Physics Quizzes

Class 9 Mathematics quizzes
2

Hello-everyone-lets-play-a-quiz-300x157 Physics Quizzes

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Category: Physics

"Ready, Set, Quiz: Embark on a Journey of Discovery!"

19

LIGHT Quiz 1

tail-spin Physics Quizzes

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1. Which color of light has the longest wavelength?

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2. What is the phenomenon where light bends as it passes through different substances?

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3. When light passes from air into water, what happens to its speed?

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4. When light travels through a prism and separates into colors, what is this process called?

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5. Which part of the electromagnetic spectrum has wavelengths longer than visible light?

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6. In which medium does light travel the slowest?

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7. What is the name for the bouncing back of light from a surface?

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8. What is the phenomenon of the change in the direction of light when it passes from one medium to another?

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9. In which medium does light travel the fastest?

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10. Which part of the eye is responsible for focusing light onto the retina?

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11. Which scientist is famous for his experiments with light, prisms, and color?

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12. What is the phenomenon where white light separates into its component colors when passing through a prism?

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13. What is the color seen when white light passes through a prism and bends the least?

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14. What is the term for the bending of light waves due to a change in speed as they pass from one medium to another?

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15. What type of reflection occurs when light reflects off a smooth surface at the same angle it strikes it?

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16. Which of the following travels faster than light?

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17. What does a prism do to white light?

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18. What is the speed of light in a vacuum?

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19. Which color is obtained by mixing blue and green light in the additive color model?

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20. Which color is produced by combining red and green light in the additive color model?

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21. What type of mirror always forms a virtual, upright, and diminished image?

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22. What is the unit of measurement for the speed of light?

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23. Which type of lens diverges light rays and always forms virtual images?

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24. Which celestial body emits its own light, making it visible in the night sky?

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25. What type of lens converges light rays and can form real or virtual images?

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26. What happens to the speed of light when it travels from a denser to a rarer medium?

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27. What is the primary colors of light in the RGB color model?

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28. Which phenomenon causes a pencil to appear bent when partially submerged in water?

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29. What happens to the wavelength of light when it travels from air into glass?

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30. What is the unit of measurement for the frequency of light waves?

Your score is

The average score is 31%

0%

/30
17

SOUND Quiz 1

tail-spin Physics Quizzes

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Category: SOUND

1. Speed of sound in air at room temperature?

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Category: SOUND

2. What is the term for the distance between one peak of a sound wave and the next?

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Category: SOUND

3. What is the term for the highest point of a sound wave?

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Category: SOUND

4. What is the purpose of the tiny hairs in the inner ear?

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Category: SOUND

5. Which of the following is an example of a percussion instrument?

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Category: SOUND

6. Which gas is commonly used to transmit sound in cartoons?

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Category: SOUND

7. What part of the ear collects sound waves?

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Category: SOUND

8. Bouncing back of sound waves?

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Category: SOUND

9. Which of the following animals does not use echolocation?

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Category: SOUND

10. In which medium does sound travel the fastest?

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Category: SOUND

11. What part of the ear translates sound vibrations into electrical signals for the brain?

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Category: SOUND

12. What causes the sensation of sound in the human ear?

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Category: SOUND

13. Which musical instrument is known for using air columns to produce sound?

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Category: SOUND

14. Instrument with vibrating reeds?

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Category: SOUND

15. Term for highness or lowness of a sound?

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Category: SOUND

16. What property of sound determines loudness?

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Category: SOUND

17. Unit of frequency for sound waves?

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Category: SOUND

18. How does sound travel through a vacuum?

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Category: SOUND

19. Unit of measurement for sound?

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Category: SOUND

20. Material for absorbing sound waves?

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Category: SOUND

21. Device to measure sound intensity?

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Category: SOUND

22. Outer ear's primary purpose?

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Category: SOUND

23. In which medium does sound travel the slowest?

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Category: SOUND

24. Which material is a good conductor of sound?

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Category: SOUND

25. What is the range of human hearing in Hertz?

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Category: SOUND

26. What is the term for a sound that is unpleasant to the ear?

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Category: SOUND

27. What is the unit of power for sound waves?

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Category: SOUND

28. Animal known for exceptional hearing?

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Category: SOUND

29. What is the source of sound in a guitar?

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Category: SOUND

30. What is the unit of measurement for the frequency of sound waves?

Your score is

The average score is 35%

0%

LIGHT Quiz 2

tail-spin Physics Quizzes

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1. Magenta, green and orange are the ______ pigment colors.

