# Solved papers for JCECE Engineering JCECE Engineering Solved Paper-2011

### done JCECE Engineering Solved Paper-2011

• question_answer1) The dimension of $\frac{p}{a}$ in the equation$p=\frac{b-{{t}^{2}}}{ax}$ where $p$ is pressure, $x$ is distance and $t$ is time are

A) $[ML{{T}^{-2}}]$

B) $[M{{T}^{-2}}]$

C) $[M{{L}^{3}}{{T}^{-2}}]$

D) $[L{{T}^{-3}}]$

• question_answer2) A body moving with uniform acceleration describes $12\,\,m$ in the third second of its motion and $20\,\,m$ in the $5th$ second. Find the velocity after $10th$ second.

A) $40\,\,m/s$

B) $42\,\,m/s$

C) $52\,\,m/s$

D) $4\,\,m/s$

• question_answer3) A ball rolls of the top of a stair way with a horizontal velocity$u\,\,m{{s}^{-1}}$. If the steps are $h$ metre high and $b$ metre wide, the ball will hit the edge of the nth step, where $n$ is

A) $\frac{2hu}{g{{b}^{2}}}$

B) $\frac{2h{{u}^{2}}}{g{{b}^{2}}}$

C) $\frac{2h{{u}^{2}}}{gb}$

D) $\frac{h{{u}^{2}}}{g{{b}^{2}}}$

• question_answer4) A man slides down a light rope whose breaking strength is $\eta$ times his weight. What should be his maximum acceleration so that the rope just not breaks?

A) $g(1-\eta )$

B) $\eta g$

C) $\frac{g}{1+\eta }$

D) $\frac{g}{1-\eta }$

• question_answer5) The motor of an engine is rotating about its axis with an angular velocity of$100\,\,rev/m$. It comes to rest in$15\,\,s$, after being switched off. Assuming constant angular deceleration. What are the numbers of revolutions made by it before coming to rest?

A) $12.5$

B) $40$

C) $32.6$

D) $15.6$

• question_answer6) By what percent the energy of a satellite has to be increased to shift it from an orbit of radius$r$to$3r$?

A) $22.3%$

B) $33.3%$

C) $66.7%$

D) $100%$

• question_answer7) To maintain a rotar at uniform angular speed of$200\,\,rad/s$, an engine needs to transmit a torque of$180\,\,Nm$. What is the power required by engine? (Assume efficiency of engine to be $80%)$

A) $36\,\,kW$

B) $18\,\,kW$

C) $45\,\,kW$

D) $54\,\,kW$

• question_answer8) Two pendulum have time period $T$ and $\frac{5T}{4}$ they start $SHM$ at the same time form the mean position. What will be the phase difference between them after the bigger pendulum completed one oscillation

A) ${{45}^{o}}$

B) ${{90}^{o}}$

C) ${{60}^{o}}$

D) ${{30}^{o}}$

• question_answer9) An open pipe of length $33\,\,cm$ resonates with frequency of$1000\,\,Hz$. If the speed of sound is $333\,\,m{{s}^{-1}}$, then this frequency is

A) fundamental frequency of the pipe

B) third harmonic of the pipe

C) second harmonic of the pipe

D) fourth harmonic of the pipe

• question_answer10) Water rises to a height h in a capillary at the surface of earth on the surface of the moon the height of water column in the same capillary will be

A) $6h$

B) $h/6$

C) $h$

D) $zero$

• question_answer11) The molar heat capacity in a process of a diatomic gas, if it does a work of $Q/4$ when heat $Q$ is supplied to it, is

A) $\frac{2}{5}R$

B) $\frac{10}{3}R$

C) $\frac{5}{3}R$

D) $\frac{6}{5}R$

• question_answer12) A black body has maximum energy at wavelength ${{\lambda }_{m}}$ at temperature$2000\,\,K$. The corresponding wavelength at a temperature of $3000\,\,K$ will be

A) $\frac{3}{2}{{\lambda }_{m}}$

B) $\frac{2}{3}{{\lambda }_{m}}$

C) $\frac{4}{9}{{\lambda }_{m}}$

D) $\frac{9}{4}{{\lambda }_{m}}$

• question_answer13) The potential field of an electric field $\mathbf{E}=(y\mathbf{i}+x\mathbf{j})$ is

A) $V=-(x+y)+$constant

B) $V=$constant

C) $V=-({{x}^{2}}+{{y}^{2}})+$constant

D) $V=-xy+$constant

• question_answer14) The $80\,\,\Omega$ galvanometer deflects full scale for a potentials of$20\,\,mV$. A voltmeter deflecting full scale of $5\,\,V$ is to made using this galvanometer. We must connect

A) a resistance of $19.92\,\,k\Omega$ parallel to the galvanometer

B) assistance of $19.92\,\,k\Omega$ in series with the galvanometer

C) a resistance of $20\,\,k\Omega$ parallel to the galvanometer

D) a resistance of $20\,\,k\Omega$ in series with galvanometer

• question_answer15) A current of $1\,\,A$ is passed through a straight wire of length$20\,\,m$. The magnetic field at a point air at a distance of $3\,\,m$ from either end of wire and lying on the axis of wire will be

A) $\frac{{{\mu }_{0}}}{2\pi }$

B) $\frac{{{\mu }_{0}}}{4\pi }$

C) $\frac{{{\mu }_{0}}}{8\pi }$

D) $zero$

• question_answer16) A short bar magnet placed with its axis at ${{30}^{o}}$ with a uniform external magnetic field of $0.16\,\,T$ experience a torque of magnitude$0.032\,\,J$. The magnetic moment of the bar magnet will be

