http://iitscholars.com http://iitvidya.com http://iitscholar.com PHYSICS 1. 2. 3. 4. 5. Two bulbs have the ratings 40 W, 250 V , and 20 W -110 V. The ratio of their resistances is (A) 1 : 2 (B) 1 : 1 (C) 2 : 1 (D) 1 : 4 In the circuit shown below the 10 Ohm resistor develops 10 cal/s due to the current flowing through it . the heat developed per second in the 9 ohm resistor is (A) 4 Cal (B) 16 Cal (C) 8 Cal (D) 32 Cal If R 1 and R 2 are respectively the filament resistances of a 200 W and a 100 W bulb designed to operate on the same voltage, then (A) R1 2R 2 (B) R 2 2R1 (C) R1 4R 2 (D) R 2 4R1 You are given a resistance coil and a battery. In which of the following cases is largest amount of heat generated ? (A) When the coil is connected to the battery directly. (B) When the coil is divided into two equal parts and both the parts are connected to the battery in parallel. (C) When the coil is divided into four equal parts and all the four parts are connected to the battery in parallel (D) When only half the coil is connected to the battery Two bulbs which consume powers P1 and P2 are connected across same source. The power consumed by the combination if they are connected in series is (A) P1 P2 (B) P1P2 (C) 6. P1P2 P1 P2 (D) 2P1P2 P1 P2 Two identical heaters produce heat H1 in time t when connected in parallel across the main supply. They produce heat H 2 in time t when connected in series. Then H1 / H 2 is 7. (A) 1/ 4 (B) 4 (C) 1/ 2 (D) 2 When a battery sends current through a resistance R 1 and for time t, the heat produced in the resistance is Q. When the same battery sends current through another resistance R 2 for time t, the heat produced in R 2 is again Q. The internal resistance of the battery is http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 8. 9. 10. 11. 12. 13. 14. 15. 16. (A) R1 R 2 2 (C) R1R 2 R1 R 2 2 R1R 2 (D) 2 (B) A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if (A) both the length and radius of the wire are halved (B) both the length and radius of the wire are doubled (C) the radius of the wire is doubled (D) the length of the wire is doubled If the current in an electric bulb drops by 1% , the power decreases by (A) 1% (B) 2% (C) 4% (D) 0.5 % An 800 W, 220 V kettle and three 100 W , 220 V bulb are connected in parallel across 220 V source. The current drawn from the source is (A) 0.15 A (B) 5.0 A (C) 5.5 A (D) 6.9 A Water boils in an electric kettle in 15 minutes. If the length of the heating coil is reduced to 2/3 of its initial value, then the same amount of water will boil in (A) 15 Min (B) 12 Min (C) 10 Min (D) 8 Min What is immaterial for an electric fuse wire ? (A) its specific resistance (B) its radius (C) its length (D) current flowing through it The thermo-emf of a thermo-couple is 40 V per degree. The smallest temperature difference that can be detected with this couple and a galvanometer of 100 resistance capable of measuring the minimum current of 1A is . (A) 10 C (B) 1.50 C (C) 20 C (D) 2.50 C Which is independent of the temperature of the cold junction (A) inversion temperature (B) neutral temperature (C) both inversion and neutral temperatures (D) neither inversion nor neutral temperature. The amount of energy absorbed or evolved at a junction when a current of 1 ampere flows through it for 1 second is called (A) Seeback coefficient (B) Thomson