NEET 2015 — Code A

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

Gadolinium belongs of 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

The formation of the oxide ion, O2−(g), from oxygen atom requires first an exothermic and then an endothermic step as shown in below: O(g)+e−⟶O−(g) ; ΔfH⊖=−141 kJ mol−1 O−(g)+e−⟶O2 − (g) ; ΔfH⊖=+780 kJ mol−1 Thus process of formation of O2− in gas phase is unfavourable though O2− is isoelectronic with neon. It is due to the fact that,

The number of structural isomers possible from the molecular formula C3H9N is:

If the equilibrium constant for N2(g)+O2(g)⇌2NO(g) is K, the equilibrium constant for 1 2 N2(g)+ 1 2 O2(g)⇌NO(g) will be:

Which one of the following pairs of solution is not an acidic buffer?

Aqueous solution of which of the following compounds is the best conductor of electric current?

Caprolactum is used for the manufacture of:

On heating which of the following releases CO2 most easily?

Strong reducing behaviour of H3PO2 is due to:

Decreasing order of stability of O₂, O₂⁻, O₂⁺ and O₂²⁻ is:

The number of water molecules is maximum in:

In which of the following pairs, both the species are not isostructural?

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov’s rule, to give a product 1-chloro-1- methylcyclohexane. The possible reaction alkene is:

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation? www.vedantu.com 55

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

The vacant space in bcc lattice unit cell is:

Which of the statements given below is incorrect?

The name of complex ion, [Fe(CN)6]3− is :

If Avogadro number NA , is changed from 6.022×1023 mol−1 to 6.022×1020 mol−1, this would change:

Which of the following statements is not correct for a nucleophile?

A gas such as carbon monoxide would be most likely to obey the ideal gas law at:

The hybridization involved in complex [Ni(CN)4]2− is: (Atomic number of Ni = 28) www.vedantu.com 53

The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight: Mg = 24)

What is mole fraction of the solute in a 1.00 m aqueous solution?

The correct statement regarding defects in crystalline solids is :

The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence:

Two possible stereo-structures of CH3CHOH∙COOH, which are optically active, are called:

The following reaction Is known by the name:

The sum of coordination number and oxidation number of metal M in the complex [M(en)2(C2O4)]Cl (Where en is ethylenediamine) is:

Which one of the following esters gets hydrolyzed most easily under alkaline conditions?

In an SN1 reaction on chiral centres, there is:

The rate constant of the reaction A → B is 0.6×10⁻³ mole per litre per second. If the concentration of A is 5 M, then concentration of B after 20 minutes is:

What is the pH of the resulting solution when equal volumes of 0.1 m NaOH and 0.01 M HCl are mixed?

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be: (en = ethylene diamine)

The variation of the boiling points of the hydrogen halides is in the order HF>HI>HBr>HCl. What explains the higher boiling point of hydrogen fluoride?

What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)

The oxidation of benzene by V2O5 in the presence of air produces:

Which of the following is not the product of dehydration of ?

Method by which Aniline cannot be prepared is: www.vedantu.com 60

Which of the following reaction(s) can be used for the preparation of alkyl halides? www.vedantu.com 48 I. CH3CH2OH+HCl Anhyd.ZnCl2 → II. CH3CH2OH+HCl⟶ III. (CH3)3COH+HCl⟶ IV. (CH3)2CHOH+HCl Anhyd.ZnCl2 →

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (Atomic No. Z = 22)

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

Human urine is usually acidic because

Which one is a wrong statement?

Which of the following structure is not found in a prokaryotic cell?

Which one of the following animals has two separate circulatory pathways?

Most animals that live in deep oceanic waters are :

An association of individuals of different species living in the same habitat and having functional interections is:

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

Axile placentation is present in :

In which of the following both pairs have correct combination?

In mammalian eye, the ‘fovea’ is the center of the visual field, where :

Choose the wrong statement:

Which of the following are not membrane – bound?

In which of the following interactions both partners are adversely affected?

A colour blind man marries a women with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?

Ectopic pregnancies are referred to as :

Cellular organelles with membranes are:

Cell wall is absent in:

The term ‘’linkage’’ was coined by :

Which of the following biomolecules does have a phosphodiester bond?

