EASY
9th CBSE
IMPORTANT
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As angle between directions of force and displacement increases from 0° to 90°, work done keeps on .

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Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 16
The total mechanical energy of a mass remains _____ during free fall.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 17

Electricity consumed by us in homes, offices, schools etc., is measured in _____.

(Choose from: joules/ kilowatt hour/ watt hour/ kilowatt)

MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 18

One joule= _____ erg.

(Choose one of the following: Ten to the power of six /Ten to the power of seven/ Ten to the power of eight)

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 19
No, matter what is the magnitude of mass falling from a height, its acceleration is always the same.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 20
Work done by gravity on a man moving on horizontal surface is negative.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 21
Energy does not remain conserved in an oscillating pendulum.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 22
Kinetic energy+Potential energy=Mechanical energy.
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 11 - Work and Energy>ASSESS YOURSELF>Q 25
Calculate the work done when a force of 15 N moves a body by 5 m in its direction.