A cuboid container has the capacity to hold 50 small boxes. If all the dimensions of the container are doubled, then it can hold (small boxes of same size)

1. 100 boxes

2. 200 boxes

3. 400 boxes

4. 800 boxes

The number of planks of dimensions (4 m × 50 cm × 20 cm) that can be stored in a pit which is 16 m long, 12 m wide and 4 m deep is

1. 1900

2. 1920

3. 1800

4. 1840

Assertion (A): Sides of a triangle are 9 cm, 12 cm and 15 cm. This triangle is both scalene triangle and right angle triangle.

Reason (R): Area of a right triangle = $\dfrac{1}{2}$ x base x height.

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).

Assertion (A): Heron's formula can be used to find the area of a scalene triangle only.

Reason (R): If ABC is a triangle with side a, b and c respectively, then its area = $\sqrt{s(s - a)(s - b)(s - c)}$, where s = $\dfrac{a + b + c}{2}$.

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).