Official NEET UG 2013

In Young’s double slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths \(\lambda _1\)= 12000\(Å\) and \(\lambda _2\) = 10000\(Å\).  At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?

In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be :

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is : (given 1u = 931 MeV)

In the given (V – T) diagram, what is the relation between pressure P\(_1\) and P \(_2\) ?

The output (X) of the logic circuit shown in figure will be :

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

In a n-type semiconductor, which of the following statement is true:

The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be:

The molar specific heats of an ideal gas at constant pressure and volume are denoted by C\(_P\) and C\(_V\), respectively. If \( \gamma = \frac{C_P}{C_V}\) and R is the universal gas constant, then C\(_V\)  is equal to :

The wavelength \( \lambda _e\) of an electron and \(\lambda _P\) of a photon of same energy E are related by:

Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is:-

A current loop in a magnetic field :-

A, B and C are three points in a uniform electric field. The electric potential is :-

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is :-

A wire of resistance 4\(\Omega  \)is stretched to twice its original length. The resistance of stretched wire would be :-

The velocity of a projectile at the initial point A is \((2 \hat{2} + 3\hat{j})\) m/s. It’s velocity (in m/s) at point B is :-

A body of mass ‘m’ is taken from the earth’s surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be :-

A stone falls freely under gravity. It covers distances h\(_1\), h\(_2\) and h\(_3\) in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between h\(_1\), h\(_2\) and h\(_3\) is :-

A bar magnet of length ‘\(l \)’ and magnetic dipole moment ‘M’ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10\(\Omega  \) is

For photoelectric emission from certain metal the cutoff frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) :-

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of \(\frac{C_P}{C_V}\) for the gas is :-

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

The resistances of the four arms P,Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be :-

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T\(_1\) K to T\(_2\) K is :-

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using :-

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is :-

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms\(^{–1}\) and the second part of mass 2 kg moves with 8 ms\(^{–1}\) speed. If the third part files off with 4 ms\(^{–1}\) speed, then its mass is :-

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows \( P = \frac{a^3 b^2}{cd}\) % error in P is :-

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of :

Select the correct statement with respect to locomotion in humans:

A phosphoglyceride is always made up of :

Perisperm differs from endosperm in:

A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is :

The cell-mediated immunity inside the human body is carried out by :

Which of the following are likely to be present in deep sea water ?

One of the representatives of Phylum Arthropoda is :

Megasporangium is equivalent to :

Kyoto Protocol was endorsed at :

Figure shows human urinary system with structures labelled A to D. Select option which correctly identifies them and gives their characteristics and/ or functions.

In china rose the flowers are :

The Golgi complex plays a major role :

What external changes are visible after the last moult of a cockroach nymph?

Isogamous condition with non-flagallated gametes is found in

Transition state structure of the substrate formed during an enzymatic reaction is

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom :

The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of :

Monoecious plant of Chara shows occurrence of :

Advantage of cleistogamy is :-

The H-zone in the skeletal muscle fibre is due to :

Artificial insemination means :

Which group of animals belong to the same phylum?

Seed coat is not thin, membranous in :

If two persons with ‘AB’ blood group marry and have sufficiently large number of children, these children could be classified as ‘A’ blood group : ‘AB’ blood group ‘B’ blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both ‘A’ and ‘B’ type proteins in ‘AB’ blood group individuals. This is an example of

Which of the following cannot be detected in a developing foetus by amniocentesis ?

The first stable product of fixation of atmospheric nitrogen in leguminous plants is :

A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

Secondary productivity is rate of formation of new organic matter by :

Infection of Ascaris usually occurs by :

A small object of uniform density rolls up a curved surface with an initial velocity ‘v’. It reaches upto a maximum height of \(\frac{3v^2}{4g}\) with respect to the initial position. The object is

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices \( \mu _1\) and \( \mu _2\) and R is the radius of curvature of the curved surface of the lenses, then the focal length of combination is

A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea -eye lens can be estimated to be –

The upper half of an inclinded plane of inclination \(\theta \) is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by:-

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength 2\( \pi \)m and frequency of \(\frac{1}{\pi}\) Hz is represented by :

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz, The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz, The unknown frequency is

A coil is self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when :

