MCQs Physics Part II

8/12/2019 MCQs Physics Part II

http://slidepdf.com/reader/full/mcqs-physics-part-ii 1/43

1. The temperature at which centigrade scale is equal to 0° is __________.

(-32°, -40°, 100°, -23°!

2. The a"erage #.$ o% a molecule o% a per%ect gas is __________.

(1&3#T, 3&2#T, 2&3#T!

3. The internal energ' in an isothermal process __________.

(ecreases, )ncreases, *ecomes +ero!

4. The electric intensit' at an' point *etween two oppositel' charged plain sheets is

__________.

(s&3o, s&o, s&2o, 2s&o!

. __________ o% the two charged particles o% the same mass will *e de%lected mostin a magnetic %ield.

(ast /o"ing, low mo"ing!

. To increase the accurac' o% a potentiometer __________ should *e used.

( uni%orm wire o% a large length should *e used, uni%orm wire o% a small length,on-uni%orm wire!

. $insteins Theor' o% 5elati"it' states that the speed o% light in "acuum is __________.

()ndependent o% the motion o% the source and the o*ser"er, a%%ected *' either dri%t,dependent on the motion o% the source and the o*ser"er!

6. )% a su*stance contracts on %ree+ing the increase o% pressure __________ the%ree+ing point.

()ncreases, ecreases, oes not 7hange!



8. thermo%las9 contains hot tea. )t is sha9en rapidl', i% the tea is considered asthe s'stem then its temperature will __________.

(5emains the same, 5ise, all!

10. )% the temperature o% the cold *od' is decreased the e%%icienc' o% a carnotengine __________.

(ecreases, )ncreases, 5emains constant!

11. The electric potential is +ero __________.

()nside a conductor, /idwa' *etween an' two charges o% the opposite signs, /idwa'

*etween two equal charges o% the sme sign!

12. :hen an electron mo"es in a magnetic %ield ;< with "elocit' ;= the %orce actingon it is perpendicular to __________

(= *ut not to <, *oth = and <, < *ut not =!

13. )% an electron and proton enter into a magnetic %ield with the same "elocit', theelectron shall e>perience a&an __________ %orce than the proton.

(?reater, @esser, $qual!

14. The wa"elength o% a material particle o% mass m mo"ing with the "elocit' " isgi"en *'A

(l B hn&m, lB h&m", l B m&hn!

1. gas e>erts pressure on the walls o% the containing "essel *ecause __________.

()t possesses momentum, the gas molecules collide with each other, the gas has %inite"olume!

1. The magnitude o% an electric %ield does not depend upon __________.

(The distance %rom the charged particle, nature o% the charges causing the %ield, the



magnitude o% the charges causing the %ield!

1. Two parallel *eams o% electrons mo"ing in the same direction will __________.

(5epel each other, ttract each other, either attract nor repel each other.

16. To increase the accurac' in a potentiometer circuit __________ should *e used.

( wire o% a small length, wire o% a large length, non uni%orm wire!

18.:hen %ast mo"ing electrons are stopped *' a metal o% high atomic weight thephenomenon gi"es rise to __________.

(C-ra's, *-ra's, g-ra's!

20. The pressure and "olume %ormula o% a gas undergoing and an dia*atic 7hange is __________.

(D= Bconstant, Dr= B constant, (D=!rB constant, D=r B constant!

21. %ree electron in an electric %ield __________.

(remains stationar', mo"es %rom the higher potential to the lower potential, mo"es%rom the lower potential to the higher potential!

22. n electron and a proton with the same momentum enter perpendicularl' into auni%orm magnetic %ield __________.

(<oth particles will de%lect equall', the proton will de%lect more than the electron,the electron will de%lect less than the proton!

23. $insteins photoelectric equation is written as __________.

(1&2 m"2ma> B hn E %o, hn B %o.- 1&2 m"2ma>, hn B 1&2 m"2ma> E %o, one o%these!

24. orce *etween two similar point charges separated *' a distance ;r is . )% thedistance is dou*led, %orce *ecomes __________.



(, 2, 4, &4!

2. /ean translational 9inetic energ' per molecule o% an ideal gas is gi"en *'

__________.

(3#T, 2&3#T, 3&2#T!

2. Drocess in which there is no heat e>change is called __________ Drocess.

()sothermal, )sochoric , dia*atic, )so*aric!

2. pectral series o*tained due to transition o% electron %rom higher to 3rd or*it is

called __________.

(@'man eries, <almer eries, <rac9ett eries, Daschen eries!

26. *atter' o% e.m.% "olts has internal resistance r ohm, current ) is drawn %romit its terminal "oltage = will *e __________.

(= B $ F )r, = B $&r, = B )r, = B $&)!

28. $lectric intensit' o% a gi"en charge at an' point is __________ distance %romcharge.

(irectl' proportional to, )n"ersel' proportional to square o%, irectl' proportional tosquare o%, )n"ersel' proportional to square o% !

30. Two resistors o% 2: and 3: are connected in series with a *atter' o% 10 "olts.Dotential di%%erence across 2: resistor will *e __________.

( "olt, 4 "olt, "olt, 10 "olts!

31. sla* o% certain dielectric is placed *etween two oppositel' charge plates. Theintensit' *etween plates __________.

(ecreases, )ncreases, 5emains constant!



32. orce on a charged particle mo"ing in a magnetic %ield is gi"en *' the equation B q"*sinq. Guantities mutuall' perpendicular are __________.

(= and <, and ", and <, one!

7hapter 1

Heatriendsmania.net1. The energ' that %lows %rom a high temperature o*Iect to a low temperatureo*Iect is called __________.

(Heat, ound $lectricit', olar $nerg'!

2. Hotness or coldness o% an o*Iect is e>pressed in tems o% a quantit' called __________.

(Heat, Temperature, #el"in, one o% these!

3. The ) unit o% heat is __________.

(7alorie, Joule, $lectron =olt, one o% these!

4. The energ' e>pended when a %orce o% one ewton mo"es an o*Iect one metre inthe direction in which the %orce is applied is called __________.

(7alorie, Joule, 9wh, $lectron =olt!

. 1JB__________.

(1m, 19gms2, 19gm-2,19gm2s-1!

. 1J B __________.

(9gms, 1 9gms2, 19gm2s-2, 19gm2s-1!

. The a"erage 9inetic energ' o% the molecules o% the o*Iect is called its __________.



(Heat, Temperature, Hotness, 7oldness!

6. __________ is a de"ice used to measure the degree o% hotness or coldness o% the

o*Iect.

(Thermometer, <arometer, H'psometer, one o% these!

8. ?enerall' thermometers ma9e use o% the %act that most o% the liquids __________ on heating.

(7ompress, $>pand, $"aporate, u*limi+e!

10. Kn 7elsius scale *oiling point o% water is ta9en as __________.

(0°7, 100°7, 160°7, one o% these!

