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Q1. The naturally occurring magnetic stone is called:
Loadstone is a naturally occurring magnetic mineral that was discovered by ancient people. It is actually a type of iron ore called magnetite, which has natural magnetic properties. The word “loadstone” means “leading stone” because it was used by early sailors to find directions.
Q2. A loadstone is a natural magnet made of:
Loadstone is a naturally occurring mineral composed of iron oxide, specifically magnetite. It is called a natural magnet because it has the ability to attract small pieces of iron without any human intervention. This property was discovered thousands of years ago and led to the invention of the magnetic compass.
Q3. The instrument used to find directions is called a:
A magnetic compass is a simple instrument that helps us find directions. It consists of a small magnetic needle that is free to rotate on a pivot, and it always points towards the Earth’s North and South poles. This instrument is very useful for sailors, travellers and explorers to navigate their way.
Q4. The magnetic compass always points towards the:
A magnetic compass always aligns itself in the North-South direction because of the Earth’s magnetic field. The Earth acts like a giant magnet with its magnetic poles near the geographic North and South poles. The needle of the compass points towards the magnetic north pole.
Q5. Materials that are attracted to magnets are called:
Magnetic materials are substances that are attracted to a magnet. These materials contain iron, nickel or cobalt, which are naturally magnetic. Common examples include iron nails, steel objects, nickel coins and cobalt alloys.
Q6. Which of the following is a magnetic material?
Iron is a magnetic material because it is attracted to magnets. The atoms inside iron can align themselves in a way that responds to magnetic fields. This property makes iron the most commonly used material in making magnets and magnetic devices.
Q7. Materials that are not attracted to magnets are called:
Non-magnetic materials are substances that are not attracted to magnets because they do not contain iron, nickel or cobalt. These materials have no magnetic properties and cannot be magnetized. Examples include wood, plastic, glass, rubber and aluminium.
Q8. Which of the following is a non-magnetic material?
Wood is a non-magnetic material because it does not contain any magnetic elements like iron, nickel or cobalt. Magnets cannot attract wood, which is why wooden objects are not affected by magnetic fields. This makes wood useful for making non-magnetic parts in electronic devices.
Q9. The ends of a magnet where the magnetic force is strongest are called:
Every magnet has two ends where its magnetic force is the strongest, and these ends are called poles. One end is called the North pole and the other is called the South pole. The magnetic force is maximum at the poles and decreases towards the centre of the magnet.
Q10. The pole of a magnet that points towards the North is called the:
The pole of a freely suspended magnet that points towards the Earth’s geographic North is called the North pole. This is because the Earth’s magnetic South pole is actually located near the geographic North pole, attracting the magnet’s North pole. The North pole of a magnet is usually marked with the letter ‘N’.
Q11. The pole of a magnet that points towards the South is called the:
The pole of a freely suspended magnet that points towards the Earth’s geographic South is called the South pole. This happens because the Earth’s magnetic North pole is located near the geographic South pole, attracting the magnet’s South pole. The South pole is usually marked with the letter ‘S’.
Q12. Like poles of two magnets:
Like poles of two magnets, such as North-North or South-South, always repel each other. This means they push each other away because their magnetic fields oppose each other. This is a fundamental rule of magnetism: “like poles repel, unlike poles attract.”
Q13. Unlike poles of two magnets:
Unlike poles of two magnets, such as North-South, always attract each other. This means they pull towards each other because their magnetic fields complement each other. This attraction is the reason why magnets stick together when their opposite poles are brought close.
Q14. The rule of magnetism states that:
The basic rule of magnetism is that like poles (North-North or South-South) repel each other, while unlike poles (North-South) attract each other. This rule applies to all magnets, whether they are natural or artificial. Understanding this rule helps us understand how magnets interact with each other.
Q15. The force exerted by a magnet is called:
Magnetic force is the force exerted by a magnet that can attract or repel other magnetic materials. This force acts even when the magnet is not touching the object, which is why it is called a non-contact force. The magnetic force is strongest at the poles and weaker in the middle.
