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Twelfth Grade (Grade 12) Science Questions

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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
In which medium does sound travel the fastest?
  1. Air
  2. Water
  3. Steel
  4. Vacuum
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
Grade 12 Physics
Why do sound waves diffract more easily around obstacles than light waves?
  1. Sound waves have longer wavelengths than light waves
  2. Sound waves are more energetic than light waves
  3. Sound waves are mechanical, and light waves are not
  4. Light waves cannot pass through obstacles
Grade 12 DNA, RNA, and Genetics
To make restriction fragments, a DNA sample is treated with                    .
  1. restriction enzymes
  2. gel electrophoresis
  3. DNA polymerase
  4. DNA ligase
  5. PCR
Grade 12 Physics
What type of boundary causes a wave to reflect back with its phase inverted?
  1. Free boundary
  2. Fixed boundary
  3. Open boundary
  4. No boundary
Grade 12 Physics
What happens to a wave’s speed as it enters shallow water and interacts with the seabed?
  1. The wave’s speed increases.
  2. The wave’s speed decreases.
  3. The wave’s speed remains constant.
  4. The wave changes direction.
Grade 12 Macromolecules
All are properties of water EXCEPT
  1. adhesion.
  2. cohesion.
  3. heat capacity.
  4. speeding up reactions.
Grade 12 Cell Structure and Function
What organelle has ribosomes attached to protein synthesis?
  1. Endoplasmic Reticulum
  2. Rough Endoplasmic Reticulum
  3. Smooth Endoplasmic Reticulum
  4. None of the above
Grade 12 Organic Chemistry
What is the IUPAC name of CH3-CH2-CH3?
  1. Propane
  2. Ethane
  3. Methane
  4. Butane
Grade 12 DNA, RNA, and Genetics
Which enzyme could be used to join two DNA fragments?
  1. DNA ligase
  2. DNA polymerase
  3. DNA recombinase
  4. DNA endonuclease
Grade 12 Protists and Fungi
What is the primary component of a fungal cell wall?
  1. cellulose
  2. chitin
  3. glycogen
  4. lipids
Grade 12 Atmosphere
The Coriolis effect is mainly a result of Earth’s                .
  1. rotation
  2. temperature
  3. curvature
  4. gravitation
  5. tilt
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