11. Kn 7elsius scale %ree+ing point o% water is ta9en as __________.

(0°7, 100°7, 160°, one o% these!

12. 1°7 B __________.

L&8 (° F 32!, &8 (° E 32!, &8 (° F 23!, &8 (° E 23!M

13. 1° B __________.

L&8 (°7 F 32!, &8 (° E 32!, 8& (°7 E 32!, one o% theseM

14. # B __________.

(23 E °7, 23 - °7, 23 E °, 23 - °!

1. 1 cal B __________.

(11.164J, 2.164J, 3.164J, 4.164J!

1. __________ proposed that matter and energ' are equi"alent.



(ewton, $instein, /a>well, ll the these!

1. The equation representing the intercon"ersion o% matter and energ' is written as

__________.

($ B mc, $ B mc2, $ B mc3, ll o% these!

16. 7on"ersion o% one gram o% matter to energ' 'ields __________ Ioules o% energ'.

(8 > 1013J, 8 > 1012J, 8 > 1011J, 8 > 1010J!

18. The amount o% heat required to raise the temperature o% 2.0 > 1069g o% water

%rom 0°7 to 100°7 is equal to __________.

(8 > 1013J, 8 > 1012J, 8 > 1011J, 8 > 1010J!

20. uring the com*ustion o% 3 > 10 9g o% coal __________ o% matter is con"ertedinto energ'.

(1g, 19g, 1mg, one o% these!

21. The temperature at which the gases i% the' remain in gaseous state e>ert +eropressure and ha"e +ero "olume is called __________.

(1°7, 1°, 1#, *solute Nero!

22. The sum total o% all the energ' o% all the molecules o% atoms in an o*Iect is9nown as __________.

(Temperature, $ntrop', )nternal $nerg', one o% these!

23. Knce the heat is trans%erred to an o*Iect, it is con"erted into the __________.

($ntrop' o% the o*Iect, )nternal energ' o% the o*Iect, Temperature o% the o*Iect,one o% these!

24. OTemperature remaining constant the "olume o% gi"en mass o% a gas is in"ersel'



proportional to the pressure applied on it.P )t is called __________.

(?eneral ?as @aw, <o'les @aw, 7harles @aw, one o% these!

2. Ot constant pressure the "olume o% a gas is proportional to the a*solutetemperature.P )t is called __________.

((?eneral ?as @aw, <o'les @aw, 7harles @aw, one o% these!

7hapter 12

$lectrostatics

1. /atter is composed o% three %undamental particles. The' are __________.

(a. $lectrons, Drotons, eutrons *. $lectrons, 7athode ra's, masons c. $lectrons,neutrons, masons!

2. __________ is a negati"el' charged particle and is %ound around the nucleus o% anatom.

($lectron, Droton, eutron, one o% these!

3. __________ is a positi"el' charged particle and is %ound in the nucleus o% anatom.


4. __________ is a neutral particle and is %ound in the nucleus o% an atom.


. :hen one or more than one electrons are remo"ed %rom an atom it *ecomes __________.

(eutral particle, egati"el' charged particle, positi"el' charged particle, none o%these!



. ll material o*Iects are composed o% __________.

(($lectron, Droton, eutron, atoms!

. tom is a __________.

(7harged particle, egati"el' charged particle, Dositi"el' charged particle, one o%these!

6. )% electrons are added in an atom it *ecomes __________.

(eutral particle, egati"el' charged particle, positi"el' charged particle, none o%these!

8. Those material o*Iects which do not allow the charge or electric current to passthrough them are called __________.

()nsulators, 7onductors, emi-conductors, none o% these!

10. Those material o*Iects which allow charge or electric current to pass throughthem are called __________.

()nsulators, 7onductors, emi-conductors, none o% these!

11. @i9e charges __________.

(ttract each other, 5epel $ach other, either attract nor repel each other, oneo% these!

12. Qnli9e charges __________.

(ttract each other, 5epel $ach other, either attract nor repel each other, oneo% these!

13. )% the ph'sical si+e o% a charge particle is "er' small, compared to theseparation distance *etween them, it is called __________.

(Nero charge, Doint charge, Dositi"e charge, egati"e charge!



14. OThe magnitude o% the electrostatic %orce *etween two point charges is directl'proportional to the product o% the magnitude o% the charges and in"ersel' proportionalto the square o% the distance *etween them.P )t is called __________.

(arada's law, 7oulom*s @aw, ewtons @aw, ?uasss law!

1. o is called __________.

(cceleration due to gra"it', ?ra"itational constant, pring constant, Dermiti"it' o%%ree space!

1. )% the quantit' o% charge on each o% the two *odies is dou*led, the %orce

*etween them *ecomes __________.

(Twice, our times, ine times, i>teen times!

1. __________ is a "ector quantit'.

($lectric %ield, $lectric ield )ntensit', $lectric charge, $lectric current!

16. )n ) units electric %ield intensit' is measured in __________.

(s, &7, &J, &m!

18. The concepts o% electric %ield lines was introduced *' a %amous scientist __________

(ewton, arada', $instein, 7oulom*!

20. The electric %ield lines, alwa's start %rom a __________.

(Dositi"e charge, egati"e charge, Doint charge, one o% these!

21. The electric %ield lines, alwa's end at a __________.

(Dositi"e charge, egati"e charge, Doint charge, one o% these!



22. The tangent to the %ield line at an' point gi"es the direction o% the __________.

(electric %ield intensit' at that point, electric %ield at that point, $lectrostatic %orce

at that point, $lectrostatic %orce at that point, one o% these!

23. The wor9 done in *ringing a unit positi"e charge %rom in%init' to certain point,9eeping the unit charge is equili*rium is called __________.

(Dotential energ', Dotential gradient, $lectric potential, $lectric %ield intensit'!

24. )n ) units electric potential is measured in __________.

(7oulom*s, mperes, =olts, &72!

7hapter 13

7urrent $lectricit'

1. The net charge %lowing across the sectional area per unit time is 9nown as __________.

($lectric 7urrent, mpere, $lectric %low, none o% these!

2. The direction o% electric current is that in which __________.

(egati"e charge will dri%t, Dositi"e charge will dri%t, <oth positi"e and negati"echarge will dri%t, one o% these!

3. /athematicall' $lectric current ) in a conductor is de%ined *' the relation __________.

() B Gt, G B )&t, ) B G&t, one o% these!

4. The ) unit o% current is __________.

(mpere, 7oulom*, "olt, one o% these!



. 1 B __________.

(17&s, 17&s2, 1J&s, 1&s!

. O)n a electrical circuit, the potential di%%erence across a conductor is directl'proportional to the current %lowing through it, pro"ided the temperature o% theconductor remains the same.P This is called __________.

(Khms @aw, 7oulom*s @aw, ?uasss @aw, one o% these!

. /athematicall' Khms @aw is written as __________.

