Solved papers for JEE Main & Advanced JEE Main Online Paper (Held On 09-Jan-2019 Morning)

done JEE Main Online Paper (Held On 09-Jan-2019 Morning)

  • question_answer1) A Mixture of 2 moles of helium gas\[\left( atomic\text{ }mass=4u \right)\], and 1 mole of argon gas \[\left( atomic\text{ }mass=40u \right)\] is kept at 300 K in a container. The ratio of their rms speeds \[\left[ \frac{{{V}_{rms}}\,(helium)}{{{V}_{rms}}\,(argon\,)} \right]\] , is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 0.32

    B) 3.16

    C) 2.24

    D) 0.45

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  • question_answer2) Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 25 : 9   

    B) 4 : 1

    C) 5 : 3             

    D) 16 : 9

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  • question_answer3) A sample of radioactive material A, that has an activity of \[10\text{ }mCi(1\text{ }Ci=3.7\times {{10}^{10}}\,decays/s)\], has twice the number of nuclei as another sample of different radioactive material B which has an activity of \[20\text{ }mCi\]. The correct choices for half-lives of A and B would then be respectively: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 10 days and 40 days

    B) 20 days and 10 days

    C) 5 days and 10 days

    D) 20 days and 5 days

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  • question_answer4) Temperature difference of \[120{}^\circ \,C\] is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same cross-section as AB and length \[\frac{3L}{2}\], is connected across AB (See figure). In steady  state,  temperature  difference between P and Q will be close to:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[45{}^\circ \,C\]

    B) \[75{}^\circ C\]

    C) \[35{}^\circ C\]

    D) \[60{}^\circ C\]

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  • question_answer5) A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 0.55 cm towards the lens

    B) 0

    C) 0.55 cm away from the lens

    D) 1.1 cm away from the lens

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  • question_answer6) For a uniformly charged ring of radius R, the electric field on its axis has the largest magnitude at a distance h from its centre. Then value of h is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[R\sqrt{2}\]

    B) R

    C) \[\frac{R}{\sqrt{5}}\]

    D) \[\frac{R}{\sqrt{2}}\]

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  • question_answer7) Drift speed of electrons, when \[1.5\text{ }A\] of current flows in a copper wire of cross section \[5\text{ }m{{m}^{2}}\], is v. If electron density in copper is \[9\times {{10}^{28}}/{{m}^{3}}\] the value of v in mm/s is close to (Take charge of electron to be \[=\text{ }1.6\times {{10}^{-19}}C)\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 0.02     

    B) 0.2

    C) 3                     

    D)      2

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  • question_answer8) A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, \[\overrightarrow{E}=6.3\text{ }\overrightarrow{j}\text{ }V/m\]. The corresponding magnetic field B, at that point will be [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[18.9\times {{10}^{-8}}\text{ }\widehat{k}T\]

    B) \[2.1\times {{10}^{-8}}\text{ }\widehat{k}T\]

    C) \[18.9\times {{10}^{8}}\text{ }\widehat{k}T\]   

    D) \[6.3\times {{10}^{-8}}\text{ }\widehat{k}T\]

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  • question_answer9) A gas can be taken from A to B via two different processes ACB and ADB. When path ACB is used 60 J of heat flows into the system and 30 J of work is done by the system. If path ADB is used work done by the system is 10 J. The heat Flow into the system in path ADB is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 40 J

    B) 20 J

    C) 100 J           

    D) 80 J

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  • question_answer10) A parallel plate capacitor is made of two square plates of side ?a?, separated by a distance\[d\left( d< [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{K{{\in }_{0}}{{a}^{2}}}{2d\,(K+1)}\]

    B) \[\frac{K{{\in }_{0}}{{a}^{2}}}{d\,(K-1)}\,\,In\,\,K\]

    C) \[\frac{K{{\in }_{0}}{{a}^{2}}}{d}\,\,In\,\,K\]

    D) \[\frac{1}{2}\,\,\,\frac{K{{\in }_{0}}{{a}^{2}}}{d}\]

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  • question_answer11) Surface of certain metal is first illuminated with light of wavelength \[{{\lambda }_{1}}=350\,nm\] nm and then, by light of wavelength \[{{\lambda }_{2}}=540nm\]. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to : (Energy of photon \[=\frac{1240}{\lambda \,(in\,\,nm)}\,e\,V)\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 5.6          

    B) 2.5

    C) 1.8                

    D) 1.4

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  • question_answer12) An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is \[d\left( d>>a \right)\]. If the loop applies a force F on the wire then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[F\propto \left( \frac{{{a}^{2}}}{{{d}^{3}}} \right)\]

    B) \[F\propto \left( \frac{a}{d} \right)\]

    C) \[F\,\,=\,\,0\]               

