Official NTA NEET-UG 2018 question paper, set SS. 174 questions across Physics, Chemistry, and Biology with worked solutions and the official answer key.
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 10 I. The value of ‘n’ is
9
20
11
10
A carbon resistor of (47 ± 4·7) k Ω is to be marked with rings of different colours for its identification. The colour code sequence will be
Green – Orange – Violet – Gold
Yellow – Green – Violet – Gold
Yellow – Violet – Orange – Silver
Violet – Yellow – Orange – Silver
The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are K A , K B and K C , 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
K B < K A < K C
K B > K A > K C
K A > K B > K C
K A < K B < K C
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 ?
‘g’ on the Earth will not change.
Time period of a simple pendulum on the Earth would decrease.
Walking on the ground would become more difficult.
Raindrops will fall faster.
A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (K t ) as well as rotational kinetic energy (K r ) simultaneously. The ratio K t : (K t + K r ) for the sphere is
2 : 5
10 : 7
5 : 7
7 : 10
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 ?
Angular momentum
Rotational kinetic energy
Moment of inertia
Angular velocity
Unpolarised light is incident from air on a plane surface of a material of refractive index ‘ μ ’. 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 ?
i = tan – 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ μ 1
i = sin – 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ μ 1
Reflected light is polarised with its electric vector perpendicular to the plane of incidence
Reflected light is polarised with its electric vector parallel to the plane of incidence
In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength λ of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0·20 ° . To increase the fringe angular width to 0·21 ° (with same λ and D) the separation between the slits needs to be changed to
1·7 mm
2·1 mm
1·9 mm
1·8 mm
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
7 2
3 1
3 2
5 2
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
16 cm
12·5 cm
8 cm
13·2 cm
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
12·5%
6·25%
20%
26·8%
At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from th e Earth’s atmosphere ? (Given : Mass of oxygen molecule (m) = 2·76 × 10 – 26 kg Boltzmann’s constant k B = 1·38 × 10 – 23 J K – 1 )
1·254 × 10 4 K
5·016 × 10 4 K
8·360 × 10 4 K
2·508 × 10 4 K
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field → E . Due to the force q , E → its velocity increases from 0 to 6 m/s 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
1·5 m/s, 3 m/s
1 m/s, 3·5 m/s
1 m/s, 3 m/s
2 m/s, 4 m/s
A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure . The wedge is given an acceleration ‘a’ towards the right. The relation between a and θ for the block to remain stationary on the wedge is
a = g tan θ
a = g cos θ
a = θ sin g
a = θ ec cos g
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
0·529 cm ACHLA/AA/Page 7 SPACE FOR ROUGH WORK English
0·053 cm
0·525 cm
0·521 cm
The moment of the force, → F = 4 ^ i + 5 ^ j – 6 ^ k at (2, 0, – 3), about the point (2, – 2, – 2), is given by
– 7 ^ i – 4 ^ j – 8 ^ k
– 7 ^ i – 8 ^ j – 4 ^ k
– 4 ^ i – ^ j – 8 ^ k
– 8 ^ i – 4 ^ j – 7 ^ k
An em wave is propagating in a medium with a velocity → V = V ^ 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
– x direction
– y direction
+ z direction
– z direction
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
13·89 H ACHLA/AA/Page 5 SPACE FOR ROUGH WORK English
1·389 H
138·88 H
0·138 H
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
36 cm towards the mirror
30 cm towards the mirror
36 cm away from the mirror
30 cm away from the mirror
The refractive index of the material of a prism is 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
zero
30 °
45 °
60 °
In the circuit shown in the figure, the input voltage V i is 20 V, V BE = 0 and V CE = 0. The values of I B , I C and β are given by
I B = 40 μ A, I C = 5 mA, β = 125
I B = 20 μ A, I C = 5 mA, β = 250
I B = 25 μ A, I C = 5 mA, β = 200
I B = 40 μ A, I C = 10 mA, β = 250
In a p-n junction diode, change in temperature due to heating
affects the overall V – I characteristics of p-n junction
does not affect resistance of p-n junction
affects only forward resistance
affects only reverse resistance
In the combination of the following gates the output Y can be written in terms of inputs A and B as
B A .
