NEET 2018
Paper was held on
Sun, May 6, 2018 10:00 AM
Biology
1
Select the correct statement :
2
All of the following are part of an operon except
3
In a growing population of a country,
4
AGGTATCGCAT is a sequence from the coding
strand of a gene. What will be the corresponding
sequence of the transcribed mRNA?
5
In India, the organisation responsible for
assessing the safety of introducing genetically
modified organisms for public use is
6
A 'new' variety of rice was patented by a
foreign company, though such varieties have
been present in India for a long time. This is
related to
7
A woman has an X-linked condition on one of
her X chromosomes. This chromosome can be
inherited by
8
The difference between spermiogenesis and
spermiation is
9
The contraceptive ‘Saheli’
10
The experimental proof for semi-conservative
replication of DNA was first shown in a
11
Conversion of milk to curd improves its
nutritional value by increasing the amount of
12
The similarity of bone structure in the forelimbs
of many vertebrates is an example of
13
According to Hugo de Vries, the mechanism of
evolution is
14
Which of the following is not an autoimmune
disease?
15
Which of the following is commonly used as a
vector for introducing a DNA fragment in
human lymphocytes?
16
In which disease does mosquito transmitted
pathogen cause chronic inflammation of
lymphatic vessels?
17
Which one of the following plants shows a
very close relationship with a species of moth,
where none of the two can complete its life
cycle without the other?
18
Which one of the following population
interactions is widely used in medical science
for the production of antibiotics?
19
All of the following are included in ‘ex-situ
conservation’ except
20
The amnion of mammalian embryo is derived
from
21
Pollen grains can be stored for several years
in liquid nitrogen having a temperature of
22
Among the following sets of examples for
divergent evolution, select the incorrect option.
23
Match the items given in column I with those in
column II and select the correct option given
below.
| Column I (Function) |
Column II (Part of excretory system) |
|---|---|
| A. Ultrafiltration | (i) Henle’s loop |
| B. Concentration of urine | (ii) Ureter |
| C. Transport of urine | (iii) Urinary bladder |
| D. Storage of urine | (iv) Malpighian corpuscle |
| (v) Proximal convoluted tubule |
24
The Golgi complex participates in
25
Which of the following options correctly
represents the lung conditions in asthma and
emphysema, respectively?
26
Oxygen is not produced during photosynthesis by
27
Which of the following organisms are known as chief producers in the oceans?
28
What is the role of NAD+ in cellular respiration?
29
Nissl’s bodies are mainly composed of
30
Which of the following statements is correct?
31
Which one of these animals is not a homeotherm?
32
The stage during which separation of the paired
homologous chromosomes begins is
33
After karyogamy followed by meiosis, spores are produced exogenously in
34
Match the items given in column I with those in column II and select the correct option given below.
| Column I | Column II |
|---|---|
| A. Herbarium | (i) It is a place having a collection of preserved plants and animals. |
| B. Key | (ii) A list that enumerates methodically all the species found in an area with brief description aiding identification. |
| C. Museum | (iii) Is a place where dried and pressed plant specimens mounted on sheets are kept. |
| D. Catalogue | (iv) A booklet containing a list of characters and their alternates which are helpful in identification of various taxa. |
35
Casparian strips occur in
36
Which of the following events does not occur
in rough endoplasmic reticulum?
37
Which of the following is an occupational
respiratory disorder?
38
Which of the following hormones can play a
significant role in osteoporosis?
39
Which of the following structures or regions is
incorrectly paired with its functions?
40
Select the wrong statement.
41
Plants having little or no secondary growth are
42
Identify the vertebrate group of animals characterised by crop and gizzard in its digestive system.
43
Which of the following features is used to identify a male cockroach from a female cockroach?
44
Ciliates differ from all other protozoans in
45
Stomata in grass leaf are
46
Secondary xylem and phloem in dicot stem are produced by
47
Select the incorrect match.
48
Match the items given in column I with those in
column II and select the correct option given
below.
| Column I | Column II |
|---|---|
| A. Tricuspid valve | (i) Between left atrium and left ventricle |
| B. Bicuspid valve | (ii) Between right
ventricle and
pulmonary artery |
| C. Semilunar valve | (iii) Between right
atrium and right
ventricle |
49
Which one is wrongly matched?
50
Which of the following is true for nucleolus?
