Official NEET UG 2013

In Young’s double slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths $\lambda _1$= 12000$Å$ and $\lambda _2$ = 10000$Å$. At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?

3 mm
8 mm
6 mm
4 mm

In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be :

$\frac{5}{4}G$
$\frac{2}{3}G$
1.5 G
$\frac{1}{3}G$

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is : (given 1u = 931 MeV)

13.35 MeV
2.67 MeV
26.7 MeV
6.675 MeV

In the given (V – T) diagram, what is the relation between pressure P$_1$ and P $_2$ ?

Cannot be predicted
P$_2$ = P$_1$
P$_2$ > P$_1$
$P_2$ < $P_1$

The output (X) of the logic circuit shown in figure will be :

X = A+B

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

6 mg
zero
2 mg
3 mg

In a n-type semiconductor, which of the following statement is true:

Holes are majority carriers and trivalent atoms are dopants.
Electrons are majority carriers and trivalent atoms are dopants.
Electron are minority carriers and pantavalent atoms are dopants
Holes are minority carriers and pentavalent atoms are dopants.

The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be:

100 years
40 years
60 years
80 years

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C$_P$ and C$_V$, respectively. If $ \gamma = \frac{C_P}{C_V}$ and R is the universal gas constant, then C$_V$ is equal to :

$\gamma R$
$\frac{1+ \gamma}{1 – \gamma}$
$\frac{R}{(\gamma -1)}$
$\frac{(\gamma – 1)}{R}$

The wavelength $ \lambda _e$ of an electron and $\lambda _P$ of a photon of same energy E are related by:

$ \lambda _P \propto \frac{1}{\sqrt{\lambda _e}}$
$\lambda _P$ $\propto $ $\lambda _e$$ ^2$
$\lambda _P$$\propto $ $\lambda _e$
$\lambda _P$$\propto $ $\sqrt{\lambda _e}$

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is:-

$\frac{9}{31}$
$\frac{5}{27}$
$\frac{3}{23}$
$\frac{7}{29}$

A current loop in a magnetic field :-

Can be in equilibrium in two orientations, one stable while the other is unstable.
Experiences a torque whether the field is uniform or non uniform in all orientations
Can be in equilibrium in one orientation
Can be in equilibrium in two orientations, both the euilibrium states are unstable

A, B and C are three points in a uniform electric field. The electric potential is :-

Same at all the three points A,B and C
Maximum at A
Maximum at B
Maximum at C

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is :-

$\frac{2g}{3L}$
$\frac{3g}{2L}$
g/L
2g/L

A wire of resistance 4$\Omega $is stretched to twice its original length. The resistance of stretched wire would be :-

16 $\Omega $
2$\Omega $
4$\Omega $
8$\Omega $

The velocity of a projectile at the initial point A is $(2 \hat{2} + 3\hat{j})$ m/s. It’s velocity (in m/s) at point B is :-

$2\hat{i} + 3\hat{j}$
$-2\hat{i} – 2\hat{j}$
$-2\hat{i} + 2\hat{j}$
$2\hat{i} – 2\hat{j}$

A body of mass ‘m’ is taken from the earth’s surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be :-

$\frac{1}{3}$ mgR
mg2R
$\frac{2}{3}$ mgR
3 mgR

A stone falls freely under gravity. It covers distances h$_1$, h$_2$ and h$_3$ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between h$_1$, h$_2$ and h$_3$ is :-

h$_1$ = h$_2$ = h$_3$
h$_1$ = 2h$_2$ = 3h$_3$
h$_1$ = $\frac{h_2}{3} = \frac{h_3}{5}$
h$_2$ = 3h$_1$ and h$_3$ = 3h$_2$

A bar magnet of length ‘$l $’ and magnetic dipole moment ‘M’ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

$\frac{M}{2}$
M
$\frac{3}{\pi} M $
$\frac{2}{\pi} M $

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10$\Omega $ is

1.0 $\Omega $
0.2 $\Omega $
0.5 $\Omega $
0.8 $\Omega $

For photoelectric emission from certain metal the cutoff frequency is v. If radiation of frequency 2? impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) :-

