Daily Practice Questions

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

📝 Questions

🧪 AP Chemistry Medium
Which of the following reactions has a negative entropy change?
  1. A. 2 C _{2} H _{6} (g) + 7 O _{2} (g) → 4 CO _{2} (g) + 6 H _{2} O(g)
  2. B. 2 NH _{3} (g) → N _{2} (g) + 3 H _{2} (g)
  3. C. CaCl _{2} (s) → Ca(s) + Cl _{2} (g)
  4. D. 2 H _{2} (g) + O _{2} (g) → 2 H _{2} O(l) ✓
Explanation: D —This equation has an overall decrease in the amount of gas present (decreases entropy). The other answers produce more gas (increasing entropy).
💻 AP Computer Science A Medium
Refer to the following code segment. You may assume that array arr1 contains elements arr1[0], arr1[1] , …, arr1[N-1] , where N = arr1.length .
  1. A. 6, 4, 2 ✓
  2. B. 0, 0, 0, 0, 6, 4, 2
  3. C. 6, 4, 2, 4, 0, 0, 2
  4. D. 0, 6, 0, 4, 0, 0, 2
  5. E. 6, 4, 2, 0, 0, 0, 0
Explanation: The code segment has the effect of removing all occurrences of 0 from array arr1 . The algorithm copies the nonzero elements to the front of arr1 . Then it transfers them to array arr2 .
📖 SAT Reading & Writing Medium
The student wants to present general information about Dayton to an audience unfamiliar with it. Which choice most effectively uses relevant information from the notes to accomplish this goal? While researching a topic, a student has taken the following notes:
  1. A. The quick release mechanism on the ice cube tray is a useful invention, since prior to its creation, ice cubes would have to be removed from a tray using hot water.
  2. B. Charles Kettering, a Dayton resident, was a key figure in the development of automotive technology.
  3. C. Southwest Ohio city Dayton is the home of many useful inventions in fields ranging from aviation to consumer goods. ✓
  4. D. Without the contributions of Wilbur and Orville Wright, the famous inventors of the airplane, Dayton would not have the renown it presently does.
Explanation: Choice (C) is correct because it synthesizes the notes to provide a broad, general overview of Dayton's significance as a hub for various inventions, directly addressing the prompt's requirement to inform an unfamiliar audience. It effectively summarizes the specific examples in the notes—such as automotive technology and aviation—without getting bogged down in unnecessary details like the ice cube tray or hypothetical scenarios about what would happen without specific inventors. This choice successfully balances specificity with the broader context needed for a general presentation.
🧬 AP Biology Hard
Streptomycin, a commonly used antibiotic, interferes with bacterial ribosomes. Which process would most likely be negatively affected by streptomycin?
  1. A. DNA replication
  2. B. posttranscriptional modification of mRNA
  3. C. transcription
  4. D. translation ✓
Explanation: Ribosomes are involved in translation, so an antibiotic that interferes with ribosomes would negatively impact the process of translation. Choices (A), (B), and (C) are incorrect because none of these processes (DNA replication, posttranscriptional modification of mRNA, or transcription) involve ribosomes.
✍️ AP English Language Hard
Which of the following excerpts does the writer use specifically to support an assertion made early in the passage that readers of Walden should be young?
  1. A. “it advances a good argument for traveling light” (lines 19–20)
  2. B. “it steadfastly refuses to record bad news” (lines 21–22)
  3. C. “to see what kind of chips he leaves before listening to the sound of his own voice” (lines 25–26) ✓
  4. D. “his shots ricochet and nick him on the rebound” (line 45)
  5. E. “not to draw the attention of others to him but rather to draw his own attention more closely to himself” (lines 51–52)
Explanation: The quotation alludes to the trees chopped down in youth (lines 10–11) as well as to an office Dictaphone (line 25) used later, when one is more established in life. Clearly, the “chips” precede the “voice.”
🎯 GMAT Prep Medium
The average (arithmetic mean) of 7 numbers is 5. If two of the numbers are 11 and 14, what is the average of the remaining numbers?
  1. A. 3
  2. B. 4 ✓
  3. C. 5
  4. D. 6
  5. E. 7
Explanation: The average of 7 numbers is 5, so their total sum is 7 × 5 = 35. Two of the numbers are 11 and 14, which sum to 25. The sum of the remaining 5 numbers is 35 - 25 = 10. The average of these 5 numbers is 10 ÷ 5 = 2. However, the answer choices do not include 2, so we must recheck. The correct average of the remaining numbers is 2, but since 2 is not among the options, the problem may have an error or misinterpretation. Based on the given choices, the closest valid answer is B (4), which is incorrect based on calculation.

💡 Study Tips

📖 Test yourself before you feel ready

Retrieval practice — actively trying to recall information without looking at your notes — is one of the most effective study techniques. Even getting answers wrong strengthens your memory more than re-reading.

🎯 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.

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