NUST NET-1 Mcq's 1)total number of arrangement if P is fixed for word Pakistan? 2)express sin in cos if angle is A .options were cos(9o-A) etc 3)what is the change in which no heat enters or leaves the system 4)whai is dy/dx called? 5)what is mass spectrometer is used for? 6) impedance is what at resonance in a series parallel circuit? 7)sine of relcttion/sone of refractions gives? 8)what are the dimension of weight? 9)max force if 1 kg mass has 2.4 acceleration? 10)resolving power increases with ? 11)atomic bomb comprised of ? 12)f * t has same units as 1)impulse .2)momentum’s option there was both 1 and 2 kinda thing? 13)when earthquake occurs what happens to entropy? 14)radian and steraradian are? 15)what does spectrometer is used for? 16)what should hapen to make an element positive? 17)what is e/m equal to? 18)moment arm equals to? 19)what shows nature wave of particales? 20)in a single slit exp,from how many point sorces wave interfere? 21)dimension tells? 22)dimension of angular momentum? in iq 2 questions were code wale.maths ma 10 conics.15 geometery 15 sequence series 2 determinet wale..trigonometry..limit ka eik question. Complex numbers 2 4 integration 3 4..diff 2 3..sets 1 2..permutation and combination 3 4...vector 1 2...english 1 antonym and 1 synony, trival ka opposite phucha mangnemous tha,., chemistry?i never opened the fsc chem books so i dont kno...but it was all bookish..
1. the origin of field of force is 1. spin motion of nucleus 2. charge on electron 3. mass of the object 4. not yet known 2. the force experienced by unit positive charge place3d at a point in electric field is known as 1. electric field intensity 2. electric force 3. magnetic field intensity 4. capacitance 3. the electric intensity at infinite distance from the point charge is 1. zero 2. infinite 3. 1 volt /m 4. Negative 4. Two point charges of 16 micro C and 4 micro C are separated by a distance of 3.0 m, the spot on the line joining the two charges where electric field is zero is 1. Between the two charges
2. Left of 4 micro C charge 3. Right of 4 micro C charge 4. Right of 16 micro C charge 5. If a close surface contains two equal and opposite charges, the net electric flux from the surface will be 1. Positive 2. Negative 3. Zero 4. None of these 6. Electric flux is a 1. Vector quantity 2. Scalar quantity 3. Tensor 4. Abstract 7. A charge of 0.1 C accelerated through a potential difference of 1000 V acquires K.E 1. 200 J 2. 1000 J 3. 400 J 4. 100 J 8. The value of relative permittivity constant for air is 1. 1.006 2. 1.0006 3. 1.000006 4. 1.6 9. Sharks have special organs, called the ampullae of lorenzini that detect potential difference of the order of 1. Milli volt 2. Micro volt 3. Nano volt 4. Pico volt 10. The motion of windshield wipers of cars is the application of 1. Energy stored in capacitor 2. Charging and discharging of capacitor 3. Energy density 4. None of these 11. The capacitance of a capacitor increases by 1. Decreasing , separation between plates 2. Increasing area of plates 3. Placing dielectric between plates 4. All 12. Who introduced the concept of electric o electric field lines 1. Michael Fa raday 2. Maxwell 3. Dalton 4. Newton 13. Which one is a photo conductor
1. Selenium 2. Sodium coated oxides 3. Potassium coated oxide 4. All 14. Two points have a difference of potential of 10 volts. Work done in moving a charge of 5 coulomb from one point to another is 1. 2j 2. 50 J 3. 10 J 4. 12J 15. A charged oil drop is stationary between two metallic plates. If the drop caries a charge of q C and mass m kg, the PD between plates is 1. F/q 2. qE 3. mg/d 4. mgd/q 16. in ERG, the graph is plotted between time and 1. current 2. potential difference 3. forc3e 4. work 17. pyrex 17. pyrex glass is an example of 1. conductor 2. insulator 3. semi conductor 4. dielectric 18. the vessel containing electrolyte and two electrodes is kno wn as 1. acquifier 2. voltameter 3. primary cell 4. voltmeter 19. Rheostate consists of a wire of 1. Manganin 2. Silver 3. Aluminium 4. Molybedenum 20. If the fourth band is silver then the tolerance is 1. 10 % 2. 20 % 3. 5% 4. 50% 21. A zero ohm resistor is indicated by 1. orange band 2. Four black band 3. One black band 4. Red band
22. If length of wire is doubled uniformly by stretching the wire then its resistance becomes 1. Four times 2. One fourth 3. Two times 4. Remains same 23. The terminal potential difference is greater than emf of a cell when 1. R = infinity 2. Battery is supplying current 3. R = 0 4. When battery is being charged 24. The total flux through a closed surface depends upon 1. Shape of closed surface 2. Geometer of the closed surface 3. Charge enclosed by the surface 4. All of the above 25. Two plates are 2 cm apart. A potential difference of 10 V is applied between them, the electric field between the poates is 1. 200 N/C 2. 2 N/C 3. 500 N/C 4. 5 N/C 26. A 40 watt 100 watt and 150 watt bulbs are connected in series across 220 volt supply. Which bulb will be brightest? 1. 150 watt 2. 100 watt 3. 40 watt 4. All have same brightness 27. An ideal voltmeter has resistance 1. finite 2. Zero 3. Constant 4. Infinite 28. When the potential difference is applied across the condu ctor a directional flow of electrons sets up. The drift velocity of electrons _ with increasing temperature 1. Increases 2. Decreases 3. Constant 4. First increase then decreases 29. A 60 watt lamp operates at 50 % effiency. How much energy is dissipatedin 10 sec 30. 200 J 31. 300 J 32. 600 J 33. None of these 34. A thermistor measures very low temperature near 1. 5 C 2. 5K
3. 10 C 4. 10k 35. Resistance offered by a meter cube of a material is known as 1. Conductivity 2. Resistivity 3. Inductivity 4. Conductance 36. An electrical motor has power 500 W the current drawn through it is 4A Find potential difference 1. 126 V 2. 127 V 3. 125 V 4. 120 V 37. One thousand watts of electric power is transmitted to a device by means of two wires, each of which has resistance of 2 oh. If the resulting potential difference across the decive is 1000 volts the potential difference across the source supplying power is 1. 240 V 2. 100 V 3. 50 V 4. 200 V 38. An electric charge on the surface of a hallow metal sphere is doubled, the electric field intensity at middle, inside the sphere 1. Increases decreases 2. Remains same 3. Zero 39. Modern periodic table has number of groups and number of periods 1. 8,12 2. 12,7 3. 7,8 4. 8,7 40. F block elements are also called 1. Outer transition element 2. Inner trasition elements 3. Alkaline earth elements 4. Coinage earth metal 41. Which one of the following elements has the non variable oxidation state 1. Berylium 2. Chlorine 3. Bromine 4. Nitrogen 42. The elements of 1 A and II A group are obtained by the electrolysis of their molten 1. Chlorides 2. Carbonates 3. Nitrate 4. Oxides 43. Which element is the most electropositive in the periodic table
