11. Initially, mass m is held such that spring is in a relaxed condition. If mass m is suddenly released, maximum elongation in the spring will be?
- mg / k
- 2mg/k
- mg/2k
- mg/4k
12. The power of the water pump is 4 kW. If g = 10 m/s², the amount of water it can raise in 1 minute to a height of 20 m is (1 liter = 1Kg)
- 100 liter
- 1000 liter
- 1200 liter
- 2000 liter
13. A body is projected from ground obliquely. During downward motion, the power delivered by gravity to it
- Increases
- Decreases
- Remains constant
- First decreases and then becomes constant
14. The blades of a windmill sweep out a circle of area A. If the wind flows with velocity v perpendicular to blades of the windmill and its density is? then the mechanical power received by the windmill is?
- ρAv³/2
- ρAv²/2
- ρAv²
- 2 ρAv²
15. The power of a pump, which can pump 500 kg of water to height 100 m in 10 seconds is
- 75 Kw
- 25 kW
- 50 kW
- 500 kW
Read More ⇒ States of Matter Objective Questions