Official NEET UG 2006 Test

In producing chlorine through electrolysis 100 watt power at 125V is being consumed. How much chlorine per minute is liberated? E.C.E. of chlorine is $0.367 \times 10^{–6} kg/coulomb:-$

17.6 mg
21.3 mg
24.3 mg
13.6 mg

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will-

Flow from A to B
Flow in the direction which will be decided by the value of V
Be zero
Flow from B to A

A rectangular block of mass m and area of cross- section A floats in a liquid of density $\rho$. If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then:-

$T \propto \sqrt{\rho}$
$T \propto \frac{1}{\sqrt{A}}$
$T \propto \frac{1}{\rho}$
$T \propto \frac{1}{\sqrt{m}}$

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency:-

275 K
325 K
250 K
380 K

When a charged particle moving with velocity $\vec{V}$ is subjected to a magnetic field of induction $\vec{B}$, the force on it is non-zero. This implies the:-

Angle between $\vec{V}$ and $\vec{B}$ is necessary $90^\circ$
Angle between $\vec{V}$ and $\vec{B}$ can have at value other than $90^\circ$
Angle between $\vec{V}$ and $\vec{B}$ can have at value other than zero and $180^\circ$
Angle between $\vec{V}$ and $\vec{B}$ is either zero or $180^\circ$

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances $r_{1} and r_{2} (r_{1} > r_{2})$ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:-

$r_{1} – r_{2}$
$\frac{r_{1} + r_{2}}{2}$
$\frac{r_{1} – r_{2}}{2}$
$r_{1} + r_{2}$

A black body at $1227^\circ C$ emits radiations with maximum intensity at a wavelength of 5000 . The temperature of the body is increased by $1000^\circ C$, the maximum intensity will be observe at:-

$/$
$/$
$/$
$/$

Two circular coil 1 and 2 are made from the same wire but the radius of the $1^{st}$ coil is twice that of the $2^{nd}$ coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same-

3
4
6
2

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be:-

$\frac{f}{4}$
8f
$\frac{f}{2 \sqrt{2}}$
$\frac{f}{2}$

The binding energy of deuteron is 2.2 MeV and that of $^{4}_{2}He$ is 28MeV. If two deuterons are fused to form one $^{4}_{2}He$ then the energy released is:-

25.8 MeV
23.6 MeV
19.2 MeV
30.2 MeV

In a radioactive material the activity at time $t_{1} is R_{1}$ and at a later time $t_{2}$, it is $R_{2}$. If the decay constant of the material is $\lambda$, then

$R_{1}=R_{2}e^{- \lambda (t_{1}-t_{2})}$
$R_{1}=R_{2}e^{ \lambda (t_{1}-t_{2})}$
$R_{1}=R_{2}(t_{2}/t_{1})$
$R_{1}=R_{2}$

Ionization potential of hydrogen atom is 13.6eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr’s theory, the spectral lines emitted by hydrogen will be:-

Two
Three
Four
One

The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is:-

4U
8U
16U
$\frac{U}{4}$

For angles of projection of a projectile at angles $(45^\circ – \theta) and (45^\circ + \theta)$, the horizontal ranges described by the projectile are in the ratio of:

1 : 1
2 : 3
1 : 2
2 : 1

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation $s = \frac{1}{3}t^{2}$, where t is in seconds. Work done by the force in 2 seconds is:-

$\frac{5}{19}J$
$\frac{3}{8}J$
$\frac{8}{3}J$
$\frac{19}{5}J$

A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by $x = 40 + 12t – t^{3}$. How long would the particle travel before coming to rest: –

24 m
40 m
56 m
16 m

The velocity v of a particle at time t is given by $v = at +\frac{b}{t+c}$, where a, b and c are constants. The dimensions of a, b and c are respectively:-

$LT^{–2}, L and T$
$L^{2}, T and LT^{2}$
$LT^{2}, LT and L$
$L, LT and T^{2}$

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again:-

1 cm upward
4.5 cm downward
1 cm downward
2 cm upward

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10m. Taking $g = 10 m/s^{2}$, work done against friction is

200 J
100 J
Zero
1000 J

A transistor is operated in common emitter configuration at constant collector voltage $V_{c} = 1.5 V$ such that a change in the base current from $100 \mu A to 150 \mu A$ produces a change in the collector current from 5 mA to 10 mA. The current gain $(\beta)$ is:-

67
75
100
50

A forward biased diode is:-

A photo-cell employs photoelectric effect to convert:-

Change in the frequency of light into a change in electric voltage
Change in the intensity of illumination into a change in photoelectric current
Change in the intensity of illumination into a change in the work function of the photocathode
Change in the frequency of light into a change in the electric current

The core of a transformer is laminated because:-

Energy losses due to eddy currents may be minimised
The weight of the transformer may be reduced
Rusting of the core may be prevented
Ratio of voltage in primary and secondary may be increased

Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

10 mH
6mH
4 mH
16 mH

In a discharge tube ionization of enclosed gas produced due to collisions between:

Positive ions and neutral atoms/molecules
Negative electrons and netural atoms/molecules
Photons and neutral atoms/molecules
Neutral gas atoms/molecules

When photons of energy h? fall on an aluminium plate (of work function $E_{0}$), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be

$K+E_{0}$
2K
K
K + hv

The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B and C are as shown below-

The logic circuit gate is:

AND gate
NAND gate
NOR gate
OR gate

A coil of inductive reactance $31 \Omega$ has a resistance of $8 \Omega.$ It is placed in series with a condenser of capacity reactance $25\Omega.$ The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is:-

0.56
0.64
0.80
0.33

A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of $30^\circ$ with the wall. It is reflected with the same speed and at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is:-

48 N
24 N
12 N
96 N

The moment of inertia of a uniform circular disc of radius ‘R’ and mass ‘M’ about an axis touching the disc at its diameter and normal to the disc is:-

$MR^{2}$
$\frac{2}{5} MR^{2}$
$\frac{3}{2} MR^{2}$
$\frac{1}{2} MR^{2}$

The momentum of a photon of energy 1MeV in kg m/s, will be-

$0.33 \times 10^{6}$
$7 \times 10^{–24}$
$10^{–22}$
$5 \times 10^{–22}$

The radius of Germanium (Ge) nuclide is measured to be twice the radius of $^{9}_{4}Be$. The number of nucleons in Ge are:-

73
74
75
72

The molar specific heat at constant pressure of an ideal gas is $[\frac{7}{2}]R.$The ratio of specific heat at constant pressure to that at constant volume is:-

$\frac{7}{5}$
$\frac{8}{7}$
$\frac{5}{7}$
$\frac{9}{7}$

The Earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the Earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is:-

$\sqrt{2}$
$\frac{1}{\sqrt{2}}$
$\frac{1}{3}$
$\frac{1}{2}$

Two sound waves with wavelength 5.0 m and 5.5 m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second:-

12
0
1
6

Power dissipated across the $8 \Omega$ resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the $3 \Omega$ resistor is:-

2.0
1.0
0.5
3.0

Kirchhoff’s first and second laws for electrical circuits are consequences of:-

Conservation of energy
Conservation of electric charge and energy respectively
Conservation of electric charge
Conservation of energy and electric charge respectively

A transverse wave propagating along x-axis is represented by $y(x , t)= 8.0 sin (0.5 \pi x – 4 \pi t – \frac{\pi}{4})$ where x is in metres and t is in seconds. The speed of the wave is:-

$4 \pi m/s$
$0.5 \pi m/s$
$\frac{\pi}{4}m/s$
8 m/s

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A-

2
4
$\frac{1}{2}$
1

Which one of the following statements is true:

Both light and sound waves in air are transverse
The sound waves in air are longitudinal while the light waves are transverse
Both light and sound waves in air are longitudinal
Both light and sound waves can travel in vacuum

Above Curie temperature:-

A ferromagnetic substance becomes paramagnetic
A paramagnetic substance becomes diamagnetic
A diamagnetic substance becomes paramagnetic
A paramagnetic substance becomes ferromagnetic

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in dipoters of the combination is:-

25
50
Infinite
Zero

An electric dipole of moment $\vec{p}$ is lying along a uniform electric field $\vec{E}.$ The work done in rotating the dipole by $90^\circ$ is:-

$\sqrt{2}pE$
$\frac{pE}{2}$
2pE
p E

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:-

Decreases
Does not change
Becomes zero
Increases

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is:

0, 0
0, 10 m/s
10 m/s, 10 m/s
10 m/s, 0

A square surface of side L metres is in the plane of the paper. A uniform electric field $\vec{E} (volt/m)$, also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is:-

$EL^{2}/(2 \epsilon_{0})$
$EL^{2}/2$
Zero
$EL^{2}$

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity $\omega$. The force exerted by the liquid at the other ends is:-

$\frac{ML \omega^{2}}{2}$
$\frac{ML^{2} \omega }{2}$
$M L \omega^{2}$
$\frac{ML^{2} \omega^{2} }{2}$

A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is (Moment of inertia of rod about A is $\frac{m \ell^{2}}{3}$):

$\frac{3g}{2 \ell}$
$\frac{2 \ell}{3g}$
$\frac{3g}{2 \ell^{2}}$
$mg \frac{\ell}{2}$

The vectors $\vec{A}$ and $\vec{B}$ are such that$|\vec{A} + \vec{B}| = |\vec{A} – \vec{B}|$ The angle between the two vectors is:-

$90^\circ$
$60^\circ$
$75^\circ$
$45^\circ$

Two bodies, A(of mass 1kg) and B(of mass 3kg), are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is:-

$\frac{5}{4}$
$\frac{12}{5}$
$\frac{5}{12}$
$\frac{4}{5}$

Identify the correct statement for change of Gibbs energy for a system $(\Delta G_{system})$ at constant temperature and pressure:-

