WAEC Physics 2025 Objective — Question 2
Question 2 of 51 from the West African Examinations Council (WAEC) Physics 2025 Objective paper, with the correct answer and a full explanation.
Advertisement
The diagram below illustrates a pulley system used to raise a 10kg load. If the effort F needed to raise the load is 70N, calculate the efficiency of the machine [g = 10 ms⁻²]
- A. 20.0%
- B. 35.7%Correct
- C. 50.0%
- D. 75.0%
Explanation
MA = Load/Effort = (10×10)/70 = 10/7. VR = number of pulleys/strings = 4. Efficiency = MA/VR × 100 = (10/7)/4 × 100 = 35.71%.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.