Physics
Why does'nt the hydrogen atom emit X-rays?

Its energy levels are very close to each other
It is very small in size
It is highly electropositive
It has only one electron

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Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
The person can sit on it like a raft

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Physics
The Hooke's law is valid for

Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire stress strain curve
Entire elastic region of the stress strain curve

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Physics
Air moves from the region where the air ________

Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low
Pressure is low to the region where the pressure is high
Humidity is low to the region where the humidity is high

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