If $\Delta G_{system} > 0$, the process is spontaneous
If $\Delta G_{system} = 0$, the system has attained
equilibrium
If $\Delta G_{system} = 0$, the system is still moving in
a particular direction
If $\Delta G_{system} \lt 0$, the process is not spontaneous

A solution containing $10 g per dm^{3}$ of urea (molecular mass = $60 g mol^{–1}$) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is:

$250 g mol^{–1}$
$300 g mol^{–1}$
$350 g mol^{–1}$
$200 g mol^{–1}$

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to:

– log K
n
$\frac{1}{n}$
log K

Assume each reaction is carried out in an open container. For which reaction will $\Delta H = \Delta E ?$

$H_{2}(g) + Br_{2}(g) \rightarrow 2HBr(g)$
$C(s) + 2H_{2}O(g) \rightarrow 2H_{2}(g) + CO_{2}(g)$
$PCl_{5}(g) \rightarrow PCl_{3}(g) + Cl_{2}(g)$
$2CO(g) + O_{2}(g) \rightarrow 2CO_{2}(g)$

In a set off reactions propionic acid yielded a compound D.

The structure of D would be:-

$CH_{3}CH_{2}CH_{2}NH_{2}$
$CH_{3}CH_{2}CONH_{2}$
$CH_{2}CH_{2}NHCH_{3}$
$CH_{3}CH_{2}NH_{2}$

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process:

are respectively-

Amylase and Maltase
Diastase and Lipase
Pepsin and Trypsin
Invertase and Zymase

The human body does not produce:-

DNA
Vitamin
Hormones
Enzymes

CsBr crystallizes in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being $6.02 \times 10^{23} mol^{–1}$, the density of CsBr is:-

$42.5 g/cm^{3}$
$0.425 g/cm^{3}$
$8.25 g/cm^{3}$
$4.25 g/cm^{3}$

More number of oxidation states are exhibited by the actinoids than by the lanthonoids. The main reason for this is:-

More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
Lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals
Greater metallic character of the lanthanoids than that of the corresponding actinoids
More active nature of the actinoids

Given: The mass of electron is $9.11 \times 10^{–31}Kg$ Planck constant is $6.626 \times 10^{–34}Js$, the uncertainty involved in the measurement of velocity within a distance of 0.1 is:-

$5.79 \times 10^{6}ms^{–1}$
$5.79 \times 10^{7}ms^{–1}$
$5.79 \times 10^{8}ms^{–1}$
$5.79 \times 10^{5}ms^{–1}$

Copper sulphate dissolved in excess of KCN to give:-

CuCN
$[Cu(CN)_{4}]^{3-}$
$[Cu(CN)_{4}]^{2-}$
$Cu(CN)_{2}$

In which of the following pairs are both the ions coloured in aqueous solution-[At. No. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27]

$Ni^{2+}, Ti^{3+}$
$Sc^{3+}, Ti^{3+}$
$Sc^{3+}, Co^{2+}$
$Ni^{2+}, Cu^{+}$

$Al_{2}O_{3}$ can be converted to anhydrous $AlCl_{3}$ by heating:-

$Al_{2}O_{3}$ with HCl gas
$Al_{2}O_{3}$ with NaCl in solid state
A mixture of $Al_{2}O_{3}$ and carbon in dry $Cl_{2}$ gas
$Al_{2}O_{3}$ with $Cl_{2}$ gas

The enthalpy and entropy change for the reaction: $Br_{2}(l) + Cl_{2}(g) \rightarrow 2BrCl(g)$are $30 kJ mol^{–1}$ and $105 JK^{–1} mol^{–1}$ respectively. The temperature at which the reaction will be in equilibrium is:-

285.7K
273 K
450 K
300 K

The appearance of colour in solid alkali metal halides is generally due to :

F-centres
Schottky defect
Frenkel defect
Interstitial positions

The general molecular formula, which represents the homologus series of alkanols is:-

$C_{n}H_{2n}O_{2}$
$C_{n}H_{2n}O$
$C_{n}H_{2n+1}O$
$C_{n}H_{2n+2}O$

If $E^{0}_{Fe^{2+}/Fe} = – 0.441 V$ and $E^{0}_{Fe^{3+}/Fe^{2+}} = 0.771 V$, the standard EMF of the reaction : $Fe + 2Fe^{3+} \rightarrow 3Fe^{2+}$ will be:

0.330 V
1.653 V
1.212 V
0.111 V

For the reaction : $2A + B \rightarrow 3C + D$ Which of the following does not express the reaction rate:-

$- \frac{d[C]}{3dt}$
$- \frac{d[B]}{dt}$
$\frac{d[D]}{dt}$
$- \frac{d[A]}{2dt}$

For the reaction :

