Physics
If electric resistance is to be decreased, then the number of resistances should be connected in ________

Mixed arrangement
Parallel
Series
None of these

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Physics
Rainbow is due to

absorption of sunlight in minute water droplets
refraction and reflection of sunlight by water droplets
diffusion of sunlight through water droplets
ionisation of water deposits

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction

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