6th Class General Science Unit 8 MCQs | Energy (توانائی) | PakMCQs

Energy is correct because we need it to power all physical actions and machinery.

Energy is correct because vehicles, fans, and light bulbs require electrical or chemical energy to operate.

Industries and factories is correct because heavy machinery needs massive power to manufacture goods.

The ability to do work is correct because energy is the capacity to apply force against a resistance.

When a force causes movement of an object is correct because work requires both force and displacement.

Because it can be measured is correct because any property that is quantifiable is a physical quantity.

Joule is correct because the joule (J) is the international standard unit for energy and work.

All of the above is correct because energy can show itself as heat, light, sound, electricity, or thermal power.

Kinetic and Potential energy is correct because energy is either active due to motion or stored due to its physical position.

Kinetic energy is correct because it represents the active energy possessed by moving objects.

All of the above is correct because heat, light, sound, and electricity all involve moving particles or waves.

Zero is correct because objects at rest have no motion, meaning they possess no kinetic energy.

Because they are in motion is correct because movement is the essential requirement for having kinetic energy.

It increases is correct because kinetic energy is directly linked to velocity; the faster an object moves, the more kinetic energy it gains.

Mass is correct because a heavier object requires more work to accelerate, storing more kinetic energy as a result.

Because the truck has more mass is correct because larger mass increases the overall kinetic energy calculation.

KE = 1/2 mv² is correct because kinetic energy is calculated by multiplying half of the object's mass (m) by the square of its velocity (v²).

Potential energy is correct because it represents stored energy based on an object's physical location or state of tension.

All of the above is correct because GPE, EPE, and chemical energy are all different manifestations of stored potential energy.

It is greater is correct because gravitational potential energy increases directly with the height or altitude of an object.

Because it is at a higher position is correct because gravitational potential energy depends directly on altitude relative to the ground.

Elastic Potential Energy is correct because stretching or compressing elastic bonds stores mechanical potential energy ready to be released.

Elastic Potential Energy is correct because a bent bow has stored mechanical energy that is ready to propel an arrow forward.

Chemical energy is correct because batteries utilize stored chemical reactants to produce electrical current when connected to a circuit.

Stored energy is correct because potential energy is held in reserve by an object until it is converted into active kinetic energy.

Both (A) and (B) is correct because chemical, nuclear, gravitational, and elastic energies are all defined by their stored potential states.

Chemical potential is correct because a cell holds electrical energy in the form of chemical bonds that react when connected to a circuit.

Kinetic energy is correct because all these forms of energy involve the physical movement of waves, particles, or electrons.

Kinetic energy is correct because wind is physically air in motion, meaning it possesses kinetic energy that can spin wind turbines.

Thermal (heat) energy is correct because heat is a measure of the active kinetic energy of vibrating atoms.

Potential energy is correct because the book's elevated position stores gravitational potential energy relative to the floor.

It changes into kinetic energy is correct because as gravity pulls the book downward, its stored height energy converts into active motion energy.

Transformation of energy is correct because energy cannot be created or destroyed, only changed in form.

It remains constant is correct because the law of conservation of energy states that the total energy in a closed system never changes.

GPE to KE is correct because the stored height energy (GPE) turns into motion energy (KE) as the ball falls down.

EPE is correct because the compression of the ball stores elastic potential energy inside its deformed shape.

Heat and sound energy is correct because the collision with the floor creates a thud sound and slightly heats up the point of contact.

EPE to KE is correct because the stored elastic energy forces the ball to expand back to its round shape, producing upward motion.

KE to GPE/PE is correct because the ball's upward motion slows down and is stored as gravitational potential energy at its highest point.

Total energy remains conserved is correct because the law of conservation of energy states that the total sum of energy remains unchanged throughout any conversion.

Same height at which it started is correct because without friction, air resistance, or heat loss, all kinetic energy converts perfectly back into the original height energy.

Forever is correct because without energy dissipation as heat or sound, the mechanical cycle of bouncing would continue endlessly.

No, some part is lost is correct because real-world mechanical systems always experience friction or resistance that wastes energy as heat or sound.