$CH_{4}(g) + 2O_{2}(g) \rightleftharpoons CO_{2}(g) + 2H_{2}O(\ell)$
$\Delta H_{r} = – 170.8 kJ mol^{–1}$
Which of the following statements is not true:-

At equilibrium, the concentrations of $CO_{2}(g)$ and $H_{2}O(\ell)$ are not equal
The equilibrium constant for the reaction is given by $K_{P} = \frac{[CO_{2}]}{[CH_{4}][O_{2}]}$
Addition of $CH_{4}(g) or O_{2}(g)$ at equilibrium will cause a shift to the right
The reaction is exothermic

$[NH(CH_{2})NHCO(CH_{2})_{4}CO]_{n}$ is a:-

copolymer
Addition polymer
Thermosetting polymer
Homopolymer

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $\alpha$ – hydroxy acid. The carbonyl compound is:

Acetaldehyde
Acetone
diethyl ketone
Formaldehyde

Which one of the following is a peptide hormone:-

Glucagon
Testosterone
Thyroxin
Adrenaline

The major organic product in the reaction, $CH_{3}–O–CH(CH_{3})_{2} + HI \rightarrow$ Product is:

$CH_{3}OH + (CH_{3})_{2}CHI$
$ICH_{2}OCH(CH_{3})_{2}$
$CH_{3}I + (CH_{3})_{2}CHOH$

Nucleophilic addition reaction will be most favoured in:-

$(CH_{3})_{2}C = O$
$CH_{3}CH_{2}CHO$
$CH_{3}CHO$

The enthalpy of hydrogenation of cyclohexene is $–119.5 kJ mol^{–1}$. If resonance energy of benzene is $–150.4 kJ mol^{–1}$, its enthalpy of hydrogenation would be:-

$–508.9 kJ mol^{–1}$
$–208.1 kJ mol^{–1}$
$–269.9 kJ mol^{–1}$
$–358.5 kJ mol^{–1}$

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields:-

Ethyl butyrate
Acetoacetic ester
Methyl acetoacetate
Ethyl propionate

Consider the reaction

$N_{2}(g) + 3H_{2}(g) \rightarrow 2NH_{3}(g)$

The equality relationship between $\frac{d[NH_{3}]}{dt}$ and $- \frac{d[H_{2}]}{dt}$ is :-

$\frac{d[NH_{3}]}{dt} = – \frac{1}{3} \frac{d[H_{2}]}{dt}$
$+ \frac{d[NH_{3}]}{dt} = – \frac{2}{3} \frac{d[H_{2}]}{dt}$
$+ \frac{d[NH_{3}]}{dt} = – \frac{3}{2} \frac{d[H_{2}]}{dt}$
$\frac{d[NH_{3}]}{dt} = – \frac{d[H_{2}]}{dt}$

Which of the following is not chiral:-

2-Butanol
2,3-Dibromopentane
3-Bromopentane
2-Hydroxypropanoic acid

$[Co(NH_{3})_{4}(NO_{2})_{2}]Cl$ exhibits:-

Linkage isomerism, ionization isomerism and optical isomerism
Linkage isomerism, ionization isomerism and geometrical isomerism
Ionization isomerism, geometrical isomerism and optical isomerism
Linkage isomerism, geometrical isomerism and optical isomerism

$[Cr(H_{2}O)_{6}]Cl_{3}$ (at. No. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the Chromium of the complex is:-

$(3d x^{2} – y^{2})^{1} , 3d z^{2^{1}} , 3d xz^{1}$
$3d xy^{1} , (3d x^{2} – y^{2})^{1} , 3d yz^{1}$
$3d xy^{1} , 3d yz^{1} , 3d xz^{1}$
$3d xy^{1} , 3d yz^{1} , 3dz^{2^{1}}$

1.00 g of a non-electrolyte solute (molar mass $250g mol^{–1}$) was dissolved in 51.2 g of benzene. If the freezing point depression constant $K_{f}$ of benzene is $5.12 K kg mol^{–1}$, the freezing point of benzene will be lowered by:-

0.4 K
0.3 K
0.5 K
0.2 K

Which of the following pairs constitutes a buffer:-

$HNO_{2} \& NaNO_{2}$
$NaOH \& NaCl$
$HNO_{3} \& NH_{4}NO_{3}$
$HCl \& KCl$

The hydrogen ion concentration of a $10^{–8}$M HCl aqueous solution at 298 K ($KW = 10^{–14}$) is:-

$1.0 \times 10^{–6} M$
$1.0525 \times 10^{–7} M$
$9.525 \times 10^{–8} M$
$1.0 \times 10^{–8} M$

A solution of acetone is ethanol:-

Shows a negative deviation from Raoult's law
Shows a positive deviation from Raoult's law
Behaves like a near ideal solution
Obeys Raoult's law

A hypothetical electrochemical cell is shown below:

The emf measured is +0.20V. The cell reaction is:

