Kerala SCERT Class 8 Science Chapter 11 Magnetism Question Answer Solution Here. Kerala Board Class 8 Students can find Here 11th Chapter Magnetism Notes provide by our Teacher. Important Question Answer from Chapter 11 Magnetism.
- Board- Kerala Board.
- Class – 8.
- Subject – Science Part 1
- Chapter – 11.
- Chapter Name – Magnetism.
- Topic – Question Answer Solution.
Question: (1) _____ is magnetic needle arrangement in such way that it can rotate freely inside an aluminium or plastic cup.
Ans: – Compass.
Question: (2) ______ is experienced in all dimensions around a magnet?
(a) Magnetic force
(b) Natural force
Ans: – Magnetic force.
Question: (3) the phenomenon of a magnetic substance acquiring magnetism due to presence of a magnetism________?
(a) Magnetic Induction
(b) Electrical Induction
Ans: – Magnetic induction.
Question: (4) __________ is has greater susceptibility?
(a) Soft iron
(b) Steel
Ans: – Soft iron.
Question: (5) the ability of magnetic substance to get magnetised under the influence of a magnetic field is ___________?
(a) Susceptibility.
(b) Retentively
(c) Permeability
Ans: – Susceptibility.
Question: (6) __________ is the ability to retain the magnetism thus acquired?
(a) Receptivity
(b) Susceptibility
(c) Permeability
Ans: – Receptivity
Question: (7) ____________ is the ability of substance to pass magnetic lines of force through them?
(a) Receptivity
(b) Susceptibility
(c) Permeability
Ans: – Permeability.
Question: (8) _________ can be made by passing electric current through insulating copper wire wound or a soft iron piece?
Ans: – Electromagnets.
VERY SHORT QUESTION:
Question: (1) what is electromagnet?
Ans: – Electromagnets can be made by passing electric current through insulating copper wire wound on a soft iron piece.
Question: (2) what is permeability?
Ans: – Permeability is the ability of substance to pass magnetic lines of force through them.
Question: (3) what is magnetic induction?
Ans: – The phenomenon of a magnetic substance acquiring magnetism due to presence of magnet is magnetic induction.
Question: (4) what is magnetic field?
Ans: – Magnetic lines of force are experienced in all dimensions around a magnetic field.
Question: (5) what is meant by natural magnets?
Ans: – They come to know as leading stone (load stone or lodestone) as they exhibited this property magnets like these, found in nature are natural magnets.
SHORT NOTE:
Question: (1) explain the magnetic induction?
Ans: – The phenomenon of a magnetic substance. Substance acquiring magnetism due to the presence of a magnet is magnetic induction. These magnetic force is acquired by the magnetic substance is the induced magnetism.
Question: (2) what strength of electromagnets depends?
Ans: – The number of turns of coiled conductor the strength of current. The area of cross section of the soft iron placed inside the coil this strength of electromagnets depends.
Question: (3) what is magnetic flux density?
Ans: – Magnetic force is experienced in all dimensions around a magnet. This region around a magnet where the influence is felt is the magnetic field.