coefficient (C) Peltier coefficient (D) None of these 1 2 The emf developed in a thermocouple is given by V T T 2 , where T is the temperature of the hot junction, the cold junction being at 00 C . The thermo electric power of this couple is (A) T (C) / 17. T 2 (D) 2 / (B) One junction of a thermocouple is at 00 C and the other is at T 0C . The thermo-emf (in volts) is given by V 20 106 T 0.02 106 T2 . The maximum value of V is (A) 5mV (B) 1mV (C) 10mV (D) Zero http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 18. The cold junction of a thermocouple is at 00 C and the thermo-emf (in volts) as a function of 1 6 2 10 t . The neutral 40 the temperature t of the hot junction is given by V 10 106 t temperature and the maximum value of the emf are (A) 2000 C,2mV (B) 4000 C,2mV 19. 20. (C) 1000 C,1mV (D) 2000 C,1mV The chemical equivalents of copper and silver are 32 and 108 respectively. When copper and silver voltmeters are connected in series and electric current is passed through them for some time, 1.6 g of copper is deposited. The amount of silver deposited is (A) 0.47 g (B) 5.4 g (C) 1.6 g (D) 2.7 g If N is the Avogardro’s number and e is the electronic charge , tehn the Faraday constant F is equal to (A) Ne (B) N 2e (C) Ne2 21. 22. 23. 24. 25. 26. 27. (D) 1 Ne In a copper voltmeter, the mass deposited in 30 s in m grams . If the current-time graph is as shown in the figure, the electrochemical equivalent of copper, in g/C, is (A) 0.1 m (B) 0.6 m (C) m/2 (D) m A copper voltameter has a resistance of 1 . It is connected is series with a 2 V battery and a resistor of 2 . The mass of Cu deposited in 1 hour is ( ece of Cu = 0.00033 g/C) (A) 0.2 g (B) 0.4 g (C) 0.6 g (D) 0.8 g For a given temperature difference, which of the following pairs will generate maximum thermo-emf ? (A) antimony-bismuth (B) Silver-gold (C) iron-copper (D) lead-nickle Which of the following statements is correct ? (A) Both Peltier and Joule effects are reversible (B) Both Peltier and Joule effects are irreversible (C) Joule effect is reversible, whereas Peltier effect is irreversible (D) Joule effect is irreversible, whereas Peltier effect is reversible A thermocouple is made from copper and iron. At the hot junction, current (A) flows from copper towards iron (B) flows from iron towards copper (C) flow decreases (D) flow increases If a wire of resistance 20 is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is (A) 0.97 gm/s (B) 2 gm/s (C) 6.7 gm/s (D) None of these A battery of e.m.f 10 V and internal resistance 0.5 is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by (A) 0.2 (B) 0.25 http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 28. (C) 1.0 (D) 0.5 When 2 equal resistances are connected in parallel to the poles of a cell of negligible internal resistance , the power developed is P, when the same resistances are connected in series across the same cell, the power developed is (A) P (C) 29. 30. 31. 