# Solved papers for JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

### done Jamia Millia Islamia Solved Paper-2009

• question_answer1) The magnitude of resultant of two equal forces is equal to either of two forces. The angle between forces is

A) $\frac{\pi }{3}$

B) $\frac{2\pi }{3}$

C) $\frac{\pi }{2}$

D) $\frac{3\pi }{4}$

• question_answer2) A particle projected vertically upwards attains a maximum height H. If the ratio of the times to attain a height$h(h<H)$is$\frac{1}{3}$then,

A) $4h=3H$

B) $3h=4H$

C) $3h=H$

D) $4h=H$

• question_answer3) A force vector applied on a body is given by $\overrightarrow{F}=6\hat{i}-8\hat{j}+10\hat{k}$and acquires an acceleration of$1\text{ }m{{s}^{2}}$. Then the mass of the body is

A) $10\sqrt{2}$kg

B) $2\sqrt{10}$

C) $10\,kg$

D) $20\,kg$

• question_answer4) In the adjoining figure, AB,BC and AC are light metallic rods hinged at B. The tension on rod BC is

A) 150 N

B) 180 N

C) 500 N

D) $166\frac{1}{3}N$

• question_answer5) A 2 kg block is dropped from a height of 0.4m on a spring of force constant$k=1960\text{ }N{{m}^{-1}}$. The maximum compression of the spring is

A) 0.1 m

B) 0.2 M

C) 0.3 M

D) 0.4 M

• question_answer6) A solid sphere of mass 2 kg rolls up a$30{}^\circ$incline with an initial speed$10\text{ }m{{s}^{-1}}$. The maximum height reached by the sphere is$(g=10\text{ }m{{s}^{-2}})$

A) 3.5m

B) 7.0m

C) 10.5m

D) 14.5m

• question_answer7) A body is moving in a vertical circle of radius r such that the string is just tout at its highest point. The speed of the particle when the string is horizontal is

A) $\sqrt{gr}$

B) $\sqrt{2gr}$

C) $\sqrt{3gr}$

D) $\sqrt{5gr}$

• question_answer8) In some region, the gravitational field is zero. The gravitational potential in this region

A) may be zero

B) cannot be zero

C) must be change

D) None of these

• question_answer9) Some gas at 300K is enclosed in a container. Now, the container is placed on a fast moving train. While the trains is in motion, the temperature of gas

A) rises above 300K

B) falls below 300K

C) remains unchanged

• question_answer10) The ratio of the adiabatic bulk modulus to the isothermal bulk modulus of a perfect gas is equal to (symbols have their usual meanings)

A) ${{C}_{p}}-{{C}_{V}}$

B) $\frac{{{C}_{P}}}{{{C}_{V}}}$

C) $\frac{{{C}_{V}}}{{{C}_{P}}}$

D) $\sqrt{\frac{{{C}_{P}}}{{{C}_{V}}}}$

• question_answer11) The volume of a block of metal changed by 0.12% when heated through$20{}^\circ C$. Then a is

A) $2.0\times {{10}^{-5}}/{}^\circ C$

B) $4.0\times {{10}^{-5}}/{}^\circ C$

C) $6.0\times {{10}^{-5}}/{}^\circ C$

D) $8.0\times {{10}^{-5}}/{}^\circ C$

• question_answer12) A simple pendulum has time period T. The pendulum is completely immersed in a non-viscous liquid whose density is one-tenth of that of the material of the bob. The time period of the pendulum immersed in liquid is

A) $T$

B) $\sqrt{\frac{9}{10}}T$

C) $\sqrt{\frac{10}{9}}T$

D) $\frac{T}{10}$

• question_answer13) How many times more intense is a 90 dB sound than a 40 dB sound?

A) 2.5

B) 5

C) 50

D) ${{10}^{5}}$

• question_answer14) The minimum distance of a reflector to hear the echo of monosyllabic sound is (speed of sound is$330\text{ }m{{s}^{-1}}$)

A) 16.5 m

B) 33 m

C) 165 m

D) 330m

• question_answer15) If$X=\frac{{{\varepsilon }_{0}}lV}{t},$where${{\varepsilon }_{0}}$is the permittivity of free space,$l$is light, V is potential difference and$t$is time. The dimensions of$X$are the same as that of

A) charge

B) resistance

C) voltage

D) current

• question_answer16) An electric dipole placed in a uniform electric field will have minimum potential energy when the dipole moment is inclined to the field at an angle

A) $\pi$

B) $\frac{\pi }{2}$

C) zero

D) $\frac{3\pi }{2}$

• question_answer17) In the figure, the equivalent capacitance between A and B is

A) $3.75\text{ }\mu F$

B) $5.25\text{ }\mu F$

C) $6.5\text{ }\mu F$

D) $10.5\text{ }\mu F$

• question_answer18) Potential at appoint at a distance r from the centre of uniformly charged sphere of radius a $a(<r)$ is proportional to

A) ${{a}^{3}}$

B) r

C) $\frac{1}{r}$

D) $\frac{1}{{{a}^{3}}}$

• question_answer19) If we add impurity to a metal those atoms also deflect electrons. Therefore,

A) the electrical and thermal conductivity both increase

B) the electrical and thermal conductivity both decrease

C) the electrical conductivity increases but thermal conductivity decreases

D) the electrical conductivity decreases but thermal conductivity increases

• question_answer20) The voltage V and current$I$graph for a conductor at two different temperatures${{T}_{1}}$and${{T}_{2}}$are shown in figure. The relations between${{T}_{1}}$and${{T}_{2}}$is

A) ${{T}_{1}}>{{T}_{2}}$

B) ${{T}_{1}}<{{T}_{2}}$

C) ${{T}_{1}}={{T}_{2}}$

D) ${{T}_{1}}\approx {{T}_{2}}$

• question_answer21) $1\,Wb/{{m}^{2}}$is equal to

A) $10{{\,}^{4}}G$

B) $10{{\,}^{2}}G$

C) $10{{\,}^{-2}}G$

D) $10{{\,}^{-4}}G$

• question_answer22) A bar magnet has coercively$4\times {{10}^{3}}A\text{ }{{m}^{-1}}$. It is desired to demagnetize it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is

A) 2 A

B) 4A

C) 6 A

D) 8 A

• question_answer23) A thyroidal solenoid with an air core has an average radius of 15 cm, are of cross-section 12cm2 and 1200 turns. Ignoring the field variation across the cross-section of the toroid the self-inductance of the toroid is

A) 4.6 mH

B) 6.9 mH

C) 2.3 mH

D) 9.2 mH

• question_answer24) If$\phi$is phase difference between current and voltage the wattless component of current is

