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Twelfth Grade (Grade 12) Physics Questions

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Grade 12 Physics
In a chemical reaction, what remains constant according to the law of conservation of mass?
  1. The total number of atoms of each type.
  2. The physical state of the reactants.
  3. The color of the reactants and products.
  4. The temperature of the reaction.
Grade 12 Physics
Grade 12 Physics
Grade 12 Physics
What are valence electrons?
  1. Electrons in the innermost shell
  2. Electrons found in the nucleus
  3. Electrons located in the outermost energy level
  4. Electrons with opposite charge to protons
Grade 12 Physics
Grade 12 Physics
Why is nuclear energy considered a low-carbon energy source?
  1. It emits low amounts of methane during extraction.
  2. It only releases carbon dioxide during accidents.
  3. It does not produce greenhouse gases during electricity generation.
  4. It uses less fuel than fossil fuels.
Grade 12 Physics
What is the term for uncharged atoms with an equal number of protons and electrons?
  1. Ionic atoms
  2. Neutral atoms
  3. Isotopic atoms
  4. Charged atoms
Grade 12 Physics
Grade 12 Physics
What is the beat frequency equal to?
  1. The sum of the frequencies of the two waves
  2. The product of the frequencies of the two waves
  3. The average of the frequencies of the two waves
  4. The difference between the frequencies of the two waves
Grade 12 Physics
Which factor does not affect the magnitude of the Doppler shift for sound waves?
  1. The speed of sound in the medium
  2. The relative motion between the source and the observer
  3. The frequency of the source
  4. The observer's hearing ability
Grade 12 Physics
How does the speed of sound in air change with increasing temperature?
  1. Decreases
  2. Increases
  3. Remains constant
  4. May increase or decrease depending on other factors
Grade 12 Physics
What are regions of higher air pressure in a sound wave called?
  1. Rarefactions
  2. Compressions
  3. Nodes
  4. Antinodes
Grade 12 Physics
Grade 12 Physics
What type of motion do S-waves exhibit?
  1. Compression and rarefaction
  2. Rolling elliptical motion
  3. Horizontal side-to-side motion
  4. Shear movement perpendicular to wave propagation
Grade 12 Physics
What happens to the size of circular orbits as you move deeper into the water?
  1. They become larger
  2. They remain the same
  3. They become smaller
  4. They become unpredictable
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