NEET-UG 2020 Question Paper — Set 2

An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with

The E.M. wave with shortest wavelength among the following is,

A wheel with 20 metallic spokes each 1 m long is rotated with a speed of 120 rpm in a plane perpendicular to a magnetic field of 0.4 G. The induced emf between the axle and rim of the wheel will be (1 G = 10⁻⁴ T)

Out of the following which one is a forward biased diode?

Two coherent sources of light interfere and produce fringe pattern on a screen. For central maximum, the phase difference between the two waves will be,

Time intervals measured by a clock give the following readings : 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s What is the percentage relative error of the observations?

An ideal gas equation can be written as P = ρRT / M₀ where ρ and M₀ are respectively,

The magnetic field in a plane electromagnetic wave is given by, B_y = 2×10⁻⁷ sin(π×10³x + 3π×10¹¹t)T Calculate the wavelength.

A barometer is constructed using a liquid (density = 760 kg/m³). What would be the height of the liquid column, when a mercury barometer reads 76 cm? (density of mercury = 13600 kg/m³)

The P-V diagram for an ideal gas in a piston cylinder assembly undergoing a thermodynamic process is shown in the figure.

The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment p(vector) is given by, (r >> separation of two charges forming the dipole, ε₀ - permittivity of free space)

A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the light bulb

Three identical spheres, each of mass M, are placed at the corners of a right angle triangle with mutually perpendicular sides equal to 2 m (see figure). Taking the point of intersection of the two mutually perpendicular sides as the origin, find the position vector of centre of mass.

The angle of 1' (minute of angle) in radian is nearly equal to

The total energy of an electron in the nᵗʰ stationary orbit of the hydrogen atom can be obtained by

A wire of length L metre carrying a current of I Ampere is bent in the form of circle. Its magnetic moment is

What is the depth at which the value of acceleration due to gravity becomes 1/n times the value that at the surface of earth? (radius of earth = R)

An object is placed on the principal axis of a concave mirror at a distance of 1.5 f (f is the focal length). The image will be at,

The acceleration of an electron due to the mutual attraction between the electron and a proton when they are 1.6 Å apart is, (mₑ = 9 × 10⁻³¹ kg, e = 1.6 × 10⁻¹⁹ C) (Take 1/4πε₀ = 9 × 10⁹ Nm²C⁻²)

If the critical angle for total internal reflection from a medium to vacuum is 45°, then velocity of light in the medium is,

A point mass 'm' is moved in a vertical circle of radius 'r' with the help of a string. The velocity of the mass is √7gr at the lowest point. The tension in the string at the lowest point is

The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is

The variation of electrostatic potential with radial distance rfrom the centre of a positively charged metallic thin shell of radius R is given by the graph

Which of the following gate is called universal gate?

Identify the function which represents a periodic motion.

A person sitting in the ground floor of a building notices through the window, of height 1.5 m, a ball dropped from the roof of the building crosses the window in 0.1 s. What is the velocity of the ball when it is at the top most point of the window? (g = 10 m/s²)

Which among the following salt solutions is basic in nature?

If 8 g of a non-electrolyte solute is dissolved in 114 g of n-octane to reduce its vapour pressure of 80%, the molar mass (in g mol⁻¹) of the solute is [Given that molar mass of n-octane is 114 g mol⁻¹]

Identify compound (a) in the following reaction:

Identify the incorrect statement from the following:

The half-life for a zero order reaction having 0.02 M initial concentration of reactant is 100 s. The rate constant (in mol L⁻¹ s⁻¹) for the reaction is

Match the coordination number and type of Hybridisation with distribution of hybrid orbitals in space based on valence bond theory.

Match the element in column I with that in column II.

In collision theory of chemical reaction, Z₍AB₎ represents

At standard conditions, if the change in enthalpy for the following reaction is −109 kJ mol⁻¹.

H₂(g) + Br₂(g) → 2HBr(g)

Given that bond energy of H₂ and Br₂ is 435 kJ mol⁻¹ and 192 kJ mol⁻¹ respectively, what is the bond energy (in kJ mol⁻¹) of HBr?

The solubility product for a salt of the type AB is 4 × 10⁻⁸. What is the molarity of its standard solution?

The potential energy (y) curve for H₂ formation as a function of internuclear distance (x) of the H atoms is shown below. The bond energy of H₂ is

Match the element in Column I with methods of purification in Column II.

A liquid compound (x) can be purified by steam distillation only if it is

What is the role of gypsum, CaS0₄.2H₂O in setting of cement? Identify the correct option from the following :

‘Which of te following substituted phenols is the strongest acid?

