Official NTA NEET-UG 2018 question paper, set NN. 174 questions across Physics, Chemistry, and Biology with worked solutions and the official answer key.
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
0·138 H
1·389 H
138·88 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 away from the mirror
30 cm towards the mirror
36 cm away from the mirror
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
+ z direction
– y direction
– z direction
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
60 °
30 °
45 °
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 = 40 μ A, I C = 10 mA, β = 250
I B = 20 μ A, I C = 5 mA, β = 250
I B = 25 μ A, I C = 5 mA, β = 200
In a p-n junction diode, change in temperature due to heating
affects the overall V – I characteristics of p-n junction
affects only reverse resistance
does not affect resistance of p-n junction
affects only forward 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 +
B A . + A . B
A . – B + – A . B
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
9 F
4 F
6 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
104·3 J
42·2 J
208·7 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 3
r 5
r 2
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
1 : 2
4 : 1
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
15
20
30
10
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 t mV eE 1 0 0 0
λ 0 t
λ 0 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + t mV eE 1 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
1 : 1
2 : – 1
1 : – 1
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
330 m/s
350 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
inversely proportional to the distance between the plates.
independent of the distance between the plates.
proportional to the square root of the distance between the plates.
linearly proportional to 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
2 π s
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
smaller
10 times greater
5 times greater
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
2 : 5
7 : 10
10 : 7
5 : 7
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.
Raindrops will fall faster.
Time period of a simple pendulum on the Earth would decrease.
Walking on the ground would become more difficult.
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
Angular velocity
Rotational kinetic energy
Moment of inertia
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
7·14 A
14·76 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
1·13 W
0·79 W
2·74 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 induced electric field due to the changing magnetic field
the current source
the lattice structure of the material of the rod
the magnetic field
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
40 Ω
250 Ω
25 Ω
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
5 2
3 1
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
16 cm
13·2 cm
12·5 cm
8 cm
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
12·5%
26·8%
6·25%
20%
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
2·508 × 10 4 K
5·016 × 10 4 K
8·360 × 10 4 K
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
Reflected light is polarised with its electric vector parallel to the plane of incidence
i = sin – 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
1·7 mm
1·8 mm
2·1 mm
1·9 mm
An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
small focal length and small diameter
small focal length and large diameter
large focal length and large diameter
large focal length and small diameter
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
2 3 D
5 7 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 A > W C > W B
W C > W B > W A
W B > W A > W C
W A > W B > W C
Which one of the following statements is incorrect ?
Coefficient of sliding friction has dimensions of length.
Rolling friction is smaller than sliding friction.
Frictional force opposes the relative motion.
Limiting value of static friction is directly proportional to normal reaction.
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
0·5
0·8
0·25
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
Violet – Yellow – Orange – Silver
Yellow – Green – 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
9
10
20
11
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
2 m/s, 4 m/s
1 m/s, 3·5 m/s
1 m/s, 3 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 = θ ec cos g
a = g cos θ
a = θ sin 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
0·521 cm
0·053 cm
0·525 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
– 8 ^ i – 4 ^ j – 7 ^ k
– 7 ^ i – 8 ^ j – 4 ^ k
– 4 ^ i – ^ j – 8 ^ k
Which of the following hormones can play a significant role in osteoporosis ?
Parathyroid hormone and Prolactin
Aldosterone and Prolactin
Estrogen and Parathyroid hormone
Progesterone and Aldosterone
Which of the following is an amino acid derived hormone ?
Estriol
Epinephrine
Estradiol
Ecdysone
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
Medulla oblongata : controls respiration and cardiovascular reflexes.
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.
The transparent lens in the human eye is held in its place by
smooth muscles attached to the ciliary body
ligaments attached to the ciliary body
smooth muscles attached to the iris
ligaments attached to the iris
The amnion of mammalian embryo is derived from
ectoderm and endoderm
ectoderm and mesoderm
mesoderm and trophoblast
endoderm and mesoderm
Hormones secreted by the placenta to maintain pregnancy are
hCG, progestogens, estrogens, glucocorticoids
hCG, hPL, progestogens, prolactin
hCG, hPL, progestogens, estrogens
hCG, hPL, estrogens, relaxin, oxytocin
The contraceptive ‘SAHELI’
is a post-coital contraceptive.
blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
is an IUD.
increases the concentration of estrogen and prevents ovulation in females.
