Official NEET UG 2007 Test

Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be:-

\(ML^2T^{–3}I^{–2}\)
\(ML^2T^{–3}I^{–1}\)
\(ML^2T^{–2}\)
\(ML^2T^{–1}I^{–1}\)

A particle moving along x-axis has acceleration f, at time t, given by

f = f0 , where f0 and T are constants. The particle at t = 0 has zero velocity. In the time interval between t = 0 and the instant when f = 0, the particle’s velocity (vx) is:

\(\frac{1}{2}f_0T\)
\(f_0T\)
\(\frac{1}{2}f_0T^2\)
\(f_0T^2\)

\(A car moves from X to Y with a uniform speed v_u and returns to Y with a uniform speed v_d. \)The average speed for this round trip is:-

\(\frac{v_u+ v_d}{2}\)
\(\frac{2v_u v_d}{v_u+ v_d}\)
\(\sqrt{v_u v_d}\)
\(\frac{v_u v_d}{v_u+ v_d}\)

A particle staring from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are\( (\sqrt{3},3) \). The path of the particle makes with the x-axis an angle of:-

0º
30º
45º
60º

A block B is pushed momentarily along a horizontal surface with an initial velocity v. If µ is the coefficient of sliding friction between B and the surface, block B will come to rest after a time:-

v/g
v/(gµ)
gµ/v
g/v

A vertical spring with force constant K is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is:-

\(mg(h-d)+\frac{1}{2}Kd^2\)
\(mg(h+d)+\frac{1}{2}Kd^2\)
\(mg(h+d)-\frac{1}{2}Kd^2\)
\(mg(h-d)-\frac{1}{2}Kd^2\)

A wheel as angular acceleration of 3.0 rad/sec^2 and initial angular speed of 2.00 rad/sec. In a time of 2 sec it has rotated through an angle (in radian) of :

4
6
10
12

\(\vec{A} and \vec{B} are two vectors and θ is the angle between them, if

|\vec{A}\times\vec{B}| =\sqrt{3}(\vec{A}.\vec{B})\) the value of θ is:-

90º
60º
45º
30º

The position x of a particle with respect to time t along x-axis is given by x = 9t^2 – t^3 where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction ?

24 m
32 m
54m
81m

A mass of 2.0 kg is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible. When pressed slightly and released the mass executes a simple harmonic motion. The spring constant is 200N/m. What should be the minimum amplitude of the motion so that the mass gets detached from the pan (Take g = 10 m/s^2 )

4.0 cm
8.0 cm
10.0 cm
Any value less than 12.0 cm

A particle of mass m moves in the XY plane with a velocity v along the straight line AB. If the angular momentum of the particle with respect to origin O is \(L_A when it is at A and L_B\) when it is at B, then :

\(\)L_A < L[/latex]
\(L_A > L_B\)
\(L_A = L_B\)
\(The relationship between L_A and L_B depends
upon the slope of the line AB\)

A uniform rod AB of length l and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is \(\frac{ml^{2}}{3}\)the initial angular acceleration of the rod will be:-

\(\frac{3g}{2l}\)
\(\frac{2g}{3l}\)
\(mg\frac{l}{2}\)
\(\frac{3}{2}gl\)

Two satellites of earth, S1 and S2, are moving in the same orbit. The mass of S1 is four times the mass of S2. Which one of the following statements is true ?

The kinetic energies of the two satellites are equal
\(The time period of S_1 is four times that of S_2\)
The potential energies of earth and satellite in
the two cases are equal
\(S_1 and S_2 are moving with the same speed\)

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature tºC, the power received by a unit surface, (normal to the incident rays) at distance R from the centre of the Sun is:-

Where \(\sigma\) is the Stefan’s Constant.

r^{2}\sigma(t + 273)4/R^{2}
4\pir^{2}\sigmat^{4}/R^{2}
r^{2}\sigma(t + 273)^{4 }/4\piR^{2}
16\pi^{2}r^{2}\sigmat^{4}/R^{2}

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62ºC, its efficiency is doubled. Temperature of the source is-

99ºC
124ºC
37ºC
62ºC

A black body is at 727ºC. It emits energy at a rate which is proportional to:

(727)^{4}
(727)^{2}
(1000)^{4}
(1000)^{2}

The frequency of a light wave in a material is \(2 × 10^{14}\) Hz and wavelength is 5000 Å. The refractive index of material will be:-

1.33
1.40
1.50
3.00

The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is:-

Zero
\(0.5\pi\)
\(\pi\)
\(0.707\pi\)

The particle executing simple harmonic motion has a ienetic energy K0 cos^{2}ωt. The maximum values of the potential energy and the total energy are respectively:-

\(K_0 and K_0\)
\(0 and 2K_0\)
\(\frac{K_0}{2}and K_0\)
\(K_0 and 2K_0\)

A particle executes simple harmonic oscillation with an amplitude a. The period of oscillation is T.The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is:

T/2
T/4
T/8
T/12

The electric and magnetic field of an electromagnetic wave are:-

in phase and perpendicular to each other
in phase and parallel to each other
in opposite phase and perpendicular to each other
in opposite phase and parallel to each other

A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface (see figure)

How fast is the light traveling in the liquid ?