$2 \sqrt{hv/m}$
$ \sqrt{hv/(2m)}$
$ \sqrt{hv/m}$
$ \sqrt{2hv/m}$

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $\frac{C_P}{C_V}$ for the gas is :-

$\frac{3}{2}$
$\frac{4}{3}$
2
$\frac{5}{3}$

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

length = 300cm, diameter = 3mm
length = 50 cm, diameter = 0.5 mm
length = 100 cm, diameter = 1mm
length = 200 cm, diameter = 2mm

The resistances of the four arms P,Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be :-

2.0 A
1.0 A
0.2 A
0.1 A

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T$_1$ K to T$_2$ K is :-

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using :-

Newton's Law of cooling
Stefan's Law
Wien's displacement Law
Kirchoff's Law

–2000 J
2000 J
1000 J
Zero

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is :-

Infra-red waves produce heating in a microwave oven
The frequency of the microwaves must match the resonant frequency of the water molecules
The frequency of the microwaves has no relation with natural frequency of water molecules
Microwaves are heat waves, so always produce heating

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms$^{–1}$ and the second part of mass 2 kg moves with 8 ms$^{–1}$ speed. If the third part files off with 4 ms$^{–1}$ speed, then its mass is :-

17 kg
3 kg
5 kg
7 kg

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows $ P = \frac{a^3 b^2}{cd}$ % error in P is :-

4%
14%
10%
7%

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of :

Analogous organs that have evolved due to divergent evolution
Homologous organs that have evolved due to convergent evolution
Homologous organs that have evolved due to divergent evolution
Analogous organs that have evolved due to convergent evolution

Select the correct statement with respect to locomotion in humans:

The joint between adjacent vertebrae is a fibrous joint
A decreased level of progesterone causes osteoporosis in old people
Accumulation of uric acid crystals in joints causes their inflammation
The vertebral column has 10 thoracic vertebrae

A phosphoglyceride is always made up of :

a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
only a unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

Perisperm differs from endosperm in:

its formation by fusion of secondary nucleus with several sperms
being a haploid tissue
having no reserve food
being a diploid tissue

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

Amensalism
Ectoparasitism
Symboisis
Commensalism

The cell-mediated immunity inside the human body is carried out by :

Erythrocytes
T-lymphocytes
B-lymphocytes
Thrombocytes

Which of the following are likely to be present in deep sea water ?

Saprophytic fungi
Archaebacteria
Eubacteria
Blue-green algae

One of the representatives of Phylum Arthropoda is :

flying fish
cuttlefish
silverfish
pufferfish

Megasporangium is equivalent to :

Ovule
Embryo sac
Fruit
Nucellus

Kyoto Protocol was endorsed at :

CoP – 4
CoP – 3
CoP – 5
CoP – 6

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/ or functions.

D-Cortex – outer part of kidney and do not contain any part of nephrons
A-Adrenal gland – located at the anterior part of kidney. Secrete Catecholamines which stimulate glycogen breakdown
B-Pelvis – broad funnel shaped space inner to hilum, directly connected to loops of Henle
C-Medulla-inner zone of kidney and contains complete nephrons

In china rose the flowers are :

Zygomorphic, epigynous with twisted aestivation
Actinomorphic, hypogynous with twisted aestivation
Actinomorphic, epigynous with valvate aestivation
Zygomorphic, hypogynous with imbricate aestivation

The Golgi complex plays a major role :

in post translational modification of proteins and glycosidation of lipids
in trapping the light and transforming it into chemical energy
in digesting proteins and carbohydrates
as energy transferring organelles

What external changes are visible after the last moult of a cockroach nymph?