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 spermatids are formed, while in spermiation spermatozoa are formed.
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.
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
Both sons and daughters
Only daughters
Only grandchildren
Only sons
According to Hugo de Vries, the mechanism of evolution is
Minor mutations
Multiple step mutations
Phenotypic variations
Saltation
All of the following are part of an operon except
a promoter
an operator
an enhancer
structural genes
AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA ?
UCCAUAGCGUA
AGGUAUCGCAU
ACCUAUGCGAU
UGGTUTCGCAT
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
ii iv iii i
iii iv i ii
iii ii i iv
i iv iii ii
In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels ?
Amoebiasis
Elephantiasis
Ringworm disease
Ascariasis
Among the following sets of examples for divergent evolution, select the incorrect option :
Eye of octopus, bat and man
Forelimbs of man, bat and cheetah
Brain of bat, man and cheetah
Heart of bat, man and cheetah
The similarity of bone structure in the forelimbs of many vertebrates is an example of
Adaptive radiation
Homology
Convergent evolution
Analogy
Which of the following is not an autoimmune disease ?
Vitiligo
Psoriasis
A lzheimer’s disease
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
a, c and e
b, c and e
b, d and e
a, b and c
Conversion of milk to curd improves its nutritional value by increasing the amount of
Vitamin E
Vitamin D
Vitamin B 12
Vitamin A
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
i iii ii
ii i iii
i ii iii
iii i ii
Which one of the following population interactions is widely used in medical science for the production of antibiotics ?
Amensalism
Commensalism
Parasitism
Mutualism
All of the following are included in ‘Ex -situ conservation’ except
Seed banks
Wildlife safari parks
Botanical gardens
Sacred groves
In a growing population of a country,
pre-reproductive individuals are less than the reproductive individuals.
pre-reproductive individuals are more than the reproductive individuals.
reproductive and pre-reproductive individuals are equal in number.
reproductive individuals are less than the post-reproductive individuals.
Which part of poppy plant is used to obtain the drug ‘‘Smack’’ ?
Leaves
Flowers
Roots
Latex
Which of the following gastric cells indirectly help in erythropoiesis ?
Parietal cells
Chief cells
Goblet cells
Mucous 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
iii iv i ii
i iii iv ii
i ii iv iii
Which of the following is an occupational respiratory disorder ?
Emphysema
Anthracis
Botulism
Silicosis
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
binds to troponin to remove the masking of active sites on actin for myosin.
detaches the myosin head from the actin filament.
activates the myosin ATPase by binding to it.
Nissl bodies are mainly composed of
Free ribosomes and RER
Proteins and lipids
Nucleic acids and SER
DNA and RNA
Which of these statements is incorrect ?
Oxidative phosphorylation takes place in outer mitochondrial membrane.
Enzymes of TCA cycle are present in mitochondrial matrix.
Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
Glycolysis occurs in cytosol.
Select the incorrect match :
Polytene – Oocytes of amphibians chromosomes
Lampbrush – Diplotene bivalents chromosomes
Submetacentric – L-shaped chromososmes chromosomes
Allosomes – Sex chromosomes
Which of the following terms describe human dentition ?
Pleurodont, Diphyodont, Heterodont
Thecodont, Diphyodont, Homodont
Pleurodont, Monophyodont, Homodont
Thecodont, Diphyodont, Heterodont
Which of the following events does not occur in rough endoplasmic reticulum ?
Phospholipid synthesis
Protein folding
Cleavage of signal peptide
Protein glycosylation
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
Nucleosome
Polysome
Plastidome
Polyhedral bodies
Ciliates differ from all other protozoans in
having two types of nuclei
using flagella for locomotion
using pseudopodia for capturing prey
having a contractile vacuole for removing excess water
Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system.
Osteichthyes
Amphibia
Aves
Reptilia
Which one of these animals is not a homeotherm ?
Psittacula
Macropus
Camelus
Chelone
Which of the following features is used to identify a male cockroach from a female cockroach ?
