Fill in the blanks.
(a) Fossils fuels are ____ , ____ and ____
(b) Process of separation of different constituents from petroleum is called ______
(c) Least polluting fuel for vehicle is ______
(a) Fossil fuels are coal, petroleum, and natural gas
(b) Process of separation of different constituents from petroleum is called refining.
(c) Least polluting fuel for vehicle is CNG.
[Extra information: Coal is of four types based on carbon content, namely, peat, lignite, bituminous, and anthracite. The purest variety of coal is anthracite. It contains 92-98% of carbon content. Coal is used as a fuel for both domestic and industrial purposes.
Petroleum is a liquid mixture of hydrocarbons that is present in suitable rock strata and can be extracted and refined to produce fuels including petrol, paraffin, and diesel oil.
CNG is compressed natural gas. CNG consists primarily of methane but also contains ethane, propane, and heavier hydrocarbons. Natural gas is very important fossil fuel because it is easy to transport through pipes. It can be used as fuel in homes and factories. It is also used as a starting material for the manufacture of a number of chemicals and fertilizers. ]
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- Fill in the blanks:Fossil fuels are ……, ……. and ……..Process of separation of different constituents from petroleum is called ……..Least polluting fuel for vehicle is ………..
- Fill in the following blanks with suitable words:(a) Fossil fuels are…………and…….(b) Coal contains mainly……………(c) The slow process of conversion of dead vegetation into coal is called……………(d) The process of separation of different constituents from petroleum is called………………(e) The least polluting fuel for vehicles is…….(f) The burning of fossil fuels causes air………….and also leads to global……………
- Why is petroleum called a fossil fuel?
- Fill in the blanks.(a) The slow process of conversion of dead vegetation into coal is called __________.(b) Coal and petroleum are formed from the dead remains of organisms and are known as __________.(c) The black thick liquid with __________ smell is known as coal tar.(d) During the processing of coal to get coke, coal tar and __________ are also obtained.(e) The process of separating the various constituents of petroleum is known as __________.(f) Excessive burning of fossil fuels is a major cause of __________.
- (a) What is petroleum? Where does petroleum occur?(b) Describe the process of formation of petroleum.
- Fill in the blanks:(a) Cleaning of water is process of removing __________(b) Wastewater released by houses is called __________.(c) Dried __________ is used as manure.(d) Drains get blocked by __________ and __________.
- (a) What is a fuel? Give five examples of fuels.(b) What are the characteristics of an ideal fuel (or good fuel)? (c) The calorific value and ignition temperature of fuel A are 55 kJ/g and 80°C, respectively. These values for fuel B are 80 kJ/g and 10°C, respectively. On burning, the fuel A produces CO2 and H2O while the fuel B produces CO2, CO, and SO2. Give three points of relative advantages and disadvantages of these two fuels.
- Fill in the blanks with suitable words:(a) The addition of oxygen to a substance is called _______ whereas removal of oxygen is called ________.(b) The addition of hydrogen to a substance is called _______ whereas removal of hydrogen is called ________.
- Fill in the blanks:(a) The method of separating seeds of paddy from its stalks is called -------.(b) When milk cooled after boiling is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from milk is an example of --------.(c) Salt is obtained from seawater by the process of ---------(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called
- Fill in the blanks with the appropriate answers:(a) People obtain groundwater through _______ and ________.(b) Three forms of water are solid, _______ and __________.(c) The water bearing layer of the earth is __________.(d) The process of water seepage into the ground is called _________.
- Fill in the blanks with appropriate words.(a) Synthetic fibres are also called ____ or ____ fibres.(b) Synthetic fibres are synthesised from a raw material called _____(c) Like synthetic fibres, plastic is also a _____
- Fill in the blanks.(a) Coal is one of the………….used to cook food.(b) When heated in air, coal burns and produces mainly ……….gas.(c) Coal tar is a black, thick ……….with an …………. smell.(d) Petroleum, ………….. and ……….. are fossil fuels.(e) Forests and coal are ……….. natural resources.
- Fill in the blanks:(a) The method of separating the seeds of paddy from their stalks is called ______.(b) When milk, cooled after boiling, is poured onto a piece of cloth, the cream (malai) is left behind on it. This process of separating cream from milk is an example of ______.(c) Salt is obtained from sea water by the process of ____________ .(d) Impurities settled at the bottom when muddy water was kept overnight in a bucket. The clear water was then poured off from the top. The process of separation used in this example is called ____________.
- Fill in the Blanks:The process of obtaining food necessary for 0/10/1 good health and growth is called........................
- Tick True/False against the following statements.(a) Fossil fuels can be made in the laboratory.(b) CNG is more polluting fuel than petrol.(c) Coke is an almost pure form of carbon.(d) Coal tar is a mixture of various substances.(e) Kerosene is not a fossil fuel.
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