ERG stands for f s Bwp-ay a)electro radio graphy ——_bjnergy radio graph ttectric rating graphy dElectric radiation graph 9. ECG, EEG and ERG ,are machines based on the changes of ___ in our body. (a) temperature (bIpotential difference ic) energy {d)none of them 10. AM ECG records... between points on human skin generated by electrical process in heart msg voltage {b)_curent (9 electrictlux ——_(a)allof these 11, In Bhe direction indicated by an electric field line. (a) the electric field strength must increase BP) the electric field strength must decrease (c) the potential must remain constant {d) the potential must decrease 12. The quantity represented by \V Is known as MolA5, Dpk-16, 82) {a) change in potential “(b} pestmmabal gradient (c)electric potential —_—_(d) electric energy 13, The negative ofthe potential gradient is Mut39,Shat2s {2) potential energy {b) electrostatic force: G@belectric field intensity (d) electromotive force 18. 1NC-4= _ . tan (a}1Vm Po). vm" (hv' my (dj vim 15. Electric field intensity gives value of potential gradient when distance between the plates is minimum almaximum B)minimum constant <)none of them _— 16. WV /r, the negative sign show that the direction of E is along: (2) Increasing potential (b) Decreasing potential (g) Increasing & Decreasing potential (d) None 17. Aparticle of mass m and charge q is released from rest in a uniform of electric field E. The K.E attained by the particle after, moving a distance ‘d’ is ty & (b) ate (o) ae’ of q @ 38. A charge of 10"C between two parallel plates 1 em apart experience a force of 10°°N: seoas a) 10V (b) 10°V =3 10'v a) 10°v 19. Work done in beinging a unit position charge from infinity to that point in an electric field is called pis (a) potential diference —_(b) Resistance (€) capacitance ‘afe) Absolute potential 20. The absolute potential ata point distant 20cm from a charge of 2c is awuinat (a) 9x10°v (b} 9x10°v ()9x10°V (d) 9x10°v 21. The work done in carrying a postive charge from one point to another on an equipotential surface. (2) finite and pasitve eum (b) 2er0 (6) finite and negative (d) infinity 22, The magnitude of electric field between two separated charged plates can be calculated by using (@) E=Avd ee =ae ) ar b=! d a. & d 23, Absolute potential ference, due to a point charge of 1C ata distance of 1m is given bysma> (a) 9% 10 volts (b) 9% 107 volts, {c) 9x 20° volts {d) 9 10° volts 24, Two opposite point charge of same magnitude separated by distance 2d, electric potential mid-way between them is 5, Ak, S23 @v (b) 2v eeerer0 (ave 25, charged body is moved against the electric fel, it wil gain: thes, ut? (a) Pe (b) Ke (c) Mechanical enerey ‘eta Electrical potential energy 12.10 ELECTRON VOLT 1. One electron volt (eV) is equal to pat (a) 1.610% tb) 1.610%) (c).6101C* (0) 1.6010" Nm? 2._ When postive charges allgyed to move am postive to negative late, then t wil gain (2) potential energy {b) kinetic energy (c} mechanical ene «trie potential en 2. Wa charged body is moved against the electri fl, wil an ” Te) eck pelea ones (2) potential energy (b) kinetic ener (] mechanicat “ ic potential en a —imectanatengy etic penny {a} potential (b) electric field ck) energy (A) charge : i=e an 5. 1 Joule Is equal to _..