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 )

40J
200J
20 J
400J

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Physics
The blue colour of sky is due to

Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight

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Physics
A dynamo is a device which

Converts mechanical energy into electrical energy
Converts electrical energy into mechanical energy
Creates mechanical energy
Creates electrical energy

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