CBSE Class-8 Science: Questions 128 - 133 of 469

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Question number: 128

» Combustion and Flame » Fire » Fire Extinguisher

MCQ▾

Question

Fire extinguishers used at airports and petrol pumps based on the principle of:

Choices

Choice (4) Response

a.

Cooling the fire

b.

Smothering the fire

c.

Question does not provide sufficient data or is vague

d.

None of the above

Question number: 129

» Coal and Petroleum » Natural Resources » Inexhaustible Natural Resources

MCQ▾

Question

Inexhaustible natural resources are:

Choices

Choice (4) Response

a.

Resources which are present in unlimited quantity

b.

Resources which are present in limited quantity

c.

A natural resource is anything in or above the earth that people use

d.

It is a fossil fuel

Question number: 130

» Coal and Petroleum » Petroleum » Constituents of Petroleum & Their Uses

MCQ▾

Question

Paraffin wax is used for:

Choices

Choice (4) Response

a.

As a grease

b.

For air proofing in laboratories

c.

Making candles, boot polish

d.

All a. , b. and c. are correct

Question number: 131

» Coal and Petroleum » Natural Resources » Inexhaustible Natural Resources

MCQ▾

Question

Inexhaustible resources are also called as:

Choices

Choice (4) Response

a.

Renewable resources

b.

Fossil fuels

c.

Non-living resources

d.

Non-renewable resources

Question number: 132

» Combustion and Flame » Combustion » Inflammable Substances

MCQ▾

Question

The substances with low ignition temperature are called as:

Choices

Choice (4) Response

a.

Flammable substance

b.

Fuel

c.

Inflammable substance

d.

All of the above

Question number: 133

» Coal and Petroleum » Petroleum » Natural Gas

MCQ▾

Question

Composition of natural gas is:

Choices

Choice (4) Response

a.

Mixture of hydrogen, methane and carbon monoxide

b.

Hydrocarbons mixed with oxygen, sulphur, nitrogen and other elements in varying proportion

c.

Methane with traces of ethane and propane

d.

It contains more than 90 % carbon and is porous and black

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