Question

these extra questions are of class 8. please answer correctly becoz i need them to prepare for my exam....​

Answer 1

Answer:

7) ans :- The minerals which are used to obtain this energy are: (i) Uranium and (ii) Thorium. The six nuclear power stations of India are – (i) Narora nuclear power station (ii) Kakrapara nuclear power station (iii) Tarapur nuclear power station (iv) Kaiga nuclear power station (v) Kalpakkam nuclear power station (vi) Rawat Bhata nuclear

8) ans:- Solar energy is radiant light and heat from the Sun that is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture, molten salt power plants and artificial photosynthesis.Solar energy can be trapped through the following:

i) Direct heating

ii) Thermoelectric conversion

iii) Photovoltaic conversion

9) ans:- Natural gas-

i) It us a non renewable sourve of energy.

ii) it is a naturally occurring gas which is formed from fossil fuel.

iii) it is forms from the breakdown of organic matters via geological process

Bio gas-

i) it is renewable source of energy.

ii) it is a naturally occuring gas that is formed from the breakdown of organic matters in the presence of anarobic bacteria.

iii) it is forms ftom the breakdown of organic matters via biological process.

10) ans:-mineral is an solid naturally occuring substance. example- iron aluminium etc.

Minerals like iron are used for constructing purpose.

Minerals like aluminium are used in making body of aeroplane etc.

Minerals like gold are used to make jewellery,coins etc.

Minerals like copper are used in making electric wires,coins, jewellery etc.

Minerals like lead is used in making batteries, ammunition etc.