1 The ability of a material to retain magnetism is called: A Permeability B Retentivity C Coercivity D Inductance
2 Magnetic tapes store data using: A Tiny magnets B Electric circuits C Optical dots D Chemical marks
3 The direction of a magnetic field at a point is given by: A The direction of a compass needle's north pole B The direction of a compass needle's south pole C The direction of an iron nail D The direction of a copper wire
4 What happens when like poles of two magnets are brought near each other? A They attract B They repel C They become neutral D They lose magnetism
5 Which method is used to make a magnet by stroking? A Single touch method B Electric method C Heating method D Hammering method
6 What happens to the strength of an electromagnet if the number of turns in the solenoid is increased? A It decreases B It remains the same C It increases D It becomes zero
7 According to the domain theory of magnetism, what happens to magnetic domains when a material is magnetized? A They become randomly oriented B They align in the same direction C They disappear D They rotate in opposite directions
9 Magnetic domains become aligned in the same direction when a material is: A Heated B Hammered C Magnetised D Broken
10 Which method is used to demagnetise a permanent magnet by heating and hammering? A Stroking with another magnet B Passing direct current through a coil C Heating the magnet strongly and then hammering it D Placing it near a weak magnet
11 Which factor does NOT affect the strength of an electromagnet? A Number of turns in the coil B Current flowing through the coil C Material of the core D Color of the wire
12 What is a neutral point in a magnetic field? A A point where the magnetic field is strongest B A point where the magnetic field is zero C A point where only the north pole is effective D A point where only the south pole is effective
15 The polarity of an electromagnet can be reversed by: A Increasing the current B Reversing the direction of current C Using a thicker wire D Increasing the number of turns
16 What happens when two north poles of magnets are brought close together? A They attract each other B They repel each other C They become neutral D They lose magnetism
17 The magnetic field is strongest: A Far away from the poles B Near the poles C At the centre of the magnet D At the neutral point
18 What is an electromagnet? A A permanent magnet B A temporary magnet made by passing current through a coil C A magnet made of plastic D A magnet that cannot be turned off
19 Which method is used to magnetise a soft iron piece by placing it near a strong magnet? A Stroking method B Electrical method C Induction D Heating
20 Which device uses a permanent magnet to separate iron from other materials? A Loudspeaker B Magnetic separator C Door catch D Compass
21 کسی مقناطیسی مادے کو رگڑنے سے مقناطیسی بنانے کا کون سا طریقہ استعمال ہوتا ہے؟ A مقناطیس سے رگڑنا B مادے کو گرم کرنا C مادے کو ہتھوڑے سے مارنا D مادے کو ٹھنڈا کرنا
22 What is the direction of a magnetic field line outside a magnet? A From north pole to south pole B From south pole to north pole C From east to west D Randomly in all directions
23 Which of the following is a use of a permanent magnet? A Electric bell B Magnetic compass C Electromagnet D Television screen
24 Which method is used to magnetize a magnetic material by stroking? A Rubbing with a magnet in one direction B Heating the material C Hammering the material D Cooling the material
25 A material that is weakly repelled by a magnet is called: A Ferromagnetic B Paramagnetic C Diamagnetic D Non-magnetic