Physics
When an unbalanced force acts on an object

Causes change in motion of the object
All of these
Causes the object to move
The speed & direction of the object will change

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Physics
Rainbow is due to

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

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Physics
Circuit breaker usually operate under

After D. C. component has ceased
Sub-transient state of short-circuit current
Transient state of short-circuit current
Steady state of short-circuit current

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Physics
Lightning is produced when

Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air

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