2 Which of the following is used to store data in a computer hard disk? A Permanent magnet B Electromagnet C Magnetic domains D Magnetic tape
3 What is the distance over which magnetic force can act? A Very short distance B Infinite distance C Limited to the magnet's size D Depends on the material
4 Which of the following is a characteristic of magnetic field lines? A They are visible B They are continuous C They have gaps D They are random
6 What is the name of the closed loop of magnetic field lines? A Magnetic circuit B Magnetic domain C Magnetic flux D Magnetic dipole
7 What is the name of the force between two magnets? A Gravitational force B Magnetic force C Electrostatic force D Nuclear force
8 What is the shape of the magnetic field around a straight current-carrying wire? A Straight lines B Circular loops C Elliptical D Random
9 Which of the following represents the magnetic field lines correctly? A They cross each other B They never cross C They are parallel D They are circular
10 What is the direction of magnetic field lines inside a magnet? A North to south B South to north C East to west D West to east
12 What is the effect of heating a magnet? A It becomes stronger B It becomes weaker C It remains the same D It changes polarity
13 Which of the following is used to measure magnetic flux? A Gaussmeter B Fluxmeter C Teslameter D All of the above
14 What is the name of the magnetic material that retains magnetism even after the external field is removed? A Soft magnetic material B Hard magnetic material C Diamagnetic material D Paramagnetic material
16 What type of magnet is made from a mixture of aluminum, nickel, and cobalt? A Lodestone B Alnico C Ferrite D Neodymium
17 What happens when the north pole of one magnet is brought near the north pole of another magnet? A They attract B They repel C They stick together D They become stronger
18 What is the effect of a magnetic field on a moving charge? A It accelerates the charge B It deflects the charge C It stops the charge D It has no effect
19 Which of the following is a way to make a permanent magnet? A Rubbing with another magnet B Placing in a magnetic field C Both A and B D Heating and cooling
21 What is the name of the process of aligning magnetic domains in a material? A Magnetization B Demagnetization C Polarization D Ionization
22 What is the name of the phenomenon where a magnetic field induces a current in a conductor? A Magnetic induction B Electromagnetic induction C Magnetic flux D Magnetic resonance
23 What is the direction of the magnetic field at a point? A Direction of force on a north pole B Direction of force on a south pole C Tangential to field line D Both A and C
24 What is the name of the property of a material to become magnetized when placed in a magnetic field? A Susceptibility B Permeability C Retentivity D Reluctance