NEET 2020 questions
170 questions, by subject. Each opens with its options and answer.
Zoology
- Name the enzyme that facilitates opening of DNA helix during transcription.
Biomolecules
- Identify the wrong statement with reference to transport of oxygen
Breathing and Exchange of Gases
- Identify the correct statement with regard to G1 phase (Gap 1) of interphase.
Biomolecules
- Match the following diseases with the causative organism and select the correct option. Column-I Column-II (a) Typhoid (i) Wuchereria (b) Pneumonia (ii) Plasmodium (c) Filariasis (iii) Salmonella (d) Malaria (iv)…
Human Health and Disease
- Meiotic division of the secondary oocyte is completed
Human Reproduction
- By which method was a new breed 'Hisardale' of sheep formed by using Bikaneri ewes and Marino rams?
Animal Husbandry
- Choose the correct pair from the following
Animal Kingdom
- The infectious stage of Plasmodium that enters the human body is
Human Health and Disease
- Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases
Breathing and Exchange of Gases
- The QRS complex in a standard ECG represents
Body Fluids and Circulation
- Which of the following statements is not correct?
Biomolecules
- Select the correct statement.
Biomolecules
- Match the following columns and select the correct option. Column-I Column-II (a) 6-15 pairs of gill slits (i) Trygon (b) Heterocercal caudal fin (ii) Cyclostomes (c) Air Bladder (iii) Chondrichthyes (d) Poison sting…
Animal Kingdom
- Cuboidal epithelium with brush border of microvilli is found in
Structural Organisation in Animals
- Match the following columns and select the correct option. Column-I Column-II (a) Bt cotton (i) Gene therapy (b) Adenosine deaminase deficiency (ii) Cellular defence (c) RNAi (iii) Detection of HIV infection (d) PCR…
Biomolecules
- Which one of the following is the most abundant protein in the animals?
Biomolecules
- If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10^9 bp, then the length of the DNA is approximately
Biomolecules
- The first phase of translation is
Biomolecules
- Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?
Human Reproduction
- Flippers of Penguins and Dolphins are examples of
Evolution
- Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.
Body Fluids and Circulation
- Select the option including all sexually transmitted diseases.
Reproductive Health
- Match the following columns and select the correct option. Column - I Column - II (a) Eosinophils (i) Immune response (b) Basophils (ii) Phagocytosis (c) Neutrophils (iii) Release histaminase, destructive enzymes (d)…
Body Fluids and Circulation
- Embryological support for evolution was disapproved by
Evolution
- Bilaterally symmetrical and acoelomate animals are exemplified by
Animal Kingdom
- Which of the following would help in prevention of diuresis?
Excretory Products and Elimination
- Some dividing cells exit the cell cycle and enter vegetative inactive stage. This is called quiescent stage (G_0). This process occurs at the end of
Human Reproduction
- In which of the following techniques, the embryos are transferred to assist those females who cannot conceive?
Reproductive Health
- Which of the following statements are true for the phylum-Chordata? (a) In Urochordata notochord extends from head to tail and it is present throughout their life. (b) In Vertebrata notochord is present during the…
Animal Kingdom
- Snow-blindness in Antarctic region is due to
Neural Control and Coordination
- Match the following columns and select the correct option. Column-I Column-II (a) Pituitary gland (i) Grave's disease (b) Thyroid gland (ii) Diabetes mellitus (c) Adrenal gland (iii) Diabetes insipidus (d) Pancreas (iv)…
Chemical Coordination and Integration
- Which of the following statements is correct?
Biomolecules
- From his experiments, S.L. Miller produced amino acids by mixing the following in a closed flask
Evolution
- Experimental verification of the chromosomal theory of inheritance was done by
Evolution
- Identify the correct statement with reference to human digestive system.
Digestion and Absorption
- Dissolution of the synaptonemal complex occurs during
Human Reproduction
- Select the correct match
Animal Kingdom
- Identify the substances having glycosidic bond and peptide bond, respectively in their structure
Biomolecules
- Match the following columns and select the correct option. Column-I Column-II (a) Organ of Corti (i) Connects middle ear and pharynx (b) Cochlea (ii) Coiled part of the labyrinth (c) Eustachian tube (iii) Attached to…
Neural Control and Coordination
- Identify the wrong statement with reference to immunity.
Human Health and Disease
- Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?
