CURIOUSITY QUIZ: COMBUSTION AND FLAME

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Test Your knowledge on 'Combustion and Flame' prepared exclusively according to the NCERT science curriculum for Class-8 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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The amount of heat energy produced on complete combustion of 1 kg of fuel is called :

1 point

36 °C and 98.6°F respectively

37 °C and 99.6°F respectively

39 °C and 98.6°F respectively

Calorific Value

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Which unit is generally used to express the Calorific value of a fuel?

1 point

Infrared Thermometer

kJ/kg

Digital Thermpmeter

Laboratory Thermometer

Clear selection

What unit is used to express the Calorific value of a fuel ?

1 point

(35 °C to 110 °C) and (-10 °C to 42 °C)

(-10 °C to 42 °C) and (35 °C to 110 °C)

(35 °C to 50 °C) and (0 °C to 100 °C)

kJ/kg

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The lowest temperature at which a substance catches fire is called :

1 point

It has a wide temperature range of -10 °C to 110 °C.

The temperature suddenly goes up as it is brought out of the contact of the body .

Ignition Temperature

It is not very sensitive like a clinical thermometer.

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The substances which have very low Ignition temperature and can easily catch fire with a flame are called :

1 point

It has a small temperature range of only 35 °C to 42 °C .

A Clinical thermometer is more sensitive than a Laboratory thermometer.

Inflammable Substances

It has a narrow capillary tube and small bulb compared to a laboratory thermometer.

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Combustion of substances that burn very fast producing light and heat are called :

1 point

Convection

Rapid Combustion

Both by Conduction and Convection

Radiation

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The type of combustion in which a material is suddenly ignited in the presence of oxygen and bursts into flame without the application of any apparent cause is called :

1 point

Conduction

Convection

Both Conduction and Convection

Spontaneous Combustion

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A type of combustion associated with the liberation of a large amount of gas and , hence, Pressure is called :

1 point

By conduction

By convection

Explosion

By a combined process of convection and radiation

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When a candle burns, it produces flame. On the other hand, when charcoal burns, it just becomes red hot and dies not give a flame. Why?

1 point

The hemispherical shape of the Igloo does not allow the heat from inside to pass out.

The closed spherical wall of the Igloo prevents cold air from outside to enter.

Substances which vapourize during burning gives a flame.

The Igloo is made up of ice which is a bad conductor of heat.

Clear selection

Which part of the flame is having the highest temperature ?

1 point

The two thin blankets have more surface area than a single thick blanket.

The two thin blankets have more insulating area than a single thick blanket.

The two thin blankets have more combined thickness than a single thick blanket.

Outermost complete combustible blue zone

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Which part of the flame is having the lowest temperature ?

1 point

Clouds basically consist of water vapour which is a potential greenhouse gas.

Innermost unburnt zone

Clouds retain lot of heat due to high latent heat of water that make up the cloud.

Overcast clouds increases the moisture content of the atmosphere that produces the warmth.

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When carbon particles in air increases beyond a certain level due to incomplete combustion of fuel, what kind of health hazards it poses ?

1 point

Respiratory tract problems

The metal rod acts like barrier for the heat to reach to the paper strip.

The metal rod increases the Ignition temperature of the paper strip.

The metal rod rapidly conducts away the heat received to the paper strip that is eventually radiated out.

Clear selection

Which zone of a flame does a goldsmith use for melting gold or silver ?

1 point

50°C

-50°C

40°C

Outer blue zone

Clear selection

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