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Text Book Exercise Questions
The work done will be zero when the angle between force and distance is:
If the direction of motion of the force is perpendicular to the direction of motion of the body, then work done will be:
If the velocity of a body becomes double, then its kinetic energy will:
The work done in lifting a brick of mass 2 kg through a height of 5 m above the ground will be:
The kinetic energy of a body of mass 2 kg is 25 J. Its speed is:
Which one of the following converts light energy into electrical energy?
When a body is lifted through a height 'h', the work done on it appears in the form of its:
The energy stored in coal is:
The energy stored in a dam is:
In Einstein's mass-energy equation, 'c' is the:
Rate of doing work is called:
Define work. What is its SI unit?
When does a force do work? Explain.
Why do we need energy?
Define energy; give two types of mechanical energy.
Define K.E. and derive its relation.
Define potential energy and derive its relation.
Why are fossil fuels called non-renewable forms of energy?
Which form of energy is most preferred and why?
How is energy converted from one form to another? Explain.
Name the five devices that convert electrical energy into mechanical energy.
Name a device that converts mechanical energy into electrical energy.
What is meant by the efficiency of a system?
How can you find the efficiency of a system?
What is meant by the term power?
Define watt.