Official NEET UG 2012 (B1)

Vapour pressure of chloroform (CHCl\(_{3}\) ) and dichloromethane (CH\(_{2}\)Cl\(_{2}\) ) at 25\(^{°}\)C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl\(_{3}\) and 40 g of CH\(_{2}\)Cl\(_{2}\) at the same temperature will be: (Molecular mass of CHCl\(_{3}\) = 119.5 u and molecular mass of CH\(_{2}\)Cl\(_{2}\) = 85 u)

The Gibbs energy for the decomposition of \(Al_{2}O_{3} at 500^{°}\)C is as follows:

The potential difference needed for the electrolytic reduction of aluminium oxide \((Al_{2}O_{3} ) at 500^{°}C\) at least

Four successive members of the first series of the transition metals are listed below. For which one

of them the standard potential \((^{0}E_{M}^{2+}\)/M) value has a positive sign?

Which of the following exhibits only +3 oxidation state?

Molar conductivities\((^{0}\wedge_{m})\) at infinite dilution of NaCl, HCl and CH\(_{3}\)COONa are 126.4, 425.9 and 91.0 S cm\(^{2} mol^{–1} respectively.^{0}\wedge_{m} for CH_{3}\)COOH will be:

In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

Consider the reaction:

What sort of reaction is it?

During change of \(O_{2} to ^{-}O_{2} \)ion, the electron adds on which one of the following orbitals?

Standard reduction potentials of the half reactions are given below:

The strongest oxidising and reducing agents respectively are:

The catalytic activity of transition metals and their compounds is ascribed mainly to

Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats \((C_{p} /C_{v} )\) of the mixture will be

Given that the equilibrium constant for the reaction

has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature.

Which one of the following sets forms the bidegradable polymer?

In the replacement reaction

The reaction will be most favourable if M happens to be:

Activation energy \((E_{a} )\) and rate constants \((k_{1} and k_{2} ) \)of a chemical reaction of two different temperatures \((T_{1}\) and \(T_{2}\) ) are related by:

Which one of the following does not correctly represent the correct order of the property indicated against it?

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true?

An organic compound (C\(_{3}\)H\(_{9}\)N) (A), when treated with nitrous acid, gave an alcohol and N\(_{2}\) gas was evolved. (A) on warming with CHCl\(_{3}\) and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure (A).

Structure of a mixed oxide is cubic close-packed (c.c.p). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is:

The orbital angular momentum of a p-electron is given as:

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them:

Which of the following compounds can be used as antifreeze in automobile radiators?

For real gases van der Waals equation is written as

The gases given in set-I in increasing order of ‘b’ and gases given in set-II in decreasing order of ‘a’, are arranged below. Select the correct order from the following:

A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:

Consider the following reaction:

The product ‘A’ is

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

Which of the following compounds will give a yellow precipitate with iodine and alkali?

Chloroamphenicol is an:

Given the reaction between 2 gases represented by\( A_{2}\) and \(B_{2}\) to give the compound \(AB_{(g)}\).

If the reaction takes place in a sealed vessel at \(527^{°}\)C, then the value of \(K_{c}\) will be:

Low spin complex of d\(_{6}\) – cation in an octahedral field will have the following energy:

n the five-kingdom classification, Chlamydomonas and Chlorella have been included in

Indentify the likely organisms (a), (b) (c) and (d) in the food web shown below

A test cross is carried out to

Read the following five statements (A – E) and answer as asked next to them

(A) In Equisetum the female gametophyte is retained on the parent sporophyte

(B) In Ginkgo male gametophyte is not independent

(C) The sporophyte in Riccia is more developed than that in Polytrichum

(D) Sexual reproduction in Volvox is isogamous

Which one of the following human organs is often called the “graveyard” of RBCs ?

Which one of the following generally acts as an antagonist to gibberellins ?

Tobacco plants resistant to a nematode have been developed by the introduction of DNA that produced (in the host cells).