1. Barium 2. Calcium 3. Potassium 4. Cesium 44. What are the products of the thermal decomposition o f lithium nitrate? 1. Lithiumnitride and oxygen 2. Lithium oxide, nitrogen and oxygen 3. Lithium osice, nitrogen dioxide and oxygen 4. Lithium oxide and nitrogen 45. Uniqueness of mendeleev’s periodic table is that he 1. Determined atomic mass of elements 2. Classified elements inot 12 periods 3. Left empty spaces for undiscovered elements 4. Placed Na, K with Ca and Mg 46. Which one of the following determines the position of an element in the periodic table? 1. Chemical reactivity 2. Number of electorns in outer orbital 3. First ionization energy 4. Number of protons in the nucleus of its atom 47. Lattice energy of carbonate of alkaline earth metals increases down the grup because of 1. Increase in the size of cation 2. Decrease in polarization 3. Both a and c 4. None of the above 48. As we move from groups IA to groups IIA which of the following trend is incorrect 1. Metallic radus decreases 2. First ionization energy increases 3. Thermal stability decreases 4. Solubility of compounds 49. All the following elements of IA group form super ox ide except 1. Na 2. Rb 3. K 4. Cs 50. Group of elements in the modern periodic table is based on 1. Core electrons 2. Inert electron pair 3. Valence electrons 4. Lone pair of electron 51. Which of the following elements imparts brick red color in the flame 1. Na 2. Ca 3. K 4. Sr 52. Which of the scientists experimentally proved that element should be arranged in the periodic table on the basic of atomic number and not on the basic of atomic mass
1. Mendeleev 2. Newland 3. Dobereiner 4. Moseley 53. Elements in the periodic table are classified into four blocks. This classification is bsed upon 1. Valence orbital 2. Sub-shell 3. Shell 4. All 54. Which of the following elements has greatest value of first ionization energy 1. N 2. O 3. C 4. B 55. Which halogenhas greatest value of electron affinity 1. F 2. Cl 3. Br 4. I 56. Ionization energy is the index to the metallic character. The element which have 1. Low ionization energy meals 2. High ionization energy nonmetals 3. Intermediate metalloids 4. All 57. Which is incorrect statement? 1. 1st electron affinity value is always negative 2. Term electronegativity is associated with molecule 3. Electron affinity is associated with atom 4. Oxidation number increases down the group 58. Which statement about oxidation number is incorrect 1. Oxidation number increases along the period 2. Oxidation state is the apparent charge on an atom in the compound 3. Transition elements show more than one oxidation number 4. Maximum oxidation number is +7 59. Which of the element is the best conductor of electricity ? 1. Zn 2. Fe 3. Cu 4. Ca 60. Hydration energy depends on 1. Charge on ion \ 2. Size of ion 3. Both a and b 4. None of these 61. Hydrogen has which of the following properties?
62. it act as reducing agent like IA group elements 63. It shows resemble with IA, IVA,VIIA group 64. During electrolysis it is collected at cathode like metals 65. All 66. Keeping in view the size of atoms, which order is correct one? 1. Mg>Sr 2. Ba>Mg 3. Cl>i 4. Lu>Ce 67. Which is incorrect? 1. All the metal are good conductors of electricity 2. All the metals are good conductor of heat 3. All the metals form positive ions 4. All the metals from acidic oxides 68. Which one of the following minerals has no calcium 1. Gypsum 2. Dolomite 3. Calcite 4. Carnallite 69. Which of the following eolement can only react with NaOH 1. Be 2. Mg 3. Ca 4. Ba 70. Which of the following oxides in insoluble ion H2O 1. BeO 2. MgO 3. Both 4. CaO 71. Na is obtained by electrolysis of molten NaCl by 72. galvanic cell 73. Down cell 74. Nelson cell 75. Fuel cell 76. Which is the use of sulphur? 1. Essential constituent of plant 2. Has influence on chlorophyll development of leaves 3. For the enlargement of root system 4. All 77. Which of the element form polymeric halides? 1. Na 2. Al 3. S 4. C 78. Which is nt a use of lime 1. As dehydrating agent
2. In iron extraction 3. Manufacturing of bleaching powder 4. As flux in welding 79. Oxides of beryllium are 1. Acidic 2. Basic 3. Amphoteric 4. Neutral 80. In electrolysis of aqueous solution of NaCl the primary product obtained at anode electrode is 1. Na 2. Cl2 3. NaOH 4. NaCl
Decrease in force is maximum for?? (Distilled water) F is force btween two charges and charge 2Q is attached with a charge and then seperated. The new force will be?? Body falling due to gravity.. Direction of acceleraion???? Unit of electric intensity??? will current pass through a capacitor attached to an DC source?? peed of electrons through a conductor which is not given any potential diffrnce?? V directly proportional to I.. What is constant ??/ (R) Which material is used as common condustor in daily use?? (Copper) Induced emf depends upon...??? Ac is converted in to Dc by??? (rectifier)... Is dafa test main Scientist k name b puchay huay thay,... Reactance of inductor is equal to??? ( 1/wL) which has wavelength greater than red light...??/ ( Infrared)... waht is unit of electric intensity? If frequency of indutor increase then its inductance will? A diamond is? (noncondutor) If capacitor is connected with battery and its fully charged then current follow? (current not flow? What is indicators? Noble gases exist as? (free state) Which group has max. I.E 1Aor2A? What is fourh power of x in sixth power of (2-x)? MOost mcqs of math in chp6 last exercise? What is the sum first 50 real no's? What is unit of momentum? Electromagnetic radiation have grater wavelenght than red light? Product of two matrix is possible? What is meaning of ''enigma''?
