Physics
The magnifying power of an astronomical telescope can be decreased by

Increasing the focal length of the eyepiece
None of these
Decreasing the focal length of the eyepiece
Increasing the focal length of the objective

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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 microwaves to get into the food through the holes
To allow the heat to get into the food through the hole
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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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
mercury is a metal.

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