Science — Anatomy
Which chamber of the heart pumps oxygenated blood into systemic circulation?
- A. Right atrium
- B. Right ventricle
- C. Left atrium
- D. Left ventricle
Correct answer: D. Left ventricle
Why: The left ventricle receives oxygenated blood from the left atrium and pumps it through the aorta into systemic circulation. The right ventricle pumps deoxygenated blood to the lungs.
Math — Percentages
A nursing class has 25 students. 60% pass the first quiz. How many students passed?
Correct answer: C. 15
Why: 60% of 25 = 0.60 × 25 = 15. Convert the percent to a decimal, then multiply by the whole.
Reading — Main Idea
Which best describes the author's primary purpose in a passage explaining how vaccines work?
- A. To persuade readers to vaccinate
- B. To entertain with medical stories
- C. To inform readers about immune response
- D. To compare vaccine brands
Correct answer: C. To inform readers about immune response
Why: When the passage focuses on explaining a biological process without taking a stance, the purpose is informational. Persuasive passages contain opinion language and a clear call to action.
English — Subject-Verb Agreement
Which sentence is grammatically correct?
- A. The team of nurses are exhausted.
- B. The team of nurses is exhausted.
- C. The team of nurses were exhausted.
- D. The team of nurses be exhausted.
Correct answer: B. The team of nurses is exhausted.
Why: 'Team' is a collective singular noun, so the verb must be singular ('is'). The prepositional phrase 'of nurses' does not change the subject.