A) $I\,\cos \phi$

B) $I\sin \phi$

C) $I\tan \phi$

D) $I{{\cos }^{2}}\phi$

• question_answer25) To double the covering range of a TV transmitter tower, its height should be made

A) 2 times

B) 4 times

C) V2 times

D) 8 times

• question_answer26) A bulb is placed between two plane mirrors inclined at an angle of$60{}^\circ$. The number of images formed is

A) 5

B) 6

C) 4

D) 3

• question_answer27) Two plane mirrors are placed perpendicular to each other. A ray strikes one mirror and after reflection from the second mirror will be

A) perpendicular to the original ray

B) parallel to the original ray

C) at$45{}^\circ$to the original ray

D) can be at any angle to the original ray

• question_answer28) An electron moving with velocity$2\times {{10}^{7}}m{{s}^{-1}}$ describes a circle in a magnetic field of strength$2\times {{10}^{-2}}T$.If$\left( \frac{e}{m} \right)$of electrons is$1.76\times {{10}^{11}}K\,k{{g}^{-1}},$then the diameter of the circle is nearly

A) 1.1 cm

B) 1.1 mm

C) 1.1 m

D) 11 cm

• question_answer29) A neutron is confined to a nucleus of size${{10}^{-14}}m$. The minimum momentum of the electron may be

A) $6.6\times {{10}^{-20}}kg\text{ }m{{s}^{-1}}$

B) $3.3\times {{10}^{-20}}kg\text{ }m{{s}^{-1}}$

C) $3.3\times {{10}^{-48}}kg\text{ }m{{s}^{-1}}$

D) $6.6\times {{10}^{-48}}kg\text{ }m{{s}^{-1}}$

• question_answer30) An electron makes transition inside a hydrogen atom. The orbital angular momentum of the electron may change by

A) $h$

B) $\frac{h}{3\pi }$

C) $\frac{h}{2\pi }$

D) $\frac{h}{4\pi }$

• question_answer31) If 1 mg of${{U}^{235}}$is completely annihilated, the energy liberated is

A) $9\times {{10}^{10}}J$

B) $9\times {{10}^{19}}J$

C) $9\times {{10}^{18}}J$

D) $9\times {{10}^{17}}J$

• question_answer32) The transfer ratio$\beta$of a transistor is 50. The input resistance of the transistor when used in the common emitter mode is$1\,k\Omega$. The peak value of the collector alternating current for an input peak voltage of 0.01 V is

A) $100\text{ }\mu A$

B) $\text{500 }\mu A$

C) $\text{0}\text{.01 }\mu A$

D) $\text{0}\text{.25 }\mu A$

• question_answer33) It is possible to observe total internal reflection when a ray travels from

A) air into water

B) air into glass

C) water into glass

D) glass into water

• question_answer34) A combination of convex and concave lenses has power 4D. If the convex lens has power 5D the focal length of the concave lens will be

A) 100 cm

B) $-100cm$

C) $-1\,cm$

D) $-\frac{100}{9}\,cm$

• question_answer35) A liquid of refractive index 1.62 is placed between two plano-convex identical lenses, the medium of which has refractive index 1.54. Two possible arrangement P and Q are shown. The system is

A) divergent in P, convergent in Q

B) convergent in P, divergent ion Q

C) convergent in both

D) divergent in both

• question_answer36) A scooter of mass 120 kg is moving with a uniform velocity of$108\text{ }km{{h}^{-1}}$. The force required to stop the vehicle in 10 s is

A) 360 N

B) 720 N

C) 180 N

D) $120\times 10.8\text{ }N$

• question_answer37) Energy required to accelerate a car from $10\text{ }m{{s}^{-1}}$to$20\text{ }m{{s}^{-1}}$compared with that. required to accelerate from 0 to$10\text{ }m{{s}^{-1}}$is

A) twice

B) three times

C) four times

D) same

• question_answer38) The moment of inertia of the body about on axis is$1.2\text{ }kg\text{ }{{m}^{2}}$. Initially the body is at rest. In order to produce a rotational kinetic energy of 1500 J, an angular acceleration of 25 rads-2 must be applied about the axis for the duration of

A) 2 s

B) 4 s

C) 8s

D) 10s

• question_answer39) A cooking pot should have

A) high specific heat and low conductivity

B) high specific heat and high conductivity

C) low specific heat and low conductivity

D) low specific heat and high conductivity

• question_answer40) A certain force gives a 2 kg object an acceleration of$0.5\text{ }m{{s}^{-2}}$. What acceleration would the same force give to a 10 kg object?

A) $0.1m{{s}^{-2}}$

B) $0.2m{{s}^{-2}}$

C) $0.5m{{s}^{-2}}$

D) $1.0m{{s}^{-2}}$

• question_answer41) A heat engine absorbs heat at$327{}^\circ C$and exhausts heat at$127{}^\circ C$. The efficiency of engine is$\eta$and the maximum amount of work performed by the engine per kilocalorie of heat input is W. Then

A) $\eta =0.38$

B) $\eta =0.88$

C) $W=1596J$

D) $W=1400J$

• question_answer42) A simple pendulum with length L and mass of the bob is vibrating with an amplitude a. Then the maximum tension in the string is

A) $mg$

B) $mg\left[ 1{{\left( \frac{a}{1} \right)}^{2}} \right]$

C) $mg{{\left[ 1+\frac{a}{2L} \right]}^{2}}$

D) $mg{{\left[ 1+\left( \frac{a}{L} \right) \right]}^{2}}$

• question_answer43) A sonometer wire is vibrating in the second overtone. In the wire there are

A) two nodes and two antinodes

B) one node and two antinodes

C) four nodes and three antinodes

D) three nodes and three antinodes

• question_answer44) Two charged conducting spheres of radii${{R}_{1}}$ and${{R}_{2}},$separated by a large distance, are connected by a long wire. The ratio of the charges on, them is

A) $\frac{{{R}_{1}}}{{{R}_{2}}}$

B) $\frac{{{R}_{2}}}{{{R}_{1}}}$

C) $\frac{R_{1}^{2}}{R_{2}^{2}}$

D) $\frac{R_{2}^{2}}{R_{1}^{2}}$

• question_answer45) A proton and an$\alpha -$particle, accelerated through the same potential difference, enter a region of uniform magnetic field normally. If the radius of the proton orbit is 10 cm the radius of$\alpha -$orbit is