A) $0.23\,\,J{{T}^{-1}}$

B) $0.40\,\,J{{T}^{-1}}$

C) $0.80\,\,J{{T}^{-1}}$

D) $zero$

• question_answer17) A coil has an area of $0.05\,\,{{m}^{2}}$ and has $800$ turns. After placing the coil in a magnetic field of strength $4\times {{10}^{-5}}Wb{{m}^{-2}}$ perpendicular to the field, the coil is rotated through ${{90}^{o}}$ in$0.1\,\,s$. The average emf induced is

A) $zero$

B) $0.016\,\,V$

C) $0.01\,\,V$

D) $0.032\,\,V$

• question_answer18) An alternating voltage (in volt) given by $V=200\sqrt{2}\sin (100t)$ is connected to $1\,\,\mu F$ capacitor through an $AC$ ammeter. The reading of the ammeter will be

A) $10\,\,mA$

B) $20\,\,mA$

C) $40\,\,mA$

D) $80\,\,mA$

• question_answer19) Instantaneous displacement current of $1.0\,\,A$ in the space between the parallel plates of $1\,\,\mu F$ capacitor can be established by changing potential difference of

A) ${{10}^{-6}}V/s$

B) ${{10}^{6}}V/s$

C) ${{10}^{-8}}V/s$

D) ${{10}^{8}}V/s$

• question_answer20) The maximum magnification that can be obtained with a convex lens of focal length $2.5\,\,cm$ is least distance of distinct vision is $25\,\,cm$

A) $10$

B) $0.1$

C) $62.5$

D) $11$

• question_answer21) The magnifying power of an astronomical telescope is $8$ and the distance between the two lenses is$54\,\,cm$. The focal length of eye lens and objective lens will be respectively

A) 6 cm and 48 cm

B) 48 cm and 6 cm

C) 8 cm and 64 cm

D) 6 cm and 60 cm

• question_answer22) The path difference between two wave fronts emitted by coherent sources of wavelength $5460\,\,\overset{\text{o}}{\mathop{\text{A}}}\,$ is $2.1$ micron. The phase difference between the wave fronts at that point is

A) $7.692\,\,rad$

B) $7.692\,\,\pi \,\,rad$

C) $\frac{7.692}{\pi }rad$

D) $\frac{7.692}{3\pi }rad$

• question_answer23) A photocell with a constant potential difference of $V$ volt across it is illuminated by a point source from a distance of$25\,\,cm$. When the source is moved to a distance of$1\,\,m$, the electrons emitted by the photocell

A) carry 1/4th their previous energy

B) are 1/6th as numerous as before

C) are 1/4th as numerous as before

D) carry 1/4th their previous momentum

• question_answer24) When an electron in hydrogen atom is excited from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck's constant$h=6.6\times {{10}^{-34}}Js)$

A) $4.16\times {{10}^{-34}}Js$

B) $3.32\times {{10}^{-34}}Js$

C) $1.05\times {{10}^{-34}}Js$

D) $2.08\times {{10}^{-34}}Js$

• question_answer25) Let $T$ be the mean life of a radioactive sample. $75%$ of the active nuclei present in the sample initially will decay in time

A) $2T$

B) $\frac{1}{2}(\ln 2)T$

C) $4T$

D) $2(\ln 2)T$

• question_answer26) A potential barrier of 0.50 V exists across a $p-n$ junction. If the depletion region is $5.0\times {{10}^{-7}}m$ wide, the strength of electric field in this region is

A) $1.0\times {{10}^{6}}V/m$

B) $1.0\times {{10}^{5}}V/m$

C) $2.0\times {{10}^{5}}V/m$

D) $2.0\times {{10}^{6}}V/m$

• question_answer27) What is an $AND$ gate?

A) It has not equivalence to switching circuit

B) It is equivalent to series switching circuit

C) It is equivalent to parallel switching circuit

D) It is a mixture of series and parallel switching

• question_answer28) A parachutist, drops first freely from an aero plane for $10\,\,s$ and then parachute opens out. Now he descends with a net retardation of$2.5\,\,m/{{s}^{2}}$. If. he bails out of the plane at a height of $2495\,\,m$ and $g=10\,\,m/{{s}^{2}}$, his velocity on reaching the ground will be

A) $5\,\,m/s$

B) $10\,\,m/s$

C) $15\,\,m/s$

D) $20\,\,m/s$

• question_answer29) A particle is moving along a circular path with uniform speed. Through what angle does it angular velocity change when it completes half of the circular path?

A) ${{0}^{o}}$

B) ${{45}^{o}}$

C) ${{180}^{o}}$

D) ${{360}^{o}}$

• question_answer30) Tick out the wrong statement.

A) Transverse waves can be generated in solids.

B) A system having ice floating on water has the same volume even after the ice is melted.

C) Heat radiations have the velocity of light.

D) Phase will not change when sound or light waves are reflected back.

• question_answer31) Two particles $P$ and $Q$ describe $SHM$ of same amplitude$a$, frequency $v$ along the same Straight line. The maximum distance between the two particles is$a\sqrt{2}$. The initial phase difference between the particles is

A) $zero$

B) $\pi /2$

C) $\pi /6$

D) $\pi /3$

• question_answer32) The magnitude of electric intensity $E$ is such that an electron placed in it would experience an electrical force equal to its weight. $E$ is given by

A) $mge$

B) $\frac{e}{mg}$

C) $\frac{mg}{e}$

D) $\frac{{{e}^{2}}g}{{{m}^{2}}}$

• question_answer33) In the figure, charge and the potential difference across the 4uF capacitor will be nearly

