Physics
If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is

24 cm
6 cm
1 cm
12 cm

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Burst after reaching some height
Continue going upwards uninterrupted
Reach a particular height and remain floating

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Physics
Rainbow is due to

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

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