A) 10cm

B) $10\sqrt{2}cm$

C) 20cm

D) $5\sqrt{2}cm$

• question_answer46) In a noiseless transformer an alternating current of 2 A is flowing in the primary coil. The number of turns on the primary and secondary coils are 100 and 20 respectively. The value of the current in the secondary coil is

A) 0.08 A

B) 0.4 A

C) 5 A

D) 10 A

• question_answer47) Two photons of energy 2.5 eV each are incident on a metal plate whose work function is 4.0 eV, then the number of electrons emitted from the metal surface will be

A) one

B) two

C) more than two

D) None of these

• question_answer48) The ratio of areas between the electron orbits for the first excited state to the ground state for hydrogen atom is

A) $2:1$

B) $4:1$

C) $8:1$

D) $16:1$

• question_answer49) The voltage gain of an amplifier without feedback is 100. If a negative feedback is introduced with a feedback fraction$p=0.1,$ then the gain of the feedback amplifier is

A) 9.09

B) 10

C) 100.1

D) 90.0

• question_answer50) The sun subtends an angle of half a degree at the pole of a concave mirror which has a radius of curvature of 15 m. Then the size (diameter) of the image of the sun formed by the concave mirror is

A) 7.5 cm

B) 6.55 cm

C) 3.7cm

D) 13.1cm

• question_answer51) Two bodies of equal masses are connected by a light inextensible string passing over a smooth frictionless pulley. The amount of mass that should be transferred from one to another so that both the masses mole 50 m in 5 s is

A) 30 %

B) 40 %

C) 70%

D) 50%

• question_answer52) In the following$p-V$diagram, two Aetobatus cut two isothermal at${{T}_{1}}$and${{T}_{2}}$The value of${{V}_{b}}/{{V}_{c}}$is

A) ${{V}_{a}}/{{V}_{d}}$

B) $<\frac{{{V}_{a}}}{{{V}_{d}}}$

C) $>\frac{{{V}_{a}}}{{{V}_{d}}}$

D) cannot say

• question_answer53) A copper wire of cross-sectional area $=2.0\text{ }m{{m}^{2}},$resistivity$=1.7\times {{10}^{-8}}\Omega m,$carries a current of 1 A. The electric field in the copper wire is

A) $8.5\times {{10}^{-5}}V{{m}^{-1}}$

B) $8.5\times {{10}^{-4}}V{{m}^{-1}}$

C) $8.5\times {{10}^{-3}}V{{m}^{-1}}$

D) $8.5\times {{10}^{-2}}V{{m}^{-1}}$

• question_answer54) A solenoid 30 cm long is made by winding 2000 loops of wire on an iron rod whose cross section is$1.5\text{ }c{{m}^{2}}$. If the relative permeability of the iron is 6000, what is the self-inductance of the solenoid?

A) 1.5 H

B) 2.5 H

C) 3.5 H

D) 0.5 H

• question_answer55) A luminous object is placed 20 cm from surface of a convex mirror and a plane mirror is set, so that virtual mirror is at a distance of 12 cm from object, then focal length of convex mirror is

A) 5 cm

B) 10 cm

C) 20cm

D) 40cm

• question_answer56) The optically active tartaric acid is named as$D-(+)-$tartaric acid because it has a positive

A) optical rotation and derived from D-glucose

B) pH in organic solvent

C) optical rotation and is derived from$D-(+)-$glyceraldehyde

D) optical rotation when substituted by deuterium

• question_answer57) Which one of the following pairs is not correctly matched?

A) Clemmnensen reduction

B) Wolff-Kishner reduction

C) $-COCl\to -CHO$Rosemond reduction

D) $-C\equiv N\to -CHO$Stephen reduction

• question_answer58) Which of the following radical is precipitated as sulphide when treated with hydrogen sulphide in ammonia Cal solution?

A) $B{{a}^{2+}}$

B) $N{{i}^{2+}}$

C) $M{{g}^{2+}}$

D) $C{{a}^{2+}}$

• question_answer59) Isomerism which arises due to the presence of two different atoms in the same ligand is called

B) hydrate

C) salt

D) Both (a) and (b)

• question_answer60) The black compound formed during the reaction between sodium thiosulphate and silver nitrate is

A) silver thiosulphate

B) silver sulphide

C) silver sulphate

D) silver sulphite

• question_answer61) Electrode potential data are given below $F{{e}^{3+}}(aq)++{{e}^{-}}F{{e}^{2+}}(aq)$ $E{}^\circ =+0.77V$ $A{{l}^{3+}}(aq)+3{{e}^{-}}\xrightarrow[{}]{{}}Al(s)$ $E{}^\circ =-1.66\,V$ $B{{r}_{2}}(aq)+2{{e}^{-}}\xrightarrow[{}]{{}}2B{{r}^{-}}(aq)$ $E{}^\circ =+1.08\,V$ Based on the data given above, reducing power of$F{{e}^{2+}},Al$and$B{{r}^{-}},$will increase, in the order

A) $B{{r}^{-}}<F{{e}^{2+}}<Al$

B) $F{{e}^{2+}}<Al<B{{r}^{-}}$

C) $Al<B{{r}^{-}}<F{{e}^{2+}}$

D) $Al<F{{e}^{2+}}<B{{r}^{-}}$

• question_answer62) Which of the following volume (V)$-$temperature (T) plots represent the behaviour of one mole of an ideal gas at one atmospheric pressure?

A)

B)

C)

D)

• question_answer63) Amongst the following, identify the species with an atom in$+6$oxidation state

A) $MnO_{4}^{-}$

B) $Cr(CN)_{6}^{3-}$

C) $NiF_{6}^{2-}$

D) $Cr{{O}_{2}}C{{l}_{2}}$

• question_answer64) What is the concentration of nitrate ions if equal-volumes of$0.1M\,AgN{{O}_{3}}$and$0.1\text{ }M\text{ }NaCl$are mixed together?

A) 0.1 N

B) 0.2 M

C) 0.05 M

D) 0.25 M

• question_answer65) Consider the following statements (I) A sigma$(\sigma )$ bond is formed when two$s-$ orbitals overlap (II) A pi$(\pi )$bond is formed when two$p-$ orbitals axially overlap (III) A$\sigma$ bond is weaker than$\pi -$bond Which of the above statements is/are correct?