(= B )5 = B )&5, = B Gt, one o% the a*o"e!

6. /easure o% the opposition to the %low the %ree electron is 9nown as __________.

(7urrent, 5esistance, 7onductance, 7apacitance!

8. The ) unit o% electrical resistance is __________.

(mpere, =olt, arad, Khm!

10. )% the potential di%%erence o% 1 "olt is applied across the end o% a conductor andthe resulting current %lowing through the conductor is one ampere then the resistanceo% the conductor is said to *e __________.

(1ohm, 1ampere, 1%arad, 1"olt!

11. 1: (ohm! B __________.

(1=, 1=&, 17&, 1J&2!

12. )t is e>perimentall' o*ser"ed that in general the resistance 5 o% a gi"en wireincreases with increase in __________.

(Temperature, 7ross-section area o% a wire, @ength o% a wire, none o% these!

13. )t is e>perimentall' o*ser"ed that in general the resistance 5 o% a gi"en wire



decreases with increase in __________.

(Temperature, 7ross-section rea, @ength o% a wire, one o% the a*o"e!

14. The change in resisti"it' per unit original resisti"it' (or resistance! per degreechange in temperature is called __________.

(5esistance, 7onductance, Temperature coe%%icient o% resisti"it', ll o% these!

1. The resisti"it' o% a class o% elements o% some critical temperature T, %alls to+ero. The materials showing such propert' are called __________.

(emi-conductors, uper-conductors, )nsulators, 7onductors!

1. The de"ice which can maintain a potential di%%erence *etween two points to whichthe' are attached are 9nown as __________.

(r' cell, sources o% power, sources o% electromoti"e %orce, sources o% heatdissipated!

1. The unit o% electromoti"e %orce is __________.

(=olt, mpere, watt, Joule!

16. <atteries or cells con"ert __________.

(Heat energ' into electrical energ', nuclear energ' into electrical energ', 9ineticenerg' into electrical energ', chemical energ' into electrical energ'!

18. $lectrical generators con"ert __________.

(chemical energ' into electrical energ', 9inetic energ' into electrical energ',mechanical energ' into electrical energ', light energ' into electrical energ'!

20. Thermocouples con"ert __________.

(chemical energ' into electrical energ', heat energ' into electrical energ', mechanicalenerg' into electrical energ', light energ' into electrical energ'!



21. Dhoto "oltaic cell con"erts __________.

(chemical energ' into electrical energ', heat energ' into electrical energ', mechanical

energ' into electrical energ', light energ' into electrical energ'!

22. )n practice, the sources o% em% alwa's ha"e __________.

(Nero resistance, unit resistance, some resistance, in%inite resistance!

23. The em% o% a source is equal to the potential di%%erence across the terminals o%the source when either its internal resistance is __________.

(Nero, )n%inite, Nero or in%inite, one o% these!

24. The electromoti"e %orce is written as __________.

($ B :&q, $ B :q, $ B G&), one o% these!

7hapter 14

/agnetism and $lectromagnetism

1. /agnetism deri"es its name %rom __________, a region in sia /inor (/odernTur9e'! where it was %ound in %or %orm o% certain iron core.

(/agnesia, /agnesium, $lectromagnetism, one o% these!

2. __________ is not a magnetic material.

()ron, ic9er, 7o*alt, sil"er!

3. *od' that attracts small pieces o% iron and points towards north-south directionwhen suspended %reel', is called a __________.

(/agnet, 7onductor, /agnetism, one o% these!

4. @i9e poles o% two magnets __________.



(ttract, 5epel, either attract nor repel, one o% these!

. Qnli9e poles o% two magnets __________.

ttract, 5epel, either attract nor repel, one o% these!

. The magnetism o% the magnet is concentrated in the __________.

(orth pole, outh pole, orth and outh pole, t the middle!

. )% a magnet is *ro9en into two pieces, then __________.

(Two magnets are o*tained, oth pole is o*tained, outh pole is o*tained, Kne northpole and one south pole is o*tained!

6. The space surrounding a magnet in which its magnetic e%%ect is %elt is called __________.

(orth pole, south pole, /iddle Doint, /agnetic ield!

8. The intensit' o% the magnetic %ield near its poles is __________.

(Nero, /a>imum, /inimum, one o% these!

10. )% the magnetic %ield is uni%orm, then the magnetic lines o% %orces are __________.

(7ur"ed, Darallel, Derpendicular, one o% these!

11. The magnetic %ield is represented with __________.

(/agnetic lines o% %orces, /agnetic induction, orth pole, outh pole!

12. The path along which an isolated north ple o% a magnet mo"es in the magnetic%ield is called __________.

(/agnetic %ield, /agnetic %ield lines, orth pole, outh pole!



13. Two magnetic lines o% %orce __________.

(can intersect each other, do not intersect each other, can repel each other, can

attract each other!

14. __________ *eha"e li9e a stretched ru**er string which tends to contractlongitudinall' and e>pand laterall'.

(/agnets, /agnetic orce, $lectric @ines o% %orce, /agnetic lines o% %orce!

1. The magnetic lines o% %orce pass through __________, as compared to air.

(:ater, )ron, 5u**er, one o% the a*o"e!

1. su*stance which *eha"es li9e a magnet in the presence o% a strong %ield iscalled __________.

(/agnets, erromagnets, $lectromagnets, one o% these!

1. magnet can *e demagneti+ed *' __________.

(Heating, <' dropping it se"eral time, *rea9ing into two pieces, *oth heating and *'dropping it se"eral time!

16. The %ield magnet around a mo"ing charge is called __________.

($lectric ield, /agnetic ield, ?ra"itational ield, one o% the a*o"e!

18. The direction o% magnetic lines o% %orce is gi"en *' the __________.

(head to tail rule, right hand rule, le%t hand rule, none o% these!

20. __________ was the %irst to note the presence o% magnetic %orce in a wire inwhich currents are %lowing.

(ewton, mpere, Kersted, one o% these!



21. )% two wires in which currents are %lowing in the same direction are placedparallel and close to each other then the' will __________.

(5epel each other, ttract each other, either attract nor repel each other, one

o% the a*o"e!

22. )% two wires in which currents are %lowing in the opposite direction are placedparallel and close to each other then the' will __________.

(5epel each other, ttract each other, either attract nor repel each other, oneo% the a*o"e!

23. The charge mo"ing parallel to the magnetic %ield ;< with a certain "elocit' ;"

e>periences __________.

(o %orce, /a>imum %orce, /inimum orce, one o% these!

24. The charge mo"ing perpendicular to the magnetic %ield ;< with a certain "elocit';" e>periences __________.

(o %orce, /a>imum %orce, /inimum orce, one o% these!

2. The magnetic %orce m acting on charge ;q when it mo"es with a "elocit' ;"through a magnetic %ield ;< is gi"en *' __________.

