Physics
Water is not suitable as a calorimetric substance because it :

Is a good conductor
Has high specific heat
Has high boiling point
Low latent heat of vapourization

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Physics
Purpose of an optical filter is to

Reflect lights of different colours
Transmit or absorb light of different colours
Dispense light into component colours
Refract light of different colours

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat but a good conductor of electricity

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