Labium develops
Mandibles become harder
Anal cerci develop
Both fore wings with hind wings develop

Isogamous condition with non-flagallated gametes is found in

Fucus
Chlamydomonas
Spirogyra
Volvox

Transition state structure of the substrate formed during an enzymatic reaction is

permanent and stable
transient but stable
permanent but unstable
transient and unstable

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom :

Corpus luteum – Testosterone – Stimulates spermatogenesis
Anterior pituitary – Oxytocin – Stimulates uterus contraction during child birth
Posterior pituitary- Growth Hormone (GH) – Oversecretion stimulates abnormal growth
Thyroid gland – Thyroxine – Lack of iodine in diet results in goitre

The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of :

Inactivation of glycosidase enzyme in recombinant bacteria
Non-recombinant bacteria containing beta- galactosidase
Insertional inactivation of alpha-galactosidase in non-recombinant bacteria
Insertional inactivation of alpha-galactosidase in recombinant bacteria

Monoecious plant of Chara shows occurrence of :

upper oogonium and lower antheridium on the same plant
antheridiophore and archegoniophore on the same plant
stamen and carpel on the same plant
upper antheridium and lower oogonium on the same plant

Advantage of cleistogamy is :-

Vivipary
Higher genetic variability
More vigorous offspring
No dependence on pollinators

The H-zone in the skeletal muscle fibre is due to :

extension of myosin filaments in the central portion of the A-band
the absence of myofibrils in the central portion of A-band
the central gap between myosin filaments in the A-band
the central gap between actin filaments extending through myosin filaments in the A- band

Artificial insemination means :

introduction of sperms of a healthy donor directly into the ovary
yransfer of sperms of a healthy donor to a test tube containing ova
transfer of sperms of husband to a test tube containing ova
artificial introduction of sperms of a healthy donor into the vagina

Which group of animals belong to the same phylum?

Sponge, Sea anemone, Starfish
Malarial parasite, Amoeba, Mosquito
Earthworm, Pinworm, Tapeworm
Prawn, Scorpion, Locusta

Seed coat is not thin, membranous in :

Gram
Maize
Coconut
Groundnut

If two persons with ‘AB’ blood group marry and have sufficiently large number of children, these children could be classified as ‘A’ blood group : ‘AB’ blood group ‘B’ blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both ‘A’ and ‘B’ type proteins in ‘AB’ blood group individuals. This is an example of

Complete dominance
Codominance
Incomplete dominance
Partial dominance

Which of the following cannot be detected in a developing foetus by amniocentesis ?

Jaundice
Klinefelter syndrome
Sex of the foetus
Down syndrome

The first stable product of fixation of atmospheric nitrogen in leguminous plants is :

Glutamate
NO$_2$$^-$
Ammonia
NO$_3$$^-$

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

Zero
10
15
05

Secondary productivity is rate of formation of new organic matter by :

Decomposer
Producer
Parasite
Consumer

Infection of Ascaris usually occurs by :

mosquito bite
drinking water containing eggs of Ascaris
eating imperfectly cooked pork.
Tse-tse fly

A small object of uniform density rolls up a curved surface with an initial velocity ‘v’. It reaches upto a maximum height of $\frac{3v^2}{4g}$ with respect to the initial position. The object is

Disc
Ring
Solid sphere
Hollow sphere

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $ \mu _1$ and $ \mu _2$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of combination is

$\frac{2R}{(\mu _1 – \mu_2)}$
$\frac{R}{2(\mu _1 + \mu_2)}$
$\frac{R}{2(\mu _1 – \mu_2)}$
$\frac{R}{(\mu _1 – \mu_2)}$

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

The angular width of central maximum will be unaffacted.
Diffraction pattern is not observed on the screen in the case of electrons.
The angular width of the central maximum of the diffraction pattern will increase.
The angular width of the central maximum will decrease.

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea -eye lens can be estimated to be –

1.5 cm
5 cm
2.5 cm
1.67 cm

The upper half of an inclinded plane of inclination $\theta $ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient
of friction between the block and lower half of the plane is given by:-

$\mu = tan \theta $
$\mu = \frac{1}{tan \theta}$
$\mu = \frac{2}{tan \theta}$
$\mu = 2 tan \theta $

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength 2$ \pi $m and frequency of $\frac{1}{\pi}$ Hz is represented by :

y = sin (2$\pi $x + 2$\pi $t)
y = sin (x – 2t)
y = sin (2$\pi $x – 2$\pi $t)
y = sin (10$\pi $x – 20$\pi $t)

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz, The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz, The unknown frequency is

260 Hz
254 Hz
246 Hz
240 Hz

A coil is self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when :

an iron rod is inserted in the coil.
frequency of the AC source is decreased.
number of turns in the coil is reduced.
A capacitance of reactance X$_C$ = X$_L$ is included in the same circuit.

