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You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two? - Science

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प्रश्न

You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?

लघु उत्तरीय
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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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अध्याय 5: Coal and Petroleum - Very Short Answer Questions [पृष्ठ २५]

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एनसीईआरटी एक्झांप्लर Science [English] Class 8
अध्याय 5 Coal and Petroleum
Very Short Answer Questions | Q 13. | पृष्ठ २५

संबंधित प्रश्न

Kerosene is not a fossil fuel.


Explain the process of formation of petroleum.


Which fossil fuel is conserved when we save on electricity?


Fill in the following blanks with suitable words :
LPG is a ........... fuel but biogas is not a..........fuel.


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?


Write two disadvantages of burning fossil fuels.


What measures would you take to conserve electricity in your house?


Excessive burning of fossil fuels is a major cause of ______.


Crude oil is used as a sealant for waterproofing various surfaces.


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