MEDIUM
9th CBSE
IMPORTANT
Earn 100

What is the necessity of using term ‘Average power instead of power?

Important Questions on Work and Energy

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Check Point 04>Q 3
Why it is required to take kilowatt-hour as commercial unit of energy?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Check Point 04>Q 4
If a 50 W bulb is lighted for 3 h daily. Give the energy consumed in 30 days.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>Check Point 04>Q 5
An electric bulb of 75 w burns for 4 h a day. What will be the cost of electricity involved in month of 30 days at ₹ 2.5 per unit.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 1
In case of negative work, the angle between the force and displacement is
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 2
A girl is carrying a school bag of 3 kgmass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g=10ms-2)
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 3
Mukesh drops a ball of 200 g from a tower of height 20 m. what will be its kinetic energy at the height of 5 m?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 4
Which mathematical relation of energy of a stone of mass m falling freely from height h remains conserved at every point in its downward motion?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 5
Which of the following is unit of power?