Selected MCQ

Current Question
The third proportional to 3.5 and 5.6 is ____.
  • A. 8.96
  • B. 8
  • C. 4.5
  • D. 6.2
Correct Answer: A
Explanation:
Third proportional = (5.6²)/3.5.
Related Question 1
Three numbers are co-prime. The product of the first two is 551. Find the third.
  • A. 75
  • B. 81
  • C. 85
  • D. 89
Correct Answer: C
Explanation:
Factorization approach.
Related Question 2
Three numbers: 5/7 of the first equals 48% of the second, and the second is 1/9 of the third. Find first.
  • A. 168
  • B. 84
  • C. 42
  • D. 21
Correct Answer: D
Explanation:
Solve the proportion.
Related Question 3
A sphere is melted into 3 spheres. Diameters are given. Find the third diameter.
  • A. 2.66 cm
  • B. 2.5 cm
  • C. 3 cm
  • D. 3.5 cm
Correct Answer: B
Explanation:
Volume conservation applied.
Related Question 4
If radius becomes one-third but volume remains constant, length changes by ____.
  • A. 1 time
  • B. 3 times
  • C. 6 times
  • D. 9 times
Correct Answer: D
Explanation:
Volume constant → length ∝ 1/r².
Related Question 5
In a journey of 24 miles, two-thirds of the distance is covered at 40 mph. Total time taken is ____.
  • A. 14.4 min
  • B. 20 min
  • C. 28.8 min
  • D. 32 min
Correct Answer: D
Explanation:
Total time computed by segment speeds gives 32 minutes.