A) II and III

B) I and II

C) I alone

D) II alone

• question_answer66) Speed of decomposition of${{H}_{2}}{{O}_{2}}$is reduced by

A) $N{{a}_{2}}C{{O}_{3}}$

B) $NaOH$

C) alcohol

D) $Pt$

A) $N<Be<B$

B) ${{F}^{-1}}<{{O}^{2-}}<{{N}^{3-}}$

C) $Na<Li<K$

D) $F{{e}^{3+}}<F{{e}^{2+}}<F{{e}^{4+}}$

• question_answer68) Amalgamation method is used for the extraction of

A) noble metals

B) alkali metals

C) alkaline earth metals

D) transition elements

• question_answer69) The alkali metal that reacts with nitrogen directly to form nitride is

A) $Li$

B) $Na$

C) K

D) $Rb$

A) a solution of magnesium

B) a solution of magnesium carbonate

C) a solution of magnesium bicarbonate

D) a solution of magnesium sulphate

• question_answer71) A compound with the molecular formula ${{C}_{3}}{{H}_{8}}O$on vigorous oxidation produces an acid ${{C}_{3}}{{H}_{6}}{{O}_{2}}$. It is

A) a tertiary alcohol

B) a secondary alcohol

C) a primary alcohol

D) not necessarily an alcohol

• question_answer72) The correct order of basic ties of the following compounds is (1) (2) $C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}}$ (3) ${{(C{{H}_{3}})}_{2}}NH$ (4) $C{{H}_{3}}-\overset{\begin{smallmatrix} O \\ |\,\,| \end{smallmatrix}}{\mathop{C}}\,-N{{H}_{2}}$

A) $2>1>3>4$

B) $1>3>2>4$

C) $3>1>2>4$

D) $1>2>3>4$

• question_answer73) $R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-OH\xleftarrow[{}]{{{H}_{3}}{{O}^{+}}}X\xrightarrow[{}]{[H]}RC{{H}_{2}}N{{H}_{2}}$ Here X is

A) isonitrile

B) nitrile

C) nitrite

D) oxime

• question_answer74) Identify$X$${{C}_{6}}{{H}_{6}}\xrightarrow[reflux]{HN{{O}_{3}}/{{H}_{2}}S{{O}_{4}}}$Intermediate$\xrightarrow[heat]{Sn/HCl}X$

A)

B)

C)

D)

• question_answer75) Rutherfords a-particle dispersion experiment concludes

A) all positive ions are deposited at small part

B) all negative ions are deposited at small part

C) proton moves around the electron

D) neutrons are charged particles

• question_answer76) Identify the correct statement when following compounds are given$HF,HBr,{{H}_{2}}Se,{{H}_{2}}Te,{{H}_{3}}P$

A) HF is strong acid

B) ${{H}_{2}}Te$is strong alkali

C) $HBr$is strong acid

D) ${{H}_{3}}P$is strong alkali

• question_answer77) Calcium is obtained by

A) electrolysis of molten $CaC{{l}_{2}}$

B) electrolysis of aq solution of $CaC{{l}_{2}}$

C) reduction of$CaC{{l}_{2}}$with carbon

D) roasting of lime stone

• question_answer78) Heat of dissociation of benzene to elements in$5535\text{ }kJ\text{ }mo{{l}^{-1}}$. The bond enthalpies of$C-C,$ $C=C,$and$C-H$are 347.3, 615.0 and 416.2 kJ respectively resonance energy of benzene is

A) 1.51 kJ

B) 15.1 kJ

C) 151 kJ

D) 1511 kJ

• question_answer79) The rate constant for the reaction,$2{{N}_{2}}{{O}_{5}}\xrightarrow[{}]{{}}4N{{O}_{2}}+{{O}_{2}}$$3.0\times {{10}^{-5}}{{s}^{-1}}$. If the rate is$2.40\times {{10}^{-5}}$mol ${{L}^{-1}}{{s}^{-1}},$Then the concentration of${{N}_{2}}{{O}_{5}}$(in mol ${{L}^{-1}}$) is

A) 1.4

B) 1.2

C) 0.04

D) 0.8

• question_answer80) Which one of the following has highest pH?

A) Distilled water

B) $1M\,N{{H}_{3}}$

C) $1M\,NaOH$

D) Water saturated with chlorine

• question_answer81) Which of the following element of$IIIA$group form alum with aluminum like alkali metals?

A) $B$

B) $Ca$

C) $In$

D) $Te$

• question_answer82) Which of the following is used as a test for detecting the presence of carbon monoxide?

A) Reduction of metallic oxides to metals

B) Reduction of water to hydrogen

C) Reduction of$PdC{{l}_{2}}$to$Pd$(Black)

D) All of the above

• question_answer83) Nitrogen can exists in two forms which are correct about them? (i) $\alpha -$nitrogen with cubic crystalline structure (ii)$\beta -$nitrogen with cubic crystalline structure (iii)$\beta -$nitrogen with hexagonal crystalline structure

A) Both (i) and (iii)

B) Both (i) and (ii)

C) Both (ii) and (iii)

D) None of these

• question_answer84) Which of the following mixture Is called black ash?

A) ${{K}_{2}}C{{O}_{3}}+CuS$

B) $N{{a}_{2}}C{{O}_{3}}+CaS$

C) ${{K}_{2}}C{{O}_{3}}+N{{a}_{2}}S$

D) $N{{a}_{2}}C{{O}_{3}}+N{{a}_{2}}S$

A) 4 oxygen atom

B) 2 oxygen atom

C) 3 oxygen atom

D) 10 oxygen atom

• question_answer86) When glucose is warmed with dilute alkali solution converted into a mixture of

A) glucose and manose

B) glucose and fructose

C) manose and fructose

D) glucose and manose and fructose

• question_answer87) Methyl amine reacts with nitrous acid to form

A) methyl nitrile

B) dimethyle ether

C) Both (a) and (b)

D) None of these

A) ${{C}_{6}}{{H}_{5}}OH>{{C}_{6}}{{H}_{5}}COOH>C{{H}_{3}}COOH$

B) ${{C}_{6}}{{H}_{5}}COOH>C{{H}_{3}}COOH>{{C}_{6}}{{H}_{5}}OH$

C) $C{{H}_{3}}COOH>{{C}_{6}}{{H}_{5}}COOH>{{C}_{6}}{{H}_{5}}OH$

D) ${{C}_{6}}{{H}_{5}}OH>C{{H}_{3}}COOH>{{C}_{6}}{{H}_{5}}COOH$

• question_answer89) Which of the following is most reactive towards nucleophilic addition reaction?