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth :

A protoplast is a cell :

In which group of organisms the cell walls form two thin lapping shells which fit together

The DNA molecule to which the gene of interest is integrated for cloning is called :

Male gametophyte in angiosperms producers :

Coconut water from a tender coconut is :

The species confined to a particular region and not found elsewhere termed as :

Metagenesis refers to :

The enzyme that is not present in succus entericus is:

Eutrophication of water bodies leading to killing of fishes is mainly due to non-availability of:

The function of the gap junction is to :

Arrange the following events of meiosis in correct sequence : (a) Crossing over (b) Synapsis (c) Terminalisation of chiasmata (d) Disappearance of nucleolus

The cutting of DNA at specific location became possible with the discovery of :

During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by:

Grafted kidney may be rejected in a patient due to:

The body cells in cockroach discharges their nitrogenous waste in the Haemolymph mainly in the form of :

Filiform apparatus is characteristic features of :

Acid rain is caused by increase in the atmospheric concentration of :

The wheat grain has an embryo with one large, shield-shaped cotyledon known as :

Among China rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plants have superior ovary?

Which of the following is not a function of the skeletal system?

Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of :

Chromatophores take part in :

Select the wrong statement :

A pleiotropic gene

Auxin can be bioassayed by:

Which of the following events is not associated with ovulation in human female?

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of phylum:

Which one of the following hormones is not involved in sugar metabolism?

Which of the following diseases is caused by a protozoan?

Outbreeding is an important strategy of animal husbandry because it :

A childless couple can be assisted to have a child through a technique called GIFT. The full form of this techniques is :

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is :

The structures that help some bacteria to attach to rocks and/or host tissue are :

If you suspect major deficiency of antibodies in a person, to which of the following would you like for confirmation evidence?

In human females, meiosis-II is not completed until?

Which of the following layers in an antral follicle is acellular?

In his classic experiments on pea plants, Mendel did not use :

Which one of the following fruits is parthenocarpic?

In angiosperms, microsporogensis and megasporogenesis:

A gene showing codominance has :

The chitinous exoskeleton of arthropods is formed by the polymerization of :

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to :

The wings of a bird and the wings of an insect are :

Flowers are unisexual in

Increase in concentration of the toxicant at successive trophic levels is known as :

Destruction of the anterior horn cells of the spinal cord would result in loss of :

Roots play insignificant role in absorption of water in : www.vedantu.com 10

Identify the correct order of organization of genetic material from largest to smallest : www.vedantu.com 6

Which one of the following hormones though synthesised elsewhere, is stored and release by the master gland?

Read the different components from (a) to (d) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem : (a) Secondary cortex (b) Wood (c) Secondary phloem (D) Phellem

Which of the following joints would allow no movement?

Which one of the following is not applicable to RNA?

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when :

During ecological succession :

In the following human pedigree, the filled symbols represents the affected individuals. Identify the type of given pedigree.

Balbiani rings are sites of:

Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

Which of the following are most suitable indicators of 𝑆𝑂2 Pollution in the environment?

Satellite DNA is important because it:

Industrial melanism is an example of :

A column of water within xylem vessels of tall trees does not break under its weight because of :

The introduction of t-DNA into plants involves :

Pick up the wrong statement :

In photosynthesis, the light-independent reactions take place at :

Which of the following immunoglobulins does constitute the largest percentage in human milk?

Which of the following pairs is not correctly matched? Mode of eproduction Example

The UN conference Parties in climate change in the year 2012 was held at :

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:

The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil?

