100 Important Magnetism and Electromagnetism MCQ Question and Answer | PDF Free Download
1.In which of the materials the spin moments associated with two sets of atoms are aligned antiparallel to each other?
- AFerromagnetic material
- BFerrites
- CFerromagnetic materials
- DAnti-ferromagnetic materials
2.Temporary magnets are used in
- ALoud-speaker
- BGenerators
- CMotors
- DAll of the above
3.The main cause of noisy solenoid are
- AStrong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
- BUneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
- CBoth of above
- DNone of the above
4.Strength of electromagnet can be increased by
- AIncreasing the cross-sectional area
- BIncreasing the number of turns
- CIncreasing current supply
- DAll above methods
5.Core of electromagnet should have
- ALow coercivity
- BHigh susceptibility
- CBoth of the above
- DNone of the above
6.Magnetism of a magnet can be destroyed by
- AHeating
- BHammering
- CBy inductive action of another magnet
- DBy all above methods