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Twelfth Grade (Grade 12) Science Questions

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Grade 12 Skin, Skeleton, and Muscles
What connects muscle to bones?
  1. cartilage
  2. ligaments
  3. joints
  4. tendons
Grade 12 DNA, RNA, and Genetics
DNA ligase plays an essential role in biotechnology because it                                               .
  1. helps foreign DNA to integrate into native DNA
  2. clears off alien DNA to keep the sample pure
  3. prevents the DNA from being digested
  4. is extremely thermostable and effective
Grade 12 Respiration, Digestion, and Excretion
What does the respiratory system do?
  1. pumps blood throughout the body
  2. takes oxygen in and exchanges it for carbon dioxide
  3. gives the body nutrients
  4. makes babies
Grade 12 Organic Chemistry
A student named an alkane 2-ethylpropane. The correct IUPAC name of the alkane is
  1. 2-Methylbutane.
  2. 2,2-Dimethylbutane.
  3. 2,3-Dimethylbutane.
  4. 2,3-Dimethylpentane.
Grade 12 Macromolecules
Which organic molecule is represented by the structural formula below?
Structural Formula - Carbon Chain Glucose
  1. sucrose
  2. fatty acid
  3. glucose
  4. starch
Grade 12 Physics
How do musicians use beats to tune their instruments?
  1. By listening for the loudness of the combined sound
  2. By listening for the presence or absence of beats
  3. By measuring the wavelength of the sound waves
  4. By analyzing the harmonics of the sound
Grade 12 Physics
How does Newton's third law relate to the concept of momentum in a collision?
  1. Momentum remains constant during a collision.
  2. Momentum is not affected by external forces.
  3. Momentum changes only if the masses involved are equal.
  4. Momentum changes due to unbalanced forces.
Grade 12 Physics
What happens to the frequency of sound waves when the source moves toward the observer?
  1. frequency decreases
  2. frequency remains the same
  3. frequency increases
  4. The sound is absorbed by the medium
Grade 12 Physics
According to Newton's first law, what happens to an object at rest if no external force is applied?
  1. It accelerates
  2. It remains at rest
  3. It moves at a constant velocity
  4. It moves in a circular path
Grade 12 Physics
What type of motion do water particles exhibit in surface waves?
  1. Horizontal only
  2. Vertical only
  3. Elliptical or circular
  4. Linear motion
Grade 12 Physics
What is the primary form of energy at the initial point of a projectile’s motion when it is launched from the ground?
  1. Potential Energy
  2. Kinetic Energy
  3. Thermal Energy
  4. Electrical Energy
Grade 12 Physics
Which of the following is an example of an elastic collision?
  1. A car crash where both cars are deformed.
  2. Two rubber balls bouncing off each other.
  3. A meteor hitting the Earth's surface and forming a crater.
  4. A bullet embedding itself into a block of wood.
Grade 12 Biochemical Pathways
Photosynthesis occurs in the chloroplasts of                .
  1. ants
  2. plants
  3. grasshoppers
  4. chickens
Grade 12 DNA, RNA, and Genetics
The two identical halves of a chromosome after replication are
  1. kinetochores.
  2. spindle fibers.
  3. sister chromatids.
  4. centromeres.
Grade 12 Nervous and Endocrine Systems
The                 system is the most highly developed organ system in the human body.
  1. respiratory
  2. nervous
  3. muscular
  4. skeletal
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