Presence of anal cerci
Presence of a boat shaped sternum on the 9 th abdominal segment
Forewings with darker tegmina
Presence of caudal styles
Which of the following animals does not undergo metamorphosis ?
Starfish
Earthworm
Moth
Tunicate
Which of the following organisms are known as chief producers in the oceans ?
Diatoms
Dinoflagellates
Cyanobacteria
Euglenoids ACHLA/AA/Page 19 SPACE FOR ROUGH WORK English
Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively ?
Decreased respiratory surface; Inflammation of bronchioles
Inflammation of bronchioles; Decreased respiratory surface
Increased respiratory surface; Inflammation of bronchioles
Increased number of bronchioles; Increased respiratory surface
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
ii iii i
i 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. Fibrinogen i. Osmotic balance b. Globulin ii. Blood clotting c. Albumin iii. Defence mechanism a b c
i iii ii
iii ii i
i ii iii
ii iii i
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
iv iii ii i
iii i iv ii
iii ii i iv
i iv ii iii
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
i ii iii iv
iv i ii iii
ii iii i iv
iii ii iv i
Secondary xylem and phloem in dicot stem are produced by
Axillary meristems
Apical meristems
Phellogen
Vascular cambium
Pneumatophores occur in
Submerged hydrophytes
Halophytes
Carnivorous plants
Free-floating hydrophytes
Plants having little or no secondary growth are
Cycads
Grasses
Conifers
Deciduous angiosperms
Select the wrong statement :
Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
Cell wall is present in members of Fungi and Plantae.
Pseudopodia are locomotory and feeding structures in Sporozoans.
Mushrooms belong to Basidiomycetes.
Casparian strips occur in
Endodermis
Epidermis
Cortex
Pericycle
Sweet potato is a modified
Rhizome
Stem
Tap root
Adventitious root
Which of the following statements is correct ?
Stems are usually unbranched in both Cyca s and Cedrus.
Ovules are not enclosed by ovary wall in gymnosperms.
Horsetails are gymnosperms.
Selaginella is heterosporous, while Salvinia is homosporous.
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
Inverted pyramid of biomass
Upright pyramid of numbers
Pyramid of energy
World Ozone Day is celebrated on
22 nd April
5 th June
16 th September
21 st April
In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?
Oxygen
Carbon
Fe
Cl
Natality refers to
Number of individuals entering a habitat
Death rate
Number of individuals leaving the habitat
Birth rate
Niche is
the functional role played by the organism where it lives
all the biological factors in the organism’s environment
the range of temperature that the organism needs to live
the physical space where an organism lives
Which of the following is a secondary pollutant ?
O 3
CO
SO 2
CO 2
Winged pollen grains are present in
Pinus
Mustard
Mango
Cycas
After karyogamy followed by meiosis, spores are produced exogenously in
Saccharomyces
Neurospora
Agaricus
Alternaria
Which one is wrongly matched ?
Unicellular organism – Chlorella ACHLA/AA/Page 17 SPACE FOR ROUGH WORK English
Uniflagellate gametes – Polysiphonia
Gemma cups – Marchantia
Biflagellate zoospores – Brown algae
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
iv i ii iii
v iv i iii
iv v ii iii
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
Hydrilla
Banana
Yucca
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
– 160 ° C
– 120 ° C
– 196 ° C
– 80 ° C
In which of the following forms is iron absorbed by plants ?
Both ferric and ferrous ACHLA/AA/Page 14 SPACE FOR ROUGH WORK English
Ferric
Free element
Ferrous
Which of the following elements is responsible for maintaining turgor in cells ?
Calcium
Magnesium
Potassium
Sodium
Double fertilization is
Syngamy and triple fusion
Fusion of two male gametes of a pollen tube with two different eggs
Fusion of two male gametes with one egg
Fusion of one male gamete with two polar nuclei
What is the role of NAD + in cellular respiration ?
It is the final electron acceptor for anaerobic respiration.
It functions as an enzyme.
It is a nucleotide source for ATP synthesis.
It functions as an electron carrier.
