Question # 1

A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is.

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Iron oxide

Iron sulphide

Iron Chloride

Iron Hydride

Speed of sound in water is

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1000 ms-1

1500 ms-1

900 ms-1

2000 ms-1

The speed of sound in air is.

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100 m/s

300 m/s

100 m/s

330 m/s

Components of binary solutions are.

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1

2

3

4

Which have audible range for 2 kHz and 110 kHz.

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Human

Owl

Bat

Dolphin

The weight of an object of mass 1 kg on Earth surface is

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1 N

10 N

100 N

1000 N

Force is

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A push

a pull

A friction

All above

Whcih of the following has double covalent bound.

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Br2

CO2

HCl

N2

Which of teh following is cation.

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H2

H2O

CO2

NH+4

Amount of solute required to saturae 100 g of solvent at a particular temperatur eis called.

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Molarity

Molality

Solubility

Normality

In Animals, exchange of gaes occure through.

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Liver

Heart

Brian

Lungs

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