A) $600\mu C,\,\,150\,\,V$

B) $300\,\,\mu C,\,\,75\,\,V$

C) $800\,\,\mu C,\,\,200\,\,V$

D) $580\,\,\mu C,\,\,145\,\,V$

• question_answer34) A dip circle lies initially in the magnetic meridian. If it is now rotated through angle $\theta$ in the horizontal plane, then tangent of the angle of dip is changed in the ratio

A) $1:\cos \theta$

B) $\cos \theta :1$

C) $1:\sin \theta$

D) $\sin \theta :1$

• question_answer35) A $5\,\,cm$ long solenoid having $10\,\,\Omega$ resistance and $5\,\,mH$ inductance is joined to a $10\,\,V$ battery. At steady state, the current through the solenoid (in ampere) will be

A) $5$

B) $2$

C) $1$

D) $zero$

• question_answer36) A convex lens makes a real image $4\,\,cm$ long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is $16\,\,cm$ tall. The length of the object must be

A) $\frac{1}{4}cm$

B) $8\,\,cm$

C) $12\,\,cm$

D) $20\,\,cm$

• question_answer37) For a particle of mass $m$ enclosed in a one-dimensional box of length$L$, the de-Broglie concept would lead to stationary waves, with nodes at the two ends. The energy values allowed for such a system (with $n$ as integer) will be

A) $\frac{{{h}^{2}}}{8m{{L}^{2}}}{{n}^{2}}$

B) $\frac{{{h}^{2}}}{4m{{L}^{2}}}{{n}^{2}}$

C) $\frac{h}{4mL}n$

D) $\frac{{{h}^{2}}}{4m{{L}^{2}}}{{n}^{2}}$

• question_answer38) If no is the original mass of the substance of half-life period${{t}_{1/5}}=5\,\,yrs$, then the amount of substance left after 15 days is

A) $\frac{{{N}_{0}}}{8}$

B) $\frac{{{N}_{0}}}{16}$

C) $\frac{{{N}_{0}}}{2}$

D) $\frac{{{N}_{0}}}{4}$

• question_answer39) A doubled layered wall has layer$A$, $10\,\,cm$ thick and B, $20\,\,cm$ thick. The thermal conductivity of $A$ is thrice that of$B$. In the steady state, the temperature difference across the wall is${{35}^{o}}C$. The temperature difference across the layer $A$ is

A) ${{28}^{o}}C$

B) ${{14}^{o}}C$

C) ${{7}^{o}}C$

D) ${{5}^{o}}C$

• question_answer40) The mass of a planet is six times that of the earth. The radius of the planet is twice that of the earth. If the escape velocity from the earth is v, then the escape velocity from the planet is

A) $\sqrt{3}v$

B) $\sqrt{2}v$

C) $\sqrt{5}v$

D) $\sqrt{12}v$

• question_answer41) Power supplied to a particle of mass $2\,\,kg$ varies with time as$P=\frac{3{{t}^{2}}}{2}W$. Here $t$ is in second. If velocity of particle at $t=0$ is$v=0$, the velocity of particle at time$t=2\,\,s$ will be

A) $1\,\,m/s$

B) $4\,\,m/s$

C) $2\,\,m/s$

D) $2\sqrt{2}\,\,m/s$

• question_answer42) A particle is projected from the ground with an initial speed of $v$ at an angle $\theta$ with horizontally. The average velocity of the particle between its point of projection and highest point of trajectory is

A) $\frac{v}{2}\sqrt{1+2{{\cos }^{2}}\theta }$

B) $\frac{v}{2}\sqrt{1+2{{\cos }^{2}}\theta }$

C) $\frac{v}{2}\sqrt{1+3{{\cos }^{2}}\theta }$

D) $v\cos \theta$

• question_answer43) Given $\sigma$ is the compressibility of water, $p$ is the density of water and $k$ is the bulk modulus of water. What is the energy density of water at the bottom of a lake $h$ metre deep?

A) $\frac{1}{2}\sigma {{(h\rho g)}^{2}}$

B) $\frac{1}{2}\sigma (h\rho g)$

C) $\frac{1}{2}\frac{h\rho g}{\sigma }$

D) $\frac{h\rho g}{\sigma }$

• question_answer44) An ideal gas heat engine operates in a Carnot cycle between ${{227}^{o}}C$ and${{127}^{o}}C$. It absorbs $6.0\times {{10}^{4}}\,\,cal$ at the higher temperature. The amount of heat converted into work is equal to

A) $4.8\times {{10}^{4}}cal$

B) $3.5\times {{10}^{4}}cal$

C) $1.6\times {{10}^{4}}cal$

D) $1.2\times {{10}^{4}}cal$

• question_answer45) The latent heat of vaporisation of water is$2240\,\,J$. If the work done in the process of vaporisation of $1\,\,g$ is$168\,\,J$, then increases in internal energy is

A) $2408\,\,J$

B) $2240\,\,J$

C) $2072\,\,J$

D) $1904\,\,J$

• question_answer46) A body dropped from the top of a tower covers a distance $7x$ in the last second of its journey, where $x$ is the distance; covered in first second. How much time does it take to reach the ground?

A) $3\,\,s$

B) $4\,\,s$

C) $5\,\,s$

D) $6\,\,s$

• question_answer47) A body just dropped from a tower explodes into two pieces of equal mass in mid-air. Which of the following is not possible?

A) Each part will follow parabolic path

B) Only one part will follow parabolic path

C) Both parts move along a vertical line

D) One part reaches the ground earlier than the other

• question_answer48) Moment of inertia of a uniform circular disc about a diameter is$I$. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be

A) $5\,\,I$

B) $3\,\,I$

C) $6\,\,I$

D) $4\,\,I$

• question_answer49) Two sources $A$ and $B$ are sounding notes of frequency$680\,\,Hz$. A listener moves from $A$ to $B$ with a constant velocity$u$. If the speed of sound$340\,\,m/s$, what must be the value of $u$ so that he hears $10$ beats per second?