How many plants in the list given below have marginal placentation ?

Mustard, Gram, Tulip, Asparagus, Arhar, Sun hemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco, Lupin

For its activity, carboxypeptidase requires

The second stage of hydrosere is occupied by plants like

Which one of the following structures is an organelle within an organelle ?

In gobar gas, the maximum amont is that of

The first clinical gene therapy was given for treating

Which one of the following biomolecules is correctly characterised ?

Green revolution in India occurred during

Cuscuta is an example of

Consider the following four statements (a–d) and select the option which includes all the correct ones only

(a) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc

(b) Body weight-wise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day

(c) Common button mushrooms are a very rich source of vitamin C

(d) A rice variety has been developed which is very rich in calcium

How many organisms in the list given below are autotrophs ?

Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Sacharomyces, Trypanosoma, Porphyra, Walfia

Which one of the following categories of animals, is correctly described with no single exception in it ?

The four sketches (A, B, C and D) given below, represent four different types of animal tissues. Which one of these is correctly identified in the options given, along with its correct location and function ?

Given below is the diagrammatic sketch of a certain type of connective tissue. Identify the parts labelled A, B, C and D, and select the right option about them

Sacred groves are specially useful in

The figure below shows three steps (A, B, C) of Polymerase Chain Reaction (PCR). Select the option giving correct identification together with what it represents ?

The rate of formation of new organic matter by rabbit in a grassland, is called

Which one of the following organisms is scientifically correctly named, correctly printed according to the International Rules of Nomenclature and correctly described ?

Which one of the following represents palindromic sequence in DNA ?

Vernalisation stimulates flowering in

Which one of the following statements is correct with respect to immunity ?

Which one of the following sets of items in the options 1 – 4 are correctly categorised with one exception in it ?

Which one of the following pairs is wrongly matched ?

Which one of the following is a wrong statement regarding mutations ?

Read the following four statements (A – D)

(A) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane

(B) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth

(C) Stamens in flowers of Gloriosa and Petunia are polyndrous

(D) Symbiotic nitrogen-fixers occur in free-living state also in soil How many of the above statements are right ?

Where do certain symbiotic microorganisms normally occur in human body ?

The secretory phase in the human menstrual cycle in also called

Biolistics (gene-gun) is suitable for

A fall in glomeruclar filtration rat (GFR) activates

Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern ?

Which one of the following cellular parts is correctly described ?

Which one of the following options gives the correct categorisation of six animals according to the type of nitrogenous wastes (A, B, C), they give out ?

Which one of the following characteristics is common both in humans and adult frogs ?

Identify the human developmental stage shown below as well as the related ritght palce of its occurrence in a normal pregnant woman, and select the right option for the two together.

What is the function of germ pore ?

For its action, nitrogenase requires

In genetic engineering, the antibiotics are used

Through their effect on plant growth regulators, what do the temperature and light control in the plants?

What is it that forms the basis of DNA fingerprinting ?

Select the correct statements bout biodiversity

The domestic sewage in large cities

Plants with ovaries having only one or a few ovules, are generally pollinated by

Read the following four statements (A – D)

(A) Colostrum is recommended for the new born because it is rich in antigens

(B) Chikengunya is caused by a Gram negative bacterium

(C) Tissue culture has proved useful in obtaining virus-free plants

(D) Beer is manufactured by distillation of fermented grape juice How many of the above statement are worng ?

The supportive skeletal structures in the human external ears and in the nose tip are examples of

As compared to a dicot root, a monocot root has

Which one of the following organisms is correctly matched with its three characteristics ?

Which one of the following pairs of chemical substances, is correctly categorised ?

Indenfity the molecules (a) and (b) shown below and select the right option giving their source and use

Indentify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres

Which one of the following statements is worng ?

The idea of mutations was brought forth by

Read the following four statements (A – D)

(A) In transcription, adenosine pairs with uracil

(B) Regulation of lac operon by repressor is referred to as positive regulation

(C) The human genome has approximately 50,000 genes

(D) Haemophilia is sex-linked recessive disease

How many of the above statements are right ?

Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them ?

Two metallic spheres of radii 1 cm and 3 cm are given charges of –1 × \(10^{–2} C and 5 × 10^{–2}\) C, respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in uniform magnetic field. What should be the energy of an \(\alpha-particle\) to describe a circle of same radius in the same field?

A circular platform is mounted on a frictionless vertical axle. Its radius R = 2 m and its moment of inertia about the axle is 200 kg \(m_{2}\) . It is initially at rest. A 50 kg man stands on the edge of the platform and begins to walk along the edge at the speed of 1 ms\(^{–1}\) relative to the ground. Time taken by the man to complete one revolution is

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to

A magnetic needle suspended parallel to a magnetic field requires \(\sqrt{3}\) J of work to turn it through 60°. The torque needed to maintain the needle in this position will be

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away for the mirror. The length of the image is

The moment of inertia of uniform circular disc is maximum about an axis perpendicular to the disc and passing through

Which one of the following plots represents the variation of gravitational field on a particle with distance r due to a thin spherical shell of radius R? (r is measured from the centre of the spherical shell)

To get an output Y = 1 in given circuit which of the following input will be correct:

The equation of a simple harmonic wave is given by \(Y = 3sin\frac{\pi}{2}(50t-x)\) where x and y are in metres and t is in seconds. The ratio of maximum particle velocity to the wave velocity is

A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in the capacitor is

The power dissipated in the circuit shown in the figure is 30 Watts. The value of R is

If\( v_{e} v_{o} \) is orbital velocity of a satellite for orbit close tot he earth’s surface, then these are related by

A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by

An ideal gas goes from state A to state B via three different processes as indicated in the P-V diagram If \(Q_{1} , Q_{2} , Q_{3}\) indicate the heat absorbed by the gas along the three processes and \(\Delta U_{1} , \Delta U_{2} , \Delta U_{3}\) indicate the change in internal energy along the three processes respectively, then

Two radiations of photons energies 1 eV and 25 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is

For the angle of minimum deviation of a prism to be equal to its refracting angle, the prism must be made of a material whose refractive index

If the momentum of an electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%. The initial momentum of electron will be

Three masses the placed on the x-axis 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70 cm. The distance of the centre of mass from the origin is

A car of mass m is moving on a level circular track of radius R. If \(\mu_2\) represents the static friction between the road and tyres of the car, the maximum speed of the car in circular motion is given by

A slab of stone of area 0.36 m\(^2\) and thickness 0.1 m is exposed on the lower surface to steam at 100°C. A block of ice at 0°C rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is (Given latent heat of fusion of ice = 3.36 × 105 J kg\(^{-1}\))

In a coil of resistance of 10\(\Omega\), the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil in Weber is

A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude Po. The instantaneous velocity of this car is proportional to

A train moving at a speed of 220 ms\(^{-1}\) towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected black to the train as echo. The frequency of the echo as detected by the driver of the train is: (speed of sound in air is 330 ms\(^{-1}\))

The input resistance of a silicon transistor is 100 \(\Omega\). Base current is changed by 40 mA, which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4 k\(\Omega\). The voltage gain of the amplifier is

A cell having an emf \(\varepsilon\) and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

The dimensions of \((\mu_o\varepsilon_o )^{-1/2}\) are

The half life of a radioactive nucleus is 50 days. The time interval \((t_2 – t_1)\)between the time \(t_2\) when \(\frac{3}{2}\)of it has decayed and the time \(t_1\) when \(\frac{1}{3}\) of it had decayed is:

The instantaneous values of alternating current and voltages in a circuit are given as

\(i = \frac{1}{\sqrt{2}}sin (100\pi t)\) ampere

\(e = \frac{1}{\sqrt{2}}sin (100\pi t+\frac{\pi}{3})\) volt

The average power in Watts consumed in the circuit is

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from