Daily Practice Questions

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

📝 Questions

🧬 AP Biology Medium
In peas, round ( R ) peas are dominant and wrinkled ( r ) peas are recessive. A plant with an unknown genotype for this trait has round peas. Which of the following results of a test cross would support the hypothesis that the genotype of the plant with the round peas is heterozygous?
  1. A. 100% round offspring
  2. B. 75% round offspring and 25% wrinkled offspring
  3. C. 50% round offspring and 50% wrinkled offspring ✓
  4. D. 100% wrinkled offspring
Explanation: A test cross involves mating an individual with a dominant phenotype but unknown genotype to a homozygous recessive individual (rr). If the plant with round peas were homozygous dominant (RR), all offspring would be round; however, if it is heterozygous (Rr), it produces gametes with either the R or r allele in equal proportions. When crossed with an rr parent, this results in a 1:1 phenotypic ratio of 50% round and 50% wrinkled offspring, confirming the unknown plant's heterozygous status.
📊 SAT Math Hard
11. The results of a nationwide survey of veterinarians reported that 5 percent of dogs that they treated had behavioral problems. Which of the following best explains why the results of the study are unlikely to represent the percentage of all dogs in the nation that have behavioral problems?
  1. A. Dog owners’ descriptions of their pets’ behavior are not always accurate.
  2. B. The survey included only state-licensed veterinarians.
  3. C. Dogs with behavioral problems could also have physical illnesses.
  4. D. Veterinarians are more likely to see dogs that have behavioral problems than those that do not. ✓
Explanation: Getting to the Answer: Choice (D) points out that dogs treated by veterinarians are more likely to have behavioral problems than dogs in general and is the correct choice.
🧪 AP Chemistry Easy
Steel is an alloy of iron and carbon with 2.1% or less carbon by mass. Which of the following statements best explains how the addition of carbon affects the properties of steel? Questions 56 and 57 are based on the following diagram and electronegativity data.
  1. A. Carbon changes the physical properties of iron atoms.
  2. B. Carbon changes the chemical properties of iron atoms.
  3. C. Carbon changes the structural arrangement of iron atoms. ✓
  4. D. Carbon undergoes fusion with iron to form atoms of steel.
Explanation: Steel is aninterstitial alloy(as opposed to asubstitutional alloy; see figure below). Interstitial alloys combine elements of different radii. The atoms of larger radius (in this case, iron) are present in much greater quantities and form the “main” lattice structure, whereas the atoms of smaller radius fit in between them (hence the nameinterstitial). This changes the microscopic structure of the lattice and therefore the bulk (macroscopic) properties of the alloy.
✍️ AP English Language Medium
In the next-to-last paragraph of the passage (sentences 28–30), the writer wants to provide further evidence to support the claim, made in sentence 28, that nature prescriptions are becoming not only more common but even essential to a comprehensive health plan for an individual. Which of the following pieces of evidence would best achieve this purpose?
  1. A. An announcement by the AMA (American Medical Association) that doctors should routinely consider recommending outdoor experiences to their patients
  2. B. The publication of a best-selling book containing the accounts of two dozen gravely ill men and women whose health returned to normal after a prescribed regimen of outdoor activities
  3. C. A report on the effectiveness of the “healing forest” created for stressed-out citizens of South Korea
  4. D. A month-long public-service infomercial campaign broadcast on social media to highlight the health benefits of outdoor activity
  5. E. The development by the National Institutes of Health of age-appropriate guidelines—like those for weekly exercise—for experiences in natural settings ✓
Explanation: 45. (E) A set of guidelines developed by a world-class authority like the NIH is the most convincing evidence.
📝 ACT Prep Medium
Which of the following questions is NOT answered by information given in the passage?
  1. A. How many bee ranches might be successfully established in the Sierra Mountains?
  2. B. What types of flowers attract bees?
  3. C. Where did the honeybees in the Sierra Mountains come from?
  4. D. How much honey is produced by bee-trees in the Sierra Mountains? ✓
Explanation: The passage discusses the potential for establishing bee ranches and mentions that certain flowers attract bees, but it never provides specific data on honey production volumes from "bee-trees." Therefore, choice (J) asks about information that is not present in the text. In contrast, the passage likely offers general details or context regarding flower types and the origin of bees, making those questions answerable based on the provided material.
🎓 GRE Prep Medium
In a four-digit positive integer y, the thousands digit is 2.5 times the tens digit. The tens digits of y 4
  1. A. Quantity A is greater.
  2. B. Quantity B is greater. ✓
  3. C. The two quantities are equal.
  4. D. The relationship cannot be determined from the information given.
Explanation: Let the tens digit be t. Then thousands digit = 2.5t. Since digits are integers from 0–9, and thousands digit must be a non-zero integer (1–9), 2.5t must be an integer between 1 and 9. So t must be even: try t=0 → thousands digit = 0 (invalid, leading digit can't be 0). t=2 → 2.5×2 = 5 (valid, thousands digit = 5). t=4 → 2.5×4 = 10 (invalid, digit >9). t=1 → 2.5 (not integer). t=3 → 7.5 (not integer). So only possible tens digit is t=2, giving thousands digit = 5. Thus the tens digit must be exactly 2, which is less than Quantity B (4). So Quantity A = 2 < Quantity B = 4 ⇒ B is greater.

💡 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.

💚 Sleep is a study strategy

Your brain consolidates memories during sleep. Reviewing material before bed and getting a full night's rest is more effective than staying up late to study. Aim for 8-10 hours before exam day.

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