A) $HCHO$

B) $C{{H}_{3}}CHO$

C) ${{C}_{2}}{{H}_{5}}CHO$

D) $C{{H}_{3}}.CO.C{{H}_{3}}$

• question_answer90) Meta formaldehyde is a

A) polymer

B) tetramer

C) trimer

D) dimer

• question_answer91) An aqueous solution of urea freezes at 272.8 K. An equimolar solution of acetic acid in water will freeze at

A) 272.8 K

B) 272.79 K

C) 272.81 K

D) 272.6 K

• question_answer92) A mixture of 0.3 mol of H2 and 0. 3 mole of 12 is allowed to react in a 10 L evacuated flask at$500{}^\circ C$. The reaction is${{H}_{2}}+{{I}_{2}}2HI$.The K is found to be 64. The amount of unreacted 12 at equilibrium is

A) 0.15 mol

B) 0.06 mol

C) 0.03 mol

D) 0.2 mol

• question_answer93) $IF{{N}_{2}}+3{{H}_{2}}2N{{K}_{3}}-K$and $2{{N}_{2}}+6{{H}_{2}}4N{{H}_{3}}-{{k}^{-1}}$ then${{k}^{-1}}$ will be

A) ${{k}^{2}}$

B) $\sqrt{k}$

C) $\frac{1}{\sqrt{k}}$

D) $\frac{1}{{{k}^{2}}}$

• question_answer94) With the rise in temperature, the surface tension of a liquid

A) increases

B) decreases

C) remain constant

D) first increase then decrease

• question_answer95) At STP a container has 1 mole of Ar, 2 mol of $C{{O}_{2}},$3 mol of${{O}_{2}}$and 4 mol of${{N}_{2}}$without changing the total pressure if one mole of${{O}_{2}}$is removed, the partical pressure of${{O}_{2}}$

A) is change by about 16%

B) is halved

C) is changed by 26%

D) is unchanged

• question_answer96) Due to Frenkel defect, the density of ionic solid

A) decreases

B) increases

C) does not change

D) charge

A) trivalent impurity

B) tetravalent impurity

C) pentavaient impurity

D) divalent impurity

• question_answer98) 0.45 g of acid of molecular weight 90 was neutralised by 20 mL of 0.5 N Caustic potash. The basicity of the acid is

A) 1

B) 2

C) 3

D) 4

• question_answer99) Which of the following cannot give iodometric titrations?

A) $F{{e}^{3+}}$

B) $C{{u}^{2+}}$

C) $P{{b}^{2+}}$

D) $A{{g}^{+}}$

• question_answer100) Oxidation state of Fe in$F{{e}_{3}}{{O}_{4}}$is

A) 2/3

B) 4/5

C) 5/4

D) 8/3

• question_answer101) A compound contains atoms of three elements AB and C. If the oxidation number of A is$+2,$B is$+5,$and that of C is$-2,$the possible formula of the compound is

A) ${{A}_{3}}{{(B{{C}_{4}})}_{2}}$

B) ${{A}_{3}}{{({{B}_{4}}C)}_{2}}$

C) $AB{{C}_{2}}$

D) ${{A}_{2}}{{(B{{C}_{3}})}_{2}}$

• question_answer102) For the redox reaction,$MnO_{4}^{-}+{{C}_{2}}O_{4}^{2-}+{{H}^{+}}\xrightarrow[{}]{{}}M{{n}^{2+}}+C{{O}_{2}}+{{H}_{2}}O$the correct coefficient of the reactants for the balanced reaction are $MnO_{4}^{-}$ ${{C}_{2}}O_{4}^{2-}$ ${{H}^{+}}$

A) 2 5 16

B) 16 5 2

C) 5 16 2

D) 2 16 5

• question_answer103) An example of Lewis acid is

A) $NaCl$

B) $MgC{{l}_{2}}$

C) $CC{{l}_{4}}$

D) $AlC{{l}_{3}}$

• question_answer104) The conjugate acid of$NH_{2}^{-}$is

A) $N{{H}_{3}}$

B) $N{{H}_{2}}OH$

C) $NH_{4}^{+}$

D) ${{N}_{2}}{{H}_{4}}$

• question_answer105) Which of the following is hot paramagnetic?

A) $NO$

B) ${{N}_{2}}$

C) $CO$

D) ${{O}_{2}}$

• question_answer106) The values of electronegativitys of atom A and B are 1.20 and 4.0 respectively. The percentage of ionic character of$A-B$bond is

A) 50%

B) 72.24%

C) 55.3%

D) 43%

• question_answer107) A sample of wood decayed to 1/16 of its, original value. What is the number of${{t}_{1/2}}$?

A) 3

B) 4

C) 8

D) 16

A) binary fission

B) nuclear fission

C) stable nuclei

D) decay of unstable nuclei

• question_answer109) The kinetic energy of an electron accelerated from rest through a potential difference of 5V will be

A) 5eV

B) 5J

C) 5 erg

D) 80 eV

• question_answer110) A 2.5 mol sample of hydrazine,${{N}_{2}}{{H}_{4}}$loses 25 mole of electrons in being converted to a new compound$X$. Assuming that all of the nitrogen appears in the new compound, what is the oxidation state of nitrogen in compound$X$?

A) $-1$

B) $-2$

C) $+3$

D) $+4$

• question_answer111) If the expression$\frac{\left[ \sin \left( \frac{x}{2} \right)+\cos \left( \frac{x}{2} \right)-i\tan (x) \right]}{\left[ 1+2i\sin \left( \frac{x}{2} \right) \right]}$is real the set of all possible value of$x$is

A) $n\pi +\alpha$

B) $2n\pi$

C) $\frac{n\pi }{2}+\alpha$

D) None of these

• question_answer112) If${{t}_{1}},{{t}_{2}}$and${{t}_{3}}$are distinct, points$({{t}_{1}},2a{{t}_{3}}+at_{1}^{3}),$$({{t}_{2}},2a{{t}_{2}}+at_{2}^{3})$and$({{t}_{3}},2a{{t}_{3}}+at_{3}^{3})$are collinear, if

A) ${{t}_{1}}{{t}_{2}}{{t}_{3}}=1$

B) ${{t}_{1}}+{{t}_{2}}+{{t}_{3}}={{t}_{1}}{{t}_{2}}{{t}_{3}}$

C) ${{t}_{1}}+{{t}_{2}}+{{t}_{3}}=0$

D) ${{t}_{1}}+{{t}_{2}}+{{t}_{3}}=-1$

• question_answer113) If the pair of straight lines$a{{x}^{2}}+2hxy-a{{y}^{2}}=0$ and $b{{x}^{2}}+2gxy-b{{y}^{2}}=0,$be such that each bisect the angle between the other, then

A) $hg+ab=0$

B) $ah+bg=0.$

C) ${{h}^{2}}-ab=0$

D) $ag+bh=0.$

• question_answer114) The locus of a points which moves such that the sum of the squares of its distance from three vertices of the triangle is constant is a/an