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is :

The Young’s modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ration of:

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E0 and a resistance r1. An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by:

A particle is executing a simple harmonic motion. Its maximum acceleration is α and maximum velocity is β. Then, its time period of vibration will be:

If vectors A⃗⃗ =cosωtiî+sinωt ĵ and B⃗⃗ =cos ωt 2î+sin ωt 2 ĵ are functions of times, then the value of t at which they are orthogonal to each other is:

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4 ms−1 at an angle of 60o with th e source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330 ms−1), is:

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber m2⁄ . The coil carries a current of 2A. if the plane of the coil is inclined at an angle of 30o with the direction of the field, the torque required to keep coil in stable equilibrium will be:

A parallel plate air capacitor has capacity ‘C’, distance of separation between plates is ‘d’ and potential difference ‘V’ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is:

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of a being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density if B. The ratio of molecular weight of A and B is:

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,

In the given figure, a diode D is connected to an external resistance R= 100 Ω and an e.m.f. of 3.5 V. If the barrier poten tial developed across the diode is 0.5 V, the current in the circuit will be:

The position vector of a particle R⃗⃗ as a function of time is given by: R⃗⃗ =4 sin(2πt)î+4cos (2πt)ĵ Where R is in meters, t is in seconds and î and ĵ denote unit vectors along x- and y-directions, respectively. Which one of the following statements is wrong for the motion of particle?

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequency for this string is:

Point masses 𝑚1 and 𝑚2 are placed at the opposite ends of rigid rod of length L, and negligible mass. The rod is to be set rotating about an axis perpendicular to it. The position of point P on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity 𝜔0 is minimum, is given by:

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:

A force F⃗ =αî+3ĵ+6k̂ is acting at a point r =2î−6ĵ−12k̂. The value of α for which angular momentum about origin is conserved is:

Two particles A and B move with constant velocities v⃗ 1 and v⃗ 2. At the initial moment their position vectors r 1 and r 2 respectively. The condition for particles A and B for their collision is:

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then: www.vedantu.com 40

Two metal wires of identical dimensions are connected in series. If v1 and v2 are the conductivities of the metal wires respectively, the effective conductivity if the combination is:

Light of wavelength 500 nm is incident on a metal with work function 2.258 eV. The de Broglie wavelength of the emitted electron is:

4.0 g of a gas occupies 22.4 liters at NTP. The specific heat capacity of the gas at constant volume is 5.0 JK−1 mol−1. If the speed of sound in this gas at NTP is 952 ms−1, then the heat capacity at constant pressure is (Take gas constant R=8.3 JK−1 mol−1)

A series R-C circuit is connected to an alternating voltage source. Consider two situations: i. When capacitor is air filled. ii. When capacitor is mica filled. Current through resistor is i and voltage across capacitor is V then:

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with thehorizontal reaches 30o, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be, respectively:

Two stones of masses ma and 2 m are whirled in horizontal circles, the heavier one in a radius r 2 and the lighter one in radius r. the tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is:

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is −20oC, the temperature of the surrounding to which is rejects heat is:

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v₀. It collides with the ground, loses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v₀ is: (Take g = 10 ms⁻²)

On a frictionless surfaces, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle θ to its initial direction and has a speed v 3. The second block’s speed after the collision is:

If p otential (in volts) in a region is expressed as V(x,y,z)=6xy−y+2yz , the electric field (in N/C) at point (1, 1, 0) is:

Two slits in Young’s experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, Imax Imin is:

The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6×103 kg m3⁄ and g= 10 m s2⁄ then the power of heart in watt is:

A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. if the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be:

The input signal given to a CE amplifier having a voltage gain of 150 is Vi=2cos(15t+ π 3). The corresponding output signal will be:

If dimensions of critical velocity vc of a liquid flowing through a tube are expressed as [ηxρyrz], where η,ρ and r are the coefficient of viscosity of liquid, density of liquid and radius of the tube respectively, then the values of x, y and z are given by:

A circuit contains an ammeter, a battery of 30 v and a resistance 40.8 ohm all connected in series. If the ammeter has coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be:

Water rises to a height ‘h’ in capillary tube. If the length of capillary tube above the surface of water is made less than ‘h’, then:

In an astronomical telescope in normal adjustment a straight black line of the length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I. The magnification of the telescope is:

The value of coefficient of volume expansion of glycerin is 5× 10−4K−1. The fractional change in the density of glycerin for a rise of 40oC in its temperature is:

A photoelectric surface is illuminated successively by monochromatic light of wavelength 𝜆 and 𝜆 2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is: (h = Planck’s constant, c = speed of light)

A b eam of light consisting of red, green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39,1.44 and 1.47 respectively. The prism will: