9th Work and energy SSC

In which of the following cases, kinetic energy is changing in electric energy?

• Paddling the bicycle to cover a distance

• Driving a car to cover a distance

• Wind mill to generate electricity

• Rowing a boat in the lake

The energy stored in a compressed spring is..........

• Potential energy

• Kinetic energy

• Heat energy

• Electrical energy

Energy stored in river water is

• Potential energy

• Electrical energy

• Kinetic energy

• Chemical energy

The work done on an object does not depend on the

• Displacement

• Angle between Force and Displacement

• Initial velocity of the object

• Force applied

When an object falls freely towards the Earth, then its total energy

• decreases

• increases

• first increases then decreases

• remains constant

the form of energy possessed by the flying bird is-

• kinetic energy

• potential energy

• potential energy and kinetic energy both

• wind energy

Which one of the following is the commercial unit of energy?

• kilowatt-hour

• kilowatt

• watt-hour

• watt

in case of negative work, angle between force and work is-

• 0 degree

• 45 degree

• 90 degree

• 180 degree

which energy transformation is observed in electric cell

• electrical energy into sound energy

• chemical energy into sound energy

• sound energy into mechanical energy

• chemical energy into electrical energy

Which one of the following is the unit of energy

• newton

• kilowatt

• dyne

• joule