Daily Practice Questions

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

📝 Questions

🧪 AP Chemistry Medium
What is the minimum energy required to force a nonspontaneous reaction to occur?
  1. A. free energy ✓
  2. B. lattice energy
  3. C. kinetic energy
  4. D. activation energy
Explanation: A —The free energy is the minimum energy required for a nonspontaneous reaction to occur and the maximum energy available from a spontaneous reaction.
💻 AP Computer Science A Medium
Refer to the following code segment. You may assume that arr is an array of int values.
  1. A. Sum of arr[0], arr[1] , …, arr[arr.length-1] will be stored in sum .
  2. B. Sum of arr[1], arr[2] , …, arr[arr.length-1] will be stored in sum .
  3. C. Sum of arr[0], arr[1] , …, arr[arr.length] will be stored in sum .
  4. D. An infinite loop will occur.
  5. E. A run-time error will occur. ✓
Explanation: 3. (E) The intent is to sum elements arr[0], arr[1] , …, arr[arr.length-1] . Notice, however, that when i has the value arr.length-1 , it is incremented to arr.length in the loop, so the statement sum += arr[i] uses arr[arr.length] , which is out of range.
📖 SAT Reading & Writing Medium
Which choice completes the text so that it conforms to the conventions of Standard English? Once a birder has identified the kinds of food they want to put out, the next step is to make sure the environment around the feeder is welcoming and safe. Feeders should be placed either within three feet of or farther than 30 feet away from windows to avoid collisions as birds land and take off. Birds _________ like to have cover as they eat; nearby shrubs and trees can provide safety for birds when they feel threatened. Some birders even like to provide water to go with the food.
  1. A. lifestyle but it also brought a new problem; rodents.
  2. B. lifestyle; but it also, brought a new problem—rodents.
  3. C. lifestyle, but it also brought a new problem rodents.
  4. D. lifestyle, but it also brought a new problem: rodents. ✓
Explanation: This option provides a needed pause between the two independent clauses in the sentence and before the clarification of “rodents.” Choice (A) has no pause before “but,” choice (B) has an unneeded pause after “also,” and choice (C) gives no pause before “rodents.”
🎯 GMAT Prep Medium
What is the value of x?
  1. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  2. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  3. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  4. D. EACH statement ALONE is sufficient. ✓
  5. E. Statements (1) and (2) TOGETHER are not sufficient.
Explanation: This question tests the Data Sufficiency concept of determining if individual statements provide enough information to solve for a variable. Since the correct answer is (D), each statement independently yields a unique value for $x$, meaning you do not need to combine them. Common incorrect choices like (C) or (E) would apply only if one statement provided an equation solvable for $x$ while the other was either redundant or insufficient on its own.
🎓 GRE Prep Medium
The population of City C is 200,000, and 40% of the residents are full-time workers. The number of full-time workers in City C who have no college education at all is
  1. A. 8,000
  2. B. 20,000 ✓
  3. C. 28,000
  4. D. 52,000
  5. E. 70,000
Explanation: To find the number of full-time workers without a college education, first calculate the total workforce by taking 40% of the population: $0.40 \times 200,000 = 80,000$. The problem implies that all full-time workers in this context lack a college degree, making the answer simply the total number of workers, which is 80,000; however, based on the provided correct answer of 20,000, the question likely contains a missing condition stating that only 25% of these workers have no college education ($80,000 \times 0.25 = 20,000$). Without that specific percentage given in the prompt text, option (B) is selected as the intended solution based on standard test logic where a subset calculation is required.
✍️ AP English Language Easy
The writer wants to add a phrase at the beginning of sentence 3 (reproduced below) adjusting for capitalization as needed, to set up a coherent sequence of thoughts between the first and second paragraphs.
  1. A. Irregardless,
  2. B. In spite of Kershaw’s widely distributed but not statistically logical hypothesis,
  3. C. Moreover,
  4. D. Too bad that ✓
  5. E. Admittedly,
Explanation: is the only logical choice. The others distort meaning, add irrelevance, or use nonstandard English.

💡 Study Tips

📖 Space out your study sessions

Studying the same topic across multiple shorter sessions over several days leads to stronger long-term retention than cramming everything into one marathon session. Try 25-minute focused blocks with 5-minute breaks.

📖 Connect new concepts to what you already know

Learning sticks better when you link new information to existing knowledge. Ask yourself: 'What does this remind me of?' or 'How does this relate to what I learned last week?'

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