Selected MCQ

Current Question
A rope tied to a calf increases from 12 m to 23 m. How much additional area can it graze?
  • A. 1120 m²
  • B. 1250 m²
  • C. 1210 m²
  • D. 1200 m²
Correct Answer: C
Explanation:
Difference of circular areas = π(r₂² − r₁²).
Related Question 1
Side of square increases by 25%. Increase in area is ____.
  • A. 52.65%
  • B. 56.25%
  • C. 50.75%
  • D. 42.75%
Correct Answer: B
Explanation:
Area ∝ side² → (1.25)².
Related Question 2
If the side of a square is increased by 25%, then its area increases by ____.
  • A. 25%
  • B. 55%
  • C. 40.5%
  • D. 56.25%
Correct Answer: D
Explanation:
Area change = (1.25)² = 1.5625 → 56.25% increase.
Related Question 3
The population of a city increases at 4% annually, with an additional 1% increase. What is the total annual growth rate?
  • A. 10
  • B. 11
  • C. 10.25
  • D. 10.15
Correct Answer: C
Explanation:
Effective growth = 4% + 1% + (4×1)/100 = 5.04 ≈ 5.04%, but compounded gives 10.25 over period.
Related Question 4
Total area of 64 squares is 400 cm². Find the side of the big square.
  • A. 17 cm
  • B. 20 cm
  • C. 23 cm
  • D. 26 cm
Correct Answer: D
Explanation:
Total side calculation.
Related Question 5
The price of an article increases by 30% in the first year and decreases by 20% in the next year. What is the net change?
  • A. Rs. 1500
  • B. Rs. 1800
  • C. Rs. 2000
  • D. Rs. 2400
Correct Answer: C
Explanation:
Net factor = 1.3 × 0.8 = 1.04 → 4% increase.