Q16. A magnet that is shaped like a rectangle or a straight bar is called a:
A bar magnet is a magnet that is shaped like a straight rectangular bar, with the North and South poles at its two ends. It is the simplest and most common shape of artificial magnets and is used in many experiments to study magnetism. Bar magnets are made from iron, steel or other magnetic materials.
Q17. A magnet shaped like the letter ‘U’ is called a:
A horseshoe magnet is shaped like the letter ‘U’ or like a horseshoe, which is why it gets its name. This shape brings the two poles close together, making the magnetic field stronger and the magnet more powerful. Horseshoe magnets are commonly used in schools and laboratories for demonstrations.
Q18. A horseshoe magnet is also called a:
A horseshoe magnet is also called a U-shaped magnet because it resembles the shape of the letter ‘U’. The two arms of the magnet have opposite poles close to each other, which increases the magnetic force. This design makes U-shaped magnets very strong and useful for lifting heavy iron objects.
Q19. A magnet that is shaped like a closed loop is called a:
A ring magnet is a circular magnet with a hole in the centre, shaped like a donut or a ring. Its poles are on the opposite faces of the ring, and the magnetic field flows in a unique pattern around it. Ring magnets are used in various applications like speakers, sensors and magnetic holders.
Q20. A magnet shaped like a circular disc with a hole is called a:
A ring magnet is a flat, circular magnet with a central hole, similar in shape to a washer or a donut. These magnets are often magnetized through their thickness, with one face being the North pole and the other the South pole. Ring magnets are used in many devices like motors, generators and magnetic couplers.
Q21. The magnetic compass was first used by sailors to:
Sailors were the first to use the magnetic compass to navigate the seas. By knowing which direction was North, they could determine their heading and travel safely across oceans. The compass was one of the most important inventions in history because it made long-distance sea travel possible.
Q22. The discovery of the magnetic compass made it possible for sailors to:
Before the compass was invented, sailors navigated by looking at the Sun and the stars, which was impossible on cloudy days or nights. The magnetic compass gave them a reliable way to find directions regardless of the weather. This invention revolutionized sea travel and trade around the world.
Q23. The region around a magnet where its magnetic force can be felt is called a:
A magnetic field is the invisible region around a magnet where its magnetic force acts on other magnetic objects. It is strongest near the poles and becomes weaker as we move away from the magnet. Iron filings sprinkled around a magnet can show the pattern of its magnetic field.
Q24. The magnetic field of a magnet is strongest at the:
The magnetic field of a magnet is strongest at its poles because the magnetic force is concentrated there. The field lines emerge from the North pole and enter at the South pole, forming closed loops. This is why magnetic objects are most strongly attracted to the ends of a magnet.
Q25. A freely suspended bar magnet always aligns itself in the:
When a bar magnet is freely suspended, it rotates until it aligns itself in the North-South direction. This happens because the Earth itself behaves like a giant magnet, with its magnetic poles near the geographic poles. The magnet’s North pole points towards the Earth’s geographic North.
Q26. The Earth acts like a giant magnet because:
The Earth acts like a giant magnet because its core contains molten iron and nickel, which generate electric currents and create a magnetic field. This magnetic field extends far into space and forms the magnetosphere. This is why a magnetic compass works on Earth.
Q27. The Earth’s magnetic North pole is located near the Earth’s geographic:
The Earth’s magnetic North pole is actually located near the geographic South pole. This is because the North pole of a compass needle is attracted to the Earth’s magnetic North pole, which is actually a magnetic South pole. This is why the north-seeking pole of a compass points towards the geographic North.
Q28. The Earth’s magnetic South pole is located near the Earth’s geographic:
The Earth’s magnetic South pole is located near the geographic North pole. This is confusing but important: the Earth’s magnetic South pole is attracted to the South pole of a magnet. This is why the south-seeking pole of a compass points towards the geographic South pole.
Q29. A magnet can attract a magnetic material even when:
The magnetic force can act through many materials, including air, paper, plastic and even thin sheets of wood. This is because the magnetic field is a non-contact force that penetrates these materials. This property is used in many applications, such as holding notes on a refrigerator door through paper.
