Sources of Energy Test - 8

Control rods are used in nuclear reactors to control the fission rate. Boron, silver, Indium and cadmium are capable of absorbing many neutrons without themselves fissioning, So they are used

The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion betwen the protons. Fusion reqiires temperatures about 100 million kelvin.

Silicon, cadmium telluride, selenium are some elements used to  make solar cells.

Atomic number is the number of protons present in the given element and can be calculated by subtracting neutrons from mass number

Geothermal energy is the heat from the earth. This energy is not derived by any of the action of the sun's energy. It originates from the earth itself.

Ocean thermal energy conversion is a process that can produce electricity by using the temperature difference between deep cold ocean water and warm tropical surface waters.

Yes statement A is correct as Ocean's potential energy is used in many ways and can be re-usable and statement B is wrong as fusion reactors generate large number of fast neutrons leading to large quantities of radioactive biproducrs

The value of the solar constant is approximately 1.366kilowatts per square metre. The “constant” is fairly constant, increasing by only 0.2 percent at the peak of each 11-year solar cycle.

Natural gas is primarily composed of methane, but also contains ethane, propane and heavier hydrocarbons. It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.

About 65% of the electricity consumed in India is generated by thermal power plants, 23% by hydroelectric power plants, 3% by nuclear power plants and rest by 10% from other alternate sources like solar, wind, biomass etc. 53.7% of India'scommercial energy demand is met through the country's vast coal reserves.