Magnetism Homework 4th Jan PDF

Magnetism and Magnetic Materials MCQ Quiz 1. Which material is most suitable for making a permanent magnet? a) Iron b) Steel c) Copper d) Aluminum 2. What happens when like poles of two magnets are brought close to each other? a) They attract b) They repel c) They cancel out d) No effect 3. W...

Magnetism and Magnetic Materials MCQ Quiz 1. Which material is most suitable for making a permanent magnet? a) Iron b) Steel c) Copper d) Aluminum 2. What happens when like poles of two magnets are brought close to each other? a) They attract b) They repel c) They cancel out d) No effect 3. Which of the following is a non-magnetic material? a) Nickel b) Glass c) Cobalt d) Iron 4. The strength of a magnetic field is strongest at: a) The poles of the magnet b) The center of the magnet c) Equidistant points on the magnet d) Outside the magnetic field 5. Which property of magnetic materials allows them to retain magnetism? a) Hardness b) Retentivity c) Permeability d) Conductivity 6. Magnetic poles always exist: a) In pairs b) Individually c) Only when magnetized d) On the surface of a magnet 7. A magnetic compass is based on the principle that: a) Earth has a magnetic field b) A bar magnet creates heat c) Light bends in magnetic fields d) Magnets lose polarity over time 8. The Earth's magnetic north pole corresponds to: a) Geographic north pole b) Geographic south pole c) Magnetic south pole d) None of the above 9. Which of the following materials is used for making temporary magnets? a) Soft iron b) Stainless steel c) Copper d) Glass 10. What does the direction of a magnetic field line indicate? a) The force between charges b) The path of a moving charge c) The direction of the magnetic force d) The direction of a compass needle 11. What shape do the field lines around a bar magnet form? a) Concentric circles b) Straight lines c) Ellipses d) Closed loops 12. Magnetic field lines: a) Cross each other b) Are open loops c) Do not intersect d) Are parallel in all magnets 13. The uniform magnetic field can be represented by: a) Parallel straight lines b) Converging lines c) Diverging lines d) Circular lines 14. Which instrument uses a freely suspended magnetic needle? a) Electric bell b) Compass c) Solenoid d) Electromagnet 15. What happens when a bar magnet is cut into two pieces? a) Each piece becomes a new magnet with two poles b) Magnetism disappears c) Each piece has one pole only d) Magnetic strength doubles 16. Magnetic field lines around a straight current-carrying conductor are: a) Straight lines b) Circular c) Parabolic d) Elliptical 17. A compass needle placed in a magnetic field: a) Aligns itself parallel to the field b) Aligns itself perpendicular to the field c) Shows random directions d) Does not move 18. Earth's magnetic field is believed to be generated by: a) The Earth's core motion b) Solar radiation c) Gravitation d) Ocean currents 19. A solenoid is used to create: a) Heat b) Light c) Uniform magnetic field d) Electric current 20. Electromagnets are made by: a) Winding a wire around a soft iron core b) Using permanent magnets c) Using steel cores d) Wrapping plastic wires around iron 21. Which device demonstrates the working of an electromagnet? a) Compass b) Electric bell c) Barometer d) Thermometer 22. The magnetic strength of an electromagnet can be increased by: a) Increasing current b) Decreasing current c) Using glass core d) Decreasing coil turns 23. The core of an electromagnet is usually made of: a) Steel b) Soft iron c) Aluminum d) Copper 24. The purpose of a solenoid in an electric bell is to: a) Create sound b) Attract and release the hammer c) Control voltage d) Generate current 25. A temporary magnet retains its magnetism for: a) A very long time b) Only when current flows c) Even without current d) Indefinitely 26. Permanent magnets are made using: a) Soft iron b) Hardened steel c) Pure copper d) Lead 27. The direction of the magnetic field around a current-carrying wire is given by: a) Right-hand thumb rule b) Fleming's left-hand rule c) Newton's law d) Ohm's law 28. The polarity of an electromagnet depends on: a) The direction of current flow b) The material of the core c) The length of the wire d) The type of power source 29. The armature of an electric bell is attracted to the: a) Electromagnet b) Solenoid c) Permanent magnet d) Battery 30. What happens to the magnetic field inside a solenoid when the number of turns is increased? a) Increases b) Decreases c) Becomes zero d) No change 31. In a solenoid, the magnetic field lines are: a) Parallel inside the coil b) Circular outside the coil c) Both a and b d) Random  Answers 1: b 2: b 3: b 4: a 5: b 6: a 7: a 8: c 9: a 10: d 11: d 12: c 13: a 14: b 15: a 16: b 17: a 18: a 19: c 20: a 21: b 22: a 23: b 24: b 25: b 26: b 27: a 28: a 29: a 30: a 31: c