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2. ________ are thin in the middle and thick round the edge.

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3. _________ are non-luminous objects.

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4. __________ are thickest in the middle and thin round the edge.

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5. The ray of light entering the new material is called the ___________.

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6. Light rays can be represented on diagram by ___________.

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7. __________ objects give out their own light.

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8. A magenta surface absorbs __________ light and reflects red and blue light.

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9. _________ objects do not emit light.

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10. The angles are measured between the rays and a line drawn at 90o to the mirror called the __________.

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11. The bent ray of light is called the ______________.

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12. A red filter absorbs blue and green light and transmits _______ light.

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13. Light travels one _________ times faster than sound.

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14. Chemicals which produce colors are called ____________.

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15. Yellow pigment color mixed with red gives ________.

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16. On earth, the _____ is main source of light.

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17. _____ are luminous source.

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18. When rays of light strike a flat (or plane) surface like a mirror, they are reflected in the ________ direction.

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19. Blue pigment color mixed with yellow gives ________.

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20. A __________ lens can be used as magnifying glass.

Your score is

The average score is 59%

0%

LIGHT Quiz 3

tail-spin Physics Quizzes

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Category: LIGHT

1. __________ is translucent material.

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Category: LIGHT

2. Materials in which light can pass through are __________.

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Category: LIGHT

3. _________ is the term for the bending of light waves around the edges of an aperture or obstacle.

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Category: LIGHT

4. Light rays travel _______.

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Category: LIGHT

5. ______ is the part of the eye which controls the amount of light entering.

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Category: LIGHT

6. The bending of light as it passes around the edge of an obstacle is called ______.

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Category: LIGHT

7. _________  is the phenomenon when light bends around small particles, making the sky appear blue.

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Category: LIGHT

8. Rough surfaces reflect light _________.

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Category: LIGHT

9. __________ is the phenomenon when light rays spread out after passing through a narrow slit.

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Category: LIGHT

10. When light passes through a convex lens and forms a real image, the image is located at ________.

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Category: LIGHT

11. In the color spectrum, _____  color is on the opposite side of the wheel from orange.

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Category: LIGHT

12. _______ is the bending of light waves around obstacles and openings.

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Category: LIGHT

13. The angle of incidence at which light is completely reflected back is called ____________.

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Category: LIGHT

14. _______ is the process where light is absorbed by atoms and then re-emitted in different directions.

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Category: LIGHT

15. ___________  is the primary function of the retina in the human eye.

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Category: LIGHT

16. The term "bioluminescence" refer to in the context of light means ________.

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Category: LIGHT

17. When a rainbow is formed, ________  color is on the outer edge

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Category: LIGHT

18. _______ appears black because it absorbs all colors of light.

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Category: LIGHT

19. The scientific name for a flat mirror is _______.

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Category: LIGHT

20. ________ part of electromagnetic waves has the shortest wavelength.

Your score is

The average score is 55%

0%

1

SOUND QUIZ 2

tail-spin Physics Quizzes

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1. What part of the ear is responsible for detecting changes in head position?

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2. What is the medical term for the ringing sound in the ears?

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3. Which type of wave is a sound wave?

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4. What is the speed of sound in water?

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5. What is the unit of measurement for the loudness of sound?

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6. What is the primary function of the ear's hammer, anvil, and stirrup?

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7. Which is not a form of energy?

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8. What is the term for the persistence of sound after the source stops producing it?

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9. What is the term for the perceived highness or lowness of a sound?

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10. Which musical instrument produces sound by vibrating a column of air in a pipe?

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11. In which part of the ear are the semicircular canals located?

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12. Which of the following materials is a good insulator of sound?

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13. In which medium does sound travel at a constant speed regardless of frequency?

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14. Which type of waves are used in medical ultrasound imaging?

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15. What is the minimum number of compressions and rarefactions needed for one complete cycle of a sound wave?

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16. Which animal is known for producing infrasound for communication?

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17. What part of the ear is responsible for converting sound vibrations into nerve impulses?

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18. Which type of waves are used in sonar to detect underwater objects?

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19. What property of a sound wave is associated with its quality or color?

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20. Which animal is known for producing ultrasound for communication?

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21. What is the frequency range of ultrasonic waves?

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22. What is the primary function of the pinna (external ear)?

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23. Which property of a sound wave determines its pitch?