32. (B) P 4 (D) 4P As the temperature of hot junction increases , the thermo-emf (A) always increases (B) always decreases (C) may increases or decrease (D) always remains constant Two ends of a conductor are at different temperatures. The electromotive force generated between two ends is (A) Seebeck electromotive force (emf) (B) Pletier electromotive force (emf) (C) Thormson electromotive force (emf) (D) None of the above A electron is moving in a circle of radius r in a uniform magnetic field B. Suddenly the field is reduced to B/2. The radius of the circle now becomes (A) r / 2 (B) r / 4 (C) 2r (D) 4r Two particles X and Y having equal charge, after being accelerated through the same potential diffence, enter a region of uniform magnetic field and describe circular paths of radii R 1 and R 2 respectively. The ratio of the mass of X to that of Y is (A) R1 / R 2 1/ 2 (C) R1 / R 2 33. 34. 35. 36. 1 4 (C) 2 38. 2 (B) R 2 / R1 (D) R1 / R 2 An electric current is flowing in a long straight wire. The magnetic field due to this current at a distance of 5 cm from the wire is 10 gauss. The magnetic field at a distance of 10 cm from the wire is (A)2.5 gauss (B) 5 gauss (C) 20 gauss (D) 40 gauss The current sensitivity of a moving coil galvanometer independent of (A) the number of turns in the coil (B) moment of inertia of the coil (C) strength of the magnetic field (D) torsional constant of the suspension fibre Two concentric coils carry the same current in opposite directions. He diameter of the inner coil is half that of the outer coil. If the magnetic field produced by the outer coil at the common centre is 1 tesla, the net field at the centre is (A) 1 T (B) 2T (C) 3 T (D) 4T A circular loop has radius R and a current I flows through it. Another circular loop has radius 2R and a current 2 I flows through it. Ratio of the magnetic fields at their centres is (A) 37. P 2 (B) 1 (D) 4 The path executed by a charged particle whose motion is perpendicular to a magnetic field is (A) straight line (B) curcular (C) elliptic (D) parabolic Magnetic field inside a solenoid is (A) directly proportional to current (B) inversely proportional to current (C) directly proportional to its length (D) inversely proportional to the total number of turns http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 39. 40. A current of 0.1 A circulates around a coil of 100 turns and having a radius equal to 5 cm. The magnetic field set up at the centre of the coil is (A) 4105 T (B) 8105 T ’ (C) 4 105 T (D) 2 105 T A charge q coulomb is circulating in an orbit of radius r metres making n revolutions per second. The magnetic field produced at the centre of the orbit , in N/Am , is 2q 107 nr 2nq (C) 107 r (A) 41. 42. Two parallel long straight conductors are placed at right angles to a metre scale at the 2 cm and 6 cm marks. They carry currents I and 3 I respectively in the same direction. The resultant magnetic field due to them is zero (A) at the 3 cm mark (B) at the 4 cm mark (C) at the 5 cm mark (D) nowhere Two long straight wires , carrying currents I1 and I 2 are placed perpendicular to each other. The line of shortest distance between them, PQ has length r. The magnitude of the magnetic field at the centre O of PQ is 0 I0 I 2 r 1/ 2 (C) 0 I12 I 22 r (A) 43. 44. 0 I0 I 2 r (D) 0 I12 I 22 2r (B) 1/ 2 A proton and an - particle enter a magnetic field normally. If the force experienced by the proton is double of that experienced by the -particle, the ratio of their speeds is (A) 0.5 (B) 1 (C) 2 (D) 4 A metal rod of mass 10 g and length 10 cm is placed on a smooth 600 incline. A uniform magnetic field B is applied in the region vertically downwards. If a current of 3 A is passed through the rod then the value of B for which the rod remains stationary on the inclined plane is (A) 3 T (C) 45. 