Daily Practice Questions

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

📝 Questions

🧬 AP Biology Medium
In hot weather, humans can cool their body temperature by sweating. Which of the following properties of water makes this possible?
  1. A. high surface tension
  2. B. high specific heat ✓
  3. C. capillary action
  4. D. density of ice
Explanation: This question actually contains a factual error in the provided answer key; sweating relies on water's **high heat of vaporization**, not its specific heat, to remove body heat when it evaporates from the skin. High specific heat refers to water's ability to absorb large amounts of heat with only a small rise in temperature, which helps regulate global climate and stabilizes internal temperatures but does not directly explain the cooling mechanism of evaporation. The correct biological principle here is that water requires significant energy to change from liquid to gas, allowing sweat to draw substantial thermal energy away from the body during evaporation.
🧪 AP Chemistry Hard
The photoelectron spectrum of carbon has three equally sized peaks. Which peak is at the lowest energy?
  1. A. The 1s peak has the lowest energy.
  2. B. The 2s peak has the lowest energy.
  3. C. The 2p peak has the lowest energy. ✓
  4. D. The 1p peak has the lowest energy.
Explanation: C —The electron configuration of carbon is 1s ^{2} 2s ^{2} 2p ^{2} . The removal of the last electron (2p) requires the least amount of energy. Note that answer D is impossible as there is no such thing as a 1p orbital.
📐 AP Calculus Hard
The curve x ^{3} + x tan y = 27 passes through (3,0). Use the tangent line there to estimate the value of y at x = 3.1. The value is
  1. A. –2.7
  2. B. –0.9 ✓
  3. C. 0
  4. D. 0.1
Explanation: By implicit differentiation, 3x^{2}+x\sec^{2}y\frac{dy}{dx}+\tan y=0 . At (3,0),\frac{dy}{dx}=-9 ; so an equation of the tangent line at (3,0) is y = –9( x – 3).
✍️ AP English Language Medium
In context, lines 4–10 (“I had by far . . . almost incredible”) could be used to support all of the following claims about the speaker’s tone EXCEPT
  1. A. He adopts a reverent tone when describing the nature of his own dreams.
  2. B. His tone is reproachful when describing others who like to talk about their dreams.
  3. C. When describing the qualities of his own dreams he uses a self-serving tone.
  4. D. When describing his own dreams, the speaker assesses them realistically. ✓
  5. E. His tone when describing the content of other people’s dreams is derisive.
Explanation: The speaker is egregiously hypocritical, or even delusional. That is, he has retreated into a world of unreality, allowing himself to think more highly of himself than is warranted.
📝 ACT Prep Medium
Which of the following sentences provides new, specific guidelines about the proper training of a dog?
  1. A. Behavior that was cute in a twenty-pound puppy is alarming in a one-hundred-pound adult dog.
  2. B. Would-be dog owners should consider their own lifestyles and the temperament of a specific breed before adopting the animal.
  3. C. Dogs should be walked at least three times a day and should never be given a treat without first obeying a command. ✓
  4. D. Small children should never be left unsupervised with a dog.
Explanation: Identify the purpose of the proposed text. According to the question, one of these choices provides new, specific guidelines about the proper training of a dog. We don't even need to go back into the passage: find an answer choice that fulfills the purpose. Choices (F), (G), and (J) all may be true, but they do not offer any specific information about training a dog. Only (H) does that, and it is the correct answer.
📖 SAT Reading & Writing Medium
Density equals mass divided by volume. If density is graphed as a line with mass corresponding to the y value and the volume corresponding to the x value, what aspect of the function corresponds to the density of the substance?
  1. A. slope ✓
  2. B. y -intercept
  3. C. x -intercept
  4. D. domain
Explanation: Density is defined as mass divided by volume, or $D = m/v$. When graphing mass ($y$) against volume ($x$), this relationship becomes $y = D \cdot x$. In the linear equation $y = mx + b$, the coefficient of $x$ represents the slope. Therefore, the density corresponds to the slope of the line. The $y$-intercept is incorrect because it implies a non-zero mass when volume is zero, which is physically impossible for a substance.

💡 Study Tips

🎯 Review your mistakes, not just your score

After a practice test, spend more time analyzing the questions you got wrong than celebrating the ones you got right. Understanding your error patterns reveals exactly what to study next.

💚 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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