Physics
What is the escape velocity of the rocket in the earth?

11.2 km/sec
10.2 km/sec
13.2 km/sec
12.2 km/sec

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Physics
The Hooke's law is valid for

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

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Steel can be saved
Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train

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