    D) \[F\propto {{\left( \frac{a}{d} \right)}^{2}}\]

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  • question_answer13) A heavy ball the mass M is suspended from the ceiling of a car by a right string of mass m \[\left( m<<M \right)\]. When the car is at rest, the speed of transverse waves in the string is\[60\text{ }m{{s}^{-1}}\]. When the car has acceleration a, the wave-speed increases to\[60.5\text{ }m{{s}^{-1}}\]. The value of a, in terms of gravitational acceleration g, is closest to:

    A) \[\frac{g}{20}\]

    B) \[\frac{g}{5}\]

    C) \[\frac{g}{10}\]

    D) \[\frac{g}{30}\]

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  • question_answer14) When the switch S, in circuit shown, is closed, then the value of current i will be:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 4 A   

    B) 5 A   

    C) 3 A   

    D) 2 A

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  • question_answer15) A current loop, having two circular arcs joined by two radial lines y shown in the figure. It carries a current of 10 A. The magnetic field at point 0 will be close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[~1.5\,\,\times \,\,\text{1}{{0}^{-5}}\,T\]     

    B) \[1.0\times {{10}^{-\,5}}\,T\]

    C) \[1.5\,\,\times \,\,{{10}^{-7}}\,T~\]  

    D) \[1.0\times \text{1}{{0}^{-7}}\,T\]

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  • question_answer16) Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is \[{{10}^{19}}{{m}^{-3}}\] and their mobility is \[1.6\text{ }{{m}^{2}}/\left( V.s \right)\] then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[0.4\text{ }\Omega \,m\]           

    B) \[2\text{ }\Omega \,m\]

    C) \[4\,\,\Omega \,m\]  

    D) \[0.2\,\,\Omega \,m\]

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  • question_answer17) Consider a tank made of glass (refractive index 1.5) with s. thick bottom. It is filled with a liquid of refractive index \[\mu \]. A student finds that, irrespective of what the incident angle I (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of \[\mu \] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\sqrt{\frac{5}{3}}\]

    B) \[\frac{4}{3}\]

    C) \[\frac{5}{\sqrt{3}}\]

    D) \[\frac{3}{\sqrt{5}}\]

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  • question_answer18) If the angular momentum of a planet of mass m, moving around the Sun in a circular orbit is L, about the center of the Sun, its areal velocity is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{L}{m}\]                 

    B) \[\frac{L}{2m}\]

    C) \[\frac{4L}{m}\]

    D) \[\frac{2L}{m}\]

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  • question_answer19) A block of mass 10 kg is kept on a rough inclined plane as shown in the figure. A force of 3 N is applied on the block. The coefficient of static friction between the plane and the block is 0.6. What should be the minimum value of force P, such that the block does not move downward? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 32 N            

    B) 25 N

    C) 23 N            

    D) 18 N

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  • question_answer20) A rod, of length L at room temperature and uniform area of cross section A, is made of a metal having coefficient of linear expansion \[a/{}^\circ C\]. It is observed that an external compressive force F, is applied on each of its ends, prevents any change in the length of the rod, when its temperature rises by \[\Delta \] TK. Young?s modulus, Y, for this metal is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{F}{A\alpha \Delta T}\]

    B) \[\frac{F}{2A\alpha \Delta T}\]

    C) \[\frac{2\,F}{A\alpha \Delta T}\]

    D) \[\frac{\,F}{A\alpha (\Delta T-273)}\]

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  • question_answer21) A particle is moving with a velocity \[\overrightarrow{v}=K\left( y\,\,\overrightarrow{i}+x\,\,\overrightarrow{j} \right)\], where K is a constant. The general equation for its path is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[y={{x}^{2}}+constant\]

    B) \[{{y}^{2}}=\text{ }{{x}^{2}}+constant\]

    C) \[{{y}^{2}}=\,\,x+constant\]

    D) \[xy\text{ }=\text{ }constant\]

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  • question_answer22) A conducting circular loop made of a thin wire, has area \[3.5\,\,\times \,\,{{10}^{-3}}\,{{m}^{2}}\] and resistance 100. It is placed perpendicular to a time dependent magnetic field\[B\left( t \right)=\left( 0.4T \right)sin\left( 50\pi t \right)\]. The field is uniform in space. Then the net charge flowing through the loop during \[t\,\,=\,\,0\] s and \[t\,\,=\,\,0\] ms is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 6 mC

    B) 14 mC

    C) 7 mC

    D) 21 mC

    E) None of These

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  • question_answer23) An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If \[\,AB=BC\], and the angle made by AB with downward vertical is \[\theta \], then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\tan \,\theta \,\,=\,\,\frac{1}{3}\]       

    B) \[\tan \,\theta \,\,=\,\,\frac{1}{2}\]

