Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
Boiling point decreases with rise of pressure
The material of the cooker is a good conductor
It cooks the food at low pressure

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Physics
Planets are

luminous heavenly bodies revolving around a star
non-luminous heavenly bodies
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle

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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 prevent the steam pressure from bursting open 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

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