Selected MCQ

Current Question
The perimeter of the floor of a room is 18 m. What is the area of its four walls?
  • A. 21 m²
  • B. 42 m²
  • C. 54 m²
  • D. 108 m²
Correct Answer: C
Explanation:
Area of four walls = perimeter × height (given/implied), yielding 54 m².
Related Question 1
Total cost of flooring a room at Rs. 8.50 per m² is Rs. 510. Find the area.
  • A. 7.5 m²
  • B. 8.5 m²
  • C. 10.5 m²
  • D. 12.5 m²
Correct Answer: A
Explanation:
Area = cost/rate = 510/8.5.
Related Question 2
The perimeters of a circular field and a square field are equal. If the area of the square is given, what is the area of the circle?
  • A. 15500 sq m
  • B. 15400 sq m
  • C. 15200 sq m
  • D. 15300 sq m
Correct Answer: B
Explanation:
Equating the perimeters and solving for the area yields an area ≈ of 15400 m².
Related Question 3
The perimeter of a triangle is 28 cm, and its inradius is 2.5 cm. Find its area.
  • A. 25 cm²
  • B. 42 cm²
  • C. 49 cm²
  • D. 35 cm²
Correct Answer: D
Explanation:
Area = r × semi-perimeter = 2.5 × 14 = 35 cm².
Related Question 4
The perimeter of a rhombus is 68 cm, and one diagonal is 16 cm. Find its area.
  • A. 260 cm²
  • B. 240 cm²
  • C. 280 cm²
  • D. 220 cm²
Correct Answer: B
Explanation:
Using the diagonal relation and the area formula (A = ½ d₁d₂) yields 240 cm².
Related Question 5
The perimeter of a rectangle is 60 m. If its length is twice its breadth, its area is ____.
  • A. 160 m²
  • B. 180 m²
  • C. 200 m²
  • D. 220 m²
Correct Answer: C
Explanation:
Let breadth = x, then length = 2x; solving gives area = 200 m².