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become :

If we study the vibration of a pipe open at both ends, then the following statement is not true :

When a proton is released from rest in a room, it starts with an initial acceleration a\(_0\) towards west. When it is projected towards north with a speed v\(_0\) it moves with an initial acceleration 3a\(_0\) towards west. The electric and magnetic fields in the room are:

A wire loop is rotated in magnetic field. The frequency of change of direction of the induced e.m.f. is :

A uniform force of (3\(\hat{i}\) + \(\hat{j}\)) newton acts on a particle of mass 2kg. Hence the particle is displaced from osition  (2\(\hat{i}\)  + \(\hat{k}\) ) meter to position  (4\(\hat{i}\)  + 3\(\hat{j}\) – \(\hat{k}\) ) meter. The work done by the force on the particle is :-

The wettability of a surface by a liquid depends primarily on :-

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1m, 2m, 4m, 8m, …., respectively, from the origin. The resulting gravitational potential due to this system at the origin will be :

The value of Planck’s constant is 6.63 × 10\(^{-34}\) Js. The speed of light is 3 × 10\(^{17}\) nm s\(^{–1}\). Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 × 10\(^{15}\) s\(^{–1}\) ?

Which of the following is electron-deficient ?

Which of the following lanthanoid ions is diamagnetic?
(Atoms, Ce = 58, Sm = 62, Yb = 70)

Which one of the following molecules contains no \(\pi \) bond ?

Based on equation E = –2.178 × 10\(^{–18}\) J \((\frac{Z^2}{n^2})\) certain conclusions are written. Which of them is not correct ?

In the reaction

The order of stability of the following tautomeric compounds is :-

Nylon is an example of :-

XeF\(_2\) is isostructural with :-

The basic structural unit of silicates is :-

Which of the following structure is similar to graphite?

The structure of isobutyl group in an organic compound is :-

The number of carbon atoms per unit cell of diamond unit cell is :-

An excess of AgNO\(_3\) is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium(III) chloride. The number of moles of AgCl precipitated would be :-

What is the maximum numbers of electrons that can be associated with the following set of quantum numbers ?
n = 3, l = 1 and , = –1

Which of these is not a monomer for a high molecular mass silicone polymer ?

A reaction having equal energies of activation for forward and reverse reactions has :-

At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm\(^{–1}\) cm\(^2\) mol\(^{–1}\) and at infinite dilution its molar conductance is 238 ohm\(^{–1}\) cm\(^2\) mol\(^{–1}\). The degree of ionisation of ammonium hydroxide at the same concentration and temperature is :-

Structure of the compound whose IUPAC name is 3–Ethyl–2–hydroxy–4–methylhex–3–en–5–ynoic acid is :-

Among the following ethers, which one will produce methyl alcohol on treatement with hot concentrated HI ?

Antiseptics and disinfectants either kill or prevent growth of microganisms. Identify which of the following statements is not true :-

A magnetic moment of 1.73 BM will be shown by one among the following :-

KMnO\(_4\) can be prepared from K\(_2\)MnO\(_4\) as per the reaction:-

The reaction can go to compition by removing OH\(^–\) ions by addings :-

Reaction by which Benzaldehyde cannot be prepared :-

Which of the following does not give oxygen on heating ?

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72g cm\(^{–3}\). The molar mass of the metal is :-

Dipole induced dipoloe interactions are present in which of the following pairs :-

Figure shows schematic plan of blood circulation in humans with labels A to D, Identify the label and give its function/s.

The tendency of population to remain in genetic equilibrium may be disturbed by :

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A-D.

A good producer of citric acid is :

Age of a tree can be estimated by :

The process by which organisms with different evolutionary history evolve similar phenotypic adaptation in response to a common environmental challenge, is called :

A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characterstics.

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic :-

Interfascicular cambium develops from the cells of:

During seed germination its stored food is mobilized by :

Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smel of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. It aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is :-

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

Nitrobenzene on reaction with conc. HNO\(_3\)/H\(_2\)SO\(_4\) at 80-100°C forms which one of the following products ?

A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be ?

Which of the following is a polar molecule ?