2q 107 r 2rn (D) 107 q (B) 3T 1 T 3 1 (D) T 3 (B) A charged particle having kinetic energy E enters normally a region of uniform magnetic field between two planes P1 and P2 as shown in the figure. If the particle just misses hitting the plate P2 , then the magnetic field B in the region between the plates is http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com (A) (C) 46. 47. 48. 50. mE 2qd (B) 2mE qd (D) 2mE qd The time period of oscillation of a freely suspended magnet is 4 s. If it is broken in length into two equal parts and one part is suspended in the same way, its time period will be (A) 4 s (B) 2s (C) 0.5 s (D) 0.25 s A compass needle of magnetic moment 60A m2 , pointing geographic north at a place where the horizontal component of earth’s magnetic field is 40Wb / m2 experiences a torque if 1.2 103 N m . The declination of the place is (A) 150 (B) 300 (C) 450 (D) None of the above A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 600 . The torque required to maintain the needle in this position is (A) 49. mE 2qd 3W 3 W 2 (D) 2W (B) (C) W All the magnetic materials lose their magnetic properties when (A) dipped in water (B) dipped in oil (C) broght near a piece of iron (D) strongly heated Two small magnets, each of magnetic moment 10A m2 , are placed in end-on position 0.1 m apart from their centres. The force acting between them is (A) 0.6 107 N (B) 0.06 107 N (C) 0.6N (D) 0.06N CHEMISTRY 51. 52. 53. Which one of the following will be most basic ? (A) Aniline (B) p-Methoxyaniline (C) p-Nitroaniline (D) Benzylamine Which of the following reagent can be used to convert benzenediazonium chloride into benzene ? (A) CH3OH (B) H3PO2 / H2O (C) Br2 H2O (D) LiAlH 4 Benzenediazoium chloride on reaction with phenol in weakly basic medium gives (A) Diphenyl ether (B) p-Hydroxybenzene (C) Chlorobenzene (D) Benzene http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com CH 3 54. (CH3CO)2O H+/H2O Br2/CH3COOH A B X, the product ‘X’ is NH 2 (A) CH 3 (B) CH3 Br Br (C) NH 2 CH 3 (D) NH2 CH 3 CO CH 3 CO CH 3 NH 2 55. NH 2 The major product (70% to 80%) of the reaction between m-dinitrobenzene with NH 4HS is (A) NO 2 NO 2 (C) NO 2 (B) NO 2 HS NH 2 NH 2 (D) NO 2 NH 2 HS 56. The Product ‘D’ of the reaction KCN H / H2O NH3 CH3Cl A B C D is (A) CH3CH2 NH2 (B) CH3CN (C) HCONH2 (D) CH3CONH 2 57. The reaction of chloroform with alcoholic KOH and p-toluidine forms (A) (B) H3C CN H3C NHCHCl 2 (C) 58. H3 C N2Cl H3C NC (D) ‘Z’ in the following sequence of reactions is http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com C 6 H6 HNO3/H2SO4 Zn/HCl W NaNO2 X Y HCl 59. 60. H2O/H3PO2 Z (A) COOH (B) (C) OH (D) Cl Aniline is reacted with bromine water and the resulting product is treated with an aqeous solution of sodium nitrite in presence of dilute HCl. The compound so formed is converted into tetrafluoroborate which is subsequently heated dry. The final product is (A) p-Bromofluorobenzene (B) p-Bromoaniline (C) 2,4,6- tribromofluorobenzene (D) 1,3,5-Tribromobenzene Which of the following sequence of reactions will give m-bromo aniline ? (A) 1. Br2/FeBr3 H2/Pt 2. HNO3/H2SO4 (B) COOH (C) Br2 (1) SOCl2 Br2 FeCl3 (2) NH3 NaOH 1.HNO3/H2SO4 Br2/H2O 2. Sn+HCl (D) + N2 Cl - CuBr/HBr 61. Which of the following reagents will be useful to distinguish between H3C NH 2 and CH 2NH 2 ? (A) Dilute HCl (B) C6H5SO2Cl and OH / H 2O (C) HONO then -naphthol http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com (D) 62. AgNO3 in H 2O Which of the following is the strongest base ? NH 2 (A) (C) NH 2 (B) (D) NH NO 2 NH 63. Which of the following gives propylamine upon hydrolysis ? (A) CH3CH2C N (B) CH3CH2CH2 2 NH (C) O CH 3 (D) C NH CH 2 CH 2 CH 3 CH3CH2 CH NH CH3Br 64. CH 2CN In the reaction CH 3 (A) CH (C) 65. 