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Question 90Asked in RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM)

Consider a pencil dipped in water in a glass beaker. If the water is replaced by kerosene or turpentine, will the pencil appear displaced to the same extent?

  1. AYes, the displacement will be the same.
  2. BYes, it will be more displaced than in water.
  3. CNo, the displacement will vary.
  4. DNo, the pencil will appear straight.
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Correct answer: (D) No, the pencil will appear straight.

Explanation

Official answer key: (4) No, the pencil will appear straight. Correct answer should be (3) No, the displacement will vary. Kerosene (n ≈ 1.44) and turpentine (n ≈ 1.47) have different refractive indices from water (n ≈ 1.33), so the pencil still looks bent, by a different amount (NCERT Class 10 activity). Scoring follows the official key.

From RRB JE CBT-1 PYQ 18 Dec 2024, Shift 2 (12:45 PM)

This is question 90 of RRB JE CBT-1 PYQ 18 Dec 2024, Shift 2 (12:45 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.