Tag: world energy needs

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Questions Related to world energy needs

Multiple choice physics world energy needs renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

The superheated steam is raised in geothermal plants by the heat of :

  1. magma

  2. lava

  3. either (a) or (b)

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

The heat from the earth's core continuously flows outward. It transfers (conducts) to the surrounding layer of rock, the mantle. When temperatures and pressures become high enough, some mantle rock melts, becoming magma. Then, because it is lighter (less dense) than the surrounding rock, the magma rises, moving slowly up toward the earth's crust, carrying the heat from below.
Sometimes the hot magma reaches all the way to the surface, where we know it as lava. But most often the magma remains below earth's crust, heating nearby rock and water (rainwater that has seeped deep into the earth) - sometimes as hot as 700 degrees F. Some of this hot geothermal water travels back up through faults and cracks and reaches the earth's surface as hot springs or geysers, but most of it stays deep underground, trapped in cracks and porous rock. This natural collection of hot water is called a geothermal reservoir.
Hence, the super-heated steam is raised in geothermal plants by the heat of magma or lava.

Multiple choice physics world energy needs renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

State True or False :
Geothermal energy can be used to produce electricity.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The steam comes from reservoirs of hot water found a few miles or more below the earth's surface. The steam rotates a turbine that activates a generator, which produces electricity Hence Geothermal energy can be used to produce electricity.

Multiple choice physics world energy needs renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

Find the false statement from the following statements given below :-

  1. Geothermal power plants cannot operate round the clock.

  2. The initial cost in setting up Geothermal power plant will be high.

  3. Geothermal power plant uses free and renewable source of energy.

  4. Operating cost involved in a Geothermal power plant is less.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Geothermal power plants are actually known for their ability to operate continuously (base load power), unlike solar or wind, making the claim that they cannot operate round the clock false.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

In the refining of petroleum, in a fractionating column, the principle used is _______.

  1. difference in melting point

  2. difference in boiling point

  3. difference in freezing point

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fractionating column is an essential thing which is used in distillation of liquid mixtures so as to separate the mixture into its component parts, or fractions, based on the differences in their boiling temparatures. Fractionating columns are used in small scale laboratory distillation process as well as for large scale industrial distillations.

Hence option B is correct.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Which step is not present in the extraction of petroleum?

  1. Pumping

  2. Drilling

  3. Distillation

  4. Seismic survey
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Procedure for extraction of petroleum:

i) Locating the oil field or seismic survey
ii) Drilling
iii) Oil extraction and recovery ( involves pumping)
Distillation is used for extracting different petroleum products like petrol, diesel, natural gas from petroleum.
Hence, the correct option is $C$.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

________ is a process by which components in a chemical mixture are separated into different parts according to different boiling points in a fractionating column.

  1. Vacuum distillation

  2. Steam distillation

  3. Fractional distillation

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vacuum distillation is a distillation of a liquid under reduced pressure, enabling it to boil at a lower temperature than normal.

Steam distillation of a liquid in a current of steam used especially to purify liquids that are not very volatile and are immiscible with water.

Fractional distillation is a separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

Petroleum refining involves:

  1. vacuum distillation

  2. steam distillation

  3. fractional distillation

  4. fractional crystallisation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The various fractions of petroleum are separated by fractional distillation.
Fractional distillation is one separation of a mixture into its components parts, or fractions, sour as in separating chemical compounds by their boiling point by heating them to a temp at which one or more fractions of the compound will vaporize.

Multiple choice chemistry world energy needs coal petroleum non-renewable sources of energy

During fractional distillation of petroleum, different fractions are obtained. Their name, number of carbon atoms, temperature range at which it is obtained, their uses are given. There is an error in one of the alternatives. In which alternative there is an error?

  1. Petrol, ${ C } _{ 5 }to{ C } _{ 10 }$, 303K to 393K, fuel in vehicles.
  2. diesel, ${ C } _{ 15 }to{ C } _{ 18 }$, 533K to 613K, fuel in vehicles and generators.
  3. Neptha, ${ C } _{ 8 }to{ C } _{ 10 }$, 393K to 453K, solvent in petro chemicals.
  4. lubricating oil, ${ C } _{ 8 }to{ C } _{ 12 }$, 400K, fuel in high speed vehicles.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Lubricating oil,$C _{16}$ to $C _{20}$ above 613K is used as lubrication oil in machine and to prepare grease,vaseline etc.

 Therefore,lubricating oil $C _8$ to $C _{12}$,400K fuel in high speed vehicles is the correct answer.