A) $2.0\,\,m/s$

B) $2.5\,\,m/s$

C) $3.0\,\,m/s$

D) $3.5\,\,m/s$

• question_answer50) A current of $1\,\,A$ flows in a circular area of wire which subtends an angle of $\left( \frac{3\pi }{4} \right)rad$ at its centre, whose radius is$R$. The magnetic induction $B$ at the centre is

A) $\frac{{{\mu }_{0}}I}{R}$

B) $\frac{{{\mu }_{0}}I}{2R}$

C) $\frac{2{{\mu }_{0}}I}{R}$

D) $\frac{3{{\mu }_{0}}I}{8R}$

• question_answer51) Which of the following compounds corresponds to van't Hoff factor $(i)$ to be equal to $2$ for dilute solution?

A) ${{K}_{2}}S{{O}_{4}}$

B) $NaHS{{O}_{4}}$

C) $Sugar$

D) $MgS{{O}_{4}}$

• question_answer52) $0.1\,\,M\,\,NaCI$ and $0.1\,\,M\,\,C{{H}_{3}}COOH$ are kept in separate containers. If their osmotic pressures are ${{p}_{1}}$ and ${{p}_{2}}$ respectively then what is the correct statement?

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

B) ${{p}_{1}}={{p}_{2}}$

C) ${{p}_{1}}<{{p}_{2}}$

D) ${{p}_{1}}={{p}_{2}}=0\,\,atm$

• question_answer53) Primary, secondary and tertiary alcohols may be distinguished by

A) Fehling solution

B) Victor-Meyer test

C) Hofmann test

D) Beilstein test

• question_answer54) Which of the following will respond to Cannizaro's reaction?

A) $2,\,\,2-$dimethylpropanal

B) Acetaldehyde

C) Propionaldehyde

D) Cinnamaldehyde

• question_answer55) Which one of the following will increase the voltage of the cell? $Sn(s)+2A{{g}^{+}}(aq)\xrightarrow{{}}S{{n}^{2+}}+(aq)+2Ag(s)$

A) Increase in the size of silver rod

B) Increasing the size of plate

C) Increase in the concentration of $A{{g}^{+}}$ ions

D) Increase in the concentration of $S{{n}^{2+}}$ ions

• question_answer56) Which among the following can be purified by steam distillation?

A) Phenol

B) Aniline

C) Benzoic acid

D) $p-$nitrophenol

• question_answer57) For a chemical reaction$A+BC$, the thermodynamic equilibrium constant ${{K}_{p}}$ is

A) in$at{{m}^{-2}}$

B) in$at{{m}^{-3}}$

C) in$at{{m}^{-1}}$

D) dimensionless

• question_answer58) If the equivalent, weight of a trivalent metal is $32.7$, the molecular weight of its chloride is

A) $68.2$

B) $103.7$

C) $204.6$

D) $32.7$

• question_answer59) Conjugate base of hydrazoic acid is

A) $HN_{3}^{-}$

B) $N_{2}^{-}$

C) $N_{3}^{-}$

D) ${{N}^{3-}}$

• question_answer60) The geometrical arrangement and shape of$I_{3}^{-}$ are respectively

A) trigonal bipyramidal geometry, linear shape

B) hexagonal geometry, T-shape

C) triangular planar geometry, triangular shape

D) tetrahedral geometry, pyramidal shape

• question_answer61) Sodium reacts with water more vigorously than $Li$ because it has

A) higher atomic mass

B) more electropositive character

C) metallic nature

D) more electronegative character

• question_answer62) When sodium is treated with sufficient oxygen/air, the product obtained is

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

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

C) $Na{{O}_{2}}$

D) $NaO$

• question_answer63) Gallium arsenide is purified by

A) froth floatation process

B) van-Arkel method

C) zone refining method

D) electrolytic method

• question_answer64) Which ion has the lowest radius from the following ions?

A) $N{{a}^{+}}$

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

C) $A{{l}^{3+}}$

D) $S{{i}^{4+}}$

• question_answer65) The extraction of which of the following metals involves bessemerisation?

A) Iron

B) Copper

C) Aluminium

D) Silver

A) ethylene glycol

B) phenol

C) ethanol

D) catechol

• question_answer67) Treatment of ammonia with excess of ethyl iodide will yield

A) diethylamine

B) ethylamine

C) triethylamine

D) tetraethylammonium iodide

• question_answer68) In the combustion of $2.0\,\,g$ $\text{of}$ methane, $25\,\,kcal$ heat is liberated. Heat of combustion of methane would be

A) $150\,\,kcal$

B) $200\,\,kcal$

C) $250\,\,kcal$

D) $350\,\,kcal$

• question_answer69) Arsenic sulphide is a negative sol. The reagent with least precipitating power is

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

B) $NaCl$

C) $Ca{{F}_{2}}$

D) glucose

• question_answer70) Which of the following salt when dissolved in water gets hydrolysed?

A) $NaCl$

B) $N{{H}_{4}}Cl$

C) $KCl$

D) $N{{a}_{2}}S{{O}_{4}}$

• question_answer71) $20\,\,mL$ of a $HCl$ solution exactly neutralises $40\,\,mL$ of $0.005\,\,N\,\,NaOH$ solution. The$pH$ of$HCl$. solution is

A) $2.5$

B) $2.0$

C) $1.5$

D) $1$

• question_answer72) Which of the following is used for inducing sleep?

A) Paracetamol

B) Chloroquine

C) Bithional

D) Barbituric acid derivatives

• question_answer73) Which of the following acids has the smallest dissociation constant?

