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