\(1.2 × 10^{8}m/s\)
\(1.8 × 10^{8}m/s\)
\(2.4 × 10^{8}m/s\)
\(3.0 × 10^{8}m/s\)

Charge +q and –q are placed at points A and B respectively which are at distance 2L apart, C is the midpoint between A and B. The work done in moving a charge + Q along the semicircle CRD is:-

\(-\frac{qQ}{6\pi\epsilon_0 L}\)
\(\frac{qQ}{4\pi\epsilon_0 L}\)
\(\frac{qQ}{2\pi\epsilon_0 L}\)
\(\frac{qQ}{6\pi\epsilon_0 L}\)

A hollow cylinder has a charge q coulomb within it,If φ is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be-

\(\frac{q}{\epsilon_0}-\phi\)
\(\frac{1}{2}[\frac{q}{\epsilon_0}-\phi]\)
\(\frac{q}{2\epsilon_0}\)
\(\frac{\phi}{3}\)

Three point charges +q, –2q and +q are placed at points (x = 0, y = a, z = 0), (x = 0,y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:-

\(\sqrt{2}qa along + x direction\)
\(\sqrt{2}qa along + y direction\)
\(qa along the line joining points
(x = 0, y = 0, z = 0) and (x = a, y = a, z = 0)\)
\(qa along the line joining points
(x = 0, y = 0, z = 0) and (x = a, y = a, z = 0 )\)

Two condensers, one of capacity C and the other of capacity \(\frac{c}{2}\), are connected to a V-volt battery, as shown-

The work done in charging fully both the

condensers is:

\(\frac{1}{2}CV^2\)
\(2CV^2\)
\(\frac{1}{4}CV^2\)
\(\frac{3}{4}CV^2\)

The total power dissipated in watts in the circuit shown here is:-

4W
16W
40W
54W

A steady current of 1.5 amp flows through a

copper voltameter for 10 minutes. If the

electrochemical equivalent of copper is

\(30 × 10^{–5} gm coulomb^{–1}\), the mass of copper

deposited on the electrode will be: –

0.27 gm
0.40 gm
0.50 gm
0.67 gm

If the cold junction of a thermo-couple is kept at 0ºC and the hot junction is kept at TºC, then the relation between neutral temperature\( (T_n) and temperature of inversion (T_i)\) is:

Tn = Ti + T
Tn = Ti/2
Tn = 2Ti
Tn = Ti – T

Three resistances P, Q, R each of 2\(\Omega and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6\Omega\) is connected in parallel to S the bridge gets balanced. What is the value of S ?

\(1\Omega\)
\(2\Omega\)
\(3\Omega\)
\(6\Omega\)

The resistance of an ammeter is 13\(\Omega\) and its scale is graduated for a current upto 100 amps. After and additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is-

\(2 k\Omega\)
\(20\Omega\)
\(2\Omega\)
\(0.2\Omega\)

Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion-

depends on R and not on v
depends on v and not on R
depends on both R and v
is independent of both R and v

A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment µ is given by:

q v R
q v R/2
\(q v R^{2}\)
\(q v R^{2}/2\)

A beam of electrons passes undeflected through mutually perpendicular electric and magnetic fields. It the electric field is switched off, and the same magnetic field is maintained, the electrons move:

along a straight line
in an elliptical orbit
in a circular orbit
along a parabolic path

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux \(\Psi linked with the primary coil is given by \Psi = \Psi_0 + 4t, where \Psi is in webers, t is time in seconds and \Psi_0\) is a constant, the output voltage across the secondary coil is:

30 volts
90 volts
120 volts
220 volts

What is the value of inductance L for which the current is a maximum in a series LCR circuit with C = 10 \(\muF and ω = 1000s^{–1 }\)?

10 mH
100 mH
1 mH
cannot be calculated unless R is known

A transformer is used to light a 100 W and 110V lamp from a 220V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately-

10%
30%
50%
90%

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature then it will show:-

diamagnetism
paramagnetism
anti ferromagnetism
no magnetic property

A 5 watt source emits monochromatic light of wavelength 5000 Å. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photo electrons liberated will :

be reduced by a factor of 2
be reduced by a factor of 4
be reduced by a factor of 8
be reduced by a factor of 16

Monochromatic light of frequency\( 6.0 × 10^{14 }Hz is produced by a laser. The power emitted is 2 × 10^{–3}\)W. The number of photons emitted, on the average, by the source per second is:-

\(5 × 10^{14}\)
\(5 × 10^{15}\)
\(5 × 10^{16}\)
\(5 × 10^{17}\)

In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant,

the ratio \((\frac{charge on the ion}{mass of the ion}) \)will be proportional to:-

R
\(\frac{1}{R}\)
\(\frac{1}{R^{2}}\)
\(R^{2}\)

If the nucleus\(^{27}Al_ {13} has a nuclear radius of about 3.6 fm, the

^{125}Te_ {52}\)would have its radius approximately as:-

4.8 fm
6.0 fm
9.6 fm
12.0 fm

In radioactive decay process, the negatively charged emitted β-particles are:-

the electrons orbiting around the nucleus
the electrons present inside the nucleus
the electrons produced as a result of the decay of neutrons inside the nucleus
the electrons produced as a result of collisions between atoms