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become :

$(\frac{2r}{3})$
$(\frac{1}{\sqrt{2}})^2$
$(\frac{r}{\sqrt[3]{2}})$
$(\frac{2r}{\sqrt{3}}$

If we study the vibration of a pipe open at both ends, then the following statement is not true :

Pressure change will be maximum at both ends
Open end will be antinode
Odd harmonics of the fundamental frequency will be generated
All harmonics of the fundamental frequency will be generated

When a proton is released from rest in a room, it starts with an initial acceleration a$_0$ towards west. When it is projected towards north with a speed v$_0$ it moves with an initial acceleration 3a$_0$ towards west. The electric and magnetic fields in the room are:

$\frac{ma_0}{e}$ east, $\frac{3ma_0}{ev_0}$ down
$\frac{ma_0}{e}$ west, $\frac{2ma_0}{ev_0}$ up
$\frac{ma_0}{e}$ west, $\frac{2ma_0}{ev_0}$ down
$\frac{ma_0}{e}$ east, $\frac{3ma_0}{ev_0}$ up

A wire loop is rotated in magnetic field. The frequency of change of direction of the induced e.m.f. is :

Six times per revolution
Once per revolution
twice per revolution
four times per revolution

A uniform force of (3$\hat{i}$ + $\hat{j}$) newton acts on a particle of mass 2kg. Hence the particle is displaced from osition (2$\hat{i}$ + $\hat{k}$ ) meter to position (4$\hat{i}$ + 3$\hat{j}$ – $\hat{k}$ ) meter. The work done by the force on the particle is :-

15 J
9 J
6 J
13 J

The wettability of a surface by a liquid depends primarily on :-

angle of contact between the surface and the liquid
viscosity
surface tension
density

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1m, 2m, 4m, 8m, …., respectively, from the origin. The resulting gravitational potential due to this system at the origin will be :

–4G
–G
$-\frac{8}{3} G$
$-\frac{4}{3} G$

The value of Planck’s constant is 6.63 × 10$^{-34}$ Js. The speed of light is 3 × 10$^{17}$ nm s$^{–1}$. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 10$^{15}$ s$^{–1}$ ?

75
10
25
50

6p–orbitals and 7 unpaired electrons
6p–orbitals and 6 unpaired electrons
7p–orbitals and 6 unpaired electrons
7p–orbitals and 7 unpaired electrons

Which of the following is electron-deficient ?

PH$_3$
(CH$_3$)$_2$
(SiH$_3$) $_2$
(BH$_3$)$_2$

Which of the following statements about the interstitial compounds is incorrect?

They have higher melting points than the pure metal
They retain metallic conductivity
They are chemically reactive
They are much harder than the pure metal

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $H N O$_3$$ ? The concentrated acid is 70% $H N O$_3$$

45.0 g conc. HNO $_3$
54.0 g conc. HNO $_3$
70.0 g conc. HNO $_3$
90.0 g conc.HNO $_3$

Which of the following lanthanoid ions is diamagnetic?
(Atoms, Ce = 58, Sm = 62, Yb = 70)

Yb$^{2+}$
Ce$^{2+}$
Sm$^{2+}$
Eu$^{2+}$

Which one of the following molecules contains no $\pi $ bond ?

NO$^2$
CO$^2$
H$^2$O
SO$^2$

Based on equation E = –2.178 × 10$^{–18}$ J $(\frac{Z^2}{n^2})$ certain conclusions are written. Which of them is not correct ?

For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more lossely bound in the smallest allowed orbit.
The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus
Larger the value of n, the larger is the orbit radius
Equation can be used to calculate the change in energy when the electron change orbit

In the reaction

H$^+$/H$_2$O
HgSO$_4$/H$_2$SO$_4$
Cu$_2$Cl$_2$
H$_3$PO$_2$ and H$_2$O

The order of stability of the following tautomeric compounds is :-

II > III > I
I > II > III
III > II > I
II > I > III

Nylon is an example of :-

Polythene
Polyester
Polysaccharide
Polymide

XeF$_2$ is isostructural with :-

BaCl$_2$
TeF$_2$
ICl$_2$ $^-$
SbCl$_3$

The basic structural unit of silicates is :-

SiO $_4 ^{2–}$
SiO$^–$
SiO$_4 ^{4–}$
SiO$_3 ^{2-}$

Which of the following structure is similar to graphite?

