EASY
9th CBSE
IMPORTANT
Earn 100

Define 1 watt of power.

Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
EASY
9th CBSE
IMPORTANT
Define average power.
EASY
9th CBSE
IMPORTANT
Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. Suma is swimming in a pond.
EASY
9th CBSE
IMPORTANT
Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back. 
EASY
9th CBSE
IMPORTANT

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

A wind-mill is lifting water from a well.

EASY
9th CBSE
IMPORTANT

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. 

A green plant is carrying out photosynthesis. 

EASY
9th CBSE
IMPORTANT

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

An engine is pulling a train.

EASY
9th CBSE
IMPORTANT

Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. 

Food grains are getting dried in the sun.