A) circle

B) straight line

C) ellipse

D) None of these

• question_answer115) AB is a chord of the parabola${{y}^{2}}=4ax$with vertex at A. BC is drawn perpendicular to AB meeting the axis at C. The projection of BC on the axis of the parabola is

A) 2

B) $2a$

C) $4a$

D) $8a$

• question_answer116) If$\tan {{\theta }_{1}},\tan {{\theta }_{2}}=-\frac{{{a}^{2}}}{{{b}^{2}}},$ then the chord joining two points${{\theta }_{1}}$and${{\theta }_{2}}$on the ellipse $\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1$ will subtend a right angle at

A) focus

B) centre

C) end of the major axis

D) end of the minor axis

• question_answer117) The largest interval for which${{x}^{2}}-{{x}^{9}}+{{x}^{4}}-x+1>0$is

A) $-4<x<0$

B) $0<x<1$

C) $-100<x<100$

D) $-\infty <x<\infty$

• question_answer118) The eccentricity of the conic represented by ${{x}^{2}}-{{y}^{2}}-4x+4y+16=0$is

A) 1

B) $\sqrt{2}$

C) 2

D) $1/2$

• question_answer119) Let$f$be a twice differentiable function such that$f(x)=-f(x)$and$f(x)=g(x)$. If$h(x)=[f{{(x)}^{2}}+g{{(x)}^{2}}]h(1)=8$and$h(0)=2,$then$h(2)$is equal to

A) 1

B) 2

C) 3

D) None of these

• question_answer120) The equation of$f$those tangents to $4{{x}^{2}}-9{{y}^{2}}=36$which are perpendicular to the straight line$5x+2y-10=0$are

A) $5(y-3)=2\left( x-\frac{\sqrt{117}}{2} \right)$

B) $2x-5y+10-2\sqrt{18}=0$

C) $2x-5y-10-2\sqrt{18}=0$

D) None of the above

• question_answer121) If$f(x)=a\log |x|+b{{x}^{2}}+x$has its extremum value at$x=-1$and$x=2,$then

A) $a=2,b=-1$

B) $a=2,b=\frac{-1}{2}$

C) $a=-2,b=\frac{1}{2}$

D) None of these

• question_answer122) If$\int{\frac{1}{(\sin x+4)(\sin x-1)}}dx$$=A=\frac{1}{\tan \frac{x}{2}-1}+B{{\tan }^{-1}}(f(x))+{{C}_{1}}$. Then

A) $A=\frac{1}{5},B=\frac{-2}{5\sqrt{15}},f(x)=\frac{4\tan x+3}{\sqrt{15}}$

B) $A=-\frac{1}{5},B=\frac{1}{\sqrt{15}},f(x)=\frac{4\tan x\left( \frac{x}{2} \right)+1}{\sqrt{15}}$

C) $A=\frac{2}{5},B=\frac{-2}{5},f(x)=\frac{4\tan x+1}{5}$

D) $A=\frac{2}{5},B=\frac{-2}{5\sqrt{15}},f(x)=\frac{4\tan \frac{x}{2}+1}{\sqrt{15}}$

• question_answer123) If${{a}_{1}},{{a}_{2}},.....,{{a}_{n}}$On are in arithmetic progression, where${{a}_{i}}>0$for all$i$. Then $\frac{1}{\sqrt{{{a}_{1}}}+\sqrt{{{a}_{2}}}}+\frac{1}{\sqrt{{{a}_{2}}}+\sqrt{{{a}_{3}}}}+...+\frac{1}{\sqrt{{{a}_{n-1}}}+\sqrt{{{a}_{n}}}}$is equal to

A) $\frac{{{n}^{2}}(n+1)}{2}$

B) $\frac{n-1}{\sqrt{{{a}_{1}}}+\sqrt{{{a}_{n}}}}$

C) $\frac{n(n-1)}{2}$

D) None of these

• question_answer124) Let$f$be a positive function. Let${{I}_{1}}=\int_{1-k}^{k}{xf\{x(1-x)\}}dx,$${{I}_{2}}=\int_{1-k}^{k}{f\{x(1-x)\}}dx$where$2k-1>0$. Then, $\frac{{{I}_{1}}}{{{I}_{2}}}$is

A) 2

B) $k$

C) $\frac{1}{2}$

D) 1

• question_answer125) The area bounded by the curve$y=x|x|,$$x-$axis and the ordinates$x=1,\text{ }x=-1$is given by

A) 6

B) $\frac{1}{3}$

C) $\frac{2}{3}$

D) None of these

• question_answer126) The degree of the differential equation satisfying$\sqrt{1-{{x}^{2}}}+\sqrt{1-{{y}^{2}}}=a(x-y)$is

A) 1

B) 2

C) 3

D) None of these

• question_answer127) 7 relatives of a man comprises 4 ladies and 3 gentlemen his wife has also 7 relatives, 3 of them are ladies and 4 gentlemen. In how many ways can they invite a dinner party of 3 ladies and 3 gentlemen so that there are 3 of mans relative and 3 of the wifes relative?

A) 485

B) 500

C) 486

D) 102

• question_answer128) If$\overrightarrow{\alpha }=x(\overrightarrow{a}\times \overrightarrow{b})+y(\overrightarrow{b}\times \overrightarrow{c})+z(\overrightarrow{c}\times \overrightarrow{a})$and$[\overrightarrow{a}\overrightarrow{b}\overrightarrow{c}]=\frac{1}{8},$then$x+y+z$is equal to

A) $8\overrightarrow{\alpha }.(\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c})$

B) $\overrightarrow{\alpha }.(\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c})$

C) $8(\overrightarrow{a}+\overrightarrow{b}+\overrightarrow{c})$

D) None of these

• question_answer129) The$xy-$plane divides the line joining the points$(-1,3,4)$and$(2,-5,6)$

A) internally in the ratio $2:3$

B) externally in the ratio$2:3$

C) internally in the ratio$3:2$

D) externally in the ratio$3:2$

• question_answer130) The plane$2x-(1+\lambda )y+3\lambda z=0$passes through the intersection of the plane

A) $2x-y=0$and $y+3z=0$

B) $2x-y=0$and $y-3z=0$

C) $2x+3z=0$and $y=0$

D) None of the above

• question_answer131) In a triangle ABC,$sin\text{ }A-cos\,B=cosC,$then angle B is

A) $\frac{\pi }{2}$

B) $\frac{\pi }{3}$

C) $\frac{\pi }{4}$

D) $\frac{\pi }{6}$

• question_answer132) Eight chair are numbered 1 to 8. Two women and three men wish to occupy one chair each. First the women choose the chairs from amongst the chair marked 1 to 4; and then the men select the chairs from amongst the remaining. The number of possible arrangements is

