CBSE Std 8 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
_________ fuels occur in the same form as they occur in nature.

(A) Primary	(B) Secondary
(C) Gaseous	(D) Non-renewable

Question-2
Which word equation correctly shows how methane undergoes combustion in a plentiful supply of air?

(A) Methane → Carbon dioxide + Steam	(B) Methane + Oxygen → Carbon dioxide + Hydrogen
(C) Methane + Air → Carbon + Hydrogen	(D) Methane + Oxygen → Carbon dioxide + Steam

Question-3
Water cannot be used as fire extinguisher to put out:

(A) burning wood	(B) burning oil
(C) burning cloth	(D) burning charcoal

Question-4
A ____________ is one which is readily available, cheap and burns easily in air at a moderate rate

(A) Good fuel	(B) Ideal fuel
(C) Liquid fuel	(D) Solid fuel

Question-5
The flame of a Bunsen burner is _________, when the air hole is open and ___________ when the air hole is closed.

(A) Blue, green	(B) Yellow, blue
(C) Yellow, green	(D) Blue, yellow

Question-6
When combustion occurs, unburnt carbon particles are produced. These particles are harmful, as they cause

(A) Respiratory problems	(B) Digestion problems
(C) Heat problems	(D) Skin problems

Question-7
On the complete combustion of methane we get a material that is

(A) Acidic	(B) Basic
(C) Neutral	(D) Solid

Question-8
Which of the following has the characteristics of a good fuel?

(A) Coke	(B) Butane
(C) Coal	(D) Kerosene

Question-9
Oxides of sulfur and nitrogen dissolve in rain water and form acids such rain is called__________

(A) Acid rain	(B) Chemical rain
(C) Global warming	(D) Fuels

Question-10
In foam type extinguisher______ is present in bottle.

(A) NaHCO₃	(B) Al₂(SO₄)₃
(C) Al(OH)₃	(D) Na₂5O₄

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Std 8

CBSE

Practice in Related Chapters
Combustion,flame and fuel
Coal and Petroleum
Synthetic Fibres and Plastics
Pollution of Air and Water
Metals and Non-Metals