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RRB Group D / RPF Constable Exam  >  RRB Group D / RPF Constable Test  >  General Science for Competitive Exams  >  Test: Sources of Energy- 3 - RRB Group D / RPF Constable MCQ

Sources of Energy- 3 - Free MCQ Practice Test with solutions, RRB Group


MCQ Practice Test & Solutions: Test: Sources of Energy- 3 (25 Questions)

You can prepare effectively for RRB Group D / RPF Constable General Science for Competitive Exams with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Sources of Energy- 3". These 25 questions have been designed by the experts with the latest curriculum of RRB Group D / RPF Constable 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 25 minutes
  • - Number of Questions: 25

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Test: Sources of Energy- 3 - Question 1
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Which of the following is a renewable source of energy ?

Detailed Solution: Question 1

Wood is used as a fuel and can be renewed by planting more trees. Whereas, all other options are obtained from fossils and hence, are non-renewable.

Test: Sources of Energy- 3 - Question 2
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The purpose of the glass cover on top of a box-type solar cooker is to

Detailed Solution: Question 2

The simple reason of covering the glass plates with solar cookers because the sunlight can pass through the glass easily and it gets absorbed inside the cooker. The more it traps the heat rays , thus it is helpful for heating the food.

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Test: Sources of Energy- 3 - Question 3
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A solar panel is made by combining a large number of

Detailed Solution: Question 3

A solar panel is created by combining a large number of solar cells. These cells convert sunlight into electricity, making them essential for solar energy systems.

Test: Sources of Energy- 3 - Question 4
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To work properly, wind-electric generators need wind speeds of at least about

Detailed Solution: Question 4

Wind Speed Requirements for Wind-Electric Generators:
To work properly, wind-electric generators require a certain minimum wind speed. Let's explore the options given and determine which one is correct.
A: 1.5 km/h
- This wind speed is too low for wind-electric generators to function properly. It is not sufficient to generate significant power.
B: 15 km/h
- This wind speed is the correct answer. Wind-electric generators typically require a wind speed of at least 15 km/h to start generating power. It is the minimum threshold for efficient operation.
C: 150 km/h
- This wind speed is too high for wind-electric generators. While they can withstand strong winds, 150 km/h is beyond their operational limit and may cause damage.
D: 1500 km/h
- This wind speed is extremely high and far beyond the capability of wind-electric generators. Such wind speeds are typically associated with severe storms and hurricanes.
Therefore, the correct answer is B: 15 km/h. Wind-electric generators need wind speeds of at least 15 km/h to work properly.

Test: Sources of Energy- 3 - Question 5
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The site of a hydroelectric plant should be chosen carefully because it

Detailed Solution: Question 5

Hydropower facilities can have large environmental impacts by changing the environment and affecting land use, homes, and natural habitats in the dam area. Most hydroelectric power plants have a dam and a reservoir.

Test: Sources of Energy- 3 - Question 6
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Electricity from the ocean can be generated based on utilizing

Detailed Solution: Question 6


The generation of electricity from the ocean is possible by harnessing the energy present in waves. This energy can be utilized to produce electricity through various methods such as wave energy converters. Additionally, the ocean also contains stored thermal energy, which can be tapped into to generate electricity using technologies like ocean thermal energy conversion (OTEC).
Here is a detailed explanation of the options:
A: Kinetic energy of the waves but not stored thermal energy
- Waves possess kinetic energy due to the motion of water particles. This energy can be harnessed using wave energy converters to generate electricity.
- However, this option states that stored thermal energy cannot be utilized, which is incorrect.
B: Stored thermal energy but not kinetic energy of the waves
- This option states that only stored thermal energy can be used to generate electricity from the ocean, neglecting the kinetic energy of the waves.
- Waves have significant kinetic energy that can be converted into electricity, making this option incorrect.
C: Kinetic energy of the waves as well as stored thermal energy
- This option correctly states that both kinetic energy of the waves and stored thermal energy can be utilized for electricity generation.
- Wave energy converters can harness the kinetic energy of waves, while OTEC systems can extract heat from the ocean's thermal gradient to generate power.
D: Neither kinetic energy of the waves nor stored thermal energy
- This option states that both kinetic energy of the waves and stored thermal energy cannot be used for electricity generation, which is incorrect.
Therefore, the correct answer is option C: Kinetic energy of the waves as well as stored thermal energy.

Test: Sources of Energy- 3 - Question 7
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Which energy is not derived from the sun ?

