(a) It is expected to harness wind power to minimum in open space.
(b) The potential energy content of wind blowing at high altitudes is the source of wind power.
(c) Wind hitting at the blades of a windmill causes them to rotate. The rotation thus achieved can be utilized further
(d) One possible method of utilizing the energy of rotational motion of the blades of a windmill is to run the turbine of an electric generator.
Ans (b)
Q.2. Acid rain happens because:
(a) sun leads to heating of upper layer of atmosphere.
(b) burning of fossil fuels release oxides of carbon, nitrogen and sulphur in the atmosphere.
(c) electrical charges are produced due to friction amongst clouds.
(d) earth atmosphere contains acids.
Ans. (b)
Q.3. In a hydro power plant
(a)potential energy possessed by stored water is converted into electricity.
(b) kinetic energy possessed by stored water is converted into potential energy.
(c) electricity is extracted from water.
(d) water is converted into steam to produce electricity.
Ans. (a)
Q.4. which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilization?
(a)nuclear energy (b) thermal energy
(c) solar energy (d) geothermal energy
Ans. (c)
Q.5. Which of the following is a non-renewable source of energy?
(a)wood (b)sun
(c)fossil fuels (d) wind
Ans.(c)
Q.6. Ocean thermal energy is due to
(a) energy stored by waves in the ocean
(b) temperature difference at different levels in the ocean
(c) Pressure difference at different levels in the ocean.
(d) Tides arising out in the ocean.
Ans(b)
Q.7. the major problem in harnessing nuclear energy is how to:
(a) Split nuclei.
(b) Sustain the reaction.
(c) Dispose off spent fuel safely.
(d) Convert nuclear energy into electrical energy.
Ans.(c)
Q.8. which is the ultimate source of energy?
(a) water (b) sun (c ) uranium (d) fossil fuels
Ans. (b)
Q.9. The main constituent of biogas is
(a) Methane (b) carbon dioxide (c) hydrogen (d)hydrogen sulphide.
Ans.(a)
Q.10. the power generated in a windmill:
(a) Is more in rainy season since damp air would mean more air mass hitting the blades.
(b) Depends on the height of the tower.
(c) Depends on wind velocity.
(d) Can be increased by planting tall trees close to the tower.
Ans. (c)
Q.11. choose the correct statement:
(a)Sun can be taken as an inexhaustible source of energy.
(b) There is infinite storage of fossil fuel inside the earth.
(c) Hydro and wind energy plants are non polluting sources of energy. (d) Waste from a nuclear power plant can be easily disposed off.
Ans.(a)
Q12. which part of the solar cooker is responsible for green house effect?
(a) coating with black colour inside the box (b) mirror
(c) glass sheet. (d) outer cover of the solar cooker
Ans.(c)
Q.13. In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because:
(a) its temperature increases.
(b) larger amount of potential energy is converted into kinetic energy.
(c) the electricity content water increases with height.
(d) more water molecules dissociate into ions.
Ans. (b).
Q.14. choose the incorrect statement:
(a) We are encouraged to plant more trees so as to ensure clean environment and also provide bio-mass fuel.
(b) Gober-gas is produced when crops,vegetable wastes etc.,decompose in the absence of oxygen.
(c) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.
(d) Bio-mass is a renewable source of energy.
Ans.(c)
Q.15. Fuel used in thermal power plants is
(a) water (b) uranium (c) biomass (d) fossil fuels
Ans. (d)
0 comments:
Post a Comment