    C) \[\tan \,\theta \,\,=\,\,\frac{2}{\sqrt{3}}\]     

    D) \[\tan \,\theta \,\,=\,\,\frac{1}{2\sqrt{3}}\]

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  • question_answer24) A copper wire is stretcher! to make it \[0.5\,%\] longer. The percentage change m in its electrical resistance if its volume remain unchanged is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[0.5\text{ }%\]             

    B) \[2.5\text{ }%\]

    C) \[2.0\text{ }%\]             

    D) \[1.0\text{ }%\]

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  • question_answer25) Three charges +Q, q, +Q are placed respectively, at distance, 0, \[d/2\] and d from the origin, on the x-axis. If the net force experienced \[by+Q\], placed at \[x=0\], is zero then value of q is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) +Q/2           

    B) -Q/4

    C) +Q/4           

    D) -Q/2

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  • question_answer26) A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 2600 A/m      

    B) 1200 A/m

    C) 520 A/m       

    D) 285 A/m

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  • question_answer27) A resistance is shown in the figure. Its value and tolerance are given respectively by:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[270\text{ }\Omega ,\text{ }10\text{ }%\]    

    B) \[270\text{ }\Omega ,\text{ }5\text{ }%\]

    C) \[27\text{ }k\Omega ,\text{ }10\,%\]   

    D) \[27\text{ }k\Omega ,\text{ }20\,%\]

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  • question_answer28) A block of mass m, lying on a smooth horizontal surface, is attached to a spring (of negligible mass) of spring constant k. The other end of the spring is fixed, as shown in the figure. The block is initally at rest in its equilibrium position. If now the block is pulled with a constant force F, the maximum speed of the block is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{2F}{\sqrt{mk}}\]

    B) \[\frac{\pi \,F}{\sqrt{mk}}\]

    C) \[\frac{F}{\pi \,\sqrt{mk}}\]

    D) \[\frac{F}{\sqrt{mk}}\]

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  • question_answer29) Two masses m and \[\frac{m}{2}\] are connected at the two ends of a massless rigid rod of length l. The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system (see figure). Because of torsional constant k, the restoring torque is \[\tau \,\,=\,\,k\theta \] for angular displacement \[\theta \]. If the rod is rotated by \[{{\theta }_{0}}\] and released, the tension in it when it passes through its mean position will be: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{2\,k\,{{\theta }_{0}}^{2}}{l}\]

    B) \[\frac{k\,{{\theta }_{0}}^{2}}{l}\]

    C) \[\frac{3k\,{{\theta }_{0}}^{2}}{l}\]

    D) \[\frac{k\,{{\theta }_{0}}^{2}}{2\,l}\]

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  • question_answer30)   Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is given an initial speed v towards B due to which it collides with B perfectly inelastically \[\frac{5}{6}th\] of the initial kinetic energy is lost in whole process. What is value of M/m?   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 2                  

    B) 3

    C) 5                  

    D) 4

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  • question_answer31) In general the properties that decrease and increase down a group in the periodic table, respectively, are- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) electronegativity, and atomic radius.

    B) electronegativity and electron gain enthalpy.

    C) atomic radius and electronegativity.

    D) electron gain enthalpy and electronegativity.

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  • question_answer32) The major product of following reaction is: \[R-C\equiv N\,\,\xrightarrow[(2)\,\,{{H}_{2}}O]{(1)\,\,AlH\,{{(i-Bu)}_{2}}}\,\,?\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) RCHO

    B) RCOOH

    C) \[RCON{{H}_{2}}\]

    D) \[RC{{H}_{2}}N{{H}_{2}}\]

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  • question_answer33) Which amongst the following is the strongest acid? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[CHB{{r}_{3}}~\]

    B) \[CHC{{l}_{3}}\]

    C) \[CH{{\left( CN \right)}_{3}}\]

    D) \[CH{{I}_{3}}\]

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  • question_answer34) Arrange the following amines in the decreasing order of basicity:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[I>III>II\]    

    B) \[III>I>II\]

    C) \[I>II>III\]

    D) \[III>II>I\]

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  • question_answer35) The ore that contains both iron and copper is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) dolomite

    B) malachite

    C) copper pyrites 

    D) azurite

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  • question_answer36) The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of \[PbS{{O}_{4}}\] electrolyzed in g during the process is: (Molar mass of \[PbS{{O}_{4}}-=303\text{ }g\text{ }mo{{l}^{-1}}\]) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 15.2            

    B) 7.6

    C) 11.4            

    D) 22.8

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  • question_answer37) Correct statements among a to d regarding silicones are - (a) They are polymers with hydrophobic character. (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strength. (d) Usually, they are resistant to oxidation and used as greases. [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) (a), (b) and (d) only

    B) (a), (b) and (c) only

    C) (a), (b), (c) and (d)

