Advertisements
Advertisements
प्रश्न
Name the material commonly used for the manufacturing of solar cells.
Advertisements
उत्तर
Silicon and Gallium. Solar cell produces d.c. current. State whether a solar cell produces a.c. or d.c. current.
संबंधित प्रश्न
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
What is the SI unit of work?
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
Work done by this force at any instant is ______.
