Assertion (A) >: A diamond sparkles more than a glass imitation cut to the same shape. Reason (R) >: The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct ?

examrobotsa's picture

Submitted by examrobotsa on

Q: 108 (IAS/1995)

Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct ?

question_subject: 

Science

question_exam: 

IAS

stats: 

0,60,44,24,15,60,5

keywords: 

{'refractive index': [0, 1, 1, 5], 'glass imitation': [0, 1, 0, 0], 'diamond': [0, 0, 3, 3], 'glass': [0, 0, 1, 4], 'same shape': [0, 1, 0, 0]}

Option 1 states that both A and R are true, and R is the correct explanation of A. This is incorrect, as the reason provided for the diamond`s superior sparkle (the refractive index of diamond being less than glass) is wrong.

Option 2 suggests both A and R are true, but R is not the correct explanation of A. This statement is incorrect, because while it correctly recognizes that R is not the correct explanation of A, it mistakenly treats statement R as true.

Option 3 states that A is true, but R is false. This is the correct answer. The diamond does indeed sparkle more than its glass imitation due to its high refractive index, not lower as stated in R.

Option 4 suggests that A is false, but R is true. This statement is incorrect, as the assertion about diamond`s sparkle (A) is true, and the reasoning about its refractive index (R) is false.