AIEEE 2009 — 26 Apr Offline Set A (Previous Year Paper)

Statement-1: For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q. Statement-2: The net work done by a conservative force on an object moving along a closed loop is zero

1. A.Statement-1 is true, Statement-2 is false
2. B.Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.✓
3. C.Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
4. D.Statement-1 is false, Statement-2 is true

Correct answer: B

The above is a plot of binding energy per nucleon $E_b$, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions: (i) $A + B \rightarrow C + \epsilon$ (ii) $C \rightarrow A + B + \epsilon$ (iii) $D + E \rightarrow F + \epsilon$ and (iv) $F \rightarrow D + E + \epsilon$ where $\epsilon$ is the energy released? In which reactions is $\epsilon$ positive?

1. A.(i) and (iv)✓
2. B.(i) and (iii)
3. C.(ii) and (iv)
4. D.(ii) and (iii)

Correct answer: A

A p-n junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The current (I) in the resistor (R) can be shown by :

1. A.Graph (1): full sinusoid
2. B.Graph (2): full-wave rectified humps
3. C.Graph (3): half-wave rectified (alternate humps)✓
4. D.Graph (4): constant DC

Correct answer: C

The logic circuit shown below has the input waveforms 'A' and 'B' as shown. Pick out the correct output waveform.

1. A.Waveform (1)✓
2. B.Waveform (2)
3. C.Waveform (3)
4. D.Waveform (4)

Correct answer: A

If x, v and a denote the displacement, the velocity and the acceleration of a particle executing simple harmonic motion of time period T, then, which of the following does not change with time?

1. A.$a^2T^2 + 4\pi^2v^2$
2. B.$\frac{aT}{x}$✓
3. C.$aT + 2\pi v$
4. D.$\frac{aT}{v}$

Correct answer: B

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of $45^\circ$ with the x-axis meets the experimental curve at P. The coordinates of P will be

1. A.(2f, 2f)✓
2. B.$\left(\frac{f}{2}, \frac{f}{2}\right)$
3. C.(f, f)
4. D.(4f, 4f)

Correct answer: A

A thin uniform rod of length $\ell$ and mass m is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is $\omega$. Its centre of mass rises to a maximum height of

1. A.$\frac{1}{3}\frac{\ell^2\omega^2}{g}$
2. B.$\frac{1}{6}\frac{\ell\omega}{g}$
3. C.$\frac{1}{2}\frac{\ell^2\omega^2}{g}$
4. D.$\frac{1}{6}\frac{\ell^2\omega^2}{g}$✓

Correct answer: D

Let $P(r) = \frac{Q}{\pi R^4}r$ be the charge density distribution for a solid sphere of radius R and total charge Q. For a point 'p' inside the sphere at distance $r_1$ from the centre of the sphere, the magnitude of electric field is

1. A.0
2. B.$\frac{Q}{4\pi\epsilon_0r_1^2}$
3. C.$\frac{Qr_1^2}{4\pi\epsilon_0R^4}$✓
4. D.$\frac{Qr_1^2}{3\pi\epsilon_0R^4}$

Correct answer: C

The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

1. A.$2 \to 1$
2. B.$3 \to 2$
3. C.$4 \to 2$
4. D.$5 \to 4$✓

Correct answer: D

One kg of a diatomic gas is at a pressure of $8\times10^4$ N/m$^2$. The density of the gas is 4 kg/m$^3$. What is the energy of the gas due to its thermal motion?

1. A.$3\times10^4$ J
2. B.$5\times10^4$ J✓
3. C.$6\times10^4$ J
4. D.$7\times10^4$ J

Correct answer: B

A current loop ABCD is held fixed on the plane of the paper as shown in the figure. The arcs BC (radius = b) and DA (radius = a) of the loop are joined by two straight wires AB and CD. A steady current I is flowing in the loop. Angle made by AB and CD at the origin O is $30^\circ$. Another straight thin wire with steady current $I_1$ flowing out of the plane of the paper is kept at the origin. The magnitude of the magnetic field (B) due to loop ABCD at the origin (O) is

1. A.zero
2. B.$\frac{\mu_0I(b-a)}{24ab}$✓
3. C.$\frac{\mu_0I}{4\pi}\left[\frac{b-a}{ab}\right]$
4. D.$\frac{\mu_0I}{4\pi}\left[2(b-a) + \frac{\pi}{3}(a+b)\right]$

