Physics
Magnetic keepers are used to protect magnets from :

Self-demagnetization
Earth's magnetic field
Effect of other magnets
Demagnetization due to heating

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Physics
X-rays region lies between

Ultraviolet and visible region
Visible and infra-red region
Short radio waves and long radio waves
Gamma-rays and ultraviolet region

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing data in terms of measurable physical quantities.
Interfacing synthesizer equipment.

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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 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
To allow the microwaves to get into the food through the holes

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