B$_2$H$_6$
BN
B
B$_4$C

The structure of isobutyl group in an organic compound is :-

The number of carbon atoms per unit cell of diamond unit cell is :-

1
4
8
6

An excess of AgNO$_3$ is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be :-

0.01
0.001
0.002
0.003

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, l = 1 and , = –1

2
10
6
4

Which of these is not a monomer for a high molecular mass silicone polymer ?

PbSiCl$_3$
MeSiCl$_3$
Me$_2$SiCl$_2$
Me$_3$SiCl

A reaction having equal energies of activation for forward and reverse reactions has :-

$\triangle $ H = $\triangle $ G = $\triangle $ S = 0
$\triangle $ S = 0
$\triangle $ G = 0
$\triangle $ H = 0

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm$^{–1}$ cm$^2$ mol$^{–1}$ and at infinite dilution its molar conductance is 238 ohm$^{–1}$ cm$^2$ mol$^{–1}$. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :-

40.800%
2.080%
20.800%
4.008%

Structure of the compound whose IUPAC name is 3–Ethyl–2–hydroxy–4–methylhex–3–en–5–ynoic acid is :-

Among the following ethers, which one will produce methyl alcohol on treatement with hot concentrated HI ?

Antiseptics and disinfectants either kill or prevent growth of microganisms. Identify which of the following statements is not true :-

Disinfectants harm the living tissues
A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant
Chlorine and Iodine are used as strong disinfectants
Dilute solutions of Boric acid and Hydrogen Peroxide are strong antiseptics

A magnetic moment of 1.73 BM will be shown by one among the following :-

[CoCl$_6$] $^{4–}$
[Cu(NH$_3$)$_4$] $^{2+}$
[Ni(CN)$_4$] $^{2–}$
TiCl$_4$

KMnO$_4$ can be prepared from K$_2$MnO$_4$ as per the reaction:-

The reaction can go to compition by removing OH$^–$ ions by addings :-

SO$_2$
HCl
KOH
CO$_2$

Reaction by which Benzaldehyde cannot be prepared :-

Which of the following does not give oxygen on heating ?

(NH$_4$)$_2$Cr$_2$O$_7$
KClO$_3$
Zn(ClO$_3$)
K$_2$Cr$_2$O$_7$

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72g cm$^{–3}$. The molar mass of the metal is :-

20g mol$^{–1}$
40g mol$^{–1}$
30g mol$^{–1}$
28g mol$^{–1}$

Dipole induced dipoloe interactions are present in which of the following pairs :-

SiF$_4$ and He atoms
H$_2$O and alcohol
Cl$_2$ and CCl$_4$
HCl and He atoms

Figure shows schematic plan of blood circulation in humans with labels A to D, Identify the label and give its function/s.

D-Dorsal aorta-takes blood from heart to body parts, PO$_2$ = 95 mm Hg
A-Pulmonary vein-takes impure blood from body parts, PO$_2$ = 60 mm Hg
B-Pulmonary artery-takes blood from heart to lungs, PO$_2$ = 90 mm Hg
C-Vena Cava-takes blood from body parts the right auricle, PCO$_2$ = 45 mm Hg

The tendency of population to remain in genetic equilibrium may be disturbed by :

lack of random mating
random mating
lack of migration
lack of mutations

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D.

C-Neurotransmitter D-Ca$^{++}$
A-Receptor C-Synaptic vescles
B-Synaptic connection D-K$^+$
A-Neurotransmitter B-Synaptic cleft

A good producer of citric acid is :

Saccharomyces
Aspergillus
Pseudomonas
Clostridium

Age of a tree can be estimated by :

diameter of its heartwood
its height and girth
biomass
number of annual rings

The process by which organisms with different evolutionary history evolve similar phenotypic adaptation in response to a common environmental challenge, is called :

Adaptive radiation
Natural selection
Convergent evolution
Non-random evolution

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characterstics.