A) $C{{H}_{3}}CHFCOOH$

B) $FC{{H}_{2}}C{{H}_{2}}COOH$

C) $BrC{{H}_{2}}C{{H}_{2}}COOH$

D) $C{{H}_{3}}CBrCOOH$

• question_answer74) Hydrolysis of benzonitrile by dilute $HCl$ yields

A) aniline

B) benzoic acid

C) berizamide

D) benzaldehyde

• question_answer75) Anti-Markownikoff's addition of $HBr$ is not observed in

A) propene

B) 1-butene

C) but-2-ene

D) pent-2-ene

• question_answer76) Kjeldahl's method can be used for estimation of nitrogen in

A) ${{C}_{6}}{{H}_{5}}N{{O}_{2}}$

B) pyridine

C) ${{C}_{6}}{{H}_{5}}-N=N-{{C}_{6}}{{H}_{5}}$

D) ${{C}_{6}}{{H}_{5}}N{{H}_{2}}$

• question_answer77) How many electrons in $19\,\,K$ have$n=3;\,\,l=0?$

A) $1$

B) $2$

C) $4$

D) $3$

A) similar to ionic bond

B) similar to covalent bond

C) neither similar to ionic nor covalent bond

D) formed by the movement of positively charged spheres in a sea of electrons

• question_answer79) Which of the following is not a Lewis base?

A) $C{{N}^{-}}$

B) $ROH$

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

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

• question_answer80) Hydrogen can have oxidation number/s of

A) $-1$only

B) $+1$only

C) $0$only

D) $-1,\,\,0,\,\,+1$

• question_answer81) $250\,\,mL$ of a sodium carbonate solution contains $2.65\,\,g$ of$N{{a}_{2}}C{{O}_{3}}$. If $10\,\,mL$ of this solution is diluted to$1\,\,L$, what is the concentration of the resultant solution? (Mol. wt. of$N{{a}_{2}}C{{O}_{3}}=106)$

A) $0.1\,\,M$

B) $0.001\,\,M$

C) $0.01\,\,M$

D) ${{10}^{-4}}M$

• question_answer82) At constant temperature, in a given mass of an ideal gas

A) the ratio of pressure and volume always remains constant

B) volume always remains constant

C) pressure always remains Constant

D) the product of pressure and volume always remains constant

• question_answer83) The rate of the reaction intermediates can be determined by the study of

A) catalyst effects

B) concentration of the reactants

C) temperature effects

D) solvent effects

• question_answer84) Order of reaction is decided by

A) temperature

B) mechanism of reaction

C) molecularity

D) pressure

• question_answer85) Which of the following conditions will always lead to a non-spontaneous change?

A) $+ve\Delta H$ and$+ve\Delta S$

B) $-ve\Delta H$and$-ve\Delta S$

C) $+ve\Delta H$ and$-ve\Delta S$

D) $-ve\Delta H$and$+ve\Delta S$

• question_answer86) The passage of current liberates ${{H}_{2}}$ at cathode and $C{{l}_{2}}$ at anode. The solution is

A) copper chloride in water

B) $NaCl$ in water

C) ferric chloride in water

D) $AuC{{l}_{3}}$ in water

• question_answer87) Compounds with ${{C}_{4}}{{H}_{11}}N$ as molecular formula can exhibit

A) position isomerism

B) metamerism

C) functional isomerism

D) All the three

• question_answer88) Which of the following species is nucleophile?

A) $\overset{+}{\mathop{N}}\,{{O}_{2}}$

B) $:C{{X}_{2}}$

C) $:\overset{\bullet \,\,\,\bullet }{\mathop{NH_{2}^{-}}}\,$

D) $\bullet C{{H}_{3}}$

• question_answer89) Which of the following carbocation is most stable?

A) $C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}$

B) $C{{H}_{2}}=\overset{+}{\mathop{C}}\,H$

C) $CH\equiv {{C}^{+}}$

D) ${{C}_{6}}H_{5}^{+}$

• question_answer90) Brown colour in $HN{{O}_{3}}$ can be removed by

A) adding $Mg$ powder

B) boiling the acid

C) passing $N{{H}_{3}}$ through acid

D) passing air through warm acid

• question_answer91) What products are expected from the disproportionation reaction of hypochlorous acid?

A) $HCl{{O}_{3}}$and$C{{l}_{2}}O$

B) $HCl{{O}_{2}}$and$HCl{{O}_{4}}$

C) $HCl$and$C{{l}_{2}}O$

D) $HCl$and$HCl{{O}_{3}}$

• question_answer92) Which of the following is not a wax?

A) Myricyl palmitate

B) Tripalmitin

C) Myricyl cerotate

D) Cetyl palmitate

• question_answer93) Which of the following ions forms most stable complex compound?

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

B) $M{{n}^{2+}}$

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

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

• question_answer94) Silver plating is carried out from which of the following?

A) $AgN{{O}_{3}}$

B) $AgCl$

C) $K[Ag{{(CN)}_{2}}]$

D) All of these

• question_answer95) Which one of the following is an example of non-typical transition elements?

A) $Li,\,\,K,\,\,Na$

B) $Be,\,\,Al,\,\,Pb$

C) $Zn,\,\,Cd,\,\,Hg$

D) $Ba,\,\,Ga,\,\,Sr$

• question_answer96) In the reaction,${{C}_{6}}{{H}_{6}}\xrightarrow[AlC{{l}_{3}}]{C{{H}_{3}}Cl}A\xrightarrow{KMn{{O}_{4}}}B$, $B$is

A) benzoic acid

B) benzoyl chloride

C) benzaldehyde

D) chlorobenzene

• question_answer97) The reaction,${{C}_{6}}{{H}_{5}}OH\xrightarrow[Pyridine]{C{{H}_{3}}COCl}{{C}_{6}}{{H}_{5}}COC{{H}_{3}}$is called

A) Reimer-Tiemann reaction

B) Schotten-Baumann reaction

C) acetylation

D) benzoylation

• question_answer98) Which of the following enzymes is not useful in the digestion of proteins?

