Test Details

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Work and Energy

Dec 15, 3:00 PM

90 minutes

Dec 15, 4:30 PM

20.0 marks

MCQ

20 questions

Madhu Naik

Class Details

Maths

Science

Class 9th

Maths

Science

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Question Text

Question 1 :
Coolie A takes $1$min to raise a box of mass m through a height of $2.0$m. another coolie B takes $30$s for the same job. Which one has greater power?

Question 3 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.

Question 4 :
The ratio of the total work done or total energy consumed to the total time taken is called:<br/>

Question 5 :
A house uses 7 tubelight of 50 W each for 5 hours a day. The electrical energy consumption for one day is:

Question 6 :
An engine lifts a load of $1200\ N$ from a depth of $200 \ m$ in 4  minutes bringing it to the ground level. The power developed by the engine is:

Question 8 :
Assertion: Kilowatt Hour is the unit of electric power Reason: KWH is a commercial unit used for expressing consumed electrical energy.

Question 10 :
The power output of a motor is 5kW. What is thework done by the motor in 5s?

Question 12 :
If $1J$ of work is done in $1s$, the power spent is equal to:

Question 14 :
A machine gun fires $420$ bullets $per\ minute$. The velocity of each of the bullets is $300 m s^{-1}$ and the mass of each bullet is $1 gm$. The power of machine gun is:

Question 15 :
A washing machine rated $300W$ is operated one and half an hour/day. If the cost of units is Rs.$3.50$, find the cost of energy to operate a washing machine for the month of September.

Question 16 :
An electric heater is rated 1500 W. How much energy does it use in 10 hours ? <br><br>

Question 18 :
Fill in the blanks:One kilowatt is equal to ________ horse power.

Question 19 :
When time taken to complete a given amount of work increases, then:

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