Introduction:
Work, Power, and Energy are fundamental concepts in physics that explain how forces interact with objects and how motion occurs. Work is done when a force causes displacement in an object. Energy is the capacity to do work and exists in various forms such as kinetic and potential energy. Power measures the rate at which work is done or energy is transferred. These concepts are closely related and are essential for understanding everyday phenomena, from simple machines to complex systems.
Here are 100+ Work, Power and Energy GK Questions and Answers:
Q.1 What is work in physics?
Answer: Work is done when a force causes displacement in an object.
Q.2 What is the SI unit of work?
Answer: Joule (J)
Q.3 Define energy —
Answer: Energy is the capacity to do work.
Q.4 What is the SI unit of energy?
Answer: Joule (J)
Q.5 What is power?
Answer: Power is the rate of doing work.
Q.6 What is the SI unit of power?
Answer: Watt (W)
Q.7 What is 1 Watt equal to?
Answer: 1 Joule per second (J/s)
Q.8 What type of quantity is work?
Answer: Scalar quantity
Q.9 What type of quantity is power?
Answer: Scalar quantity
Q.10 When is work said to be zero?
Answer: When displacement is zero or force is perpendicular to displacement.
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Q.11 What is kinetic energy?
Answer: Energy possessed by an object due to its motion.
Q.12 What is the formula of kinetic energy?
Answer: (1/2) mv²
Q.13 What is potential energy?
Answer: Potential energy is the stored energy an object or system possesses due to its position, arrangement, or state
Q.14 What is gravitational potential energy?
Answer: Energy due to height above ground.
Q.15 Formula of potential energy?
Answer: mgh
Q.16 What is mechanical energy?
Answer: Sum of kinetic and potential energy.
Q.17 State law of conservation of energy.
Answer: Energy can neither be created nor destroyed, only transformed from one form to another.
Q.18 What is commercial unit of energy?
Answer: Kilowatt-hour (kWh)
Q.19 1 kWh is equal to?
Answer: 3.6 × 10⁶ Joules
Q.20 What is negative work?
Answer: Work done opposite to direction of force.
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Q.21 What is positive work?
Answer: Work done in direction of force.
Q.22 What is zero power?
Answer: When no work is done over time.
Q.23 Define 1 Joule.
Answer: Work done when 1 N (Newton) force moves an object 1 m (Meter).
Q.24 What is force?
Answer: A force is a push or pull acting on an object.
Q.25 What is SI unit of force?
Answer: Newton (N)
Q.26 What is 1 Horsepower (HP)?
Answer: 746 Watts (W)
Q.27 Which energy stored in a stretched spring?
Answer: Elastic potential energy
Q.28 What is unit of commercial electricity consumption?
Answer: kWh (kilowatt-hour)
Q.29 What type of energy is wind energy?
Answer: Kinetic energy
Q.30 What type of energy is solar energy?
Answer: Radiant energy
Q.31 What is heat energy?
Answer: Energy transferred due to temperature difference.
Q.32 What is chemical energy?
Answer: Energy stored in chemical bonds.
Q.33 What is electrical energy?
Answer: Energy from electric charges.
Q.34 What is nuclear energy?
Answer: Energy from atomic nucleus.
Q.35 What is sound energy?
Answer: Energy from vibrations producing sound.
Q.36 What is light energy?
Answer: The form of energy that is carried by light and enables us to see objects is called light energy.
Q.37 What is renewable energy?
Answer: Energy that we get naturally.
Q.38 Example of renewable energy?
Answer: Solar energy
Q.39 Define non-renewable energy.
Answer: Energy obtained from sources that cannot be replenished quickly and may get exhausted is called non-renewable energy.
Q.40 Give an example of non-renewable energy?
Answer: Coal, Oil, Natural gas etc.
Q.41 What is work-energy theorem?
Answer: The work done equals change in kinetic energy.
Q.42 What is a machine?
Answer: A device that makes work easier. Eg. Pulley
Q.43 What is input work?
Answer: The work done on a machine or system to make it operate is called input work.
Q.44 What is output work?
Answer: The work done by a machine as a result of input is called output work.
Q.45 What is the formula of ‘Power’?
Answer: Work/Time
Q.46 What is average power?
Answer: The total work done divided by the total time taken is called average power.
Q.47 What is instantaneous power?
Answer: The power at a particular instant of time is called instantaneous power.
Q.48 What is unit of energy in CGS system?
Answer: Erg
Q.49 1 Joule equals how many ergs?
Answer: 10⁷ Ergs
Q.50 What is potential energy at ground level?
Answer: Zero
Q.51 What happens to Kinetic Energy when speed doubles?
Answer: It increases by four times
Q.52 What happens to Kinetic Energy when mass doubles?
Answer: It doubles
Q.53 Define work done by gravity.
Answer: The work done by the gravitational force on an object when it moves under its influence is called work done by gravity.
Q.54 What is free fall?
Answer: The motion of an object when it falls only under the influence of gravity (no other forces acting) is called free fall.
Q.55 What is unit of momentum?
Answer: kg m/s
Q.56 What is the relation between work and energy?
Answer: Work transfers energy.
Q.57 What is stored energy?
Answer: Potential energy
Q.58 What is moving energy?
Answer: Kinetic energy
Q.59 What is elastic energy?
Answer: The energy stored in an object when it is stretched or compressed is called elastic energy.
Q.60 What is binding energy?
Answer: The energy required to separate the particles of a system (like a nucleus) completely is called binding energy.
Q.61 What is thermal energy?
Answer: The energy possessed by an object due to the motion of its particles (atoms or molecules) is called thermal energy.
Q.62 What is rate of energy transfer?
Answer: Power
Q.63 Define watt-hour?
Answer: The amount of energy used when a power of 1 watt is consumed for 1 hour is called one watt-hour.
Q.64 What is SI unit of pressure?
Answer: Pascal (Pa)
Q.65 What is energy transformation?
Answer: The process of changing energy from one form to another is called energy transformation.
Q.66 Give an example of energy transformation?
Answer: Electrical to light energy
Q.67 What is friction?
Answer: The force that opposes the motion or tendency of motion between two surfaces in contact is called friction.
Q.68 Work done by friction is?
Answer: Negative
Q.69 What is gravitational force?
Answer: The force of attraction between any two masses in the universe is called gravitational force.
Q.70 What is SI unit of mass?
Answer: Kilogram (Kg)
Q.71 What is speed?
Answer: Distance/time
Q.72 What is velocity?
Answer: The rate of change of displacement with respect to time is called velocity.
Q.73 What is acceleration?
Answer: The rate of change of velocity with respect to time is called acceleration.
Q.74 What is SI unit of acceleration?
Answer: m/s²
Q.75 Which energy is there in flowing water?
Answer: Kinetic energy
Q.76 What is hydroelectric energy?
Answer: The energy produced by using the flowing or falling water to generate electricity is called hydroelectric energy.
Q.77 What is windmill used for?
Answer: Windmill is used for converting wind energy to electricity
Q.78 What is turbine?
Answer: A machine that converts the energy of flowing fluids (like water, steam, or air) into mechanical energy is called a turbine.
Q.79 What is generator?
Answer: A device that converts mechanical energy into electrical energy is called a generator.
Q.80 What is battery?
Answer: A device that stores chemical energy and converts it into electrical energy is called a battery.
Q.81 What is fuel?
Answer: A substance that produces energy when it is burned or used in a reaction is called fuel.
Q.82 What is calorific value?
Answer: The amount of heat energy produced when a unit mass of fuel is completely burned is called calorific value.
Q.83 What is the Unit of calorific value?
Answer: Kilojoules per kilogram (kJ/kg)
Q.84 What is fossil fuel?
Answer: Fuels formed from the remains of ancient plants and animals over millions of years are called fossil fuels.
Q.85 Give an example of fossil fuel?
Answer: Petroleum
Q.86 What is biomass energy?
Answer: The energy obtained from organic materials like plants, animal waste, and agricultural residues is called biomass energy.
Q.87 What is solar panel?
Answer: A device that converts sunlight into electrical energy using solar cells is called a solar panel.
Q.88 What is geothermal energy?
Answer: The energy obtained from the heat inside the Earth is called geothermal energy.
Q.89 What is tidal energy?
Answer: The energy obtained from the rise and fall of sea tides is called tidal energy.
Q.90 What is lever?
Answer: A rigid bar that rotates around a fixed point to lift or move loads is called a lever.
Q.91 What is pulley?
Answer: A simple machine consisting of a wheel with a groove and a rope, used to lift or move loads, is called a pulley.
Q.92 What is inclined plane?
Answer: A sloping surface used to raise or lower objects with less effort is called an inclined plane.
Q.93 What is gear?
Answer: A rotating machine part with teeth that meshes with another gear to transmit motion and force is called a gear.
Q.94 What is energy crisis?
Answer: A situation in which the supply of energy is not enough to meet the demand, causing shortage of fuel and electricity, is called an energy crisis.
Q.95 What is conservation of energy?
Answer: The principle that energy cannot be created or destroyed but can only be changed from one form to another is called conservation of energy.
Q.96 What is power plant?
Answer: A place where energy from sources like coal, water, wind, or sunlight is converted into electricity is called a power plant.
Q.97 What is thermal power plant?
Answer: A power plant in which heat energy from burning fuels like coal is used to produce electricity is called a thermal power plant.
Q.98 What is nuclear power plant?
Answer: A power plant in which energy released from nuclear reactions is used to produce electricity is called a nuclear power plant.
Q.99 What is hydro power plant?
Answer: A power plant in which energy of flowing or falling water is used to generate electricity is called a hydro power plant
Q.100 What is unit of electricity bill?
Answer: kWh
Q.101 What is energy meter?
Answer: Energy meter is a device that measures and records the total electrical energy consumed.
Q.102 What is unit of frequency?
Answer: Hertz (Hz)
Q.103 What is voltage?
Answer: Voltage is an electric potential difference.
Q.104 What is current?
Answer: Electric current is the rate at which electric charge flows through conductor.
Q.105 What is Ohm’s Law formula?
Answer: V = IR
Conclusion:
In conclusion, Work, Power, and Energy are essential concepts that help us understand how physical processes occur in our daily lives. They explain how forces cause motion, how energy is transferred or transformed, and how quickly tasks are performed. From simple activities like lifting objects to complex operations in machines, these principles play a vital role. Thus, mastering Work, Power, and Energy is important for both academic success and practical knowledge.
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