Selected MCQ

Current Question
If errors of 5% and 3% are made in measuring the sides of a rectangle, what is the percentage error in the area?
  • A. 8.35%
  • B. 7.15%
  • C. 8.15%
  • D. 6.25%
Correct Answer: C
Explanation:
Total error ≈ 5 + 3 + (5×3)/100 = 8.15%.
Related Question 1
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.
Related Question 2
The perimeter of a rectangle and a square is each 160 m. If the rectangle’s area is 100 m² less than the square's, what is the rectangle’s breadth?
  • A. 30 m
  • B. 40 m
  • C. 50 m
  • D. 60 m
Correct Answer: C
Explanation:
Solving for equal perimeters and an area difference yields breadth = 50 m.
Related Question 3
The perimeter of a square is double the perimeter of a rectangle. The area of the square ____.
  • A. 200 sq cm
  • B. 72 sq cm
  • C. 162 sq cm
  • D. Cannot be determined
Correct Answer: D
Explanation:
Without the dimensions of the rectangle, the square’s area cannot be uniquely determined.
Related Question 4
If the area of rectangle is 200 sq cm and length is 20 cm, breadth is ____.
  • A. 5 cm
  • B. 10 cm
  • C. 15 cm
  • D. 20 cm
Correct Answer: B
Explanation:
Breadth = area/length = 10.
Related Question 5
If the length of a rectangle is doubled and breadth halved, the area becomes ____.
  • A. Double
  • B. Half
  • C. Same
  • D. Four times
Correct Answer: C
Explanation:
(2L × B/2) = LB.