Question # 1

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

Zince oxide is ............... solid substances.

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Red

White

Yellow

Blue

Mineral required in the formation of chlorophyll.

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Iodine

iron

Phosphorus

Magnesium

Irrigation means.

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Supply of waer to land crop

Supply of nutrients

Live stock

Farming

Exchange of gases takes place in.

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Lungs

Bronchioles

Aleoli

Blood

The part of the heart which receives blood from lungs.

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Left atrium

Right atrium

Left ventricle

Right ventricle

Positively charged atom or grouping of atoms is called.

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Anion

Cation

Neutron

Proton

Atomic number of element presetnin period 2 and group 15 of the periodic table.

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4

5

6

7

Wave are of .............. types.

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Two

Three

Four

Five

The speed of sound in air is.

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100 m/s

300 m/s

100 m/s

330 m/s

Strength of solution depends on the amount of.

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Solute

Solvent

Pressure

Temperature

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