(m B q" > <, m B q"2 > <, m B q$, one o% these!

2. The magnitude o% a magnetic %orce ; acting on charge ;q when it mo"es with a"elocit' ;" through a magnetic %ield ;< is gi"en *' __________.

( B q"<sinq, B q"2<sinq, "<sinq, one o% these!

2. )n a magnetic %ield the charge at rest e>periences __________.

(o %orce, /a>imum %orce, /inimum %orce, one o% these!

26. The charge, which mo"es along a line parallel to the direction o% magnetic lines o%%orce, e>periences __________.



(o %orce, /a>imum %orce, /inimum %orce, one o% these!

28. /a>imum %orce is e>perienced *' a charged particle when it mo"es __________.

(Darallel to magnetic %ield, with +ero "elocit', none o% these!

30. The ) unit o% magnetic induction < is __________.

(=olt, watt, %arad, tesla!

31. :hen an alternating accelerating %ield is applied to a charge it produces __________.

(ound wa"es, $lectromagnetic wa"es, C-ra's, ?amma ra's!

32. The wa"e which require no medium %or the propagation are 9nown as __________.

(ound wa"es, /echanical wa"es, $lectromagnetic wa"es, one o% these!

33. n electromagnetic wa"e electric and magnetic %ields are __________.

(Darallel to each other, Derpendicular to each other,Kpposite to each other, one o%these!

34. The "elocit' o% electromagnetic wa"es depend upon __________.

(/agnetic permea*ilit', $lectricpermiti"it', <oth magnetic permea*ilit' and electricpermiti"it', one o% these!

3. u*stances ha"ing electrical resisti"it' intermediate *etween conductors andinsulators are called __________.

(uperconductors, emiconductors, n-t'pe conductors, p-t'pe conductors!

3. )n emiconductors __________ are responsi*le %or electrical conduction.



(Drotons, $lectrons, Holes, $lectrons, holes!

3. :hen a penta"alent material li9e s, is added to tetra"elent material i.e. ?e weget a __________.

(n-t'pe material, p-t'pe material, emiconductors, one o% these!

36. )n n-t'pe materials __________.

(Holes are maIorit' carriers, $lectrons are maIorit' carriers, $lectrons are minorit'carriers, one o% these!

38. :hen a tri"alent material li9e )ndium or ?alium is added to ?e, we get a

__________.

(n-t'pe material, p-t'pe material, semiconductor, one o% these!

40. )n p-t'pe materials __________.

(Holes are maIorit' carriers, $lectrons are maIorit' carriers, $lectrons are minorit'carriers, one o% these!

41. =elocit' o% light is __________.

(3 > 106 m&s, 3 > 10 m&s, 3 > 10 cm&s, one o% these!

42. The electromagnetic wa"es emitted *' the ).7 circuit o% aerial o% a transmittingstation are o% __________.

(Nero amplitude, Qnit amplitude, 7onstant amplitude, =aria*le amplitude!

43. The electromagnetic wa"es emitted *' the ).7 circuit o% aerial o% a transmittingstation ha"e %requenc' o% the range __________.

(102H+, 104H+, 10H+, 106H+!

44. cr'stal diode is used %or recti%ication o% __________.



(7 current, 7 current, $lectromagnetic wa"es, one o% the a*o"e!

4. geometric shape o% a solid o*tained *' regular, repetiti"e, three-dimensionalarrangements o% its molecules, atoms or ions is called a __________.

(7r'stal, @attice, 7r'stal plane, one o% these!

4. Two su*stances ha"ing the same cr'stal structure are called __________.

()somorphous u*stance, llotropic su*stances, True su*stances, Dol'morphoussu*stances!

4. The su*stance, which e>ists in two or more cr'stal %orms under di%%erent

condiion is called __________.

()somorphous u*stance, llotropic su*stances, True su*stances, Dol'morphoussu*stances!

46. regular, repetiti"e, three-dimensional pattern o% points, which represent theposition o% molecules, atoms or ions in the cr'stal, is called __________.

(Qnit cell, pace lattice, cr'stal, true su*stance!

48. The smallest portion o% a cr'stal lattice that i% repeated in three-dimensions willgenerate the entire lattice is called __________.

(Qnit cell, @attice plane, cr'stal, none o% these!

0. :hen a cr'stal is su*Iected to stress, it tends to *rea9 or %racture alongde%inite direction which is characteristic o% a sample. This is called __________.

(7lea"age, llotrop', nisotrop', Homeogeneit'!

1. The propert' due to which the si+e or shape o% a lattice is not important iscalled __________.

(7lea"age, nisotrop', Homogeneit', one o% these!



2. )n a cr'stal the densit' o% atoms or molecules does not "ar' %rom direction todirection. This is 9nown as __________.

(7lea"age, nisotrop', Homogeneit', one o% these!

3. )% one atom or molecule lies out each o% the eight corners o% a cu*e, it is called __________.

(simple cu*e, %ace centred cu*e, *od' centred cu*e, none o% these!

4. __________ is a cu*ic pattern ha"ing one e>tra atom or molecule at the centreo% each o% the si> %aces o% the cu*e.


. __________ is a pattern which has got one more atom at the centre o% a simplecu*e.


. The electrons, which can wander in the solid, are 9nown as __________.

(=alence electron, %ree electron, loosel' *ound electrons, none o% these!

. __________ o% the %ollowing theories could not e>plain completel' the *eha"iouro% conductors, insulators, and semiconductors.

(energ' *and theor', %ree electron theor', "alence electron theor', none o% these!

6. The electrons in a solid cr'stal are supposed to ha"e di%%erent energ' le"elswhich can *e %ound *' the solution o% __________.

(/a>wells equation, chrodingers wa"e equation, ?as equation, none o% these!

8. The solution o% chrodingers wa"e equation shows that the electrons can e>ist insome ranges o% energ' called __________.

(Dermissi*le energ' le"els, energ' *ands, conduction *and, %or*idden energ' le"els!



0. The permissi*le energ' le"els ta9en in gourps are called __________.

(Dermissi*le energ' le"es, energ' *ands, conduction *ands, %or*idden energ' le"els!

1. The materials in which "alence *and and conduction *and o"erlaps are called __________.

()nsulators, 7onductors, emiconductors, uperconductors!

2. The material in which the highest occupied energ' le"el is completel' %illed iscalled __________.

()nsulator, conductor, semiconductor, superconductor!

3. The material in which the gap *etween the %illed energ' *and and ne>t higherpermitted energ' *and is small, is called __________.

()nsulator, 7onductor, semiconductor, superconductor!

4. The su*stances with resisti"it' o% order o% 10-4 ohm-metre are called __________.

()nsulators, semiconductors, conductors, good conductors!

. The su*stances with resisti"it' o% the order o% 10-6 ohm-metre are called __________.

()nsulators, semiconductors, conductors, good conductors!

