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प्रश्न
You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?
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उत्तर
Decantation can be used to separate a mixture of petroleum and water. The mixture is allowed to stand. Petroleum is lighter than water, so it floats over water.
Carefully, lighter layer of petroleum can be poured and separated without disturbing the heavier layer of water.
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संबंधित प्रश्न
Choose one term from the following which include all others :
coal, natural gas, fossil fuels, petroleum
Name a clean gaseous fuel other than LPG and natural gas.
Fill in the following blanks with suitable words :
LPG is a ........... fuel but biogas is not a..........fuel.
Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?
What are the main uses of coal and petroleum products?
A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. This device did not work at night. It also took a lot of time for cooking.
(a) Name the device X.
(b) What is the source of energy which cooks food in this device?
(c) What is the name of the process which traps energy in this device?
(d) State one advantage (other than saving on fuel) or using such a device for cooking food.
A person buys two electrical devices P and Q for lighting purposes in his house. The device P consumes only 5 units of electricity in a month but device Q consumes 15 units of electricity in a month when used for the same number of hours daily. The device Q wastes a lot of electricity by radiating energy C but P does not do so.
(a) What type of device is (i) P, and (ii) Q?
(b) Name one component which is present in Q but not in P.
(c) Name the energy C.
(d) Which device is more energy efficient : P or Q?
(e) Which fossil fuel is most likely to be conserved if all of us switch over to devices like P?
What measures would you take to conserve electricity in your house?
Petroleum was formed from organisms
Crude oil is used as a sealant for waterproofing various surfaces.