66. NaNH2,NH3-80 °C the products obtained are (B) C CH 2 NH 2 N (D) None CH 2 OH Which of the following statement is correct ? (A) Ammonia is more basic than methylamine (B) Methyl amine is more basic than ammonia (C) Dimethylamine is less basic than methylamine (D) Dimthylamine is less basic than trimethylamine The product (C) of the following series of reactions is NH 2 Cl NaNO2,HCl H2O, 0°C (A) O C CH 3 Cl (1) CH3MgBr CuCN (B) (A) (B) COOCH3 Cl http://iitscholars.com http://iitvidya.com http://iitscholar.com (2) H2O,H+ (C) http://iitscholars.com http://iitvidya.com http://iitscholar.com (C) OH CH 3 CH CH 2 CN (D) Cl 67. Cl Which of the following is the strongest base ? (A) (B) NHCH 3 NH 2 CH 3 (C) (D) NH 2 68. CH 2NH 2 Formation of polyethylene from calcium carbide takes place as follows CaC2 2H2O Ca OH 2 C2H2 C2H2 H2 C2 H 4 nC2H4 CH2 CH2 n 69. 70. The amount of polyethylene obtained from 64 kg of CaC2 is (A)7 kg (B) 14 kg (C) 21 kg (D) 28 kg Violet colour is obtained when dilute CuSO4 is added in alkaline solution of protein. This test is known as (A) Biuret (B) Xanthoproteic test (C) Hopkins–cole (D) Millon’s test Which one of the following monomers gives the polymer neoprene on polymerization ? (A) CCl2 CCl2 Cl (B) CH2 71. 72. (C) CF2 CF2 Plexiglas (PMMA) is a polymer of (A) Acrylic acid (C) Methyl methacrylate (D) C CH CH2 CH2 CHCl (B) Methyl acrylate (D) Acrylonitrile Which compound/set of compounds is used in the manufacture of nylon-66 ? (A) HOOC CH2 4 COOH H2 N CH 2 6 NH 2 (B) (C) CH2 CH2 (D) CH2 CH C CH CH2 HOOC COOH + HOCH CH OH 2 2 73. 74. Polymer obtained by condensation polymerization is (A)Polythene (B) Teflon (C) Phenol-formaldehyde (D) Nitrile rubber Natural rubber is a polymer of (A) Butadiene (B) Ethylene (C) Styrene (D) Isoprene http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 75. 76. 77. 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. Glucose molecule reacts with X number of molecules of phenylhydrazene to yield osazone. The value of X is (A) Three (B) Two (C) One (D) Four Which of the following does not reduce Benedict’s solution ? (A) Glucose (B) Fructose (C) Sucrose (D) Aldehyde Hydrolysis of sucrose gives (A) Two molecules of glucose (B) Two molecules of fructose (C) One molecule each of glucose and fructose (D) One molecule each of glucose and manose The term invert sugar refers to an equimolar mixture of (A) D-glucose and D-galactose (B) D-glucose and D-fructose (C) D-glucose and D-mannose (D) D-glucose and D-ribose Cellulose is a polymer of (A) glucose (B) fructose (C) ribose (D) sucrose Which amino acid is achiral ? (A) alanine (B) valine (C) proline (D) Glycine Peptides on hydrolysis give (A) Amines (B) Amino acids (C) Ammonia (D) Alcohols The helical structure of proteins is stabilized by (A) H-bonding (B) van der Waals forces (C) ionic bond (D) peptide bond The enzyme which