Oxygen is not produced during photosynthesis by
Chara
Green sulphur bacteria
Cycas
Nostoc
The Golgi complex participates in
Activation of amino acid
Fatty acid breakdown
Respiration in bacteria
Formation of secretory vesicles
Stomatal movement is not affected by
CO 2 concentration
Temperature
O 2 concentration
Light
Stomata in grass leaf are
Barrel shaped ACHLA/AA/Page 16 SPACE FOR ROUGH WORK English
Dumb-bell shaped
Rectangular
Kidney shaped
Which of the following is true for nucleolus ?
It is a site for active ribosomal RNA synthesis.
Larger nucleoli are present in dividing cells.
It takes part in spindle formation.
It is a membrane-bound structure.
Which of the following is not a product of light reaction of photosynthesis ?
Oxygen
ATP
NADPH
NADH
The stage during which separation of the paired homologous chromosomes begins is
Zygotene
Pachytene
Diakinesis
Diplotene
The two functional groups characteristic of sugars are
carbonyl and hydroxyl
hydroxyl and methyl
carbonyl and phosphate
carbonyl and methyl
Which among the following is not a prokaryote ?
Oscillatoria
Saccharomyces
Nostoc
Mycobacterium
Offsets are produced by
Parthenogenesis
Meiotic divisions
Parthenocarpy
Mitotic divisions
Select the correct statement :
Transduction was discovered by S. Altman.
Franklin S tahl coined the term ‘‘linkage’’.
Spliceosomes take part in translation.
Punnett square was developed by a British scientist.
Which of the following has proved helpful in preserving pollen as fossils ?
Sporopollenin ACHLA/AA/Page 15 SPACE FOR ROUGH WORK English
Pollenkitt
Oil content
Cellulosic intine
Which of the following pairs is wrongly matched ?
T.H. Morgan : Linkage
Starch synthesis in pea : Multiple alleles
XO type sex : Grasshopper determination
ABO blood grouping : Co-dominance
Select the correct match :
F 2 × Recessive parent – Dihybrid cross
G. Mendel – Transformation
Ribozyme – Nucleic acid
T.H. Morgan – Transduction
Which of the following flowers only once in its life-time ?
Papaya
Bamboo species
Mango
Jackfruit
The experimental proof for semiconservative replication of DNA was first shown in a
Virus
Fungus
Plant
Bacterium
Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes ?
pBR 322
Retrovirus
λ phage
Ti plasmid
Select the correct match :
Matthew Meselson – Pisum sativum and F. Stahl
Francois Jacob and – Lac operon Jacques Monod
Alec Jeffreys – Streptococcus pneumoniae
Alfred Hershey and – TMV Martha Chase
Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
Bioexploitation
Bio-infringement
Biodegradation
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
Basmati
Co-667
Lerma Rojo
Sharbati Sonora
In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
Genetic Engineering Appraisal Committee (GEAC)
Indian Council of Medical Research (ICMR)
Research Committee on Genetic Manipulation (RCGM)
Council for Scientific and Industrial Research (CSIR)
The correct order of steps in Polymerase Chain Reaction (PCR) is
Denaturation, Annealing, Extension
Extension, Denaturation, Annealing
Denaturation, Extension, Annealing
Annealing, Extension, Denaturation
Which of the following compounds can form a zwitterion ?
Acetanilide
Aniline
Benzoic acid
Glycine ACHLA/AA/Page 9 SPACE FOR ROUGH WORK English
The geometry and magnetic behaviour of the complex [Ni(CO) 4 ] are
tetrahedral geometry and paramagnetic
square planar geometry and diamagnetic
square planar geometry and paramagnetic
tetrahedral geometry and diamagnetic
Iron carbonyl, Fe(CO) 5 is
dinuclear
tetranuclear
trinuclear
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
iii v i ii
iv v ii i
iv i ii iii
i ii iii iv
The type of isomerism shown by the complex [CoCl 2 (en) 2 ] is
Linkage isomerism
Geometrical isomerism
Ionization isomerism
Coordination isomerism
Which one of the following ions exhibits d-d transition and paramagnetism as well ?
– 2 4 MnO
– 2 4 CrO
– 4 MnO
– 2 7 2 O Cr
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
HC ≡ C – C ≡ CH
CH 2 = CH – CH = CH 2
CH 2 = CH – 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
– NH 2 < – OR < – F
– NR 2 < – OR < – F
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 – 10 mol 2 L – 2
1·08 × 10 – 14 mol 2 L – 2
1·08 × 10 – 12 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
NH 3
O 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 ?
c
b
d
a
On which of the following properties does the coagulating power of an ion depend ?