Correct answer: B

A current loop ABCD is held fixed on the plane of the paper as shown in the figure. The arcs BC (radius = b) and DA (radius = a) of the loop are joined by two straight wires AB and CD. A steady current I is flowing in the loop. Angle made by AB and CD at the origin O is $30^\circ$. Another straight thin wire with steady current $I_1$ flowing out of the plane of the paper is kept at the origin. Due to the presence of the current $I_1$ at the origin

1. A.The forces on AB and DC are zero
2. B.The forces on AD and BC are zero✓
3. C.The magnitude of the net force on the loop is given by $\frac{\mu_0II_1}{4\pi}\left[2(b-a) + \frac{\pi}{3}(a+b)\right]$
4. D.The magnitude of the net force on the loop is given by $\frac{\mu_0II_1}{24ab}(b-a)$

Correct answer: B

A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young's double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the $4^{th}$ bright fringe of the unknown light. From this data, the wavelength of the unknown light is

1. A.393.4 nm
2. B.885.0 nm
3. C.442.5 nm✓
4. D.776.8 nm

Correct answer: C

Two points P and Q are maintained at the potentials of 10V and -4V respectively. The work done in moving 100 electrons from P to Q is

1. A.$-19\times10^{-17}$ J
2. B.$9.60\times10^{-17}$ J
3. C.$-2.24\times10^{-16}$ J
4. D.$2.24\times10^{-16}$ J✓

Correct answer: D

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV nm)

1. A.3.09 eV
2. B.1.41 eV✓
3. C.151 eV
4. D.1.68 eV

Correct answer: B

A particle has an initial velocity $3\hat{i} + 4\hat{j}$ and an acceleration of $0.4\hat{i} + 0.3\hat{j}$. Its speed after 10 s is

1. A.10 units
2. B.$7\sqrt{2}$ units✓
3. C.7 units
4. D.8.5 units

Correct answer: B

A motor cycle starts from rest and accelerates along a straight path at 2 m/s$^2$. At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at 94% of its value when the motor cycle was at rest? (speed of sound = 330 ms$^{-1}$)

1. A.49 m
2. B.98 m✓
3. C.147 m
4. D.196 m

Correct answer: B

Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time and the height as function of time will be

1. A.Pair (1)
2. B.Pair (2)
3. C.Pair (3)✓
4. D.Pair (4)

Correct answer: C

A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then the Q/q equals

1. A.$-2\sqrt{2}$✓
2. B.$-1$
3. C.1
4. D.$-\frac{1}{\sqrt{2}}$

Correct answer: A

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature $\theta$ along the length x of the bar from its hot end is best described by which of the following figure.

1. A.Graph (1)
2. B.Graph (2)✓
3. C.Graph (3)
4. D.Graph (4)

Correct answer: B

A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}}$. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle $\theta$ for which the light ray grazes along the wall of the rod is

1. A.$\sin^{-1}\left(\frac{1}{2}\right)$
2. B.$\sin^{-1}\left(\frac{\sqrt{3}}{2}\right)$
3. C.$\sin^{-1}\left(\frac{2}{\sqrt{3}}\right)$
4. D.$\sin^{-1}\left(\frac{1}{\sqrt{3}}\right)$✓

Correct answer: D

Three sound waves of equal amplitudes have frequencies $(\nu - 1)$, $\nu$, $(\nu + 1)$. They superpose to give beats. The number of beats produced per second will be

1. A.4
2. B.3
3. C.2✓
4. D.1

Correct answer: C

The height at which the acceleration due to gravity becomes $\frac{g}{9}$ (where g = the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth is

1. A.2R✓
2. B.$\frac{R}{\sqrt{2}}$
3. C.$\frac{R}{2}$
4. D.$\sqrt{2}R$

Correct answer: A

Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire-2 has cross-sectional area 3A. If the length of wire 1 increases by $\Delta x$ on applying force F, how much force is needed to stretch wire 2 by the same amount?

