SOURCE OF ENERGY
One Marks Questions
Answer: Compressed natural Gas.
Answer:
i) It maintains an unpolluted environment.
ii) Reduces the carbon dioxide content in the atmosphere.
Answer: Disadvantages are air pollution and acid rain which affect soil and water.
Answer:
i) Fossil fuels will run our or will not be replenished
ii) They are non renewable sources of energy
Answer:
(i) Used for production and proliferation of nuclear weapons.
(ii) Its generation is very expensive.
Answer: Methane and hydrogen are two combustible components of biogas.
Answer: Hot sports are placed with in the mantle where rocks melt tl generate magma.
Answer:
i) Easily accessible and easy to store.
ii) Economical and eco- friendly.
Answer: Nitrogen and phosphorus.
Two Marks Questions
Answer: A reaction in which two nuclei of lighter elements combine to form a heavy nucleus with a liberation of tremendous amount of energy is nuclear fusion reaction.
Two advantages are:
i) Large amount of energy is produced from a very small amount of fuel.
ii) Produces nonpolluting waste / does not produce gases which pollute the environment / cause green house effect.
Answer:
i) Hydrogen
ii) Hydrogen sulphide
iii) Methane
iv) Carbon dioxide
Answer:
i) Slurry is used as a manure.
ii) Slurry is rich in nitrogen and phosphorus.
Answer:
i)Very small of Uranim yields tremendous energy.
ii) The released energy can be used to produce steam and further generated electricity.
Answer:
Methane is the major constituent of biogas.
Three characteristics to prove it as an excellent fuel are
i) Smoke
ii) Leave no residue
iii) Higher heat of combustion.
Answer:
Charcoal is better fuel than food because:
i) It is smokeless and leaves no residue.
ii) It has a higher heat of combustion.
Answer:
i) Burnning of coal or petroleum products lead to air pollution.
ii) The oxides of C, N and S are released on burning fossil fuels as acidic oxides it leads to acid rain and affect water and soil.
Answer:
Fossil fuels like coal, Petroleum, natural gas, etc. if exhausted cannot be generated rapidly as they take millions of years to form again.
Two Marks Questions
Answer: A reaction in which two nuclei of lighter elements combine to form a heavy nucleus with a liberation of tremendous amount of energy is nuclear fusion reaction.
Two advantages are:
i) Large amount of energy is produced from a very small amount of fuel.
ii) Produces nonpolluting waste / does not produce gases which pollute the environment / cause green house effect.
Answer:
i) Hydrogen
ii) Hydrogen sulphide
iii) Methane
iv) Carbon dioxide
Answer:
i) Slurry is used as a manure.
ii) Slurry is rich in nitrogen and phosphorus.
Answer:
i)Very small of Uranim yields tremendous energy.
ii) The released energy can be used to produce steam and further generated electricity.
Answer:
Methane is the major constituent of biogas.
Three characteristics to prove it as an excellent fuel are
i) Smoke
ii) Leave no residue
iii) Higher heat of combustion.
Answer:
Charcoal is better fuel than food because:
i) It is smokeless and leaves no residue.
ii) It has a higher heat of combustion.
Answer:
i) Burnning of coal or petroleum products lead to air pollution.
ii) The oxides of C, N and S are released on burning fossil fuels as acidic oxides it leads to acid rain and affect water and soil.
Answer:
Fossil fuels like coal, Petroleum, natural gas, etc. if exhausted cannot be generated rapidly as they take millions of years to form again.
Three Marks Questions
Answer: Energy used is dissipated in less usable form, The energy used is consumed and cannot be used again.
Example: Burning of candle – light + heat but products cannot produced chemical energy.
Answer:
(i) Released large amount of energy on burning
ii) Easy to store
iii) Easy to transport
iv) Does not produce smoke
v) Environment friendly
Answer:
i) as cow dung cakes
ii) as biogas
Biogas is better than cow dung cakes because it has high heating capacity and are non – polluting as it burns without smokes and leaves no residue like ash , slurry left in the biogas plant is a good manure for fields.
Answer:
i) Does large amount of work per unit volume or mass.
ii) Easy to store and transport.
iii) It should be economical and easily accessible.
Answer:
An ideal source of energy has following qualities:
i) Production of large amount of heat / energy
ii) Easily accessible and easy to store within less space
iii) less or no production of toxic by products
Answer:
i) It produces large amount of heat energy.
ii) It is smokeless and pollution free.
iii) it is easy to store and transport.
Answer:
i) Criteria for selecting a good fuel:
a) Would do a large amount of work per unit volume or mass.
b) be easily accessible.
c) be easy to store and transport.
ii) Burning of fuels released gases like CO2, SO2, NO2 these causes air pollution with rain these pollutant fall as acid rain and cause soil pollution.
Answer:
i) Reason :
a) It is a traditional source of energy which is used in domestic as well as industrial area.
b) Usualy firewood is burnt in traditional chulhas.
ii) Bagasse is a residue of sugarcane after extracting juice from them.
Four Marks Questions
Answer: Hydrogen is not used as a common fuel because
i) When hydrogen is lighted it burns with an explosion.
ii) It is very difficult to store and transport hydrogen.
Hydrogen as a fuel.
Fuel cells are being developed that can store energy produced by burning hydrogen. Development of some materials that can absorb hydrogen and then release it at a steady rate.
