6
Questions number $19$ and $20$ are Assertion and Reason based questions. Two statements are given, one labelled as Assertion (A) and the other is labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.
Assertion (A): Two cubes each with $12$ cm edge are joined end to end. The surface area of the resulting cuboid = $2 \times$ (surface area of one cube).
Reason (R) : The surface area of a cuboid = $2 (lb + bh + hl)$, where $l$, $b$, $h$ respectively are its length, breadth and height.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.
Assertion (A): Two cubes each with $12$ cm edge are joined end to end. The surface area of the resulting cuboid = $2 \times$ (surface area of one cube).
Reason (R) : The surface area of a cuboid = $2 (lb + bh + hl)$, where $l$, $b$, $h$ respectively are its length, breadth and height.
Show SolutionHide Solution↓
Sol. (D) Assertion (A) is false, but Reason (R) is true.