question_answer2)
List two essential conditions for work to be done?
question_answer3)
When is 13 of work said to be done?
question_answer4)
What is the SI unit of work done and power?
question_answer5)
What is power? Write its SI unit.
question_answer6)
What is the work done when you apply a 10 N force on a wall?
question_answer8)
What type of energy is possessed by a Stretched rubber
band?
question_answer9)
Express kWh in joule
question_answer10)
What amount of energy in kWh is consumed in 10 h by a
machine of power 500 W?
question_answer11)
At what angle should be the displacement to get the
maximum work done by a force?
question_answer12)
How-much work is done to lift a 5 kg mass to a height of
15 m? 
.
question_answer14)
Why do we say work done against gravity is negative?
question_answer16)
How many watts are present in 1 HP?
question_answer17)
Graphically show the variation of PE and KE of a freely
falling body.
question_answer18)
A man is holding a suitcase in his hand at rest. What is
the work done by him?
question_answer21)
Give an example where a body possesses both KE as well as
PE.
question_answer22)
Write the relationship between watt and kilowatt.
question_answer23)
What is the commercial unit of energy?
question_answer24)
Give an example of negative work done.
question_answer29)
An electric fan used 20 3 of energy in 5 s. Find its
power.
question_answer32)
When an arrow is shot, where the arrow acquire its kinetic energy from?
question_answer34)
At the bottom of the waterfall, water is warmer than the
top. Give reason.
question_answer35)
Define work. State two factors on which the magnitude of
work depends.
question_answer44)
Can any object have mechanical energy even if its momentum
is zero?
question_answer62)
A bus and a car have same KE. Which of the two is moving
fast? Explain.
question_answer104)
Define
1 J of work.
question_answer105)
What
is the kinetic energy of an object?
question_answer106)
What
is power?
question_answer107)
Define
1 watt of power.
question_answer108)
Define
average power.
question_answer110)
From
where do we get energy for the life processes?
question_answer117)
Which
law was verified experimentally by James Prescott Joule?
question_answer118)
State
the law of conservation of energy.
question_answer119)
Name
the two common forms of mechanical energy.
question_answer121)
What
is negative work.
question_answer123)
What
type of energy is stored in the spring of a watch?
question_answer125)
Can
kinetic energy of a body be negative?
question_answer126)
An
electric cell converts which form of energy into which other form?
question_answer127)
Which
instrument transforms electrical energy into mechanical energy?
question_answer128)
When
an electric bulb is switched on, what energy transformation takes place?
question_answer129)
What
kind of energy transformation takes place at thermal power station?
question_answer133)
When
do we say that work is done?
question_answer135)
A
battery lights a bulb. Describe the energy changes involved in the process.
question_answer139)
Can
there be displacement of an object in the absence of any force acting on it?
question_answer143)
Give
two examples from everyday life where work is done.
question_answer145)
On
what factors the work done on a body depends?
question_answer146)
What
is energy?
question_answer148)
Give
any two uses of kinetic energy.
question_answer149)
Give
one example each of potential energy (i) due to position (ii) due to shape.
question_answer151)
What
is the commercial unit of energy?
question_answer152)
What
is the relationship between the commercial unit and SI unit of energy?
question_answer153)
Calculate
the work done against the gravity.
question_answer154)
Prove
the formula K.E. 
mv2.
question_answer158)
What
is power? How do you differentiate kilowatt from kilowatt hour?
You need to login to perform this action.
You will be redirected in
3 sec
