Question # 1

When a 10 cm iron rod is heated to hgh tempeature.

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Its volume decreases

Its volume increases

Its density deceases

Its density increses

The lowest pointof a wave is................

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Crest

Amplitude

Peak

Trough

Area around nucleus where electrons are found are called.

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Orbit

Shell

Both a and b

None of these

A molecule consists of two or more

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Compounds

Atoms

Formulae

Element

Which of teh following is cation.

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H2

H2O

CO2

NH+4

Dolphins can hear sound underwater from up to ............ away

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15 km

20 km

25 km

30 km

The component of solution which is relatively large in quantity is

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Solute

Solution

Solvent

None of these

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

An object is attracted towards the Earth due to.

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Pull

Push

Friction

Gravity

The loss of water from aerial parts of the plants.

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Respiration

Photosynthesis

Evaporation

Transpiraton

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

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