éleetron volt wt, MulI6 (A) 16x10" () 6.25x10" (0) 1.610" (4) 6.25x10" 6. Apartcie carrying a charge of 2¢ falls through a potential difference of AV. The energy required by it. Mul, sd-15, 022 (go9.6 x10") (bh) 96*10") fey 6x 10) (4) 6.25 x10") 7. Electrostatic force as compared to the gravitational force | {a} very weak exabvery strong (oinfinite (8) none of these 8, Gravitational force is an (a) attractive force {b) repulsive force (c) nuclear force (d) none of these 9, Electrostatic fore 18 & onan Force (a) attractive Ot wlio Mids i 12.12 CHARGE ON AN ELECTRON BY MILLIKAN’S METHOD 1. According to Stokes law drag force due to air acting upon the droplet is given by (a) F= 62 () F=6nm, eg F = 6xmry, (a) F =6n0 ry, 2. The expression for the radius of the droplet falling under the action of gravity is given by I my @r po {b) » 2P8 28 3. fp electric field that will balance the weight of an electron should act (a) in the upward direction (c) along the surface of the sphere 4. charge on two protons is equal to (a)1.6x10%c {b}-1.6x10%¢ P3210" {b) in the downward direction {d) none of these 6}-3.2x10%C 5. The charge on the droplet in Millan's experiment was caleuated by the formula : (a) q=me/dv (b) ) =mad/V (d) q=d/mev mad ot) q= mac (9) 8 6. In Millikan’s experiment, the oil drop can be suspended between two plates when gravitational force is equal to (2) Magnetic force ib) electric force (c) Normal force (d) all of these An electric field that balance the weight of an electron will act. (a) downward 7 upward, (c) along the surface of sphere (d) all of these 8. According to Stoke’s law qs mgd @) Fatarf to) = MEF =6nn1v (a F = v mgd In Millikan’s oil drop experiment a charged particle of mass ‘m’ is in equilibrium in an applied electric field E. if the direction of electric field is reversed then accerelaration of the particle will be: {a) zero tb) ef (8 a) saen 10. It is required to suspend a proton of a charge ‘q’ and mass ‘m’ in an electric field the strength of the field must be: Ube 19- Ae a i (E= w q mg Swia8 12.13 CAPACITOR ——— 1. An expression for the magnitude of the charge on either of the plates of a capacitor is given by c de, =O =C Q=—— (d) Q= = ()Q=CA alt) Q=CV 0 7 (9 O=— 2. The capacitance of a capacitor depends upon the wt {2} geometry of the plates (b) medium between the plates {c) separation between the plates = (a) al of these ‘The Sl unit of capacitance is Dales, Mult7, Bw, Fd gy" () VC" () CN" ta NC"4. Which component could be used to store electrical charge in an electrical circuit? (adgapacitor (b)light-dependent resistor (c) resistor (4) thermistor 5. The amount of charge which can be placed on a capacitor does not depend on oa (a) the dielectric strength of surrounding medium (b) its capacitance 6 (c)its potential (d) its size or shape 6, fhe abitity of a capacitor to store charge Is called ‘ (a) conductance (b) conductivity. (c) resistivity 1) capacitance 7. tn what form is the energy stored in an capacitor? se {a) magnetic (b) electrostatic {c) both magnetic and electrostatic (d) none of these 8. Ifa capacitor has a charge of 10 and the potential difference between the plates is 100V, its capacitance is wena oe) OF (b) 10F {c) 1000F (d) 1000uF 9. Thenet charge on a capacitor (each plate having magnitude of charge of charge q) is: aig (a) copper (0)2q (o)a/2 en (6) zer0 10. The capacitance of a capacitor depends upon: hs {a) Thickness of plates(b) Charges on the plates “e) voltage applied {d) Geometry of the capacitor 12.14 CAPACITANCE OF A PARALLEL PLATE CAPACITOR 1. If Q' is the charge on either of the plates of a parallel plate capacitor of area ‘A’, the surface charge density on the plates s given by 4 24 Q o=e (bo = ed) == Q Q 4 2. If medium between the plates of a parallel plate capacitor is air or vacuum, then its capacitance is given by sis, mulas - AE, Ae, . _ Ae, . Ae, aC.