AP EAPCET (Engineering) Magnetism and Matter — practice questions
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Practice AP EAPCET (Engineering) Magnetism and Matter in the app →Newton's FIRST law is also called the law of:Newton's SECOND law states:The SI unit of force is the:Frictional force between surfaces ALWAYS acts:Static friction f_s satisfies:Kinetic friction f_k is given by:For a body on a horizontal surface, the NORMAL FORCE N equals:In circular motion at radius r and speed v, the centripetal acceleration is:The ANGLE OF REPOSE φ is related to coefficient of friction by:A 5 kg object experiences a net force of 20 N. Find its acceleration:A 10 kg block on rough horizontal surface with μ_s = 0.3 just starts moving. Force applied:A block of mass 2 kg on a smooth incline at 30°. Acceleration down the incline (g = 10):A 1500 kg car accelerates from 0 to 30 m/s in 10 s. Average force on car:In a tug-of-war, team A pulls with 200 N, team B pulls oppositely with 250 N. The rope (light) experiences netA block of mass 5 kg on a rough incline at 37° with μ_k = 0.4. Acceleration down (g = 10, sin 37° = 0.6, cos 3For a body on a 60° incline with μ = 0.5, the body:An object's WEIGHT on Earth (g = 10) is 50 N. Its MASS is:A 5 kg block is pushed with 30 N along a frictionless surface. Acceleration:A massless pulley system has two blocks: m₁ = 6 kg and m₂ = 4 kg hanging on either side. Find acceleration of The angle of repose between a block and an incline is 30°. The coefficient of static friction is:A 100 g object is moving in a vertical circle. At the TOP of the loop, for minimum speed (string just slack), Limiting (max static) friction is INDEPENDENT of:A 4 kg mass hangs from a spring scale in an elevator. Spring reads 32 N. The elevator is:A 3 kg block is pulled with F = 20 N at 30° above horizontal on rough surface (μ_k = 0.4). Find acceleration (In a uniform circular motion, the SPEED is constant but velocity changes direction. The acceleration:A car turns a corner of radius 50 m at 20 m/s. Minimum coefficient of friction needed (g = 10):A 50 kg person stands on a scale in an elevator accelerating UP at 2 m/s². Scale reading:Two equal masses (3 kg each) connected by a light string over a frictionless pulley. One on smooth horizontal A pendulum of mass m swings to amplitude angle θ. At the lowest point of swing, the TENSION in the string equaA car of mass 1000 kg moving at 36 km/h is stopped by brakes in 5 seconds. Average force exerted by brakes:Newton's first law of motion is also known as the law ofA cricket ball of mass 150 g moving at (3i+4j) m/s is hit to -(3i+4j) m/s. The magnitude of momentum change isConservation of linear momentum in a collision follows directly fromA force F acts on a 2 kg body for 3 s, changing its speed from 2 m/s to 8 m/s along the line of F. The magnituThe maximum static friction force on a body is f = μN. Static friction is best described asA 10 kg block on a frictionless surface is pulled by 20 N horizontally and 20 N at 60° above horizontal. The hImpulse equalsA body in equilibrium under several forces hasA 0.5 kg ball hits a wall at 10 m/s and rebounds at 10 m/s. The impulse on the ball isNewton's second law in vector form isA lift accelerates upward at 2 m/s². The apparent weight of a 50 kg person (g=10) isTwo blocks of 2 kg and 3 kg connected by a string are pulled by 10 N on the 3 kg block (frictionless). The accThe SI unit of force, the newton, equalsA passenger standing in a bus is thrown backward when the bus suddenly starts moving forward. This is best expOne newton is defined as the force that gives a mass of 1 kg an acceleration of:The linear momentum of a body is defined as the product of its:The impulse of a force has the same dimensions as:The action and reaction forces of Newton's third law:For a given pair of surfaces, the coefficient of kinetic friction is usually:A constant force of 20 N acts on a 5 kg body initially at rest. Its speed after 3 s is:A 0.15 kg ball moving at 12 m s⁻¹ is hit straight back along its path with the same speed. The magnitude of thA 0.04 kg bullet moving at 90 m s⁻¹ is stopped after penetrating 0.6 m into a block. The average resistive forA block just begins to slide down an incline when the angle of inclination is 30°. The coefficient of static fA 0.02 kg bullet is fired with a speed of 300 m s⁻¹ from a 