Stanford Achievement Test Stanford Achievement Science Concepts 5 — Questions and Answers
Question 1: What is the name of the process by which liquid water changes into water vapor?
- Condensation
- Precipitation
- Evaporation (Correct answer)
- Freezing
Correct answer: Evaporation
Evaporation occurs when liquid water absorbs heat energy and transforms into water vapor, rising into the atmosphere.
Question 2: Which layer of Earth is the thinnest?
- Mantle
- Outer core
- Inner core
- Crust (Correct answer)
Correct answer: Crust
Earth's crust is the outermost and thinnest layer, ranging from about 5 km under the oceans to 70 km under continents.
Question 3: What do we call the transfer of heat through direct contact between objects?
- Convection
- Radiation
- Conduction (Correct answer)
- Reflection
Correct answer: Conduction
Conduction is heat transfer through direct contact, such as a metal spoon becoming hot when placed in a warm soup.
Question 4: Which of the following is NOT a characteristic of living things?
- Growth
- Reproduction
- Response to stimuli
- Made of metal (Correct answer)
Correct answer: Made of metal
Living things are composed of organic matter and cells, not metal; being made of metal is not a characteristic of life.
Question 5: In which phase of the moon does a full solar eclipse occur?
- Full moon
- New moon (Correct answer)
- Quarter moon
- Gibbous moon
Correct answer: New moon
A solar eclipse happens during a new moon when the Moon passes directly between the Earth and Sun, blocking sunlight.
Question 6: What is the role of chlorophyll in a plant?
- It transports water from roots to leaves
- It absorbs sunlight for photosynthesis (Correct answer)
- It stores sugar produced by the plant
- It protects leaves from insects
Correct answer: It absorbs sunlight for photosynthesis
Chlorophyll is the green pigment in plant cells that captures light energy and uses it to drive the photosynthesis process.
Question 7: What happens to the frequency of a sound wave when its pitch increases?
- Frequency decreases
- Frequency stays the same
- Frequency increases (Correct answer)
- Amplitude decreases
Correct answer: Frequency increases
Higher-pitched sounds have higher frequencies because the sound waves vibrate more times per second.
Stanford Achievement Test Stanford Achievement Science Concepts 5
What is the name of the process by which liquid water changes into water vapor?