. t temperature near a*solute +ero, a pure semiconductor *eha"es li9e

__________.

(an insulator, a conductor, a superconductor, none o% these!

. Iunction *etween p-t'pe material and n-t'pe material is called as __________.



(diode, recti%ier, transistor, ampli%ier!

6. The semi-conductor diode has the propert' o% __________.

(one wa' conduction, two wa' conduction, +ero conduction, none o% these!

8. diode can *e used as __________.

(oscillator, recti%ier, transistor, ampli%ier!

0. )% p-t'pe material o% the pn-Iunction is connected with positi"e terminal o% the*atter' and n-t'pe material with negati"e terminal o% the *atter', it is said to *e __________.

(%orward *iased, re"ersed *iased, +ero *iased, none o% these!

1. )% p-t'pe material o% the pn-Iunction is connected with negati"e terminal o% the*atter' and n-t'pe material with positi"e terminal o% the *atter', it is said to *e __________.

(%orward *iased, re"ersed *iased, +ero *iased, none o% these!

2. de"ice, which con"erts an alternating current to a direct current, is called __________.

(Kscillator, recti%ier, ampli%ier, p-t'pe material!

3. thin la'er o% one t'pe o% semiconductor material sandwiched *etween tworelati"el' thic9 pieces o% other t'pe is termed as __________.

(iode, recti%ier, transistor, oscillator!

4. transistor consists o% __________.

(one pn-Iunction, two pn-Iunctions, three pn-Iunctions, one o% these!

. or normal transistor operation, $-< Iunction is alwa's __________.



(re"ersed *iased, %orward *iased, +ero *iased, ll o% these!

. transistor can *e used as __________.

(diode, recti%ier, ampli%ier, all o% these!

. The transistor is also used as __________.

(diode, switching de"ice, recti%ier, p-t'pe material!

6. )% we use two diodes and a centre tapped trans%ormer, we will get __________.

(hal% wa"e recti%ication, %ull wa"e recti%ication, 7 current, all o% these!

8. %orward *iased p-n semiconductor diode is called __________.

(@.$., Dhotodiode, Dhoto"oltaic cell, transistor!

60. __________ is generall' a re"ersed *iased p-n Iunction in which light is allowedto %all on the p-la'er through a window pro"ided %or this purpose.

(@.$., photodiode, photo"oltaic cell, transistor!

61. Transistors has replaced __________.

(diodes, "acuum tu*es, recti%iers, photo"oltaic cell!

7hapter 1

tomic pectra

1. The radiation emitted %rom h'drogen %illed discharge tu*e, when "iewed *'dispersing de"ices such as prism, gratings etc, shows __________.

( line spectrum, 7ontinuous spectrum, @inear spectrum, all o% these!

2. :hen an electron Iumps %rom higher to lower or*it, then __________.



($nerg' is a*sor*ed, $nerg' is emitted, neither a*sor*ed nor emitted, none o% these!

3. :hen electron in h'drogen atom Iumps %rom higher or*it into %irst or*it. The seto% lines emitted is called __________.

(<almer eries, @'man eries, <rac9et eries, Daschen eries!

4. :hen an electron in h'drogen atom Iumps %rom higher or*it into second or*it. Theset o% lines emitted is called __________.


. :hen an electron in h'drogen atom Iumps %rom higher or*it into third or*it. The

set o% lines emitted is called __________.


. :hen an electron in h'drogen atom Iumps %rom higher or*it into %ourth or*it. Theset o% lines emitted is called __________.


. :hen an electron in h'drogen atom Iumps %rom higher or*it into %i%th or*it. Theset o% lines emitted is called __________.

(<almer eries, @'man eries, D%und eries, Daschen eries!

6. __________ o% the %ollowing series in the spectrum o% the h'drogen lies in the"isi*le region o% the electromagnetic spectrum.

(Daschen eries, <almer eries, @'man eries, <rac9ett s$ries!

8. __________ o% the %ollowing is not a %undamental postulate o% <ohrs theor' o%h'drogen atom.

(The classical theor' does not appl' in the case o% tin' particles such as electrons,The electron in a sta*le or*itdoes not radiate energ', The electron can mo"e in allpossi*le or*its, n atom radiates energ' onl' when an electron Iumps %rom an allowed



or*it o% higher energ' $n to one o% the lower energ $p!

10. __________ o% the %ollowing is not a %undamental postulate o% <ohrs theor' o%h'drogen atom.

(The total energ' o% the electron in one o% it allowed or*it remains constant as longas it remains in the same or*it, n electron can not re"ol"e in an ar*itrar' or*it.Knl' those or*its are possi*le %or which the angular momentum o% the electron a*outthe nucleus is an integral multiple o% h&2p, The electron can mo"e in all possi*leor*its, n atom radiates energ' onl' when an electron Iumps %rom an allowed or*it o%higher energ' $n to one o% the lower energ' $p!

11. ccording to <ohrs theor' o% h'drogen atom, an electron can re"ol"e around a

proton inde%initel' i% its path is __________.

(a per%ect circle o% an' radius, a circle o% constantl' decreasing radius, a circle o% anallowed radius, an ellipse!

12. )n a h'drogen atom the radius o% the electron or*it is go"erned *' <ohrsquantum rule which states that __________.

(the linear momentum o% the electron is quantised, the angular momentum o% the

electron is quantised, the linear "elocit' o% the electron is quantised, the angular"elocit' o% the electron is quantised!

13. ccording to <ohrs theor' o% the h'drogen atom, the total energ' o% theh'drogen atom with its electron re"ol"ing in the nth stationar' or*it is __________.

(proportional to n, proportional to n2, in"ersel' proportional to n, in"ersel'proportional to n2!

14. The energ' o% the electron o% h'drogen or*iting in a stationar' or*it o% radius rnis proportional to __________.

(rn, 1&rn, rn2, 1&rn2!

1. :hen an electron Iumps %rom the nth (higher or*it! or*it to the pth or*it (lower



or*it!, the di%%erence o% energ' is gi"en *' the equation __________.

(hR B $n F $p, hR B $n E $p, hR B $, hR B @p!

1. The %requenc' R o% electromagnetic radiation is gi"en *' the equation __________.

(R B lc, R B 1&l, R B c&l, one o% these!

1. The transitions o% inner- shell electrons in hea"' atoms gi"e rise to __________.

16. C-ra's are a part o% electromagnetic spectrum and are characteri+ed *'%requencies higher than those o% __________.

("isi*le radiation, in%rared radiation, ultra "iolet radiations, none o% these!

18. Droduction o% continuous C-ra's is due to the __________.

(cceleration o% incident electrons *' the nucleus o% the target atom, electrontransitions *etween inner-shells o% the target atom, electron transitions *etweenouter shells o% the target atom, annihilation o% the mass o% incident electrons!

20. C-ra's are __________.

(Dositi"el' charged particles, egati"el' charged particles, eutral particles, one o%these!