Detailed Solution: Question 7

Which energy is not derived from the sun?
There are various sources of energy that are not derived from the sun. The energy sources include:
Nuclear energy:
- Nuclear energy is generated through the process of nuclear fission or fusion.
- It involves the splitting or combining of atomic nuclei to release a large amount of energy.
- This energy is not directly derived from the sun.
Wind energy:
- Wind energy is harnessed by converting the kinetic energy of wind into electrical energy.
- Wind turbines capture the wind's energy and convert it into electricity.
- Although wind is indirectly influenced by the sun's radiation, wind energy does not directly come from the sun.
Biomass energy:
- Biomass energy is derived from organic materials, such as plants and animal waste.
- These organic materials can be burned or converted into biogas to produce heat or electricity.
- Biomass energy is not directly dependent on the sun.
Ocean-wave energy:
- Ocean-wave energy is obtained from the motion of ocean waves.
- Wave energy converters capture the energy from the waves and convert it into electricity.
- While waves are generated by wind, ocean-wave energy does not directly come from the sun.
Therefore, the correct answer to the question is A: Nuclear energy. Nuclear energy is not derived from the sun.

Test: Sources of Energy- 3 - Question 8
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Which of the following is not biomass ?

Detailed Solution: Question 8

Biomass refers to organic material that comes from plants and animals, and it is used as a source of energy. Here's why the Sun is not considered biomass:

  • Biomass includes organic matter like rice husk, wood, and cattle dung.
  • These materials come from living or recently living organisms.
  • The Sun is a source of energy but is not organic and does not fit the definition of biomass.

Test: Sources of Energy- 3 - Question 9
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The condition for producing biogas is

Detailed Solution: Question 9

  • The condition for producing biogas requires Water but not air.
  • This means that the process can occur effectively in the presence of water while being anaerobic, which means without air.

Therefore, Correct Answer - Option B

Test: Sources of Energy- 3 - Question 10
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Geothermal energy is feasible in regions that

Detailed Solution: Question 10


Geothermal energy is feasible in regions that:
1. Are over hot spots in the crust:
- Geothermal energy is generated by harnessing the heat from the Earth's crust, particularly in areas where there are hot spots.
- These hot spots are locations where molten magma is close to the surface, causing the surrounding rocks to heat up.
2. Have a high geothermal gradient:
- The geothermal gradient refers to the rate at which the temperature increases with depth in the Earth's crust.
- Regions with a high geothermal gradient are more suitable for geothermal energy production as they indicate a significant amount of heat available.
3. Have suitable geological conditions:
- The presence of permeable rocks or fractures in the Earth's crust is essential for the extraction of geothermal energy.
- These geological conditions allow for the circulation of water or other fluids through the hot rocks, which can be used to generate electricity or provide heating.
4. Are relatively close to the Earth's surface:
- Geothermal energy is easier to extract in regions where the hot rocks are closer to the surface.
- In such areas, drilling deep wells is not required, making the extraction process more cost-effective.
5. Have appropriate water resources:
- Geothermal power plants require a significant amount of water for the extraction and conversion of geothermal energy.
- Therefore, regions with ample water resources, such as underground reservoirs or nearby lakes and rivers, are beneficial for geothermal energy production.
6. Have supportive government policies:
- The feasibility of geothermal energy also depends on the presence of supportive government policies and regulations.
- Governments that incentivize and promote the development of geothermal energy can make it more financially viable and attractive for investors.
In conclusion, geothermal energy is feasible in regions that are over hot spots in the crust, have a high geothermal gradient, suitable geological conditions, are relatively close to the Earth's surface, have appropriate water resources, and supportive government policies.

Test: Sources of Energy- 3 - Question 11
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A solar water heater cannot be used to get hot water on

Detailed Solution: Question 11

A solar water heater is less effective on a cloudy day because it relies on sunlight to heat the water. On such days, there is insufficient solar energy to raise the water temperature effectively.

Test: Sources of Energy- 3 - Question 12
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Which of the following is not an example of a bio-mass energy source ?

Detailed Solution: Question 12

Explanation:
The correct answer is option C: nuclear energy. Here's why:
1. Wood: Wood is a widely used biomass energy source. It is derived from trees and can be burned to produce heat or converted into biofuels.
2. Gobar-gas: Gobar-gas, also known as biogas, is another example of a biomass energy source. It is produced by the anaerobic digestion of organic materials such as animal manure, crop residues, and food waste.
3. Nuclear energy: Nuclear energy is not considered a biomass energy source. It is obtained from the nucleus of an atom through processes such as nuclear fission or fusion. Unlike biomass energy sources, nuclear energy does not rely on organic materials.
4. Coal: Coal is a fossil fuel and not a biomass energy source. It is formed from the remains of plants and trees that lived millions of years ago. While coal is derived from organic matter, it undergoes geological processes that distinguish it from biomass energy sources.
In summary, while wood, gobar-gas, and coal are examples of biomass energy sources, nuclear energy is not.

Test: Sources of Energy- 3 - Question 13
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Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun's energy ?

Detailed Solution: Question 13

Explanation:
The correct answer is C: nuclear energy. Here is a detailed explanation of why nuclear energy is not ultimately derived from the Sun's energy:
1. Geothermal energy:
- Geothermal energy is generated from the heat stored within the Earth's core.
- This heat is a result of the radioactive decay of elements such as uranium and thorium.
- These radioactive elements were formed during the formation of the Earth, billions of years ago.
- Therefore, geothermal energy indirectly originates from the Sun's energy as it is a byproduct of the Earth's formation and ongoing radioactive decay.
2. Wind energy:
- Wind energy is created by the movement of air masses, which is primarily driven by the uneven heating of the Earth's surface by the Sun.
- The Sun's energy heats the Earth's surface unevenly, causing differences in air pressure.
- These pressure differences create winds as air moves from areas of high pressure to areas of low pressure.
- Thus, wind energy is a direct result of the Sun's energy.
3. Bio-mass:
- Bio-mass refers to organic matter derived from plants and animals.
- Plants use photosynthesis to convert sunlight into chemical energy, which is stored in their tissues.
- This stored energy is then transferred to other organisms through the food chain.
- When bio-mass is burned or decomposed, the stored energy is released in the form of heat or electricity.
- Therefore, bio-mass energy is ultimately derived from the Sun's energy.
4. Nuclear energy:
- Nuclear energy is generated by the process of nuclear fission or fusion.
- Nuclear fission involves splitting the nucleus of an atom, usually uranium or plutonium, which releases a large amount of energy.
- Nuclear fusion involves combining the nuclei of atoms, such as in the Sun's core, which also releases a significant amount of energy.
- However, the nuclear reactions that produce energy in nuclear power plants are not directly dependent on the Sun's energy.
- Nuclear fuel, such as uranium, is a non-renewable resource that was formed through various natural processes on Earth.
- Therefore, nuclear energy is not ultimately derived from the Sun's energy.
In summary, while most sources of energy, such as geothermal, wind, and bio-mass, are ultimately derived from the Sun's energy, nuclear energy is not. Nuclear energy is generated through nuclear fission or fusion processes that are independent of the Sun's energy.

Test: Sources of Energy- 3 - Question 14
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Which of the following is the conventional sources of energy

Detailed Solution: Question 14

Conventional sources of energy primarily refer to resources that have been widely used for a long time. These include:

  • Petroleum: A major fuel source for transportation and industry.
  • Natural Gas: Used for heating, electricity generation, and as a fuel for vehicles.

Other options like geothermal and solar energy are considered renewable sources, while wind energy is also classified as renewable. Thus, the correct answer is Option C

Test: Sources of Energy- 3 - Question 15
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How many number of neutrons are released in a fission of U – 235 ?

Detailed Solution: Question 15

Number of Neutrons Released in the Fission of U-235
To determine the number of neutrons released in the fission of U-235, we need to understand the process of nuclear fission and the specific properties of U-235.
1. Nuclear Fission:
Nuclear fission is a process in which the nucleus of an atom is split into two or more smaller nuclei. This process releases a large amount of energy and additional neutrons.
2. U-235:
Uranium-235 (U-235) is a specific isotope of uranium that is commonly used as fuel in nuclear reactors. U-235 is fissile, meaning it can undergo nuclear fission when bombarded with low-energy neutrons.
3. Neutron Induced Fission of U-235:
When U-235 absorbs a low-energy neutron, it becomes unstable and splits into two smaller nuclei, releasing a large amount of energy and additional neutrons. These released neutrons can then go on to induce fission in other U-235 nuclei, creating a chain reaction.
4. Neutron Multiplication Factor (k):
The number of neutrons released in each fission event plays a crucial role in sustaining a chain reaction. The neutron multiplication factor, denoted as "k," represents the average number of neutrons produced in each fission event that go on to cause subsequent fissions.
5. Average Number of Neutrons Released in U-235 Fission:
The average number of neutrons released in the fission of U-235 is approximately 2.5. This means that, on average, each fission event of U-235 produces 2.5 neutrons that can induce fission in other U-235 nuclei.
6. Answer:
Based on the information provided, the correct answer is D: 3.0.

Test: Sources of Energy- 3 - Question 16
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A solar water heater cannot be used on

Test: Sources of Energy- 3 - Question 17
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Which of the following is not an example of a biomass energy source ?

Detailed Solution: Question 17

Biomass energy sources are derived from organic materials. Here are some examples:

  • Wood – A common biomass source.
  • Gobar gas – Produced from animal waste, another biomass source.
  • Coal – Although it originates from organic matter, it is not considered biomass as it is not renewable.

In contrast, atomic energy comes from nuclear reactions and does not fall under biomass energy sources.

Thus, the correct answer is atomic energy.

Test: Sources of Energy- 3 - Question 18
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Which country is called the “country of winds”

Detailed Solution: Question 18

Denmark is often referred to as the "country of winds" because of its strong and consistent wind currents, especially in coastal areas. It is also a global leader in wind energy production and technology, with a significant portion of its electricity generated from wind turbines.

Test: Sources of Energy- 3 - Question 19
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Artificial satellites and space probes mainly depend upon which source of energy?

Detailed Solution: Question 19


Artificial satellites and space probes primarily rely on solar energy, as solar panels convert sunlight into electricity to power their systems. This makes solar energy the most common and effective source of energy for these technologies.


Test: Sources of Energy- 3 - Question 20
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Thermal power plant uses energy from

Detailed Solution: Question 20

A thermal power plant primarily uses energy from:

  • Coal
  • Petroleum

Although other sources like solar energy, water, biogas, and LPG are important, the main energy sources for thermal plants are coal and petroleum.Therefore, the correct answer is Option A: Coal, petroleum

Test: Sources of Energy- 3 - Question 21
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Which of the following is the odd one out ?      

Detailed Solution: Question 21

Hydro electricity is the odd one out because it is a form of renewable energy, while the others—Petroleum, Coal, and CNG—are fossil fuels.

Test: Sources of Energy- 3 - Question 22
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Which has a lowest ignition temperature-

Detailed Solution: Question 22

The fuel with the lowest ignition temperature is:

  • LPG (Liquefied Petroleum Gas)
  • Kerosene
  • Diesel
  • Petrol

LPG ignites at a lower temperature compared to the others, making it more flammable.

Test: Sources of Energy- 3 - Question 23
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The glass cover used in a solar cooker, help us to have the _________ effect in it.

Detailed Solution: Question 23

The glass cover used in a solar cooker helps to create the greenhouse effect.

Test: Sources of Energy- 3 - Question 24
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An alpha particle is nothing but a

Detailed Solution: Question 24

Explanation:
An alpha particle is a type of ionizing radiation that consists of two protons and two neutrons, making it identical to the nucleus of a helium atom. It is commonly represented as ⁴He²⁺, indicating its atomic mass of 4 and its electric charge of +2.
Key Points:
- An alpha particle is a high-energy particle emitted during certain types of radioactive decay.
- It consists of two protons and two neutrons, which gives it a mass of 4 atomic mass units.
- The presence of two protons means that it carries a charge of +2.
- The combination of two protons and two neutrons makes the alpha particle identical to the nucleus of a helium atom.
- The symbol for an alpha particle is α.
- Alpha particles have relatively low penetration power and can be stopped by a sheet of paper or a few centimeters of air.
- They are commonly emitted by radioactive elements such as uranium and radium.
Therefore, the correct answer is A: Helium nucleus.

Test: Sources of Energy- 3 - Question 25
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Which component of sunlight facilitates the drying of clothes ?

Detailed Solution: Question 25

Infrared light is the component of sunlight that facilitates the drying of clothes. It generates heat, which helps to evaporate moisture from the fabric. While ultraviolet and visible light are also part of sunlight, it is the heat from infrared light that is primarily responsible for drying.

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This test contains 25 MCQs on Sources of Energy- 3 with detailed solutions for each question. It is part of the General Science for Competitive Exams course on EduRev, designed to align with the current RRB Group D / RPF Constable syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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