A) Chymotripsin

B) Pepsin

C) Tripsin

D) Lipase

A) Ethyl alcohol and dimethyl ether

B) Acetone and acetaldehyde

C) Propionic acid and propanone

D) Methyl alcohol and dimethyl ether

• question_answer100) The dative bond is present in

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

B) $S{{O}_{3}}$

C) $PC{{l}_{5}}$

D) $B{{F}_{3}}$

• question_answer101) The sum of $i-2-3i+4...$ up to $100$ terms, where$i=\sqrt{-1}$is

A) $50(1-i)$

B) $25i$

C) $25(1+i)$

D) $100(1-i)$

• question_answer102) In a college examination, a candidate is required to answer $6$ out of $10$ questions which are divided into sections each containing $5$ questions. Further the candidate is not permitted to attempt more than $4$ questions from either of the section. The number of ways in which he can make up a choice of $6$ questions, is

A) $200$

B) $150$

C) $100$

D) $50$

• question_answer103) For the equations$x+2y+3z=1$,$2x+y+3z=2$, $5x+5y+9z=4$

A) there is only one solution

B) there exists infinitely many solution

C) there is no solution

D) None of the above

• question_answer104) If$a\ne p,\,\,b\ne q,\,\,c\ne r$and$\left| \begin{matrix} p & b & c \\ a & q & c \\ a & b & r \\ \end{matrix} \right|=0$. Then, the value of$\frac{p}{p-a}+\frac{q}{q-b}+\frac{r}{r-c}$is

A) $0$

B) $1$

C) $-1$

D) $2$

• question_answer105) If$\tan (\pi cos\theta )=cot(\pi sin\theta )$, then the value$(s)$ of$\cos \left( \theta -\frac{\pi }{4} \right)$is/are

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

B) $\frac{1}{\sqrt{2}}$

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

D) None of these

• question_answer106) Form the top of a light house $60\,\,m$ high with its base at the sea level, the angle of depression of a boat is${{15}^{o}}$. The distance of the boat form the foot of the light house is

A) $\left( \frac{\sqrt{3}-1}{\sqrt{3}+1} \right)60\,\,m$

B) $\left( \frac{\sqrt{3}+1}{\sqrt{3}-1} \right)60\,\,m$

C) $\left( \frac{\sqrt{3}+1}{\sqrt{3}-1} \right)m$

D) None of these

• question_answer107) Three lines $px+qy+r=0,\,\,qx+ry+p=0$ and $rx+py+q=0$ are concurrent, if

A) $p+q+r=0$

B) ${{p}^{2}}+{{q}^{2}}+{{r}^{2}}=pq+qr+rp$

C) ${{p}^{3}}+{{q}^{3}}+{{r}^{3}}=3pqr$

D) None of the above

• question_answer108) Find the angle between the lines represented by the equation${{x}^{2}}-2pxy+{{y}^{2}}=0$

A) ${{\cos }^{-1}}(p)$

B) ${{\sec }^{-1}}(p)$

C) ${{\sec }^{-1}}(-p)$

D) ${{\sec }^{-1}}(\pm p)$

• question_answer109) The length of the chord of the parabola ${{x}^{2}}=4ay$ passing through the vertex and having slope $\tan \alpha$ is

A) $4a\cos \text{ec}\alpha \cdot \cot \alpha$

B) $4a\tan \alpha \cdot \sec \alpha$

C) $4a\cos \alpha \cdot \cot \alpha$

D) $4a\sin \alpha \cdot \tan \alpha$

• question_answer110) If any tangent to the ellipse$\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1$ intercepts equal lengths I on the axes, then equals to

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

B) $\sqrt{{{a}^{2}}+{{b}^{2}}}$

C) ${{({{a}^{2}}+{{b}^{2}})}^{2}}$

D) None of these

• question_answer111) If the normal at $\left( ct,\,\,\frac{c}{t} \right)$ on the curve$xy={{c}^{2}}$ meets the curve again in$V$ , then

A) $t'=\frac{-1}{{{t}^{3}}}$

B) $t'=\frac{-1}{t}$

C) $t'=\frac{1}{{{t}^{2}}}$

D) $t{{'}^{2}}=\frac{-1}{{{t}^{2}}}$

• question_answer112) The line $\frac{x-2}{3}=\frac{y+1}{2}=\frac{z-1}{-1}$ intersects the curve$xy=c,\,\,z=0$, if $c$ equals to

A) $\pm 1$

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

C) $\pm \sqrt{5}$

D) None of these

• question_answer113) If$f(x)=\frac{1-x}{1+x}$, the domain of${{f}^{-1}}(x)$is

A) $R$

B) $R-\{-1\}$

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

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

• question_answer114) If$f'(2)=2$,$f''(2)=1$, then$\underset{x\to 2}{\mathop{\lim }}\,\frac{2{{x}^{2}}-4f'(x)}{x-2}$ is

A) $4$

B) $0$

C) $2$

D) $\infty$

• question_answer115) A function is denned as follows$f(x)=\left\{ \begin{matrix} {{x}^{m}}\sin \left( \frac{1}{x} \right), & x\ne 0 \\ 0, & x=0 \\ \end{matrix} \right\}$what condition should be imposed on m, so that $f(x)$ may be continuous$x=0?$