21. The stud' o% the spectrum o% characteristic C-ra's helps us to __________.

(/easure the energ' o% the incident electrons, measure the wa"elength o% theincident electrons, measure the energ' o% the emitted >-ra's, identi%' the element

o% which the target is made!

22. The ma>imum %requenc' limit o% the continuous >-ra's spectrum depends upon __________.

(the atomic num*er o% the atoms o% the target, the 9inetic energ' o% the incidentelectrons, the ma>imum %requenc' limit o% the characteristic >-ra's spectrum, the



degree o% "acuum in the >-ra' tu*e!

23. The de"ice that produces an intense, monochromatic and coherent *eam o% light*ased on stimulated emission o% photons %rom atoms, is called __________.

(@aser, >-ra' tu*e, discharge tu*e, c'clotron!

24. n interesting application o% laser is the production o% three-dimensional imagescalled __________.

(Dol'gons, Holograms, K"als, one o% these!

2. )n solid lasers, a %luorescent cr'stal, such as that o% __________ is used as

light ampli%'ing su*stance.

(5u*', ?lass, semiconductor, all o% these!

2. The liquid lasers usuall' ma9e use o% a d'e dissol"ed in __________ as a lightampli%'ing su*stance.

(<en+ene, 7itric acid, methanol, alcohol!

2. The laser de"ice used to %ragment gallstones and 9idne' stones is called __________.

(@aser *eam, @aser scanner, laser lithotropter, ru*' laser!

26. :hen %ast mo"ing electrons stri9e a metal target inside a partiall' e"acuatedtu*e, then __________ are produced.

(cathode ra's are produced, cosmic ra's are produced, >-ra's are produced, alpha

ra's are produced!

28. Droduct o% >-ra's is a re"erse phenomenon o% __________.

(Dhotoelectric e%%ect, 7ompton e%%ect, Dair production, nnihilation o% matter!

30. __________ is a wrong statement in the %ollowing.



(>-ra's are not re%racted as the' pass %rom one medium to another, li9e "isi*le light,>-ra's are di%%racted at an o*stacle, >-ra's can cause ioni+ation o% the atoms o% aliquid, >-ra's are de%lected *' electric and magnetic %ields!

31. >-ra's were disco"ered *' __________.

(/adam 7urie, 5ontgen, 7oolidge, @aue!

32. C-ra's are produced when an element o% high atomic weight is *om*arded *' highenerg' __________.

(Drotons, $lectrons, eutrons, Dhotons!

33. __________ o% the %ollowing parameters o% the emitted >-ra's increases whenthe potential di%%erence *etween the electrodes o% an >-ra' tu*e is increased.

()ntensit', requenc', :a"elength, peed!

7hapter 1

The uclear Dh'sics

1. tom consists o% __________.

($lectrons, Drotons, eutrons, ll o% these!

2. tom as a whole __________.

(Dositi"el' charged particle, negati"el' charged particle, neutral particle, none o%these!

3. __________ disco"ered electron.

(5.. /ili9an, J.J. Thomson, 7roo9s, $instein!

4. <ased on the concepts o% modern ph'sics, atoms o% the 9nown elements possessesa structure consisting o% a central core o% the tom called __________.



(proton, nucleons, nucleus, radius!

. 5uther%ords e>periment on the scattering o% alpha particles *' thin %oils

esta*lishes the e>istence o% __________.

(a negati"el' charged nucleus, a positi"el' charged nucleus, neutrons in the nucleus,e"en distri*ution o% charge in the atom!

. ucleus contains __________.

(electrons and protons, protons and neutrons, electrons and neutrons!

. eutron was disco"ered *' __________.

(7roo9s, J.J Thomson, 7hadwic9, none o% these!

6. The total num*er o% nucleons in the nucleus is called __________.

(tomic num*er, /ass num*er, /ole, ?ram mole!

8. The total num*er o% electron around the nucleus or total num*er o% protons in thenucleus is called __________.

(tomic num*er, /ass num*er, "ogadros num*er, ?ram mole!

10. uclei o% di%%erent elements are identi%ied *' their __________.

(tomic num*er, /ass num*er, "ogadros num*er, ?ram mole!

11. .: ston de"eloped on instrument, which uses electric and magnetic %ields tosort out atoms according to their masses. This instrument is called __________.

(7'clotron, <etatron, /ass pectrometer, <arometer!

12. uclei o% the same element ha"ing the same N *ut di%%erent "alues o% arecalled __________.



()sotopes, )so*ars, )somers, llotropes!

13. uclei o% di%%erent elements with the same num*er are called __________.

()sotopes, )so*ars, )somers, llotropes!

14. H'drogen has __________.

(Kne isotope, two isotopes, three isotopes, %our isotopes!

1. The nucleus o% h'drogen with s'm*ol 1H1 is called __________.

(Droton, eutron, Triton, all o% these!





16. The process o% separation o% 82Q23 %rom natural uranium is called __________.

($nrichment, eparation, nnhilation, usion!

18. uclear %orces are __________.

(short range %orces, long range %orces, independent o% distances, none o% these!

20. The amount o% energ' required to *rea9 the nucleus into its constituent particlesis called __________.

(/ass de%ecit, *inding energ', ioni+ation energ', ioni+ation potential!

21. The emission o% ra's %rom the nucleus is called __________.



(nnhilation o% matter, isintegration o% atoms, 5adioacti"it', ission!

22. tomic num*er with atomic num*er NS62 are __________.

(sta*le, unsta*le, small, none o% these!

23. __________ is not a radioacti"e element.

(Dolonium, 5adium, Qranium, H'drogen!

24. 5adioacti"e elements emit __________.

(a-ra's, *-ra's, g-ra's, all o% these!

2. The mass o% each a-particle is nearl' __________.

(twice times the mass o% h'drogen atom, three times the mass o% h'drogen atom,%our times the mass o% h'drogen atom, %i"e times the mass o% h'drogen atom!

2. a-particle is __________.

(Dositi"el' charge, negati"el' charge, neutral, one o% these!

2. 7harge on each a-particle is equal to __________.

(the 7harge on proton, twice the charge on proton, three times the charge on proton,%our times the charge on proton!

26. __________ o% the %ollowing particles has "er' high ioni+ation capa*ilit'.

(a-particle, *-particle, g-particle, all o% these!

28. __________ o% the %ollowing particles has "er' low penetration power.


30. __________ o% the %ollowing particle can induce arti%icial rdioacti"it' in certainnuclei.




31. C-ra's are %ound to *e in __________.

(electromagnetic wa"es, electrons, %astl' mo"ing helium nucleus, %astl' mo"ingneutron!

32. __________ o% the %ollowing particles consists o% %ast mo"ing electrons.


33. __________ o% the %ollowing particles has less 9inetic energ'.


34. __________ o% the %ollowing particles mo"e with "elocit' o% light.