=—= C= (OC. = (aC... = 54 C=C =F | 20 y 3. some insulating material of relative permittivity ‘¢," is inserted between the plates of a parallel plate capacitor, then ‘capacitance is given by d d - d Aé,£, ()Cyeg =F— (Cy = (Cues = watt) C,,.5 = mt AEE, Yds, Ae, wd Ma dielectrics placed between the plates ofa capacitor aka7, Guise (2) ts capacitance decreases (b) its capacitance increases {its capacitance is unaffected (a) none of these 5. The capacitance of a capacitor increases with a decrease in uaa {a} dielectric constant (b) permittivity {c) plate area ‘= (d) plate separation 6. the charge stored on any of the two plates of a parallel plate capacitor is directly proportional to (a) resistance (b) resistivity (c) amount of current q=xa(d) potential difference 7. _When the distance between the plates ofa parallel plate capacitor is decreased, the capacity of the capacitor Is sais a) increased {b) decreased {c) unchanged (d) vanished 8. fa dielectric of relative permittivity er between the plates ofa charged capacitor is placed its capacitance sees {a) decreases (6) remains same (b) increases (8) some time increases then decreases j> Which material should be inserted between the plates of a capacitor in order to increase it capacitance? Swit thea? {2} copper emt) Mica (6) ron (a) Tin 12.15 ELECTRIC POLARIZATION OF DIELECTRICS 1, When two point charges of equal magnitude and opposite signs exist very cose to one another, the arrangement Is called mma) an electronic dipole {b) an amperian current {c)a null charge (4) a neutral source 2, When a dielectric material is placed in an electri field it sees (a) conducts (b) exhibits an electrical discharge mmm _(c) becomes polarized (a) undergoes electrolysis3. Due to polarization surface charge density of capacitor (a) creases {b)Devvesses {ch semein conmant (tone othe 4. Under the action of electric field, molecules of » dletectric (a) Begging to vibrates) ave tonined scaligen denied une 5. Dielectrics ak called (al Conductor pirat (0) som: conductor (8) mane ofthese 6. _Theciectrie potential at «sponta electric dipole ports Rov iy Ov wow in 7. Due to polarization, electric field FE. ia (a) focreases exe) Decrenes oo ee 12,16 ENERGY STORED IN A CAPACITOR T. The expression of energy stored in a capacitor is given by bec wer-lo we 1 (B= *(C¥) 2. Will a capacitor store more energy with a dielectric other than air? ja) yes: (b) no (c) any of the two (d) none of these Sie charged capacitor, the energy resides a} the negative plate (b) nthe postive pate (em nthe fed Between the plates (6) around the edge ofthe plates 4 Capacitors connected in paralie! have a) the same electric intensities between their plates (b) the same charge {c)@ resultant equal to the sum of the individual capacitances _(d) None of above 5. The electrostatic energy density ofa parallel plate capacitor is given by or cv? Q’ NX ws oO w= 1) All ofthese 6 The energy density ina capacitor is directly proportioned to te} €,€, (b) my) @v 7. The expression for energy density is ‘Sqd-25 i AEG? E’Ad 16¢ 5 . om . a 5865 (b) eS aaa (4) U 3ee & if potential difference across two plates of a parallel plates capacitor is doubled then the energy stored in it will be: Sea-16 (a) 2-times @mmm(b) 4-times. {c) 8-times (d) Remain same 12.17 CHARGING AND DISCHARGING A CAPACITOR 1. The speed of the charging or discharging a capacitor depamds upon the product of resistance and (a) current (b) voltage (c) capacitance (a) potential difference 7 2 the product of ressitnace and capacitance is equal to G15, S04-15, D1, 18, Buh, Fad-7, Lend {a} Temprature —_(b) Permitivity = (0) Time (a) Current 3. FRC is small, then capacitor will be charged and discharged up 19, Mul 18, Opts (3) siowly (b] with medium speed um, (C) (d) and 4. Inthe time constant of RC circuit, how much charge is stored, oUt of maximum charge q,? (a) 037q, ()— Os1q, =m) 0.63, (0)0.90 a, 5. Sec/Ohmis equal to: 19, Rw? la) Farad (b)} Coulomb (Joule {d) Ampereb 10. > a b b b 12.9 ELECTRIC POTENTIAL c 2 b c 2 c u b n b b ota a b Fry b 12.10 ELECTRON VOLT _b cas 12.12 _CHARGE ON AN ELECTRON BY police 'S METHOD _ 12.13 CAPACITOR 1 b d a a GB d b a d 10. 12.14 CAPACITANCE OF A PARALLEL PLATE CAPACITOR 12.15 ELECTRIC POLARIZATION OF DIELECTRICS pene g 12.16 _ ENERGE STORED IN A CAPACITOR