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2.14 Multiple Choice Questions, , a, , Q.2, , Electric Field & Magnetic Field, , The direction of a magnetic field within a magnet is, (a) from south to north, , (b) from north to south, , {c) back to front, , (d) front to back, , The ability of a material to remain magnetized after, removal of the magnetizing force is known as, , (a) permeability (b) reluctance, (c) hysteresis (d) retentivity

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a3 when the north poles of two bar ‘iia, , a4, , a5, , a6, , Q7, , Qs, , Qg, , Q.10, , pasic Science (Physics) (MSBTE - I Scheme), 2-48, , close together, there will be ‘gnets are brought, , (a) a force of attraction, , (b) a downward force, , () a force of repulsion, , (d) no force, , If positively charged particles enter with high vetoci, from the sky towards the earth, then the care, magnetic field will deflect them towards, , (a) south (b) west, , (c) north (d) east, , The unit of flux density is known as, (a) (b), (c) (d), , a weber, a Maxwell, , Magnetomotive force, atesla, , The energy resides in a current carrying conductor in, the form of, , (a) magnetic field, (b) electrostatic field, (c) thermal vibration, , both electrostatic field and thermal vibration, , (a), , When current is passed through a coil, it gets heated, up. This is due to., , (a) Collision of proton, , (b) Collision of electron, , (c) Collision of neutron, , (d) Collision of proton and neutron, , The attractive power of a bar magnet is maximum at:, (a) Middle (b) Throughout magnet, , (c) Noneofthe above (d) Ends, , if, Who first advanced the molecular theory ©, , magnetism?, (a) Faraday (b) Morse, (c) Ampere (d) Weber, , A mariner’s compass is used:, , (a) For determination of direction, (b) To Compare magnetic moments, (c) For determination of H, , Electricity, Magnetism and Semiconductors, , The electric intensity at a point 50 cm from a charge, of 3.2 micro coulomb in a medium of dielectric, constant 2 is equal to, , (a) 50x 103 WC, () 57.6x 103 WC, , 55x 109 NC, 60 x 103 NIC, , (b), (d), , Hint: Q=3.2x1076c, , R = 50cm=0.5m,, K = 2,B=9x 10-%-&, kr?, , Q.12 Aneutral point is found where:, , (a), , Two magnetic fields have equal, and opposite directions., , magnitudes, , (b), (), , A magnetic field has circular lines of force, , Two magnetic fields have equal, and the same direction., , magnitudes, , (d) — Amagnetic field is at sight angle to the earths, , magnetic field, , Q.13 The force of repulsion b/w two magnetic poles, , depends upon:, (a), (b), (c), (a), Which of the following is magnetic material?, (a) (b) Cobalt, , (c) (d) All of these, , The process of imparting the properties of the natural, , magnets to the other bodies is known as:, (a) (b) — None of these, , (c) (a), , If magnet Is broken into two equal pieces the pole, strength of each half will be:, (a) 1/2 (b) Same, , It is learnt that all magnetic substances lose their, , Distance b/w two poles, , The strength of two poles, , Nature of the medium separating them, All of these, , Q.14, Iron, Nickel, , Q.15, , Magnetic, , Magnetization Magnetism, , Q.16, , (c) 1/4 (d) Double, , Q.17, magnetism when:, , (a) Brought near a magnetic field, (b), (c), , Placed in water., Heated, In winter, , , , (d) For determination of dip at a place, , (@), , , , Scanned with CamScanner

