1 Uma is studying the solenoid method of inducing magnetism. She knows that a solenoid is used in electric bells. What is the role of the electromagnet in an electric bell? A To strike the bell B To produce sound C To generate electricity D To store energy
3 Diamagnetic materials are: A Strongly attracted B Weakly attracted C Weakly repelled D Strongly magnetized
4 Ferromagnetic materials are: A Strongly attracted by magnets B Weakly attracted C Weakly repelled D Not affected
5 An electromagnet works on the principle of: A Static electricity B Chemical reaction C Magnetic effect of current D Electrolysis
6 Paramagnetic materials are: A Strongly repelled B Strongly attracted C Weakly attracted D Not affected
7 The strength of an electromagnet can be increased by: A Reducing current B Increasing number of turns C Using plastic core D Reducing turns
8 Which are the two ends of a magnet called? A Electric poles B Positive and negative ends C Magnetic poles D Charged ends
9 Rachel is studying the difference between magnetic and non-magnetic materials. She knows that non-magnetic materials are not attracted to magnets. Which of the following is a non-magnetic material? A Cobalt B Nickel C Steel D Copper
10 David is studying ferromagnetic materials. He knows that ferromagnetic materials are strongly attracted to magnets and can be permanently magnetized. Which of the following is a ferromagnetic material? A Cobalt B Aluminum C Copper D Zinc
11 George is studying induced magnetism. He knows that a magnetic material can be magnetized by stroking it with a magnet. What is the method of magnetizing a steel bar by repeatedly stroking it called? A Hammering B Stroking C Heating D Induction
12 Rachel is studying the magnetic field of a bar magnet. She knows that the magnetic field is a vector quantity. What does the direction of the magnetic field represent? A The direction of the force on a north pole B The direction of the force on a south pole C The direction of current D The direction of electron flow
13 Fatima is studying magnetic shielding. She knows that magnetic shielding is used to protect sensitive instruments from magnetic fields. What material is commonly used for magnetic shielding? A Aluminum B Soft iron C Copper D Plastic
14 Uma is studying biomagnetism. She knows that some organisms detect the Earth's magnetic field for navigation. Which of the following organisms is known to use biomagnetism for navigation? A Elephant B Pigeon C Eagle D Dolphin
15 The closeness of magnetic field lines indicates: A Direction of field B Strength of field C Type of magnet D Mass of magnet
16 Hina is studying the hammering method of inducing magnetism. She knows that hammering a magnetic material in a magnetic field can align its domains. What happens when a magnetic material is hammered? A It loses its magnetism B It becomes permanently magnetized C It becomes a non-magnetic material D Its domains become randomly oriented
17 Which magnet loses its magnetism easily? A Permanent magnet B Temporary magnet C Bar magnet D Earth magnet
18 Julia is studying the solenoid method of inducing magnetism. She knows that a solenoid is a coil of wire. What happens when a magnetic material is placed inside a current-carrying solenoid? A It becomes a temporary magnet B It becomes a permanent magnet C It loses its magnetism D It has no effect
19 Quinn is studying biomagnetism. He knows that some animals use the Earth's magnetic field for navigation. Which of the following animals is known to use magnetic field for migration? A Butterfly B Salmon C Ant D Cockroach
20 Which property of a magnet causes it to attract iron? A Electric charge B Magnetic field C Gravity D Friction
21 Hina is studying the direction of the magnetic field at a point. She uses a compass to determine the direction. In which direction does the north pole of a compass point in a magnetic field? A Towards the south pole of the magnet B Towards the north pole of the magnet C It points randomly D It points to the center
22 Magnetic field lines always emerge from: A South pole B Center of magnet C North pole D All sides equally
23 Magnetic shielding is used to: A Increase magnetic field B Reduce unwanted magnetic fields C Create electricity D Store data
24 Which application uses magnetism in data storage? A LCD screen B Hard disk C Calculator D Solar panel
25 Sam is studying the Earth's magnetic field. She knows that the Earth behaves like a giant magnet. What is the direction of the Earth's magnetic field inside the Earth? A From north to south B From south to north C From east to west D From west to east