Question # 1

Chemical reaction of oxygen with other substances is called.

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Oxidation

Reduction

Rusting

None of these

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

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Electron

Proton

Atoms

Neutron

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

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1

2

3

4

The weight of an object in Earth's gravitaional field depends on.

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Mass of the object

Acceleration due to gravity

Both a and b

None of these

What are teh products when electric current is passed through water.

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Only steam

Hydrogen and steam

Hydrogen and oxygen

Oxygen and steam

While preparing pickles, which is not used as preserating agent.

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Honey

Salt

Pepper

Vinegar

Sound is a form of.

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Energy

Wave

Frequency

intensity

The weight of an object on Earth's sufrace is 600 N, What will be its weight on the Moon's surface.

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600 N

300 N

100 N

200 N

Chemical bond in O2 is.

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Ionic

Covalent

Metallic

None of these

Letter K is used to express theshell around the nucleus of an atom.

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1st

2nd

3rd

4th

Force is

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A push

a pull

A friction

All above

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