51
Match the items given in column I with those in
column II and select the correct option given below.
| Column I | Column II |
|---|---|
| A. Tidal volume | (i) 2500 – 3000 mL |
| B. Inspiratory reserve volume | (ii) 1100 – 1200 mL |
| C. Expiratory reserve volume | (iii) 500 – 550 mL |
| D. Residual volume | (iv) 1000 – 1100 mL |
52
Match the items given in column I with those in
column II and select the correct option given
below.
| Column I | Column II |
|---|---|
| A. Glycosuria | (i) Accumulation of uric acid in joints |
| B. Gout | (ii) Mass of crystallised salts within the kidney |
| C. Renal calculi | (iii) Inflammation in glomeruli |
| D. Glomerular nephritis | (iv) Presence of glucose in urine |
53
Match the items given in column I with those in
column II and select the correct option given
below.
| Column I | Column II |
|---|---|
| A. Fibrinogen | (i) Osmotic balance |
| B. Globulin | (ii) Blood clotting |
| C. Albumin | (iii) Defence mechanism |
54
Which among the following is not a prokaryote?
55
Which of the following is not a product of light
reaction of photosynthesis?
56
Calcium is important in skeletal muscle
contraction because it
57
Which of the following is an amino acid derived
hormone?
58
Sweet potato is a modified
59
The two functional groups characteristic of
sugars are
60
Which of these statements is incorrect?
61
Select the correct match :
62
Select the correct match :
63
Which part of poppy plant is used to obtain the
drug “smack”?
64
Natality refers to
65
Many ribosomes may associate with a single
mRNA to form multiple copies of a polypeptide
simultaneously. Such strings of ribosomes are
termed as
66
Hormones secreted by the placenta to maintain
pregnancy are
67
Which of the following has proved helpful in
preserving pollen as fossils?
68
Winged pollen grains are present in
69
The correct order of steps in Polymerase Chain
Reaction (PCR) is
70
Which of the following pairs is wrongly matched?
71
Double fertilization is
72
What type of ecological pyramid would be
obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
73
Match the items given in column I with those in
column II and select the correct option given
below.
| Column - I | Column - II |
|---|---|
| A. Proliferative phase | (i) Breakdown of endometrial lining |
| B. Secretory Phase | (ii) Follicular Phase |
| C. Menstruation | (iii) Luteal Phase |
74
Which of the following animals does not undergo metamorphosis?
75
Pneumatophores occur in
76
Use of bioresources by multinational
companies and organisations without
authorisation from the concerned country and
its people is called
77
Niche is
78
Which of the following characteristics represent 'Inheritance of blood groups' in humans?
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance
a. Dominance
b. Co-dominance
c. Multiple allele
d. Incomplete dominance
e. Polygenic inheritance
Chemistry
1
The correct order of N-compounds in its
decreasing order of oxidation states is
2
Which one of the following ions exhibits d-d
transition and paramagnetism as well?
3
The bond dissociation energies of X2
, Y2
and
XY are in the ratio of 1 : 0.5 : 1. $$\Delta $$H for the
formation of XY is –200 kJ mol–1. The bond
dissociation energy of X2
will be
4
Which of the following carbocations is
expected to be most stable?
5
The correct difference between first and
second order reactions is that
6
The solubility of BaSO4
in water is
2.42 × 10–3 g L–1 at 298 K. The value of its
solubility product (Ksp) will be (Given molar
mass of BaSO4
= 233 g mol–1)
7
Hydrocarbon (A) reacts with bromine by
substitution to form an alkyl bromide which by
Wurtz reaction is converted to gaseous
hydrocarbon containing less than four carbon
atoms. (A) is
8
Nitration of aniline in strong acidic medium
also gives m-nitroaniline because
9
Which of the following compounds can form a
zwitter ion?
10
Which of the following statements is not true
for halogens?
11
The type of isomerism shown by the complex
[CoCl2(en)2] is
12
The compound C7H8
undergoes the following
reactions :
The product ‘C’ is
The product ‘C’ is
13
Which of the following oxides is most acidic in
nature?
14
Consider the change in oxidation state of
bromine corresponding to different emf values
as shown in the given diagram :
Then the species undergoing disproportionation is :
Then the species undergoing disproportionation is :
15
Following solutions were prepared by mixing
different volumes of NaOH and HCl of different
concentrations :
A. 60 mL $${M \over {10}}$$ HCl + 40 mL $${M \over {10}}$$ NaOH
B. 55 mL $${M \over {10}}$$ HCl + 45 mL $${M \over {10}}$$ NaOH
C. 75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH
D. 100 mL $${M \over {10}}$$ HCl + 100 mL $${M \over {10}}$$ NaOH
pH of which one of them will be equal to 1?
