Sources of energy Worksheet-6

Sources of energy Worksheet-6


  1. Name some sources of energy.


  1. What are the two main categories of sources energy ?


  1. What is our biggest source of energy ?


  1. Name two appliances that use solar energy directly.


  1. Name two indirect ways of using solar energy.


  1. Why are solar heating devices painted black from inside?


  1. What is the use of a glass sheet in solar heating devices ?


  1. What does a windmill do ?


  1. How is hydroelectric power generated ?


  1. Name two types of energy which do not relate to the Sun.


  1. What is the value of solar constant ?


  1. What is bagasse ? To what use is it put to ?


  1. How is biogas produced?


  1. What is coke? What does it contain?


  1. Name the product obtained by the fractional distillation of crude oil which is used as a furnace fuel.


  1. Name two products obtained during fractional distillation of petroleum which are used as fuel.


  1. What is the main constituent of petroleum gas?


  1. Name the constituent which is found in natural gas as well as in biogas.


  1. What are the products obtained on destructive distillation of coal?


  1. What are fossils?



  1. Solar energy, Nuclear energy, Geothermal energy, Ocean energy, hydro-energy and Bio energy.


  1. (i) Renewable sources of energy

(ii) Non-renewable sources of energy.


  1. The Sun is the biggest source for all our energy requirements. It produces energy due to nuclear fusion.


  1. (i) Solar cooker (ii) Solar water heater.


  1. (i) Wind energy (ii) Biomass energy.


  1. Black surfaces absorb the maximum amount of heat from the solar radiation.


  1. A glass sheet allows the infrared radiation to enter the solar heating device but does not allow it to escape through it or we can say it traps the heat radiation inside the solar heating device.


  1. It converts the kinetic energy of the wind into mechanical or electrical energy.


  1. The kinetic energy of water flowing out of the gates of a dam is converted into electric energy.


  1. (i) Nuclear energy (ii) Geothermal energy.


  1. 1.4 kilojoule per second per square metre, i.e., 1.4 kW/m2 (approximately).


  1. Bagasse is the residue of sugarcane from which juice has been extracted. It is used to generate bioenergy.


  1. Biogas is produced by anaerobic degradation of biomass in the presence of water but in the absence of oxygen.


  1. Coke is a fuel which is obtained by the destructive distillation of coal. It contains carbon.


  1. Fuel oil.


  1. (i) Kerosene oil (ii) Liquefied Petroleum gas (LPG).


  1. Butane.


  1. Methane.


  1. Coke, coal tar, ammoniacal liquor and coal gas.


  1. Prehistoric remains of plants and animals which got buried under the Earth due to some natural calamity.