NPCIL Trainee Magnetism — practice questions
16 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NPCIL Trainee Magnetism in the app →The pole of a freely suspended magnet that orients toward geographic north is called its:What happens when the north poles of two different bar magnets are brought close together?If a bar magnet is cut in half, what do the two resulting pieces have?The Curie temperature of a ferromagnetic material is best described as the temperature:What is the approximate Curie temperature of iron?In an unmagnetized piece of iron, how are the microscopic magnetic domains arranged?A device that converts mechanical energy into electrical energy is called a:What does an electric motor do?In a transformer, the coil across which the input voltage is applied is called the:A step-up transformer must increase the voltage fivefold. What must be the ratio of secondary coil turns to prStep-up transformers are used before long-distance electrical power transmission mainly to:The power lost as heat in a transmission wire, due to its resistance, is proportional to:In 1831, which two scientists independently demonstrated that a changing magnetic field can produce an electriIn Faraday's classic experiment of moving a bar magnet through a wire coil, when is a current actually inducedIn the United States, household alternating current has a frequency of 60 Hz. At what frequency does a light bA US household light bulb on AC power actually flickers at 120 Hz, yet people never notice this flickering in