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

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The blood pressure of a person increases at high altitudes

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