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CBSE Notes 2011-2012 » IX-Science-Term2

# Work and Energy

## Two equal forces acting at angles 30

Multiple choice question

Two equal forces acting at angles 30

## A battery lights a bulb. The sequence of energy transfer in the process is

Multiple choice question

A battery lights a bulb. The sequence of energy
transfer in the process is

## A wristwatch works on the basis of energy possessed by

Multiple choice question

A wristwatch works on the basis of energy possessed by

## On listening to his friend, Amit said "Moon does not work as it goes round our earth," because A : M...

Multiple choice question

On listening to his friend, Amit said "Moon does
not work as it goes round our earth," because
A : Moon displaces perpendicular to direction of force
B : No force acts on the moon
C : Momentum change is non-zero.
Which of the combination is/are correct ?

## In order to prove the law of conservation of energy in a freely falling object, Nakul followed the s...

Multiple choice question

In order to prove the law of conservation of energy
in a freely falling object, Nakul followed the steps :
A: Found P.E. at the height 7i'
B : Used v2 = u2 + 2as and (h - s) to find total
energy after a fall of V metre.
C : Found K.E. just at the time of landing.
The sequence of steps are

## A boy holds a mass on his stretched hand. Then

Multiple choice question

A boy holds a mass on his stretched hand. Then