A button cell used in watches function as following

Zn(s) + Ag\(_2\)O(s) + H\(_2\)O(\(l\)) \(\rightleftharpoons \) 2Ag(s) +
Zn\(^{2+}\)(aq) + 2OH\(^–\) (aq)

If half cell potentials are

Zn\(^{2+}\)(aq) + 2e\(^–\) \(\to \) Zn(s); E\(^o\) = –0.76V

Ag\(_2\)O(s) + H\(_2\)O(\(l\)) + 2e\(^-\) \(\to \) 2Ag(s) + 2OH\(^-\) (aq);

E° = 0.34V
The cell potential will be :-

Which of these is least likely to act as a Lewis base?

Which of the following compounds will not undergo Friedal-Craft’s reaction easily :-

Which is the monomer of Neoprene in the following ?

6.02 × 10\(^{20}\) molecules of urea are present in 100mL of its solution. The concentration of solution is :-

Maximum deviation from ideal gas is expected from :

Which of the following is paramagnetic ?

Identify the correct order of solubility in aqueous medium :

What is the activation energy for a reaction it its rate doubles when the temperature is raised from 20°C to 35°C ? (R = 8.314 J mol\(^{–1}\) K\(^{–1}\))

Which is the strongest acid in the following ?

Meiosis takes place in :

According to Darwin, the organic evolution is due to :

Which of the following criteria does not pertain to facillitated transport ?

A major site for synthesis of lipids is :

Natural reservoir of phosphorus is :

Which of the metabolites is common to respiration- mediated breakdown of fats, carbohydrates and proteins ?

Which one of the following processes during decomposition is correctly described ?

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

Which of the following statements is not true of two genes that show 50% recombination frequency ?

One of the legal methods of birth control is :

Besides paddy fields, cyanobacteria are also found inside vegetative part of :

Which of the following are correctly matched with respect to their taxonomic classification ?

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :

Select the correct match of the digested products in humans given in  with their absorption site and mechanism.

Select the wrong statement :

Which Mendelism idea is depicted by a cross in which the F\(_1\) generation resembles both the parents ?

The diagram given here is the standard ECG of a normal person. The P- wave represents the :

Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene ?

The most abundant intracellular cation is :

Which one of the following is not the function of placenta ? It :-

In plant breeding programme, the entire collection (of plants/seeds) having all the diverse alleles for all genes in a given crop is called :

Which one of the following is not a correct statements ?

Which one of the following organelle in the figure correctly matches with its function ?

Which of the following represents maximum number of species among global biodiversity ?

Which of the following Bt crops is being grown in India by the farmers ?

Read the following statements (A – E) and answer the question which follows them.

(a) In liverworts, mosses and ferns gametophytes are free living

(b) Gymnosperms and some ferns are heterosporous

(c) Sexual reproduction in Fucus, Volvox and Allbugo is oogamous

(d) The sporophyte in liverworts is more elaborate than that in mosses

(E) Both, Pinus and Marchantia are dioecious

How many of the above statements are correct ?

The essential chemical components of many coenzymes are :

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics:-

The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.

Arrow numberd 4, 8 and 12 can all be :

Pigment-containing membranous extensions in some cyanobacteria are :

Which one of the following statements is correct ?

The characteristics and an example of a synovial joint in humans is :-

The Air Prevention and Control of Pollution Act came into force in :

Product of sexual reproduction generally generates:

Among bitter gourd, mustard, brinjal, pumpkin chinarose, lupin, cucumber, sunnhemp, gram, guava, bean, chilli, plum, petunia, tomato, rose, withania, potato, onion, aloe and tulip how many plants have hypogynous flower ?

A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of :

Which of the following is not correctly matched for the organism and its cell wall degrading enzyme?

Menstrual flow occurs due to lack of :

Global warming can be controlled by :

Which one of the following is not used for ex situ plant conservation ?

During sewage treatment, biogases are produced which include :

The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C :

DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by :

The complex formed by a pair of synapsed homologous chromosomes is called :

The incorrec t statement with regard to Haemophilia is :

Which of the following statements is correct in relation to the endocrine system ?

Lenticels are involved in :

Match the name of the animal (column I), with one characteristics (column II), and the phylum/class (column III) to which it belongs :

What is the correct sequence of sperm formation?

Macro molecule chitin is :