    D) (a) and (b) only

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  • question_answer38) The following results were obtained during kinetic studies of the reaction: \[2A\,\,+\,\,B\,\,\to \] Products

    Experi-ment  in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\]  (in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\] Initial Rate of reaction (in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\] \[\mathbf{mi}{{\mathbf{n}}^{\mathbf{-1}}}\])
    I 0.10 0.20 \[6.93\,\,\times \,\,{{10}^{-3}}\]
    II 0.10 0.25 \[6.93\,\,\times \,\,{{10}^{-3}}\]
    III 0.20 0.30 \[1.386\,\,\times \,\,{{10}^{-2}}\]
    The time (in minutes) required to consume half of A is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 5                 

    B) 1

    C) 100             

    D) 10

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  • question_answer39) The major product of the following reaction is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A)

    B)

    C)

    D)

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  • question_answer40) The one that is extensively used as a piezoelectric material is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) mica

    B)           quartz

    C) amorphous silica

    D) tridymite

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  • question_answer41) 0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume \[10\text{ }{{m}^{3}}\] at 1000 K. Given R is the gas constant in \[J{{K}^{-1}}\,\,mo{{l}^{-1}}\], x is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{2R}{4-R}\]

    B) \[\frac{4+R}{2R}\]

    C) \[\frac{4-R}{2R}\]

    D) \[\frac{2R}{4+R}\]

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  • question_answer42) For emission line of atomic hydrogen from \[{{n}_{1}}=8\] to \[{{n}_{f}}=n\], the plot of wave number \[\left( \overline{v} \right)\] against \[\left( \frac{1}{{{n}^{2}}} \right)\] will be (The Rydberg constant, \[{{R}_{H}}\] is wave number unit) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) Linear with slope - \[{{R}_{H}}\]

    B) Linear with slope -\[{{R}_{H}}\]

    C) Non linear

    D) Linear with intercept - \[{{R}_{H}}\]

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  • question_answer43) Major product of the following reaction is:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A)  

    B)  

    C)  

    D)  

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  • question_answer44) The correct decreasing order for acid strength is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[N{{O}_{2}}C{{H}_{2}}COOH\text{ }>\text{ }FC{{H}_{2}}COOH\text{ }>CNC{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]

    B) \[CNC{{H}_{2}}COOH>{{O}_{2}}NC{{H}_{2}}COOH\text{ }>FC{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]

    C) \[FC{{H}_{2}}COOH>ClC{{H}_{2}}COOH>N{{O}_{2}}C{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]

    D) \[N{{O}_{2}}C{{H}_{2}}COOH>NCC{{H}_{2}}COOH>FC{{H}_{2}}COOH>ClC{{H}_{2}}COOH\]

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  • question_answer45) 20 mL of 0.1 M \[{{H}_{2}}S{{O}_{4}}\] solution is added to 30 mL of 0.2 M \[N{{H}_{4}}OH\] solution. The pH of the resultant mixture is: \[[p{{K}_{b}}\text{ }of\text{ }N{{H}_{4}}OH\,\,=\,\,4.7]\]. [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 5.2

    B) 9.4

    C) 9.0

    D) 5.0

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  • question_answer46) The alkaline earth metal nitrate that does not crystallize with water molecules, is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[Ba{{\left( N{{O}_{3}} \right)}_{2}}\]

    B) \[Mg{{\left( N{{O}_{3}} \right)}_{2}}\]

    C) \[Ca{{\left( N{{O}_{3}} \right)}_{2}}\]

    D) \[Sr{{\left( N{{O}_{3}} \right)}_{2}}\]

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  • question_answer47) Consider   the   reversible   isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and \[{{T}_{2}}\left( {{T}_{1}}<\text{ }{{T}_{2}} \right)\]. The correct graphical depiction of the dependence of work done (W) on the final volume (V) is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A)  

    B)

    C)  

    D)

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  • question_answer48) Adsorption of a gas follows Freundlich adsorption isotherm. IN the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure P. \[\frac{x}{m}\] is proportional to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) P

    B) \[{{P}^{1/2}}\]

    C) \[{{P}^{2}}\]

    D) \[{{P}^{1/4}}\]

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  • question_answer49) The increasing order of pKa of the following ammo acids in aqueous solution is: Gly Asp Lys Arg [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[Asp<Gly<Lys<Arg\]

    B) \[Arg<Lys<Gly<Asp\]

    C) \[Gly<Asp<Arg<Lys\]

    D) \[Asp<Gly<Arg<Lys\]

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  • question_answer50) According to molecular orbital theory, which of the following is true with respect to\[{{L}_{i2}}+and\text{ }{{L}_{i2}}-\]? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) Both are unstable