A) $m>0$

B) $m<0$

C) $m=0$

D) any value of$m$

• question_answer116) The value of$\lim {{(\cos x+a\sin bx)}^{1/x}}$is

A) $1$

B) $ab$

C) ${{e}^{ab}}$

D) ${{e}^{b/a}}$

• question_answer117) $\int{{{e}^{x}}}\left( \frac{x-1}{{{(x+1)}^{3}}} \right)dx$

A) $\frac{{{e}^{x}}}{x+1}+C$

B) $\frac{{{e}^{x}}}{{{(x+1)}^{2}}}+C$

C) $\frac{-{{e}^{x}}}{(x+1)}+C$

D) $\frac{-{{e}^{x}}}{{{(x+1)}^{2}}}+C$

• question_answer118) For which of the following values of$m$, is the area of the region bounded by the curve $y=x-{{x}^{2}}$ and the line $y=mx$ equals$9/2$.

A) $-4$

B) $3$

C) $2$

D) $4$

• question_answer119) Three numbers are chosen from $1$ to$30$. Find the probability that they are not consecutive.

A) $\frac{16}{81}$

B) $\frac{144}{145}$

C) $\frac{80}{145}$

D) $\frac{65}{81}$

• question_answer120) If$\frac{1+4p}{p},\,\,\frac{1-p}{2},\,\,\frac{1-2p}{2}$are probabilities of three mutually exclusive events, then

A) $\frac{1}{3}\le p\le \frac{1}{2}$

B) $\frac{1}{2}\le p\le \frac{2}{3}$

C) $\frac{1}{6}\le p\le \frac{1}{2}$

D) None of these

• question_answer121) A body starts from rest and moves with a uniform acceleration. The ratio of the distance covered in nth second to the distance covered in a n second is

A) $\frac{2}{n}-\frac{1}{{{n}^{2}}}$

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

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

D) $\frac{2}{n}+\frac{1}{{{n}^{2}}}$

• question_answer122) The equation ${{x}^{3}}-3x+4=0$ has only one real root. What is its first approximate value as obtained by the method of false position in$(-3,\,\,-2)$?

A) $-2.125$

B) $2.125$

C) $-2.812$

D) $2.812$

• question_answer123) If$z+{{z}^{-1}}=1$, then ${{z}^{100}}+{{z}^{-100}}$ is equal to

A) $i$

B) $-i$

C) $1$

D) $-1$

• question_answer124) If $a,\,\,b,\,\,c$ are in$G\,\,P$, then the equations $a{{x}^{2}}+2bx+c=0$ and $d{{x}^{2}}+2ex+f=0$ have a common root, if$\frac{d}{a},\,\,\frac{e}{b},\,\,\frac{f}{c}$are in

A) $AP$

B) $GP$

C) $HP$

D) None of these

• question_answer125) If the roots of the equation$\frac{1}{x+a}+\frac{1}{x+b}=\frac{1}{c}$ are equal in magnitude but opposite in sign, then their product is

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

B) $-\frac{1}{2}({{a}^{2}}+{{b}^{2}})$

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

D) $-\frac{1}{2}ab$

• question_answer126) The coefficient of $y$ in expansion of${{\left( {{y}^{2}}+\frac{c}{y} \right)}^{2}}$ is

A) $29c$

B) $10c$

C) $10{{c}^{3}}$

D) $20{{c}^{2}}$

• question_answer127) In the expansion of${{(1+x)}^{50}}$, the sum of the coefficients of odd powers of $x$ is

A) $0$

B) ${{2}^{49}}$

C) ${{2}^{50}}$

D) ${{2}^{51}}$

• question_answer128) If$\cos A=\tan B,\,\,\,\cos B=\tan C,\,\,\,\cos C=\tan A$, then $\sin A$ is equal to

A) $\sin {{18}^{o}}$

B) $2\sin {{18}^{o}}$

C) $2\cos {{18}^{o}}$

D) $2\cos {{36}^{o}}$

• question_answer129) If in a$\Delta ABC$,$\frac{2\cos A}{a}+\frac{\cos B}{b}+\frac{2\cos c}{c}=\frac{a}{bc}+\frac{b}{ca}$ then the value of the $\angle A$ is

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

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

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

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

• question_answer130) If$\tan (x+y)=33$and$x={{\tan }^{-1}}3$, then$y$will be

A) $0.3$

B) ${{\tan }^{-1}}(1.3)$

C) ${{\tan }^{-1}}(0.3)$

D) ${{\tan }^{-1}}\left( \frac{1}{18} \right)$

• question_answer131) If the algebraic sum of the perpendicular distances from the points $(2,\,\,0),\,\,\,(0,\,\,2)$ and $(1,\,\,1)$ to a variable straight line be zero, then the line passes through the point

A) $(-1,\,\,1)$

B) $(1,\,\,1)$

C) $(1,\,\,-1)$

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

• question_answer132) If the circles${{(x-a)}^{2}}+{{(y-b)}^{2}}={{c}^{2}}$and${{(x-b)}^{2}}+{{(y-a)}^{2}}={{c}^{2}}$touch each other, then

A) $a=b\pm 2c$

B) $a=b\pm \sqrt{2}c$

C) $a=b\pm c$

D) None of these

• question_answer133) The number of common tangents of the circles ${{x}^{2}}+{{y}^{2}}-2x-1=0$and${{x}^{2}}+{{y}^{2}}-2y-7=0$ is

A) $1$

B) $2$

C) $3$

D) $4$

• question_answer134) If$S=\sum\limits_{n=2}^{\infty }{^{n}{{C}_{2}}}\frac{{{3}^{n-2}}}{n!}$, then$2s$equals to

