SSC CGL Work and Efficiency Practice Test 4
15 SSC CGL work and efficiency questions with chapter-wise explanations and exam-style options.
Leaderboard slot above the practice session for revision tools, test series, books, and career products.
SSC CGL Work and Efficiency Practice Test 4
15 SSC CGL work and efficiency questions with chapter-wise explanations and exam-style options.
Preview all 15 questions in SSC CGL Work and Efficiency Practice Test 4 (no login required)
- Work and Efficiency
1. A can do a job in 12 days and B in 18 days. Together they finish it in:
- A. 6 days
- B. 7.2 days (Correct)
- C. 8 days
- D. 9 days
Explanation: Combined rate = 1/12 + 1/18 = 5/36, so time = 36/5 days.
- Work and Efficiency
2. If A completes 1/20 of a work in one day, A alone will take:
- A. 10 days
- B. 15 days
- C. 20 days (Correct)
- D. 25 days
Explanation: Total time is the reciprocal of one-day work.
- Work and Efficiency
3. 16 workers complete a job in 15 days. 20 workers will complete it in:
- A. 10 days
- B. 12 days (Correct)
- C. 14 days
- D. 16 days
Explanation: Workers x days remains constant, so 16 x 15 / 20 = 12.
- Work and Efficiency
4. Two taps can fill a tank in 8 hours and 24 hours. Working together, they will fill it in:
- A. 5 hours
- B. 6 hours (Correct)
- C. 7 hours
- D. 8 hours
Explanation: Combined rate = 1/8 + 1/24 = 1/6.
- Work and Efficiency
5. If A is twice as efficient as B, the efficiency ratio A:B is:
- A. 1:2
- B. 2:1 (Correct)
- C. 2:3
- D. 3:2
Explanation: Twice as efficient means the ratio is 2:1.
- Work and Efficiency
6. A can finish a work in 8 days and B in 12 days. Working on alternate days starting with A, how much work is completed in the first 2 days?
- A. 1/6
- B. 5/24 (Correct)
- C. 1/3
- D. 7/24
Explanation: In one cycle, A does 1/8 and B does 1/12, so total = 5/24.
- Work and Efficiency
7. A, B, and C can finish a work in 15, 20, and 30 days. Together they finish it in:
- A. 5 days
- B. 6 days (Correct)
- C. 7 days
- D. 8 days
Explanation: Combined rate = 1/15 + 1/20 + 1/30 = 1/6.
- Work and Efficiency
8. A pipe fills a tank in 4 hours and a waste pipe empties it in 12 hours. If both are opened, the tank fills in:
- A. 4 hours
- B. 5 hours
- C. 6 hours (Correct)
- D. 8 hours
Explanation: Net rate = 1/4 - 1/12 = 1/6.
- Work and Efficiency
9. If B takes 30 days and A is 50% more efficient than B, A takes:
- A. 18 days
- B. 20 days (Correct)
- C. 22 days
- D. 24 days
Explanation: A's efficiency is 3:2, so time ratio is 2:3. A takes 20 days.
- Work and Efficiency
10. A can do a work in 30 days. After 10 days, B joins and they complete the rest in 10 more days. B alone can do the work in:
- A. 15 days
- B. 20 days
- C. 25 days
- D. 30 days (Correct)
Explanation: A does 1/3 in 10 days. Remaining 2/3 is done in 10 days, so A+B = 1/15. Since A = 1/30, B = 1/30.
- Work and Efficiency
11. 18 labourers finish a work in 10 days. 12 labourers will finish it in:
- A. 12 days
- B. 14 days
- C. 15 days (Correct)
- D. 18 days
Explanation: 18 x 10 / 12 = 15.
- Work and Efficiency
12. A tap fills 1/5 of a tank in one hour. It will fill the tank in:
- A. 4 hours
- B. 5 hours (Correct)
- C. 6 hours
- D. 10 hours
Explanation: Reciprocal of one-hour work gives total time.
- Work and Efficiency
13. A and B together complete a work in 4 days. If A alone takes 12 days, B alone takes:
- A. 4 days
- B. 5 days
- C. 6 days (Correct)
- D. 7 days
Explanation: 1/B = 1/4 - 1/12 = 1/6.
- Work and Efficiency
14. 10 men can finish a work in the same time as 15 women. Efficiency ratio of one man to one woman is:
- A. 2:3
- B. 3:2 (Correct)
- C. 4:3
- D. 5:3
Explanation: If 10 men = 15 women, then one man = 15/10 women = 3/2 women.
- Work and Efficiency
15. If A does 20% more work than B in the same time, A:B efficiency ratio is:
- A. 5:4
- B. 6:5 (Correct)
- C. 4:3
- D. 3:2
Explanation: 120:100 simplifies to 6:5.