$A^{+}+ B \rightarrow A + B^{+}$
$A^{+}+ e^{–} \rightarrow A; B^{+}+ e^{–} \rightarrow B$
The cell reaction cannot be predicted
$A + B^{+} \rightarrow A^{+}+ B$

Ethylene oxide when treated with Grignard reagent yields:-

Secondary alcohol
Tertiary alcohol
Cyclopropyl alcohol
Primary alcohol

During osmosis, flow of water through a semipermeable membrane is:-

From solution having higher concentration only
Form both sides of semipermeable membrane with equal flow rates
From both sides of semipermeable membrane with unequal flow rates
From solution having lower concentration only

Which of the following is more basic than aniline:-

Diphenlamine
Triphenylamine
p-Nitroaniline
Benzylamine

In which of the following molecules all the bonds are not equal:-

$CIF_{3}$
$BF_{3}$
$AIF_{3}$
$NF_{3}$

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of $NH_{3}(1.5 D)$ is larger than that of $NF_{3} (0.2 D)$. This is because:-

In $NH_{3}$ as well as in $NF_{3}$ the atomic dipole and bond dipole are in the same direction
In $NH_{3}$ the atomic dipole and bond dipole are in the same direction whereas in $NF_{3}$ these are in opposite directions
In $NH_{3}$ as well as $NF_{3}$ the atomic dipole and bond dipole are in opposite directions
In $NH_{3}$ the atomic dipole and bond dipole are in the opposite directions whereas in $NF_{3}$ these are in the same direction

The correct order of the mobility of the alkali metal ions in aqueous solution is:

$Li^{+} > Na^{+} > K^{+} > Rb^{+}$
$Na^{+} > K^{+} > Rb^{+} > Li^{+}$
$K^{+} > Rb^{+} > Na^{+} > Li^{+}$
$Rb^{+} > K^{+} > Na^{+} > Li^{+}$

The correct order regarding the electronegativity of hybrid orbitals of carbon is:-

$sp > sp^{2} \lt sp^{3}$
$sp > sp^{2} > sp^{3}$
$sp \lt sp^{2} > sp^{3}$
$sp \lt sp^{2} \lt sp^{3}$

Which of the following species has a linear shape:-

$NO^{-}_{2}$
$SO_{2}$
$NO^{+}_{2}$
$O_{3}$

Which of the following is the most basic oxide:-

$Al_{2}O_{3}$
$Sb_{2}O_{3}$
$Bi_{2}O_{3}$
$SeO_{2}$

The orientation of an atomic orbital is governed by:-

Azimuthal quantum number
Spin quantum number
Magnetic quantum number
Principal quantum number

Which of the following is not a correct statement:-

The electron-deficient molecules can act as Lewis acids
The canonical structures have no real existence
Every $AB_{5}$ molecule does infact have square pyramid structure
Multiple bonds are always shorter than corresponding single bonds

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is:-

2
3
4
1

Which one of the following orders is not in according with the property stated against it ?

$F_{2} > Cl_{2} > Br_{2} > I_{2}$ ; Oxidising power
HI > HBr > HCl > HF ; Acidic property in water
$F_{2} > Cl_{2} > Br_{2} > I_{2}$ ; Electronegativity
$F_{2} > Cl_{2} > Br_{2} > I_{2}$ ; Bond dissociation energy

Which of the following is not isostructural with $SiCl_{4}$:-

$SCl_{4}$
$SO^{2-}_{4}$
$PO^{3-}_{4}$
$NH^{+}_{4}$

3,4-dimethylpentanoyl chloride
1-chloro-1-oxo-2,3-dimethylpentane
2-ethyl-3-methylbutanoyl chloride
2,3-dimethylpentanoyl chloride

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids ?

16
24
32
8

Pineapple (ananas) fruit develops from-

a unilocular polycarpellary flower
a multipistillate syncarpous flower
a cluster of compactly borne flowers on a common axis
a multilocular monocarpellary flower

Golden rice is a promising transgenic crop. When released for cultivation, it will help in

Alleviation of vitamin A deficiency
Pest resistance
Herbicide tolerance
Producing a petrol-like fuel from rice

Parthenocarpic tomato fruits can be produced by-

Removing androecium of flowers before pollen grains are released
Treating the plants with low concentrations of gibberellic acid and auxins
Raising the plants from vernalized seeds
Treating the plants with phenylmercuric acetate

How does pruning help in making the hedge dense ?

It induces the differentiation of new shoots from the rootstock
It frees axillary buds from apical dominance
The apical shoot grows faster after pruning
It released wound hormones

The ‘blue baby’ syndrome results from-

Excess of chloride
Methemoglobin
Excess of dissolved oxygen
Excess of TDS (total dissolved solids)

Praying mantis is a good example of-

Mullerian mimicry
Warning colouration
Social insects
Camouflage

Which one of the following statements is correct ?