10 % is correct because internal combustion engines are relatively inefficient, converting only a small fraction of chemical energy into motion.

90 % is correct because the vast majority of fuel energy is dissipated as waste heat through the exhaust and radiator system.

All of the above is correct because energy can manifest in diverse physical forms including heat, sound, radiation, motion, and chemical bonds.

Potential energy is correct because gravitational energy is stored based on an object's spatial position within a gravitational field.

When it is in a high position compared to a lower one is correct because elevation relative to a reference point increases gravitational potential.

Potential energy is correct because elastic energy is stored mechanically in the structural bonds of a deformed, flexible material.

Both (A) and (B) is correct because compressed springs and stretched elastic bands are flexible objects that hold stored mechanical force when forced out of shape.

Elastic potential energy is correct because it describes the stored mechanical energy inside a flexible object when it is temporarily deformed or stretched.

In the chemical bonds of compounds is correct because chemical energy is the potential energy stored in the electrostatic bonds holding atoms together.

During a chemical reaction is correct because breaking and forming molecular bonds releases stored energy, often as heat.

Chemical reaction is correct because striking the match ignites chemical compounds on the tip, converting stored chemical energy into thermal energy.

In the nucleus is correct because nuclear energy is held in the core of an atom by the strong nuclear force binding protons and neutrons.

Both (A) and (B) is correct because nuclear energy can be harvested by either splitting heavy nuclei (fission) or fusing light nuclei together (fusion).

Fusion reaction is correct because the Sun fuses lighter hydrogen nuclei into helium under extreme gravity, pressure, and temperature.

Fission reaction is correct because atomic weapons trigger a chain reaction that splits heavy atomic nuclei to release massive destructive energy.

Mechanical energy is correct because it encompasses both physical movement (kinetic) and stored state or height (potential) in one integrated framework.

Kinetic and Potential energy is correct because the total mechanical energy of any physical system is the sum of its active motion energy and stored position energy.

All of the above is correct because flowing streams, moving cars, active runners (kinetic) and elevated books (potential) all exhibit mechanical energy.

Electromagnetic radiation is correct because light travels through space as oscillating electric and magnetic fields.

Photons is correct because the photon is the fundamental quantum packet of electromagnetic energy representing light.

Waves and particles is correct because light exhibits a dual nature, behaving both as traveling waves and discrete energy particles.

Kinetic energy is correct because electrical energy is defined by the active, continuous physical movement of charged subatomic particles.

Electric charges (electrons) is correct because the flow of negative charges (electrons) through a conducting wire generates a usable electric current.

Electrical energy is correct because modern home machines are engineered to transform electrical power into heat, light, or mechanical motion.

Both (A) and (B) is correct because fans, lights, and refrigerators all require electricity to power their internal motors, filaments, or cooling pumps.

Vibrations moving through a medium is correct because sound requires physical particles to vibrate to generate and carry the energy.

Listener is correct because a hearing organ (such as an ear) is required to detect and translate physical air vibrations into perceived sound.

Waves is correct because sound propagates as mechanical longitudinal compression waves through air, water, or solids.

When an increase in temperature makes particles move faster is correct because thermal energy is the total kinetic energy of vibrating atoms.

Hot objects have more thermal energy is correct because higher temperature indicates their constituent atoms are vibrating with much greater speed.

Energy can neither be created nor destroyed is correct because the total quantity of energy in the cosmos is fixed and unchangeable.

It is only converted from one form to another is correct because energy merely transforms its physical state or manifestation.

Always remains the same is correct because the total sum of energy is strictly conserved throughout all conversions and transfers.

Mechanical, heat, and sound energy is correct because fuel combustion in an engine produces motion, hot exhaust gases, and sound.

Light, heat, and sound energy is correct because nuclear reactions release massive electromagnetic radiation, thermal energy, and explosive shockwaves.

Chemical energy is correct because photosynthesis in plants converts solar light energy into stored chemical energy inside food molecules.

Mechanical and heat energy is correct because electricity spins the motor blades and produces waste warmth due to friction.