Deficiency of which vitamin causes osteomalacia?

Which one of the following reaction does not come under hydrolysis of phosphorus?

Which one of the following compounds shows both, Frenkel as well as Schottky defects?

Which of the following is not true about chloramphenicol?

The oxidation number of the underlined atom in the following species

Identify the incorrect option.

Which of the following will NOT undergo Sₙ1 reaction with OH⁻ ?

Reaction of propanamide with ethanolic sodium hydroxide and bromine will give

In which of the sols, the colloidal particles are with negative charge?

The minimum pressure required to compress 600 dm³ of a gas at 1 bar to 150 dm³ at 40°C is

The number of angular nodes and radial nodes in 3s orbital are

Which of the following statement is correct about Bakelite?

Among the compounds shown below which one revealed a linear structure?

The reaction of concentrated sulphuric acid with carbohydrate (C₁₂H₂₂O₁₁) is an example of

Which of the following compound is most reactive in electrophilic aromatic substitution?

In a typical fuel cell, the reactant (R) and product (P) are

Which of the following statement is NOT true about acid rain?

Match the compounds of Xe in column I with the molecular structure in column II

Which of the following is a free radical substitution reaction?

If for a certain reaction ΔᵣᵣH is 30 kJ mol⁻¹ at 450 K, the value of Δ ᵣS (in JK⁻¹ mol⁻¹) for which the same reaction will be spontaneous at the same temperature, is

Which of the following statement is not true about glucose?

Identify the correct statement from the following.

Identify the reaction from following having top position in EMF series (Std. red. potential at 298 K).

Which of the following acid will form an (a) Anhydride on heating and (b) Acid imide on strong heating with ammonia?

One mole carbon atom weighs 12 g, the number of atoms in it is equal to, (Mass of carbon-12 is 1.9926 × 10⁻²³ g)

Which of the following oxide is amphoteric in nature?

Isotonic solutions have same

How many (i) sp² hybridised carbon atoms and (ii) π bonds are present in the following compound?

Chromosomal theory of inheritance was proposed by

Which of the following is incorrect about Cynobacteria?

The impact of immigration on population density is

Which of the following statements is incorrect?

Inclusion bodies of blue-green, purple and green photosynthetic bacteria are

Which of the following is the correct floral formula of Liliaceae?

Male and female gametophytes do not have an independent free living existence in :

Inhibitory substances in dormant seeds cannot be removed by subjecting seeds to :

In some plants thalamus contributes to fruit formation. Such fruits are termed as:

The biosynthesis of ribosomal RNA occurs in :

Large, empty colorless cells of the adaxial epidermis along the veins of grass leaves are

Identify the wrong match pair :

Match the following aspects with the respective metal

(B) The metal although placed in the 3d block is considered not as a transition (ii) Copper

element.

(C) The metal which does not exhibit variable oxidation states. (iii) Manganese

(D) The metal which in +1 oxidation state in aqueous solution (iv) Zinc

undergoes disproportionation.

What is Z?

The Mean Free Path l for a gas molecule depends upon the diameter, d, of the molecule as:

For the circuit shown in the figure, the current I will be

The equivalent resistance between A and B for the mesh shown in the figure is

In a mixture, DNA fragments are separated by

Which of the following is incorrect for wind-pollinated plants?

In a mitotic cycle, the correct sequence of phases is

Embryological support for evolution was proposed by

Phycorythrin is the major pigment in

According to Alexander von Humboldt

In the polynucleotide chain of DNA, a nitrogenous base is linked to the -OH of

During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PSII, what is the source which replaces these electrons?

In Recombinant DNA technology antibiotics are used

Which of the following statements is incorrect?

Attachment of spindle fibers to kinetochores of chromosomes begins in

Correct position of floral parts over thalamus in mustard plant is

After about how many years of formation of earth, life appeared on this planet?

The term 'Nuclein' for the genetic material was used by

Select the incorrect statement.

The number of contrasting characters studied by Mendel for his experiments was

Vegetative propagule in Agave is termed as

Identify the statement which is incorrect.

A species which was introduced for ornamentation but has become a trouble-some weed in India :

Pyruvate dehydrogenase activity during aerobic respiration requires :

A n-p-n transistor is connected in common emitter configuration (see figure) in which collector voltage drop across load resistance (800 Ω) connected to the collector circuit is 0.8 V. The collector current is

For the circuit given below, the Kirchoff's loop rule for the loop BCDERB is given by the equation

Calculate the acceleration of the block and trolly system shown in the figure. The coefficient of kinetic friction between the trolly and the surface is 0.05. (g = 10 m/s²?, ‘mass of the string is negligible and no other friction exists).

