Physics
In severe winter, in cold countries water pipes burst because

Combined effect of all the above three
High atmospheric pressure
Water expands on freezing
Contraction of water pipes

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Physics
Ice is packed in saw dust because

Saw dust is a good conductor of heat.
Saw dust will not get melted easily.
Saw dust does not stick to the ice.
Saw dust is poor conductor of heat.

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves do not require a medium to propagate.

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