thefunalways.com – MCQs, Mock Tests | General Science Basic Science Magnetic Field

1 The permeability of free space is

A 1 H/m B 0 C 4? ? 10-7 H/m D 4? ? 107 H/m

2 The unit of pole strength is

A Am B A/m C Wbm D Wb/m

3 The intensity of magnetic field is the force acting on

A a short bar magnet B a long bar magnet C a unit north pole D a unit south pole

4 The ratio of the flux density to the magnetic field strength in a medium is its

A intensity of magnetization B susceptibility C relative permeability D permeability

5 A freely suspended magnet will always come to rest in the direction

A East-North B North-West C North-South D South-West

6 ttractive force exists between

A two south poles B two north poles C poles of the same magnet D one north pole and one south pole

7 The unit of magnetic flux is

A weber B tesla C weber-metre D ampere-metre

8 The flux density is

A a scalar quantity B is a vector quantity C the magnetic moment per unit volume D the dipoles per unit volume

9 A uniform magnetic field

A is produced by a bar magnet B is produced by an isolated north pole C has parallel flux lines D produces no force on a north pole

10 The magnetic flux

A is a scalar quantity B is a vector quantity C denotes the amount of the force on a north pole D is the magnetic moment of a bar magnet

11 Force of the attraction between two poles placed in vacuum

A decreases as the pole strength increases B increases with decrease in distance C decreases with decrease in distance D increases with decrease in pole strength

12 When a magnet is dipped in iron filings the fillings

A cling throughout the magnet B cling to the magnet at the ends only C cling to the magnet at its center only D do not cling to the magnet

13 Ampere-meter is the unit of

A magnetic moment B pole strength C electric potential D magnetic potential

14 The relationship between the magnetic induction B and the intensity of magnetic field H is

A ï¿½0 = H/B B B = ï¿½0 H C H = ï¿½0 B D ï¿½0 = HB

15 The distance between the poles of a magnet is called

A magnetic axis B magnetic moments C length of the magnet D magnetic length

16 The unit of permeability is

A H B Hm C H/m D Wb

17 ï¿½ indicates the property of

A a dielectric B a conductor C a magnetic material D an insulator

18 The force experienced by a magnet of pole strength m in a uniform magnetic field of strength H is

A mH B m/H C H/m D mWb

19 A line of force in a magnetic field

A is a line joining the poles B is a path along which an isolated charge moves C is a path along which a short bar magnet moves D is a path along which an isolated north pole moves

20 The unit of intensity of magnetic field is

A weber/metre2 B weber/metre C ampere-metre2 D ampere /metre

21 Force between two identical magnets is proportional to

A m/d B m2/d C m/d2 D m2/d2

22 22.The direction of magnetic field is the direction along which

A a tiny bar magnet moves B an isolated south pole moves C an isolated north pole moves D a unit positive charge moves

23 ï¿½ is the symbol for

A permittivity B permeability C conductivity D resistivity

24 The relationship between relative permeability of a medium and permeability of free space is

A ï¿½r = ï¿½r ? ï¿½0 B ï¿½ = ï¿½0 ï¿½r C ï¿½r = ï¿½0 / ï¿½ D ï¿½ = ï¿½0 / ï¿½r

25 The south pole of the earths magnetic field

A is at the centre of the earth B lies along the equatorial line C lies in the northern hemisphere D lies in the southern hemisphere

26 The value of the relative permeability of air is

A 4? ? 10-7 B 0 C -1 D 1

27 The north pole of the earths magnetic field

A is at the centre of the earth B lies along the equatorial line C lies in the northern hemisphere D lies in the southern hemisphere

28 The dimension of ï¿½r is

A ML0 T -1 B LT -1 C HM -1 D nil

29 The magnetic axis of a magnet is

A perpendicular to the length of the magnet B along the line joining the poles C the direction of zero magnetic flux D a line of zero moment

30 One tesla is equivalent to

A weber B weber/metre2 C amp-metre D amp/metre

31 The relationship between magnetic flux and magnetic induction B is

A ? = B/A B B = A/? C B = ? A D B = ?/A

32 The total number of lines of induction crossing any area is known as

A magnetic induction B magnetic flux C magnetic field D mutual induction

General Science — Quiz

Basic Science Magnetic Field