Physics
A vacuum cleaner works on the principle of pressure difference. On the moon it will

Work with reduced efficiency
Work as efficiently as on the earth
Not work at all
Work with increased efficiency

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Physics
The blue colour of sky is due to

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

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