Question # 1

Valency of nitrogen is

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1

2

3

4

Rusting of iron takes place in the presence of.

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Moisture

O2

Both moisture and O2

Dry air

The wavelength of red colour is.

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700 nm

800 nm

900 nm

600 nm

The central part of an atom is called.

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Electron

Proton

Neutron

Nucleus

Original colur or Nichrome wire is.

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Silver grey

Red hot

White hot

None of these

The temerature o boiling water in centigrade scale is.

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0 oC

32 oC

37 oC

100 oC

The component of solution which is relatively large in quantity is

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Solute

Solution

Solvent

None of these

The degreee of hotness or coldness is called.

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Thermal contrction

Heat

Thermal Expansion

Temperature

The Moon creates tides also in our atmosphere, they are called.

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Winds

Solar tides

Lunar wind

Tides

The contraction of the objects on cooling is due to.

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Reduction in size of the particles

Increase in size of the particles

Increase in inter particles distances

Decrease in inter particle distances

The humna circulatory system is consist of

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Heart

Blood

Blood vessels

All of these

Which of the following is insoluble in water.

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Sodium chloride

Oil

Table salt

Baking Powder

The products of respiration are carbon dioxide and.

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Water

Oxygen

Mitochondria

Chloroplast

SI unit of time is.

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S

min

hr

all above

Element present in grops have same number of ....... in their outermost shell.

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Electron

Proton

Atoms

Neutron

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