B A . + A . B
A . – B + – A . B
B A +
The power radiated by a black body is P and it radiates maximum energy at wavelength, λ 0 . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 4 3 λ 0 , the power radiated by it becomes nP. The value of n is
256 81
81 256
3 4
4 3
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 Δ l on applying a force F, how much force is needed to stretch the second wire by the same amount ?
F
4 F
6 F
9 F
A sample of 0·1 g of water at 100 ° C and normal pressure (1·013 × 10 5 Nm – 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
84·5 J ACHLA/AA/Page 8 SPACE FOR ROUGH WORK English
42·2 J
208·7 J
104·3 J
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
r 4
r 5
r 2
r 3
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
11·32 A
14·76 A
5·98 A
7·14 A
An inductor 20 mH, a capacitor 100 μ F and a resistor 50 Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is
1·13 W
2·74 W
0·43 W
0·79 W
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
the induced electric field due to the changing magnetic field
the lattice structure of the material of the rod
the magnetic field
the current source
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
500 Ω ACHLA/AA/Page 6 SPACE FOR ROUGH WORK English
250 Ω
25 Ω
40 Ω
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
300 m/s
350 m/s
339 m/s
330 m/s
The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
inversely proportional to the distance between the plates.
proportional to the square root of the distance between the plates.
linearly proportional to the distance between the plates.
independent of the distance between the plates.
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
1 s
2 s
π s
2 π s
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
equal
10 times greater
5 times greater
smaller
An electron of mass m with an initial velocity → V = V 0 ^ i (V 0 > 0) enters an electric field → E = – E 0 ^ i (E 0 = constant > 0) at t = 0. If λ 0 is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is
λ 0
λ 0 t
λ 0 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + t mV eE 1 0 0
⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + λ t mV eE 1 0 0 0
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
1 : – 2
2 : – 1
1 : – 1
1 : 1
When the light of frequency 2 v 0 (where v 0 is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is v 1 . When the frequency of the incident radiation is increased to 5 v 0 , the maximum velocity of electrons emitted from the same plate is v 2 . The ratio of v 1 to v 2 is
2 : 1 ACHLA/AA/Page 4 SPACE FOR ROUGH WORK English
4 : 1
1 : 4
1 : 2
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
15
30
10
20
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 ω about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation
W A > W C > W B
W B > W A > W C
W A > W B > W C
W C > W B > W A
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
4 5 D
5 7 D
D
2 3 D
Which one of the following statements is incorrect ?
Coefficient of sliding friction has dimensions of length.
Frictional force opposes the relative motion.
Limiting value of static friction is directly proportional to normal reaction.
Rolling friction is smaller than sliding friction.
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
0·4
0·8
0·25
0·5
The similarity of bone structure in the forelimbs of many vertebrates is an example of
Adaptive radiation
Convergent evolution
Analogy
Homology
In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels ?
Amoebiasis
Ringworm disease
Ascariasis
Elephantiasis
Conversion of milk to curd improves its nutritional value by increasing the amount of
Vitamin E
Vitamin B 12
Vitamin A
Vitamin D
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, c and e
b, d and e
a, b and c
b, c and e
Among the following sets of examples for divergent evolution, select the incorrect option :
Eye of octopus, bat and man
Brain of bat, man and cheetah
Heart of bat, man and cheetah
Forelimbs of man, bat and cheetah
Which of the following is not an autoimmune disease ?
Vitiligo
A lzheimer’s disease
Rheumatoid arthritis
Psoriasis
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. |
a b c d
iii iv i ii
ii iv iii i
i iv iii ii
iii ii i iv
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 a b c
ii i iii
iii i ii
i iii ii
i ii iii
The contraceptive ‘SAHELI’
is a post-coital contraceptive.
is an IUD.
increases the concentration of estrogen and prevents ovulation in females.
blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
The amnion of mammalian embryo is derived from
ectoderm and endoderm
mesoderm and trophoblast
endoderm and mesoderm
ectoderm and mesoderm
The difference between spermiogenesis and spermiation is
In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
Hormones secreted by the placenta to maintain pregnancy are
hCG, progestogens, estrogens, glucocorticoids
hCG, hPL, progestogens, estrogens
hCG, hPL, estrogens, relaxin, oxytocin
hCG, hPL, progestogens, prolactin
Which of the following gastric cells indirectly help in erythropoiesis ?
