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
A battery lights a bulb. Describe the energy changes involved in the process.
What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.
What is the power of a body which is doing work at the rate of one joule per second?
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
A trolley is pushed along a road with a force of 400 N through a distance of 60 m in 1 minute. Calculate the power developed.
In an experiment to measure his power, a student records the time taken by him in running up a flight of steps on a staircase. Use the following data to calculate the power of the student :
Number of steps = 28
Height of each step = 20 cm
Time taken = 5.4 s
Mass of student = 55 kg
Acceleration = 9.8 m s−2
due to gravity
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m. (g = 10 m s−2)
- How much work does he do in lifting one box?
- How much energy is transferred when one box is lifted?
- If the man lifts 4 boxes per minute, at what power is he working?
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)
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 :