A nucleus \(^{A}X_{Z} has mass represented by

M(A,Z). If M_p and M_n\) denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then:

[/latex] B.E. = M(A,Z) – ZM_p – (A–Z) M_n[/latex]
[/latex] B.E. = [M(A, Z) – ZM_p – (A – Z) M_n]C^{2}[/latex]
[/latex]B.E. = [ZM_{p} + (A – Z)M_{n}– M(A, Z)]C^{2}[/latex]
[/latex]B.E. = [ZM_{p} + AM_{n} – M(A, Z)]C^{2}[/latex]

Two radioactive substances A and B have decay constants\(5\lambda and\lambda respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be

\frac({1}{e})^{2}\)after a time interval:-

\(\frac{1}{2\lambda}\)
\(\frac{1}{4\lambda}\)
\(4\lambda\)
\(2\lambda\)

The total energy of electron in the ground state of hydrogen atom is –13.6 eV. The kinetic energy of an electron in first excited state is:-

1.7 eV
3.4 eV
6.8 eV
13.6 eV

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is:-

an n-type semiconductor
a p-type semiconductor
an insulator
a metal

A common emitter amplifier has voltage gain of 50, an input impedance of \(100\Omega and an output impedance of 200 \Omega\). The power gain of the amplifier is:-

100
500
1000
1250

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table:-

For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct:

a= b = c and \alpha= \beta= \gamma = 90º
a\neq b \neq c and \alpha \neq \beta and \gamma \neq 90º
a \neq b \neq c and \alpha = \beta =\gamma =90º
a = b = c and \alpha \neq \beta \neq \gamma =90º

With which of the following electronic configuration of an atom has the lowest ionization enthalpy:

\(1s^{2}2s^{2}2p^{6}\)
\(1s^{2}2s^{2}2p^{5}\)
\(1s^{2}2s^{2}2p^{3}\)
\(1s^{2}2s^{2}2p^{5}3s^{1}\)

An element, X has the following isotopiccomposition;

\(^{200}X : 90%

^{199}X : 8.0%

^{202}X : 2.0%\)

The weighted average atomic mass of the naturally-occurring element X is closest to:

199 amu
200 amu
201 amu
202 amu

Concentrated aqueous sulphuric acid is 98% \(H_{2}SO_{4} by mass and has a density of 1.80 g.mL^{–1}. Volume of acid required to make 1 litre of 0.1 M H_{2}SO_{4} \)solution is:

5.55 mL
11.10 mL
16.65 mL
22.20 mL

Consider the following sets of quantum number:

n l m s

(a) 3 0 0 +½

(b) 2 2 1 +½

(c) 4 3 –2 –½

(d) 1 0 –1 –½

(e) 3 2 3 +½

Which of the following sets of quantum number is not possible:

a and c
b, c and d
a, b, c and d
b, d, and e

The number of moles of \(KMnO_{4} \)that will be needed to react with one mole of sulphite ion in acidic solution is:

1
\(\frac{3}{5}\)
\( \frac{4}{5}\)
\(\frac{2}{5}\)

In a first order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M then the half-life is:

\(\frac{ln2}{k]\)
\(\frac{0.693}{0.5k}\)
\(\frac{log2}{k}\)
\(\frac{log2}{k\sqrt{0.5}}\)

The reaction of hydrogen an iodine monochloride is given as

\( H_{2(g) }+ 2ICl_{(g)} → 2HCl_{(g)} + I_{2(g)}

This reaction is of first order with respect to H2(g)

and ICl_{(g)}, following mechanisms were proposed

Mechanism A:

H2(g) + 2ICl(g) → 2HCl(g) + I2(g)

Mechanism B :

H_{2(g)} + ICl_{(g)} → HCl_{(g)} + HI_{(g)} ; Slow

HI_{(g)} + ICl_{(g)} → HCl_{(g)} + I_{2(g)} \); Fast

Which of the above mechanism(s) can be consistent with the given information about the reaction:

A only
B only
A and B both
Neither A nor B

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately

(log 4 = 0.60, log 5 = 0.69)

40 minutes
50 minutes
45 minutes
60 minutes

The equilibrium constant of the reaction:

\( Cu(s) + 2Ag ^{+}(aq) → Cu^{2+}(aq) + 2Ag(s);

E^{º} = 0.46V at 298 K is:\)

\( 4.0 × 10^{15}\)
\( 2.4 × 10^{10}\)
\( 2.0 × 10^{10}\)
\( 4.0 × 10^{10}\)

\(0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If K_f for water is 1.86 K kg mol^{–1}\), the lowering in freezing point of the solution is:

–0.56 K
–1.12 K
0.56 K
1.12 K

The efficiency of a fuel cell is given by :

\(\frac{\bigtriangleup S}{\bigtriangleup G}\)
\(\frac{\bigtriangleup H}{\bigtriangleup G}\)
\(\frac{\bigtriangleup G}{\bigtriangleup S}\)
\(\frac{\bigtriangleup G}{\bigtriangleup H}\)