    B) Both are stable

    C) \[{{L}_{i2}}+\] is stable and \[{{L}_{i2}}-\] is unstable

    D) \[{{L}_{i{{2}^{+}}}}\]is unstable and \[{{L}_{i2}}-\] is stable

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  • question_answer51) A water sample has ppm level \[Fe=0.2\]; \[Mn=5.0\] ; \[Cu=3.0\] ; \[Zn=5.0\] The metal that makes the water sample unsuitable for drinking is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) Zn             

    B) Fe                 

    C) Cu             

    D) Mn

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  • question_answer52) Two complexes \[\left[ Cr{{\left( {{H}_{2}}0 \right)}_{6}} \right]C{{l}_{3}}\] and \[\left[ Cr{{\left( N{{H}_{3}} \right)}_{6}} \right]C{{l}_{3}}\] are violet and yellow coloured, respectively. The  incorrect statement regarding, them is- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[{{\Delta }_{0}}\] value for is less than that of (B).

    B) both absorb energies corresponding to their complementary colors.

    C) \[{{\Delta }_{0}}\] values of and are calculated. From the energies of violet and yellow light, respectively.

    D) both are paramagnetic with three unpaired electrons.

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  • question_answer53) The major product of the following reaction is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A)

    B)

    C)  

    D)

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  • question_answer54) Which one of the following statements regarding Henery's law is not correct? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) Different gases have different \[{{K}_{H}}\] (Henry's law constant) values at the same temperature.

    B) The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution.

    C) The value of \[{{K}_{H}}\] increases with increase of temperature and \[{{K}_{H}}\] is function of the nature of the gas.

    D) Higher the value of \[{{K}_{H}}\] at a given pressure, higher is the solubility of the gas in the liquids.

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  • question_answer55) The compound A and B in the following reaction are respectively: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) A = Benzyl alcohol, B = Benzyl cyanide

    B) A = Benzyl chloride, B = Benzyl cyanide

    C) A = Benzyl alcohol, B = Benzyl isocyanide

    D) A = Benzyl chloride, B = Benzyl isocyanide

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  • question_answer56) The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 6.93

    B) 5.92

    C) 4.90

    D) 3.87

    View Answer play_arrow
  • question_answer57) A solution of sodium sulfate contains \[92\text{ }g\text{ }of\text{ }N{{a}^{+}}\] ions per kilogram of water. The molality of \[N{{a}^{+}}\] ions in that solution in \[mol\text{ }k{{g}^{-1}}\] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 8

    B) 4

    C) 12

    D) 16

    View Answer play_arrow
  • question_answer58) The correct match between Item-I am Item-II is:

    Item-I (drug) Item-II (test)
    (A) Chlorozylenol (P) Carbolamine test
    (B) Norethindrone (Q) Sodium hydrogen carbonate test
    (C) Sulphapyridine (R) Ferric chlorine test
    (D) Penicillin (S) Bayer's test
      [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[A\to R;\,\,\,B\to S;\,\,\,C\to P;\,\,\,D\to Q\]

    B) \[A\to Q;\,\,\,B\to P;\,\,\,C\to S;\,\,\,D\to R\]

    C) \[A\to Q;\,\,\,B\to S;\,\,\,C\to P;\,\,\,D\to R\]

    D) \[A\to R;\,\,\,B\to P;\,\,\,C\to S;\,\,\,D\to Q\]

    View Answer play_arrow
  • question_answer59) The isotopes of hydrogen are: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) Protium and deuterium only

    B) Protium, deuterium and tritium

    C) Deuterium and tritium only

    D) Tritium and protium only

    View Answer play_arrow
  • question_answer60) Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and + 3 oxidation states. This is due to - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) diagonal relationship

    B) lanthanoid contraction

    C) inert pair effect

    D) lattice effect

    View Answer play_arrow
  • question_answer61) \[\underset{y\to 0}{\mathop{\lim }}\,\frac{\sqrt{1+\sqrt{1+{{y}^{4}}}}-\sqrt{2}}{{{y}^{4}}}\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) exists and equals \[\frac{1}{2\sqrt{2}}\]

    B) exists and equals \[\frac{1}{4\sqrt{2}}\]

    C) exists and equals \[\frac{1}{2\sqrt{2}(\sqrt{2}+1)}\]

    D) does not exist

    View Answer play_arrow
  • question_answer62) If a, b and c be three distinct real numbers in G.P. and \[a+b+c=xb\], then x cannot be: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) -2

    B) 2

    C) -3

    D) 4

    View Answer play_arrow
  • question_answer63) The maximum volume (in cu. m) of the right circular cone having slant height 3 m is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[6\pi \]

    B) \[\frac{4}{3}\pi \]

    C) \[2\sqrt{3}\,\pi \]

    D) \[3\sqrt{3}\,\pi \]

    View Answer play_arrow
  • question_answer64)