Neurons regulate endocrine activity, but not vice verse
Endocrine glands regulate neural activity, and nervous system regulates endocrine glands
Neither hormones control neural activity nor the neurons control endocrine activity
Endocrine glands regulate neural activity, but not vice versa

Examination of blood of a person suspected of having anemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms ?

Thiamine
Folic acid and cobalamine
Riboflavin
Iron compounds

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield ?

Frequent irrigation of the crop
Treatment of the plants with cytokinins alongwith a small dose of nitrogenous fertilizer
Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5 trichlorophenoxy acetic acid
Application of iron and magnesium to promote synthesis of chlorophyll

In which of the following fruits is the edible part the aril ?

Custard apple
Pomegranate
Orange
Litchi

Which one of the following amino-acids was not found to be synthesized in Miller’s experiment ?

Glycine
Aspartic acid
Glutamic acid
Alanine

Crop plants grown in monoculture are-

Low in yield
Free from intraspecific competition
Characterised by poor root system
Highly prone to pests

Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year-

1986
1987
1988
1985

The formula for exponential population growth is-

dt/dN = rN
dN/rN = dt
rN/dN = dt
dN/dt = rN

Which one of the following is not used for construction of ecological pyramids ?

Dry weight
Number of individuals
Rate of energy flow
Fresh weight

Niche overlap indicates-

Active cooperation between two species
Two different parasites on the same host
Sharing of one or more resources between the two species
Mutualism between two species

In photosystem-I, the first electron acceptor is-

Ferredoxin
Cytochrome
Plastocyanin
An iron sulphur protein

Treatment of seed at low temperature under moist conditions to break its dormancy is called –

Sclarification
Vernalization
Chelation
Stratification

Which one of the following is the most suitable medium for culture of Drosophila melanogaster ?

Moist bread
Agar-agar
Ripe banana
cow dung

Which one of the following is not included under in-situ conservation ?

Sanctuary
Botanical garden
Biosphere reserve
National park

Which antibiotic inhibits interaction between tRNA and mRNA during bacterial protein synthesis ?

Erythromycin
Neomycin
Streptomycin
Tetracycline

Phenotype of an organism is the result of-

Mutations and linkages
Cytoplasmic effects and nutrition
Environmental changes and sexual dimorphism
Genotype and environment interactions

Photochemical smog pollution does not contain-

Ozone
Nitrogen dioxide
Carbon dioxide
PAN (peroxy acyl nitrate)

Moss peat is used as a packing material for sending flowers and live plants to distant places because-

It is easily available
It is hygroscopic
It reduces transpiration
It serves as a disinfectant

A common structural feature of vessel elements and sieve tube elements is-

Thick secondary walls
Pores on lateral wall
Presence of p-protein
Enucleate condition

The thalloid body of a slime mould (Myxomycetes) is known as-

Protonema
Plasmodium
Fruiting body
Mycelium

In which mode of inheritance do you expect more maternal influence among the offspring ?

Autosomal
Cytoplasmic
Y-linked
X-linked

What type of placentation is seen in sweet pea ?

Basal
Axile
Free central
Marginal

Long filamentous threads protruding at the end of a young cob of maize are-

Anthers
Styles
Ovaries
Hairs

Conifers differ from grasses in the-

Production of seeds from ovules
Lack of xylem tracheids
Absence of pollen tubes
Formation of endosperm before fertilization

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

Three
Four
Nine
Two

In Maize, hybrid vigour is exploited by-

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

Which of the following statements regarding mitochondrial membrane is not correct ?

The outer membrane is permeable to all kinds of molecules
The enzymes of the electron transfer chain are embedded in the outer membrane
The inner membrane is highly convoluted forming a series of infoldings
The outer membrane resembles a sieve

Amino acid sequence, in protein synthesis is decided by the sequence of-

tRNA
mRNA
cDNA
rRNA

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to $CO_{2}$ and$H_{2}O$ yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal ?

Two
Thirty
Fifty-seven
One

An organic substance bound to an enzyme and essential for its activity is called –

Coenzyme
Holoenzyme
Apoenzyme
isoenzyme

Bowman’s glands are found in-

Olfactory epithelium
External auditory canal
Cortical nephrons only
Juxtamedullary nephrons

The bacterium (Clostridium botulinum) that causes botulism is-

A facultative anaerobe
An obligate anaerobe
A facultative aerobe
An obligate aerobe

Which one of the following is the correctly matched pair of an endangered animal and a National Park ?