sin60 equal to? What is formula of Tan@? What is formula of cos2@? If Xrays fall on which following to produce photoelectrons?(plastic) First question of 2.10? as mcq Highest I.E of noble gas? Na is? Which of following are uses of spectrometer? Entropy of Universal in natural process? (increses) Colligative properties depend on? Find energy of inductor lenth and current are given? (1/2LI2) In house which is connected in series? (fans,bulb,tubes,none)? Boyl's law is applicable for those gases? The equation which doesnot change by replacing x with 1/x is known as : A.linear B.quadratic C.proportional D.none A basic character of alkali oxide? Velocity of electron on outermost shell is ? Maximum Minimum Zero Intermediate Chemical composition of sindhur? Fluminate means? Centrifugal force of a body depends upon ? A weight B mass C volume D none Value of weins constant? Synonym were dowdy , blemish , fluminate , amiable Net 1 Transmution is decay of A alpha particle B beta particle
C gamma particle D none Sum of coefficient on expansion of (x+y)^5 is ? Disintegration of radioactive element is Periodic Random Predictable None Simplify 2Sin-1(3/5) . In the prep of Sulphuric Acid ,what is done in Contact towers ? if the median of a triangle on a hypotenuse has a length 6 then what is the length of hypotenuse? A. 36 B. 6 C. 16 D. 12 - ______________________________________________________________________________ _______________________________________________
Mcqs of 4th may basic quantities in physics when mica placed in capacitor charg increase or decrease. meaning of kindle no of phases b/w prophase and telophase 5dimension of velocity
Some of the MCQ's I remember..NET 27 Morning. 1) the Quality factor in resonance is 2)the unit of planks constant is same as 3)Range is Max for angle? 4)projectile path is called? 5)magnet can be demagnitized by? 6) Max k.e of x rays depends on?
stions from 28th april test. 1. Opposite in meaning of the word throttle. 2. Amity means. 3. Penicillium belongs to (deutromycota). 4. Ionization energy of which noble gas is highest. 5. Ballistic missile are (unpowered and unguided).
28 april NET questions..... boiling point of benzene?? ans 80.2 artrial wall consists of how many layers?? ans 3 ARID is most similr to??? ans Barren water circulates throughout the world by?? ans i thnk water cycle jargon is similar to?? ans comprehensible vocabulary glycolate is converted into glycine in?/ ans peroxisomes Hcl is secreted by?? ans oxyntic cells analogy : propose,stipulate?? .
The controlled Fission reaction is due to presence of a. core b. moderator c. heavy water d. control rods <<< benzene is lesser reactive than A. Ethene <<<< B. Ethane C. Methane D. Butane
Select the odd one A. March B. may c. July d. October
342 grams of sugar and 12 grams of carbon have A. same atoms B. sugar has greater c. carbon has greater d. insufficient data
1. boiling point of benzene. 2. opposite of forlorn. 3. meaning of bear out? 4. bait means? 5. third important vessel in earthworm? 6. do lymphatic system have valves? 7. tiger : tigress ..... ans- fox : vixen
Decrease in force is maximum for?? (Distilled water) F is force btween two charges and charge 2Q is attached with a charge and then seperated. The new force will be?? Body falling due to gravity.. Direction of acceleraion???? Unit of electric intensity??? will current pass through a capacitor attached to an DC source?? peed of electrons through a conductor which is not given any potential diffrnce?? V directly proportional to I.. What is constant ??/ (R) Which material is used as common condustor in daily use?? (Copper) Induced emf depends upon...???
Ac is converted in to Dc by??? (rectifier)... Is dafa test main Scientist k name b puchay huay thay,... Reactance of inductor is equal to??? ( 1/wL) which has wavelength greater than red light...??/ ( Infrared)... waht is unit of electric intensity? If frequency of indutor increase then its inductance will? A diamond is? (noncondutor) If capacitor is connected with battery and its fully charged then current follow? (current not flow? What is indicators? Noble gases exist as? (free state) Which group has max. I.E 1Aor2A? What is fourh power of x in sixth power of (2-x)? MOost mcqs of math in chp6 last exercise? What is the sum first 50 real no's? What is unit of momentum? Electromagnetic radiation have grater wavelenght than red light? Product of two matrix is possible? What is meaning of ''enigma''? sin60 equal to? What is formula of Tan@? What is formula of cos2@? If Xrays fall on which following to produce photoelectrons?(plastic) First question of 2.10? as mcq Highest I.E of noble gas? Na is? Which of following are uses of spectrometer? Entropy of Universal in natural process? (increses) Colligative properties depend on? Find energy of inductor lenth and current are given? (1/2LI2) In house which is connected in series? (fans,bulb,tubes,none)? Boyl's law is applicable for those gases? Prepared by (AIZA ASLAM). Best of Luck ALL students...... please pray f0r me that i get g0od merit no .. PRAYERz NEEDED :)
A is father of C and D is son of B. E is brother of A. If C is sister of D, how is B related to E?
oxidation state oif sulpher in h2so4 is.............. formula of malonic acid is............ simplest form of fructose is ...........
f2 is reactive because of............ disassosiation energy. in contact chamber which happens........ bond angle b/w NF3 is.....102 formula of phosphoric acid is......... which of the followings doesnot react with alcohols........hbr,cl2,br2,pi3 at resonance rlc series circuit becomes ............resistive, when accentricity is e then a=................... which of the following produce intence lazer beam.......laser two charges Q and q are halved and distance becomes doubled then force becomes.......f/2,f/16,f/8 the fringed widh in double slit experiment is directly proportional to..........wavelenth,distance,..... r1=7,r2=5,r3=8,in which of the following the current will be maximum....... which of the following is the hysenberg uncertainity principle....... in comptons effect the wavelenth of the scatered photon is ......increase,decrease.. when the ac is connected with covstant voltage then ..........current decreases with with time..... h2 and o2 react and form the following cell....fuel cel,electrolytic cell,hydrogen cell,oxygen cell... which of the following is the pollutant........ if p1=10w and i1=2A what is P2 when i2=1A.........5,10,15,... which of the following convert the heat energy into electrical energy.....thermocouple,......... right hand rule is used to measure the ...magneticfield,electrical energy,....... find B when meu=4pi.10^7,and I=1A ........... on heating Iron which of the followig changes............colour,density,lenth,....... if emf f generator is is 10V and then angular vilocity becomes double then final emf becomes....20V if NS/NP IS turn ratio then for step up transformer ........NS>NP....... ...... which of the following doesnot occur as waves.....electric field, stationary wave, transverse waves,electromagnetic... convertion of ac into dc is known as...........rectification...... MAGNIFICATION IS THE RATIO BETWEEN Fo and...........Fe,......... find the sum of the series .(2n-1)........... confining of wave into one plane is called ............polarization........ if cp=10,cv=7,then then general gas constant becomes...........3 electron volt is the unit of ......energy what happens when the ice melts.....entropy increase a vector having 1 magnitude is called....unit vector the time duration b/w two consecutive heartbeats of a normal human being??....8*10^-1 s in astronomical telescope which of the following has g reater focallength.........objective lense for a body executing SHM acceleration is max at.....Mean positiion,extreem position,in b/w mean and extreme,none 1degree is equal to how many radians.....0.01745 correct spelltng of' Mathematics' were asked correct spelling of nascent were asked PHYSICS: (Based on concept and numericals) e.g Q= a car passes an observer and apply brakes, what is the direction of angular acceleration of
Wheels? (towards observer,away from observer....etc) Q= a body is moving in a circular path with uniform velocity its (energy is constant linear momentum is changing both are changing...etc.) Q=Volume of a sphere hving radius 17cm?
