MCAT Physics Practice Questions with Answers

Mastering MCAT Physics practice questions with answers is a critical step for premed students aiming to excel in the Chemical and Physical Foundations of Biological Systems section. This section of the MCAT evaluates your ability to apply basic physical principles to biological scenarios, ranging from fluid dynamics in the circulatory system to the optics of the human eye. By focusing on high-yield concepts like kinematics, electromagnetism, and thermodynamics, you can build the quantitative skills necessary to tackle even the most complex passage-based problems on test day.

Concept Explanation

MCAT Physics is the study of the fundamental laws of nature and how they apply to biological and chemical systems within the context of the medical entrance exam. Unlike undergraduate physics courses that often focus on abstract proofs, the MCAT emphasizes the application of concepts such as work, energy, fluids, and light to physiological processes. For instance, understanding Poiseuille's Law is essential for predicting how changes in blood vessel radius affect blood flow resistance. Success requires a firm grasp of units, vector addition, and the ability to perform mental math quickly. While you won't have a calculator, you are expected to manipulate scientific notation and logarithmic scales, particularly when dealing with sound intensity (decibels) or pH levels. If you are also reviewing chemistry, you might find our Medium MCAT General Chemistry Practice Questions helpful for integrating these physical sciences.

Solved Examples

Review these worked examples to understand the logic required for common MCAT-style physics problems.

1. Example: Kinematics
   A ball is thrown vertically upward with an initial velocity of $20 \text{ m/s}$. Neglecting air resistance and using $g = 10 \text{ m/s}^2$, how long does it take to reach its maximum height?
   
   1. Identify the knowns: $v_i = 20 \text{ m/s}$, $v_f = 0 \text{ m/s}$ (at peak), $a = -10 \text{ m/s}^2$.
   2. Use the kinematic equation: $v_f = v_i + at$.
   3. Substitute values: $0 = 20 + (-10)t$.
   4. Solve for $t$: $10t = 20$, so $t = 2 \text{ seconds}$.
2. Example: Work and Energy
   A 5 kg block is pushed 10 meters across a horizontal floor by a constant force of 50 N. If the force is applied at an angle of $60^\circ$ to the horizontal, how much work is done on the block?
   
   1. Recall the formula for work: $W = Fd \cos( heta)$.
   2. Identify values: $F = 50 \text{ N}$, $d = 10 \text{ m}$, $heta = 60^\circ$.
   3. Note that $\cos(60^\circ) = 0.5$.
   4. Calculate: $W = 50 \times 10 \times 0.5 = 250 \text{ Joules}$.
3. Example: Optics
   An object is placed 15 cm in front of a converging lens with a focal length of 10 cm. What is the image distance?
   
   1. Use the thin lens equation: $$\frac{1}{f} = \frac{1}{o} + \frac{1}{i}$$
   2. Substitute values: $f = 10$, $o = 15$.
   3. Rearrange for $\frac{1}{i}$: $$\frac{1}{i} = \frac{1}{10} - \frac{1}{15}$$
   4. Find a common denominator: $$\frac{1}{i} = \frac{3}{30} - \frac{2}{30} = \frac{1}{30}$$
   5. Solve: $i = 30 \text{ cm}$.

Practice Questions

Test your knowledge with these MCAT Physics practice questions. Ensure you are comfortable with both the conceptual and mathematical aspects of each topic.

1. A hydraulic lift has two pistons with areas $A_1 = 0.01 \text{ m}^2$ and $A_2 = 0.1 \text{ m}^2$. If a force of 50 N is applied to the smaller piston, what is the upward force exerted by the larger piston?

2. A sound wave traveling through air enters a pool of water. Which of the following properties of the wave remains constant during the transition from air to water?

3. A circuit contains a 12V battery and three resistors in series with resistances of $2\Omega$, $4\Omega$, and $6\Omega$. What is the total current flowing through the circuit?

4. An electron is moving at a constant velocity of $2 \times 10^6 \text{ m/s}$ through a uniform magnetic field of 0.5 T. If the velocity is perpendicular to the magnetic field, what is the magnitude of the magnetic force on the electron? (Charge of an electron $\approx 1.6 \times 10^{-19} \text{ C}$)

5. A 2.0 kg object is dropped from a height of 20 meters. Neglecting air resistance, what is its kinetic energy just before it hits the ground? (Use $g = 10 \text{ m/s}^2$)

6. According to the Bernoulli Principle, if the velocity of an incompressible fluid increases as it flows through a horizontal pipe, what happens to the static pressure of the fluid?

