Physics
It is more difficult to walk on ice than on a concrete road because

Ice is soft when compared to concrete
There is very little friction between the ice and feet pressing it
There is more friction between the ice and feer
None of these

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Physics
The Hooke's law is valid for

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

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