A) ${{e}^{3/2}}$

B) ${{e}^{3}}$

C) ${{e}^{-3/2}}$

D) ${{e}^{-3}}$

• question_answer135) The sum of the series $\frac{1}{2}{{x}^{2}}+\frac{2}{3}{{x}^{3}}+\frac{3}{4}{{x}^{4}}+\frac{4}{5}{{x}^{5}}+...$is

A) $\frac{x}{1+x}+\log (1+x)$

B) $\frac{x}{1-x}+\log (1-x)$

C) $-\frac{x}{1+x}+\log (1+x)$

D) None of these

• question_answer136) For any vector $\mathbf{a},\,\,|\mathbf{a}\times \mathbf{i}{{|}^{2}}+|\mathbf{a}\times \mathbf{j}{{|}^{2}}+|\mathbf{a}+\mathbf{k}{{|}^{2}}$ is equal to

A) $|\mathbf{a}{{|}^{2}}$

B) $2|\mathbf{a}{{|}^{2}}$

C) $3|\mathbf{a}{{|}^{2}}$

D) None of these

• question_answer137) If the unit vectors $a$ and $b$ are inclined at an angle $2\theta$ such that $|a-b|\,\,<1$ and$0\le \theta \le \pi$, then $\theta$ lies in the interval

A) $\left[ 0,\,\,\frac{\pi }{6} \right)$

B) $\left[ \frac{5\pi }{6},\,\,\pi \right]$

C) $\left[ \frac{\pi }{6},\,\,\frac{\pi }{2} \right]$

D) $\left[ \frac{\pi }{2},\,\,\frac{5\pi }{6} \right]$

• question_answer138) The vectors$\mathbf{a}=x\mathbf{i}+(x+1)\mathbf{j}+(x+2)\mathbf{k}$,$\mathbf{b}=(x+3)\mathbf{i}+(x+4)\mathbf{j}+(x+5)\mathbf{k}$ and$\mathbf{c}=(x+6)\mathbf{i}+(x+7)\mathbf{j}+(x+8)\mathbf{k}$are coplanar for

A) all values of$x$

B) only$x=1$

C) only$x=0$

D) None of these

• question_answer139) If$y={{\tan }^{-1}}\left( \frac{\sqrt{1+{{x}^{2}}}+\sqrt{1-{{x}^{2}}}}{\sqrt{1+{{x}^{2}}}-\sqrt{1-{{x}^{2}}}} \right)$, then$\frac{dy}{dx}$ equals to

A) $\frac{1}{\sqrt{1-{{x}^{4}}}}$

B) $\frac{-1}{\sqrt{1-{{x}^{4}}}}$

C) $\frac{x}{\sqrt{1-{{x}^{4}}}}$

D) $\frac{-x}{\sqrt{1-{{x}^{4}}}}$

• question_answer140) If the parametric equation of a curve given by$x={{e}^{t}}\cos t,\,\,y={{e}^{t}}\sin t$, then the tangent to the curve at the point $=\frac{\pi }{4}$ makes with axis of $x$, the angle is

A) $0$

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

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

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

• question_answer141) The function $f(x)=\frac{x}{\log x}$ increases on the interval

A) $(0,\,\,\infty )$

B) $(0,\,\,e)$

C) $(e,\,\,\infty )$

D) None of these

• question_answer142) If$f(x)={{\tan }^{-1}}\left\{ \frac{\log \left( \frac{e}{{{x}^{2}}} \right)}{\log (e{{x}^{2}})} \right\}+{{\tan }^{-1}}\left( \frac{1+2\log x}{1-2\log x} \right)$, then$\frac{dy}{dx}$is

A) ${{\tan }^{-1}}(\log x)$

B) $0$

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

D) None of these

• question_answer143) If${{I}_{m}}=\int_{1}^{x}{{{(\log x)}^{m}}dx}$satisfies the relation ${{I}_{m}}=K-l{{I}_{m-1}}$,then

A) $K=e$

B) $l=m$

C) $K=\frac{1}{e}$

D) None of these

• question_answer144) Let$I=\int_{0}^{1}{\frac{{{e}^{x}}}{x+1}dx}$, then the value of the integral $\int_{0}^{1}{\frac{x{{e}^{{{x}^{2}}}}}{{{x}^{2}}+1}dx}$is

A) ${{I}^{2}}$

B) $\frac{1}{2}I$

C) $2I$

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

• question_answer145) $\int_{0}^{1}{|\sin 2\pi x|dx}$is equal to

A) $0$

B) $-\frac{1}{\pi }$

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

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

• question_answer146) The differential equation of all conies whose centre is lie at the origin is of order

A) $2$

B) $3$

C) $4$

D) None of these

• question_answer147) The curve satisfying $y\,dx-xdx+\log \,\,x\,dx=0$ for $x>0$ and passing through$(1,\,\,-1)$is

A) $y=-1-\log x$

B) $y+\log x=0$

C) $y={{e}^{x}}-1$

D) None of the above

• question_answer148) The differential equation of$y=cx+2{{c}^{2}}$is

A) $y=x{{y}_{1}}+2y_{1}^{2}$

B) $y=x{{y}_{1}}-2y_{1}^{2}$

C) $y+x{{y}_{1}}=2y_{1}^{2}$

D) None of these

• question_answer149) Variance is independent to charge of

A) origin only

B) scale only

C) origin and scale both

D) None of the above

• question_answer150) The contrapositive of the statement$(\tilde{\ }p\Rightarrow \tilde{\ }q)$ is

A) $p\Rightarrow q$

B) $q\Rightarrow p$

C) $\tilde{\ }q\Rightarrow \tilde{\ }p$

D) $\tilde{\ }p\Rightarrow q$