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

To prevent the steam pressure from bursting open the pouch
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 allow the heat to get into the food through the hole

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Physics
A dynamo is a device which

Creates mechanical energy
Creates electrical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy

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