converts glucose and fructose into ethyl alcohol is (A) Diastase (B) Invertase (C) Sucrose (D) Zymase D - glucose and D -glucose are (A) enantiomers (B) geometrical isomers (C) epimers (D) anomers The rapid interconversion of D -glucose and D -glucose in solution is known as (A) Racemization (B) Asymmetric induction (C) Fluxional isomerism (D) Mutarotaiton In an amino acid, the carboxyl group ionizes at pK a1 2.34 and ammonium ion at pK a 2 9.60 . The isoelectric point of the amino acid is at pH (A)5.97 (B)2.34 (C) 9.60 (D) 6.97 If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be (A) TACGAACT (B) TCCGAACT (C) TACGTACT (D)TACGTAGT RNA is different from DNA because RNA contains (A) ribose sugar and thymine (B) ribose sugar and uracil (C) deoxyribose sugar and thymine (D)deoxyribose sugar and uracil Which of the following is a example of co-polymer ? (A) Buna-S (B) PAN (C) Polythene (D) PTFE http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 90. 91. Luminal, a barbiturate drug is used as a/an (A) antihistamine (B) sedative (C) antiseptic (D) antimalarial The correct structure of the drug paracetamol is (A) OH (C) CONH 2 Cl (B) (D) NHCOCH 3 Cl COCH 3 CONH 2 92. OH Which of the following amine will not respond to carbylamines reaction ? (A) Ethylamine (B) CH3 2 NH (C) 93. 94. (D)Phenylamine CH3 NH2 How many isomeric forms of C7 H9 N contain a bezene ring ? (A) 4 (B) 5 (C) 6 (D) 7 Which of the following can be prepaired by Gabriel phthalimide reaction C6 H5 NH CH3 (A) (C) (B) CH3 CH2 NH2 (D) CH3 CH3 N NH CH3 95. The reactivity of diazonium salt for coupling with the following compound is in the order O - I 96. CH3 CH3 OH NH 2 + NH 3 II III IV (A) IV<II<III<I (C) II <IV<I<III The strongest base among the following is (A) (B) IV>III<II<I (D) I<II<III<IV (B) N H N (C) (D) NH 2 N H http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 97. 98. 99. 100. Glyptal is a polymer of (A) ethylene glycol (B) ethylene glycol and phthalic acid (C) ethylene glycol and adipic acid (D) carprolactum Caprolactum polymerises to give (A) Terylene (B) Teflon (C) Gluptal (D) Nylon-6 Alizarin belongs to the class of (A) Vat dyes (B) Mordant dyes (C) Basic dyes (D) Reactive dyes Which of the following is a broad spectrum antibiotic (A) Paracetamol (B) Penicillin (C) Aspirin (D) Chloramphenicol MATHEMATICS 101. 102. The value of cos100 sin100 is (A) Positive (B) Negative (C) 0 (D) 1 2 4 Given A sin cos , then for all real 3 A 1 4 3 13 (D) A 4 16 (A) 1 A 2 (C) 103. (B) 13 A 1 16 The equation a sin x bcos x c , where c a 2 b2 has (A) a unique soln (C) no soln 104. Suppose that sin 3 x sin 3x (B) Infinite no. of Solns (D) None of these n c m 0 m cos mx is an identity in x , where c1,c2 ,c3....,cn are constants and cn 0 . Then the value of n is (A) 4 (B) 5 (C) 6 (D) 8 105. The maximum value of 5cos 3cos (A) 5 (C) 11 106. 107. 108. 3 is 3 (B) 10 (D) -11 The value of 3 cosec200 sec200 is equal to (A) 2 (B) 1 (C) 4 (D) -4 2 2 If sin x sin x 1 , then value of cos x cos 4 x is (A) 1 (B) 2 (C) 1.5 (D) None of these 5 7 sin sin is 18 18 18 The value of sin 1 1 (B) 2 4 1 1 (C) (D) 8 16 If cos x tan y,cos y tan z,cos z tan x , then the value of sin x is (A) 109. (A) 2cos180 (B) cos180 http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com (C) sin180 (D) 2sin180 110. The value of tan90 tan 270 tan 630 tan810 is (A) 2 (B) 3 (C) 4 (D) None of these 111. If 0 A 112. 