combstion-flame

combstion-flame

8th Grade

25 Qs

quiz-placeholder

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combstion-flame

combstion-flame

Assessment

Quiz

Science

8th Grade

Practice Problem

Hard

Created by

karthik SK

Used 2+ times

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25 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which part of a candle flame is the hottest?

Outer zone
Middle zone
Inner zone
Dark zone

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which colour is observed in the outer zone of a candle flame?

Blue
Yellow
Red
Black

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why does the middle zone of a candle flame appear yellow?

Due to complete combustion
Due to glowing unburnt carbon particles
Due to lack of fuel
Due to presence of carbon dioxide

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What happens when a matchstick is brought near the other end of a glass tube inserted in a candle flame?

The flame is extinguished
A new flame appears
The glass tube melts
The wax solidifies

5.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Which of the following fuels has high calorific value?

Wood
Coal
Petroleum
All of the above

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the unit of calorific value?

Joules per kg
Kilojoules per kg
Newton per kg
Watts per kg

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is released during the burning of carbon fuels like coal and petroleum?

Oxygen
Unburnt carbon particles
Water vapour
Hydrogen gas

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