Physics
Which one is the unit of surface tension of a liquid

None of these
Electron volt /cm2
Newton /m2
Joule/ mm

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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 elastic region of the stress strain curve
Entire stress strain curve

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Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the heat to get into the food through the hole
To allow the microwaves to get into the food through the holes
To prevent the steam pressure from bursting open the pouch
To allow the aroma of the food to come out through the holes

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