Consider the following reactions:

\(+ X_1 kJ mol^{–1}\)
\(– X_2 kJ mol^{–1}\)
\(+ X_3 kJ mol^{–1}\)
\(– X_4 kJ mo^{l–1}\)

Given that bond energies of H–H and Cl–Cl are

\(430 kJ mol^{–1} and 240 kJ mol^{–1} respectively and

\bigtriangleup_{f}H for HCl is –90 kJ mol^{–1}. Bond enthalpy of

HCl is :\)

\(245 kJ mol^{–1}\)
\(290 kJ mol^{–1}\)
\(380 kJ mol^{–1}\)
\(425 kJ mol^{–1}\)

The Langmuir adsorption isotherm is deduced using the assumption:

The adsorbed molecules interact with each other
The adsorption takes place in multilayer
The adsorption sites are equivalent in their ability to adsorb the particle
The heat of adsorption varies with coverage

The following equilibrium constants are given-

The equilibrium constant for the oxidation of

the NH\(^{3}\) by oxygen to give NO is:

\(\frac{K_{1}K_{2}}{K_{3}}\)
\(\frac{K_{2}K_{3}^{3}}{K_{1}}\)
\(\frac{K_{2}K_{3}^{2}}{K_{1}}\)
\(\frac{K_{2}^{2}K_{3}}{K1}\)

Calculate the pOH of a solution at 25ºC that

contains\( 1× 10^{–10} M of hydronium ions, i.e. H_{3}O^{+}\) ;

1.000
7.000
4.000
9.000

A weak acid HA has a \(K_{a} of 1.00 × 10^{–5}. If

0.100 mol of this acid is dissolved in one litre of

water the percentage of acid dissociated at

equilibrium is closest to :\)

0.100%
99.0%
1.00%
99.9%

The fraction of total volume occupied by the atoms present in a simple cube is:

\(\frac{\pi}{4}\)
\(\frac{\pi}{6}\)
\(\frac{\pi}{3\sqrt{2}}\)
\(\frac{\pi}{4\sqrt{2}}\)

Identify the correct order of the size of the following:

\(\)Ca^{2}+ < Ar < K^{+} < Cl^{–} < S^{2–}[/latex]
\(\)Ca^{2+} < K^{+} < Ar < S^{2}– < Cl^{–}[/latex]
\(\)Ca^{2+} < K^{+} < Ar < Cl^{–} < S^{2–}[/latex]
\(\)Ar < Ca^{2+} < K^{+} < Cl^{–} < S^{2–}[/latex]

In which of the following pairs, the two species are iso-structural ?

\(BrO^{-} _{3} and XeO_{3}\)
\(SF_{4} and XeF_{4}\)
\(SO^{2-}_{3} and NO^{-} _{3}\)
\(BF_{3} and NF_{3}\)

The correct order of C–O bond length among\(CO,^{2?}CO_{3}, CO_{2} is:\)

Which one of the following ionic species has the greatest proton affinity to form stable compound:

\(I^{-}\)
\(HS^{–}\)
\(N^{-}H_{2}\)
\(F^{–}\)

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true :

\(SrSO_{4}\)
\(BaSO_{4}\)
\(MgSO_{4}\)
\(RaSO_{4}\)

In which of the following the hydration energy is higher than the lattice energy:

\(SrSO_{4}\)
\(BaSO_{4}\)
\(MgSO_{4}\)
\(RaSO_{4}\)

The correct order of increasing thermal stability of \(K_{2}CO_{3}, MgCO_{3}, CaCO_{3} and BeCO_{3}\) is:

\(\)K_{2}CO_{3} < MgCO_{3} < CaCO_{3} < BeCO_{3}[/latex]
\(\)BeCO_[3} < MgCO_{3} < K_{2}CO_{3} < CaCO_{3}[/latex]
\(\)BeCO_{3} < MgCO_{3} < CaCO_{3} < K_{2}CO_{3}[/latex]
\(\)MgCO-{3} < BeCO-{3} < CaCO_{3} < K-{2]CO_{3}[/latex]

Sulphide ores of metals are usually concentrated by Froth Flotation process. Which one of the following sulphide ores offers and exception and is concentrated by chemical leaching ?

Sphalerite
Argentite
Galena
Copper pyrite

Which one of the following anions is present in the chain structure of silicates:

\(SiO^{4-} _{4}\)
\(Si_{2}O^{6-}_{7}\)
\((Si_{2}O^{2} _{5})_{n}\)
\((Si_{2}O^{2-} _{3})_{n}\)

Which one of the following orders correctly represents the increasing acid strengths of the given acids:

\(\)HOCIO_{3}
\(\)HOCI < HOCIO < HOCIO_{2} < HOCIO_{3}[/latex]
\(\)HOCIO < HOCI < HOCIO_{3} < HOCIO_{2}[/latex]
\(\)HOCIO_{2} < HOCIO_{3} < HOCIO < HOCI[/latex]

Which of the following oxidation states are the most characteristic for lead and tin respectively:

+2,+2
+4+2
+2+4
+4,+4

Identify the incorrect statement among the following

Shielding power of 4f electrons is quite weak
There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu
Lanthanoid contraction is the accumulation of successive shrinkages
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements

Which one of the following ions is the most stable in aqueous solution ?

