Selected MCQ

Current Question
A wheel makes 1000 revolutions covering 88 km. What is its diameter?
  • A. 14 m
  • B. 24 m
  • C. 28 m
  • D. 40 m
Correct Answer: C
Explanation:
Circumference = distance/revolutions ⇒ diameter = 28 m.
Related Question 1
A circular wheel of radius 1.75 m makes how many revolutions in 11 km?
  • A. 1000
  • B. 2000
  • C. 3000
  • D. 4000
Correct Answer: A
Explanation:
Revolutions = distance/circumference.
Related Question 2
Wheels with revolutions 15, 20 and 48 meet again after ____.
  • A. 1 min
  • B. 2 min
  • C. 3 min
  • D. None
Correct Answer: A
Explanation:
LCM concept.
Related Question 3
A wheel has a radius of 14 cm. How many revolutions will it take to cover 1056 cm?
  • A. 15
  • B. 10
  • C. 14
  • D. 12
Correct Answer: D
Explanation:
Circumference = 88 cm → 1056/88 = 12.
Related Question 4
A tower of height 15 m makes an angle of elevation 60°. Find the distance from the base.
  • A. 5 m
  • B. 8 m
  • C. 10 m
  • D. 12 m
Correct Answer: C
Explanation:
tan60 = h/d → d = 15/√3 = 10 m.
Related Question 5
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.