EASY
9th CBSE
IMPORTANT
Earn 100

The electricity meter arranged in our home measures electric energy in the units of (kilowatt/joule/kilowatt hour).

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Important Questions on Work and Energy

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 17
A trolley is pushed along a road with a force of 400 N through a distance of 60 m in 1 minute. Calculate the power developed.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 18
What kind of energy transformations take place at a hydroelectric power station?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 19
What kind of energy transformations take place at a coal-based thermal power station?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 20
A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the power?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 21
The power output of an engine is 3 kW. How much work does the engine do in 20 s?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 22
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 23
How much electrical energy in joules does a 100 watt lamp consume in 1 second?
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Short Answer Type Questions>Q 23
How much electrical energy in joules does a 100 watt lamp consume in 1 minute?