A. 60 mL $${M \over {10}}$$ HCl + 40 mL $${M \over {10}}$$ NaOH
B. 55 mL $${M \over {10}}$$ HCl + 45 mL $${M \over {10}}$$ NaOH
C. 75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH
D. 100 mL $${M \over {10}}$$ HCl + 100 mL $${M \over {10}}$$ NaOH
pH of which one of them will be equal to 1?
16
Which of the following is correct with respect
to – I effect of the substituents? (R = alkyl)
17
Match the metal ions given in Column I with
the spin magnetic moments of the ions given
in Column II and assign the correct code :
| Column - I | Column - II |
|---|---|
| A. Co3+ | (i) $$\sqrt 8 $$ B.M. |
| B. Cr3+ | (ii) $$\sqrt {35} $$ B.M. |
| C. Fe3+ | (iii) $$\sqrt 3 $$ B.M. |
| D. Ni2+ | (iv) $$\sqrt {24} $$ B.M. |
| (v) $$\sqrt {15} $$ B.M. |
18
The compound A on treatment with Na gives
B, and with PCl5
gives C. B and C react together
to give diethyl ether. A, B and C are in the order
19
Compound A, C8H10O, is found to react with
NaOI (produced by reacting Y with NaOH) and
yields a yellow precipitate with characteristic
smell. A and Y are respectively
20
A mixture of 2.3 g formic acid and 4.5 g oxalic
acid is treated with conc. H2SO4
. The evolved
gaseous mixture is passed through KOH
pellets. Weight (in g) of the remaining product
at STP will be
21
The geometry and magnetic behaviour of the
complex [Ni(CO)4] are
22
In which case is number of molecules of water
maximum?
23
Which one is a wrong statement?
24
Which one of the following conditions will
favour maximum formation of the product in
the reaction
A2(g) + B2(g) ⇌ X2(g) , $$\Delta $$rH = –X kJ ?
A2(g) + B2(g) ⇌ X2(g) , $$\Delta $$rH = –X kJ ?
25
Carboxylic acids have higher boiling points
than aldehydes, ketones and even alcohols of
comparable molecular mass. It is due to their
26
Iron carbonyl, Fe(CO)5
is
27
Which one of the following elements is unable
to form MF63– ion?
28
In the reaction,
the electrophile involved is
the electrophile involved is
29
For the redox reaction,
MnO4– + C2O4 2– + H+ $$ \to $$ Mn2+ + CO2 + H2O
The correct coefficients of the reactants for the balanced equation are
MnO4– + C2O4 2– + H+ $$ \to $$ Mn2+ + CO2 + H2O
The correct coefficients of the reactants for the balanced equation are
30
The correct order of atomic radii in group 13
elements is
31
Consider the following species : CN+
, CN–
, NO
and CN. Which one of these will have the
highest bond order?
32
In the structure of ClF3
, the number of lone
pairs of electrons on central atom ‘Cl’ is
33
When initial concentration of the reactant is
doubled, the half-life period of a zero order
reaction
34
Which of the following molecules represents
the order of hybridisation sp2
, sp2
, sp, sp from
left to right atoms?
35
The difference between amylose and amylopectin
is
36
Identify the major products P, Q and R in the
following sequence of reactions :
Physics
1
A student measured the diameter of a small
steel ball using a screw gauge of least count
0.001 cm. The main scale reading is 5 mm and
zero of circular scale division coincides with
25 divisions above the reference level. If screw
gauge has a zero error of –0.004 cm, the correct
diameter of the ball is
2
A sample of 0.1 g of water at 100°C and normal
pressure (1.013 × 105
N m–2) requires 54 cal
of heat energy to convert to steam at 100°C.