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24. What is the term for the interference of sound waves resulting in a louder sound?

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25. Which part of the ear helps in localizing the direction of a sound source?

Your score is

The average score is 40%

0%

1

SOUND QUIZ 3

tail-spin Physics Quizzes

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Category: SOUND

1. __________ can be detected by whales, elephants, and rhinoceroses.

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Category: SOUND

2. In a __________, it is a string which vibrates.

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Category: SOUND

3. Loudness of a sound can be measured in ___________.

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Category: SOUND

4. Sound below _____ are called infrasound.

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Category: SOUND

5. Sounds above 20.000Hz are called __________.

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Category: SOUND

6. Sound waves take about ___ seconds to travel one kilometer.

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Category: SOUND

7. The ___________ of a sound is the number of sound vibrations set up in 1 second.

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Category: SOUND

8. ___________ is used in Hospitals for breaking down kidney stones.

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Category: SOUND

9. __________ can only move when there is material to move through.

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Category: SOUND

10. Noise is measured in __________.

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Category: SOUND

11. A sound meter converts _________ energy into electrical energy.

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Category: SOUND

12. Noise levels can be measured with a ___________.

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Category: SOUND

13. Sound with a high frequency have a _______ pitch.

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Category: SOUND

14. The relationship between the speed, frequency, and wavelength of a sound can be shown by the equation:______.

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Category: SOUND

15. _____________ is used for monitoring earthquakes and studying rock information.

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Category: SOUND

16. Sound is made when something _______.

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Category: SOUND

17. The Human ear is able to detect sound in a range _________.

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Category: SOUND

18. Bats and dogs can detect _________.

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Category: SOUND

19. Too much noise causes _________ pollution.

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Category: SOUND

20. Sound cannot travel through a __________.

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Category: SOUND

21. Pitch of a sound is measured in ________.

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Category: SOUND

22. Sound waves are ___________ waves.

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Category: SOUND

23. The loudness of a sound depends on the height of the sound waves __________.

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Category: SOUND

24. A _________  is a regular backward and forward movement.

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Category: SOUND

25. ___________ is the distance between two compressions or rarefactions.

Your score is

The average score is 64%

0%

PRESSURE AND MOMENTS QUIZ 1

tail-spin Physics Quizzes

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Category: PRESSURE AND MOMENTS

1. Which of the following machines operates based on the principle of moments?

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Category: PRESSURE AND MOMENTS

2. What is the pressure exerted by a column of mercury that is 760 mm high?

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Category: PRESSURE AND MOMENTS

3. Which of the following would increase the moment of a force?

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Category: PRESSURE AND MOMENTS

4. What is the pressure exerted by a force of 200 N over an area of 5 m²?

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Category: PRESSURE AND MOMENTS

5. Which of the following is an example of fluid pressure?

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Category: PRESSURE AND MOMENTS

6. What is the moment of a force if a 50 N force is applied at a distance of 2 meters from the pivot?

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Category: PRESSURE AND MOMENTS

7. If the area over which a force is distributed decreases, what happens to pressure?

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Category: PRESSURE AND MOMENTS

8. What is the pressure at a depth of 10 meters in water? (Density of water = 1000 kg/m³)

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Category: PRESSURE AND MOMENTS

9. A door is easier to open when pushed at which point?

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Category: PRESSURE AND MOMENTS

10. What is the pressure at sea level?

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Category: PRESSURE AND MOMENTS

11. If the distance from the pivot point is doubled, what happens to the moment of a force?

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Category: PRESSURE AND MOMENTS

12. Which of the following is NOT a factor affecting the moment of a force?

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Category: PRESSURE AND MOMENTS

13. Which of the following is NOT a unit of pressure?

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Category: PRESSURE AND MOMENTS

14. Which of the following is NOT a factor affecting fluid pressure?

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Category: PRESSURE AND MOMENTS

15. What is the formula for calculating moment?

16 / 30

Category: PRESSURE AND MOMENTS

16. Which principle explains why a person submerged deeper in water experiences greater pressure?

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Category: PRESSURE AND MOMENTS

17. What is pressure?

18 / 30

Category: PRESSURE AND MOMENTS

18. A force of 50 N is applied to an area of 10 m². What is the pressure exerted?

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Category: PRESSURE AND MOMENTS

19. What is the formula for pressure?

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Category: PRESSURE AND MOMENTS

20. What is a moment in physics?

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Category: PRESSURE AND MOMENTS

