Physics
Which of the following is used to split white light into different colours ?

Glass slab
Concave lens
Prism
Convex lens

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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 microwaves to get into the food through the holes
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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Physics
Superconductors are substances which

offer high resistance to the flow of current
conduct electricity at low temperature
conduct electricity at high temperatures
offer no resistance to the flow of electricity

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