NEET-UG 2021 Question Paper

A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is

Polar molecules are the molecules

Column-I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match Column-I and Column-II with appropriate relations.

Two charged spherical conductors of radius R₁ and R₂ are connected by a wire. Then the ratio of surface charge densities of the spheres (σ₁/σ₂) is

A parallel plate capacitor has a uniform electric field E vector in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitor is (ε₀ = permittivity of free space)

An infinitely long straight conductor carries a current of 5 A as shown. An electron is moving with a speed of 10⁵ m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

If E and G respectively denote energy and gravitational constant, then E/G has the dimensions of

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since

Match Column - I and Column - I and choose the correct match from the given choices.

Consider the following statements (A) and (B) and identify the correct answer.

(A) A zener diode is connected in reverse bias, when used as a voltage regulator.

(B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

A dipole is placed in an electric field as shown. In which direction will it move?

A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be

The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is

An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of potential difference 'V' volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCR series circuit is 10√2 A. The impedance of the circuit is

A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively

A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let S subscript n be the distance travelled by the block in the interval t = n − 1 to t = n. Then, the ratio S subscript (n) / S subscript (n+1) is

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be

The equivalent capacitance of the combination shown in the figure is

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 Ω. What will be the effective resistance if they are connected in series?

A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the binding energy in the process is

The number of photons per second on an average emitted by the source of mono-chromatic light of wavelength 600 nm, when it delivers the power of 3.3 × 10⁻³ watt will be (h = 6.6 × 10⁻³⁴ J s)

A thick current carrying cable of radius 'R’ carries current ' uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance ' from the axis of the cable is represented by

A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V = V₀sin ωt The displacement current between the plates of the capacitor, would then be given by

The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is d/2, then the viscous force acting on the ball will be

Find the value of the angle of emergence from the prism. Refractive index of the glass is √𝟑.

If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is

For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

An electromagnetic wave of wavelength 'λ' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength λ Subscript d, then

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s²)

Twenty seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of

In the product F vector = q (v vector × B vector) = q v vector × (B î + B ĵ + B₀ k̂) For q = 1 and v vector = 2î + 4ĵ + 6k̂ and F vector = 4î - 20ĵ + 12k̂ What will be the complete expression for B vector

Two conducting circular loops of radii R₁ and R₂ are placed in the same plane with their centres coinciding. If R₁ >> R₂, the mutual inductance M between them will be directly proportional to

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y?

From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is 'K' times 'MR²'. Then the value of 'K' is

Three resistors having resistances r₁, r₂ and r₃ are connected as shown in the given circuit. The ratio i₃ / i₁ of currents in terms of resistances used in the circuit is

A car starts from rest and accelerates at 5 m/s². At t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s? (Take g = 10 m/s²)

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g = 10 m/s²) nearly

A series LCR circuit containing 5.0 H inductor, 80μ F capacitor and 40 Ω resistor is connected to 230V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be

A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended from the rod at 20 cm and another unknown mass 'm' is suspended from the rod at 160 cm mark as shown in the figure. Find the value of 'm' such that the rod is in equilibrium. (g = 10 m/s²)

A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side 'a'. (ii) a square of side 'a'. The magnetic dipole moments of the coil in each case respectively are

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

Which one among the following is the correct option for right relationship between 𝐂ₚ and 𝐂ᵥ for one mole of ideal gas?

The structures of beryllium chloride in solid state and vapour phase, are :

The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?

BF₃ is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

‘What is the IUPAC name of the organic compound formed in the following chemical reaction?

The molar conductance of NaCl, HCl and CH₃COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm² mol⁻¹ respectively. The molar conductance of CH₃COOH at infinite dilution is. Choose the right option for your answer.

The incorrect statement among the following is:

Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI.

Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.

The correct structure of 2, 6-Dimethyl-dec-4-ene is

The correct sequence of bond enthalpy of 'C—X' bond is :

A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light c = 3.0 × 10⁸ ms⁻¹]

The p K Subscript (b) of dimethylamine and p Kₐ of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is :

The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 mL of water (P₁), 10 g of urea (CH₄N₂O) in 250 mL of water (P₂) and 10 g of sucrose (C₁₂H₂₂O₁₁) in 250 mL of water (P₃). The right option for the decreasing order of osmotic pressure of these solutions is :

For a reaction A → B, enthalpy of reaction is −4.2 kJ mol⁻¹ and enthalpy of activation is 9.6 kJ mol⁻¹. The correct potential energy profile for the reaction is shown in option.

The compound which shows metamerism is :

The major product of the following chemical reaction is:

Which of the following reactions is the metal displacement reaction? Choose the right option.

Ethylene diaminetetraacetate (EDTA) ion is :

Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

Dihedral angle of least stable conformer of ethane is :

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

Which one of the following polymers is prepared by addition polymerisation?

Match List-I with List-II. Choose the correct answer from the options given below.

For irreversible expansion of an ideal gas under isothermal condition, the correct option is:

Match List-I with List-II.

Choose the correct answer from the options given below.

The product formed in the following chemical reaction is:

In which one of the following arrangements the give sequence is not strictly according to the properties indicated against it?

Consider the above reaction and identify the missing reagent/chemical.

Which of the following molecules is non-polar in nature?

Match List-I with List-II.

Choose the correct answer from the options given below.

Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O₂ and 2 g H₂ confined in a total volume of one litre at 0°C is: [Given R = 0.082 L atm mol⁻¹ K⁻¹, T = 273 K]

The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3 : 2 is: [At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

From the following pairs of ions which one is not an iso-electronic pair?

