QuestionKart - Questions

cds- Question :

The coil in a heater is made of

A :

nichrome

B :

tungsten

C :

copper

D :

iron

cds- Question :

Why are inner lining of hot water geysers made up of copper?

A :

Copper has low heat capacity

B :

Copper has high electicity conductivity

C :

Copper does not react with steam

D :

Copper is good conduction of both heat and electricity

cds- Question :

Which one of the following elements/ions is essential in small quantities for development of healthy teeth but causes mottling of the teeth if consumed in higher quantites?

A :

Iron

B :

Chloride

C :

Fluoride

D :

Potassium

cds- Question :

When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

A :

cooling to below 0 °C

B :

heating above 100 °C

C :

passing an electric current

D :

Just keeping it for 10 minutes

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