10th Physics Chapter 6: Electromagnetism
| Sr # | Questions | A | B | C | D |
|---|---|---|---|---|---|
| 1 | What is mutual induction? | The induction of an electromotive force in a circuit by the changing magnetic flux produced by a nearby circuit | The induction of an electric field in a conductor due to its motion through a magnetic field | The production of a magnetic field due to the flow of electric current in a conductor | The production of an electric field due to the presence of nearby charges | 2 | A step-down transformer is commonly used in: | Power distribution networks | Electrical substations | High-voltage transmission lines | Electronic devices | 3 | Which of the following factors does not affect the magnitude of the induced emf in a coil of an AC generator? | Speed of rotation | Number of turns in the coil | Strength of the magnetic field | Length of the conductor | 4 | What component of an AC generator is responsible for generating a changing magnetic field? | Armature | Commutator | Stator | Rotor | 5 | When a current-carrying wire is placed perpendicular to a magnetic field, the force experienced by the wire is: | Maximum | Minimum | Zero | Indeterminate | 6 | Which of the following statements about transformers is true? | Transformers work only with DC voltage sources | Transformers can only increase voltage, not decrease it | Transformers are based on the principle of self-induction | Transformers can change the voltage level of an AC voltage source | 7 | Which law governs the force experienced by a current-carrying conductor in a magnetic field? | Ohm's law | Faraday's law | Ampere's law | Lorentz force law | 8 | Electromagnetic induction is the process of: | Generating electricity from chemical reactions | Generating a magnetic field from an electric current | Generating an electric current by changing magnetic flux | Generating heat from electric current | 9 | What is the secondary coil of a transformer connected to? | A load | A power source | A capacitor | A resistor | 10 | What happens to the current in the secondary coil of a transformer compared to the primary coil when the voltage is stepped up? | The current increases | The current decreases | The current remains the same | The current becomes zero | 11 | Mutual induction is the principle behind the operation of which device? | Generator | Motor | Transformer | Resistor | 12 | What is the basic principle behind the operation of a transformer? | Faraday's law of electromagnetic induction | Ohm's law | Newton's second law of motion | Hooke's law of elasticity |