Lion – Corbett National Park
Rhinoceros – Kaziranga National Park
Wild Ass – Dudhwa National Park
Great Indian Bustard– Keoladeo National Park

A person showing unpredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from-

Schizophrenia
Borderline Personality Disorder (BPD)
Mood disorders
Addictive disorders

Sulphur is an important nutrient for optimum growth and productivity in-

Pulse crops
Cereals
Fibre crops
Oilseed crops

Pentamerous, actinomorphic flowers, bicarpellary ovary with oblique septa, and fruit a capsule or berry, are characteristic features of-

Asteraceae
Brassicaceae
Solanaceae
Liliaceae

In a moss the sporophyte-

is partially parasitic on the gametophyte
produces gametes that given rise to the gametophyte
Arises from a spore produced from the gametophyte
Manufactures food for itself, as well as for the gametophyte

Curing of tea leaves is brought about by the activity of-

Bacteria
Mycorrhiza
Viruses
Fungi

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude-

People get pollution-free air to breathe and more oxygen is available
Atmospheric $O_{2}$ level is less and hence more RBCs are needed to absorb the required amount of $O_{2}$ to survive
There is more UV radiation which enhances RBC production
People eat more nutritive food, therefore more RBCs are formed

An important evidence in favour of organic evolution is the occurrence of-

Homologous and vestigial organs
Analogous and vestigial organs
Homologous organs only
Homologous and analogous organs

Which one of the following is not a living fossil-

King crab
Sphenodon
Archaeopteryx
Peripatus

A major breakthrough in the studies of cells came with the development of electron microscope. This is because-

The resolution power of the electron microscope is much higher than that of the light microscope
The resolving power of the electron microscope is 200-350 nm as compared to 0.1-0.2 nm for the light microscope
Electron beam can pass through thick materials, whereas light microscopy requires thin sections
The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons

Which one of the following is a matching set of phylum and its three examples ?

Cnidaria – Bonellia, Physalia, Aurelia
Platyhelminthes-Planaria, Schistosoma, Enterobius
Mollusca-Loligo, Teredo, Octopus
Porifera-Spongilla, Euplectella, Pennatula

Metameric segmentation is the characteristic of-

Platyhelminthes and Arthropoda
Echinodermata and Annelida
Annelida and Arthropoda
Mollusca and Chordata

Which of the following pairs of an animal and a plant represents endangered organisms in India-

Bentinckia nicobarica and Red Panda
Tamarind and Rhesus monkey
Cinchona and Leopard
Banyan and Black buck

Jurassic period of the Mesozoic era characterized by-

Gymnosperms are dominant plants and first birds appear
Radiation of reptiles and origin of mammal like reptiles
Dinosaurs become extinct and angiosperms appear
Flowering plants and first dinosaurs appear

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia-

These are all unicellular protists
They have flagella
They produce spores
These are all parasites

Which of the following statements regarding cilia is not correct –

The organized beating of cilia is controlled by fluxes of $Ca^{2+}$ across the membrane
Cilia are hair-like cellular appendages
Microtubules of cilia are composed of tubulin
Cilin contain an outer ring of nine doublet microtubules surrounding two single microtubules

Two microbes found to be very useful in genetic engineering are-

Escherichia coli and Agrobacterium tumefaciens
Vibrio cholerae and a tailed bacteriophage
Diplococcus sp.and Pseudomonas sp.
Crown gall bacterium and Caenorhabditis elegans

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread ?

A. Temperature of about $25^{o}C$
B. Temperature of about $5^{o}C$
C. Relative humidity of about5%
D. Relative humidity of about 95%
E. A shady place
F. A brightly illuminated place
Choose the answer from the following options

A, C and E only
A, D and E only
B, D and E only
B, C and F only

Evolutionary history of an organism is known as-

Phylogeny
Ancestry
Paleontology
Ontogeny

Which of the following is considered a hot-spot of biodiversity in India ?

Western Ghats
Indo-Gangetic Plain
Eastern Ghats
Aravalli Hills

During photorespiration the oxygen consuming reaction (s) occur in-

Stroma of chloroplasts and mitochondria
Stroma of chloroplasts and peroxisomes
Grana of chloroplasts and peroxisomes
Stroma of chloroplasts

Which one of the following is an example of polygenic inheritance ?

Flower colour in Mirabilis jalapa
Production of male honey bee
Pod shape in garden pea
Skin colour in humans

Which one of the following does not act as a neurotransmitter ?

Acetylcholine
Epinephrine
Norepinephrine
Cortisone

Sertoli cells are regulated by the pituitary hormone known as-

FSH
GH
Prolactin
LH

A steroid hormone which regulates glucose metabolism is-

Cortisol
Corticosterone
11-deoxycorticosterone
Cortisone

The contractile protein of skeletal muscle involving ATPase activity is-

Tropomyosin
Myosin
$\alpha$ -Actin
Troponin

Which one of the following is not a second messenger in hormone action ?

cGMP
Calcium
Sodium
cAMP

In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the $F_{2}$ generation of the cross $RRYY \times rryy$?