Deformation, sound, and heat energy is correct because the impact bends the metal, creates sound, and warms up the nail.

Light and heat energy is correct because the bulb's filament or circuit glows bright to emit light while also producing waste thermal energy.

Life processes is correct because all metabolic, chemical, and physical activities in living organisms require energy to sustain life.

Energy resource is correct because it defines any material, natural force, or system that yields usable work energy.

Fuel is correct because fuels are substances containing stored chemical potential energy that is released during combustion.

Human energy consumption is correct because our reliance on transport, heating, and industrial technology has increased power needs over time.

Food and fuel for cooking/warmth is correct because ancient humans had basic survival needs centered around finding food and building fires.

110 times is correct because modern technology, transportation, and industrial operations demand massive energy per capita compared to ancient times.

Fossil fuels is correct because coal, petroleum oil, and natural gas currently dominate global power grids and transportation systems.

They are non-renewable and cause environmental harm is correct because burning fossil fuels releases greenhouse gases and they cannot be replenished once used up.

Renewable energy is correct because these sources naturally recharge and replenish themselves on a human timescale.

They do not run out and are naturally recycled is correct because nature continuously restores these cycles without depletion.

All of the above is correct because solar, wind, geothermal, water, and plant-based energies are all infinitely sustainable resources.

Photovoltaic cell is correct because it uses semi-conductive materials to absorb light photons and release electric current.

Solar panels is correct because they group many individual photovoltaic cells together to generate larger amounts of electric power.

Free and unlimited is correct because sunlight is a natural resource available to everyone on Earth without any cost or depletion.

Both (A) and (B) is correct because solar panels require direct, unshaded sunlight during daylight hours to generate peak electrical output.

Wind turbines is correct because they use giant spinning blades to capture the wind's kinetic energy and spin an internal generator.

Windy regions is correct because wind turbines require consistent, high-speed atmospheric wind currents to rotate their heavy blades efficiently.

Flowing water is correct because the active kinetic energy of moving water is harvested to generate electric currents.

Turbines is correct because falling water physically spins massive turbine blades, which are connected to electrical generators.

Rivers or dams is correct because building dams on active flowing rivers allows engineers to store and channel water pressure to generate power.

Plants and animals is correct because biomass consists of organic matter derived from living or recently living plant and animal organisms.

Heat or electricity is correct because burning or fermenting biomass releases stored chemical solar energy to generate warmth or drive power grids.

Both (A) and (B) is correct because liquid biodiesel (from crops) and gaseous biogas (from waste breakdown) are both forms of biomass fuel.

Because the Earth's core is hot is correct because the intense internal heat of our planet can be tapped to boil water and drive steam turbines for power.

Just a few kilometers is correct because in geologically active regions, tectonic heat sits relatively close beneath the surface crust.

Non-renewable energy is correct because these resources exist in finite amounts and decrease continuously as we consume them.

Millions of years is correct because fossil fuels form from ancient biological remains subjected to extreme heat and pressure over geological eras.

Fossil fuels and Nuclear energy is correct because coal, petroleum oil, natural gas, and uranium exist in limited quantities on Earth.

Because they will run out eventually is correct because as finite resources deplete, scarcity drives up market prices.

Both (A) and (B) is correct because coal, petroleum oil, and natural gas are the three primary geological fossil fuels.

Carbon dioxide is correct because burning carbon-rich hydrocarbons reacts with oxygen to form CO2.

Global warming is correct because carbon dioxide is a greenhouse gas that traps solar heat in the atmosphere, warming the planet.

They are harmful to the environment is correct because they produce greenhouse gases, pollution, or toxic radioactive waste.

Both (A) and (B) is correct because combustion releases soot, sulfur, and carbon, causing pollution, global warming, smog, and acid rain.

Over a short period of time is correct because resources like solar energy and wind regenerate almost immediately through natural cycles.

Available continuously is correct because natural processes like wind, sun, and water cycles do not pause indefinitely and are always present.

Yes, can be used again and again is correct because tapping into sunlight or wind does not deplete the source or consume it permanently.