Biomolecules
- Goblet cells of alimentary canal are modified from
Structural Organisation in Animals
- Match the following columns and select the correct option. Column-I Column-II (a) Placenta (i) Androgens (b) Zona pellucida (ii) Human Chorionic Gonadotropin (hCG) (c) Bulbo-urethral glands (iii) Layer of the ovum (d)…
Human Reproduction
- The enzyme enterokinase helps in conversion of
Digestion and Absorption
- Match the following columns and select the correct option. Column-I Column-II (a) Gregarious, polyphagous pest (i) Asterias (b) Adult with radial symmetry and larva with bilateral symmetry (ii) Scorpion (c) Book lungs…
Animal Kingdom
- Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?
Excretory Products and Elimination
- Match the following columns and select the correct option. Column-I Column-II (a) Floating Ribs (i) Located between second and seventh ribs (b) Acromion (ii) Head of the Humerus (c) Scapula (iii) Clavicle (d) Glenoid…
Locomotion and Movement
- If the head of cockroach is removed, it may live for few days because
Neural Control and Coordination
- Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action? (a) Darwin's Finches of Galapagos islands. (b) Herbicide resistant…
Evolution
- Identify the basic amino acid from the following.
Biomolecules
- In gel electrophoresis, separated DNA fragments can be visualized with the help of
Biomolecules
Botany
- Match the organism with its use in biotechnology. Organism Use (a) *Bacillus thuringiensis* (i) Cloning vector (b) *Thermus aquaticus* (ii) Construction of first rDNA molecule (c) *Agrobacterium tumefaciens* (iii) DNA…
Biotechnology
- Match the following List-I List-II (a) Inhibitor of catalytic activity (i) Ricin (b) Possess peptide bonds (ii) Malonate (c) Cell wall material in fungi (iii) Chitin (d) Secondary metabolite (iv) Collagen Choose the…
Cell Structure and Function
- The plant parts which consist of two generations - one within the other (a) Pollen grains inside the anther (b) Germinated pollen grain with two male gametes (c) Seed inside the fruit (d) Embryo sac inside the ovule
Sexual Reproduction in Flowering Plants
- The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of
Photosynthesis
- In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
Ecosystem
- The product(s) of reaction catalyzed by nitrogenase in root nodules of leguminous plants is/are
Mineral Nutrition
- Identify the incorrect statement.
Biotechnology
- Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to
Biotechnology
- Which of the following pairs is of unicellular algae?
Plant Kingdom
- Strobili or cones are found in
Plant Kingdom
- Which of the following statements about inclusion bodies is incorrect?
Cell Structure and Function
- The number of substrate level phosphorylations in one turn of citric acid cycle is
Respiration in Plants
- Which of the following is not an attribute of a population?
Organisms and Populations
- According to Robert May, the global species diversity is about
Biodiversity and Conservation
- The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath (b) Large conspicuous parenchymatous ground tissue (c) Vascular bundles…
Anatomy of Flowering Plants
- Montreal protocol was signed in 1987 for control of
Biodiversity and Conservation
- Match the following with respect to meiosis List-I List-II (a) Zygotene (i) Terminalization (b) Pachytene (ii) Chiasmata (c) Diplotene (iii) Crossing over (d) Diakinesis (iv) Synapsis Select the correct option from the…
Cell Cycle and Division
- Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
Plant Growth and Development
- The ovary is half inferior in :
Morphology of Flowering Plants
- Match the trophic levels with their correct species examples in grassland ecosystem. List-I List-II (a) Fourth trophic level (i) Crow (b) Second trophic level (ii) Vulture (c) First trophic level (iii) Rabbit (d) Third…
Ecosystem
- In light reaction, plastoquinone facilitates the transfer of electrons from
Photosynthesis
- Match the following columns and select the correct option. Column-I Column-II (a) *Clostridium butylicum* (i) Cyclosporin-A (b) *Trichoderma polysporum* (ii) Butyric Acid (c) *Monascus purpureus* (iii) Citric Acid (d)…
Microbes in Human Welfare
- Match the following concerning essential elements and their functions in plants List-I List-II (a) Iron (i) Photolysis of water (b) Zinc (ii) Pollen germination (c) Boron (iii) Required for chlorophyll biosynthesis (d)…
Mineral Nutrition
- Which of the following is not an inhibitory substance governing seed dormancy?
Plant Growth and Development
- The body of the ovule is fused within the funicle at
Sexual Reproduction in Flowering Plants
- Floridean starch has structure similar to
Plant Kingdom
- The specific palindromic sequence which is recognized by EcoRI is
Biotechnology
- The process of growth is maximum during
Plant Growth and Development
- The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
Transport in Plants
- In water hyacinth and water lily, pollination takes place by :
Sexual Reproduction in Flowering Plants
- Which of the following regions of the globe exhibits highest species diversity?
