Question Paper (Section wise)

1) For a uniformly charged ring of radius R, the electric field on its axis has the largest magnitude at a distance h from its center. Then value of is:



R

R√2


2) Two coherent source 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:

16 : 9

25 : 9

4 : 1

5 : 3


3) Temperature difference of 120°C is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same crosssection as AB and length, is connected across AB (see figure). In steady state, temperature difference between P and Q will be closed to:

45°C

75°C

60°C

35°C


4) Two vectors have equal magnitudes. The magnitude of is ‘n‘ times the magnitude of. The angle between is:


5) The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of cornea (7.8 mm). This surface separates two media of refractive indices 1 and 1.34. Calculated the distance from the refracting surface at which a parallel beam of light will come to focus.

1 cm

2 cm

4.0 cm

3.1 cm


6) A closed organ pipe has a fundamental frequency of 1.5 kHz. The number of overtones that can be distinctly heard by a person with this organ pipe will be: (Assume that the highest frequency a person can hear is 20,000 Hz).

6

4

7

5


7) The equilateral triangle ABC is cut from a thin solid sheet of wood. (See figure) D, E and F are the mid points of its sides as shown and G is the centre of the triangle. The moment of inertia of the triangle about an axis passing through G and perpendicular to the plane of the triangle is I_{0}. If the smaller triangle DEF is removed from ABC, the moment of inertia of the remaining figure about the same axis is I. Then:


8) Ice at –20° C is added to 50 g of water at 40° C. When the temperature of the mixture reaches 0° C, it is found that 20 g of ice is still unmelted. The amount of ice added to the water was close to (Specific heat of water = 4.2 J/g/°C) Heat of fusion of water at 0°C = 334 J/g)

50g

100g

60g

40g


9) A gas mixture consists of 3 moles of oxygen and 5 moles or argon at temperature T. Considering only translational and rotational modes, the total internal energy of the system is:

15 RT

12 RT

4 RT

20 RT


10) In the figure, given that V_{BB} supply can vary from 0 to 5.0 V_{CC} = 5 V, β_{dc }= 200, R_{B} = 100 kΩ, R_{c} =1kΩ an V_{BE} = 1.0 V, The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively:

25 µA and 3.5 V

20 µA and 3.5 V

25 µA and 2.8 V

20 µA and 2.8 V


11) A long cylindrical vessel is half filled with a liquid. When the vessel is rotated about its own vertical axis, the liquid rises up near the wall. If the radius of vessel is 5 cm and its rotational speed is 2 rotations per second, then the difference in the heights between the centre and the sides, in cm, will be:

2.0

0.1

0.4

1.2


12) A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be: [Take g = 10 m/s^{2}]

2 kgm^{2}/s

8 kgm^{2}/s

6 kgm^{2}/s

3 kgm^{2}/s


13) A damped harmonic oscillator has a frequency of 5 oscillations per seconds. The amplitude drops to half its value for every 10 oscillations. The time it will take to drop to of the original amplitude is closed to:

10 s

100 s

50 s

20 s


14) The temperature, at which the root mean square velocity of hydrogen molecules equals their escape velocity form the earth is closest to:
[Boltzman’s Constant k_{B} = 1.38 × 10^{23} J/k
Avogadro number N˄ = 6.02 × 10^{26 /} kg
Radius of Earth: 6.4 × 10^{6 }m
Gravitation acceleration on Earth = 10 ms^{2}]

800k

10^{4} K

3 × 10^{5}

650 K


15) In the figure shown, what is the current (in Ampere) drawn from the battery? You are given R_{1 }= 15Ω, R_{2 }= 10 Ω, R_{3} = 20Ω, R_{4} = 5Ω, R_{5} = 25Ω, R_{6} = 30Ω, E = 15V

13/24

7/18

9/32

20/3


16) A uniform cable of mass ‘M’ and length ‘L’ is placed on a horizontal surface such that its part is hanging below the edge of the surface. To lift the hanging part of the cable up to the surface, the work done should be:

nMgL





17) A ball is thrown vertically up (taken as + zaxis) from the ground. The correct momentum height (ph) diagram is:


18) A wire of resistance R is bent to form a square ABCD as shown in the figure. The effective resistance between E and C is: (E is midpoint of arm CD)




R


19) A solid sphere of mass M and radius R is divided into two unequal parts. The first part has a mass of and is converted into a uniform disc of radius 2R. The second part is converted into a uniform solid sphere. Let l_{1} be the moment of inertia of the disc about its axis and l_{2} be the moment of inertia of the new sphere about its axis. The ratio of l_{1}/l_{2} is given by:

285

185

65

140


20) A metal coin of mass 5 g and radius 1 cm is fixed to a thin stick AB of negligible mass as shown in the figure. The system is initially at rest. The constant torque, that will make the system rotate about AB at 25 rotation per second is 5 s is close to

2.0 × 10^{5} Nm

4.0 × 10^{6} Nm

1.6 × 10^{5} Nm

7.9 × 10^{6} Nm


21) The figure shows a square loop L of side 5 cm which is connected to a network of resistances. The whole set up is moving towards right with a constant speed of 1 cms^{1} At some instant, a part of L is in a uniform magnetic field of 1 T, perpendicular to the plane of the loop. If the resistance of L is 1.7 Ω, the current in the loop at that instant will be close to _____ μA.