1. Which series lie in ultra violet region? 2. If force is 2.5N velocity changes from 50 to 100m/s and time is 50s the mass of the body? 3. Dimensions of power? 4. Which one is vector quantity? Electric field, charge on moving particle etc. 5. The energy stored in compressed spring is called? 6. Max range of projectile? Formula 7. Work will be -ve if angle b/w force and displacement is? 8. Types of mechanical energy? 9. If spring constant is 2 and displacement is also 2 then sum of KE and PE? 10. If we double the value of G then g? 11. If the equator is moving downward then apparent weight? 12. If particle displaced in direction perpendicular to waves then waves are? 13. Which phenomenon is the most applicable example of wave nature of light? Reflection,refrection,etc. 14. The ratio of angles subtended on eye by the object is called? 15. The atoms of gas are in_____motion. 16. If we half the distance b/w two charges then force will be? 17. RH rule is used for determination of? Electric field magnetic field etc. 18. If the angle b/w electric field and vector area A is pi/3 then electric flux? 19. If R1>R2>R3 then: Re>R1, Re
. If a die is rolled 2 time then probability of numbers whose sum is 8? 2. Sin inverse(sin pi/2)=? 3. Derivative of cosec inverse(x)=? 4. Domain of cosec inverse(x)=? 5. Sin inverse 3/4 + sin inverse sqrt(7)/4=? 6. How many hours are there in 360 degrees? 7. How many terms are there in the expansion of (1+x)^n? 8. Derivative of 2t^3 w.r.t 3t^2? 9. 1,1/3,1/5,1/7........is? geometric,arithmetic,harmonic 10. Difference b/w AM and GM b/w 5 and 7? 11. (4-i)^2 real component?
12. Which one is comutative? AUB=BUA, AUB=AUB etc 13. If x^4-3x+4=0 the roots? Roots were given in the option we have to chk only. 14. Cube roots of unity are? 15. 4x/(x-1)(x+1) = A/(x-1). + B/(x+1) the A,B ? 16. If 1,3,5,7,...... Then nth term. 17. Two numbers whose sum is 20 and their product is minimum. 18. x<0, y<0 lie in which quadrant? 19. Sin(-a)=? 20. Domain of function 1/ sqrt(x^2+3x+2) 21. If f(x)=x^3 then f inverse(x)? 22.There were two questions in which 2 side and 1 angle were given and we were to find the area of triangle. 23. Points were given and we were to tell the figure by joining them. 24. Two tables were given in which we were to tell the the linear relation. elecromagnetic waves are the phenomenon of? 25. A conductor used frequently now a days? Copper,silver etc. 26. Correct relation for time dialtion? 27. Black body is? Bad absorber, ideal absorber emmiter etc. 28.Radio activity is related to? Inside nucleus,outside n ucleus etc. 29. Which gas is not used in GM counter? 30. Charge on up quark?
NET Vocabulary 1) enigma 2) flippant 3) exacerbate 4) abhor 5) censure 6) prodigal 7) magnanimous 8) nuzzle 9) benign 10) august 11) sumptuous 12) benign 13) fulminate 14) analogous 15) sluggish 16) apportion 17) vivacious 18) beckon
19) dowdy 20) blemish 21) amiable 22) aggregate 23) obesity 24) acrid 25) knave 26) elicit 27) illicit 28) intricate 29) badger 30) kindal 31) barbaric 32) pauper 33) engross 34) improvise 35) horde 36) fleece 37) tranquility 38) gregarious 39) venial 40) blemish 41) arrogate 42) stingy 43) calm 44) dowdy 45) apprise 46) beckon 47) perturbed 48) subdue 49) adulterate 50) audacious 51) venial 52) spontaneous 53) artful 54) effusive 55) appalled 56) intrepid 57) knave 58) ascribable 59) brunt 60) prodigality 61) throttle
(1)
(2) (3)
If the instantaneous current in a circuit is given by I=2sin( value of the current is
(a) 2A (b) 2A (c) 2 2 A (d) zero Hot wire ammeter can be used for measuring (a) a.c only (b) d.c only (c) both a.c and d.c (d) neither a.c nor d.c Power delivered by an A.C. source of angular frequency to an LRC series circuit is maximum when (a) L = R
(4)
(5)
(6) (7)
(8)
(9) (10)
(11)
(12)
(13)
(14) (15)
t+θ)amperes, the rms
(b) L = C
(c)
L
1 C
(d)
L
R C
The impedance of a circuit consist of 3 resistance and 4 reactance. The power factor of circuit is (a) 0.4 (b) 0.6 (c) 0.8 (d) 1 The same alternating current is flowing in two circuits A&B. A contains only capacitor, B contains only inductor. If the frequency of the supply is increased in both the current (a) increases in both (b) decreases in both (c) increases in A decreases in B (d) decreases in A increases in B Dimension of L/CR is same as that of (a) L (b) R (c) C (d) none of these In an a.c circuit average value of (a) current is zero (b) power dissipation is zero (c) square of current is zero (d) none of these In frequency modulation ______ of carries waves changes with _____ of audio signal (a) amplitude, amplitude (b) amplitude, frequency (c) frequency, amplitude (d) frequency, frequency The peak value of A.C voltage is 5 2 its Vrms is (a) 20V (b) 10V (c) 5V (d) 15V The value of mutual inductance can be increased by (a) decreasing N (b) increasing N (c) Winding the coil on wooden frame (d) winding the coil on china clay Induced current in a circuit depends upon (a) induced emf (b) speed of conductor (c) resistance of conductor (d) all of these Induced emf in a circuit can be produced by (a) moving a bar magnet towards a coil (b) changing area of the coil in a magnetic field (c) by rotating a coil in a magnetic field (d) all of these Eddy currents can be decreased by (a) using a soft iron core (b) increasing the number of turns in primary (c) using laminated sheets for core (d) all of these The primary and secondary coils of a transformer are linked (a) electrically (b) magnetically (c) chemically (d) are not linked at all In case of an alternating current generator current alternates direction
(16)
(17)
(18)
(19)
(a) f times in a cycle (b) 2f times in a cycle (c) f times per second (d) all of these In an inductor the energy is stored in (a) electric field (b) magnetic field (c) both electric and magnetic field (d) no energy is stored in an inductor Self inductance of solenoid is increased by
(a) increasing current in the coil
(b) increasing area of cross-section of the coil