7. A radioactive isotope has a half-life of 4 days. If a sample initially contains 80 grams of the isotope, how much remains after 12 days?

8. A ray of light passes from air ($n \approx 1.0$) into a glass block ($n = 1.5$). If the angle of incidence is $30^\circ$, what is the sine of the angle of refraction?

Answers & Explanations

1. Answer: 500 N. According to Pascal's Principle, the pressure applied to an enclosed fluid is transmitted undiminished. Since $P_1 = P_2$, then $\frac{F_1}{A_1} = \frac{F_2}{A_2}$. Substituting the values: $\frac{50}{0.01} = \frac{F_2}{0.1}$. Solving for $F_2$ gives $5000 \times 0.1 = 500 \text{ N}$.
2. Answer: Frequency. When a wave moves from one medium to another, its speed and wavelength change, but its frequency is determined by the source and remains constant.
3. Answer: 1.0 A. For resistors in series, the total resistance is the sum: $R_{total} = 2 + 4 + 6 = 12\Omega$. Using Ohm's Law ($V = IR$), we get $12 = I(12)$, so $I = 1.0 \text{ A}$. If you need more practice with electrical concepts, check out our Hard MCAT Electrochemistry Practice Questions.
4. Answer: $1.6 \times 10^{-13} \text{ N}$. The magnetic force is given by $F = qvB \sin( heta)$. Since the velocity is perpendicular, $\sin(90^\circ) = 1$. Calculation: $F = (1.6 \times 10^{-19})(2 \times 10^6)(0.5) = 1.6 \times 10^{-13} \text{ N}$.
5. Answer: 400 J. By the conservation of energy, the potential energy at the top equals the kinetic energy at the bottom. $PE = mgh = (2.0)(10)(20) = 400 \text{ J}$. Therefore, $KE = 400 \text{ J}$.
6. Answer: The pressure decreases. Bernoulli's equation states that for a horizontal flow, an increase in fluid velocity is accompanied by a decrease in pressure or a decrease in the fluid's potential energy.
7. Answer: 10 grams. 12 days represents three half-lives ($12 / 4 = 3$). After one half-life, 40g remains; after two, 20g; after three, 10g.
8. Answer: 1/3. Use Snell's Law: $n_1 \sin( heta_1) = n_2 \sin( heta_2)$. Here, $(1.0) \sin(30^\circ) = (1.5) \sin( heta_2)$. Since $\sin(30^\circ) = 0.5$, we have $0.5 = 1.5 \sin( heta_2)$. Thus, $\sin( heta_2) = \frac{0.5}{1.5} = \frac{1}{3}$.

1. Which of the following describes a material that allows charge to flow freely?

• AInsulator
• BConductor
• CDielectric
• DSemiconductor

Frequently Asked Questions

How much physics is on the MCAT?

Physics accounts for approximately 25% of the Chemical and Physical Foundations of Biological Systems section, which translates to roughly 15 out of 59 questions. While it is a smaller portion than biology or chemistry, performing well in physics is essential for a competitive overall score.

What are the most high-yield physics topics?

High-yield topics include fluid dynamics, kinematics, work and energy, optics, and electrostatics. The MCAT frequently tests these concepts through the lens of biological systems, such as the physics of hearing or blood flow. You can also review Easy MCAT Gas Laws Practice Questions for related content.

Do I need to memorize all physics formulas for the MCAT?

You should memorize fundamental equations like Newton's Second Law, Ohm's Law, and the thin lens equation. However, the MCAT often provides specific constants or complex formulas within the passage text, so focus on understanding the relationships between variables rather than rote memorization.

Is a calculator allowed on the MCAT?

No, calculators are not permitted during any section of the MCAT. You must be able to perform scientific notation, basic trigonometry, and logarithmic estimations manually or mentally.

How can I improve my timing on physics questions?

Improve your speed by practicing mental math and learning to round numbers to make calculations simpler. Often, MCAT answer choices are far enough apart that approximate calculations will lead you to the correct option without needing exact decimals.