Advertisements
Advertisements
Question
Which one of the following statements about power stations is not true?
Options
hydroelectric power stations use water to drive turbines
in a power station, turbines drive generators
electricity from thermal power stations differs from that produced in hydroelectric power stations
in hydroelectric power stations and thermal power stations, alternators produce electricity
Advertisements
Solution
Electricity produced in a hydroelectric power station is similar to electricity produced in thermal power plants.
Therefore, the answer is, (c) The electricity from a thermal power station differs from that produced in a hydroelectric power station.
APPEARS IN
RELATED QUESTIONS
How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall? (g = 10 m s−2)
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the power?
The power output of an engine is 3kW. How much work does the engine do in 20 s?
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : work done by the car.
A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much work does he do in lifting one box?
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much energy is transferred when one box is lifted?
An electric motor raises a load of 0.2 kg, at a constant speed, through a vertical distance of 3.0 m in 2 s. If the acceleration of free fall is 10 m/s2, the power in W developed by the motor in raising the load is :