1. A.F
2. B.4F
3. C.6F
4. D.9F✓

Correct answer: D

In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (= $0.5^\circ$), then the least count of the instrument is

1. A.one minute✓
2. B.half minute
3. C.one degree
4. D.half degree

Correct answer: A

An inductor of inductance L = 400 mH and resistors of resistances $R_1 = 2\,\Omega$ and $R_2 = 2\,\Omega$ are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is

1. A.$6e^{-5t}$ V
2. B.$\frac{12}{t}e^{-3t}$ V
3. C.$6\left(1 - e^{-t/0.2}\right)$ V
4. D.$12e^{-5t}$ V✓

Correct answer: D

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P-T diagram. The net work done on the gas in the cycle ABCDA is

1. A.Zero
2. B.276 R✓
3. C.1076 R
4. D.1904 R

Correct answer: B

Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?

1. A.Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
2. B.The ionic sizes of Ln (III) decrease in general with increasing atomic number.
3. C.Ln (III) compounds are generally colourless.✓
4. D.Ln (III) hydroxides are mainly basic in character.

Correct answer: C

A liquid was mixed with ethanol and a drop of concentrated $H_2SO_4$ was added. A compound with a fruity smell was formed. The liquid was :

1. A.$CH_3OH$
2. B.HCHO
3. C.$CH_3COCH_3$
4. D.$CH_3COOH$✓

Correct answer: D

Arrange the carbanions, $(CH_3)_3\bar{C}$, $\bar{C}Cl_3$, $(CH_3)_2\bar{C}H$, $C_6H_5\bar{C}H_2$, in order of their decreasing stability :

1. A.$C_6H_5\bar{C}H_2 > \bar{C}Cl_3 > (CH_3)_3\bar{C} > (CH_3)_2\bar{C}H$
2. B.$(CH_3)_2\bar{C}H > \bar{C}Cl_3 > C_6H_5\bar{C}H_2 > (CH_3)_3\bar{C}$
3. C.$\bar{C}Cl_3 > C_6H_5\bar{C}H_2 > (CH_3)_2\bar{C}H > (CH_3)_3\bar{C}$✓
4. D.$(CH_3)_3\bar{C} > (CH_3)_2\bar{C}H > C_6H_5\bar{C}H_2 > \bar{C}Cl_3$

Correct answer: C

The alkene that exhibits geometrical isomerism is :

1. A.propene
2. B.2-methyl propene
3. C.2-butene✓
4. D.2- methyl -2- butene

Correct answer: C

In which of the following arrangements, the sequence is not strictly according to the property written against it ?

1. A.$CO_2 < SiO_2 < SnO_2 < PbO_2$ : increasing oxidising power
2. B.HF < HCl < HBr < HI : increasing acid strength
3. C.$NH_3 < PH_3 < AsH_3 < SbH_3$ : increasing basic strength✓
4. D.B < C < O < N : increasing first ionization enthalpy

Correct answer: C

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :

1. A.benzoic acid
2. B.salicylaldehyde
3. C.salicylic acid✓
4. D.phthalic acid

Correct answer: C

Which of the following statements is incorrect regarding physissorptions ?

1. A.It occurs because of vander Waal's forces.
2. B.More easily liquefiable gases are adsorbed readily.
3. C.Under high pressure it results into multi molecular layer on adsorbent surface.
4. D.Enthalpy of adsorption ($\Delta H_{adsorption}$) is low and positive.✓

Correct answer: D

Which of the following on heating with aqueous KOH, produces acetaldehyde ?

1. A.$CH_3COCl$
2. B.$CH_3CH_2Cl$
3. C.$CH_2ClCH_2Cl$
4. D.$CH_3CHCl_2$✓

Correct answer: D

In an atom, an electron is moving with a speed of 600m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is ($h = 6.6\times10^{-34}$ kg m$^2$s$^{-1}$, mass of electron $= 9.1\times10^{-31}$ kg)

1. A.$1.52\times10^{-4}$ m
2. B.$5.10\times10^{-3}$ m
3. C.$1.92\times10^{-3}$ m✓
4. D.$3.84\times10^{-3}$ m

Correct answer: C

In a fuel cell methanol is used as fuel and oxygen gas is used as an oxidizer. The reaction is $CH_3OH(l) + \frac{3}{2}O_2(g) \rightarrow CO_2(g) + 2H_2O(l)$. At 298K standard Gibb's energies of formation for $CH_3OH(l)$, $H_2O(l)$ and $CO_2(g)$ are $-166.2$, $-237.2$ and $-394.4$ kJ mol$^{-1}$ respectively. If standard enthalpy of combustion of methanol is $-726$ kJ mol$^{-1}$, efficiency of the fuel cell will be

