Magnets and Magnetic Fields(Form 5, physics)Versión en línea Test your knowledge on the stroking method of making magnets! por YAKILI LMS 1 What material is commonly magnetised using the stroking method? a Plastic b Iron c Aluminum d Copper 2 What tool is typically used in the stroking method? a A screwdriver b A magnet c A hammer d A wrench 3 In the stroking method, how is the magnet applied to the material? a Rubbed in circles b Tapped lightly c Stroked in one direction d Shaken vigorously 4 What happens to the material during the stroking method? a It becomes magnetized b It melts c It loses weight d It hardens 5 How many strokes are typically needed to magnetize an object? a Multiple strokes b One stroke c A hundred strokes d Ten strokes 6 What is the main principle behind the stroking method? a Cooling the material b Heating the material c Aligning magnetic domains d Applying pressure 7 Can the stroking method be used on all metals? a Only on soft metals b No, only ferromagnetic materials c Yes, all metals d Yes, all non-metals 8 What is a common application of magnetized objects? a Insulating heat b Filtering air c Conducting electricity d Holding items together 9 What is the effect of stroking a magnet in the opposite direction? a It strengthens the magnetism b It has no effect c It can demagnetize the object d It changes the color 10 What is the primary method discussed for magnetization? a Electrical method b Chemical method c Thermal method d Mechanical method 11 Which material is commonly used in the electrical magnetization process? a Diamagnetic materials b Ferromagnetic materials c Non-magnetic materials d Superconductors 12 What is the role of electric current in magnetization? a It cools the material b It strengthens the material c It generates a magnetic field d It demagnetizes the material 13 What happens to the magnetic domains during electrical magnetization? a They disappear completely b They scatter randomly c They align in the direction of the magnetic field d They become non-magnetic 14 What is a common application of electrically magnetized materials? a Glassware b Wooden furniture c Plastic toys d Electromagnets 15 What is required to demagnetize a magnetized object? a Applying a strong magnetic field b Submerging in water c Reversing the electric current d Heating it above Curie temperature 16 What type of current is often used in electrical magnetization? a Pulsed current b Alternating current (AC) c Direct current (DC) d Static current 17 What is the effect of increasing the electric current on magnetization? a Demagnetizes the material b Has no effect c Decreases the magnetic field d Increases the strength of the magnetic field 18 What is the term for the process of making a material magnetic? a Magnetization b Magnetoformation c Magnetization d Magnetopathy 19 What is a key factor in the efficiency of the electrical magnetization process? a Shape of the material b Material properties c Color of the material d Size of the material 20 What is demagnetisation? a Making a material radioactive. b Increasing a material's magnetism. c The process of removing magnetic properties from a material. d Adding magnetic properties to a material. 21 Which of the following is a common method of demagnetisation? a Cooling the material to absolute zero. b Submerging in liquid nitrogen. c Heating the material above its Curie temperature. d Applying a strong magnetic field. 22 What is the Curie temperature? a The temperature at which a ferromagnetic material loses its magnetism. b The temperature of absolute zero. c The temperature at which metals melt. d The temperature at which magnets are created. 23 Which of the following materials can be demagnetised? a Non-magnetic metals. b Ferromagnetic materials. c Superconductors. d Diamagnetic materials. 24 What effect does mechanical shock have on magnets? a It makes the magnet glow. b It strengthens the magnet. c It can lead to partial demagnetisation. d It has no effect. 25 What is one application of demagnetisation? a Enhancing electrical conductivity. b Creating stronger magnets. c Increasing thermal resistance. d Resetting magnetic storage devices. 26 What is the purpose of a demagnetiser device? a To remove unwanted magnetism from objects b To measure magnetic fields. c To amplify magnetism. d To create new magnets. 27 Which of the following is NOT a method of demagnetisation? a Using heat. b Using mechanical vibration. c Using alternating current. d Using a permanent magnet. 28 What happens to the magnetic domains during demagnetisation? a They align perfectly. b They become disordered. c They double in number. d They disappear completely. 29 Why is demagnetisation important in electronics? a It enhances signal strength. b It reduces device size. c It increases power consumption. d It prevents data loss in magnetic storage media. 30 What is the primary magnetic property of iron? a Paramagnetism b Ferromagnetism c Diamagnetism d Superconductivity 31 How does steel’s magnetic property differ from pure iron? a Steel is more magnetic than iron. b Steel has no magnetic properties. c Steel is only diamagnetic. d Steel is less magnetic than iron 32 What element is commonly added to steel to enhance its properties? a Aluminum b Lead c Copper d Carbon 33 Which type of steel is known for its magnetic properties? a Alloy steel b Low-carbon steel c Stainless steel d High-carbon steel 34 What happens to iron’s magnetism when heated above the Curie temperature? a It loses its magnetism. b It gains more magnetism. c It becomes superconductive. d It remains unchanged. 35 What is the Curie temperature for iron? a 1000°C b 900°C c Approximately 770°C d 500°C 36 Which material is typically more resistant to demagnetization? a Steel b Copper c Aluminum d Iron 37 What is the effect of alloying elements on steel's magnetism? a They make it superconductive. b They enhance its magnetism. c They can reduce its magnetic properties. d They have no effect. 38 What is the magnetic saturation point of iron compared to steel? a They are the same. b Neither has a saturation point. c Iron has a higher saturation point. d Steel has a higher saturation point. 39 Which type of magnetism is exhibited by steel? a Paramagnetism b Ferromagnetism c Diamagnetism d Antiferromagnetism 40 What do magnetic poles always exist as? a In pairs b In clusters c Individually d In groups of three 41 What are the two types of magnetic poles? a North and South b East and West c Alpha and Omega d Positive and Negative 42 What happens when two like magnetic poles are brought together? a They repel each other b They disappear c They neutralize d They attract each other 43 What is the result of breaking a magnet in half? a Two new magnets with both poles b No magnets at all c One magnet with no poles d One magnet with only one pole 44 Which pole of a magnet is attracted to the Earth’s North Pole? a West pole b East pole c South pole d North pole 45 What is the magnetic field around a magnet? a A gravitational field b A vacuum c An electric field d A region of magnetic influence 46 What do you call the area around a magnet where magnetic forces are felt? a Magnetic shell b Magnetic layer c Magnetic zone d Magnetic field 47 What happens to magnetic poles when a magnet is heated? a They become stronger b They can lose their magnetism c They disappear d They change polarity 48 What is the term for the force that causes magnets to attract or repel? a Electromagnetism b Magnetism c Friction d Gravity 49 What is the primary reason magnetic poles exist in pairs? a To balance forces b To attract metals c To create electricity d Conservation of magnetic field lines
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