Biodiversity and Conservation
- Which of the following is correct about viroids?
Diversity in Living World
- Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their
Plant Growth and Development
- Ray florets have
Morphology of Flowering Plants
- Which of the following is put into Anaerobic sludge digester for further sewage treatment?
Microbes in Human Welfare
- How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
Principles of Inheritance
- The sequence that controls the copy number of the linked DNA in the vector, is termed
Biotechnology
- The roots that originate from the base of the stem are
Morphology of Flowering Plants
Chemistry
- The calculated spin only magnetic moment of Cr^2+ ion is
d- and f-Block Elements
- Match the following and identify the correct option. List-I List-II (a) CO(g) + H_2(g) (i) Mg(HCO_3)_2 + Ca(HCO_3)_2 (b) Temporary hardness of water (ii) An electron deficient hydride (c) B_2H_6 (iii) Synthesis gas (d)…
Hydrogen and s-Block Elements
- The mixture which shows positive deviation from Raoult's law is
Solutions
- Identify the correct statement from the following :
Chemical Bonding
- Urea reacts with water to form A which will decompose to form B. B when passed through Cu^2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following ?
Coordination Compounds
- Hydrolysis of sucrose is given by the following reaction. Sucrose + H_2O arrow Glucose + Fructose If the equilibrium constant (K_C) is 2 × 10^13 at 300 K, the value of Δ_r G° at the same temperature will be :
Chemical Thermodynamics
- Identify the incorrect match. Name IUPAC Official Name (a) Unnilunium (i) Mendelevium (b) Unniltrium (ii) Lawrencium (c) Unnilhexium (iii) Seaborgium (d) Unununnium (iv) Darmstadtium
Periodic Classification
- Which of the following is a basic amino acid?
Biomolecules
- What is the change in oxidation number of carbon in the following reaction? CH_4(g) + 4Cl_2(g) arrow CCl_4(l) + 4HCl(g)
Redox and Electrochemistry
- The number of Faradays(F) required to produce 20 g of calcium from molten CaCl_2 (Atomic mass of Ca = 40 g mol^-1) is
Redox and Electrochemistry
- For the reaction, 2Cl_(g) arrow Cl_2_(g), the correct option is :
Chemical Thermodynamics
- The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.
d- and f-Block Elements
- Identify the incorrect statement.
p-Block Elements
- An increase in the concentration of the reactants of a reaction leads to change in
Chemical Kinetics
- Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as
Aldehydes Ketones and Acids
- A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
Basic Principles of Organic Chemistry
- Find out the solubility of Ni(OH)_2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)_2 is 2 × 10^-15
Equilibrium
- Identify a molecule which does not exist.
p-Block Elements
- Elimination reaction of 2-Bromo-pentane to form pent-2-ene is (a) β-Elimination reaction (b) Follows Zaitsev rule (c) Dehydrohalogenation reaction (d) Dehydration reaction
Haloalkanes and Haloarenes
- Measuring Zeta potential is useful in determining which property of colloidal solution?
Surface Chemistry
- The number of protons, neutrons and electrons in ^175_71Lu, respectively, are
Atomic Structure
- Identify the correct statements from the following : (a) CO_2(g) is used as refrigerant for ice-cream and frozen food. (b) The structure of C_60 contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5,…
p-Block Elements
- An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is
States of Matter
- Paper chromatography is an example of
Surface Chemistry
- Which of the following oxoacid of sulphur has – O – O – linkage?
p-Block Elements
- The rate constant for a first order reaction is 4.606 × 10^-3 s^-1. The time required to reduce 2.0 g of the reactant to 0.2 g is :
Chemical Kinetics
- Which of the following alkane cannot be made in good yield by Wurtz reaction?
Hydrocarbons
- Match the following : Oxide Nature (a) CO (i) Basic (b) BaO (ii) Neutral (c) Al_2O_3 (iii) Acidic (d) Cl_2O_7 (iv) Amphoteric Which of the following is correct option?
Periodic Classification
- A mixture of N_2 and Ar gases in a cylinder contains 7 g of N_2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N_2 is : [Use atomic masses (in g…
States of Matter
- The freezing point depression constant (K_f) of benzene is 5.12 K kg mol^-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two…
Solutions
- The correct option for free expansion of an ideal gas under adiabatic condition is
Chemical Thermodynamics
- Which one of the followings has maximum number of atoms?
Some Basic Concepts of Chemistry
- Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?
Coordination Compounds
- Which of the following is a natural polymer?
Polymers
- Which of the following set of molecules will have zero dipole moment?