22) A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45°, and 40 times per minute where the dip is 30°. If B_{1} and B_{2} are respectively the total magnetic field due to the earth at the two places, then the approximate value of B_{1} is _____ T, when B_{2} is 50 T.

23) The trajectory of a projectile near the surface of the earth is given as y =x – 9x^{2}. For the given case the angle of projection with respect to ground is _____ °.

24) A load of mass M kg is suspended from a steel wire of length 2 m and radius 1.0 mm in Searle’s apparatus experiment. The increase in length produced in the wire is 4.0 mm. Now the load is fully immersed in a liquid of relative density 2. The relative density of the material of load is 8. The new value of increase in length of the steel wire is ______ mm.

25) An alphaparticle of mass m suffers 1deminisional elastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing, 64% of its initial kinetic energy. The mass of the nucleus is ______×m.

 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15

 16
 17
 18
 19
 20
 21
 22
 23
 24
 25

1) The major product of the following reaction is:


2) A water sample has ppm level concentration of the following metal:
Fe = 0.2, Mn = 5.0, Cu = 3.0, Zn = 5.0. The metal that makes the water sample unsuitable for drinking is.

Cu

Mn

Fe

Zn


3) The increasing order of pKa of following amino acids in aqueous solution is Gly, Asp, Lys, Arg

Asp < Gly < Arg < Lsy

Gly < Asp < Arg < Lsy

Asp < Gly < Lys < Arg

Arg < Lys < Gly < Asp


4) In the cell Pt_{(s)} H_{2(g,1bar)}HCl_{(aq)}AgCl_{(s)}Ag_{(s)}Pt_{(s)} the cell potential is 0.92V when a 10^{–6} molal HCl solution is used. The standard electrode potential of (AgCl/Ag,Cl^{} )
elctrode is :

0.94 V

0.76 V

0.40 V

0.20 V


5) For an elementary chemical reaction, the expression for is

k_{1}[A_{2}] – k_{1}[A]^{2}

2k_{1}[A_{2}]  k_{1}[A]^{2}

k_{1}[A_{2}] + k_{1}[A]^{2}

2k_{1}[A_{2}]  2k_{1}[A]^{2}


6) A compound of formula A_{2}B_{3} has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms:


7) Which compounds out of the following is/are not aromatic?

b, c and d

c and d

B

a and c


8) An example of solid sol is:

Paint

Gem stones

Butter

Hair cream


9) Match the metal column I with the coordination compounds/enzymes column II

a – iii, b – iv, c – i, d  ii

a – i, b – ii, c iii, d  iv

a – ii, b – i, c – iv, d  iii

a – iv, b – iii, c – i, d  ii


10) The magnetic moment of an octahedral homoleptic Mn(II) complex is 5.9 BM. The suitable ligand for this complex is:

ethylenediamine

CN^{}

NCS^{}

CO


11) The correct statement(s) among I to III with respect to potassium ions that are abundant within the cell fluids is/are:
 They activate many enzymes.
 They participate in the oxidation of glucose to produce ATP.
 Along with sodium ions, they are responsible for the transmission of nerve signals.

I and II only

I and III only

I, II and III

III only

12) For a certain reaction consider the plot of 𝓁nk versus 1/T given in the figure. If the rate constant of this reaction at 400 K is 10^{–5} s^{–1}, then the rate constant at 500 K is:

10^{6} s^{1}

2 × 10^{4}s^{1}

10^{4}s^{1}

4 ×10^{4}s^{1}


13) The structure of Nylon – 6 is:


14) The major product obtained in the following reactions is”


15) Consider the bcc unit cells of the solid 1 and 2 with the position of atoms as shown below. The radius of atom B is twice of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficency in solid 2?

90%

75%

65%

45%


16) The aerosol is a kind of colloid in which:

Solid is dispersed in gas

gas is dispersed in solid

liquid is dispersed in water

gas in dispersed in liquid


17) The given plots represents the variation of the concentration of a reactant R with time for two different reactions (i) and (ii). The respective orders of the reactions are:

1, 1

0, 2

0, 1

1, 0


18) Aniline dissolved in dilute HCl is reacted with sodium nitrite at 0^{° }C. This solution was added drop wise to a solution containing equimolar mixture of aniline and phenol in dil. HCl. The structure of the major products is:


19) The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are:

Lyman and Paschen

Brackett and Pfund

Paschen and Pfund

Balmer and Brackett


20) For the reaction,
2SO_{2(g)} + O_{2(g) }→ 2SO_{3(g)}
∆H= 57.2 kJ mol^{1} and
K_{C}=1.7×10^{16}
Which of the following statement is INCORRECT?

