Advertisements
Advertisements
Write the energy transformations which take place in an electric bulb (or electric lamp).
Concept: undefined >> undefined
A bulb lights up when connected to a battery. State the energy change which takes place :
Concept: undefined >> undefined
Advertisements
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Concept: undefined >> undefined
What do you understand by the term 'transformation of energy"? Explain with an example.
Concept: undefined >> undefined
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
Concept: undefined >> undefined
What is the meaning of the symbol kWh? What quantity does it represent?
Concept: undefined >> undefined
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
Concept: undefined >> undefined
Name the energy transfers which occur when :
an electric ball rings
Concept: undefined >> undefined
Name the energy transfers which occur when :
someone speaks into a microphone
Concept: undefined >> undefined
Name the energy transfers which occur when : there is a picture on a television screen
Concept: undefined >> undefined
Name the energy transfers which occur when : a torch is on
Concept: undefined >> undefined
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
Concept: undefined >> undefined
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
Concept: undefined >> undefined
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
Concept: undefined >> undefined
Give role of atmosphere in climatic control.
Concept: undefined >> undefined
When an object falls freely towards the earth, then its total energy :
Concept: undefined >> undefined
Which one of the following is not the unit of energy?
Concept: undefined >> undefined
Which of the following energy change involves frictional force?
Concept: undefined >> undefined
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
Concept: undefined >> undefined
How much energy does a 100 W electric bulb transfer in 1 minute?
Concept: undefined >> undefined