A) $^{6}{{C}_{3}}{{\times }^{4}}{{C}_{2}}$

B) $^{4}{{P}_{2}}{{\times }^{6}}{{P}_{3}}$

C) $^{4}{{C}_{2}}{{\times }^{4}}{{P}_{3}}$

D) None of these

• question_answer133) In a $\Delta ABC,\tan \frac{A}{2}=\frac{5}{6},\tan \frac{C}{2}=\frac{2}{5},$then

A) a, c, b are in AP

B) a, b, c are in AP

C) b, a, c are in AP

D) a, b, c are in GP

• question_answer134) $\Sigma {{a}^{3}}\cos (B-C)$is equal to

A) $3abc$

B) $3(cz+b+c)$

C) $abc(a+b+c)$

D) 0

• question_answer135) If$\alpha ,\beta ,\gamma \in \left[ 0,\frac{\pi }{2} \right],$ then the value of $\frac{\sin (\alpha +\beta +\gamma )}{sin\text{ }\alpha +sin\,\beta +sin\text{ }\gamma }$is

A) $<1$

B) $=-1$

C) $<0$

D) None of these

• question_answer136) If $f(x)=$$\left| \begin{matrix} 1 & x & x+1 \\ 2x & x(x-1) & (x+1)x \\ 3x(x-1) & x(x-1)(x-2) & (x+1)x(x-1) \\ \end{matrix} \right|$then$f(100)$is equal to

A) 0

B) 1

C) 100

D) $-100$

• question_answer137) The general value of 6 satisfying the equation $2si{{n}^{2}}\theta -3sin\theta -2=0$is

A) $n\pi +{{(-1)}^{n+1}}\frac{\pi }{6}$

B) $n\pi +{{(-1)}^{n}}\frac{\pi }{2}$

C) $n\pi +{{(-1)}^{n}}\frac{5\pi }{6}$

D) $n\pi +{{(-1)}^{n}}\frac{7\pi }{6}$

• question_answer138) In a right angled triangle the hypotenuse is$2\sqrt{2}$times the length of perpendicular drawn from the opposite vertex on the hypotenuse, then the other two angles are

A) $\frac{\pi }{3},\frac{\pi }{6}$

B) $\frac{\pi }{4},\frac{\pi }{4}$

C) $\frac{\pi }{8},\frac{3\pi }{8}$

D) $\frac{\pi }{12},\frac{5\pi }{12}$

• question_answer139) lf $x+y+z=xyz,$then $ta{{n}^{-1}}x+ta{{n}^{-1}}y+ta{{n}^{-1}}z$ is equal to

A) $\pi$

B) $\frac{\pi }{2}$

C) 1

D) None of these

• question_answer140) If two events A and B are such$P({{A}^{c}})=0.3$ $P(B)=0.4$and$P(A\cap {{B}^{c}})=0.5,$then $P[B/{{(A\cup B)}^{c}}]$is equal to

A) 1/2

B) 1/4

C) 0

D) None of these

• question_answer141) If${{x}_{1}},{{x}_{2}},{{x}_{3}},{{x}_{4}}$are roots of the equation${{x}^{4}}-{{x}^{3}}$ $\sin 2\beta +{{x}^{2}}\cos 2\beta -x\cos \beta -\sin \beta =0,$ then ${{\tan }^{-1}}{{x}_{1}}+{{\tan }^{-1}}{{x}_{2}}+{{\tan }^{-1}}{{x}_{3}}+{{\tan }^{-1}}{{x}_{4}}$is equal to

A) $\beta$

B) $\frac{\pi }{2}-\beta$

C) $\pi -\beta$

D) $-\beta$

• question_answer142) The value of$\cos (2{{\cos }^{-1}}0.8)$is

A) 0.48

B) 0.96

C) 0.6

D) None of these

• question_answer143) ABC is a triangular park with$AB=AC=100\text{ }m$A clock tower is situated at the mid point of BC. The angle of elevation if the top of the tower at A and B are$co{{t}^{-1}}3.2$and$\cos e{{c}^{-1}}2.6$ respectively. The height of the tower is

A) 16 m

B) 25 m

C) 50 m

D) None of these

• question_answer144) The equation$\frac{3}{4}{{({{\log }_{2}}x)}^{2}}+{{\log }_{2}}x-\frac{5}{4}={{\log }_{x}}\sqrt{2}$has

A) at least one real solutions

B) exactly three real solutions

C) exactly one irrational solution

D) complex roots

• question_answer145) If G is the GM of the product of r set of observation with geometric means${{G}_{1}},{{G}_{2}},....{{G}_{r}}$respectively, then G is equal to

A) $\log {{G}_{1}}+\log {{G}_{2}}+....+\log {{G}_{n}}$

B) ${{G}_{1}}{{G}_{2}}....{{G}_{n}}$

C) $\log {{G}_{1}},\log {{G}_{2}},....,\log {{G}_{n}}$

D) None of the above

• question_answer146) If$Z=aX+bY$and r the correlation coefficient between$X$and$Y$,then$\sigma _{z}^{2}$is equal to

A) ${{a}^{2}}\sigma _{X}^{2}+{{b}^{2}}\sigma _{Y}^{2}+2abr\,{{\sigma }_{X}}{{\sigma }_{Y}}$

B) ${{a}^{2}}\sigma _{X}^{2}+{{b}^{2}}\sigma _{Y}^{2}-2abr\,{{\sigma }_{X}}{{\sigma }_{Y}}$

C) $2abr\,{{\sigma }_{X}}{{\sigma }_{Y}}$

D) None of the above

• question_answer147) If${{\log }_{2}}({{5.2}^{x}}+1),{{\log }_{4}}({{2}^{1-x}}+1)$and 1 are in AP, then$x$equals

A) $lo{{g}_{2}}5$

B) $1-lo{{g}_{2}}5$

C) $lo{{g}_{5}}2$

D) None of these

• question_answer148) If$A=\left[ \begin{matrix} \alpha & 0 \\ 1 & 1 \\ \end{matrix} \right]$and$B=\left[ \begin{matrix} 1 & 0 \\ 5 & 1 \\ \end{matrix} \right],$then value of a for which${{A}^{2}}=B$is

A) 1

B) $-1$

C) 4

D) no real value

• question_answer149) The maximum value of$|z|$when z satisfies the condition$\left| 2+\frac{2}{z} \right|=2$is

