Multiple choice

Directions: The following items consist of two statements, one labelled as 'Assertion (A)' and the other labelled as 'Reason (R)'. You are to examine these two statements carefully and decide if the Assertion (A) and the Reason (R) are individually true and if so, whether the reason is a correct explanation of the Assertion. Select your answer to these items using the codes given below. Assertion (A) : The outer core of the earth's interior is in molten state while the inner core is in solid state. Reason (R) : The P-seismic waves disappear in outer core while S-waves penetrate up to the inner core.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are correct but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Assertion is correct - Earth's outer core is liquid (molten iron-nickel) while the inner core is solid due to immense pressure. The Reason is factually incorrect on multiple counts: P-waves do not disappear in the outer core (they refract and slow down), and S-waves cannot penetrate through the liquid outer core to reach the inner core (they are absorbed by liquid).

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