Environment friendly is correct because solar, wind, and water energies do not release greenhouse gases or toxic emissions into the atmosphere.

Because they take a very long time to replenish is correct because fossil fuels take millions of years of geological heat and pressure to form.

Not available continuously is correct because once we exhaust local fossil fuel deposits, those reserves are depleted forever.

Cannot be used again and again is correct because burning coal or oil consumes the material completely, turning it into chemical waste.

Very harmful for the environment is correct because burning fossil fuels releases pollutants that cause global warming, acid rain, and smog.

Cost is low is correct because sunlight, wind, and river waters are free natural resources available without any purchase cost.

Cost is high is correct because extracting, refining, and purchasing scarce fuels like oil and gas becomes increasingly expensive over time.

35 % is correct because coal remains one of the largest heavily consumed fossil fuels globally.

29 % is correct because renewable energy technologies make up nearly one-third of the global power share.

36 % is correct because petroleum and natural gas are the primary energy sources utilized for global transport and industrial heating.

22 % is correct because water-based power represents a significant portion of clean, sustainable electricity.

23 % is correct because solar power capture represents nearly a quarter of clean energy shares in this report.

11 % is correct because biofuel represents a smaller but steady portion of organic renewable fuels.

44 % is correct because wind power represents the largest single sector of clean energy shares listed.

Global energy review 2021, IE, Paris is correct because it is the official publication from which these international energy metrics are quoted.

Extremely low / Zero is correct because solar heaters require direct solar radiation to generate thermal energy, which is absent at night.

Black absorbs more heat is correct because dark surfaces absorb almost all wavelengths of light radiation, turning them into thermal energy.

To reflect sunlight back onto the pipe is correct because the silver surface redirects passing solar rays back toward the underside of the pipe, increasing heat absorption.

Water will not get as hot is correct because a shorter pipe has less surface area exposed to the sun, reducing the total heat absorbed by the water inside.

To fit a long pipe in a small sunny space is correct because coiling packs a large heat-absorbing surface area of the pipe into a compact, sunlit area.

The capacity to do work is correct because energy represents the fundamental physical ability to cause change or move objects against resistance.

All of the above is correct because energy can manifest in many different forms including heat, light, sound, electricity, and thermal power.

Kinetic and Potential energy is correct because energy is either active in the form of physical motion (kinetic) or held in reserve (potential).

Kinetic energy is correct because it describes the active physical energy possessed by objects while they are moving.

Potential energy is correct because an object's position stores energy relative to a reference point.

Transformation of energy is correct because it defines the phase and type transitions of energy from one state to another.

Total energy is correct because the total quantity of energy in a closed system never increases or decreases during conversions.

Be created or destroyed is correct because the universe's total energy is immutable; we can only change its form.

Non-renewable and Renewable resources is correct because conventional means traditional limited fuels, and non-conventional means modern infinite natural forces.

All of the above is correct because solar, wind, hydro, biomass, and geothermal sources do not run out and are continuously replenished.

They come from natural sources that do not replenish quickly is correct because once used up, fossil fuels cannot regenerate within a human lifespan.

Natural gas is correct because it is a fossil fuel that exists in limited quantities on Earth and cannot replenish quickly.

Chemical is correct because the match head contains stored chemical energy that undergoes a reaction when struck to release heat.

Zero is correct because kinetic energy is the energy of motion, and an object at complete rest has no speed.

Thermal is correct because heat (thermal energy) from the warmer surrounding air transfers into the colder ice cream.

Electrical energy is correct because a microwave oven must draw electrical current from a wall outlet to power its circuits and produce waves.

Chemical → Electrical → Light is correct because batteries store chemical energy, which converts to electrical current, and finally powers the bulb to emit light.

Non-renewable is correct because coal, oil, and gas deposits are finite on Earth and cannot be replenished once fully consumed.

Wood is correct because wood is an organic material harvested from living trees, classifying it as a solid biomass fuel.

Moving charges is correct because electrical current is generated by the continuous physical flow of charged electrons through a conductor.

Burning is correct because hydropower relies on water flow driven by gravity and the water cycle, not on combustion or burning fuel.