The sign of charge on the ion alone
The magnitude of the charge on the ion alone
Both magnitude and sign of the charge on the ion
Size of the ion alone
Which of the following statements is not true for halogens ?
Chlorine has the highest electron-gain enthalpy.
All form monobasic oxyacids.
All but fluorine show positive oxidation states.
All are oxidizing agents.
Considering Ellingham diagram, which of the following metals can be used to reduce alumina ?
Cu
Fe
Mg
Zn
The correct order of atomic radii in group 13 elements is
B < Ga < Al < In < Tl
B < Al < In < Ga < Tl
B < Ga < Al < Tl < In
B < Al < Ga < In < Tl
In the structure of ClF 3 , the number of lone pairs of electrons on central atom ‘Cl’ is
three
one
four
two
The correct order of N-compounds in its decreasing order of oxidation states is
NH 4 Cl, N 2 , NO, HNO 3
HNO 3 , NO, N 2 , NH 4 Cl
HNO 3 , NH 4 Cl, NO, N 2
HNO 3 , NO, NH 4 Cl, N 2
Which one of the following elements is unable to form – 3 6 MF ion ?
In
Ga
B
Al
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 OH, C 2 H 6 , 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
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 ≡ CH
CH 3 – CH 3
CH 2 = CH 2
The compound C 7 H 8 undergoes the following reactions : The product ‘C’ is
p -bromotoluene
m -bromotoluene
3-bromo-2,4,6-trichlorotoluene
o -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 5
N 2 O
NO 2
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
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
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
Among CaH 2 , BeH 2 , BaH 2 , the order of ionic character is
BaH 2 < BeH 2 < CaH 2
BeH 2 < CaH 2 < BaH 2
BeH 2 < BaH 2 < CaH 2
CaH 2 < BeH 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 – 3 O
Br 2
Br – 4 O
In which case is the number of molecules of water maximum ?
10 – 3 mol of water
18 mL of water
0·00224 L of water vapours at 1 atm and 273 K
0·18 g of water
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
formation of intramolecular H-bonding
more extensive association of carboxylic acid via van der Waals force of attraction
formation of carboxylate ion
In the reaction the electrophile involved is
dichlorocarbene ( : CCl 2 )
dichloromethyl cation ( ⊕ 2 CHCl )
dichloromethyl anion ( )
formyl cation ( ⊕ CHO )
When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
remains unchanged
is halved
is tripled
is doubled
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
density of the gas molecules
electric field present between the gas molecules
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 low pressure
Low temperature and high pressure
High temperature and high pressure
Low temperature and low pressure
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
16 5 2
2 16 5
2 5 16
Regarding cross-linked or network polymers, which of the following statements is incorrect ?
They contain strong covalent bonds in their polymer chains.
They contain covalent bonds between various linear polymer chains.
Examples are bakelite and melamine.
They are formed from bi- and tri-functional monomers.
Nitration of aniline in strong acidic medium also gives m-nitroaniline because
In acidic (strong) medium aniline is present as anilinium ion.
In spite of substituents nitro group always goes to only m-position.
In absence of substituents nitro group always goes to m-position.
In electrophilic substitution reactions amino group is meta directive.
Which of the following oxides is most acidic in nature ?
CaO
MgO
BaO
BeO
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
Amylopectin have 1 → 4 α -linkage and 1 → 6 α -linkage
Amylose have 1 → 4 α -linkage and 1 → 6 β -linkage
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
1·4
2·8
3·0
Which one is a wrong statement ?
The value of m for 2 z d is zero.
Total orbital angular momentum of electron in ‘s’ orbital is equal to 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.
Consider the following species : CN + , CN – , NO and CN Which one of these will have the highest bond order ?
CN +
NO
CN –
CN
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 3
Mg 2 X
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 1
2 3
2 4 3 3
2 3 3 4
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Source: National Testing Agency (NTA), NEET-UG 2018 Question Paper, Code NN. Solutions written for educational use, NCERT-aligned. Verify your answers against the official NTA answer key.