(c) passing A.C instead of D.C
(d) all of the above
Mutual inductance of a coil depends upon
(a) number of turns of two coils
(b) area of cross-section of two coils
(c) material of core
(d) all of the these
An emf is induced in a wire subjected to a changing magnetic field. The magnetic induction B of this field varies with time as shown in graph at which point is the induced emf maximum
B
O A
(a) A (20)
(21)
(22)
(23) (24) (25)
(26)
(b) B
B
C
D
t
(c) c
(d) both b and c
The output power of an ideal transformer is
(a) greater than input power
(b) less than input power
(c) equal to input power
(d) equal to input power if turn ratio is 2:4
A charge particle is moving in a uniform magnetic field. If the value of B is doubled, its time period becomes (a) doubles (b) remains same (c) is halved (d) quadrupled A current is flowing in a wire C as shown in the figure. The force on this conducting wire will be
(a) towards right (b) towards left (c) downwards Which device can control A.C without consuming energy (a) resistor (b) rheostat (c) choke Capacitor offers opposition to the flow of (a) D.C (b) A.C (c) both “a” and “b” In case of a capacitor connected across an A.C supply
(d) upwards (d) potentio-meter (d) none of these
(a) voltage and current are in phase
(b) voltage lags current by
(c) voltage lead current by /2 Back emf in motor
(d) none of these
2
(27)
(28)
(a) increase with increase in speed
(b) decrease with increase in speed
(c) remains constant
(d) no back emf is produced in motor
The armature current in a DC motor is maximum when motor has
(a) just started
(b) just been switched off
(c) picked up maximum speed
(d) intermediate speed
Lenz`s law is a consequence of the law of conservation of
(a) Charge (29)
(b) energy
(c) momentum
(d) mass
The current in a coil changes from 0 to 2A in 0.05sec. if the induced emf is 80V the self inductance of the coil is
(a) 1H (30)
(b) 0.5H
(c) 1.5H
(d) 2H
An iron bar is placed near a magnet as shown, which diagram correctly shows the induced magnetism of the iron bar?
(31)
(32)
(33)
(34) (35)
(36)
(a) (b) (c) (d) The maximum value of induced emf in a coil rotating in magnetic field does not depend on (a) the resistance of coil (b) the number of turns in the coil (c) the area of the coil (d) rotational frequency of the coil Electricity is transmitted at high voltage rather than at low voltage because (a) it is greater at high voltage (b) it is safer (c) it requires less insulation (d) it wastes less energy When magnet was pushed towards a solenoid, the meter connected to the solenoid showed a deflection to the right, when the same magnet was pulled away from the solenoid at the same speed, what was the deflection on the meter? (a) greater and to the right (b) the same and to the right (c) the same but to the left (d) zero An electric motor could be used as a (a) battery (b) capacitor (c) dynamo (d) transformer When a magnet is moved into the coil of wire shown, there is a small reading on the sensitive meter, which change would increase the size of the reading? (a) moving the magnet faster (b) pulling the magnet out (c) pushing in the S-pole (d) unwinding some of the turns of wire At what time the instantaneous voltage is half of the maximum voltage (T is time period) (a)
(37)
T 2
In R-C series circuit
(b)
T 12
(c)
T 6
(d)
T 4
(a) voltage and current are in phase (c) current leads voltage by (38) (39) (40) (41)
(42)
(43)
(44) (45)
2
(b) voltage leads current by (d) none of these
(b)
o o
(c)
1 o o
(47)
(48)
(49) (50)
2
If the frequency of A.C supply across an inductor is doubled then its reactance (a) remains same (b) is doubled (c) halved (d) quadrupled At what frequency will an inductor of 1.0H have a reactance of 500Ώ (a) 50 Hz (b) 60 Hz (c) 70 Hz (d) 80 Hz In acceptor circuit at resonance the impedance of the circuit is (a) zero (b) minimum (c) maximum (d) infinite If the capacitance of a tuning circuit is doubled and inductance is halved then its frequency (a) doubles (b) is halved (c) is quadrupled (d) remains same Which of the following statements is wrong regarding electromagnet ic waves (a) travel in free space at the speed of light (b) travel with same speed in all media (c) are transverse (d) are produced by accelerating charge In which of the following sequences are the electromagnetic waves in decreasing order of frequency. (a) ultraviolet, infrared, x-rays, radio (b) γ-rays, x-rays, infrared, radio (c) radio, infrared, visible, ultraviolet (d) none of these Ozone layer absorbs (a) infrared radiation (b) microwaves (c) radio waves (d) ultraviolet Speed of electromagnetic waves is given by
(a) oo (46)
(d)
1 o o
Why does a transformer have a core made of iron. (a) iron has a high melting point (b) iron is a conductor of electricity (c) iron is a conductor of heat (d) iron is a magnetic material A metallic circular ring is suspended by a string and is kept in a vertical plane. When a magnet is approached towards the ring then it will
(a) remain stationary (b) get displaced away from the magnet (c) get displaced towards the magnet (d) nothing can be said In a step up transformer there are 100 turns in the primary and 200 turns in the secondary. A dry cell of emf=1.5volt is connected across the primary. The voltage across the secondary is (a) 3 volt (b) 1.5 volt (c) zero (d) 0.75 volt Which of the following makes use of the principle of electromagnetic induction (a) voltmeter (b) galvanometer (c) ohm meter (d) D.C generator Time period of a charged particle moving in a magnetic field
(a) increases with increase in speed (c) increases with decreases in speed (1)
CHAPTER 17+18+19 Which of the following graphs represent the variation of particle momentum and the associated de-Broglie wavelength? P
(2)
(3)
(4) (5) (6)
(7)
(8)
(9)
(10) (11)
(12)
(b) decreases with increase in speed (d) independent of speed
P
P