113. 114. 7 A and sin A cos A , then tan 6 2 2 7 2 7 2 (A) (B) 3 3 7 (C) (D) None of these 3 3 A 5A If cos A , then the value of sin sin is 4 2 2 11 1 (A) (B) 8 32 11 11 (C) (D) 16 32 The general value of satisfying the equation 2sin 2 3sin 2 0 is n n (A) n 1 , n I (B) n 1 , n I 6 2 n 5 n 7 (C) n 1 (D) n 1 ,n I ,n I 6 6 The most general value of , satisfying the two equations cos 5 ,n I 4 5 (C) n ,n I 4 (A) 2n 115. The general solution of tan3x 1 is 116. is (A) 2 (C) 6 117. ,n I 4 (D) 2n 1 , n I 4 (B) 2n n ,n I 3 12 (C) n,n I (D) n , n I 4 The number of pairs x, y satisfying the equations sin x sin y sin x y and x y 1 (A) n ,n I 4 1 , tan 1 is 2 (B) (B) 4 (D) infinite tan cos1 x is equal to (A) 1 x2 x (B) (C) 1 x2 x (D) x 1 x2 1 x2 http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 118. 119. 120. 121. 122. 123. 124. 1 1 is equal to 4 tan 1 tan 1 5 239 (A) (B) / 2 (C) / 3 (D) / 4 2 If sin 1 x sin 1 y , then cos1 x cos1 y 3 2 (A) (B) 3 3 (C) (D) 6 7 The value of cos 1 cos is 6 7 5 (A) (B) 6 3 5 13 (B) (D) 6 6 4 2 The value of tan cos 1 tan 1 is 5 3 7 6 (A) (B) 16 17 17 (C) (D) None of these 6 If x 2 , then cos1 cos x is equal to (A) x (B) x (C) 2 x (D) 2 x 1 1 If 4sin x cos x , then x equals 1 3 (A) (B) 2 2 1 (C) (D) None of these 2 The number of real solutions of tan 1 x x 1 sin 1 x 2 x 1 / 2 is (A) zero (C) two 125. (B) One (D) infinite In a ABC , if cos A cos B cos C and the side a 2 , then area of the triangle is a b c (A) 1 126. (B) 2 (C) 3 / 2 (D) 3 The perimeter of a ABC is 6 times the arithmetic mean of the sines of its angles . If the side a is 1, then the angle A is 6 (C) 2 (A) 127. (B) 3 (D) In a triangle ABC , a 4,b 3, A 600 . Then c is the root of the equation (A) c2 3c 7 0 (B) c2 3c 7 0 (C) c2 3c 7 0 (D) c2 3c 7 0 http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 128. 129. 130. In a triangle ABC, if a 13,b 14,c 15 , then its inradius is equal to (A) 4 (B) 8 (C) 2 (D) 6 The ex-radii of a triangle r1 , r2 , r3 are in harmonic progression, then the sides a,b,c are (A) in H.P (B) in A.P (C) in G.P (D) None of these If in a triangle ABC, a 2 b c , then tan A 2 (A) 15/16 (C) 8/17 131. (B) 8/15 (D) 1/ 2 If in a triangle ABC, 3a b c then the value of cot (B) 3 (D) None of these (A) 1 (C) 2 132. In a triangle ABC, if r, r1, r2 , r3 have their usual meanings, the value of (C) 134. 135. 136. (B) 1 r a cos A bcos B ccos C is equal to a bc r R (A) (B) R r 2r R (C) (D) R 2r 2 2 2 2 If in a triangle ABC, 8R a b c , then the triangle ABC is In a triangle ABC, (A) right angled (B) isosceles (C) equilateral (D) None of these The angle of elevation of the top of the tower observed from each of the three points A,B,C on the ground, forming a triangle is the same angle . If R is the circum-radius of the triangle ABC, then the height of the tower is (A) R sin (B) R cos (C) R cot (D) R tan The top of a hill observed from the top and bottom of a building of height h is at angles of elevation p and q respectively. The height of the hill is h cot q cot q cot p h tan p (C) tan p tan q (A) 137. (B) h cot p cot p cot q (D) None of these A tree is broken by wind, its upper part touches the ground at a point 10 metres from the foot of the tree and makes an angle of 450 with the ground. The entire length of the tree is (A) 15 metres (B) 20 metres (C) 10 1 2 metres 138. 