WorksheetsG8 Revision of Ch 4 and 5
Total questions: 20
Worksheet time: 10mins
The organisation which gives driving tips for conservation of fuels is
CPCB
SPCB
PCRA
IARI
Naphthalene balls are obtained from coal tar and are used as
Honey bee repellent
Moth repellent
Snake repellent
Mosquito repellent
The first oil well was drilled in
USA
UK
India
Iran
Full form of LPG
Light petroleum gas
Liquified petroleum gas
Long pipe of gas
Long petroleum gas
Which of the following is also known as the ‘black gold’?
CNG
Natural gas
Coal
Petroleum
Which of the following is an example of inexhaustible resources?
Coal
Wind
Petrol
Diesel
Which of these is an exhaustible resource?
Air
Coal
Water
Sunlight
The slow process of conversion of dead vegetation into coal is called _____.
decomposition
evolution
carbonification
carbonisation
When coal burns in air then
Carbon dioxide is formed
Sulphur dioxide is formed
Carbon monoxide is formed
Hydrogen gas is formed
which one of the following gases is used in combustion?
Hydrogen
Oxygen
Carbon-dioxide
Nitrogen
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
heat value
internal value
significant value
calorific value
When magnesium ribbon burnt it produce
Magnesium hydroxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
The combustion reaction which occurs on its own, without any external supply of heat is called as (a)
Like fuel the sun also provides heat and light. The process taking place in the sun is called
combustion
nuclear process
burning
all of these
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel?
Compressed Natural Gas (CNG)
Kerosene
Petrol
Coal
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
Ignition temperature is
Lowest temperature at catch fire
Higher temperature at catch fire
Any temperature
1000 C
NAME THE HOTTEST PART OF FLAME
YELLOW REGION
INNERMOST REGION
OUTERMOST REGION
MIDDLE REGION
