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

Question-1
Burning of coal and diesel releases _____________ gas

(A) Hydrogen	(B) Sulfur dioxide
(C) Carbon	(D) Hydrogen peroxide

Question-2
___________ zone is the least hot and non-luminous.

(A) Innermost zone	(B) Middle zone
(C) Outermost zone	(D) Wax zone

Question-3
Which among the following is the best fuel?

(A) Wood 4000 Cal/g	(B) Coke 8000 Ca/g
(C) Coal 7000 Cal/g	(D) Kerosene 11,200 Cal/g

Question-4
A flame always points upwards because

(A) Gases produced in flame are cold	(B) Gases produced in flame are hot
(C) Hot gases are lighter and hence rise up	(D) Both b & c

Question-5
Arrange the following in terms of their increasing fuel efficiency

i) Wood,ii) Coal,iii) LPG, iv) Diesel

(A) i < ii < iv<iii	(B) ii < i < iv < iii
(C) iii < iv < ii < i	(D) iv < iii < ii< i

Question-6
The efficiency of the fuel is judged by its _________.

(A) Calorific value	(B) Burning time
(C) Energy generated	(D) None of these

Question-7
CNG stands for ___________

(A) Compressed Natural Gas	(B) Compressed Nitrogen Gas
(C) Complete Natural Gas	(D) Complete Nitrogen gas

Question-8
Which of the following are requirements for producing fire?

(A) Oxygen and heat	(B) Fuel and oxygen
(C) Fuel, oxygen and heat	(D) Fuel and heat

Question-9
Fire brigade uses which of the following first at a fire accident site?

(A) Fire extinguisher	(B) Carbon dioxide
(C) Water	(D) Sand

Question-10
Burning of a matchstick is an example of a __________.

(A) Slow Combustion	(B) Rapid Combustion
(C) Spontaneous Combustion	(D) None of these

Click here to see your answersheet and detailed track records.

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