Parietal cells
Goblet cells
Mucous cells
Chief cells
Match the items given in Column I with those in Column II and select the correct option given below:
| Column I | Column II |
| a. Eutrophication | i. UV-B radiation |
| b. Sanitary landfill | ii. Deforestation |
| c. Snow blindness | iii. Nutrient enrichment |
| d. Jhum cultivation | iv. Waste disposal |
a b c d
ii i iii iv
i iii iv ii
i ii iv iii
iii iv i ii
Calcium is important in skeletal muscle contraction because it
prevents the formation of bonds between the myosin cross bridges and the actin filament. ACHLA/AA/Page 21 SPACE FOR ROUGH WORK English
detaches the myosin head from the actin filament.
activates the myosin ATPase by binding to it.
binds to troponin to remove the masking of active sites on actin for myosin.
Which of the following is an occupational respiratory disorder ?
Emphysema
Botulism
Silicosis
Anthracis
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 a b c
iii i ii ACHLA/AA/Page 20 SPACE FOR ROUGH WORK English
iii ii i
i iii ii
ii iii i
Which one of the following population interactions is widely used in medical science for the production of antibiotics ?
Amensalism
Parasitism
Mutualism
Commensalism
Which part of poppy plant is used to obtain the drug ‘‘Smack’’ ?
Leaves
Roots
Latex
Flowers
In a growing population of a country,
pre-reproductive individuals are less than the reproductive individuals.
reproductive and pre-reproductive individuals are equal in number.
reproductive individuals are less than the post-reproductive individuals.
pre-reproductive individuals are more than the reproductive individuals.
All of the following are included in ‘Ex -situ conservation’ except
Seed banks
Botanical gardens
Sacred groves
Wildlife safari parks
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA ?
UCCAUAGCGUA
ACCUAUGCGAU
UGGTUTCGCAT
AGGUAUCGCAU
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
Both sons and daughters
Only grandchildren
Only sons
Only daughters
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 a b c
i ii iii
ii iii i
i iii ii
iii ii i
All of the following are part of an operon except
a promoter
an enhancer
structural genes
an operator
According to Hugo de Vries, the mechanism of evolution is
Minor mutations
Phenotypic variations
Saltation
Multiple step mutations
Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively ?
Decreased respiratory surface; Inflammation of bronchioles
Increased respiratory surface; Inflammation of bronchioles
Increased number of bronchioles; Increased respiratory surface
Inflammation of bronchioles; Decreased respiratory surface
Match the items given in Column I with those in Column II:
| Column I | Column II |
| a. Tidal volume | i. 500 – 550 mL |
| b. Inspiratory Reserve volume | ii. 2500 – 3000 mL |
| c. Expiratory Reserve volume | iii. 1100 – 1200 mL |
| d. Residual volume | iv. 1000 – 1100 mL |
a b c d
iii ii i iv
i iv ii iii
iv iii ii i
iii i iv ii
Match the items given in Column I with those in Column II:
| 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 |
a b c d
ii iii i iv
iv i ii iii
i ii iii iv
iii ii iv i
Which of the following is an amino acid derived hormone ?
Estriol
Estradiol
Ecdysone
Epinephrine
Which of the following structures or regions is incorrectly paired with its function ?
Corpus callosum : band of fibers connecting left and right cerebral hemispheres. ACHLA/AA/Page 18 SPACE FOR ROUGH WORK English
Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.
Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
Medulla oblongata : controls respiration and cardiovascular reflexes.
Which of the following hormones can play a significant role in osteoporosis ?
Parathyroid hormone and Prolactin
Estrogen and Parathyroid hormone
Progesterone and Aldosterone
Aldosterone and Prolactin
The transparent lens in the human eye is held in its place by
smooth muscles attached to the ciliary body
smooth muscles attached to the iris
ligaments attached to the iris
ligaments attached to the ciliary body
Which of the following terms describe human dentition ?
Pleurodont, Diphyodont, Heterodont
Pleurodont, Monophyodont, Homodont
Thecodont, Diphyodont, Heterodont
Thecodont, Diphyodont, Homodont
Which of the following events does not occur in rough endoplasmic reticulum ?