(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)

\(Mn^{3+}\)
\(Cr^{3+}\)
\(V^{3+}\)
\(Ti^{3+}\)

The d electron configuration of \(Cr^{2+}, Mn^{2+}, Fe^{2+} and Ni^{2+} are 3d^{4} , 3d^{5} , 3d^{6} and 3d^{8}\) respectively. Which one of the following aqua complex will exhibit the minimum paramagnetic behaviour ?

(At. No. Cr = 24, Mn= 25, Fe = 26, Ni = 28)

\([Cr(H_{2}O)_{6}]^{2+}\)
\([Mn(H_{2}O)_{6}]^{2+}\)
\([Fe(H_{2}O)_{6}]^{2+}\)
\([Ni(H_{2}O)_{6}]^{2+}\)

Which of the following will give a pair of enantiomorphs:

\( (en = NH_{2} CH_{2} CH_{2} NH_{2})\)

\([Pt(NH_{3})_{4}][PtCl_{6}]\)
\([Co(NH_{3})_{4}Cl_{2}]NO_{2}\)
\([Cr(NH_{3})_{6}][Co(CN)_{6}]\)
\([Co(en)_{2}Cl_{2}]Cl\)

If NaCl is doped with\( 106{–4} mole% of SrCl_{2}, the concentrate of cation vacancies will be:

(N_{A} = 6.02 × 10^{23} mol^{–1})\)

\(6.02 × 10^{14} mol^{–1}\)
[latex]6.02 × 10^{15} mol^{–1}[/latex]
\(6.02 × 10^{16} mol^{–1}\)
\(6.02 × 10^{17} mol^{–1}\)

Which of the following presents the correct order of the acidity in the given compounds:

\(FCH_{2}COOH > ClCH_{2}COOH > BrCH_{2}COOH > CH_{3}COOH\)
\(CH_{3}COOH > BrCH_{2}COOH > ClCH_{2}COOH > FCH_{2}COOH\)
\(FCH_{2}COOH > CH_{3}COOH > BrCH_{2}COOH > ClCH_{2}COOH\)
\(BrCH_{2}COOH > ClCH_{2}COOH > FCH_{2}COOH
> CH_{3}COOH\)

The product formed in Aldol condensation is:

An alpha, beta unsaturated ester
A beta-hydroxy acid
A beta-hydroxy aldehyde or a beta-hydroxy ketone
An alpha-hydroxy aldehyde or ketone

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called:

Wolff-Kishner Reduction
Clemmensen Reduction
Cope Reduction
Dow Reduction

Consider the following compounds:

The correct decreasing order of their reactivity towards hydrolysis is:

(ii) > (iv) > (i) > (iii)
(ii) > (iv) > (iii) > (i)
(i) > (ii) > (iii) > (iv)
(iv) > (ii) > (i) > (iii)

Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid:

\(C_{6}H_{5}CH_{2}CHO\)
\(C_{6}H_{5}CHO\)
\(CH_{3}CH_{2}CH_{2}CHO\)

Which one of the following on reduction with lithium aluminium hydride yield a secondary amine:

Methyl Cyanide
Nitroethane
Methylisocyanide
Acetamide

The order decreasing reactivity towards an electrophilic reagent, for the following:

(a) Benzene

(b) Toluene

(c) Chlorobenzene and

(d) Phenol

Would be:

d > b > a > c
a > b > c > d
b > d > a > c
d > c > b > a

Predict the product C obtained in the following reaction of butyne-1:

Which of the compounds with molecular formula\( C_{5}H_{10}\) yields acetone on ozonolysis:

2-Methyl-1-butene
2-Methyl-2-butene
3-Methyl-1-butene
Cyclopentane

If there is no rotation of plane polarized light by a compound in a specific solvent, through to the chiral, it may mean that :

The compound may be a racemic mixture
The compound is certainly a chiral
The compound is certainly meso
There is no compound in the solvent

For the following:

\((a) I^{–} (b) Cl^{–} (c) Br^{–}\)

The increasing order of nucleophilicity would be:

\(\)Br^{-}< Cl^{–} < I^{–}[/latex]
\(\)I^{–} < Br^{–} < Cl^{–}[/latex]
\(\)Cl^{–} < Br^{–} < I^{–}[/latex]
\(\)I^{–} < Cl^{– }< Br^{–}[/latex]

\(CH^{3}–CHCl–CH^{2}–CH^{3}\)has a chiral centre, which one of the following represents its R configurations:

Which one of the following vitamins is water-soluble:

Vitamin A
Vitamin B
Vitamin E
Vitamin K

RNA and DNA are chiral molecules, their chirality is due to:

D-sugar Component
L-sugar component
Chiral bases
Chiral phosphate ester units

Which one of the following polymers is prepared by condensation polymerization?