21. What happens to pressure as depth increases in a fluid?

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Category: PRESSURE AND MOMENTS

22. Which device is used to measure atmospheric pressure?

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Category: PRESSURE AND MOMENTS

23. A lever is a simple machine that operates based on which principle?

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Category: PRESSURE AND MOMENTS

24. Which of the following statements is true regarding pressure in a fluid?

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Category: PRESSURE AND MOMENTS

25. What is the SI unit of pressure?

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Category: PRESSURE AND MOMENTS

26. What is the SI unit of moment?

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Category: PRESSURE AND MOMENTS

27. Which of the following units is used to measure pressure?

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Category: PRESSURE AND MOMENTS

28. Which of the following would result in an increase in pressure?

29 / 30

Category: PRESSURE AND MOMENTS

29. Which of the following is NOT a common unit of pressure?

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Category: PRESSURE AND MOMENTS

30. A hydraulic press operates based on which principle?

Your score is

The average score is 40%

0%

PRESSURE AND MOMENTS QUIZ 2

tail-spin Physics Quizzes

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Category: PRESSURE AND MOMENTS

1. In a hydraulic lift, pressure is transmitted through a liquid to lift heavy objects. This phenomenon is explained by:

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Category: PRESSURE AND MOMENTS

2. Which is a simple machine; it helps to make work easier?

3 / 30

Category: PRESSURE AND MOMENTS

3. Which of the following is an example of a first-class lever in the human body?

4 / 30

Category: PRESSURE AND MOMENTS

4. What is the unit of pressure commonly used to measure pressure in liquids?

5 / 30

Category: PRESSURE AND MOMENTS

5. The pressure exerted by a gas is due to:

6 / 30

Category: PRESSURE AND MOMENTS

6. Which of the following statements is true about a third-class lever?

7 / 30

Category: PRESSURE AND MOMENTS

7. Which of the following factors affects the mechanical advantage of a lever?

8 / 30

Category: PRESSURE AND MOMENTS

8. Which of the following is NOT a characteristic of moments?

9 / 30

Category: PRESSURE AND MOMENTS

9. Which type of lever is most commonly used in the human body?

10 / 30

Category: PRESSURE AND MOMENTS

10. In which type of lever, is the load between the effort and the pivot?

11 / 30

Category: PRESSURE AND MOMENTS

11. The place where two bones meet is called?

12 / 30

Category: PRESSURE AND MOMENTS

12. What happens to the pressure of a liquid if the area over which the force is distributed decreases?

13 / 30

Category: PRESSURE AND MOMENTS

13. Which of the following is a characteristic of a first-class lever?

14 / 30

Category: PRESSURE AND MOMENTS

14. Which of the following statements about moments is false?

15 / 30

Category: PRESSURE AND MOMENTS

15. How does the pressure at the bottom of a container filled with liquid compare to the pressure at the top?

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Category: PRESSURE AND MOMENTS

16. What is the advantage of using a lever?

17 / 30

Category: PRESSURE AND MOMENTS

17. Which of the following would decrease the moment of a force?

18 / 30

Category: PRESSURE AND MOMENTS

18. If two equal forces act in opposite directions, what is the resultant moment?

19 / 30

Category: PRESSURE AND MOMENTS

19. Which of the following is a type of lever where the load is between the effort and the pivot?

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Category: PRESSURE AND MOMENTS

20. What can be squashed easily because its molecules have lots of space between them?

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Category: PRESSURE AND MOMENTS

21. In which type of lever, is the effort between the load and the pivot?

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Category: PRESSURE AND MOMENTS

22. Which type of lever is a pair of scissors?

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Category: PRESSURE AND MOMENTS

23. Which of the following is NOT an example of a lever?

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Category: PRESSURE AND MOMENTS

24. When the muscles work against each other, they are called which pairs?

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Category: PRESSURE AND MOMENTS

25. Which of the following is an example of a second-class lever?

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Category: PRESSURE AND MOMENTS

26. A simple hydraulic jack is used to lift which loads?

27 / 30

Category: PRESSURE AND MOMENTS

27. Which law states that the pressure of a gas is inversely proportional to its volume when the temperature is held constant?