Only round seeds with green cotyledons
Only wrinkled seeds with yellow cotyledons
Only wrinkled seeds with green cotyledons
Round seeds with yellow cotyledons, and wrinkled seeds with yellow cotyledons

One gene-one enzyme hypothesis was postulated by-

R. Franklin
Hershey and Chase
A.Garrod
Beadle and Tatum

One turn of the helix in a B-form DNA is approximately-

20 nm
0.34 nm
3.4 nm
2 nm

Test cross involves-

Crossing between two genotypes with recessive trait
Crossing between two $F_{1}$ hybrids
Crossing the $F_{1}$ hybrid with a double
recessive genotype
Crossing between two genotypes with dominant trait

Antiparallel strands of a DNA molecule means that-

One strand turns anti-clockwise
The phosphate groups of two DNA stands, at their ends, share the same position
The phosphate groups at the start of two DNA strands are in opposite position (pole)
One strand turns clockwise

Areolar connective tissue joins-

Fat body with muscles
Integument with muscles
Bones with muscles
Bones with bones

Mast cells secrete-

Hippurin
Myoglobin
Histamine
Heamoglobin

If a colourblind woman marries a normal visioned man, their sons will be –

All normal visioned
One-half colourblind and one-half normal
Three-fourths colourblind and one-fourth normal
All colourblind

Cri-du-chat syndrome in humans is caused by the-

Fertilization of an XX egg by a normal Y-bearing sperm
Loss of half of the short arm of chromosome 5
Loss of half of the long arm of chromosome 5
Trisomy of $21^{st}$ chromosome

Restriction endonuclease –

Cuts the DNA molecule randomly
Cuts the DNA molecule at specific sites
Restricts the synthesis of DNA inside the nucleus
Synthesizes DNA

Antibodies in our body are complex-

Lipoproteins
Steroids
Prostaglandins
Glycoproteins

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is –

< 3.0 ppm
<10 ppm
< 100 ppm
< 30 ppm

Earthworms are –

Ureotelic when plenty of water is available
Uricotelic when plenty of water is available
Uricotelic under conditions of water scarcity
Ammonotelic when plenty of water is available.

Which of the following is an accumulation and release centre of neurohormones ?

Posterior pituitary lobe
Intermediate lobe of the pituitary
Hypothalamus
Anterior pituitary lobe

Withdrawal of which of the following hormones is the immediate cause of menstruation ?

Estrogen
FSH
FSH-RH
Progesterone

Which one of the following statements is incorrect ?

The residual air in lungs slightly decreases the efficiency of respiration in mammals
The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
In insects, circulating body fluids serve to distribute oxygen to tissues
The principle of countercurrent flow facilitates efficient respiration in gills of fishes

Which one of the following has an open circulatory system ?

Pheretima
Periplaneta
Hirudinaria
Octopus

Which hormone causes dilation of blood vessels, increased oxygen consumption an glucogenesis ?

ACTH
Insulin
Adrenalin
Glucagon

The causative agent of mad-cow disease is a-

Bacterium
Prion
Worm
Virus

The translocation of organic solutes in sieve tube members is supported by-

Root pressure and transpiration pull
P-proteins
Mass flow involving a carrier and ATP
Cytoplasmic streaming

Biradial symmetry and lack of cnidoblasts are the characteristics of-

Starfish and sea anemone
Ctenoplana and Beroe
Aurelia and Paramecium
Hydra and starfish

The arrangement of the nuclei in a normal embryo sac in the dicot plants is-

2 + 4 + 2
3 + 2 + 3
2 + 3 + 3
3 + 3 + 2

An enzyme that can stimulate germination of barley seeds is-

$\alpha$- amylase
Lipase
Protease
Invertase

In a cereal grain the single cotyledon of embryo is represented by –

Coleorhiza
Scutellum
Prophyll
Coleoptile

The majority of carbon dioxide produced by our body cells is transported to the lungs-

Dissolved in the blood
As bicarbonates
As carbonates
Attached to hemoglobin

Triticale, the first man-made cereal crop, has been obtained by crossing wheat with

Rye
Pearl millet
Sugarcane
Barley

In order to obtain virus-free plants through tissue culture the best method is-

Protoplast culture
Embryo rescue
Anther culture
Meristem culture

HIV that causes AIDS, first starts destroying

B-lymphocytes
Leucocytes
Thrombocytes
Helper T-lymphocytes

In which one of the following sets of animals do all the four give birth to young ones ?

Lion, Bat, Whale, Ostrich
Platypus, Penguin, Bat, Hippopotamus
Shrew, Bat, Cat, Kiwi
Kangaroo, Hedgehog, Dolphin, Loris

Sickle cell anemia has not been eliminated from the African population because-

It is controlled by recessive genes
It is not a fatal disease
It provides immunity against malaria
It is controlled by dominant genes

Two common characters found in centipede, cockroach, and crab are-

Compound eyes and anal cerci
Jointed legs and chitinous exoskeleton
Green gland and tracheae
Book lungs and antennae

Both sickle cell anemia and Huntington’s chorea are-

Bacteria-related diseases
Congenital disorders
Pollutant-induced disorders
Virus-related diseases

Angiotensinogen is a protein produced and secreted by-

Macula densa cells
Endothelial cells (cells lining the blood vessels)
Liver cells
Juxtaglomerular (JG) cells

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