NEET-UG 2019 Question Paper

The unit of thermal conductivity is :

In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where X= A²B¹ᐟ²/ C¹ᐟ³D³ will be:

The speed of a swimmer in still water is 20 m/s. The speed of river water is 10 m/s and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by:

A particle moving with velocity v is acted by three forces shown by the vector triangle PQR. The velocity of the particle will:

A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be (g = 10 m/s²):

A force F = 20 + 10y acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from y = 0 to y = 1 m is:

Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is:

Two particles A and B are moving in uniform circular motion in concentric circles of radii rA and rB with speed vA and vB respectively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be: (a) rA : rB (b) vA : vB (c) rB : rA (d) 1 : 1

A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2 revolutions is:

A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?

The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is:

When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + l). The elastic potential energy stored in the extended wire is:

A small hole of area of cross-section 2 mm² is present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s², the rate of flow of water through the open hole would be:

A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10⁻² N/m. The pressure inside the bubble equals at a point Z₀ below the free surface of water in a container. Taking g = 10 m/s², density of water = 10³ kg/m³, the value of Z₀ in cm is:

A copper rod of 88 cm and an aluminium rod of same length have their increase in length independent of increase in temperature. The length of aluminium rod is: (α_Cu = 1.7 × 10⁻⁵ K⁻¹ and α_Al = 2.2 × 10⁻⁵ K⁻¹)

A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 10⁵ Nm⁻²) requires 54 cal of heat energy to convert it into steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is:

In which of the following processes, heat is neither absorbed nor released by a system?

Increase in temperature of a gas filled in a container would lead to:

The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig. y-projection of the radius vector of rotating particle P is:

Average velocity of a particle executing SHM in one complete oscillation is:

The displacement of a particle executing simple harmonic motion is given by

y = A₀ + A sin ωt + B cos ωt.

Then the amplitude of its oscillation is given by:

Two point charges A and B, having charges +Q and −Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, the force between the charges becomes:

Two parallel infinite line charges with linear charge densities +λ C/m and −λ C/m are placed at a distance of 2R in free space. What is the electric field midway between the two line charges?

A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:

Six similar bulbs are connected as shown in the figure connected to a DC source of emf E, and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

In the circuits shown below, the readings of the voltmeters and the ammeters will be :

Ionized hydrogen nucleus and α-particles with same momentum enter perpendicular to a constant magnetic field, B. The ratio of their radii of their paths r_H : r_α will be:

At a point A on the earth's surface the angle of dip, δ = +25°. At a point B on the earth's surface the angle of dip, δ = −25°. We can interpret that:

A 800 turn coil of effective area 0.05 m² is kept perpendicular to magnetic field 5 × 10⁻⁵ T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the induced potential will be:

Which colour of the light has the longest wavelength?

In total Internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F₁. When the space between two lenses is filled with glycerin (which has the same refractive index (=1.5) as that of glass) then the equivalent focal length is F₂. The ratio F₁ : F₂ will be:

Pick the wrong answer in the context with rainbow.

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed in a way, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? (μ_water = 4/3)

An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly): (m = 9 × 10⁻³¹ kg)

The total energy of an electron in an atom in an orbit is −3.4 eV. Its kinetic and potential energies are, respectively:

α-particle consists of:

For a p-type semiconductor, which of the following statements is true?

The correct Boolean operation represented by the circuit diagram drawn is:

A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth?

Which of the following acts as a circuit protection device?

A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires and the displacement current through the plates of the capacitor, would be, respectively:

When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60° with horizontal, it can travel a distance x₁ along the plane. But when the inclination is decreased to 30° and the same object is shot with the same velocity, it can travel x₂ distance. Then x₁ : x₂ will be:

The number of moles of hydrogen molecule required to produce 20 moles of ammonia under Haber’s process is:

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:

For the second period elements the correct increasing order of first ionisation enthalpy is:

The manganate and permanganate ions are tetrahedral, due to:

Which of the following diatomic molecular species has only π-bonds according to Molecular Orbital Theory?

A gas at 350 K and 15 bar has molar volume 20 percent smaller than ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is [Given that 1 L bar = 100 J]

In which case change in entropy is negative?

Conjugate base of Bronsted acid H₂O and HF are:

If pH of a saturated solution of Ca(OH)₂ is 9. The solubility product (Kₛₚ) of Ca(OH)₂ is:

Which of the following reactions is disproportionation reaction?
Select the correct option from the following:

This method used to remove temporary hardness of water:

Which of the following is an amphoteric hydroxide?

Enzymes that utilize ATP in phosphate transfer require an alkaline earth metal (M) as the cofactor. M is:

Which of the following is incorrect statement?

Which of the following species is not stable?

The most suitable reagent for the following conversion, is:

Among the following, the one that is not a greenhouse gas is:

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:

The mixture which shows positive deviation from Raoult's law is:

The mixture that forms maximum boiling azeotrope is:

For a cell involving one electron E°_cell = 0.59 V at 298 K, the equilibrium constant for the cell reaction is:
[Given that 2.303RT/F = 0.059 V at T = 298 K]

For the cell reaction
2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(aq)
0.24 V at 298 K. The standard Gibbs energy (ΔG°) of the reaction is:
[Given that Faraday constant F = 96500 C mol⁻¹]

If the rate constant for a first order reaction is k, the time (t) required for completion of 99% of the reaction is given by:

For the chemical reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
the correct option is:

Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I⁻ sol?

Which one is malachite from the following?

Which is the correct thermal stability order for H₂E (E = O, S, Se, Te and Po)?

Match the following:

Identify the incorrect statement related to PCl₅ from the following:

What is the correct electronic configuration of the central atom in [Fe(CN)₆]³⁻ based on crystal field theory?