Phospholipid synthesis
Cleavage of signal peptide
Protein glycosylation
Protein folding
Select the incorrect match :
Polytene – Oocytes of amphibians chromosomes
Submetacentric – L-shaped chromososmes chromosomes
Allosomes – Sex chromosomes
Lampbrush – Diplotene bivalents chromosomes
Nissl bodies are mainly composed of
Free ribosomes and RER
Nucleic acids and SER
DNA and RNA
Proteins and lipids
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
Nucleosome
Plastidome
Polyhedral bodies
Polysome
Which of these statements is incorrect ?
Oxidative phosphorylation takes place in outer mitochondrial membrane.
Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
Glycolysis occurs in cytosol.
Enzymes of TCA cycle are present in mitochondrial matrix.
Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system.
Osteichthyes
Aves
Reptilia
Amphibia
Ciliates differ from all other protozoans in
having two types of nuclei
using pseudopodia for capturing prey
having a contractile vacuole for removing excess water
using flagella for locomotion
Which of the following animals does not undergo metamorphosis ?
Starfish
Moth
Tunicate
Earthworm
Which of the following features is used to identify a male cockroach from a female cockroach ?
Presence of anal cerci
Forewings with darker tegmina
Presence of caudal styles
Presence of a boat shaped sternum on the 9 th abdominal segment
Which of the following organisms are known as chief producers in the oceans ?
Euglenoids ACHLA/AA/Page 19 SPACE FOR ROUGH WORK English
Cyanobacteria
Diatoms
Dinoflagellates
Which one of these animals is not a homeotherm ?
Psittacula
Camelus
Chelone
Macropus
Which of the following pairs is wrongly matched ?
T.H. Morgan : Linkage
XO type sex : Grasshopper determination
ABO blood grouping : Co-dominance
Starch synthesis in pea : Multiple alleles
Which of the following flowers only once in its life-time ?
Papaya
Mango
Jackfruit
Bamboo species
Select the correct match :
F 2 × Recessive parent – Dihybrid cross
Ribozyme – Nucleic acid
T.H. Morgan – Transduction
G. Mendel – Transformation
Select the correct statement :
Transduction was discovered by S. Altman.
Spliceosomes take part in translation.
Punnett square was developed by a British scientist.
Franklin S tahl coined the term ‘‘linkage’’.
Which of the following has proved helpful in preserving pollen as fossils ?
Sporopollenin ACHLA/AA/Page 15 SPACE FOR ROUGH WORK English
Oil content
Cellulosic intine
Pollenkitt
Offsets are produced by
Parthenogenesis
Parthenocarpy
Mitotic divisions
Meiotic divisions
The experimental proof for semiconservative replication of DNA was first shown in a
Virus
Plant
Bacterium
Fungus
Winged pollen grains are present in
Pinus
Mango
Cycas
Mustard
After karyogamy followed by meiosis, spores are produced exogenously in
Saccharomyces
Agaricus
Alternaria
Neurospora
Which one is wrongly matched ?
Unicellular organism – Chlorella ACHLA/AA/Page 17 SPACE FOR ROUGH WORK English
Gemma cups – Marchantia
Biflagellate zoospores – Brown algae
Uniflagellate gametes – Polysiphonia
Match the items given in Column I with those in Column II:
| Column I (Function) | Column II (Part of Excretory System) |
| a. Ultrafiltration | i. Henle’s loop |
| b. Concentration | ii. Ureter |
| of urine | |
| c. Transport of | iii. Urinary bladder |
| urine | |
| d. Storage of urine | iv. Malpighian corpuscle |
| v. Proximal convoluted tubule |
a b c d
v iv i ii
v iv i iii
iv i ii iii
iv v ii iii
In which of the following forms is iron absorbed by plants ?
Both ferric and ferrous ACHLA/AA/Page 14 SPACE FOR ROUGH WORK English
Free element
Ferrous
Ferric
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 ?
Viola
Banana
Yucca
Hydrilla
Oxygen is not produced during photosynthesis by
Chara
Cycas
Nostoc
Green sulphur bacteria
Which of the following elements is responsible for maintaining turgor in cells ?
Calcium
Potassium
Sodium
Magnesium
What is the role of NAD + in cellular respiration ?
It is the final electron acceptor for anaerobic respiration.
It is a nucleotide source for ATP synthesis.
It functions as an electron carrier.
It functions as an enzyme.