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Category: PRESSURE AND MOMENTS

28. Which type of lever is a wheelbarrow?

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Category: PRESSURE AND MOMENTS

29. What principle explains why pressure increases with depth in a liquid?

30 / 30

Category: PRESSURE AND MOMENTS

30. What happens to the pressure in a liquid if its density increases?

Your score is

The average score is 56%

0%

PRESSURE AND MOMENTS QUIZ 3

tail-spin Physics Quizzes

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Category: PRESSURE AND MOMENTS

1. Which of the following objects has its center of gravity closer to the ground?

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Category: PRESSURE AND MOMENTS

2. In which direction does an object tend to fall if its center of gravity is not supported?

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Category: PRESSURE AND MOMENTS

3. Which of the following factors affects the center of gravity of an object?

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Category: PRESSURE AND MOMENTS

4. How does increasing the base of support affect the stability of an object?

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Category: PRESSURE AND MOMENTS

5. What is equilibrium?

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Category: PRESSURE AND MOMENTS

6. What is the center of gravity of an object?

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Category: PRESSURE AND MOMENTS

7. Which of the following objects has greater stability?

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Category: PRESSURE AND MOMENTS

8. Which of the following scenarios describes an object in translational equilibrium?

9 / 25

Category: PRESSURE AND MOMENTS

9. What happens to the stability of an object if its center of gravity is lowered?

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Category: PRESSURE AND MOMENTS

10. How does the distribution of mass affect the stability of an object?

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Category: PRESSURE AND MOMENTS

11. Which type of base provides the greatest stability for an object?

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Category: PRESSURE AND MOMENTS

12. What is the point at which lever turns?

13 / 25

Category: PRESSURE AND MOMENTS

13. What is the condition for an object to be in neutral equilibrium?

14 / 25

Category: PRESSURE AND MOMENTS

14. What force acts on a book placed on a table?

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Category: PRESSURE AND MOMENTS

15. Which type of equilibrium is demonstrated when an object remains in its displaced position?

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Category: PRESSURE AND MOMENTS

16. What is stability?

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Category: PRESSURE AND MOMENTS

17. Which force acts to return an object to its original position after being displaced?

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Category: PRESSURE AND MOMENTS

18. Which of the following factors affects the stability of an object?

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Category: PRESSURE AND MOMENTS

19. What is the condition for an object to be in stable equilibrium?

20 / 25

Category: PRESSURE AND MOMENTS

20. How does the center of gravity of an irregularly shaped object compare to that of a regularly shaped object?

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Category: PRESSURE AND MOMENTS

21. How does the shape of an object affect its center of gravity?

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Category: PRESSURE AND MOMENTS

22. What is the center of gravity of a suspended object?

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Category: PRESSURE AND MOMENTS

23. What type of equilibrium exists when a system returns to its original state after being disturbed?

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Category: PRESSURE AND MOMENTS

24. In a uniform object of regular shape, where is the center of gravity located?

25 / 25

Category: PRESSURE AND MOMENTS

25. What type of equilibrium is exhibited by an object that returns to its original position after being slightly displaced?

Your score is

The average score is 64%

0%

3

Physics

HEATING-AND-COOLING-QUIZ-1-300x170 Physics Quizzes

HEATING AND COOLOING QUIZ 1

tail-spin Physics Quizzes

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Category: HEATING AND COOLING

1. What is the main method of heat transfer in fluids?

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Category: HEATING AND COOLING

2. What is radiation?

3 / 15

Category: HEATING AND COOLING

3. What is the main method of heat transfer in metals?

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Category: HEATING AND COOLING

4. What is the principle of mass conservation?

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Category: HEATING AND COOLING

5. Which of the following is a good conductor of heat?

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Category: HEATING AND COOLING

6. What is conduction?

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Category: HEATING AND COOLING

7. What happens to ice at 0°C?

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Category: HEATING AND COOLING

8. Which of the following is a good insulator?

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Category: HEATING AND COOLING

9. What happens to water at 100°C?

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Category: HEATING AND COOLING

10. What is convection?

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Category: HEATING AND COOLING

11. What state of matter has particles close together but can move past each other?

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Category: HEATING AND COOLING

12. What state of matter has particles closely packed with fixed positions?

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Category: HEATING AND COOLING

13. What state of matter has particles widely spaced and can move freely?

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Category: HEATING AND COOLING

14. What happens to particles in a liquid when it evaporates?

15 / 15

Category: HEATING AND COOLING

15. What is a convection current?

Your score is

The average score is 15%

0%

1

Physics

HEATING-AND-COOLING-QUIZ-2-300x170 Physics Quizzes

HEATING AND COOLING QUIZ 2

tail-spin Physics Quizzes

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Category: HEATING AND COOLING