1. A.80 %
2. B.87%
3. C.90%
4. D.97%✓

Correct answer: D

Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mmHg) of X and Y in their pure states will be, respectively :

1. A.200 and 300
2. B.300 and 400
3. C.400 and 600✓
4. D.500 and 600

Correct answer: C

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301) :

1. A.230.3 minutes
2. B.23.03 minutes
3. C.46.06 minutes✓
4. D.460.6 minutes

Correct answer: C

Given : $E^\circ_{Fe^{3+}/Fe} = -0.036$ V, $E^\circ_{Fe^{2+}/Fe} = -0.439$ V. The value of standard electrode potential for the change, $Fe^{3+}(aq) + e^- \rightarrow Fe^{2+}(aq)$ will be :

1. A.$-0.072$ V
2. B.0.385 V
3. C.0.770 V✓
4. D.$-0.270$ V

Correct answer: C

On the basis of the following thermochemical data : ($\Delta_fG^\circ H^+_{(aq)} = 0$) $H_2O(l) \rightarrow H^+(aq) + OH^-(aq)$; $\Delta H = 57.32$ kJ; $H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)$; $\Delta H = -286.20$ kJ. The value of enthalpy of formation of $OH^-$ ion at $25^\circ$C is :

1. A.$-22.88$ kJ
2. B.$-228.88$ kJ✓
3. C.$+228.88$ kJ
4. D.$-343.52$ kJ

Correct answer: B

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

1. A.108 pm
2. B.127 pm✓
3. C.157 pm
4. D.181 pm

Correct answer: B

Which of the following has an optical isomer ?

1. A.$[Co(NH_3)_3Cl]^+$
2. B.$[Co(en)(NH_3)_2]^{2+}$
3. C.$[Co(H_2O)_4(en)]^{3+}$
4. D.$[Co(en)_2(NH_3)_2]^{3+}$✓

Correct answer: D

Solid $Ba(NO_3)_2$ is gradually dissolved in a $1.0\times10^{-4}$ M $Na_2CO_3$ solution. At what concentration of $Ba^{2+}$ will a precipitate begin to form ? ($K_{sp}$ for $BaCO_3 = 5.1\times10^{-9}$).

1. A.$4.1\times10^{-5}$ M
2. B.$5.1\times10^{-5}$ M✓
3. C.$8.1\times10^{-8}$ M
4. D.$8.1\times10^{-7}$ M

Correct answer: B

Which one of the following reactions of Xenon compounds is not feasible ?

1. A.$XeO_3 + 6HF \rightarrow XeF_6 + 3H_2O$✓
2. B.$3XeF_4 + 6H_2O \rightarrow 2Xe + XeO_3 + 12HF + 1.5O_2$
3. C.$2XeF_2 + 2H_2O \rightarrow 2Xe + 4HF + O_2$
4. D.$XeF_6 + RbF \rightarrow Rb[XeF_7]$

Correct answer: A

Using MO theory predict which of the following species has the shortest bond length ?

1. A.$O_2^{2+}$✓
2. B.$O_2^+$
3. C.$O_2^-$
4. D.$O_2^{2-}$

Correct answer: A

In context with the transition elements, which of the following statements is incorrect ?

1. A.In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
2. B.In the highest oxidation states, the transition metal show basic character and form cationic complexes.✓
3. C.In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and 3d electrons are used for bonding.
4. D.Once the $d^5$ configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.

Correct answer: B

Calculate the wavelength (in nanometer) associated with a proton moving at $1.0\times10^3$ ms$^{-1}$ (Mass of proton = $1.67\times10^{-27}$ kg and $h = 6.63\times10^{-34}$ Js) :

1. A.0.032 nm
2. B.0.40 nm✓
3. C.2.5 nm
4. D.14.0 nm

Correct answer: B

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

1. A.The solution formed is an ideal solution
2. B.The solution is non-ideal, showing +ve deviation from Raoult's law.✓
3. C.The solution is non-ideal, showing -ve deviation from Raoult's law.
4. D.n-heptane shows +ve deviation while ethanol shows -ve deviation from Raoult's law.