    The system of linear equations
    \[x+y+z=2\]
    \[2x+3y+2z=\text{ }5\]
    \[2x+3y+\left( {{a}^{2}}-1 \right)z\text{ }=\text{ }a+1\]
    [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) has infinitely many solutions for \[a=4\]

    B) has a unique solution for I a I \[=\,\,\sqrt{3}\]

    C) is inconsistent when I a I = \[=\,\,\sqrt{3}\]

    D) is inconsistent when \[a=4\]

    View Answer play_arrow
  • question_answer65) Let \[f:\,\,R\to R\] be a function defined as Then, f is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) continuous if \[a=0\] and \[b=5\]

    B) continuous if \[a=-5\] and \[b=10\]

    C) continuous if \[a=5\] and \[b=5\]

    D) not continuous for any values of a and b

    View Answer play_arrow
  • question_answer66) Axis of a parabola lies along x-axis. If its vertex and focus are at distance 2 and 4 respectively from the origin, on the positive x-axis then which of the following points does not lie on it? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\left( 8,\text{ }6 \right)\]

    B) \[\left( 4,\,-4 \right)\]

    C) \[(6,\,\,4\sqrt{2})\]

    D) \[(5,\,\,2\sqrt{6})\]

    View Answer play_arrow
  • question_answer67) Let \[\alpha \text{ }and\text{ }\beta \] be two roots of the equation \[{{x}^{2}}+2x+2=0\], then \[{{\alpha }^{15}}+{{\beta }^{15}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) -256

    B) 512

    C) -512

    D) 256  

    View Answer play_arrow
  • question_answer68) If the Boolean express. \[(p\oplus q)\,\,\wedge (\sim p\,\odot q)\] is equivalent to \[p\wedge q\], where \[\oplus ,\,\,\odot \,\,\in \{\wedge ,\,\,\vee \},\]then the ordered pair \[(\oplus ,\,\,\odot )\] is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[(\vee ,\,\,\,\vee )\]

    B) \[(\wedge ,\,\,\,\wedge )\]

    C) \[(\wedge ,\,\,\,\vee )\]

    D) \[(\vee ,\,\,\,\wedge )\]

    View Answer play_arrow
  • question_answer69) Let \[\overrightarrow{a}=\widehat{i}-\widehat{\text{j}}\,,\,\,\,\overrightarrow{b}=\widehat{i}+\widehat{j}+\widehat{k}\,\,\,and\,\,\overrightarrow{c}\,\] and be a vector such that \[\overrightarrow{a}\,\,\times \,\,\overrightarrow{c}\,\,+\,\,\overrightarrow{b}\,\,=\,\,\overrightarrow{0}\] and \[\overrightarrow{a}\text{ }.\text{ }\overrightarrow{c}\text{ }=4\], then \[{{\overrightarrow{\left| \,c\, \right|}}^{2}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{19}{2}\]

    B) 8

    C) \[\frac{17}{2}\]

    D) 9

    View Answer play_arrow
  • question_answer70) 5 students of a class have an average height 150 cm and variance \[18\text{ }c{{m}^{2}}\]. A new student, whose height is 156 cm, joined them. The variance (in \[c{{m}^{2}}\]) of the height of these six students is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 20

    B) 18

    C) 16

    D) 22

    View Answer play_arrow
  • question_answer71) For \[x\in R\text{ }-\left\{ 0,\text{ }1 \right\},\text{ }let\text{ }{{f}_{1}}\left( x \right)\,\,=\,\,\frac{1}{x}\,\,,\text{ }{{f}_{2}}\left( x \right)=1-x\] and \[{{f}_{3}}\left( x \right)=\frac{1}{1-x}\] be three given functions.  If a function, J(x) satisfies \[\left( fz\circ \text{ }J\circ \,\,{{f}_{1}} \right)\left( x \right)=\text{ }{{f}_{3}}\text{ }\left( x \right)\] then J(x) is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{1}{x}{{f}_{3}}\,(x)\]

    B) \[{{f}_{2}}\,(x)\]

    C) \[{{f}_{3}}\,(x)\]

    D) \[{{f}_{1}}\,(x)\]

    View Answer play_arrow
  • question_answer72) Let A= \[\left\{ \theta \in \left( -\frac{\pi }{2},\,\pi  \right):\,\frac{3+2i\,\,\sin \theta }{1-2i\,\,\sin \,\theta }\,is\,\,purely\,\,imaginary \right\}.\] Then the sum of the elements in A is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{5\pi }{6}\]

    B) \[\frac{3\pi }{4}\]

    C) \[\frac{2\pi }{3}\]

    D) \[\pi \]

    View Answer play_arrow
  • question_answer73) Consider a class of 5 girls and 7 boys. The number of different teams consisting of 2 girls and 3 boys that can be formed from this class, if there are two specific boys A and B, who refuse to be the members of the same team, is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 300            

