OAA Science 5 — Questions and Answers
Question 1: During an experiment, a student measures a liquid's volume in a graduated cylinder and reads the bottom of the curved liquid surface. What is this curved surface called?
- Meniscus (Correct answer)
- Surface tension
- Viscosity
- Capillary
Correct answer: Meniscus
The meniscus is the curved surface of a liquid in a container; volume is read from the bottom of this curve for water.
Question 2: Which type of inheritance pattern is shown when a red flower and a white flower cross to produce all pink flowers?
- Dominant inheritance
- Recessive inheritance
- Incomplete dominance (Correct answer)
- Codominance
Correct answer: Incomplete dominance
Incomplete dominance produces a blended intermediate phenotype (pink) rather than one dominant trait.
Question 3: What causes the seasons on Earth?
- Earth's changing distance from the Sun
- The tilt of Earth's axis as it orbits the Sun (Correct answer)
- The rotation of Earth on its axis
- Sunspot activity
Correct answer: The tilt of Earth's axis as it orbits the Sun
Earth's 23.5° axial tilt means different hemispheres receive more direct sunlight at different times of year.
Question 4: A student mixes two clear liquids and the mixture turns cloudy and produces a gas. This is evidence of a:
- Physical change
- Phase change
- Chemical change (Correct answer)
- Mixture separation
Correct answer: Chemical change
The production of a gas and change in appearance indicate new substances formed, which is a chemical change.
Question 5: Which organ system is primarily responsible for transporting oxygen and nutrients throughout the body?
- Digestive system
- Respiratory system
- Circulatory system (Correct answer)
- Nervous system
Correct answer: Circulatory system
The circulatory system (heart, blood vessels, blood) transports oxygen and nutrients to cells and removes waste.
Question 6: A punnett square cross between two parents, each with one dominant (T) and one recessive (t) allele, gives what ratio of dominant to recessive phenotypes?
- 1:1
- 2:1
- 3:1 (Correct answer)
- 4:1
Correct answer: 3:1
A Tt × Tt cross produces TT, Tt, Tt, tt — three dominant phenotypes for every one recessive phenotype.
Question 7: Which best describes the difference between speed and velocity?
- Speed includes direction; velocity does not
- Velocity includes direction; speed does not (Correct answer)
- Speed and velocity are the same thing
- Velocity is always greater than speed
Correct answer: Velocity includes direction; speed does not
Velocity is a vector quantity that includes both magnitude (speed) and direction, while speed is a scalar.
OAA Science 5
During an experiment, a student measures a liquid's volume in a graduated cylinder and reads the bottom of the curved liquid surface.
What is this curved surface called?