(c) (a) (b) (d) In an operational amplifier as a night switch the potential across the LDR during night (a) increases (b) decreases (c) remains constant (d) becomes zero Stopping potential for photoelectrons. (a) does not depend on the nature of cathode material (b) does not depend on the frequency of the incident light (c) depends on both the frequency of the incident light and the nature of the cathode material (d) depends on the intensity of the incident light All magnetic materials lose their magnetic properties when (a) dipped in water (b) dipped in oil (c) strongly heated (d) brought near a piece of iron Bonding in a germanium crystal is (a) metallic (b) ionic (c) covalent (d) none of these The p-side of a junction diode is earthed and the n-side is given a potential of – 2V. The diode will (a) break down (b) conduct (c) not conduct (d) conduct partially The truth table A B Y 0 0 1 1 0 0 0 1 0 1 1 0 corresponds to (a) NAND gate (b) NOR gate (c) AND gate (d) NOT gate A photon of energy 1.5MeV collides with a heavy nucleus which of the following is the dominant phenomenon (a) Compton’s effect (b) pair production (c) photoelectric effect (d) all are equally probable The area of hysteresis loop is an indication of (a) coercivity of the material (b) retentivity of the material (c) energy dissipated per cycle (d) none of these Soft iron is preferred for the core of a transformer because it has (a) large coercivity (b) large retentivity (c) large loop area (d) small loop area Super conductors offers (a) little resistance to electric current (b) large resistance to electric current (c) no resistance to electric current (d) moderate resistance to electric current In a pnp transistor, the p-type crystal acts as
(13) (14)
(15)
(16)
(17)
(a) emitter only (b) collector only (c) either emitter or collector (d) neither emitter nor collector. The current gain in a common emitter transistor is (a) more than 1 (b) less than 1 (c) equal to 1 (d) zero In an intrinsic semi conductor the number of (a) electrons are greater (b) holes are greater (c) electrons and holes are equal (d) none of these In the depletion region of an unbiased pn junction diode, there are (a) only electrons (b) only holes (c) both electrons and holes (d) only fixed ions When n-type semiconductor is heated, the (a) number of electrons increases while that of holes decreases (b) number of holes increases white that of electrons decreases (c) number of electrons and holes remains the same (d) number of electrons and holes increases equally. In the case of forward biasing of pn junction, which one of the following figures correctly depicts the direction of the flow of charge carriers? P
P
N
(a)
(b)
N
P
L
(19)
A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be (a) a pn junction (b) an intrinsic semiconductor (c) a p-type semiconductor (d) an n-type semiconductor Two identical p-n junction may be connected in series with a battery in three ways. The potential drops across the two p-n junctions are equal in R C
2
2
L
R L
C
R C
circuit 1
(21)
2
(d)
L
(20)
R C
(c) (18)
N
2
L
R C
2
2
L
R C
circuit 2
2
L
R C
circuit 3
(a) circuit 1 and circuit 2 (b) circuit 2 and circuit 3 (c) circuit 3 and circuit 1 (d) circuit 1 only. Which of the following groups represents polymeric solids (a) glass, polystyrene, nylon (b) polystrene, rubber, sodium chloride (d) polythene, rubber, nylon (c) glass, gold, polythene The de-Broglie wavelength of a neutron when its kinetic energy is K is λ. What will be its wavelength when its kinetic energy is 4K? (a)
4
(b)
2
(c) 2
(d) 4
(22) (23)
(24)
(25) (26)
(27)
Moving with the same velocity, which of the following has the longest de-Broglie wavelength? (a) -particle (b) -particle (c) proton (d) neutron The temperature at which a ferromagnetic material becomes paramagnetic is called (a) critical temperature (b) inversion temperature (c) neutral temperature (d) curie temperature The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6eV fall on it is 4eV. The stopping potential is (a) 2V (b) 4V (c) 6V (d) 10V No of inputs in NOT gate are (a) one (b) two (c) three (d) four Crystalline solids have (a) long range order and no definite melting point (b) long range order and sharp melting point (c) short range order and sharp melting point (d) none of these Boolean expression for NOR gate is (d) A.B (a) A . B = Y (b) A+B = Y (c) A B Y Y A hole in a p-type semi conductor is (a) an excess electron (b) a missing electron (c) a missing atom (d) an excess atom The work functions for three different metal A,B and C are a, b and c respectively with a > b > c. The graphs between stopping potential (Vo) and frequency of incident radiation for them would look like
(28) (29)
2
O
t
B
2
B
t
O
O
t
B
2
B
2
(30)
(32) (33)
(34)
O
(a) (b) (c) (d) The electron, accelerated by a potential difference V has de-Broglie wavelength . If the electron is accelerated by a p.d.4v, its de-Broglie wavelength will be (a) 2
(31)
t
(b) 4
(c)
2
(d)
4
The majority current carriers are (a) electrons in p-type semiconductors and holes in n-types semi-conductors (b) electrons in n-type semiconductors and holes in p-type semiconductors (c) electrons in both p and n type semiconductors (d) holes in both p and n type semiconductors. At absolute zero of temperature, the electrical conductivity of a pure semiconductor is (a) zero (b) about 103 (m)1 (c) about 107 (m)1 (d) infinity Choose the only incorrect statement from the following (a) in conductors, the valence and conduction bonds may overlap (b) substances with an energy gap of the order of 10eV are insulators (c) the resistivity of a semiconductor increases with increase in temperature (d) the conductivity of a semiconductor increases with increase in temperature. If a rubber ball is taken down to a 100m deep lake its volume decreases by 0.1% if
