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Which of the following is not a source of geo-thermal energy?

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Important Questions on Sets, Relations and Functions

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Mathematics>Algebra>Sets, Relations and Functions>Sets and Relations
By what name is biogas popularly known in India?
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What is the condition necessary for Ocean Thermal power plants to operate?

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Name two uses biogas.
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In an examination 51% students fail in English and 45% fail in Maths. If 21%students fail in both the subjects, then 169 students pass the examination. What is the total number of students taking the exam?
 
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Solar energy is treated as the energy source of the future. Write any two solar devices working on solar energy that can be utilised in daily life.
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If A={x|x∈N,x is a prime number less than 12} and B={x|x∈N , x is factor of 10}, then A∩B=…
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The solar constant at a place is 1.4 kw/m2. The solar energy received by an area of 4 m2 per second at this place is: 
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A survey shows that 63% of the people in a city read newspaper A whereas 76% read news paper B. If  x% of the people read both the newspapers, then a possible value of x can be:
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List any three advantages and disadvantages of solar energy. 
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Give an example of non-conventional energy with the help of which electricity can be generated.

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In a group of boys, 25 play volleyball, 20 play badminton and 10 boys play cricket. Five boys play all the three games. 8 boys play atleast two of the three games. How many of them play only one game? 
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Name the two devices that work using heat energy of the sun.
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Two finite sets have m and n elements. The number of subsets of the first set is 112 more than that of the second. The values of m and n are respectively
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Let A={ 1,2,3,4,5,6,7,8,9,10 }. Then the number of subsets of A containing two or three elements is
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If A⊂B, then AΔB is equal to
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If nA=3, nB=6 and A⊆B, then the number of elements in A∪B is equal to
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A survey shows that 73% of the persons working in an office like coffee, whereas 65% like tea. If x denotes the percentage of them, who like both coffee and tea, then x cannot be:
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Write short notes on Geothermal Energy.
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Explain the working of a solar water heater with the help of a labelled diagram.
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Write names of any two energies produced in ocean.