Q30. The magnetic force can pass through:
Magnetic force can pass through non-magnetic materials like paper, plastic, wood and glass. This happens because these materials do not block or absorb magnetic fields. This property is very useful in everyday life, such as when a magnet sticks to a refrigerator through a piece of paper.
Q31. A magnetic compass consists of a small:
A magnetic compass contains a small, lightweight magnetic needle that is mounted on a sharp pivot so it can rotate freely. This needle is a thin magnet with its North and South poles marked. The needle aligns itself with the Earth’s magnetic field to show directions.
Q32. The needle of a magnetic compass is made of:
The needle of a magnetic compass is made of a magnetic material like steel, which is magnetized to become a small magnet. This allows the needle to respond to the Earth’s magnetic field and point towards the North. The needle is usually painted with colours to indicate its poles.
Q33. If the North pole of a magnet is brought near the North pole of another magnet, they will:
When the North pole of one magnet is brought near the North pole of another magnet, they will push each other away or repel. This is because like poles (North-North) have magnetic fields that oppose each other. The repulsion is a result of the magnetic field lines trying to avoid each other.
Q34. If the North pole of a magnet is brought near the South pole of another magnet, they will:
When the North pole of one magnet is brought near the South pole of another magnet, they will pull towards each other or attract. This is because opposite poles (North-South) have magnetic fields that complement each other. The attraction is the strongest when the poles are close together.
Q35. A magnet always has:
Every magnet, regardless of its shape, always has two poles—a North pole and a South pole. It is impossible to have a magnet with only one pole, as magnetic poles always exist in pairs. If you break a magnet in half, each piece will become a new magnet with its own North and South poles.
Q36. If a bar magnet is cut into two equal halves, each half will:
When a bar magnet is cut into two pieces, each piece becomes a complete magnet with its own North and South poles. This happens because the magnetic domains inside the magnet realign themselves. This shows that magnetic poles always exist in pairs and can never be separated.
Q37. The attraction of a magnet is strongest at its:
The attraction of a magnet is strongest at its poles because the magnetic force is concentrated there. This is why a magnet picks up more iron filings at its ends than in the middle. The number of magnetic field lines is maximum at the poles.
Q38. If a magnet is freely suspended, its North pole will point towards:
If a magnet is freely suspended, its North pole will always point towards the Earth’s geographic North. This happens because the Earth’s magnetic South pole is located near the geographic North pole, attracting the magnet’s North pole. This property is the basis of how a magnetic compass works.
Q39. A magnetic compass is used by:
A magnetic compass is used by many people, including sailors, pilots, travellers, mountaineers and explorers. It is a simple and reliable instrument that helps people find directions. Even today, with advanced GPS technology, compasses are still used as a backup navigation tool.
Q40. The two main parts of a magnetic compass are:
A magnetic compass has two main parts: a magnetic needle that aligns with the Earth’s magnetic field and a compass card that shows directions. The compass card has markings for North, South, East and West. The needle rotates freely on a pivot and points towards the North.
Q41. The needle of a magnetic compass is free to rotate because it is mounted on a:
The needle of a magnetic compass is mounted on a fine pivot or a sharp point at its centre, allowing it to rotate freely with very little friction. This helps the needle align itself quickly with the Earth’s magnetic field. The pivot also protects the needle from damage and ensures accurate readings.
Q42. The compass card of a magnetic compass is divided into:
The compass card is usually divided into four main directions: North, South, East and West. It is also divided into sub-directions like North-East, North-West, South-East and South-West. The four main directions help us find our way accurately.
Q43. A magnet that is shaped like a cylinder is called a:
A cylindrical magnet is shaped like a rod or a cylinder with its magnetic poles at the two ends. It can be used in many applications, such as in electric motors and generators. Cylindrical magnets are often made from neodymium or other strong magnetic materials.
Q44. The direction of a magnetic field is from:
Magnetic field lines always travel from the North pole to the South pole outside the magnet. Inside the magnet, the field lines travel from the South pole back to the North pole, forming a closed loop. This is the direction in which a small magnetic compass needle would point if placed in the field.
