Science Reviewer for College Entrance Exams: Free Practice Questions

Mariano Luiz King

Free science reviewer for college entrance exams, with practice questions on physics, chemistry, biology, earth science, and astronomy. Pick an answer to see the explanation. No sign-up needed.

Free Science reviewer: mock questions

Questions from across the question types, picked from core topics. Pick an answer to see whether you got it right, along with the full explanation.

Question 1
Physics
A 4 kg object accelerates at 2 m/s². What is the net force on it?
Not quite. The answer is: 8 N
Topic: Newton's Second Law.
Formula: $F = ma$ .
Result: $4 \text{ kg} \times 2 \text{ m/s}^2 = 8 \text{ N}$ .
Question 2
Physics
What is the kinetic energy of a 3 kg object moving at 7 m/s?
Not quite. The answer is: 73.5 J
Topic: Energy (Kinetic).
Formula: $KE = \frac{1}{2}mv^2$ .
Result: $KE = 0.5 \times 3 \times 7^2 = 0.5 \times 3 \times 49 = 73.5 \text{ J}$ .
Question 3
Chemistry
An object has mass 322 g and volume 119 cm³. What is its density?
Not quite. The answer is: 2.71 g/cm³
Topic: Properties of Matter.
Formula: $\rho = \frac{m}{V}$ .
Result: $\rho = \frac{322\text{g}}{119\text{cm}^3} \approx 2.71 \text{ g/cm}^3$ .
Question 4
Biology
Which organelle is primarily responsible for producing ATP (energy) in eukaryotic cells?
Not quite. The answer is: Mitochondrion
Topic: Cell Biology.
Explanation: Known as the 'powerhouse of the cell,' mitochondria perform cellular respiration to produce ATP energy.
Question 5
Biology
A group of the same species living in the same area is called a:
Not quite. The answer is: Population
Topic: Ecology.
Explanation: A community involves multiple species; a population involves only one.
Question 6
Earth science
What is the innermost layer of the Earth called?
Not quite. The answer is: Inner core
Topic: Geology.
Explanation: The inner core is a solid ball of iron and nickel, kept solid by immense pressure despite extreme temperatures.
Question 7
Astronomy
A new moon occurs when the Moon is:
Not quite. The answer is: Between Earth and the Sun, with its dark side facing Earth
Topic: Earth-Moon System.
Explanation: At new moon the Moon lies between Earth and the Sun, so its unlit half faces us and it is invisible.

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Science reviewer FAQ

Is science in the ACET?

Past takers don’t list a separate science subtest for the ACET. It is reported on the UPCAT, DCAT, USTET, PLMAT, and PUPCET.

Which science subject should I review first?

Biology and physics usually have the most items. Start with the basics of each: cell parts, ecology terms, and the formulas F = ma, KE = ½mv², and Ohm’s law.

Are science questions computations or memorization?

Both. Physics and chemistry often ask you to plug numbers into a formula. Biology and earth science are mostly concepts and terms.

Can I practice science questions for free on prepPH?

Yes. The practice questions on this page are free to try without an account. prepPH also has a free plan, and a Premium plan that unlocks unlimited flashcards and weak-topic breakdowns.

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