In solar energy, which device is used to transfer energy ?
Solar furnace
Solar panels
Solar cells
Solar power
The energy possessed by a body by virtue of its position is called
Kinetic energy
Potential energy
Chemical energy
Solar energy
Which of the following is needed to enable people, computers, machines and other devices to do work ?
Work done
Energy
Energy transfer
Power
The percentage of the energy supplied to a device is called
Fuels
Efficiency
A quantity which has both magnitude and direction is
Scalar quantity
Vector quantity
Fundamental quantity
Derived quantity
The force acting on unit area is called
Pressure
Friction
Frictional force has maximum value when
A body starts to move
A body is sliding over another body
A body has maximum temperature
A body has minimum temperature
The unit of pressure is
Newton
Joule
Pascal
Hertz
The unit of moment of force is
N
N m
N m-1
N m2
A quantity which has only magnitude is