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Basic Science (Physics) (MSBTE - I Scheme), , Q.18 When an iron piece is magnetized its length:, (a), (b), (c), , Increases considerably, Decreases slightly, Increases slightly, , (d) Decreases considerably, Q.19 Magnetism at the centre of the bar magnet is:, (a) = Minimum (b) Maximum, (c) Zero (d) None of these, , The ability of a material to maintain a magnetized, state (without the presence of a magnetizing force) is, called retentivity., , (a), , Q.20, , True (b) False, , Q.21 The unit of magnetic flux density is the weber., , (a) (b), Calculate the intensity of electric field at a point 25 cm, , from a charge of 4.8 ic in a medium of dielectric, constant 3.6, , False True, , Q.22, , , , (a) 1.9x 107 WC (b) 1.9 10* NIC, () 1.9 10° NIG () 19x 107 NIC, Q.23 A group of force lines going from the north pole to the, south pole of a magnet is called the magnetic __., (a) _ retentivity (b) reluctance, (c) hysteresis (d) flux, Q.24 Electric lines of force are always to the, surface of charged body., (a) Parallel (b) — Normal, (c) _ Bisector (d) Median, , Q.25 The force of attraction between two charges of 30 pc, and 50 pc are separated by 1 m distance is 13.5 N., , Then the dielectric constant of the medium is, , (a) 1 (b) 15, () 1.75 (d) 2.25, a4, Hint : use, F = 9x10 9x—15?, 9x10°xq,q,, K =, , , , 2-49, , , , Q.26, , Q.27, , Q.28, , Q.29, , Q.30, , Q.31, , Q.32, , , , , , , , , , , , , , , , , , , , Electricity, Magnetism and Semicondy tery, Magnetic flux flows from the north pole to the 104, pole within the magnet., , (a) False True, , (b), The force of attraction or repulsion between two, , magnetic poles is inversely proportional to the squarg, , of the distance between them. This is known as, , (a) Newton's first law, , (b) Faraday’s first law of electromagnetic induction, (c) __ Boyle’s law, , (d) Coulomb's law, , The net electrical charge in an isolated system, remains constant. This is known as, , (a) Lawof conservation of charge, , (b) | Coulomb's law, (c) Boyle’s law, (d) _ Lawof conservation of energy, , The point in a magnet where the intensity of magnetic, lines of force is maximum., , (a), (°), , Magnetic pole South pole, , (b), , North pole (d) —_ Unit pole, , The space outside the magnet where its pole have a, force of attraction or repulsion on a magnetic pole is, called, , (a), (b), (c), (d), , Magnetic field, , Electric field, , Electromagnetic field, , Free Space Field, , The straight line passing through the two poles, magnetis called, , (a) Realaxis, , (b) Cartesian axis, (c) Magnetic axis (d) Imaginary axis, The path along which the unit pole, , , , move in magnetic field is called magnetic lines, force., , (a), (c), , East (b), , (d), , West, , North South, , , , , , Scanned with CamScanner

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Q.34, , Q.35, , Q.36, , Q.37, , Q.38, , Q.39, , Q.40, , Q.33 The force acting on unit Positive cI, , , , , , harge in an el, field is called as electric, , (a), (b), (c), (a), , Electric potential, Electric intensity, Electric current, Electric flux density, , The phenomenon by which a Magnetic substance, becomes a magnet when it is Place neara Magnet, , (a) — Magnetic effect, , (b), (c), (d), , Magnetic phenomenon, Magnetic induction, Electromagnetic induction, , A substance that attracts pieces of iron, (a) Conductor —(b), (c) Magnet (d), , Semiconductor, All of the above, , Which of the following is a natural magnet?, (a) Steel (b), (c) (d), , The total number of magnetic lines of force ina, magnetic field is called, , Magnesia, , Lodestone Soft iron, , (a) Magnetic flux, , (b) Magnetic flux density, (c) Magnetic flux intensity, (d) — Magnetic potential, , The current of electric circuit is analogous to which, quantity of a magnetic circuit, , (a) Mmf (b), (c) Flux density (d), , Flux, Reluctivity, , Defined as the number of lines per unit area through, , any substance in a plane at right angles to the lines of, force, , (a), (°), , Flux, Flux density, , Flux lines, Flux intensity, , (), (d), The force acting on a unit n- pole placed at that point, is called, , (a), (b), (c), (d), , Magnetic field intensity, Electric field intensity, Electromagnetic field intensity, Intensity Magnetization, , , , Q.41, , Q.42, , Q.43, , Q.44, , Q.45, , Q.46, , Q.47, , .Magnatis,, Refers to the Magnotic lines, (a) Flux (b) Hysteresis, (C) Current (9), , Magnetomotive foree, All magnetic field Originates from, , (a) moving electric charge, , (b) tron atoms, , (c) — Magnetic domain, , (d) Permanent magnets, , Magnetic fields do not interact with, (a), (b), (c), (d), , Moving permanent magnets, , Stationary permanent magnets, , Moving electric charges, , Stationary electric charges, , The force between two magnetic poles varies with the, , distance between them. The variation is to, the square of that distance., , (a) Equal, , (b) Greater than, , (c) Directly proportional, (d) Inversely proportional, , The unit of electrical energy is, (a) (b), (c) (d), , Joule Watt- second, , Kilowatt- hour All of these, , The energy stored in an electrostatic field or, electromagnetic field is called, , (a), , Electromagnetic energy, , (b) Kinetic energy, , (c) Potential energy, , (d) Rest energy, , The force between two magnetic poles is ___ their, poles strength., , (a) equal to, , (b) directly proportional to, , (c) _ inversely proportional to, , (d) directly proportional to the square root of, , , , We reoeenit, , Scanned with CamScanner

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Basic Science (Physics) (MSBTE - I Scheme) 2-51, , Q.48 A magnetic field is, , (a) The current flow through space around a, permanent magnet, , (b) The force set up when current flows through a, conductor, , (c) The force that drives current through a resistor, (d) The force between the plates of a charged, , , , capacitor, Q.49 Ohm's law can be used only to a circuit or, component., (a) —_ Unilateral (b) Exponential, (c) _ Trivalent (d) Linear, Q.50 One coulomb of charge consists of, electrons., (a) 624x 10° (b) 62.4x 10, () 624x140" (a) 0.624 x 10°, , Q.51 A one cubic cm of copper has how many free, electrons at room temperature?, , (a) 80x10" (b) 85x 107, () 20x10" (a) 50x 10”, Q.52_ Electronic current in a wire is the flow of, electrons., (a) free (b) valence, (c) bound (d) loose, Hint! r= 25cm 0.25 m, Q = 48x10-%C, K = 3.6, E = 9x10 x8, , Q.53 Electromotive force in a circuit, (a) causes free electrons to flow, (b) increases the circuit resistance, (c) maintains circuit resistance, (d) is needed to make the circuit complete, , Q.54 The resistance of a material is its area, , of cross-section., , (a) directly proportional, , (b) independent of, (c) _ inversely proportional to, (d) equal to, , , , Electricity, Magnetism and Semiconductory, , Q.55 If the length and area of cross-section of @ wire arg, doubled, then its resistance, , (a) becomes four times, , (b) becomes sixteen times, , (c) _ remains the same, , (d) becomes two times, , A length of wire has a resistance of 10 ohms. What is, the resistance of a wire of the same material three, , times as long and twice the cross-sectional area?, (b) 20 ohms, , (d) 7 ohms, , Q.56, , (a) 30 0hms, (c) 15 0hms, , What is the SI unit of specific resistance or resistivity?, (a) Ohm-circular mil per inch, (b) Ohm-circular mil per foot, (c) Ohm-m, , (d) = Ohm-cm, , Q.57, , , , with an, , Q.58 The resistivity of a conductor, increase in temperature., (a) increases (b) decreases, (c) remains thesame (d) becomes zero, , Q.59 Whats the SI unit of conductance?, (a) Siemens (b) — Mhos, (c) Ohms (@) 1/Ohms, Q.60 If the resistance of a material 2 m long and, 2 m’ in area of cross-section is 1.6 x10°° Q, then its, resistivity is :, (a) 32x 10° o.m (b) 1.6x 107° O.m, (2) 0.64x10° Om (dy 0.16 x 10°? o-m, Q.61 Whatis the SI unit of Conductivity?, (a) Ohms/m (b) Ohms-m, (ce) Siemens-m (d) Siemens/m, Q.62 The tem,, perature coeffi, Sncversene ‘cefficient of resistance of, (a) positive, (c) negative a na, (a) Infinite, Q.63, , The temperature Coeffici, , lent, conductor Of resistance of @, , with an Increase in temperature., (a) increases (b), lecreases, , () remains thesame (q) becomes negative, , Scanned with CamScanner