Styrene
Nylon-66
Teflon
Rubber

Biological organization starts with:-

Atomic level
Submicroscopic molecular level
Cellular level
Organismic level

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:

Calcium and phosphorus
Phosphorus and sulphur
Sulphur and magnesium
Magnesium and sodium

Which one of the following is an example of negative feedback loop in humans ?

Secretion of sweat glands and constriction of skin blood vessels when it is too hot
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
Secretion of tears after falling of sand particles into the eye
Salivation of mouth at the sight of delicious food

What is common to whale, seal and shark ?

Homoeiothermy
Seasonal migration
Thick subcutaneous fat
Convergent evolution

Which one of the following is not a constituent of cell membrane ?

Phospholipids
Cholesterol
Glycolipids
Proline

Select the wrong statement from the following:

The chloroplasts are generally much larger than mitochondria
Both chloroplasts and mitochondria contain an inner and an outer membrane
Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
Both chloroplasts and mitochondria contain DNA

The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of:-

Nucleic acids
ATP in small stepwise units
ATP in one large oxidation reaction
Sugars

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:-

A skewed curve
A normal distribution
A bi-modal distribution
a T-shaped curve

Which one of the following is a slime mould ?

Anabaena
Rhizopus
Physarum
Thiobacillus

For a critical study of secondary growth in plants, which one of the following pairs is suitable?

Wheat and maiden hair fern
Sugarcane and sunflower
Teak and pine
Deodar and fern

Which one of the following statements about mycoplasma is wrong?

They cause diseases in plants
They are also called PPLO
They are pleomorphic
They are sensitive to penicillin

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result:

Self fertilization is prevented
There is no change in success rate of fertilization
There is high degree of sterility
One can conclude that the plant is apomictic

Two plants can be conclusively said to belong to the same species if they :

Have same number of chromosomes
Can reproduce freely with each other and form seeds
Have more than 90 percent similar genes
Look similar and possess identical secondary
metabolites.

If you are asked to classify the various algae into distinct groups, which of the following characters you should choose ?

Chemical composition of the cell wall
Types of pigments present in the cell
Nature of stored food materials in the cell
Structural organization of thallus

Flagellated male gametes are present in all the three of which one of the following sets ?

Riccia, Dryopteris and Cycas
Anthoceros, Funaria and Spirogyra
Zygnema, Saprolegnia and Hydrilla
Fucus, Marsilea and Calotropis

In gymnosperms, the pollen chamber represents:

The microsporangium in which pollen grains develop
A cell in the pollen grain in which the sperms are formed
A cavity in the ovule in which pollen grains are stored after pollination
An opening in the megagametophyte through which the pollen tube approaches the egg

Spore dissemination in some liverworts is aided by :

Peristome teeth
Elaters
Indusium
Calyptra

Which pair of the following belongs to Basidiomycetes ?

Morchella and Mushrooms
Birds’ nest fungi and Pufballs
Pufballs and Claviceps
Peziza and Stink horns

ICBN stands for :

Indian Code of Botanical Nomenclature
Indian Congress of Biological Names
International code of Botanical Nomenclature
International Congress of Biological Names

Ergot of rye is caused by a species of:-

Claviceps
Phytophthora
Uncinula
Ustilago

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:-

Convergent evolution
Divergent evolution
Microevolution
Co-evolution

Adaptive radiation refers to:-

Power of adaptation in an individual to a variety of environments
Adaptations due to Geographical isolation
Evolution of different species from a common ancestor
Migration of members of a species to different geographical areas

The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for:-

Growth and movement
Responsiveness to touch
Interaction with the environment and progressive evolution
Reproduction

The finches of Galapogas islands provide an evidence in favour of-

Biogeographical Evolution
Special Creation
Evolution due to Mutation
Retrogressive Evolution

One of the important consequences of geographical isolation is:-

Random creation of new species
No change in the isolated fauna
Preventing Speciation
Speciation through reproductive isolation

Industrial melanism as observed in peppered moth proves that:-

Melanism is a pollution-generated feature
The true black melanic forms arise by a recurring random mutation
The melanic form of the moth has no selective advantage over lighter form in industrial area
The lighter-form the moth has no selective advantage either in polluted industrial area or non-polluted area

The concept of chemical evolution is based on-

Possible origin of life by combination of chemicals under suitable environmental conditions
Crystallization of chemicals
Interaction of water, air and clay under intense heat
Effect of solar radiation on chemicals

Among the human ancestors the brain size was more than 1000 CC in:-

Homo habilis
Homo neanderthalensis
Homo erectus
Ramapithecus

Which of the following pairs are correctly matched ?

Only A and B
A, C and D
B, C and D
Only A and D

Select the correct statement from the following:

Mutations are random and directional
Darwinian variations are small and directionless
Fitness is the end result of the ability to adapt and gets selected by nature
All mammals except whales and camels have seven cervical vertebrae

Which one of the following is a matching pair of a body feature and the animal possessing it ?

Ventral heart – Scorpion
Post-anal tail – Octopus
Ventral central – Leech nervous system
Pharyngeal gill slits – Chamaeleon Absent in embryo

What is common between parrot, platypus and kangaroo ?

Ovoparity
Homoiothermy
Toothless jaws
Functional post-anal tail

What is true about Nereis, Scorpion, Cockroach and Silver fish ?