Chemical Bonding
- HCl was passed through a solution of CaCl_2, MgCl_2 and NaCl. Which of the following compound(s) crystallise(s)?
Hydrogen and s-Block Elements
- Which of the following is not correct about carbon monoxide?
p-Block Elements
- Anisole on cleavage with HI gives
Alcohols Phenols and Ethers
- Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :
Alcohols Phenols and Ethers
- On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be
Redox and Electrochemistry
- Which of the following is a cationic detergent?
Chemistry in Everyday Life
Physics
- A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to L_1 when mass M is suspended from its free end. The expression for Young's modulus is:
Properties of Matter
- A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is : (R = 8.3 J mol^-1K^-1)
Kinetic Theory of Gases
- Light with an average flux of 20 W/cm^2 falls on a non-reflecting surface at normal incidence having surface area 20 cm^2. The energy received by the surface during time span of 1 minute is :
Electromagnetic Waves
- The mean free path for a gas, with molecular diameter d and number density n can be expressed as:
Kinetic Theory of Gases
- A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s^2)
Kinematics
- When a uranium isotope ^235_92U is bombarded with a neutron, it generates ^89_36Kr, three neutrons and :
Atoms and Nuclei
- A spherical conductor of radius 10 cm has a charge of 3.2 × 10^-7 C distributed uniformly. What is the magnitude of electric field at a point 15 cm from the centre of the sphere? (1/(4πε_0) = 9 × 10^9 Nm^2C^-2 )
Electrostatics
- Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The…
Thermodynamics
- An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m–1. The permeability of the material of the rod is : (mu_0 = 4π × 10^-7 T m A^-1)
Magnetism and Moving Charges
- The energy equivalent of 0.5 g of a substance is:
Atoms and Nuclei
- A 40 muF capacitor is connected to a 200 V, 50 Hz ac supply. The rms value of the current in the circuit is, nearly :
Electromagnetic Induction and AC
- The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves)
Electromagnetic Waves
- Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass. The centre of mass of the system from the 5 kg particle is nearly at a distance of :
Rotational Motion
- A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then…
Current Electricity
- In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :
Wave Optics
- A charged particle having drift velocity of 7.5 × 10^-4 m s^-1 in an electric field of 3 × 10^-10 V m^-1, has a mobility in m^2 V^-1 s^-1 of :
Current Electricity
- Dimensions of stress are :
Physical World and Measurement
- For which one of the following, Bohr model is not valid ?
Atoms and Nuclei
- A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is (π)/3. If instead C is removed from the circuit, the phase difference is…
Electromagnetic Induction and AC
- A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will…
Properties of Matter
- Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :
Wave Optics
- The solids which have the negative temperature coefficient of resistance are:
Current Electricity
- The capacitance of a parallel plate capacitor with air as medium is 6 F. With the introduction of a dielectric medium, the capacitance becomes 30 F. The permittivity of the medium is : (ε_0 = 8.85 × 10^-12 C^2 N^-1 m^-2)
Electrostatics
- The energy required to break one bond in DNA is 10^-20 J. This value in eV is nearly:
Atoms and Nuclei
- The increase in the width of the depletion region in a p-n junction diode is due to :
Semiconductor Electronics
- The quantities of heat required to raise the temperature of two solid copper spheres of radii r_1 and r_2 (r_1 = 1.5 r_2) through 1 K are in the ratio :
Thermodynamics
- For transistor action, which of the following statements is correct?
Semiconductor Electronics
- In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A…
Oscillations and Waves
- A short electric dipole has a dipole moment of 16 × 10^-9 C m. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of 60° with the…
Electrostatics
- A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?
Gravitation
- In a certain region of space with volume 0.2 m^3, the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :
Electrostatics
- The average thermal energy for a mono-atomic gas is : (k_B is Boltzmann constant and T, absolute temperature)
Kinetic Theory of Gases
- Find the torque about the origin when a force of 3j N acts on a particle whose position vector is 2k m.
Rotational Motion
- Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?
Dual Nature of Radiation
- A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : (mu_0 = 4π × 10^-7 T m A^-1)
Magnetism and Moving Charges
- The Brewster's angle i_b for an interface should be
Wave Optics
- An electron is accelerated from rest through a potential difference of V volt. If the de Broglie wavelength of the electron is 1.227 × 10^-2 nm, the potential difference is :
Dual Nature of Radiation
- Taking into account of the significant figures, what is the value of 9.99 m - 0.0099 m?
Physical World and Measurement
- A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is :
Physical World and Measurement
- The phase difference between displacement and acceleration of a particle in a simple harmonic motion is :
Oscillations and Waves
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