Telophase – Endoplasmic reticulum and nucleolus not reformed yet.
Telophase – Nuclear envelop reforms, golgi complex reforms.
Late anaphase – Chromosomes move a away from equatorial plate, golgi complex not present.
Cytokinesis – Cell plate formed, mitochondria distributed between two daughter cells.

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic :-

D – Lower end of lungs – diaphragm pulls it down during inspiration
A – trachea – long tube supported by complete cartilaginous rings for conducting inspired air
B – pleural membrane – surround ribs on both sides to provide cushion against rubbing
C – Alveoli – thin walled vascular bag like structures for exchange of gases

Interfascicular cambium develops from the cells of:

Pericycle
Medullary rays
Xylem parenchyma
Endodermis

During seed germination its stored food is mobilized by :

Gibberellin
Ethylene
Cytokinin
ABA

Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smel of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. It aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is :-

SO$_3$
H$_2$S
SO$_2$
CO$_2$

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

–NO$_2$
–C$\equiv $N
–SO$_3$H
–COOH

Nitrobenzene on reaction with conc. HNO$_3$/H$_2$SO$_4$ at 80-100°C forms which one of the following products ?

1, 2, 4-Trinitrobenzene
1, 2-Dinitrobenzene
1, 3-Dinitrobenzene
1, 4-Dinitrobenzene

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ?

1.81 V
0.059 V
0.59 V
0.118 V

Which of the following is a polar molecule ?

XeF$_4$
BF$_3$
SF$_4$
SiF$_4$

A button cell used in watches function as following

Zn(s) + Ag$_2$O(s) + H$_2$O($l$) $\rightleftharpoons $ 2Ag(s) +
Zn$^{2+}$(aq) + 2OH$^–$ (aq)

If half cell potentials are

Zn$^{2+}$(aq) + 2e$^–$ $\to $ Zn(s); E$^o$ = –0.76V

Ag$_2$O(s) + H$_2$O($l$) + 2e$^-$ $\to $ 2Ag(s) + 2OH$^-$ (aq);

E° = 0.34V
The cell potential will be :-

1.34 V
1.10 V
0.42 V
0.84 V

Which of these is least likely to act as a Lewis base?

PF$_3$
CO
F$^-$
BF$_3$

Which of the following compounds will not undergo Friedal-Craft’s reaction easily :-

Toluene
Cumene
Xylene
Nitrobenzene

Which is the monomer of Neoprene in the following ?

6.02 × 10$^{20}$ molecules of urea are present in 100mL of its solution. The concentration of solution is :-

0.1 M
0.02 M
0.01 M
0.001M

Maximum deviation from ideal gas is expected from :

NH$_3$(g)
H$_2$(g)
N$_2$(g)
CH$_4$(g)

Which of the following is paramagnetic ?

NO$^+$
CO
O$_2^-$
CN$^–$

Identify the correct order of solubility in aqueous medium :

Na$_2$S > ZnS > CuS
CuS > ZnS > Na$_2$S
ZnS > Na$_2$S > CuS
None of these

What is the activation energy for a reaction it its rate doubles when the temperature is raised from 20°C to 35°C ? (R = 8.314 J mol$^{–1}$ K$^{–1}$)

15.1 kJ mol$^{–1}$
342 kJ mol$^{–1}$
269 kJ mol$^{–1}$
34.7 kJ mol$^{–1}$

Which is the strongest acid in the following ?

H$_2$SO$_3$
H$_2$SO$_4$
HClO$_3$
HClO$_4$

Meiosis takes place in :

Megaspore
Meiocyte
Conidia
Gemmule

According to Darwin, the organic evolution is due to :

Reduced feeding efficiency in one species due to the presence of interfering species
Intraspecific competition
Interspecific competition
Competition within closely related species

Which of the following criteria does not pertain to facillitated transport ?

