1.

(A) Helium is used in gas cooled nuclear reactors(R) Helium has high thermal conductivity

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Both (A) and (R) are true and (R) is the correct EXPLANATION of (A)
Both (A) and (R) are true and (R) is not the correct explanation of (A)
(A) is true but (R) is false
Both (A) and (R) are false

Answer :A


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