Free OAT Exam Questions That Helps Candidates Pass

Comprehensive and Detailed Explanation (150–250 words):

Mirror equation: 1/f=1/do+1/di1/f = 1/d_o + 1/d_i. Here, f=10f = 10 cm, do=15d_o = 15 cm. Solve: 1/di=1/10−1/15=(3−2)/30=1/301/d_i = 1/10 - 1/15 = (3-2)/30 = 1/30. Thus di=30d_i = 30 cm (positive means real image in front). Magnification = –di/do=−30/15=−2d_i/d_o = -30/15 = -2, so the image is inverted and twice as large. Correct: A.

Comprehensive and Detailed Explanation (150–250 words):

The passage lists quotas, MPAs, and sustainable practices. Aquaculture (fish farming) is not mentioned. Correct: C.

Comprehensive and Detailed Explanation (150–250 words):

Subtract 9: 2x=122x = 12. Divide by 2: x=6x = 6. Correct answer: C (6), not B. Common mistake is subtracting incorrectly.

Comprehensive and Detailed Explanation (150–250 words):

Frequency = 1 / Period = 1 / 0.50 = 2 Hz. Correct: B. This simple reciprocal relation often appears in harmonic motion questions.

Comprehensive and Detailed Explanation (150–250 words):

Nucleic acids (DNA and RNA) store and transmit genetic information. Proteins (A) perform enzymatic and structural roles. Carbohydrates (B) store energy. Lipids (D) form membranes. Correct: C.