मराठी

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

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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 उत्तर
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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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पाठ 5: Coal and Petroleum - Very Short Answer Questions [पृष्ठ २५]

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

संबंधित प्रश्‍न

Name the petroleum product used for surfacing of roads.


State any five steps to reduce the consumption of coal and petroleum products.


There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightning occurs in the sky.
(a) What are (i) fuel A, and (ii) fuel B?
(b) Name (i) C (ii) D (iii) E, and (iv) F
(c) What is the process of formation of F during lightning known as?
(d) Which fuel is supposed to be exhausted sooner : A or B?
(e) Which fuel is mostly used for generating electricity at thermal power plants?


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 is known as destructive distillation? Write about the products obtained from fractional distillation of petroleum.


Petroleum was formed from organisms


The underlined word in the following sentence have been jumbled up. Write them in their correct form.

Keenrose is a fuel used in jet crafts. 


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


Give reason for the following:

Petroleum is considered a harmful source of energy.


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