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19 & 20 , a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct answer out of the following choices :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and( R ) are true, but ( R ) is not the correct explanation of (A).
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
ASSERTION-REASON BASED QUESTIONS
In the following questions Choose the correct answer out of the following choices :
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and
(C) (A) is true, but (R) is false.
(D) (A) is false, but (R) is true.
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Question : 20
Total: 38
Assertion (A ) : If a line makes angles α , β , γ with positive direction of the coordinate axes, then s i n 2 α + s i n 2 β + s i n 2 γ = 2 .
Reason (R): The sum of squares of the direction cosines of a line is 1 .
Reason (R): The sum of squares of the direction cosines of a line is 1 .
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