They all belong to the same phylum
They all have jointed paired appendages
They all possess dorsal heart
None of them is aquatic

Which one of the following statement is correct ?

Ontogeny repeats phylogeny
Stem cells are specialized cells
There is no evidence of the existence of gills during embryogenesis of mammals
All plant & animal cells are totipotent

“Foolish Seedling” disease of rice led to the discovery of :-

IAA
GA
ABA
2, 4-D

Passage cells are thin-walled cells found in:-

Central region of style through which the pollen tube grows towards the ovary.
Endodermis of roots facilitating rapid transport of water from cortex to pericycle
Phloem elements that serve as entry points for substances for transport to other plant parts
Testa of seeds to enable emergence of growing embryonic axis during seed germination.

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:-

Quinone
Cytochrome
Iron-sulphur protein
Ferredoxin

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:-

Succinate dehydrogenase
Lactate dehydrogenase
Isocitrate dehydrogenase
Malate dehydrogenase

The wavelength of light absorbed by Pr form of phytochrome is:-

620 nm
640 nm
680 nm
720 nm

Opening of floral buds into flowers, is a type of:

Autonomic movement of growth
Autonomic movement of locomotion
Autonomic movement of variation
Paratonic movement of growth

Which one of the following pairs, is not correctly matched ?

IAA – Cell wall elongation
Abscissic acid – Stomatal closure
Gibberellic acid – Leaf fall
Cytokinin – Cell division

One gene-one enzyme relationship was established for the first time in:

Diplococus pneumoniae
Neurospora crassia
Salmonella typhimurium
Escherichia Coli

Male gametes in angiosperms are formed by the division of:

Microspore mother cell
Microspore
Generative cell
Vegetative cell

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be:-

Movement of water from cell A to B
Movement of water from cell B to A
No movement of water
Equilibrium between the two

In the leaves of \(C_{4} plants, malic acid formation during CO_{2} \)fixation occurs in the cells of :

Epidermis
Mesophyll
Bundle Sheath
Phloem

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism ?

Cicer arietinum
Casuarina equisetifolia
Crotalaria juncea
Cycas revoluta

Which one of the following is surrounded by a callose wall ?

Pollen grain
Microspore mother cell
Male gamete
Egg

Which one of the following elements is not an essential micronutrient for plant growth ?

Ca
Mn
Zn
Cu

If you suspect deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence ?

Haemocytes
Serum albumins
Serum globulins
Fibrinogen in the plasma

Which one of the following is a fat-soluble vitamin and its related deficiency disease ?

Calciferol – Pellagra
Ascorbic acid – Scurvy
Retinol – Xerophthalmia
Cobalamine – Beri-beri

Which one of the following mammalian cells is not capable of metabolizing glucose to carbon- dioxide aerobically ?

Red blood cells
White blood cells
Unstriated muscle cells
Liver cells

Compared to a bull a bullok is docile because of:-

Lower levels of adrenalin/noradrenalin in its blood
Higher levels of thyroxin
Higher levels of cortisone
Lower levels of blood testosterone

In the human female, menstruation can be deferred by the administration of:-

FSH only
LH only
Combination of FSH and LH
Combination of estrogen and progesterone

In human body, which one of the following is anatomically correct ?

Cranial nerve – 10 pairs
Floating ribs – 2 pairs
Collar bones – 3 pairs
Salivary glands – 1 pair

In which one of the following preparations are you likely to come across cell junctions most frequently ?

Hyaline cartilage
Ciliated epithelium
Thrombocytes
Tendon

A drop of each of the following, is placed separately on four slides. Which of them will not coagulate ?

Whole blood from pulmonary vein
Blood plasma
Blood serum
Sample from the thoracic duct of lymphatic system

Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoried building starts climbing down the stairs rapidly. Which hormone initiated this action ?

Gastrin
Thyroxin
Adrenaline
Glucagon

A person who is on a long hunger strike and is surviving only on water, will have:-

Less urea in his urine
More sodium in his urine
Less amino acids in his urine
More glucose in his blood

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell ?

Nucleus and mitochondria
Perikaryon and dendrites
Vacuoles and fibres
Flagellum and medullary sheath

Which part of ovary in mammals acts as an endocrine gland after ovulation ?

Vitelline membrane
Graffian follicle
Stroma
Germinal epithelium

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge ?

First positive, then negative and again back to positive
First negative, then positive and again back to negative
First positive, then negative and continue to be negative
First negative, then positive and continue to be positive

A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly ?

Thyroid
Parathyroid
Parotid
Pancreas

Identify the odd combination of the habitat and the particular animal concerned :

Rann of Kutch – Wild Ass
Dachigam National Park – Snow Leopard
Sunderbans – Bengal Tiger
Periyar – Elephant

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order ?

S < DE < PE < SE
SE < S < PE < DE
SE < PE < S < DE
PE < S < SE < DE

Which one of the following ecosystem types has the highest annual net primary productivity ?

Temperate deciduous forest
Tropical rain forest
Tropical deciduous forest
Temperate evergreen forest

Which one of the following is being utilized as a source of biodiesel in the Indian country side ?

