Selected MCQ

Current Question
After pouring petrol, tank remains 5% empty. How much is missing?
  • A. 38 liters
  • B. 40 liters
  • C. 38.5 liters
  • D. 2 liters
Correct Answer: D
Explanation:
5% of the total gives 2 liteRs.
Related Question 1
Three pipes fill a tank in 6 houRs. After 2 hours, one is closed. Remaining time is ____.
  • A. 10
  • B. 12
  • C. 14
  • D. 16
Correct Answer: C
Explanation:
Work-rate adjustment.
Related Question 2
A petrol tank lasts 10 days. If consumption patterns change, how long will it last?
  • A. 5 days
  • B. 6 days
  • C. 7 days
  • D. 8 days
Correct Answer: D
Explanation:
Adjusting the consumption rate leads to a duration of 8 days.
Related Question 3
A tap fills a tank in 6 houRs. After half filled, three more taps are opened. Total time is ____.
  • A. 3 hr 15 min
  • B. 3 hr 45 min
  • C. 4 hr
  • D. 4 hr 15 min
Correct Answer: B
Explanation:
Rate increases after half fill.
Related Question 4
A pump fills a tank in 2 houRs. Due to leakage, it takes 2⅓ houRs. How long will the leak alone empty the tank?
  • A. 4⅓ hrs
  • B. 7 hrs
  • C. 8 hrs
  • D. 14 hrs
Correct Answer: D
Explanation:
Net rate difference gives leak empties in 14 houRs.
Related Question 5
Two boys walk at 5 km/h and 5.5 km/h. Time difference after same distance is ____.
  • A. 17 hr
  • B. 14 hr
  • C. 12 hr
  • D. 19 hr
Correct Answer: A
Explanation:
Relative speed difference.