Correct answer: B

The number of stereoisomers possible for a compound of the molecular formula $CH_3-CH=CH-CH(OH)-Me$ is :

1. A.3
2. B.2
3. C.4✓
4. D.6

Correct answer: C

The IUPAC name of neopentane is

1. A.2-methylbutane
2. B.2, 2-dimethylpropane✓
3. C.2-methylpropane
4. D.2,2-dimethylbutane

Correct answer: B

The set representing the correct order of ionic radius is :

1. A.$Li^+ > Be^{2+} > Na^+ > Mg^{2+}$
2. B.$Na^+ > Li^+ > Mg^{2+} > Be^{2+}$✓
3. C.$Li^+ > Na^+ > Mg^{2+} > Be^{2+}$
4. D.$Mg^{2+} > Be^{2+} > Li^+ > Na^+$

Correct answer: B

The two functional groups present in a typical carbohydrate are :

1. A.-OH and -COOH
2. B.-CHO and -COOH
3. C.>C=O and -OH✓
4. D.-OH and -CHO

Correct answer: C

The bond dissociation energy of B - F in $BF_3$ is 646 kJ mol$^{-1}$ whereas that of C-F in $CF_4$ is 515 kJ mol$^{-1}$. The correct reason for higher B-F bond dissociation energy as compared to that of C-F is :

1. A.smaller size of B-atom as compared to that of C- atom
2. B.stronger $\sigma$ bond between B and F in $BF_3$ as compared to that between C and F in $CF_4$
3. C.significant $p\pi - p\pi$ interaction between B and F in $BF_3$ whereas there is no possibility of such interaction between C and F in $CF_4$.✓
4. D.lower degree of $p\pi - p\pi$ interaction between B and F in $BF_3$ than that between C and F in $CF_4$.

Correct answer: C

In Cannizzaro reaction given below $2PhCHO \xrightarrow{:OH^-} PhCH_2OH + PhCOO^-$ the slowest step is :

1. A.the attack of $:OH^-$ at the carboxyl group
2. B.the transfer of hydride to the carbonyl group✓
3. C.the abstraction of proton from the carboxylic group
4. D.the deprotonation of $PhCH_2OH$

Correct answer: B

Which of the following pairs represents linkage isomers ?

1. A.$[Cu(NH_3)_4][PtCl_4]$ and $[Pt(NH_3)_4][CuCl_4]$
2. B.$[Pd(PPh_3)_2(NCS)_2]$ and $[Pd(PPh_3)_2(SCN)_2]$✓
3. C.$[Co(NH_3)_5NO_3]SO_4$ and $[Co(NH_3)_5SO_4]NO_3$
4. D.$[PtCl_2(NH_3)_4]Br_2$ and $[PtBr_2(NH_3)_4]Cl_2$

Correct answer: B

Buna-N synthetic rubber is a copolymer of :

1. A.$H_2C=CH-C(Cl)=CH_2$ and $H_2C=CH-CH=CH_2$
2. B.$H_2C=CH-CH=CH_2$ and $H_5C_6-CH=CH_2$
3. C.$H_2C=CH-CN$ and $H_2C=CH-CH=CH_2$✓
4. D.$H_2C=CH-CN$ and $H_2C=CH-C(CH_3)=CH_2$

Correct answer: C

Let a, b, c be such that $b(a + c) \ne 0$. If $\begin{vmatrix} a & a+1 & a-1 \\ -b & b+1 & b-1 \\ c & c-1 & c+1 \end{vmatrix} + \begin{vmatrix} a+1 & b+1 & c-1 \\ a-1 & b-1 & c+1 \\ (-1)^{n+2}a & (-1)^{n+1}b & (-1)^nc \end{vmatrix} = 0$, then the value of 'n' is

1. A.zero
2. B.any even integer
3. C.any odd integer✓
4. D.any integer

Correct answer: C

If the mean deviation of number 1, 1 + d, 1 + 2d, ....., 1 + 100d from their mean is 255, then the d is equal to

1. A.10.0
2. B.20.0
3. C.10.1✓
4. D.20.2

Correct answer: C

If the roots of the equation $bx^2 + cx + a = 0$ be imaginary, then for all real values of x, the expression $3b^2x^2 + 6bcx + 2c^2$ is