1. Why can a vacuum flask keep drinks cold as well as hot?

2 / 15

Category: HEATING AND COOLING

2. Why does hot air rise?

3 / 15

Category: HEATING AND COOLING

3. What occurs to particles in a solid as it reaches its melting point?

4 / 15

Category: HEATING AND COOLING

4. Why can convection not happen in solids?

5 / 15

Category: HEATING AND COOLING

5. What is the purpose of the silver lining in a vacuum flask?

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Category: HEATING AND COOLING

6. What is the process called when a liquid turns into a gas at a temperature below its boiling point?

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Category: HEATING AND COOLING

7. How is heat transferred in a vacuum?

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Category: HEATING AND COOLING

8. Why are houses in hot countries often painted white?

9 / 15

Category: HEATING AND COOLING

9. On a hot summer's day, why is the inside of a white car cooler than the inside of a black car?

10 / 15

Category: HEATING AND COOLING

10. Why do central heating radiators work better if they are painted black?

11 / 15

Category: HEATING AND COOLING

11. Why do fire-fighters enter smoke-filled rooms by crawling on the floor?

12 / 15

Category: HEATING AND COOLING

12. What happens to particles in a solid when it melts?

13 / 15

Category: HEATING AND COOLING

13. Why is it recommended to crawl on the floor in a smoke-filled room?

14 / 15

Category: HEATING AND COOLING

14. How does a vacuum flask keep drinks hot or cold?

15 / 15

Category: HEATING AND COOLING

15. How does aluminum foil help keep food warm?

Your score is

The average score is 0%

0%

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Physics

HEATING-AND-COOLING-QUI-3-300x170 Physics Quizzes

HEATING AND COOLING QUIZ 3

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Category: HEATING AND COOLING

1. Which materials make the best conductors of heat?

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Category: HEATING AND COOLING

2. Where does the heat energy come from to melt an ice cube left on a kitchen work surface?

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Category: HEATING AND COOLING

3. What is the change of state from liquid to solid called?

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Category: HEATING AND COOLING

4. What is an insulator?

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Category: HEATING AND COOLING

5. Which of the following best describes absolute zero?

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Category: HEATING AND COOLING

6. Why is the base of a saucepan made of metal?

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Category: HEATING AND COOLING

7. How is heat conducted along a metal bar?

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Category: HEATING AND COOLING

8. How does a heater warm all the air in a room?

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Category: HEATING AND COOLING

9. Which of the following is an insulator?

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Category: HEATING AND COOLING

10. Why do polar bears have a thick coat of fur?

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Category: HEATING AND COOLING

11. Why do birds fluff out their feathers in winter?

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Category: HEATING AND COOLING

12. Why can liquids and gases carry heat?

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Category: HEATING AND COOLING

13. Why does it take a long time to heat a room with a high ceiling?

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Category: HEATING AND COOLING

14. Why is the handle of a saucepan made of plastic?

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Category: HEATING AND COOLING

15. What is the Kelvin scale primarily used for?

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Physics

HEATING-AND-COOLING-QUIZ-4-300x170 Physics Quizzes

HEATING AND COOLING QUIZ 4

tail-spin Physics Quizzes

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Category: HEATING AND COOLING

1. What is the change of state from solid to liquid called?

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Category: HEATING AND COOLING

2. What is the change of state from liquid to gas called?

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Category: HEATING AND COOLING

3. Why do central heating radiators work better if they are painted black?

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Category: HEATING AND COOLING

4. What is heat?

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Category: HEATING AND COOLING

5. What happens to the particles in a liquid when it is heated?

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Category: HEATING AND COOLING

6. How is temperature measured?

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Category: HEATING AND COOLING

7. How is heat transferred in a vacuum?

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Category: HEATING AND COOLING

8. What happens to particles in a substance as temperature increases?

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Category: HEATING AND COOLING

9. What is the main method of heat transfer in fluids?

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Category: HEATING AND COOLING

10. What is temperature?

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Category: HEATING AND COOLING

11. What are units of heat energy called?

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Category: HEATING AND COOLING

12. What temperature scale starts at absolute zero?

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Category: HEATING AND COOLING

13. What is the change of state from gas to liquid called?

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Category: HEATING AND COOLING

14. What is the main reason a spark from a firework won't hurt as much as a cup of hot tea?

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Category: HEATING AND COOLING

15. What is absolute zero?

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