Combustion and Flame-Fuel [CBSE (Central Board of Secondary Education) Class-8 Science]: Questions 1 - 6 of 17
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Question 1
Question MCQ▾
Harmful gases released during combustion are:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Water gas | |
b. | Carbon monoxide, carbon dioxide | |
c. | Producer gas | |
d. | Hydrogen, nitrogen, | |
Question 2
Question MCQ▾
Substances used for producing heat energy are called as:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Flame | |
b. | Combustion | |
c. | Fire | |
d. | Fuel | |
Question 3
Question MCQ▾
Synthetic petroleum is prepared from:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Powered coal | |
b. | Powered animal dung | |
c. | Coal gas | |
d. | Powered coke | |
Question 4
Question MCQ▾
Characteristics of ideal fuel are:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Should not leave much residue after combustion | |
b. | Proper ignition temperature | |
c. | Should not produce toxic products AND High Calorific value AND Easy to handle, cheap and easily available | |
d. | All c., b. and a. are correct | |
Question 5
Question MCQ▾
Synthetic gas is formed:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | When powdered coal is heated with hydrogen under pressure in the presence of catalyst | |
b. | Powered coke is mixed with hot solvent | |
c. | Powered coal is mixed with hot solvent | |
d. | When coke is heated with hydrogen | |
Question 6
Question MCQ▾
Full form of CNG is:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Combustion natural gas | |
b. | Compact Natural Gas | |
c. | Compressed natural gas | |
d. | Combined natural gas | |