Double fertilization is
Syngamy and triple fusion
Fusion of two male gametes with one egg
Fusion of one male gamete with two polar nuclei
Fusion of two male gametes of a pollen tube with two different eggs
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
– 160 ° C
– 196 ° C
– 80 ° C
– 120 ° C
What type of ecological pyramid would be obtained with the following data ? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g
Upright pyramid of biomass
Upright pyramid of numbers
Pyramid of energy
Inverted pyramid of biomass
Natality refers to
Number of individuals entering a habitat
Number of individuals leaving the habitat
Birth rate
Death rate
Which of the following is a secondary pollutant ?
O 3
SO 2
CO 2
CO
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?
Oxygen
Fe
Cl
Carbon
Niche is
the functional role played by the organism where it lives
the range of temperature that the organism needs to live
the physical space where an organism lives
all the biological factors in the organism’s environment
World Ozone Day is celebrated on
22 nd April
16 th September
21 st April
5 th June
Which of the following statements is correct ?
Stems are usually unbranched in both Cyca s and Cedrus.
Horsetails are gymnosperms.
Selaginella is heterosporous, while Salvinia is homosporous.
Ovules are not enclosed by ovary wall in gymnosperms.
Secondary xylem and phloem in dicot stem are produced by
Axillary meristems
Phellogen
Vascular cambium
Apical meristems
Sweet potato is a modified
Rhizome
Tap root
Adventitious root
Stem
Pneumatophores occur in
Submerged hydrophytes
Carnivorous plants
Free-floating hydrophytes
Halophytes
Select the wrong statement :
Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
Pseudopodia are locomotory and feeding structures in Sporozoans.
Mushrooms belong to Basidiomycetes.
Cell wall is present in members of Fungi and Plantae.
Casparian strips occur in
Endodermis
Cortex
Pericycle
Epidermis
Plants having little or no secondary growth are
Cycads
Conifers
Deciduous angiosperms
Grasses
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
Basmati
Lerma Rojo
Sharbati Sonora
Co-667
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes ?
pBR 322
λ phage
Ti plasmid
Retrovirus
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
Bioexploitation
Biodegradation
Biopiracy
Bio-infringement
Select the correct match :
Matthew Meselson – Pisum sativum and F. Stahl
Alec Jeffreys – Streptococcus pneumoniae
Alfred Hershey and – TMV Martha Chase
Francois Jacob and – Lac operon Jacques Monod
The correct order of steps in Polymerase Chain Reaction (PCR) is
Denaturation, Annealing, Extension
Denaturation, Extension, Annealing
Annealing, Extension, Denaturation
Extension, Denaturation, Annealing
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
Genetic Engineering Appraisal Committee (GEAC)
Research Committee on Genetic Manipulation (RCGM)
Council for Scientific and Industrial Research (CSIR)
Indian Council of Medical Research (ICMR)
The stage during which separation of the paired homologous chromosomes begins is
Zygotene
Diakinesis
Diplotene
Pachytene
The Golgi complex participates in
Activation of amino acid
Respiration in bacteria
Formation of secretory vesicles
Fatty acid breakdown
Stomatal movement is not affected by
CO 2 concentration
O 2 concentration
Light
Temperature
The two functional groups characteristic of sugars are
carbonyl and hydroxyl
carbonyl and phosphate
carbonyl and methyl
hydroxyl and methyl
Which of the following is not a product of light reaction of photosynthesis ?
Oxygen
NADPH
NADH
ATP
Stomata in grass leaf are
Barrel shaped ACHLA/AA/Page 16 SPACE FOR ROUGH WORK English
Rectangular
Kidney shaped
Dumb-bell shaped
Which of the following is true for nucleolus ?
It is a site for active ribosomal RNA synthesis.
It takes part in spindle formation.
It is a membrane-bound structure.
Larger nucleoli are present in dividing cells.
Which among the following is not a prokaryote ?
Oscillatoria
Nostoc
Mycobacterium
Saccharomyces
On which of the following properties does the coagulating power of an ion depend ?