The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required.

The equilibrium will shift in forward direction as the pressure increase.

The equilibrium constant decreases as the temperature increases.

The addition of inert gas at constant volume will not affect the equilibrium constant.


21) The pH of a 0.02 M NH_{4}Cl solution will be
[given K_{b }(NH_{4}OH) = 10^{–5} and log 2 = 0.301]

22) In how many regions electrons are more likely to be found?

23) 5 moles of AB_{2} weigh 125 × 10^{3} kg and 10 moles A_{2}B_{2} weigh 300 × 10^{3} kg. The molar mass of A(M_{A}) and molar mass of B(M_{B}) in g mol^{1} are:

24) An element has a facecentred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is: a ⨯ ______.

25) Number of chiral Monochlorinated product/s obtained on chlorination of 2methylbutane is ______ .

 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15

 16
 17
 18
 19
 20
 21
 22
 23
 24
 25

1) If a, b and c be three distinct numbers in G.P. and a + b + c = xb then x cannot be

2

3

4

2


2) If then x is equal to:


3) The system of linear equation x + y + z = 2, 2x + 3y + 2z = 5, 2x + 3y + (a^{2 } 1) z = a + 1 then it…

is inconsistent when a = 4

has a unique solution for a = √3

has infinitely many solutions for a = 4

is inconsistent when a = √3


4) Let be two given vectors where are non collinear. The value of λ for which vectors are collinear, is:

4

3

4

3


5) If the probability of hitting a target by a shooter, in any shot, is then the minimum number of independent shots at the target required by him so that the probability of hitting the target at least once is greater than is

3

6

5

4


6) The plane which bisects the line segment joining the points (–3, –3, 4) and (3, 7, 6) at right angles, passes through which one of the following points?

(2, 3, 5)

(4, 1, 7)

(2, 1, 3)

(4, 1, 2)


7) If tangents are drawn to the ellipse x^{2 }+2y^{2} = 2 at all points on the ellipse other than its four vertices, then the mid points of the tangents intercepted between the coordinate axes lie on the curve:


8) If x log_{e }(log_{e }x) – x^{2} + y^{2} = 4 (y > 0), then at x = e is equal to:


9) Let f: R → R be defined by f (x) = , x ϵ R. Then the range of f is:


R – [1, 1


(1, 1) – {0}


10) The integral is equal to (where C is a constant of integration)


11) The tangent to the curve y = x^{2 } 5x + 5, parallel to line 2y = 4x + 1, also passes through the point:


12) The total number of irrational terms in the binominal expansion of (7^{1/5 }– 3^{1/10})^{60} is

55

49

48

54


13) If , then (1+iz+z^{5} +iz^{8})^{9} is equal to:

1

1

(1+2i)^{ 9}

0


14) The number of four – digit numbers strictly greater than 4321 that can be formed using the digits 0, 1, 2, 3, 4, 5 (repetition of digits is allowed) is:

360

288

310

306


15) The tangent and the normal lines at the point (√3, 1) to the circle x^{2}+ y^{2}= 4 and the x – axis form a triangle. The area of this triangle (in square units) is:


16) For any two statements p and q, the negation of the expression p ˅ (∼ p ˄ q ) is:

p ⟷ q

∼ p ˅ ∼q

∼ p ˄ ∼q

p ˄ q


17) If a tangent to the circle x^{2} + y^{2} = 1 intersects the coordinate axes at distinct points P and Q, then the locus of the mid point of PQ is:

x^{2} + y^{2} – 16x^{2}y^{2} = 0

x^{2} + y^{2} – 2x^{2}y^{2} = 0

x^{2} + y^{2} – 4x^{2}y^{2} = 0

x^{2} + y^{2} – 2xy = 0


18) If the function f defined on by
f (x) =
is continuous, then k is equal to:

1

2




19) The sum of real roots of the equation

4

0

6

1


20) The angles A, B and C of triangle ABC are in A. P. and a: b = 1:√3. If c = 4 cm, then the area (in sq. cm) of this triangle is

2√3


4√3



21) Let y = y (x) be the solution of the differential equation such that y (0) = 1. Then

22) Let f: R → R be a continuously differentiable function such that f (2) = 6 and f '(2) =. If is equal to:

23) If the data x_{1}, x_{2}, ...., x_{10} is such that the mean of first four of these is 11, the mean of the remaining six is 16 and the sum of squares of all of these is 2,000; then the standard deviation of this data is :

24) Let S_{n} denote the sum of the first n terms of an A.P. If S_{4} = 16 and S_{6} = –48, then S_{10} is equal to:

25) , then the local minimum value of h(x) is:

 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
 11
 12
 13
 14
 15

 16
 17
 18
 19
 20
 21
 22
 23
 24
 25