Physics
Which of the following parts of the sunlight makes the solar cooker hot ?

Red light
Ultra violet
Infra red
Cosmic rays

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Physics
Superconductors are substances which

conduct electricity at low temperature
offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at high temperatures

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Physics
Rainbow is due to

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

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