    B) 500

    C) 200

    D) 350

    View Answer play_arrow
  • question_answer74) For any \[\theta \,\,\,\,\in \,\,\,\,\left( \frac{\pi }{4},\,\,\frac{\pi }{2} \right)\], the expression \[3{{\left( sin\,\theta -cos\,\theta  \right)}^{4}}+6{{\left( sin\,\theta +cos\,\theta  \right)}^{2}}+4\,si{{n}^{6}}\theta \]equals: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[13-4\,co{{s}^{4}}\theta +2\,si{{n}^{2}}\theta \,co{{s}^{2}}\theta \]

    B) \[13-4\,co{{s}^{2}}\theta +6\,si{{n}^{2}}\theta \,co{{s}^{2}}\theta \]

    C) \[13-4\text{ }cos{{\,}^{2}}\,\theta +6\,\,co{{s}^{4}}\,\theta \]

    D) \[13-4\text{ }cos{{\,}^{6}}\,\theta \]

    View Answer play_arrow
  • question_answer75) Equation of a common tangent to the circle \[{{x}^{2}}+{{y}^{2}}-6x=0\] and the parabola, \[{{y}^{2}}=4x\], is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\sqrt{3}y=x+3\]     

    B) \[\sqrt{3}y=3x+3\]

    C) \[2\sqrt{3}y=\,\,-x-12\]

    D) \[2\sqrt{3}\,y=12x+1\]

    View Answer play_arrow
  • question_answer76) Let \[{{a}_{1}},\text{ }{{a}_{2}},\text{ }.......,\text{ }{{a}_{30}}\] be an A.P., \[S=\sum\limits_{i\,=\,1}^{30}{{{a}_{i}}}\,\,and\,\,T\,\,=\,\,\sum\limits_{i\,=\,1}^{15}{{{a}_{(2i-1)}}}\]If \[{{a}_{5}}=27\] and \[S-2T=75\], then \[{{a}_{10}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 47   

    B) 42    

    C) 52    

    D) 57

    View Answer play_arrow
  • question_answer77) For \[{{x}^{2}}\ne n\pi \,+\,1,\,\,n\in N\] (the set of natural numbers), the integral \[\int{x\,\,\frac{2\,\sin \,({{x}^{2}}-1)\,\,-\,\sin 2\,({{x}^{2}}-1)}{2\,\sin \,({{x}^{2}}-1)+sin\,2({{x}^{2}}-1)}}\,dx\] is equal to: (where c is a constant of integration) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[{{\log }_{e}}\,\left| \sec \,\left( \frac{{{x}^{2}}-1}{2} \right) \right|\,\,+c\]

    B) \[{{\log }_{e}}\,\left| \frac{1}{2}{{\sec }^{2}}\,({{x}^{2}}-1) \right|\,\,+c\]

    C) \[\frac{1}{2}\,{{\log }_{e}}\,\left| {{\sec }^{2}}\,\left( \frac{{{x}^{2}}-1}{2} \right) \right|\,\,+c\]

    D) \[\frac{1}{2}\,{{\log }_{e}}\,\left| \sec ({{x}^{2}}-1) \right|\,\,+\,\,c\]

    View Answer play_arrow
  • question_answer78) Three circles of radii a, b, c (a < b < c) touch each other externally. If they have x-axis as a  common tangent, then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{1}{\sqrt{b}}\,\,=\,\,\frac{1}{\sqrt{a}}+\frac{1}{\sqrt{c}}\,\]

    B) a, b, c are in A. P.

    C) \[\sqrt{a},\,\,\sqrt{b},\,\,\sqrt{c}\,\,are\,\,in\,\,A.P.\]

    D) \[\frac{1}{\sqrt{a}}=\frac{1}{\sqrt{b}}+\frac{1}{\sqrt{c}}\]   

    View Answer play_arrow
  • question_answer79) If \[A\,\,=\,\,\left[ \begin{align}  & \cos \,\theta \,\,\,\,\,\,-\sin \theta  \\  & \sin \,\theta \,\,\,\,\,\,\,\,\,\,\,\cos \,\theta  \\ \end{align} \right]\] then matrix \[{{A}^{-50}}\] when \[\theta =\frac{\pi }{12}\], is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\left| \begin{align}   & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\  & -\frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\frac{1}{2} \\ \end{align} \right|\]

    B) \[\left| \begin{align}   & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,-\,\frac{\sqrt{3}}{2} \\  & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{2} \\ \end{align} \right|\]

    C) \[\left| \begin{align}   & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{2}\,\,\, \\  & -\frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\ \end{align} \right|\]

