ICSE Grade 10 Work,Energy & Power

A falling raindrop has :

• only potential energy

• only kinetic energy

• both kinetic and potential energy

• none of these

One electron volt is equal to :

• 1.6 x 10^-10 J

• 1.6 x 10^-19 J

• 1.6 x 10^-16 J

• 6.1 x 10^-19 J

Power is given by

• Power = force x velocity

• Power = force x acceleration

• Power = force x displacement

• Power = force x time

1 H.P. =

• 766 W

• 746 W

• 764 W

• 674 W

An electric cell is a device that converts

• chemical energy to electrical energy

• light energy to electrical energy

• heat energy to electrical energy

• mechanical energy to electrical energy

1 joule =

• 10 ³ erg

• 10⁷ erg

• 10¹⁰ erg

• 10⁵ erg

A device that converts mechanical energy to electrical energy is

• motor

• heater

• bulb

• dynamo

Kilowatt hour is the commercial unit of

• electric force

• electric power

• electric energy

• time

Work done is negative if angle between force and displacement is :

• 0^o

• 90^o

• 45^o

• 180^o

Two bodies of equal mass have velocities in the ratio 2 : 1, their kinetic energies are in the ratio

• 2 : 1

• 4 : 1

• 1 : 2

• 1 : 4