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Sia ? 6 years, 3 months ago
You can get NCERT books here : http://ncert.nic.in/textbook/textbook.htm
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Yogita Ingle 6 years, 3 months ago
The advantages of using compressed natural gas (CNG) and liquified petroleum gas (LPG) as fuels are:
(i) They can be burnt directly.
(ii) They can be transported easily through pipelines.
(iii) They are clean fuels and do not give smoke when burnt.
(iv) They give a lot of heat energy when burnt.
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Sia ? 6 years, 3 months ago
Our earth is made up of several concentric layers with one inside another. These layers are three in number-crust, mantle and core.
- Crust:
It is the uppermost layer over the earth's surface. It is the thinnest of all the layers. It is about 35 km on the continental masses and only 5 km on the ocean floors.
The continental masses are made up of silica and alumina. It is thus called sima (si-silica and al-alumina). The oceanic crust mainly consists of silica and magnesium. It is thus called sima (si-silica and ma-magnesium).

- Mantle:
It is just beneath the crust. It extends up to a depth of 2900 km below the crust. - Core:
It is the innermost layer. Its radius is about 3500 km. It is mainly made up of nickel and iron and is known as nife (ni-nickel and fe-ferrous, i.e., iron). The central core has very high temperature and pressure.
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Sia ? 6 years, 3 months ago
P = Rs. 10500
R = 5% per annum
h = 1 year
{tex}\therefore A = P{\left( {1 - \frac{R}{{100}}} \right)^n}{/tex}
{tex} = 10500{\left( {1 - \frac{5}{{100}}} \right)^1}{/tex}
{tex} = 10500\left( {1 - \frac{1}{{20}}} \right){/tex}
{tex} = 10500 \times \frac{{19}}{{20}}{/tex}
= 9975
Hence, value after 1 years is Rs. 9975
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Conventional sources of energy are those sources that are likely to get exhausted very soon. For example oil, gas and coal.
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Mabboob Ali 3 years, 3 months ago
2Thank You