Q41 of 146 Page 164

An object is falling freely from a height x. After it has fallen a height, it will possess :

A. Only potential energy


B. Only kinetic energy


C. Half potential and half kinetic energy


D. Less potential and more kinetic energy

According to Law of Conservation of Energy. When the object will reach to half height it would have Potential Energy equal to that of Kinetic Energy.

More from this chapter

All 146 →
39

Which one of the following statements about power stations is not true?

A. Hydroelectric power stations use water to drive turbines


B. In a power station, turbines drive generators


C. Electricity from thermal power stations differs from that produced in hydroelectric power stations


D. In hydroelectric power stations and thermal power stations, alternators produce electricity.

 40

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 power stations and thermal power stations, alternators produce electricity

A. 0.3 B. 1.2


C. 3.0 D. 6.0

 42

The commercial unit of energy is:

A. Watt B. Watt-hour


C. Kilowatt-hour D. Kilowatt

 43

How much energy does a 100 W electric bulb transfer in 1 minute?

A. 100 J B. 600 J


C. 3600 J D. 6000 J