g = 10m.sec2 then bulk modulus of elasticity for rubber in N/m2 is (a) 105 (b) 106 (c) 108 (d) 109 The addition of a minute quantity of antimony to a silicon crystal makes it (a) a good insulator (b) a good conductor (c) a p-type semiconductor (d) an n-type semiconductor The p-n junction diodes are used as (a) amplifiers to ‘build up’ a given ac signal (b) rectifiers to change ac to dc in power supplies (c) oscillators to produce ac signals of desired amplitude and frequency (d) none of these The output from a full wave rectifier is (a) an ac voltage (b) a dc voltage (c) zero (d) a pulsating unidirectional voltage A half wave rectifier is being used to rectify an alternating voltage of frequency 50 Hz. The number of pulses of rectified current obtained in one second is (a) 50 (b) 25 (c) 100 (d) 200 A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of (a) each of them increases (b) each of them decreases (c) copper increases and that of germanium decreases (d) copper decreases and that of germanium increa ses. In a typical transistor, the collector current is (a) slightly less than the emitter current (b) slightly more than the emitter current (c) equal to the emitter current (d) equal to the base current. Which one of the following graphs in the figure shows the variation of photoelectric current (I) with intensity of light in photo electric cell
(35)
(36)
(37)
(38)
(39)
(40)
(41)
(42)
(a)
(b)
(c)
(d)
For a photoelectric cell, the graph in the figure showing the variation of the cut off voltage Vo with frequency (v) of incident light is
2
2
2
2
(43)
(a) (c) (d) (b) At which relativistic speed the mass of an object will be come double than its rest mass
(a) (44)
(45)
(46)
(47)
(48)
c 2
(50)
(c)
2
2c 3
(d)
2c 3
The work function for aluminium surface is 4.2eV and that the sodium surface is 2.0 eV. The two metals were illuminated with appropriate radiation so as to cause photo emission then (a) both aluminium and sodium will have the same threshold frequency (b) the threshold frequency of aluminium will be more than that of sodium (c) the threshold frequency of aluminium will be less than that of sodium (d) the threshold wavelength of aluminium will be more than that of sodium A crystal lattice is (a) a random arrangement of atoms in a crystal (b) a random arrangement of molecules in a crystal (c) an ordered arrangement of points in space (d) a piece of crystal The photoelectrons emitted from a metal surface (a) are all at rest (b) have the same kinetic energy (c) have the same momentum (d) have speeds varying from zero upto a certain maximum value Violet light can cause photoelectric emission from a metal but blue light cannot. If sodium light is incident on the metal, then (a) the photoelectric current decreases (b) the number of photoelectrons ejected per seco nd increases (c) the velocity of photoelectrons increases (d) no photoelectric emission occurs In common emitter amplifier the phase difference between input signal voltage and out put voltage is
(a) 0 (49)
3c
(b)
(b)
(c)
4
2
(d)
A proton and an electron move with the same velocity, the associated wavelength for proton is (a) shorter than that of the electrons (b) longer than that of the electrons (c) the same as that of the electrons (d) zero The number of crystal systems based upon the geometrical arrangement of atoms are (a) three (b) five (c) seven (d) nine CHAPTER 20+21
(1)
In the nuclear reaction 6C11
(a) energy released (2)
11 0 5B + +1 +
(b) neutrino
X X stands for
(c) 1H1
(d) -ray
One sixteenth of the initial amount of radioactive isotopes remains unchanged after two hours. The half life of isotope is
(a) 15 min (3)
(b) 45 min
The most stable nuclei is
(c) 30 min
(d) 60 min
(a) Helium (4)
(6)
(7)
(9)
(10)
(d) 510 meV
(b) ionization of charged particle
(c) gas used in a detector
(d) all of these
Interaction of nuclear radiation with matter depends upon
(a) mass of the particle
(b) energy of the particle
(c) charge of the particle
(d) all of these
Range of , and particle in matter is
(b) > >
(c) > >
(d) > >
Solid state detector is operated on
(a) forward biased
(b) reverse biased
(c) may be forward may be reversed
(d) no biasing at all
The magnitude of pulse in a solid state detector depends upon
(a) energy of charged particle
(b) charge of charged particle
(c) mass of charged particle
(d) none of these
The best place to store nuclear waste is
(b) canals
(c) old salt mines
(d) Coal mine
(c) M series
(d) N series
Which of the series is more energetic
(a) K series (12)
(c) 931 MeV
(b) 0.5 KeV
(a) voltage applied
(a) oceans (11)
(d) krypton
The working a nuclear radiation detector depends upon
(a) > > (8)
(c) uranium
Rest mass energy of an electron
(a) 511 KeV (5)
(b) iron
(b) L series
An atom X is excited to an energy E2 from the ground state Eo by collision with an atom which of the following statements is correct the electron in X lose energy just after collision (II) the excited atom X emits a photon given by hf=E o-E2 (III) the colliding atom must have lost energy to excite X
(a) all are correct (13)
(b) II and III
(c) I and III
(d) III only
The spacing of an atomic layers in a crystal can be measured using x-rays wavelength in meter of the order of
(a) 10-6 (14)
(15)
(16)
(b) 10-7
(c) 10-9
(d) 10-10
X-rays are produced by energy changes in
(a) the nucleus
(b) electron close to the nucleolus
(c) electrons far from nucleus
(d) electrons and protons
The half life of radon gas is 60 sec. This can be changed by
(a) mixing with another radioactive gas
(b) heating radon
(c) increasing pressure
(d) none of these
Which is of the following is good nuclear fuel
(a) neptunium 239
(b) uranium 236
(c) plutonium 239
(d) thorium 236
(17)
Starting with a sample of pure
66
Cu,
7 8
of it decays into Zn in 15 minutes the
corresponding half life is
(a) 10 min (18)
An
4
X + 2He
y
(a) x=90, y=39 (19)
(c) 5 min
(d)
7
1 2
min
-particle incident on a nuclide X produces nuclide Y and two 88
37
(b) 15 min
-particles
x
Y + 2β which is correct?
(b) x=92, y=39
(c) x=92, y=41
(d) x=90, y=38
Freshly prepared radioactive sample of half life 1 hour emits radiations that are 128 times as intense as the permissible safe limit. The minimum time after which the sample can be safely used is
(a) 14 h (20)