3. C-5a's are __________.

(Dositi"el' charged, negati"el' charged, neutral, none o% these!

3. __________ ra's or particles are not de%lected *' electric and magnetic %ield.


3. :hen g-ra's are *om*arded on metals, the' emit __________.

(Drotons %rom the metal sur%ace, neutrons %rom the metal sur%ace, electrons %romthe metal sur%ace, all o% these!

36. The penetrating power o% g-ra's is a*out hundred times larger than that o% __________.

(Dhotons, a-ra's, *-ra's, electrons!



38. g-ra's are electromagnetic radiations similar to __________.

(radiowa"es, photons, >-ra's, *-ra's!

40. Qnsta*le isotopes are called __________.

()so*ars, isomers, radioacti"e isotopes, none o% these!

41. )sotopes di%%er onl' in the num*er o% __________.

(electrons, protons, neutrons, none o% these!

42. :hen a nucleus wmits an alpha radiation&particles its atomic num*er drops *'

__________.

(1, 2, 3, 4!

43. :hen a nucleus emits an alpha radiation&particles its nucleon num*er drops *' __________.

(1, 2, 3, 4!

44. :hen an element emits *-particles, its mass num*ers __________.

(increases *' 1, decreases *' 1, remains same, *ecomes +ero!

4. :hen an element C emits gamma-ra's, its atomic num*er N __________.

()ncreases *' 1, decreases *' 1, remains same, none o% these!

4. :hen an element C emits gamma ra's, its mass num*er __________.

(increases *' 1, decreases *' 1, remains sme, none o% these!

4. Kut o% the %ollowing __________ is not emitted *' a radioacti"e su*stance.

(electrons, electromagnetic radiations, helium nuclei with a charge equal to that o%two protons, neutrons!



46. The time required %or the element to deca' to one hal% o% its original num*er iscalled __________.

(Transmutation, hal%-li%e, nuclear deca', none o% these!

48. )t has *een o*ser"ed that, on the a"erage, the actual num*er o% atoms whichdeca' at an' instant is __________.

(in"ersel' proportional to the num*er o% atoms present, directl' proportional to thenum*er o% atoms present, in"ersel' proportional to the square o% the total num*er o%atoms present, in"ersl' proportional to the square root o% the total num*er o% atomspresent!

0. The hal% li%e o% a radioacti"e su*stance is 10da's. This means that __________.

(the su*stance completel' disintegates in 20 da's, the su*stance completel'disintegrates in 40da's, 1&6 part o% the mass o% the su*stance will *e le%t intact atthe end o% 40 da's, &6 part o% the mass o% the su*stance disintegrates in 30 da's!

1. The hal%-li%e o% a radioacti"e su*stance depends upon __________.

(its temperature, the e>ternal pressure on it, the mass o% the su*stance, thestrength o% the nuclear %orce *etween the nucleons o% its atoms!

2. __________ o% the %ollowing conser"ation laws must *e o*e'ed in a nuclearreaction.

(the conser"ation o% electric charge, the conser"ation o% energ' and mass, theconser"ation o% linear momentum, the conser"ation angular momentum, all o% these!

3. __________ o% the %ollowing particles is considered as an ideal proIectile %orinduced nuclear reactions.

($lectrons, Droton, neutron, g-particle!

4. :hen mass m is con"erted into energ' it release energ' equal to __________.



(mc2, mc3, m2c, mc!

. The splitting o% nuclei o% a su*stance into two or more %ragments, with emission

o% energ', its called __________.

(uclear %ission, uclear %usion, a-deca', one o% these!

. The process in which two smaller nuclei com*ine to corm a *ig nucleus withrelease o% energ' is called __________.

(uclear %ission, uclear %usion, a-deca', none o% the a*o"e!

. )n a %ission reaction each nucleus emits a*out __________.

(one to two neutrons, two to three neutrons, one to two electrons, two to threeelectrons!

6. __________ gi"e more energ'.

(uclear ission, uclear usion, <urning o% 7oal, one o% these!

8. The sun which is largest source o% heat energ' gets its energ' *' the process o% __________.

(uclear ission, uclear ission, uclear 7hain reaction, all o% these!

0. tomic *om* is *ased on the principle o% __________.

(uclear ission, uclear usion, uclear 7hain 5eaction, one o% these!

1. H'drogen *om* is *ased on the principle o% __________.

(uclear ission, uclear usion, uclear 7hain 5eaction, one o% these!

2. de"ice which is used to e>tract nuclear energ' with easier means and with outan' harm to en"ironment and human *eings and utili+e the energ' %or %ruit%ulpurposes in e"er'da' li%e and wor9 is __________.



(7'clotron, uclear 5eactor, H'drogen *om*, <etatron!

3. ?raphite and hea"' water are two common moderators used in a nuclear reactor.

The %unction o% the moderator is __________.

(to slow down the neutrons to thermal energies, to a*sor* the neutrons nad stop thechain reaction, to cool the reactor, to control the energ' released in the reactor!

4. 7admium rods are used in nuclear reactor %or __________.

(slowing down %ast neutrons, speeding up slow neutrons, a*sor*ing neutrons, regulatingthe power le"el o% the reactor!

. )n @iquid /etal ast <reeder 5eactor we use __________.

(water as coolant, odium metal as coolant, graphite as coolant, none o% these!

. __________ nuclear radiation detector is *ased on the principles Othatsupersaturated "apours condense more readil' on ions or dust particlesP.

(:ilson 7loud cham*er, ?eiger counter, olid state detector, none o% these!

. the olid-tate etector is *asicall' __________.

(a %orward *iased pn-Iunction, a re"ersed *iased pn-Iunction, a %orward *iasedtransistor, a photocell!

7hapter 1

d"ent o% /odern Dh'sics

1. /odern ph'sics consists o% __________.

(ewtonian /echanics, $insteins special theor' o% relati"it', chrodingers wa"emechanics, $insteins special theor' o% relati"it' and Guantum mechanics!

2. The most %undamental to classical ph'sics is&are __________.



(/a>wells equations, chrodingers wa"e equation, @aw o% newtonian mechanics,pecial theor' o% relati"it'!

3. __________ *elie"ed in a*solute time.

($instein, /a>well, ?alileo, ?alileo and ewton!

4. set o% coordinate a>es with respect to which measurements are made is called __________.

(%rame o% re%erence, inertial %rame o% re%erence, non-inertial %rame o% re%erence,none o% these!

. $"er' motion is __________.

(relati"e, a*solute, +ero, none o% these!

. %rame o% re%erence in which ewtons laws o% motion are "alid is called __________.

(7artesian %rame o% re%erence, inertial %rame o% re%erence, non-inertial %rames o%

re%erence, a*solute %rame o% re%erence!

. %rame o% re%erence in which ewtons laws o% motion are not "alid is called __________.

