Question # 1

Outermost shell of sodium atom has ...... electrons.

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1

2

3

4

A substance that speed up the chemical reactions is called.

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Solute

Solvent

Solution

Catalyst

The middle strong vein in leaf is called.

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Blade

Petiole

Midrib

None of these

Original colur or Nichrome wire is.

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Silver grey

Red hot

White hot

None of these

On heating sugar changes into

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Carbon

Water

Both carbon and water

Heat

SI unit of time is.

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S

min

hr

all above

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 temerature o boiling water in centigrade scale is.

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0 oC

32 oC

37 oC

100 oC

Positively charged atom or grouping of atoms is called.

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Anion

Cation

Neutron

Proton

The genetic material of virus is called.

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Genome

Coat

Capsid

Spike

Which of the following is most excellent solvent.

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Sulphuric acid

Acetic acid

Water

Ammonia

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