The correct order of the basic strength of methyl substituted amines in aqueous solution is:

The non-essential amino acid among the following is:

The biodegradable polymer is:

Among the following, the narrow spectrum antibiotic is:

For an ideal solution, the correct option is:

Which will make basic buffer?

The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is:

Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code:

Select the correctly written scientific name of Mango which was first described by Carolus Linnaeus:

The contrasting characteristics generally in a pair used for identification of animals in Taxonomic Key are referred to as:

Among the following, the reaction that proceeds through an electrophilic substitution, is:

An alkene “A” on reaction with O₃ and Zn–H₂O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene “A” gives the major product. The structure of product “B” is:

One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of:

The organisms in column I with habitats in column II.

Select the correct answer from the options given below:

Which of the following statements is incorrect?

Which of the following statements is incorrect?

Mad cow disease in cattle is caused by an organism which has:

Pinus seed cannot germinate and establish without fungal association. This is because:

Phloem in gymnosperms lacks:

Which of the following animals are true coelomates with bilateral symmetry?

Consider following features:
(a) Organ system level of organisation
(b) Bilateral symmetry
(c) True coelomates with segmentation of body
Select the correct option of animal groups which possess all the above characteristics.

Match the following organisms with their respective chracteristics:

Regeneration of damaged growing grass following grazing is largely due to:

Xylem translocates:

Which of the statements given below is not true about formation of annual rings in trees?

Match the following cell structure with its characteristic feature :

Which of the following statements is INCORRECT?

Which of the following nucleic acid is present in an organism having 70S ribosomes only?

Which of the following cell organelles is present in the highest number in secretory cells?

Match the column I with column II

Choose the right match from options given below:

Concanavalin A is:

Purines found both in DNA and RNA are:

Which of the following glucose transporters is insulin-dependent?

Consider the following statements:
(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.

Cells in G₀ phase:

The correct sequence of phases of cell cycle is:

Which of the following is not a feature of active transport of solutes in plants?

What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?

The main difference between active and passive transport across cell membrane is:

What is the direction of movement of sugars in phloem?

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

Which of the following bacteria reduce nitrate in soil into nitrogen?

Thiobacillus is a group of bacteria helpful in carrying out:

In Hatch and Slack pathway, the primary CO₂ acceptor is:

Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalysed by:

Where is the respiratory electron transport system (ETS) located in plants?

Respiratory Quotient (RQ) value of tripalmitin is:

Removal of shoot tips is a very useful technique to boost the production of tea leaves. This is because:

In order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed?

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied artificially to induce flowering in pineapple plants throughout the year to increase yield?

What is the site of perception of photoperiod necessary for induction of flowering in plants?

Match the items given in Column-I with Column- II and choose the correct option.

Identify the cells whose secretion protects the lining of gastrointestinal tract from digestive enzymes.

Match the following structures with their respective location in organs:

Tidal volume and Expiratory reserve volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory capacity if the residual volume is 1200 mL?

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

A specialised nodal tissue embedded in the lower corner of the right atrium, close to Atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. This delay allows:

Match the Column-I with Column-II

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?

Which of the following factors is responsible for the formation of concentrated urine?

Use of artificial kidney during haemodialysis may result in:
(A) Nitrogenous waste build-up in the body.
(B) Non-elimination of excess potassium ions.
(C) Reduced absorption of calcium ions from gastrointestinal tract.
(D) Reduced RBC production.
Which of the following options is the most appropriate?

Select the correct option:

Which of the following muscular disorders is inherited?

Which of the following statements is not correct?

Match the following hormones with the respective disease:

In some plants, the female gamete develops into embryo without fertilisation. This phenomenon is known as:

What is the fate of the male gametes discharged in the synergid?

Which one of the following statements regarding post-fertilisation development in flowering plants is incorrect?

Persistent nucellus in the seed is known as:

Extrusion of second polar body from egg nucleus occurs:

Select the correct sequence for transport of sperm cells in male reproductive system:

Which of the following contraceptive methods do involve
a role of hormone?

Select the hormone-releasing Intra-Uterine Devices.

Which of the following sexually transmitted diseases is
not completely curable?

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂
generation showed white, red and pink flowers. Choose the incorrect statement from the following.

What map unit (Centimorgan) is adopted in the construction of genetic maps?

Select the incorrect statement.

Under which of the following conditions will there be no change in the reading frame of following mRNA ?

5′ AACACGGGUGCUAUU 3′

Expressed Sequence Tags (ESTs) refers to:

Match the following genes of the Lac operon with their respective products:

A population of a species invades a new area. Which of the following condition will lead to adaptive radiation?

In Australia, marsupials and placental mammals have evolved to share many similar characteristics. This type of evolution may be referred to as:

In a species, the weight of newborn ranges from 2 to 5kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with
weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?

Which of the following statements is correct about the origin and evolution of men?

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population ?

Match the hominids with their correct brain size:

Variations caused by mutation, as proposed by Hugo de Vries, are:

Identify the correct pair representing the causative agent of typhoid fever and the confirmatory test for the disease.

Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains:

Select the incorrect statement regarding inbreeding.

Select the incorrect statement.

Match Column- I with Column- II.

Match the Following organisms with the products they produce:

Which of the following is a commercial blood cholesterol lowering agent?

Select the correct group of biocontrol agents.

Which of the following can be used as a biocontrol agent in the treatment of plant disease?

Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?

Following statements describe the characteristics of the enzyme Restriction Endonuclease. Identify the incorrect statement.

DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:

A cylindrical conductor of radius R is carrying a constant current. The plot of the magnitude of the magnetic field, B with the distance, d, from the centre of the conductor, is correctly represented by the figure:

The structure of intermediate A in the following reaction is:

The compound that is most difficult to protonate is:

The major product of the following reaction is :