If the volume of the steam produced is 167.1 cc,
the change in internal energy of the sample, is
3
The kinetic energies of
a planet in an elliptical
orbit about the Sun, at
positions A, B and C are
KA, KB and KC, respectively. AC is the major
axis and SB is perpendicular to AC at the position
of the Sun S as shown in the figure. Then
4
The efficiency of an ideal heat engine working
between the freezing point and boiling point
of water, is
5
The volume (V) of a monatomic
gas varies with its temperature
(T), as shown in the graph. The
ratio of work done by the gas,
to the heat absorbed by it, when
it undergoes a change from state
A to state B, is
6
A moving block having mass m, collides with
another stationary block having mass 4m. The
lighter block comes to rest after collision. When
the initial velocity of the lighter block is v, then
the value of coefficient of restitution (e) will be
7
A set of n equal resistors, of value R each, are
connected in series to a battery of emf E and
internal resistance R. The current drawn is I. Now,
the n resistors are connected in parallel to the
same battery. Then the current drawn from battery
becomes 10I. The value of n is
8
If the mass of the Sun were ten times smaller
and the universal gravitational constant were
ten times larger in magnitude, which of the
following is not correct?
9
The power radiated by a black body is P and it
radiates maximum energy at wavelength, $$\lambda $$0
. If
the temperature of the black body is now
changed so that it radiates maximum energy at
wavelength $${3 \over 4}{\lambda _0}$$, the power radiated by it
becomes nP. The value of n is
10
A pendulum is hung from the roof of a
sufficiently high building and is moving freely
to and fro like a simple harmonic oscillator.
The acceleration of the bob of the pendulum
is 20 m s–2 at a distance of 5 m from the mean
position. The time period of oscillation is
11
At what temperature will the rms speed of
oxygen molecules become just sufficient for
escaping from the Earth’s atmosphere?
(Given : Mass of oxygen molecule (m) = 2.76 × 10–26 kg, Boltzmann’s constant kB = 1.38 × 10–23 J K–1)
(Given : Mass of oxygen molecule (m) = 2.76 × 10–26 kg, Boltzmann’s constant kB = 1.38 × 10–23 J K–1)
12
An object is placed at a distance of 40 cm
from a concave mirror of focal length 15 cm.
If the object is displaced through a distance
of 20 cm towards the mirror, the displacement
of the image will be
13
Three objects, A : (a solid sphere), B : (a thin
circular disk) and C : (a circular ring), each
have the same mass M and radius R. They
all spin with the same angular speed $$\omega $$ about
their own symmetry axes. The amounts of
work (W) required to bring them to rest, would
satisfy the relation
14
Two wires are made of the same material and
have the same volume. The first wire has
cross-sectional area A and the second wire has
cross-sectional area 3A. If the length of the first
wire is increased by $$\Delta $$l on applying a force F,
how much force is needed to stretch the second
wire by the same amount?
15
A tuning fork is used to produce resonance in
a glass tube. The length of the air column in
this tube can be adjusted by a variable piston.
At room temperature of 27°C two successive
resonances are produced at 20 cm and 73 cm
of column length. If the frequency of the tuning
fork is 320 Hz, the velocity of sound in air at
27°C is
16
An electron falls from rest through a vertical
distance h in a uniform and vertically upward
directed electric field E. The direction of electric
field is now reversed, keeping its magnitude the
same. A proton is allowed to fall from rest in it
through the same vertical distance h. The time
of fall of the electron, in comparison to the time
of fall of the proton is
17
A toy car with charge q moves on a frictionless
horizontal plane surface under the influence of
a uniform electric field $$\overrightarrow E $$
. Due to the force q$$\overrightarrow E $$
,
its velocity increases from 0 to 6 m s–1 in one
second duration. At that instant the direction of
the field is reversed. The car continues to move
for two more seconds under the influence of this
field. The average velocity and the average speed
of the toy car between 0 to 3 seconds are
respectively
18
A metallic rod of mass per unit length
0.5 kg m–1 is lying horizontally on a smooth
inclined plane which makes an angle of 30° with
the horizontal. The rod is not allowed to slide
down by flowing a current through it when a
magnetic field of induction 0.25 T is acting on it
in the vertical direction. The current flowing in
the rod to keep it stationary is
19
An inductor 20 mH, a capacitor 100 $$\mu $$F and
a resistor 50 $$\Omega $$ are connected in series across
a source of emf, V = 10 sin 314 t. The power
loss in the circuit is
20
An EM wave is propagating in a medium with
a velocity $$\overrightarrow v = v\widehat i$$. The instantaneous
oscillating electric field of this em wave is
