true or false. [1 M]

Question 11 Mark

Increase in nitrogen gas in atmosphere has led to ‘global warming’.

Answer

False

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Question 21 Mark

The calorific value of hydrogen is $1,50,000\ kJ/kg.$

Answer

True

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Question 31 Mark

The middle zone of a flame has yellow colour.

Answer

True

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Question 41 Mark

Oxygen is heavier than $CO_2.$

Answer

False

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Question 51 Mark

The most common fire extinguisher is water.

Answer

True

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Question 61 Mark

Fuel, water and heat are three essential requirements for combustion.

Answer

False

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Question 71 Mark

Water is a bad conductor of electricity.

Answer

False

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Question 81 Mark

$LPG$ is an example of inflammable substances.

Answer

True

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Question 91 Mark

The ignition temperature of phosphorus is $25^\circ C.$

Answer

True

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Question 101 Mark

For combustion, a substance must attain its ignition temperature.

Answer

True

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Question 111 Mark

Kerosene is an example of solid fuel.

Answer

False

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Question 121 Mark

A matchstick only contains white phosphorus.

Answer

False

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Question 131 Mark

Wood is combustible.

Answer

True

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Question 141 Mark

Fuel may be solid, liquid or gas.

Answer

True

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Question 151 Mark

The substance that undergoes combustion is said to be combustible.

Answer

True

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Question 161 Mark

Combustion is a physical process.

Answer

False

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Question 171 Mark

Magnesium burns to produce magnesium oxide.

Answer

True

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Question 181 Mark

Coal burns with a flame.

Answer

False

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Question 191 Mark

$CNG$ means ‘Connecting Neutral Gas’.

Answer

False

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Question 201 Mark

Automobiles run only by using petrol.

Answer

False

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Science true or false. [1 M]

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