The sign of charge on the ion alone
Both magnitude and sign of the charge on the ion
Size of the ion alone
The magnitude of the charge on the ion alone
The solubility of BaSO 4 in water is 2·42 × 10 – 3 gL – 1 at 298 K. The value of its solubility product (K sp ) will be (Given molar mass of BaSO 4 = 233 g mol – 1 )
1·08 × 10 – 8 mol 2 L – 2 ACHLA/AA/Page 12 SPACE FOR ROUGH WORK English
1·08 × 10 – 14 mol 2 L – 2
1·08 × 10 – 12 mol 2 L – 2
1·08 × 10 – 10 mol 2 L – 2
Given van der Waals constant for NH 3 , H 2 , O 2 and CO 2 are respectively 4·17, 0·244, 1·36 and 3·59, which one of the following gases is most easily liquefied ?
CO 2
O 2
H 2
NH 3
Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : a. 60 mL 10 M HCl + 40 mL 10 M NaOH b. 55 mL 10 M HCl + 45 mL 10 M NaOH c. 75 mL 5 M HCl + 25 mL 5 M NaOH d. 100 mL 10 M HCl + 100 mL 10 M NaOH pH of which one of them will be equal to 1 ?
c
d
a
b
Which one of the following elements is unable to form – 3 6 MF ion ?
In
B
Al
Ga
Which of the following statements is not true for halogens ?
Chlorine has the highest electron-gain enthalpy.
All but fluorine show positive oxidation states.
All are oxidizing agents.
All form monobasic oxyacids.
In the structure of ClF 3 , the number of lone pairs of electrons on central atom ‘Cl’ is
three
four
two
one
Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?
Cu
Mg
Zn
Fe
The correct order of N-compounds in its decreasing order of oxidation states is
NH 4 Cl, N 2 , NO, HNO 3
HNO 3 , NH 4 Cl, NO, N 2
HNO 3 , NO, NH 4 Cl, N 2
HNO 3 , NO, N 2 , NH 4 Cl
The correct order of atomic radii in group 13 elements is
B < Ga < Al < In < Tl
B < Ga < Al < Tl < In
B < Al < Ga < In < Tl
B < Al < In < Ga < Tl
The compound A on treatment with Na gives B, and with PCl 5 gives C. B and C react together to give diethyl ether. A, B and C are in the order
C 2 H 5 OH, C 2 H 5 ONa, C 2 H 5 Cl
C 2 H 5 Cl, C 2 H 6 , C 2 H 5 OH
C 2 H 5 OH, C 2 H 5 Cl, C 2 H 5 ONa
C 2 H 5 OH, C 2 H 6 , C 2 H 5 Cl
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
CH 4 ACHLA/AA/Page 10 SPACE FOR ROUGH WORK English
CH 3 – CH 3
CH 2 = CH 2
CH ≡ CH
The compound C 7 H 8 undergoes the following reactions : The product ‘C’ is
p -bromotoluene
3-bromo-2,4,6-trichlorotoluene
o -bromotoluene
m -bromotoluene
Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ?
NO
N 2 O
NO 2
N 2 O 5
The type of isomerism shown by the complex [CoCl 2 (en) 2 ] is
Linkage isomerism
Ionization isomerism
Coordination isomerism
Geometrical isomerism
Which one of the following ions exhibits d-d transition and paramagnetism as well ?
– 2 4 MnO
– 4 MnO
– 2 7 2 O Cr
– 2 4 CrO
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. 8 B.M. |
| b. Cr³⁺ | ii. 3.5 B.M. |
| c. Fe³⁺ | iii. 3 B.M. |
| d. Ni²⁺ | iv. 2.4 B.M. |
| v. 1.5 B.M. |
a b c d
iii v i ii
iv i ii iii
i ii iii iv
iv v ii i
Iron carbonyl, Fe(CO) 5 is
dinuclear
trinuclear
mononuclear
tetranuclear
The geometry and magnetic behaviour of the complex [Ni(CO) 4 ] are
tetrahedral geometry and paramagnetic
square planar geometry and paramagnetic
tetrahedral geometry and diamagnetic
square planar geometry and diamagnetic
In the reaction the electrophile involved is
dichlorocarbene ( : CCl 2 )
dichloromethyl anion ( )
formyl cation ( ⊕ CHO )
dichloromethyl cation ( ⊕ 2 CHCl )
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
formation of intermolecular H-bonding
more extensive association of carboxylic acid via van der Waals force of attraction
formation of carboxylate ion
formation of intramolecular H-bonding
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
remains unchanged
is tripled
is doubled
is halved
The correction factor ‘a’ to the ideal gas equation corresponds to
forces of attraction between the gas molecules ACHLA/AA/Page 13 SPACE FOR ROUGH WORK English
electric field present between the gas molecules
volume of the gas molecules
density of the gas molecules
For the redox reaction Mn – 4 O + C 2 – 2 4 O + H + ⎯→ ⎯ Mn 2+ + CO 2 + H 2 O the correct coefficients of the reactants for the balanced equation are Mn – 4 O – 2 4 2 O C H +
5 16 2
2 16 5
2 5 16
16 5 2
Which one of the following conditions will favour maximum formation of the product in the reaction, A 2 (g) + B 2 (g) λ X 2 (g) Δ r H = – X kJ ?
