound C has the highest frequency because it is represented by the shortest wavelength.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Apr 02, 2013Quiz Created by
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