(7artesian %rame o% re%erence, inertial %rame o% re%erence, non-inertial %rames o%re%erence, a*solute %rame o% re%erence!

6. __________ o% the ewtonian laws don not hold in an accelerated %rame o%

re%erence.

(ewtons %irst and second law o% motion, ewtons scond and third law o% motion,third law o% motion, ewtons %irst law o% motion and law o% ?ra"itation!

8. __________ o% the %ollowing statements is not correct.



(the law o% ph'sics are the same in all inertial %rames, the speed o% light in %reespace has the same "alue in all inertial %rames, two e"ents which occur simultaneousl'in one re%erence %rame also must appear to occur simultaneous in another re%erence%rame, $instein reIected ewtons idea o% a*solute time!

10. The simple assumption that all possi*le re%erence %rames mo"ing with uni%orm"elocit' relati"e to one another are equi"alent %or the statement o% laws o% ph'sics iscalled the __________.

(Drinciple o% 5elati"it', Qncertainit' Drinciple, Daulis $>clusion Drinciple, one o%these!

11. pecial theor' o% relati"it' states that __________.

(ll laws o% ph'sics are the same in e"er' inertial re%erence %rame, $"er' motion isrelati"e, @ight has dual nature, $nerg' and mas are intercon"erta*le!

12. pecial theor' o% relati"it' states that __________.

(Time is a*solute, The speed o% light in a "acuumm, measured in all inertial re%erence%rames alwa's has the same "alue o% c, no matter how %ast the source o% light andthe o*ser"er are mo"ing relati"e to each other, space is a*solute, at rest mas o% an

o*Iect is alwa's +ero!

13. *od' o% some material capa*le o% a*sor*ing all heat radiation incident on it andcan emit in turn all the radiation at constant temperature a%ter it is in equili*riumwith it is called __________.

(<lac9 *od', <lac9 *od' radiation, <lac9 *od' ca"it', 7a"it' radiation!

14. 5a'leigh Jeans theor' is incomplete disagreement with the e>perimental cur"e o%

*lac9 *od' radiation __________.

()n the region o% short wa"elength, in the region o% long wa"elength, *oth in theregion o% short and long wa"elength, none o% these!

1. :eins theor' is complete disagreement with the e>perimental cur"e o% *lac9



*od' radiation __________.

()n the region o% short wa"elength, in the region o% long wa"elength, *oth in theregion o% short and long wa"elength, none o% these!

1. )n 1800, __________ proposed a %ormula which e>plained ) detail the wholeshape o% the *lac9 *od' spectrum %or all wa"elengths.

(:ein, 5a'leigh, $instein, /a>well Dlan9!

1. __________ proposed quantum theor' o% radiation.

(:ein, $instein, Dlan9, ewton!

16. __________ theor' e>plains that energ' e>change ta9es place in discreteO*undlesP or OquantaP.

(pecial theor' o% 5elati"it', Guantum Theor', 7orpuscular Theor', <ohrs Theor'!

18. /athematicall' Guantum theor' is states as __________.

($ B mc2, $ B h%, " B nl, none o% these!

20. @ight consists o% particle wa"e called __________.

(Droton, $lectron, eutron, Dhoton!

21. The rest mass o% photon is __________.

(Kne, Nero, )n%inite, one o% these!

22. )n 180, __________ proposed that the pac9ets or *undles o% energ' areintegral part o% all electromagnetic radiations.

(Dlan9, $instein, ewton, :ein!

23. The process o% eIection o% loosel' *ound electrons %rom a metallic sur%ace *' thea*sorption o% photons is called __________.



(Dair production, 7ompton $%%ect, Dhotoelectric e%%ect, Qncertainit' Drinciple!

24. The photoelectric e%%ect esta*lishes that __________.

(@ight tra"els in the %orm o% inertial o% quanta o% energ', @ight tra"els in the %orm o%trans"erse wa"es, light tra"els in the %orm o% longitudinal wa"es, light is a trans"erseelectromagnetic wa"e!

2. The photoelectric emission %rom the sur%ace o% a metal starts onl' when the lightincident on the sur%ace has a certain __________.

(minimum %requenc', minimum wa"elength, minimum intensit', minimum speed!

2. t %requencies o% the incident radiation a*o"e the threshold %requenc', thephotoelectric current in a photoelectric cell increases with the increase in __________.

(intensit' o% incident radiation, wa"elength o% incident radiation, %requenc' o% incidentradiation, speed o% incident emitted %rom a metal sur%ace!

2. The photoelectrons emitted %rom a metal sur%ace __________.

(are all at rest, ha"e the same 9inetic energ', ha"e the same momentum, ha"e speeds"ar'ing %rom +ero up to a certain ma>imum "alue!

26. or each material emission occurs onl' %or certain de%inite %requenc' %o o% lightcalled __________.

(1 Hert+, 7ritical %requenc', threshold %requenc', minimum %requenc'!

28. mount o% energ' in a photon depends on the __________.

(rest mass, %requenc', momentum, wa"elength!

30. The minimum energ' o% an electron that must ha"e in order to escape %rom themetal sur%ace is called __________.



(topping potential, wor9 %unction, threshold %requenc', wa"elength!

31. Dhotoelectric e%%ect is a phenomenon in which electromagnetic wa"es e>hi*it __________.

(wa"e nature, particle nature, *oth wa"e and particle nature, none o% these!

32. )n 7ompton e%%ect __________.

(The scattered photon has %requenc' less than that o% the incident photon, thescattered photon has %requenc' greater than that o% the incident photon, thescattered photon has %requenc' equal to the incident photon, none o% these!

33. Kn mo"ing %rom one place to another electromagnetic radiation *eha"es as __________.

(particles, wa"es, *oth particles and wa"es, none o% these!

34. $lectromagnetic radiation when interact with material particle, *eha"es as __________.

(particles, wa"es, *oth particles and wa"es, none o% these!

3. :hen we tr' to stop a "er' high photon it loses its identi%' and disintegrationinto an electron and a positron. This is called __________.

(Dair production, nnihilation, C-ra's production, 7ompton e%%ect!

3. process re"erse to the pair production is 9nown as __________.

(Dhotoelectric e%%ect, nnihilation, C-ra's production, 7ompton $%%ect!

3. :hen an electron and a positron com*ine together in such a wa' that *oth o%them disappear and their com*ined mass reappear as two gamma ra' photons. This iscalled __________.

(Dhotoelectric e%%ect, nnihilation, C-ra's production, 7ompton e%%ect!



36. OThe product o% the uncertainties in momentum (p! and position!>! o% particleat some instant is appro>imatel' %o the order o% Dlan9s constant hP. This is called __________.

(Daulis $>clusion Drinciple, Heisen*erg Qncertainit' Drinciple, Dhotoelectric e%%ect,7ompton e%%ect!

MCQs Physics Part II

Documents

Transcript of MCQs Physics Part II