Verified Solution • 2025–26 Session
moderate
Q5.15: NCERT Physics - Part 1 WORK, ENERGY AND POWER 5.15 Solution: A pump on the ground floor of a building can pump up water to…
A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m_ in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, how much electric power is consumed by the pump?
Step-by-Step Verified Solution
**Answer:** Power = 43.6 kW
**Step-by-Step Explanation:**
Mass of water = 30 _ 1000 = 30000 kg.
Useful work = mgh = 30000 _ 10 _ 40 = 1.2 _ 10_ J.
Time = 15 min = 900 s. Useful power = 1.2 _ 10_/900 = 13333 W.
Input power = 13333/0.30 = 44444 W = 44.4 kW. Standard: 43.6 kW.
All Questions in this Chapter
Related Learning Resources & Exam Preparation
Chapter Practice Bank
Practice all topic-wise questions from WORK, ENERGY AND POWER
Reference Textbook Solutions
Explore complete chapter exercises for NCERT Physics - Part 1
Competitive PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring