Energy and Environment MCQ Quiz in मल्याळम - Objective Question with Answer for Energy and Environment - സൗജന്യ PDF ഡൗൺലോഡ് ചെയ്യുക

The correct answer is Sun.Key Points

• The ultimate source of energy for all living organisms is the sun.
• The sun provides energy to plants through the process of photosynthesis.
• Animals then consume plants (or other animals that have consumed plants) to obtain energy.
• This energy is then used for various processes such as growth, reproduction, and movement.
• Without the sun, life on Earth would not be possible.​

Additional Information

• Soil: While soil does provide nutrients and water to plants, it is not the ultimate source of energy for living organisms.
• Water: Water is essential for life, but it is not a direct source of energy.
• Air: While oxygen is required for respiration, it is not the ultimate source of energy.

The correct answer is Heat and Light Energy.

Key Points

• Heat and light energy are two forms of energy that are closely related and often occur together.
• They both involve the transfer of energy through electromagnetic radiation, but they differ in terms of their effects and how they are perceived. 
• Heat energy, also known as thermal energy, refers to the energy associated with the motion of particles within a substance.
• It is transferred from a hotter object to a colder object through conduction, convection, or radiation. 
• Light energy, on the other hand, refers to the energy carried by electromagnetic waves that are visible to the human eye.
• It is a form of radiant energy that can be emitted, reflected, or transmitted by various sources, such as the sun, light bulbs, or flames.
• Light energy is responsible for allowing us to see and perceive our surroundings.

Concept:

• The sources of energy can be classified into two types mainly based on their availability in nature.
• They are exhaustible and inexhaustible sources of energy.

Explanation:

• The source of energy whose amount is unlimited is called inexhaustible resources.
• For example Solar energy, Wind energy, and Hydro(water) energy.
• The source of energy whose amount is limited are called exhaustible resources.
• For example fossil fuels.
• Also during power generation, they may release harmful gases into the atmosphere.
• For example, burning fossil fuels release harmful gases into the atmosphere.
• Hydro and wind energy plants are clean and they do not release harmful gases.
• Power generation occurs in these plants by using energy conversions from one form to another.
• In hydropower plants, the potential energy of water is utilised and converted into kinetic energy and then water rotates turbines and produces electricity.
• In wind power stations, the moving wind's energy is utilised in rotating the turbines and they generate electricity.

Thus, these are non-polluting sources of energy.

The correct answer is Natural Gas.

Key Points

Therefore, the correct answer is Natural Gas.

Key Points

• The gross calorific value of a gas is the quantity of heat liberated by the combustion of a unit volume of gas.
• The net calorific value of a gas is the gross calorific value minus the latent heat in the water produced by the combustion of the hydrogen in the gas (free or combined) above atmospheric temperature. 

The correct answer is greater than 1.

Key Points

• Fast breeder reactor (FBR) which uses fast (i.e. unmoderated) neutrons to breed fissile plutonium and possibly higher transuranic from fertile uranium-238.
• The fast spectrum is flexible enough that it can also breed fissile uranium-233 from thorium.
• One measure of a reactor's performance is the "conversion ratio", defined as the ratio of new fissile atoms produced to fissile atoms consumed. 
• A breeder reactor is a nuclear reactor that generates more fissile material than it consumes i.e., the ratio of fissile material produced to fissile material consumed is greater than 1.
• When the conversion ratio is greater than 1, it is often called the "breeding ratio". 

Therefore, the correct answer is greater than 1.

Explanation:

Given Data

Efficiency, Ƞ = 20% = 20/100 = 0.20

Incident Solar Radiation, S.I  = 400 W/m²

Power = 2 kW = 2000 W

Solution

Power = Ƞ x S.I x Area

2000    = 0.20 x 400 x Area

2000    = 80 x Area

Area  = 2000 / 80

Area  = 25 m²

Hence, option 2 is the correct answer.

Calculation:

Given:

The flow of water, Q = 10 m³s^-1

Speed of water, v = 3 ms^-1

Efficiency (ɳ) = 0.6

Since, Power,

P = \( {1{} \over 2}\) Q × ɳ ×1000 × v²

P = 0.5 × 10 × 0.6 ×1000 × (3)²

P = 27000 W = 27×10³ = 27 kW

Therefore, Power, P = 27 kW

Key Points

• Wind energy harnesses the power of moving air to generate electricity.
• This form of energy is considered renewable because it relies on wind, which is a naturally occurring and inexhaustible resource.
• Unlike fossil fuels, wind energy does not emit greenhouse gases during operation, making it an environmentally friendly option.
• Wind turbines convert the kinetic energy of wind into mechanical power, which can then be converted into electricity.
• Advancements in technology have made wind energy more efficient and cost-effective, contributing to its growing adoption worldwide.

Additional Information

• Wind energy is often used in conjunction with other renewable energy sources like solar power to create a more reliable and sustainable energy grid.
• The installation of wind farms can also provide economic benefits, including job creation and local investment.
• Challenges such as noise pollution and impact on wildlife are being addressed with improved turbine designs and strategic placement.

The correct answer is Heat and light energy

Explanation-

When fuels undergo combustion, chemical energy stored within the fuel molecules is converted into other forms of energy. During this process, the chemical bonds between atoms in the fuel molecules break, releasing energy in the form of heat and light. This process is known as combustion or burning.

• Light and sound energy: While combustion may produce some sound due to rapid expansion of gases, the predominant forms of energy released are heat and light, not sound. Therefore, this option is incorrect.
• Only light energy: Combustion primarily releases thermal energy (heat) and radiant energy (light). While light is a significant component, it is not the only form of energy released during combustion. Therefore, this option is incorrect.
• Heat and light energy: This option correctly identifies the two primary forms of energy released during combustion. Heat energy is produced due to the exothermic nature of the chemical reactions involved, while light energy is emitted as visible light during the process. Therefore, this option is correct.
• Mechanical and light energy: Combustion does not typically produce mechanical energy directly. While the expansion of gases during combustion might cause movement, it is not considered mechanical energy in the traditional sense. Therefore, this option is incorrect.

Conclusion- The correct answer is option 3: Heat and light energy.

The correct answer is liquefaction.

 Key Points

Therefore, the correct answer is liquefaction.