Question # 1

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

"×" & "." Represent:

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Shells

Neutrons

Electrons

Atoms

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

Which one is a solution?

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Carbonated drinks

Sugar

Benzene

Vineger

In volvox asexual cell produced:

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Daughter colonies

Sperm

Egg

All

It is heterogeneous mixture

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Sand

Milk

Air

Brass

Water is a ____________ covalent compound .

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Polar

Non polar

Ionic

Nil

____________ agents gains electrons in chemical reaction.

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Reduction

Oxidation

Both

None of these

Which one is an example of colloids?

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NaCl + Solution

Milk

Fog

Air

Non-metals do not reaction with

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Strong bases

Concentrated acids

Dilute acids

Salts

First energy level is denoted by:

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K

L

M

N

Long form of periodic Table is constructed the basis of:

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Mendeleev postulate

atomic number

atomic mass

mass number

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

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