High temperature and low pressure
High temperature and high pressure
Low temperature and low pressure
Low temperature and high pressure
A mixture of 2·3 g formic acid and 4·5 g oxalic acid is treated with conc. H 2 SO 4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be
4·4
2·8
3·0
1·4
The difference between amylose and amylopectin is
Amylose is made up of glucose and galactose
Amylopectin have 1 → 4 α -linkage and 1 → 6 β -linkage
Amylose have 1 → 4 α -linkage and 1 → 6 β -linkage
Amylopectin have 1 → 4 α -linkage and 1 → 6 α -linkage
Which of the following oxides is most acidic in nature ?
CaO
BaO
BeO
MgO
Regarding cross-linked or network polymers, which of the following statements is incorrect ?
They contain strong covalent bonds in their polymer chains.
Examples are bakelite and melamine.
They are formed from bi- and tri-functional monomers.
They contain covalent bonds between various linear polymer chains.
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
In acidic (strong) medium aniline is present as anilinium ion.
In absence of substituents nitro group always goes to m-position.
In electrophilic substitution reactions amino group is meta directive.
In spite of substituents nitro group always goes to only m-position.
Which of the following molecules represents the order of hybridisation sp 2 , sp 2 , sp, sp from left to right atoms ?
CH 3 – CH = CH – CH 3
CH 2 = CH – CH = CH 2
CH 2 = CH – C ≡ CH
HC ≡ C – C ≡ CH
Which of the following is correct with respect to – I effect of the substituents ? (R = alkyl)
– NR 2 < – OR < – F
– NH 2 > – OR > – F
– NR 2 > – OR > – F
– NH 2 < – OR < – F
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s 2 2s 2 2p 3 , the simplest formula for this compound is
Mg 3 X 2
Mg 2 X
MgX 2
Mg 2 X 3
Iron exhibits bcc structure at room temperature. Above 900 ° C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 ° C (assuming molar mass and atomic radii of iron remains constant with temperature) is
2 1
2 4 3 3
2 3 3 4
2 3
Which one is a wrong statement ?
The value of m for 2 z d is zero.
The electronic configuration of N atom is
An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers.
Total orbital angular momentum of electron in ‘s’ orbital is equal to zero.
Consider the following species : CN + , CN – , NO and CN Which one of these will have the highest bond order ?
CN +
CN –
CN
NO
Which of the following compounds can form a zwitterion ?
Glycine ACHLA/AA/Page 9 SPACE FOR ROUGH WORK English
Benzoic acid
Acetanilide
Aniline
The correct difference between first- and second-order reactions is that
the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
a first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed
the half-life of a first-order reaction does not depend on [A] 0 ; the half-life of a second-order reaction does depend on [A] 0
the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
Among CaH 2 , BeH 2 , BaH 2 , the order of ionic character is
BaH 2 < BeH 2 < CaH 2
BeH 2 < BaH 2 < CaH 2
CaH 2 < BeH 2 < BaH 2
BeH 2 < CaH 2 < BaH 2
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : Then the species undergoing disproportionation is
HBrO
Br 2
Br – 4 O
Br – 3 O
In which case is the number of molecules of water maximum ?
10 – 3 mol of water
0·00224 L of water vapours at 1 atm and 273 K
0·18 g of water
18 mL of water
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Source: National Testing Agency (NTA), NEET-UG 2018 Question Paper, Code SS. Solutions written for educational use, NCERT-aligned. Verify your answers against the official NTA answer key.