A parallel plate capacitor having cross-sectional area A and separation d has air in between the plates. Now an insulating slab of same area but thickness d/2 is inserted between the plates as shown in figure having dielectric constant K(=4). The ratio of new capacitance to its original capacitance to its original capacitance will be

In the following, in each set a conservation approach and an example of method of conservation are given

(A) In situ conservation – Biosphere Reserve

(B) Ex situ conservation – Sacred groves

(C) In situ conservation – Seed bank

(D) Ex situ conservation – Cryopreservation

Select the option with correct match of approach and method

Match the following techniques or instruments with their usage:

Identify the correct features of Mango and Coconut fruits.

(i) In both, fruit is a drupe.
(ii) Endocarp is edible in both.
(iii) Mesocarp in Coconut is fibrous, and in Mango it is fleshy.
(iv) In both, fruit develops from a monocarpellary ovary only.

Select the correct option from below:

Match the items in Column I with those in Column II:

Select the correct option from the following:

Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants:

In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as:

Which of the following statements about cork cambium is incorrect?

Match the following:

Select the correct option:

Which of the following statements is incorrect about gymnosperms?

Which of the following elements helps in maintaining the structure of ribosomes?

Match the following concerning the activity/function and the phytohormone involved:

Select the correct option from the following:

Who coined the term 'Kinetin'?

Which of the following statements is incorrect regarding the phosphorus cycle?

First discovered restriction endonuclease that always cuts DNA molecule at a particular point by recognising a specific sequence of six base pairs is

Which of the following is associated with decrease in cardiac output?

Match the following group of organisms with their respective distinctive characteristics and select the correct option.

Which is the basis of genetic mapping of human genome as well as DNA fingerprinting?

The best example for pleiotropy is:

The total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a force inspiration. This includes:

Hormones stored and released from neurohypophysis are

According to Central Pollution Control Board (CPCB) what size (in diameter) of particulate is responsible for causing greater harm to human health?

Cyclosporin A, used as immunosuppression agent, is produced from

For the commercial and industrial production of Critic Acid, which of the following microbes is used?

All vertebrates are chordates but all chordates are not vertebrates, why?

The phenomenon of evolution of different species in a given geographical area starting from a point and spreading to other habitats is called

E. coli has only 4.6 × 10⁶ base pairs and completes the process of replication within 18 minutes; then the average rate of polymerisation is approximately:

The size of Pleuropneumonia-like organism (PPLO) is:

Intrinsic factor that helps in the absorption of vitamin B₁₂ is secreted by:

Match the following columns with reference to cockroach and select the correct option:

The increase in osmolarity from outer to inner medullary interstitium is maintained due to:

(i) Close proximity between Henle's loop and vasa recta
(ii) Counter current mechanism
(iii) Selective secretion of HCO₃⁻ and hydrogen ions in PCT
(iv) Higher blood pressure in glomerular capillaries

Select the correct statement:

Which of the following STDs are not curable?

Match the following columns and select the correct option:

Hominid fossil discovered in Java in 1891, now extinct, having cranial capacity of about 900 cc was:

The proteolytic enzyme rennin is found in:

Match the following columns and select the correct option:

Select the incorrectly matched pair from the following:

The yellowish fluid "colostrum" secreted by mammary glands of mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as:

Select the correct option of haploid cells from the following groups:

During Meiosis I, in which stage synapsis takes place?

Select the correct statement from the following:

Spooling is:

Match the following columns and select the correct option:

Match the following columns and select the correct option:

The laws and rules to prevent unauthorised exploitation of bio-resources are termed as:

Match the following columns and select the correct option:

RNA interference is used for which of the following purposes in the field of biotechnology?

The rate of decomposition is faster in the ecosystem due to following factors EXCEPT:

Which of the following conditions cause erythroblastosis foetalis?

In Human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of

‘Which of the following options does correctly represent the characteristic features of phylum Annelida?

Inbreeding depression is

Match the following columns and select the correct option:

Match the following columns and select the correct option:

Match the following columns and select the correct option:

Match the following columns and select the correct option:

In cockroach, identify the parts of the foregut in correct sequence:

Match the following events that occur in their respective phases of cell cycle and select the correct option:

Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to

According to Robert May, the global species diversity is about