Physics-Objective Related Question Answers
551. Molecular theory of magnetism was proposed by?
Weber
552. The magnetism of a substance decreases while on?
Heating or hammering
553. In a magnet the magnetic line of force are from?
North to South pole
554. Artificial magnets made by the use of electricity are called?
Electromagnets
555. The instruments which are dependent of magnetic power of electricity are?
Fan; telephone receiver; dynamo etc
556. The scientist who stated that the earth behaves as a huge magnet?
William Gilbert
557. A Magnetic force of attraction at the centre of bar magnet?
Zero
558. A coil of insulated wire bound on a rod shaped form made of solid iron is called?
Solenoid
559. The unit of magnetic flux density?
Tesla
560. Unit of magnetic flux?
Weber
561. Substances acquire strong magnetism in the direction of magnetic field?
Ferromagnetic substances eg: Nickel; Iron; Cobalt
562. Strongest type of magnetism?
Ferro magnetism
563. Refrigerator magnet is?
Ferro magnet
564. Ferro magnetism was discovered by?
Louis Neel
565. Substance acquire feeble magnetism in the direction of magnetic field is called?
Paramagnetic Substances eg: Platinum; Oxygen; manganese etc
566. Paramagnetic substances is temperature dependent Substances acquire weak magnetism in the direction opposite to the magnetic field is called?
Diamagnetic substances eg: inert gases; alcohol; copper; gold; water; hydrogen etc.
567. Substance used for making electromagnets is?
Soft iron
568. Electromagnets are used in?
Electric bells; telephones and telegraphs
569. An object made from a material that is magnetized and creates its own persistent magnetic field is called ?
Permanent magnet
570. Powerful permanent magnets are made from?
Alnico
571. Alnico is an alloy of?
Aluminium; Nickel; Cobalt and Iron
572. Some organisms can detect magnetic field. This ability is called?
Magnetoception
573. Technique using a powerful magnetic field to diagnose and treat diseases?
MRI (Magnetic Resonance imaging)
574. A magnet made by binding insulated copper wire over a soft iron piece and passing an electric current through the wire is called?
Electro magnet (temporary magnet)
575. Bulbs are usually called as?
Filament lamps or Incandescent lamps
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