The intermediate compound 'X' in the following chemical reaction is:

The reagent 'R! in the given sequence of chemical reaction is:

The slope of Arrhenius plot (ln k v/s 1/T) of first order reaction is −5 × 10³ K. The value of Eₐ of the reaction is. Choose the correct option for your answer. [Given R = 8.314 J K⁻¹ mol⁻¹]

Match List-I with List-II Choose the correct answer from the options given below.

Which of the following statements is not correct?

Which of the following plants is monoecious?

The first stable product of CO₂ fixation in Sorghum is

Diadelphous stamens are found in

DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as

Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called

In the equation GPP − R = NPP, R represents:

The production of gametes by the parents, formation of zygotes, the F₁ and F₂ plants, can be understood from a diagram called:

Which of the following is an incorrect statement?

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as:

The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

Which of the following stages of meiosis involves division of centromere?

Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?

When gene targeting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as:

Match List-I with List-II. Choosethe correct answer from the options given below.

The factor that leads to Founder effect in a population is :

When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as :

Gemmae are present in

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out :

Match List-I with List-II. Choose the correct answer from the options given below.

The site of perception of light in plants during photoperiodism is

The plant hormone used to destroy weeds in a field

Which of the following algae produce Carrageen?

Complete the flow chart on central dogma.

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

Which of the following is not an application of PCR (Polymerase Chain Reaction)?

Match List-I with List-II. Select the correct answer from the options given below.

A typical angiosperm embryo sac at maturity is:

Which of the following algae contains mannitol as reserve food material?

Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:

Amensalism can be represented as:

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

Select the correct pair.

Plasmid pBR322 has PstI restriction enzyme site within gene ampᴿ that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as

In the exponential growth equation Nₜ = N₀eʳᵗ, e represents

Which of the following statements is incorrect?

Which of the following statements is correct?

Which of the following statements is incorrect?

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

Identify the correct statement.

Match Column-I with Column-II

Select the correct answer from the options given below.

Match List-I with List-II.

Choose the correct answer from the options given below.

Match List-I with List-II.

Choose the correct answer from the options given below.

Now a days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because :

Erythropoietin hormone which stimulates R.B.C. formation is produced by:

Which of the following characteristics is incorrect with respect to cockroach?

Succus entericus is referred to as:

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are:

Match the following:

During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?

Match the following:

Choose the correct answer from the options given below

Which of the following statements wrongly represents the nature of smooth muscle?

Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as:

Persons with 'AB' blood group are called as "Universal recipients". This is due to :

The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G₁ phase is 8, what would be the number of chromosomes after S phase?

Receptors for sperm binding in mammals are present on :

Which one of the following belongs to the family Muscidae?

Identify the incorrect pair

Venereal diseases can spread through :
(A) Using sterile needles
(B) Transfusion of blood from infected person
(C) Infected mother to foetus
(D) Kissing
(E) Inheritance

Choose the correct answer from the option given below

The organelles that are included in the endomembrane system are

For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?

With regard to insulin choose correct options.
(A) C-peptide is not present in mature insulin.
(B) The insulin produced by rDNA technology has C- peptide.
(C) The pro-insulin has C-peptide.
(D) A-peptide and B-peptide of insulin are interconnected by disulphide bridges.

Choose the correct answer from the options given below

A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:

Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

Which one of the following organisms bears hollow and pneumatic long bones?

Read the following statements
(A) Metagenesis is observed in Helminths.
(B) Echinoderms are triploblastic and coelomate animals.
(C) Round worms have organ-system level of body organization.
(D) Comb plates present in ctenophores help in digestion.
(E) Water vascular system is characteristic of Echinoderms.

Choose the correct answer from the options given below.

Match List-I with List-IL.

Choose the correct answer from the option given below

Sphincter of oddi is present at:

If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

Match List - I with List - II

Choose the correct answer from the options given below.

Which enzyme is responsible for the conversion of inactive fibrinogen to fibrins?

Which of the following is not an objective of Biofortification in crops?

Dobson units are used to measure thickness of:

Which of the following statements is incorrect?

Which one of the following is an example of Hormone releasing IUD?

The centriole undergoes duplication during:

Which of the following RNAs is not required for the synthesis of protein?

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

Select the favourable conditions required for theformation of oxyhaemoglobin at the alveoli.

Match List-I with List - II

Choose the correct answer from the options given below.

Match List-I with List - II

Choose the correct answer from the options given below.

Which of these is not an important component of initiation of parturition in humans?

Which one of the following statements about Histones is wrong?

During muscular contraction which of the following events occur?
(A) 'H' zone disappears
(B) 'A' band widens
(C) 'I' band reduces in width
(D) Myosine hydrolyzes ATP, releasing the ADP and Pi.
(E) Z-lines attached to actin are pulled inwards.

Choose the correct answer from the options given below:

Match List-I with List - II

Choose the correct answer from the options given below.

Assertion (A): A person goes to high altitude and experiences altitude sickness with symptoms like breathing difficulty and heart palpitations.
Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct options from the options given below

The Adenosine deaminase deficiency results into

Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET)?

Match List-I with List - II

Choose the correct answer from the options given below.

Following are the statements with reference to 'lipids'
(A) Lipids having only single bonds are called unsaturated fatty acids
(B) Lecithin is a phospholipid.
(C) Trihydroxy propane is glycerol.
(D) Palmitic acid has 20 carbon atoms including carboxyl carbon.

Choose the correct answer from the options given below.

Following are the statements about prostomium of earthworm.
(A) It serves as a covering for mouth.
(B) It helps to open cracks in the soil into which it can crawl.
(C) It is one of the sensory structures.
(D) It is the first body segment.

Choose the correct answer from the options given below.

Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

Statement I: The codon 'AUG' codes for methionine and phenylalanine.
Statement II: 'AAA' and 'AAG' both codons code for the amino acid lysine.

In the light of the above statements, choose the correctanswer from the options given below.

Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.