4 kg gun. The recoil speed of the gun is:A 50 kg person stands on a weighing scale inside a lift accelerating upward at 2 m s⁻² (g = 10 m s⁻²). The scaA 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tenThe maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs =For a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tensioA net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4A block slides down a rough incline of 30° with coefficient of kinetic friction 0.2 (g = 10 m s⁻²). Its acceleA lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside isA 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse iThe optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g The word magnet comes from the name of an island in which country?What are isolated north or south magnetic poles called?A bar magnet is cut into two halves. What results?Why can two magnetic field lines never intersect?Where field lines are crowded together, what can be said of the magnetic field?The far axial field of a short bar magnet varies with distance r as:A magnetic needle of moment m makes angle theta with field B. What is the torque on it?At what angle between m and B is a dipole in stable equilibrium?What is the maximum magnetic potential energy of a dipole m in a field B?With zero integration constant, U = 0 at which needle orientation?In the analogy of electric and magnetic dipoles, the electric dipole moment p corresponds to:For a short bar magnet, how does the axial field compare with the equatorial field at the same large distance?If monopoles existed, the closed-surface flux of B would equal:Why is it misleading to call magnetic field lines lines of force?Magnetisation M of a sample is defined as its:In what unit is magnetic intensity H measured?Which relation connects B, H and M inside a magnetic material?The magnetic susceptibility of a material is:A material has susceptibility 4 x 10^-4. What is its relative permeability?Which sign and size of susceptibility does a diamagnetic material have?The relative permeability is the magnetic analog of which electrostatic quantity?A solenoid core has relative permeability 200 and H = 2000 A/m. What is B in the core?A core of relative permeability 400 sits in a field with H = 2000 A/m. Its magnetisation is about:Which kind of material has a large positive susceptibility?A paramagnetic substance has relative permeability that is:In a non-uniform field, diamagnetic substances tend to move:Which of these substances is diamagnetic?Diamagnetism is found in:Atoms of a diamagnetic substance have a resultant magnetic moment that is:Which law explains why electrons slow down or speed up in diamagnetism?The typical reduction of field inside a diamagnetic bar is about one part in:Magnetisation of a paramagnet increases when the temperature is:Saturation of a paramagnetic sample means:Roughly how many atoms does a typical ferromagnetic domain contain?Which one is a hard ferromagnetic alloy used for permanent magnets?Which material loses its magnetisation when the external field is removed?The relative permeability of a ferromagnetic material is typically:When an external field acts on a ferromagnet, domains aligned with the field:Along a bar magnet, where is the magnetic field intensity strongest?Which source of magnetic field has no north or south pole?Ampere's hypothesis explains all magnetic phenomena through:The link between moving charges and magnetic fields was discovered in the:Perfect diamagnetism shown by superconductors is called theA perfect diamagnet such as a superconductor has relative permeability equal toOxygen gas at STP is classified asThe susceptibility of a diamagnetic substance isFor a ferromagnetic material, the relative permeability isA diamagnetic rod in a non-uniform field tends to moveDiamagnetism in an atom is explained by the induced current obeyingIn a paramagnet, random thermal motion of atoms causesAtoms in a ferromagnet align spontaneously inside regions calledAbove a high enough temperature, a ferromagnet behaves like aA soft ferromagnetic material loses its magnetisation whenWhich element is ferromagnetic at room temperature?Isolated magnetic north or south poles are calledA magnet of moment 2 A m² lies perpendicular to a 0.5 T field. The torque on it isA dipole of moment 3 A m² is aligned along a 0.2 T field. Its potential energy is