Q45. A magnetic compass is used to find:
A magnetic compass is used to find directions. It is a vital tool for navigation and helps people determine where they are going. It is used in hiking, sailing, flying and even in everyday situations to identify the North direction.
Q46. When a bar magnet is placed on a pile of iron filings, most of the filings stick to the:
When a bar magnet is placed on a pile of iron filings, most filings stick to the ends of the magnet, which are its poles. This is because the magnetic force is strongest at the poles. Very few filings stick to the centre because the magnetic force is weakest there.
Q47. The region in the middle of a magnet where the magnetic force is almost zero is called the:
The neutral point is the region in the middle of a bar magnet where the magnetic force is almost zero. At this point, the magnetic field lines are spread out and the force is very weak. If you place a small compass needle at the neutral point, it will not show any deflection.
Q48. Magnets are used to:
Magnets have many uses in everyday life. They are used to lift heavy iron objects, make magnetic compasses, generate electricity in generators and power electric motors. They are also used in speakers, televisions, computers and many other devices.
Q49. The magnetic needle of a compass is painted with different colours to show its:
The magnetic needle of a compass is usually painted with different colours or marked with symbols to show its North and South poles. The North pole is often painted red or marked with an ‘N’. The South pole is usually painted blue or marked with an ‘S’.
Q50. A freely suspended bar magnet comes to rest in the North-South direction because of:
A freely suspended magnet comes to rest in the North-South direction because the Earth’s magnetic field exerts a force on it. The Earth acts like a giant magnet, and its magnetic field pulls the magnet into alignment. This is why a compass always points North.
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Q51. Magnetic materials can be magnetized by:
Magnetic materials can be magnetized in several ways. One common method is rubbing them with a strong magnet, which aligns their domains. Other methods include passing an electric current through a coil around them or heating and cooling them in a magnetic field.
Q52. The first use of the magnetic compass for navigation was made by:
The magnetic compass was first invented and used for navigation by the Chinese around the 11th century. They used a naturally magnetized loadstone to find directions. Later, this invention spread to Europe and other parts of the world, changing sea travel forever.
Q53. A horseshoe magnet is a strong magnet because:
A horseshoe magnet is strong because its North and South poles are brought very close together. This shape concentrates the magnetic field between the two arms, making the magnetic force stronger. This is why horseshoe magnets are often used for lifting heavy objects.
Q54. A magnetic compass works because:
The magnetic compass works because its small magnetic needle aligns itself with the Earth’s magnetic field. The Earth acts as a giant magnet, and the needle responds to this magnetic pull. This simple principle has made the compass a reliable navigation tool for centuries.
Q55. The Earth’s magnetic field is caused by:
The Earth’s magnetic field is caused by the movement of molten iron and nickel in the Earth’s outer core. As this liquid metal rotates with the Earth, it generates electric currents and a magnetic field around the planet. This field is known as the magnetosphere.
Q56. The magnetic compass was a major invention because:
The magnetic compass was a major invention because it allowed sailors to navigate accurately even when the Sun and stars were not visible. This made sea travel much safer and easier, leading to the discovery of new lands and the growth of trade. It is considered one of the most important inventions in human history.
Q57. A ring magnet has its poles on:
In a ring magnet, the poles are usually on the top and bottom flat faces of the ring. This means one side is the North pole and the opposite side is the South pole. The magnetic field lines pass through the ring from one face to the other.
Q58. A magnet can lose its magnetic property if:
A magnet can lose its magnetism if it is heated to a very high temperature, dropped repeatedly or hammered, or placed in a strong, opposing magnetic field. These actions disturb the alignment of the magnetic domains inside the magnet. This is why magnets should be handled and stored carefully.
Q59. The magnetic needle of a compass is made very light so that:
The magnetic needle of a compass is made very light so that it can rotate freely and respond quickly to the Earth’s weak magnetic field. A heavy needle would require more force to turn and would not point accurately. The lightweight design also reduces friction on the pivot.
Q60. A compass is a useful tool for:
A compass is a useful tool because it works at any time of the day or night and in any weather condition. Unlike the Sun or stars, which may be hidden by clouds, the compass needle always points North. This makes it a reliable navigation tool for all conditions.