(i) Wind mill farms are constructed to produce electricity. (ii) The traditional use of energy of flowing water has been modified by establishing hydro-power plants. At hydro-power plants, the energy of falling water or flowing water is tapped by using a water turbine and then made to drive generatoRead more
(i) Wind mill farms are constructed to produce electricity.
(ii) The traditional use of energy of flowing water has been modified by establishing hydro-power plants. At hydro-power plants, the energy of falling water or flowing water is tapped by using a water turbine and then made to drive generators.
We are looking at alternate sources of energy because the fossil fuels and nuclear fuels on the earth are limited which may not last for long and the undesirable effects of pollution, both from the burning of fossil fuels and from the radioactive nuclear wastes of nuclear power plants are creating tRead more
We are looking at alternate sources of energy because the fossil fuels and nuclear fuels on the earth are limited which may not last for long and the undesirable effects of pollution, both from the burning of fossil fuels and from the radioactive nuclear wastes of nuclear power plants are creating threat to our environment.
Disadvantages of fossil fuels are: (i) The burning of fossil fuels produces large amount of carbon dioxide that causes increased greenhouse effect. (ii) The burning of fossil fuels (such as coal) produces smoke which pollutes the air. (iii) The burning of fossil fuels produces acidic gases such as sRead more
Disadvantages of fossil fuels are:
(i) The burning of fossil fuels produces large amount of carbon dioxide that causes increased greenhouse effect.
(ii) The burning of fossil fuels (such as coal) produces smoke which pollutes the air.
(iii) The burning of fossil fuels produces acidic gases such as sulphur dioxide and nitrogen oxide. These acidic gases cause acid rain that affects our water and soil resources.
(iv) Fossil fuels cannot be replenished in short time because it takes millions of years to form them.
Find the focal length of a convex mirror whose radius of curvature is 32 cm.
R = +32 cm f=R/2 =+32/2=+16cm The focal length of the given convex mirror is 16 cm.
R = +32 cm
See lessf=R/2
=+32/2=+16cm
The focal length of the given convex mirror is 16 cm.
How has the traditional use of wind and water energy been modified for our convenience?
(i) Wind mill farms are constructed to produce electricity. (ii) The traditional use of energy of flowing water has been modified by establishing hydro-power plants. At hydro-power plants, the energy of falling water or flowing water is tapped by using a water turbine and then made to drive generatoRead more
(i) Wind mill farms are constructed to produce electricity.
See less(ii) The traditional use of energy of flowing water has been modified by establishing hydro-power plants. At hydro-power plants, the energy of falling water or flowing water is tapped by using a water turbine and then made to drive generators.
Why are we looking at alternate sources of energy?
We are looking at alternate sources of energy because the fossil fuels and nuclear fuels on the earth are limited which may not last for long and the undesirable effects of pollution, both from the burning of fossil fuels and from the radioactive nuclear wastes of nuclear power plants are creating tRead more
We are looking at alternate sources of energy because the fossil fuels and nuclear fuels on the earth are limited which may not last for long and the undesirable effects of pollution, both from the burning of fossil fuels and from the radioactive nuclear wastes of nuclear power plants are creating threat to our environment.
See lessWhat are the disadvantages of fossil fuels?
Disadvantages of fossil fuels are: (i) The burning of fossil fuels produces large amount of carbon dioxide that causes increased greenhouse effect. (ii) The burning of fossil fuels (such as coal) produces smoke which pollutes the air. (iii) The burning of fossil fuels produces acidic gases such as sRead more
Disadvantages of fossil fuels are:
See less(i) The burning of fossil fuels produces large amount of carbon dioxide that causes increased greenhouse effect.
(ii) The burning of fossil fuels (such as coal) produces smoke which pollutes the air.
(iii) The burning of fossil fuels produces acidic gases such as sulphur dioxide and nitrogen oxide. These acidic gases cause acid rain that affects our water and soil resources.
(iv) Fossil fuels cannot be replenished in short time because it takes millions of years to form them.
Give any two ways in which non-biodegradable substances would affect the environment.
(i) They cause air, water and soil pollution. (ii) They may cause bio-magnification in the food chain and end up in humans.
(i) They cause air, water and soil pollution.
See less(ii) They may cause bio-magnification in the food chain and end up in humans.