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Physics

Physics
Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s

0.016
2000
0.008
1000

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Physics
A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )

200J
400J
40J
20 J

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Physics
Why does a cannon recoil after firing ?

Conservation of energy
Newton's first law of motion
Backward thrust of gases produced
Newton's third law of motion

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Physics
Where does hydroelectric energy come from?

All of these
Air
Solar
Water

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Physics
Electrons carry a

Variable Charge
Negative Charge
Positive Charge
Neutral Charge

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Physics
If a barometric reading is falling, this usually indicates what

None
Decreasing pressure
Increasing pressure
No pressure

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