1. A.greater than 4ab
2. B.less than 4ab
3. C.greater than -4ab✓
4. D.less than -4ab

Correct answer: C

Let A and B denote the statements A: $\cos\alpha + \cos\beta + \cos\gamma = 0$, B: $\sin\alpha + \sin\beta + \sin\gamma = 0$. If $\cos(\beta - \gamma) + \cos(\gamma - \alpha) + \cos(\alpha - \beta) = -\frac{3}{2}$, then

1. A.A is true and B is false
2. B.A is false and B is true
3. C.both A and B are true✓
4. D.both A and B are false

Correct answer: C

The lines $p(p^2 + 1)x - y + q = 0$ and $(p^2 + 1)^2x + (p^2 + 1)y + 2q = 0$ are perpendicular to a common line for

1. A.no value of p
2. B.exactly one value of p✓
3. C.exactly two values of p
4. D.more than two values of p

Correct answer: B

If A, B and C are three sets such that $A\cap B = A\cap C$ and $A\cup B = A\cup C$, then

1. A.A = B
2. B.A = C
3. C.B = C✓
4. D.$A\cap B = \phi$

Correct answer: C

If $\vec{u}, \vec{v}, \vec{w}$ are non-coplanar vectors and p, q are real numbers, then the equality $[3\vec{u}\ p\vec{v}\ p\vec{w}] - [p\vec{v}\ \vec{w}\ q\vec{u}] - [2\vec{w}\ q\vec{v}\ q\vec{u}] = 0$ holds for

1. A.exactly one value of (p, q)✓
2. B.exactly two values of (p, q)
3. C.more than two but not all values of (p, q)
4. D.all values of (p, q)

Correct answer: A

Let the line $\frac{x-2}{3} = \frac{y-1}{-5} = \frac{z+2}{2}$ lie in the plane $x + 3y - \alpha z + \beta = 0$. Then $(\alpha, \beta)$ equals

1. A.(6, -17)
2. B.(-6, 7)✓
3. C.(5, -15)
4. D.(-5, 15)

Correct answer: B

From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on the shelf so that the dictionary is always in the middle. Then the number of such arrangements is

1. A.less than 500
2. B.at least 500 but less than 750
3. C.at least 750 but less than 1000
4. D.at least 1000✓

Correct answer: D

$\int_0^\pi[\cot x]\,dx$, $[\cdot]$ denotes the greatest integer function, is equal to

1. A.$\frac{\pi}{2}$
2. B.1
3. C.$-1$
4. D.$-\frac{\pi}{2}$✓

Correct answer: D

For real x, let $f(x) = x^3 + 5x + 1$, then

1. A.f is one-one but not onto R
2. B.f is onto R but not one-one
3. C.f is one-one and onto R✓
4. D.f is neither one-one nor onto R

Correct answer: C

In a binomial distribution $B\left(n, p = \frac{1}{4}\right)$, if the probability of at least one success is greater than or equal to $\frac{9}{10}$, then n is greater than

1. A.$\frac{1}{\log_{10}4 - \log_{10}3}$✓
2. B.$\frac{1}{\log_{10}4 + \log_{10}3}$
3. C.$\frac{9}{\log_{10}4 - \log_{10}3}$
4. D.$\frac{4}{\log_{10}4 - \log_{10}3}$

Correct answer: A

The projections of a vector on the three coordinate axis are 6, -3, 2 respectively. The direction cosines of the vector are

1. A.6, -3, 2
2. B.$\frac{6}{5}, -\frac{3}{5}, \frac{2}{5}$
3. C.$\frac{6}{7}, -\frac{3}{7}, \frac{2}{7}$✓
4. D.$-\frac{6}{7}, -\frac{3}{7}, \frac{2}{7}$

Correct answer: C

If $\left|Z - \frac{4}{Z}\right| = 2$, then the maximum value of |Z| is equal to

1. A.$\sqrt{3} + 1$
2. B.$\sqrt{5} + 1$✓
3. C.2
4. D.$2 + \sqrt{2}$

Correct answer: B

Three distinct points A, B and C are given in the 2-dimensional coordinate plane such that the ratio of the distance of any one of them from the point (1, 0) to the distance from the point (-1, 0) is equal to $\frac{1}{3}$. Then the circumcentre of the triangle ABC is at the point

1. A.(0, 0)
2. B.$\left(\frac{5}{4}, 0\right)$✓
3. C.$\left(\frac{5}{2}, 0\right)$
4. D.$\left(\frac{5}{3}, 0\right)$

Correct answer: B