A) $\sqrt{3}-1$

B) $\sqrt{3}$

C) $\sqrt{3}+1$

D) $\sqrt{2}+\sqrt{3}$

• question_answer150) The value$1+\sum\limits_{k=0}^{14}{\left\{ \cos \frac{(2k+1)\pi }{15}+i\sin \frac{(2k+1)\pi }{15} \right\}}$is

A) 0

B) $-1$

C) 1

D) $i$

• question_answer151) The sum to n terms of the infinite series ${{1.3}^{2}}+{{2.5}^{2}}+{{3.7}^{2}}+...\infty$is

A) $\frac{n}{6}(n+1)(6{{n}^{2}}+14n+7)$

B) $\frac{n}{6}(n+1)(2n+1)(3n+1)$

C) $4{{n}^{3}}+4{{n}^{2}}+n$

D) None of the above

• question_answer152) If$f(x)={{\sin }^{2}}x+{{\sin }^{2}}\left( x+\frac{\pi }{3} \right)$$+\cos x\cos \left( x+\frac{\pi }{3} \right)$ and$g\left( \frac{5}{4} \right)=1,$then$gof(x)$is equal to

A) 0

B) 2

C) 1

D) 3

• question_answer153) If the roots of the quadratic equation${{x}^{2}}-4x-lo{{g}_{3}}a=0$are real, then the least value of a is

A) 81

B) 1/81

C) 1/64

D) None of these

• question_answer154) The exponent of 12 in 100 is

A) 48

B) 49

C) 96

D) None of these

• question_answer155) The value of$1.1!+2.2!+3.3!+...+n.n!$is

A) $(n+1)!$

B) $(n+1)!+1$

C) $(n+1)!-1$

D) None of these

• question_answer156) $\underset{n\to \infty }{\mathop{\lim }}\,\frac{1}{n}\sum\limits_{r=1}^{2n}{\frac{r}{\sqrt{{{n}^{2}}+{{r}^{2}}}}}$equals

A) $1+\sqrt{5}$

B) $-1+\sqrt{5}$

C) $-1+\sqrt{2}$

D) $1+\sqrt{2}$

• question_answer157) If${{(1+2x+3{{x}^{2}})}^{10}}={{a}_{0}}+{{a}_{1}}x+{{a}_{2}}{{x}^{2}}$$+...+{{a}_{20}}{{x}^{20}},$then${{a}_{1}}$equals

A) 10

B) 20

C) 210

D) None of these

• question_answer158) The sum of series$\sum\limits_{n-1}^{\infty }{\frac{2n}{(2n+1)!}}$is

A) $e$

B) $-1$

C) $2e$

D) None of these

• question_answer159) If the value of the determinants$\left| \begin{matrix} a & 1 & 1 \\ 1 & b & 1 \\ 1 & 1 & c \\ \end{matrix} \right|$is positive, then

A) $abc>1$

B) $abc>-8$

C) $abc<-8$

D) $abc>-2$

• question_answer160) The function$f(x)=\frac{ln(1+ax)-ln(1-bx)}{x}$is not defined at$x=0$. The value which should be assigned to$f$at$x=0$so that it is continuous at$x=0,$is

A) $a-b$

B) $a+b$

C) $ln\text{ }a+ln\text{ }b$

D) None of these

• question_answer161) If$f(x+2y,x,x-2y)=xy,$then$f(x,y)$equals

A) $\frac{{{x}^{2}}-{{y}^{2}}}{8}$

B) $\frac{{{x}^{2}}-{{y}^{2}}}{4}$

C) $\frac{{{x}^{2}}+{{y}^{2}}}{4}$

D) $\frac{{{x}^{2}}-{{y}^{2}}}{2}$

• question_answer162) If$\underset{x\to \infty }{\mathop{\lim }}\,\left[ \frac{{{x}^{3}}+1}{{{x}^{2}}+1}-(ax+b) \right]=2,$then

A) $a=1,\text{ }b=-2$

B) $a=-1,\text{ }b=2$

C) $a=-1,\text{ }b=-2$

D) None of these

• question_answer163) $\underset{x\to \infty }{\mathop{\lim }}\,\frac{\sqrt{{{x}^{2}}+1}-\sqrt[3]{{{x}^{3}}+1}}{\sqrt{{{x}^{4}}+1}-\sqrt[3]{{{x}^{4}}+1}}$equals

A) 1

B) 0

C) $-1$

D) None of these

• question_answer164) The tangent at (1,7) to the curve${{x}^{2}}=y-6$touches the circle${{x}^{2}}+{{y}^{2}}+16x+12y+c=0$at

A) (6, 7)

B) $(-6,7)$

C) $(6,-7)$

D) $(-6,-7)$

• question_answer165) The set of points where the function$f(x)=x|x|$is differentiable is

A) $(-\infty ,\infty )$

B) $(-\infty ,0)\cup (0,\infty )$

C) $(0,\infty )$

D) $[0,\infty )$

• question_answer166) If$f(x)=|{{\log }_{e}}|x||,$then${{f}_{0}}(x)$equals

A) $\frac{1}{|x|},x\ne 0$

B) $\frac{1}{x}$for $|x|>1$and$\frac{-1}{x}$for $|x|<1$

C) $\frac{-1}{x}$for $|x|>1$and $\frac{1}{x}$for $|x|<1$

D) $\frac{1}{x}$for$x>0$and$-\frac{1}{x}$for $x<0$

• question_answer167) The equation of the tangent to the curve $y=(2x-1){{e}^{2(1-x)}}$at the points its maximum, is

A) $y-1=0$

B) $x-1=0$

C) $x+y-1=0$

D) $x-y+1=0$

• question_answer168) A function$f(x)=\left\{ \begin{matrix} 1+x,\,\,x\le 2 \\ 5-x,\,\,x>2 \\ \end{matrix} \right.$is

A) not continuous at $x=2$

B) differentiable at$x=2$

C) continuous but not differentiable at$x=2$

D) None of the above

• question_answer169) The interval of increase of the function$f(x)=x-{{e}^{x}}+\tan (2\pi /7)$is

A) $(0,\infty )$

B) $(-\infty ,0)$

C) $(1,\infty )$

D) $(-\infty ,-1)$

• question_answer170) Let$P(x)={{a}_{0}}+{{a}_{1}}{{x}^{2}}+{{a}_{2}}{{x}^{4}}+...+{{a}_{n}}{{x}^{2n}}$be a polynomial in a real variable$x$with $0<{{a}_{0}}<{{a}_{1}}<{{a}_{2}}<...<{{a}_{n}}$.The function$P(x)$has

A) neither a maximum nor a minimum

B) only one maximum

C) only one minimum

D) only one maximum and only one minimum