Question # 1

When temperature of water drops to ____________ °C it convert onto ice.

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0

-2

-1

1

Scientist used ___________ method.

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Scientific

Non-scientific

Bot

Non

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

For diagnosis of goiter in thyroid gland we use

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Co-60

C-14

I-131

Sr-90

Which one of the following is the most penetrating?

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protons

electrons

neutrons

alpha paticles

H° + H° are ________________ in energy.

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Lower

Higher

Medium

Nil

The escape of gaseous molecules one by one is called ____________.

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Diffusion

Effusion

A & b

Nil

At ____________ °C water converts to ice.

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101°

100°

99°C

100.2°C

One mole of sodium = ______ .

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24 g

25 g

26 g

23 g

Formation of water form hydrogen and oxygen is:

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Redox reaction

Acid-base reaction

Neutralization

Decomposition

PCL5 is ________________ shaped.

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Bipyromidal

Angular

Triangular

Linear

Concentration is ratio of:

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solvent to solute

solute to solution

solvent to solution

both a and b

The reverse of evaporation is:

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Boiling

Diffusion

Condensation

Freezing

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