Assertion (A): Two identical solid cubes of side 5 cm are joined … - Vidyadip

MCQ

Assertion (A): Two identical solid cubes of side 5 cm are joined end to end. The total surface area of the resulting cuboid is 350 $cm ^2$.
Reason (R): Total surface area of a cuboid is 2(lb + bh + hl)

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

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

(B) A is false but R is true.
Explanation: A is false but R is true.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from MODEL PAPER 5 (BASIC)→MODEL PAPER 5 (BASIC) — all question types→Maths STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Directions : In the following questions, the Assertions $(A)$ and Reason $(s) \ (R)$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion : $18$ is a $\ cm$ of smallest prime and smallest odd composite natural number.
Reason : The smaller prime and composite numbers is $3 $ and $ 4.$

Directions : In the following questions, a statement of assertion $(A)$ is followed by a statement of reason $(R).$ Mark the correct choice as :
Assertion : Points $(3, 2), (-2, -3)$ and $(2, 3)$ form a right triangle.
Reason : If $(x, y)$ is equidistant from $(3, 6)$ and $(-3, 4),$ then $3x + y = 5.$

Statement-1 (A): Mid-point of a line segment divides the line segment in the ratio $1: 1$.
Statement-2 (R) : The ratio in which the point $(-3, k)$ divides the line segment joining the points $(-5,4)$ and $(-2,3)$ is $1: 2$.

Statement A (Assertion): Three unbiased coins are tossed together, then the probability of getting exactly 1 head is $\frac{3}{8}$.
Statement R (Reason) : Favourable number of outcomes do not lie in the sample space of total number of outcomes.

Statement-1 (A): For any acute angle $\theta\left(0 \leq \theta<90^{\circ}\right), \sec \theta \geq 1$
Statement-2 (R): For any acute angle $\theta\left(0<\theta \leq 90^{\circ}\right), \operatorname{cosec} \theta \geq 1$

Directions: In the following questions, a statement of assertion $(A)$ is followed by a statement of reason $(R)$. Mark the correct choice as:
Assertion: In a right angled triangle, if $\tan\theta=\frac{3}{4},$ then greatest side of the triangle is 5 units.
Reason: $(greatest side)^2 = (hypotenuse)^2 = (perpendicular)^2 + (base)^2.$

Directions : In the following questions, a statement of assertion $(A)$ is followed by a statement of reason $(R).$ Mark the correct choice as :
Assertion : $\cos^{2}\text{A}-\sin^{2}\text{A}=1,$$\tan^{2}\text{A}-\sec^{2}\text{A}=1$ are trigonometric identities.
Reason : An equation involving trigonometric ratios of an angle is called a trigonometric identity. It is true for all values of the angles involved.

Statement A (Assertion) : Both the roots of the equation $x^2-x+1=0$ are real.
Statement $R$ (Reason): The roots of the equation
$a x^2+b x+c=0$ are real if and only if $b^2-4 a c \geq 0$.

Statement A (Assertion): Sum of first 20 multiples of 4 is 480 .
Statement R (Reason) : In an A.P., sum of $n$ terms, $S_n=\frac{n}{2}[a+l]$ where, $n, a$ and $l$ are number of terms, first term and last term respectively.

Directions: In the following questions, the Assertions $(A)$ and Reason $( s )\ ( R )$ have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: The common difference of the $A.P. 19, 18, 17, ....$ is $1.$
Reason: Let $a_1, d_2, a_3, a_4, \ldots$ is an $A.P.$ Then, common difference of this $A.P$. will be the difference between any two consecutive terms, i.e., common difference $(d)=a_2-a_1$ or $a_3-d_2$ or $a_1-a_3$ and so on.