    D) \[\left| \begin{align}   & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\frac{1}{2}\,\,\, \\  & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\ \end{align} \right|\]

    View Answer play_arrow
  • question_answer80) If \[\cos {{\,}^{-1}}\,\left( \frac{2}{3x} \right)\,\,+\,\,\cos {{\,}^{-1}}\,\left( \frac{3}{4x} \right)\,=\,\frac{\pi }{2}\,\,\left( x>\frac{3}{4} \right)\,\] then x is equal to [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{\sqrt{145}}{10}\]

    B) \[\frac{\sqrt{145}}{11}\]

    C) \[\frac{\sqrt{145}}{12}\]

    D) \[\frac{\sqrt{146}}{12}\]

    View Answer play_arrow
  • question_answer81) If the fractional part of the number \[\frac{{{2}^{\,403}}}{15}\] is \[\frac{k}{15}\], then k is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 8     

    B) 14    

    C) 6     

    D) 4

    View Answer play_arrow
  • question_answer82) Consider the set of all lines \[px+qy+r=0\] such that \[3p+2q+4r=0\]. Which one of the following statements is true? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) The lines are not concurrent

    B) The lines are concurrent at the point\[\left( \frac{3}{4},\,\,\frac{1}{2} \right)\]

    C) The lines are all parallel

    D) Each line passes through the origin

    View Answer play_arrow
  • question_answer83) Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards. Let X denote the random variable of number of aces obtained in the two drawn cards. Then \[P\left( X=1 \right)+P\left( X=2 \right)\] equals:  [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) 25/169

    B) 24/169

    C) 49/169

    D) 52/169

    View Answer play_arrow
  • question_answer84) The equation of the line passing through \[\left( -4,\text{ }3,\text{ }1 \right)\], parallel to the plane \[x+2y-z-5=0\] and intersecting the line\[\frac{x+1}{-3}\,\,\,=\,\,\,\frac{y-3}{2}\,\,=\,\,\frac{z-2}{-1}\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{x+4}{3}\,\,\,=\,\,\,\frac{y-3}{-1}\,\,=\,\,\frac{z-1}{1}\]

    B) \[\frac{x+4}{1}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z-1}{3}\]

    C) \[\frac{x+4}{-1}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z-1}{1}\]

    D) \[\frac{x-4}{2}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z+1}{4}\]

    View Answer play_arrow
  • question_answer85)   The plane through the intersection of the planes \[x+y+z=1\text{ }and\text{ }2x+3y-z+4=0\] and parallel to y-axis also passes through the point: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) (- 3, 1, 1)        

    B) (-3, 0, -1)

    C) (3, 3, -1)         

    D) (3, 2, 1)

    View Answer play_arrow
  • question_answer86) If \[\theta \] denotes the acute angle between the curves, \[y=10-{{x}^{2}}\] and \[y=2+{{x}^{2}}\] at a point of their intersection, then \[\left| \tan \,\,\theta  \right|\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{4}{9}\]

    B) \[\frac{7}{17}\]

    C) \[\frac{8}{17}\]

    D) \[\frac{8}{15}\]

    View Answer play_arrow
  • question_answer87) The value of \[\int\limits_{0}^{\pi }{{{\left| \cos \,\,x \right|}^{3}}\,\,dx}\] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[-\frac{4}{3}\]

    B) 0

    C) \[\frac{4}{3}\]

    D) \[\frac{2}{3}\]

    View Answer play_arrow
  • question_answer88) The area (in sq. units) bounded by the parabola \[y={{x}^{2}}-1\], the tangent at the point (2, 3) to it and the y-axis is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{56}{3}\]

    B) \[\frac{32}{3}\]

    C) \[\frac{8}{3}\]

    D) \[\frac{14}{3}\]

    View Answer play_arrow
  • question_answer89) If \[y=y\left( x \right)\] is the solution of the differential  equation, \[x\frac{dy}{dx}\,\,+\,\,2y\,\,=\,\,{{x}^{2}}\] satisfying \[y\left( 1 \right)=1\],  then \[y\left( \frac{1}{2} \right)\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\frac{7}{64}\]

    B) \[\frac{49}{16}\]

    C) \[\frac{1}{4}\]

    D) \[\frac{13}{16}\]

    View Answer play_arrow
  • question_answer90) Let \[0<\theta <\frac{\pi }{2}\]. If the eccentricity of the hyperbola \[\frac{{{x}^{2}}}{{{\cos }^{2}}\theta }-\frac{{{y}^{2}}}{{{\sin }^{2}}\,\theta }\,\,=\,\,1\] is greater than 2, then the length of its latus rectum   lies in the interval: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]

    A) \[\left( 3,\text{ }\infty  \right)\]

    B) (1, 3/2]

    C) (3/2, 2]

    D) (2, 3]

    View Answer play_arrow

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