Daily Practice Questions

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

📝 Questions

💻 AP Computer Science A Hard
Consider the following method removeAll that creates and returns a string that has stripped its input phrase of all occurrences of its single-character String parameter ch .
  1. A. Change Line 10 to
  2. B. Change Line 12 to ✓
  3. C. Change Line 13 to
  4. D. Change Line 14 to
  5. E. Change Line 16 to
Explanation: The algorithm iterates through the input string, building a result by appending characters that do not match the target. The bug lies in the loop condition on Line 12. If the condition uses `i < s.length() - 1`, the loop terminates prematurely, excluding the final character from the check and potentially leaving it in the output or causing an index error depending on implementation. Changing Line 12 to `i < s.length()` ensures every character, including the last one at index $s.length() - 1$, is evaluated. This guarantees all occurrences of `ch` are removed. A common mistake is modifying the append logic, but the core issue is the incomplete traversal of the string indices.
✍️ AP English Language Easy
The writer wants to add a phrase at the start of sentence 11 (reproduced below), adjusting the capitalization as needed, to set up a comparison with the idea discussed in sentence 10.
  1. A. even so,
  2. B. when all is said and done, however,
  3. C. by the same token,
  4. D. conversely,
  5. E. on the other hand, ✓
Explanation: 41. (E) Using (E) as a transition, the writer contrasts the experiences of those who did and those who didn’t spend a certain period of time out-of-doors.
🧬 AP Biology Hard
Which species represents the outgroup in the cladogram?
  1. A. M
  2. B. N ✓
  3. C. O
  4. D. P
Explanation: Species N is the outgroup because it has the least in common with the other species, sharing only trait 2. Choices (A), (C), and (D) are incorrect because every other species shares two or more traits with the others in the cladogram.
🧪 AP Chemistry Medium
A certain reaction follows the rate law Rate = k [Br ^{-} ][BrO ^{-} ][H ^{+} ] ^{2} . What are the units of the rate constant, k ?
  1. A. s ^{-1} M ^{-3} ✓
  2. B. M s ^{-1}
  3. C. M ^{3} s
  4. D. M s
Explanation: A —The units on each side must match. The rate has the units of M /s (or M s ^{-1} or mol L ^{-1} s ^{-1} ). Substituting units for symbols changes the rate law from Rate = k [Br ^{-} ] [BrO ^{-} ] [H ^{+} ] ^{2} to M /s = k [ M ] [ M ] [ M ^{2} ] or M /s = k [ M ^{4} ]. From this, k must have the units 1/(s M ^{3} ) or s ^{-1} M ^{-3} .
⚛️ AP Physics C Medium
If the capacitor described in question 5 were disconnected from the battery before the plates were separated, the relationship between the initial and final electric fields would be
  1. A. E _{F} = E _{0} /4
  2. B. E _{F} = E _{0} /2
  3. C. E _{F} = E _{0} ✓
  4. D. E _{F} = 2 E _{0}
  5. E. E _{F} = 4 E _{0}
Explanation: Recall that the electric field due to an infinite sheet of charge does not depend on how close you are to the infinite sheet of charge. Because the capacitor is isolated, the charge has nowhere to go, so the charge density on the plates remains unchanged. Since the plates act approximately like infinite sheets of charge, the field between them does not depend on the distance between the sheets, so it remains unchanged.
📊 SAT Math Medium
Which choice completes the text so that it conforms to the conventions of Standard English? Melodies are so loved that people will hum them even when they are trying to concentrate on other things. Beats are so universally loved that babies will dance to them, and hard-of-hearing people will seek out their vibrations. _____________ in music. Humans, since the very beginning of our species, have used them to express joy, sadness, heartache, love, and pain.
  1. A. Art historians trace the resurgence and change; in Native American art to a movement that started with Cannon.
  2. B. Art historians trace the resurgence, and change in Native American art to a movement that started with Cannon.
  3. C. Art historians trace the resurgence and change in Native American art to a movement that started with Cannon. ✓
  4. D. Art historians trace the resurgence and change in Native American art—to a movement—that started with Cannon.
Explanation: No punctuation is needed to break up this sentence. Choice (A) is incorrect since there is not a complete sentence after the semicolon. Choice (B) incorrectly breaks up a two-part list with a comma. Choice (D) incorrectly inserts a parenthetical phrase.

💡 Study Tips

📖 Mix up your practice problems

Interleaving different problem types in a single study session (instead of doing all of one type first) builds your ability to identify which strategy to apply — a critical skill on test day.

💚 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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