Test Details

Work and Energy

Science (Physics)

Feb 12, 7:30 PM

30 minutes

Feb 12, 8:00 PM

30.0 marks

MCQ

30 questions

IMRAN AHMAD

I am simple person. I believe in God.

Class Details

Science

Class 9th

Science

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Materials: Metals and Non Metals

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Microorganisms: Friend and Foe

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Crop Production And Management

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Food

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Light, Shadows and Reflections

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Water : A Precious Resource

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Question Text

Question 7 :
1 kilowatt-hour is the amount of .... by 1000 watt electric appliance when it operates for one hour.

Question 10 :
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 11 :
The power of a crane is 6.25 kW. How much mass of coal it can lift in 1 hour from a mine of 100 m depth? The efficiency of the crane is 80% and $g = 10 \ m s^{-2}$.

Question 12 :
An engine develops 10 kW of power. How much time will it take to lift a mass of 200kg to a height of 40m (g = 10 $ms^{-2}$)?

Question 16 :
A car of mass $2,000 kg$ is lifted up a distance of $30 m$ by a crane in $1\ minute$. A second crane does the same job in $2\ minutes$. The power supplied by second crane is:

Question 17 :
An X-ray tube is run at 50 kV.. the current flowing in it is 20 mA. The power of the tube is:

Question 20 :
A machine gun fires $240$ bullets $per\ minute$ with a certain velocity. If the mass of each bullet is $10 gm$ and the power of the gun is $7.2 kW$, the velocity with which each bullet is fired must be:

Question 22 :
Which of the following can be used to express energy? Symbols have their usual meanings for the units of physical quantities.<br/>(i) Wh   (ii) VC    (iii) VAs$^2$  (iv)  A$^2\Omega$s<br/>

Question 23 :
Mohan uses one television of $100$ W for $10$ hrs how much energy is consumed by Mohan.

Question 26 :
Fill in the blanks:One kilowatt is equal to ________ horse power.

Question 27 :
In our household applications, commercial unit of electricity is used. One unit is equal to:

Question 29 :
If a man of $30$ kilograms climbs stairs in $4$ seconds when height of stairs is $5$ meters, power output produced will be:<br/>

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