Daily Practice Questions

6 questions across multiple subjects, with detailed explanations and study tips.

📝 Questions

⚛️ AP Physics C Medium
A mass m is attached to a rod with uniform mass density at point C as shown. The rotational inertia of this system is greatest when it is rotated about an axis perpendicular to the rod that passes through
  1. A. point A
  2. B. point B ✓
  3. C. point C
  4. D. a point between points A and B
  5. E. a point between points B and C
Explanation: The rotational inertia ($I$) of a system increases as the axis of rotation moves further from the mass distribution, since $I = \sum mr^2$. In this setup, the rod has uniform density and an additional mass $m$ is attached at point C; therefore, the total mass is concentrated on the right side of the diagram. Rotating about point B places the axis furthest to the left of all the system's mass (the rod and the attached weight), maximizing the average distance ($r$) of the mass from the axis. Consequently, point B yields the greatest rotational inertia compared to points A, C, or any intermediate points where the axis is closer to the bulk of the mass.
💻 AP Computer Science A Medium
What value is stored in result if
  1. A. −5
  2. B. 0
  3. C. 13 ✓
  4. D. −1
  5. E. 12
Explanation: 5. (E) The operators *, / , and % have equal precedence, all higher than - , and must be performed first, from left to right.
📝 ACT Prep Easy
Passage III HUMANITIES: This passage is adapted from the article “The Sculpture Revolution” by Michael Michalski (©1998 Geer Publishing). The author expresses the idea that:
  1. A. modern sculpture is more important than classical art.
  2. B. Cézanne was more innovative than Rodin. ✓
  3. C. Rodin was more innovative than Cézanne.
  4. D. Cézanne tried to emulate impressionism.
Explanation: The passage discusses how Cézanne's innovations influenced modern art more broadly compared to Rodin, suggesting he had greater impact in terms of innovation. This makes option B the most accurate reflection of the author's perspective.
🧬 AP Biology Medium
Cyanide is a poison that blocks the movement of electrons down the electron transport chain. Which of the following would be the most immediate result of cyanide poisoning?
  1. A. No pyruvate would be produced.
  2. B. No NADH would form.
  3. C. No ATP would be produced.
  4. D. Chemiosmosis would not occur. ✓
Explanation: Cyanide blocks electron transport in the inner mitochondrial membrane, preventing protons from being pumped into the intermembrane space; without this proton gradient, chemiosmosis—the diffusion of protons back through ATP synthase to generate ATP—cannot occur. While cyanide poisoning ultimately stops ATP production (Choice C), the immediate mechanistic failure is the inability to establish the electrochemical gradient required for chemiosmosis. Choices A and B are incorrect because glycolysis continues anaerobically, still producing pyruvate and regenerating NADH even when oxidative phosphorylation is halted.
🎓 GRE Prep Easy
What is the value of x in the equation x^2 + 10x + 24 = 0?
  1. A. x = –4 or x = –6 ✓
  2. B. x = 4 or x = 6
  3. C. x = –2 or x = –12
  4. D. x = 2 or x = 12
Explanation: The quadratic equation x² + 10x + 24 = 0 factors as (x + 4)(x + 6) = 0, so the solutions are x = –4 or x = –6.
📐 AP Calculus Medium
An object moving along a line has velocity v ( t ) = t cos t – ln ( t + 2), where 0 ≤ t ≤ 10. The object achieves its maximum speed when t is approximately
  1. A. 5.107
  2. B. 6.419
  3. C. 7.550
  4. D. 9.538 ✓
Explanation: Use your calculator to graph velocity against time. Speed is the absolute value of velocity. The greatest deviation from v = 0 is at t = c . With a calculator, c = 9.538.

💡 Study Tips

📖 Explain it to someone else

If you can explain a concept in simple terms to a friend or family member, you truly understand it. If you stumble, that's exactly where you need to focus your review.

💚 Don't multitask while studying

Switching between studying and your phone, social media, or TV fragments your attention and dramatically reduces what you retain. Put your phone in another room during focused study blocks.

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