Uphill transport
Requirement of special membrane proteins
High selectivity
Transport saturation

A major site for synthesis of lipids is :

Nucleoplasm
RER
SER
Symplast

Natural reservoir of phosphorus is :

Fossils
Sea water
Animal bones
Rock

Which of the metabolites is common to respiration- mediated breakdown of fats, carbohydrates and proteins ?

Acetyl CoA
Glucose–6–phosphate
Fructose1,6–bisphosphate
Pyruvic acid

Which one of the following processes during decomposition is correctly described ?

Leaching – Water soluble inorganic nutrients rise to the top layers of soil
Fragmentation – Carried out by organisms such as earthworm
Humification – Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
Catabolism – Last step in the decomposition under fully anaerobic condition

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

100%
No chance
50%
25%

Which of the following statements is not true of two genes that show 50% recombination frequency ?

If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
The genes may be on different chromosomes
The genes are tightly linked
The genes show independent assortment

One of the legal methods of birth control is :

by a premuture ejaculation during coitus
abortion by taking an appropriate medicine
by abstaining from coitus from day 10 to 17 of the menstrual cycle
by having coitus at the time of day break

Besides paddy fields, cyanobacteria are also found inside vegetative part of :

Psilotum
Pinus
Cycas
Equisetum

Which of the following are correctly matched with respect to their taxonomic classification ?

Spiny anteater, sea urchin, sea cucumber – Echinodermata
Flying fish, cuttlefish, silverfish – Pisces
Centipede, millipede, spider, scorpion – Insecta
House fly, butterfly, tsetsefly, silverfish – Insecta

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :

Genetic load
Genetic flow
Genetic drift
Random mating

Select the correct match of the digested products in humans given in with their absorption site and mechanism.

Cholesterol, maltose – Large intestine, active absorption
Glycine, glucose – small intestine, active absorption
Fructose, Na$^+$ – small intestine, passive absorption
Glycerol, fatty acids – duodenum, move as chilomicrons

Select the wrong statement :

Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy
Isogemetes are similar in structure, function and behaviour
Anisogametes differ either in structure, function or behaviour
In Oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

Which Mendelism idea is depicted by a cross in which the F$_1$ generation resembles both the parents ?

co-dominance
incomplete dominance
law of dominance
inheritance of one gene

The diagram given here is the standard ECG of a normal person. The P- wave represents the :

End of systole
Contraction of both the atria
Initiation of the ventricular contraction
Beginning of the systole

Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene ?

Lactose permease and transacetylase
$\beta $galactosidase
Lactose permease
Transacetylase

The most abundant intracellular cation is :

K$^+$
Na$^+$
Ca$^{++}$
H$^+$

Which one of the following is not the function of placenta ? It :-

secretes oxytocin during parturition
facilitates supply of oxygen and nutrients to embyro
secretes estrogen
facilitates removal of carbon dioxide and waste material from embryo

In plant breeding programme, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called :

germplasm collection
selection of superior recombinants
cross – hybridisation among the selected parents.
evaluation and selection of parents

Which one of the following is not a correct statements ?

Key is taxonomic aid for identification of specimens
Herbarium houses dried, pressed and preserved plant specimens
Botanical gardens have collection of living plants for reference
A museum has collection of photographs of plants and animals

Which one of the following organelle in the figure correctly matches with its function ?

Rough endoplasmic reticulum, protein synthesis
Rough endoplasmic reticulum, formation of glycoproteins
Golgi apparatus, protein synthesis
Golgi apparatus, formation of glycolipids

Which of the following represents maximum number of species among global biodiversity ?

Mosses and Ferns
Algae
Lichens
Fungi

Which of the following Bt crops is being grown in India by the farmers ?

Soyabean
Maize
Cotton
Brinjal

Read the following statements (A – E) and answer the question which follows them.

(a) In liverworts, mosses and ferns gametophytes are free living

(b) Gymnosperms and some ferns are heterosporous

(c) Sexual reproduction in Fucus, Volvox and Allbugo is oogamous

(d) The sporophyte in liverworts is more elaborate than that in mosses

(E) Both, Pinus and Marchantia are dioecious

How many of the above statements are correct ?

