Assertion (A) & Reason (B) MCQ

MCQ 11 Mark

Assertion (A): Sum of first $n$ terms in an A.P. is given by the formula: $S_n=2 n \times[2 a+(n-1) d]$
Reason (R): Sum of first 15 terms of $2,5,8 \ldots$ is 345 .

✓
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.

Answer

Correct option: A.

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

(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.

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MCQ 21 Mark

Assertion (A): A piece of cloth is required to completely cover a solid object. The solid object is composed of a hemisphere and a cone surmounted on it. If the common radius is 7 m and height of the cone is $1 m, 463.39 cm^2$ is the area of cloth required.
Reason (R): Surface area of hemisphere $=2 \pi r ^2$.

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.
✓
A is true but R is false.
D
A is false but R is true.

Answer

Correct option: C.

A is true but R is false.

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Maths Assertion (A) & Reason (B) MCQ

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