along +y axis. Then the direction of oscillating
magnetic field of the em wave will be along
21
An electron of mass m with an initial velocity
$$\overrightarrow v = {v_0}\widehat i$$ (v0 > 0)
enters an electric field
$$\overrightarrow E = - {\overrightarrow E _0}\widehat i$$
(E0
= constant > 0) at t = 0. If $$\lambda $$0
is its de-Broglie wavelength initially, then its
de- Broglie wavelength at time t is
22
In Young’s double slit experiment the
separation d between the slits is 2 mm, the
wavelength $$\lambda $$ of the light used is 5896 $$\mathop A\limits^0 $$ and
distance D between the screen and slits is
100 cm. It is found that the angular width of
the fringes is 0.20o. To increase the fringe
angular width to 0.21o (with same $$\lambda $$ and D)
the separation between the slits needs to be
changed to
23
When the light of frequency 2$${\upsilon _0}$$
(where $${\upsilon _0}$$
is
threshold frequency), is incident on a metal
plate, the maximum velocity of electrons
emitted is v1
. When the frequency of the
incident radiation is increased to 5$${\upsilon _0}$$
, the
maximum velocity of electrons emitted from
the same plate is v2
. The ratio of v1
to v2
is
24
An astronomical refracting telescope will have
large angular magnification and high angular
resolution, when it has an objective lens of
25
The ratio of kinetic energy to the total energy
of an electron in a Bohr orbit of the hydrogen
atom, is
26
In the combination of the following gates
the output Y can be written in terms of inputs
A and B as
27
In a p-n junction diode, change in temperature
due to heating
28
The refractive index of the material of a prism
is $$\sqrt 2 $$ and the angle of the prism is 30°. One
of the two refracting surfaces of the prism is
made a mirror inwards, by silver coating. A
beam of monochromatic light entering the
prism from the other face will retrace its path
(after reflection from the silvered surface) if
its angle of incidence on the prism is
29
Unpolarised light is incident from air on a
plane surface of a material of refractive index
$$\mu $$. At a particular angle of incidence i, it is
found that the reflected and refracted rays
are perpendicular to each other. Which of
the following options is correct for this
situation?
30
The electrostatic force between the metal plates
of an isolated parallel plate capacitor C having
a charge Q and area A, is
31
The magnetic potential energy stored in a
certain inductor is 25 mJ, when the current
in the inductor is 60 mA. This inductor is of
inductance
32
A thin diamagnetic rod is placed vertically
between the poles of an electromagnet. When
the current in the electromagnet is switched
on, then the diamagnetic rod is pushed up, out
of the horizontal magnetic field. Hence the rod
gains gravitational potential energy. The work
required to do this comes from
33
Which one of the following statements is
incorrect?
34
A block of mass m is placed on a smooth inclined
wedge ABC of inclination q as shown in the
figure. The wedge is given an acceleration ‘a’
towards the right. The relation between a and q
for the block to remain stationary on the wedge
is
35
The fundamental frequency in an open organ
pipe is equal to the third harmonic of a closed
organ pipe. If the length of the closed organ
pipe is 20 cm, the length of the open organ
pipe is
36
Current sensitivity of a moving coil
galvanometer is 5 div/mA and its voltage
sensitivity (angular deflection per unit voltage
applied) is 20 div/V. The resistance of the
galvanometer is
37
A solid sphere is rotating freely about its
symmetry axis in free space. The radius of
the sphere is increased keeping its mass same.
Which of the following physical quantities
would remain constant for the sphere?
38
A solid sphere is in rolling motion. In rolling
motion a body possesses translational kinetic
energy (Kt) as well as rotational kinetic energy
(Kr) simultaneously. The ratio Kt
: (Kt + Kr)
for the sphere is
39
A body initially at rest
and sliding along a
frictionless track from
a height h (as shown
in the figure)
just completes a vertical circle of diameter
AB = D. The height h is equal to
40
A small sphere of radius ‘r’ falls from rest in a
viscous liquid. As a result, heat is produced
due to viscous force. The rate of production of
heat when the sphere attains its terminal velocity,
is proportional to
41
The moment of the force, $$\overrightarrow F = 4\widehat i + 5\widehat j - 6\widehat k$$ at
(2, 0, –3), about the point (2, –2, –2), is given by
(2, 0, –3), about the point (2, –2, –2), is given by
42
A carbon resistor of (47 $$ \pm $$ 4.7) k$$\Omega $$ is to be marked
with rings of different colours for its identification.
The colour code sequence will be
43
A battery consists of a variable number n of
identical cells (having internal resistance r each)
which are connected in series. The terminals
of the battery are short-circuited and the current
I is measured. Which of the graphs shows the
correct relationship between I and n?