Four
One
Two
Three

The essential chemical components of many coenzymes are :

Vitamins
Proteins
Nucleic acids
Carbohydrates

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-

D- Choroid – its anterior part forms ciliary body
A – Retina – contains photo receptors–rods and cones
B – Blind spot – has only a few rods and cones
C – Aqueous chamber reflects the light which does not pass through the lens

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.

Arrow numberd 4, 8 and 12 can all be :

FAD$^+$ or FADH$^2$
NADH
ATP
H$^2$O

Pigment-containing membranous extensions in some cyanobacteria are :

Chromatophores
Heterocysts
Basal bodies
Pneumatophores

Which one of the following statements is correct ?

Tapetum nourishes the developing pollen
Hard outer layer of pollen is called intine
Sporogenous tissue is haploid
Endothecium produces the micorspores

The characteristics and an example of a synovial joint in humans is :-

lymph filled between two bones, limited movement – gliding joint between carpals
fluid cartilage between two bones, limited movements – Knee joint
fluid filled between two joints, provides cushion – skull bones
fluid filled synovial cavity between two bones – joint between atlas and axis

The Air Prevention and Control of Pollution Act came into force in :

1990
1975
1981
1985

Product of sexual reproduction generally generates:

Large biomass
Longer viability of seeds
Prolonged dormancy
New genetic combination leading to variation

Among bitter gourd, mustard, brinjal, pumpkin chinarose, lupin, cucumber, sunnhemp, gram, guava, bean, chilli, plum, petunia, tomato, rose, withania, potato, onion, aloe and tulip how many plants have hypogynous flower ?

Eighteen
Six
Ten
Fifteen

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of :

Over secretion of pars distalis
Deficiency of iodine in diet
Low secretion of growth hormone
Cancer of the thyroid gland

Which of the following is not correctly matched for the organism and its cell wall degrading enzyme?

Fungi – Chitinase
Bacteria – Lysozyme
Plant cells – Cellulase
Algae – Methylase

Menstrual flow occurs due to lack of :

Vasopressin
Progesteron
FSH
Oxytocin

Global warming can be controlled by :

Increasing deforestation, reducing efficiency of energy usage
Reducing deforestation cutting down use of fossil fuel
Reducing reforestation, increasing the use of fossil fuel
Increasing deforestation slowing down the growth human population

Which one of the following is not used for ex situ plant conservation ?

Botanical Gardens
Field gene banks
Seed banks
Shifting cultivation

During sewage treatment, biogases are produced which include :

hydrogensulphide, nitrogen, methane
methane, hydrogensulphide, carbon dioxide
methane, oxygen, hydrogensulphide
hydrogensulphide, methane, sulphur dioxide

The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C :

A–translation B–extension C–Rosalind Franklin
A–transcription B–replication C–James Watson
A–translation B–transcription C–Erevin Chargaff
A–transcription B–translation C–Francis Crick

DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by :

Restriction mapping
Centrifugation
Polymerase chain reaction
Electrophoresis

The complex formed by a pair of synapsed homologous chromosomes is called :

Axoneme
Equatorial plate
Kinetochore
Bivalent

The incorrec t statement with regard to Haemophilia is :

A single protein involved in the clotting of blood is affected
It is a sex-linked disease
It is a recessive disease
It is a dominant disease

Which of the following statements is correct in relation to the endocrine system ?

Releasing and inhibitory hormones are produced by the pituitary gland
Adenohypophysis is under direct neural regulation of the hypothalamus
Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones
Non-nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones

Lenticels are involved in :

Photosynthesis
Transpiration
Gaseous exchange
Food transport

Match the name of the animal (column I), with one characteristics (column II), and the phylum/class (column III) to which it belongs :

What is the correct sequence of sperm formation?

Spermatogonia, spermatocyte, spermatid, spermatozoa
Spermatid, spermatocyte, spermatogonia, spermatozoa
Spermatogonia, spermatocyte, spermatozoa, spermatid
Spermatogonia, spermatozoa, spermatocyte, spermatid

Macro molecule chitin is :

Simple polysaccharide
Nitrogen containing polysacchairde
Phosphorus containing polysaccharide
Sulphur containing polysaccharide

Official NEET UG 2013

Official NEET UG 2013

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