Pongamia
Euphorbia
Beetroot
Sugarcane

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

CO
\(SO_{2}\)
NOx
SPM

Which one of the following is not a bioindicator of water pollution ?

Sewage fungus
Sludge-worms
Blood-worms
Stone flies

A high density of elephant population in an area can result in :-

Predation on one another
Mutualism
Intra specific competition
Inter specific competition

Geometric representation of age structure is a characteristic of :-

Ecosystem
Biotic community
Population
Landscape

Which one of the following pairs of organisms are exotic species introduced in India ?

Nile perch, Ficus religiosa
Ficus religiosa, Lantana camara
Lantana camara, Water hyacinth
Water hyacinth, Prosopis cinereria

One of endangered species of Indian medicinal plants is that of:-

Nepenthes
Podophyllum
Ocimum
Garlic

A genetically engineered micro-organism used successfully in bioremediation of oil spills is a species of-

Bacillus
Pseudomonas
Trichoderma
Xanthomonas

A sequential expression of a set of human genes occurs when a steroid molecule binds to the:-

Ribosome
Transfer RNA
Messenger RNA
DNA sequence

The Okazaki fragments in DNA chain growth:-

Polymerize in the 5′-to-3′ direction and explain 3′- to 5′ DNA replication
Result in transcription
Polymerize in the 3′-to-5′ direction and forms replication fork
Prove semi-conservative nature of DNA replication

In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are:

n = 21 and x = 7
n = 7 and x = 21
n = 21 and x = 21
n = 21 and x = 14

Molecular basis of organ differentiation depends on the modulation in transcription by-

Anticodon
RNA polymerase
Ribosome
Transcription factor

Telomere repetitive DNA sequences control the function of eukaryote chromosomes because they:

Prevent chromosome loss
Act as replicons
Are RNA transcription initiator
Help chromosome pairing

Inheritance of skin colour in humans is an example of:-

Codominance
Chromosomal aberration
Point mutation
Polygenic inheritance

A common test to find the genotype of a hybrid is by:-

Crossing of one F1 progeny with male parent
Crossing of one F2 progeny with male parent
Crossing of one F2 progeny with female parent
Studying the sexual behaviour of F1 progenies

During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is it’s DNA-binding sequence ?

TATA
TTAA
AATT
CACC

Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the F2 segregation will show:

Higher number of the parental types
Higher number of the recombinant types
Segregation in the expected 9 : 3 : 3 : 1 ratio
Segregation in 3 : 1 ratio

In maize, hybrid vigour is exploited by:-

Inducing mutations
Bombarding the seeds with DNA
Crossing of two inbred parental lines
Harvesting seeds from the most productive plants

Differentiation of organs and tissues in a developing organism, is associated with-

Deletion of genes
Developmental mutations
Differential expression of genes
Lethal mutations

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation ?

3 : 1
50 : 50
9 : 1
1 : 3

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated ?

Through elimination of repetitive DNA
Deletion of non-essential genes
Super-coiling in nucleosomes
DNase digestion

In cloning of cattle a fertilized egg is taken out of the mother’s womb and:-

From this upto eight identical twins can be produced
The egg is divided into 4 pairs of cells which are implanted into the womb of other cows
In the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cows.
In the eight cell stage the individual cells are separated under electrical field for further development in culture media

Which one of the following statements is correct ?

At present it is not possible to grow maize without chemical fertilizers
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
Cyanobacteria such as Anabaena and nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show ?

The population of its predators increases enormously
S-shaped or sigmoid growth of this insect
The food plants mature and die at the end of the rainy season
Its population growth curve is of J-type

The two polynucleotide chain in DNA are:-

Semiconservative
Parallel
Discontinuous
Antiparallel

A plant requires magnesium for:

Cell wall development
Holding cells together
Protein synthesis
Chlorophyll synthesis

Probiotics are-

Live microbial food supplement
Safe antibiotics
Cancer inducting microbes
New kind of food allergens

Bowman’s glands are located in the

Olfactory epithelium of our nose
Proximal end of uriniferous tubules
Anterior pituitary
Female reproductive system of cockroach

Increased asthmatic attacks in certain seasons are related to:

Low temperature
Hot and humid environment
Eating fruits preserved in tin containers
Inhalation of seasonal pollen

A human male produces sperms with the genotypes AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person ?

AABB
AaBb
AaBB
AABb

Which one of the following pairs is wrongly matched ?

Coliforms – Vinegar
Methanogens – Gobar gas
Yeast – Ethanol
Streptomycetes – Antibiotic

Which one of the following pairs is mismatched ?

Bombyx mori – Silk
Pila globosa – Pearl
Apis indica – Honey
Kenia lacca – Lac

Which one of the following is a viral disease of poultry ?

Pasteurellosis
Salmonellosis
Coryza
New Castle disease

Ultrasound of how much frequency is beamed into human body for sonography ?

45 – 70 MHz
30 – 45 MHz
15 – 30 MHz
1 – 15 MHz

Lysozyme that is present in perspiration, saliva and tears, destroys:

Most virus – infected cells
Certain fungi
Certain types of bacteria
All viruses

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