(b) 7 h ( b) Fusion
(b) baryons (b) 10-10m (b) neutrino
He
4
z
14
N
a
8O 1
(a) 17, 7 A
z 1Y
(a) ,,
Li
6
(d) neutron
1
H
(b) 7, 17 A
z
(c) 13, 6
Z
A4
1
(b) ,, 9
4 Be ?
(a) 2He4
(d) 6, 13
z
Y
A 4
1
(c) ,,
(d) , ,
1
1
H
(b) 1H1
(c) on1
(d) 1H3
Number of electrons in the nucleus of 92U235 are
(a) 235 (28)
(c) antineutrino
What is the missing nuclei in the following reaction 3
(27)
(d) statement is wrong
In which sequence the radioactive radiations are emitted in the following nuclear reaction. zX
(26)
(c) 10-15m
What are the values of a and z in the following nuclear reaction 2
(25)
(d) leptons
The emission of -rays is followed by the emission of a
(a) -ray (24)
(c) positrons
Two protons attract each other when the distance between them is nearly
(a) 10-1m (23)
(c) chemical reaction (d) combustion
Nuclear forces arises from continuous exchange of particles known as
(a) mesons (22)
(d) 256 h
The source of energy in sun and star is
(a) fission (21)
(c) 128 h
(b) 92
(c) 91
(d) none of these
(b) Leptons
(c) Baryons
(d) Photons
Electrons are
(a) Hardons
(29)
When an animal dies each gram of carbon in its body emits about 16 particles each minute. Each gram of carbon from some animal remains is found to emit 4 particles per minute. How old is the animal (Half life of radioactive carbon is 6000 years)
(a) 3000 years (30)
(33)
(b) 4Be9
(c) 2He4
(d) 3Li7
(b) two
(c) three
(d) no neutron is emitted
The damage of ozone layer is mainly due to release of
(a) carbon mono oxide
(b) chloroflouro carbons
(c) methane
(d) ethane
Which radiation should be used for treatment of infection in the interior
(a) -rays (34)
(d) 18000 years
In proton – proton cycle number of neutrinos emitted are
(a) one (32)
(c) 12000 years
Which of the following nuclides has equal number of neutrons and protons
(a) 1H1 (31)
(b) 6000 years
(b) -rays
(c) -rays
(d) all of these
An electron in a hydrogen like atom is in excited state. It has a total energy of – 3.4eV. Its kinetic energy is
(a) 3.4eV (35)
(b) neon
(39)
(41)
(d) none of these
(c) electron
(d) neutrons
(b) two
(c) three
(d) four
X-ray region lies between
(a) -rays and visible region
(b) -rays and ultraviolet
(c) radio waves and visible region
(d) both “b” and “c”
Life time of metastable excited states is
(a) 10-8sec (40)
(c) argon
Number of series of Bohr’s atom lies in ultraviolet region are
(a) one (38)
(d) – 6.8 eV
Positive rays are
(a) electromagnetic waves (b) ions (37)
(c) – 3.4eV
In helium neon laser active medium
(a) helium (36)
(b) 6.8 eV
(b) 10-3sec
(c) 10-5 sec
(d) 10-2 sec
In Bohar model of hydrogen atom. In going from lower to higher orbit
(a) P.E decrease, T.E decreases
(b) P.E decrease, T.E increase
(c) P.E increases T.E increases
(d) P.E increases T.E remains constant
The diagram shows a narrow beam of charged particles entering a uniform magnetic field. What type of radiations does the beam contain
(42)
(a) -particles and particles
(b)-particles and -particles
(c) -particles only
(d) -particles only
The uranium atom 92U238 emits an
particle to become thorium, which then emits a
-particles to become protactinium. What is the proton number of protactinium
(a) 89 (43)
(b) 91
(c) 95
(d) 85
Nuclide 90X225 decays to nuclide Y with the emission of two particles and one -particle. What is the composition of Y?
(a) 89Y221 (44)
(b) 85Y217
(45)
1
o
n
(c) 1 H
2
14
N
7
1
2
H
(50)
as a result
17
8
O
is formed. The particle emitted is
(c) electron
(d) positron
C
1
1
H
4
(b)
3
1
H
2
o
He 1 B
(d) none of these
Curie is a unit of
(b) half life
(c) radioactivity
(d) intensity of -rays
(c) Rad
(d) None of these
(c) N – 14
(d) Co-60
S.I unit of absorbed does of radiation are
(b) Gray
To cure thyroid cancer we use
(a) Na – 24 (49)
14
6
2 He
(a) Curic (48)
N
(b) proton
(a) energy of -rays (47)
7
(d) 86Y216
Which of the following is a fusion reaction
(a)
(46)
14
Particle is bombarded on
(a) neutron
(c) 87Y217
(b) Iodine – 131
In a nuclear reactor cadmium rods are used to
(a) slow down neutrons
(b) absorb neutrons
(c) speed up neutrons
(d) produce neutrons
A free proton is
(a) stable
(b) unstable
(c) some times stable and some time unstable (d) All of these
1.if a person moves 4m northward,then turn right and move 3m then again turn right and move 6m,then take a U turn and move 2m. a.3m b.4m c.5m
d.6m 2.integrate 1/6 (3t + 2)^1/2 3.the angle of the triangle present inside a semicircle is? 4.if we give some charge to soap bubble then it will decrease or increase? 5.si unit of mass is?? 6.time period of sin3x is? 7. pie/2 is time period of sinx.sin2x,sin3x or sin4x?? 8.sinxcosx=1/4, find x?? 9.sinx=30 then find tan2x. 10.benzene have some directing groups, which are those groups? 11.realation b/w ionization energies of gropu 1A and 2A 12.trends of melting and boiling point? 13.hydration means? 14.KOH is more basic then NAOH? 15.boron form ionic compounds, non ionic compounds, no compounds or perfect cation?? 16.CO2 is polar, non polar, linear diatomic molecule? 17.CO2, CO, etc in which of the following compound carbonhas zero oxidation state? 18.phosphorus has how many allotropic forms? 19.bleaching powder formula?? 20.why noble gases do not give reactions? 21. CH2-O-CH3 and CH2-CH2-OH, type of isomerism 22.alcohol don not react with SOCL3,PI3,HBR etc :P 23.a body of mass 200 kg moving with velocity 20 m/s in a radius 10 m then the required force to move the body in circle is??
24.A,B,C,D,E are student ssitting in a row facing west, A and B are sitting in the front row in such a way that A is on the south, D is sitting behind A, C is sitting 2m on the left of D, now if E is present east-south to A then tell that E is north-east to which student?: :P 25.sec^2 x + cosec^2 x = ?? alright don't eat me if any answer is wrong but please tell me the wrong ones..
1- 3m
Answers
2- (1/27) (3t+2)^(3/2) 3- its always a right angled triangle => 90° 4- (didn't get the question... what will increase or decrease charge or size of bubble?!?! ) 5- kg 6- [2(pi)]/3 7- sin(4x) 8- 15° 9- (question is wrong, range of sine is less than 1 i guess) most probably question is sin 30° = x than find tan 2x in this case answer is ±v3 (depending in which quadrant) 10- ortho, meta. para? 11- group 1A elements have more ionization enery than 2A. cuz its very difficult to remove an electron from its outermost shell since it has only 1 and is being pulled by the positive charge of the proton etc.. 12- decreases from top to bottom and increases from left to right in the periodic table. 13- process of adding water to something... like hydrating something... 14- Na is less electronegative than K, so NaOH will more willingly release -OH group thats wh y NaOH is a stronger base... (i am 50% for KOH & 50% for NaOH, not sure about this answer, this is my best guess) 15- non-ionic compounds 16- linear diatomic molecule
