A source of energy is defined as the source which can provide an adequate amount of energy in a convenient form for a long period of time.The two main categories of sources of energy are:(i) Renewable source of energy.       (ii) Non-renewable source of energy.On the basis of availability, natural resources are divided ... Read More

$(a)$ Renewable Energy:A renewable source of energy is defined as the sources of energy that are being produced continuously means they are inexhaustible in nature and can be used for a very long period of time are called renewable sources of energy.Examples: Wind Energy, Solar Energy, Hydro Energy, and Biomass. Non-renewable Energy:They are non-renewable because ... Read More

Wind:The wind is the flow of air and is a source of energy. It possesses kinetic energy. Wind possesses kinetic energy, and when the fast-moving wind strikes the wind turbine it starts rotating, thus the kinetic energy of wind is converted into mechanical energy. Further, the wind turbine is connected ... Read More

Comparison and contrast between biomass and hydroelectricity as sources of energy are as follow:Biomass Hydroelectricity 1. It is generated from organic matter including wood, agricultural waste and cow dung.1. It is produced from the potential energy of water stored at a height.2. It is a renewable source of energy.2. It is also a renewable source of ... Read More

Comparison between the sun and fossil fuels as sources of energy:The SunFossil Fuels1. It produces an enormous amount of heat due to the occurrence of nuclear fusion inside it.1. They are formed from the remains of dead plants and animals.2. It does not cause any air pollution.2. They cause air pollution by burning.3. It is a renewable source of ... Read More

Correct Answer is : $(b)$ geothermal energyExplanation:Geothermal energy$\rightarrow$Geothermal energy is the heat energy obtained from hot rocks present inside the earth due to the fission of radioactive materials in it. So, it does not come directly or indirectly from the sun's energy.The term Geothermal is derived from the two Greek ... Read More

Correct Answer is : $(c)$ nuclear energyExplanation:Biomass$\rightarrow$Biomass is the organic matter like dead parts of plants and trees and the waste material of animals which are used as a fuel to produce energy. Examples of biomass energy:Wood, agricultural wastes, cow dung, and biogas are some examples of biomass energy.Nuclear energy$\rightarrow$Nuclear energy ... Read More

Correct answer is: $(b)$ a cloudy dayExplanation:A solar water heater is a device that converts solar energy into thermal energy. Without solar energy, it can't work. If a solar heater is used without sunlight, it will not work at all.On a cloudy day:A solar water heater cannot be used to get ... Read More

Given:$(2x-1, 3y+1)$ and $(x+3, y-4)$ are equal ordered pairs.To do:We have to find the values of $x$ and $y$.Solution:We know that, Two ordered pairs are equal if and only if the corresponding first components are equal and the second components are equal. Therefore, $2x-1 = x+3$ and $3y+1 = y-4$$2x-x=3+1$ and ... Read More

To do:We have to derive the formula for the volume of the frustum of a cone.Solution:Let $ABC$ be a cone.From the cone the frustum $DECB$ is cut by a plane parallel to its base.$r_1$ and $r_2$ be the radii of the frustum ends of the cone and $h$ be the ... Read More