1 1 1 is r1 r2 r3 2 r 3 (D) r (A) 1 133. B C cot is 2 2 (D) 10 1 3 metres 2 An aeroplane flying at a height of 300 metres above the ground passes vertically above another plane at an instant when the angles of elevation of the two planes from the same point on the ground are 600 and 450 respectively. The height of the lower plane from the ground (in metres ) is http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 139. 140. (B) (C) 50 (D) 150 3 1 If z 4 2 , then the maximum value of z is z (A) 5 (B) (C) 5 1 (D) None of these 5 1 If z 3 , then the points representing the complex numbers 1 4z lie on a (A) line (C) parabola 141. 100 3 (A) 100 3 (B) Circle (D) Hyperbola If z 2 1 z 1 , then z lies on a 2 (A) circle (C) an ellipse (B) a parabola (D) None of these 1 i The least positive integer n for which is real, is 1 i n 142. 143. (A) 2 (C) 8 The value of 1 1 2 1 3 1 4 1 5 1 6 ...1 3n , imaginary cube root of unity , is (A) 23n (C) 2n 144. (B) 4 (D) None of these where is an (B) 22n (D) None of these If z z z z , then the locus of z is (A) a pair of straight lines (B) a rectangular hyperbola (C) a line (D) a set of four lines 145. If 2z1 3z 2 5z 2 is purely imaginary , then is equal to : 2z1 3z 2 7z1 (A) 5/7 (B) 7/9 25 (C) 49 (D) None of these 146. The locus represented by the equation z 1 z i is 147. (A) a circle of radius 1 (B) an ellipse with foci at 1 and –i (C) a line through the origin (D) a circle on the line joining 1 and –i as diameter The inequality z 4 z 2 represents the region given by 148. (A) Re z 3 (B) Re z 0 (C) Re z 2 (D) None of these If z1, z 2 , z3 are vertices of an equilateral triangle inscribed in the circle z 2 and if z1 1 i 3 , then (A) z 2 2,z3 1 i 3 (B) z 2 2,z3 1 i 3 (C) z 2 2,z3 1 i 3 (D) z 2 1 i 3,z3 1 i 3 http://iitscholars.com http://iitvidya.com http://iitscholar.com http://iitscholars.com http://iitvidya.com http://iitscholar.com 149. Let z and w be two non-zero complex numbers such that z w and arg z arg w . Then z equals (A) w (C) w 150. If z (A) i (C) 1 (B) –w (D) w 3 i , then z 69 equals 2 (B) i (D) 1 ANSWERS PHYSICS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13 14 15 16 17 18 19 20. 21. 22 23. 24 25 26 27 28 29 30 31 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. (C) (B) (B) (C) (C) (B) (C) (B) (B) (B) (C) (C) (D) (B) (C) (A) (A) (D) (B) (A) (C) (C) (A) (D) (A) (C) (D) (C) (C) (C) (C) (C) (B) (C) (A) (B) (B) (A) (A) (C) (A) (C) (D) (D) (D) (B) (B) (A) (D) (C) CHEMISTRY 51. 52. 53. 54. (D) (B) (B) (B) 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. 97. 98. 99. 100. (C) (D) (D) (B) (C) (B) (C) (B) (C) (A) (B) (A) (D) (D) (A) (B) (C) (A) (C) (D) (A) (C) (C) (B) (A) (D) (B) (A) (D) (D) (D) (A) (A) (B) (A) (B) (B) (B) (B) (B) (A) (C) (B) (D) (B) (D) 112. 113. 114. 115. 116. 117. 118. 119. 120. 121. 122. 123. 124. 125. 126. 127. 128. 129. 130. 131. 132. 133. 134. 135. 136. 137. 138. 139. 140. 141. 142. 143. 144. 145. 146. 147. 148. 149. 150. (C) (D) (D) (B) (C) (A) (D) (B) (C) (C) (D) (A) (C) (D) (A) (A) (A) (B) (B) (C) (C) (A) (A) (D) (B) (C) (A) (B) (B) (D) (A) (C) (A) (D) (C) (A) (A) (D) (A) MATHEMATICS 101. 102. 103. 104. 105. 106. 107. 108. 109. 110. 111. (A) (B) (C) (C) (B) (C) (A) (C) (D) (C) (A) http://iitscholars.com http://iitvidya.com http://iitscholar.com
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