## Physics GK for Competitive Exams

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### Here Are Some Physics GK for Competitive Exams Along With Answers-

**What is the unit of electric current?**Answer: Ampere. Explanation: Ampere is the unit of electric current in the International System of Units (SI).**Who discovered the electron?**Answer: J.J. Thomson. Explanation: J.J. Thomson discovered the electron in 1897.**What is the speed of light in a vacuum?**Answer: 299,792,458 meters per second. Explanation: The speed of light in a vacuum is constant and is approximately 299,792,458 meters per second.**What is the SI unit of force?**Answer: Newton. Explanation: The SI unit of force is Newton, named after Sir Isaac Newton.**What is the formula for calculating kinetic energy?**Answer: KE = 1/2mv^2. Explanation: The formula for calculating kinetic energy is KE = 1/2mv^2, where m is the mass of the object and v is its velocity.**What is the name of the force that opposes motion between two surfaces in contact?**Answer: Friction. Explanation: Friction is the force that opposes motion between two surfaces in contact.**What is the formula for calculating acceleration?**Answer: a = (v2 – v1) / t. Explanation: The formula for calculating acceleration is a = (v2 – v1) / t, where v2 is the final velocity, v1 is the initial velocity, and t is the time taken.**What is the name of the law that states that for every action, there is an equal and opposite reaction?**Answer: Newton’s third law of motion. Explanation: Newton’s third law of motion states that for every action, there is an equal and opposite reaction.**What is the formula for calculating work?**Answer: W = Fd. Explanation: The formula for calculating work is W = Fd, where F is the force applied and d is the distance over which the force is applied.**What is the SI unit of power?**Answer: Watt. Explanation: The SI unit of power is Watt, named after James Watt.**What is the name of the force that holds atoms and molecules together?**Answer: Chemical bonding force. Explanation: The chemical bonding force holds atoms and molecules together.**What is the formula for calculating potential energy?**Answer: PE = mgh. Explanation: The formula for calculating potential energy is PE = mgh, where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above a reference point.**What is the name of the law that states that the total energy in a closed system is constant?**Answer: The law of conservation of energy. Explanation: The law of conservation of energy states that the total energy in a closed system is constant.**What is the name of the force that holds the nucleus of an atom together?**Answer: Strong nuclear force. Explanation: The strong nuclear force holds the nucleus of an atom together.**What is the formula for calculating density?**Answer: Density = mass / volume. Explanation: The formula for calculating density is Density = mass / volume, where mass is the amount of matter in an object and volume is the amount of space it occupies.**What is the name of the law that states that the pressure and volume of a gas are inversely proportional to each other at a constant temperature?**Answer: Boyle’s law. Explanation: Boyle’s law states that the pressure and volume of a gas are inversely proportional to each other at a constant temperature.**What is the formula for calculating pressure?**Answer: Pressure = force / area. Explanation: The formula for calculating pressure is Pressure = force / area, where force is the amount of perpendicular force applied and area is the surface area over which the force is distributed. Pressure is the measure of the force exerted per unit area.

**What is the name of the force that is responsible for keeping planets in orbit around the sun?**Answer: Gravitational force. Explanation: The gravitational force is responsible for keeping planets in orbit around the sun.**What is the formula for calculating power?**Answer: Power = work / time. Explanation: The formula for calculating power is Power = work / time, where work is the amount of energy transferred and time is the duration over which the transfer takes place.**What is the name of the law that states that the amount of heat added to a system is equal to the increase in its internal energy plus the work done on the system?**Answer: The first law of thermodynamics. Explanation: The first law of thermodynamics states that the amount of heat added to a system is equal to the increase in its internal energy plus the work done on the system.**What is the formula for calculating electric power?**Answer: Electric power = current x voltage. Explanation: The formula for calculating electric power is Electric power = current x voltage, where current is the flow of electric charge and voltage is the electric potential difference between two points.**What is the name of the law that states that the entropy of a closed system tends to increase over time?**Answer: The second law of thermodynamics. Explanation: The second law of thermodynamics states that the entropy of a closed system tends to increase over time.**What is the formula for calculating torque?**Answer: Torque = force x distance. Explanation: The formula for calculating torque is Torque = force x distance, where force is the perpendicular force applied and distance is the distance between the point of application and the axis of rotation.**What is the name of the law that states that the resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area?**Answer: The Ohm’s law. Explanation: The Ohm’s law states that the resistance of a conductor is directly proportional to its length and inversely proportional to its cross-sectional area.**What is the formula for calculating electric potential energy?**Answer: Electric potential energy = qV. Explanation: The formula for calculating electric potential energy is Electric potential energy = qV, where q is the electric charge and V is the electric potential difference between two points.**What is the name of the force that opposes the motion of an object through a fluid?**Answer: Drag force. Explanation: The drag force opposes the motion of an object through a fluid.**What is the formula for calculating electric resistance?**Answer: Electric resistance = voltage / current. Explanation: The formula for calculating electric resistance is Electric resistance = voltage / current, where voltage is the electric potential difference and current is the flow of electric charge.**What is the name of the phenomenon where the frequency of a wave appears to change due to the motion of the observer or the source?**Answer: The Doppler effect. Explanation: The Doppler effect is the phenomenon where the frequency of a wave appears to change due to the motion of the observer or the source.**What is the formula for calculating angular velocity?**Answer: Angular velocity = angular displacement / time. Explanation: The formula for calculating angular velocity is Angular velocity = angular displacement / time, where angular displacement is the change in the angle over time.**What is the name of the force that opposes the motion of an object in a fluid due to its weight?**Answer: Buoyancy force. Explanation: The buoyancy force opposes the motion of an object in a fluid due to its weight.

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