AIPMT 2012
Previous Year Questions

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 a sex-linked recessive disease. How many of the above statements are right?

How many organisms in the list given below are autotrophs? Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter, Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Wolffia

How many plants in the list given below have marginal placentation? Mustard, Gram, Tulip, Asparagus, Arhar, Sunhemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco

As compared to a dicot root, a monocot root has:

A test cross is carried out to:

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

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

In genetic engineering, the antibiotics are used:

The secretory phase in the human menstrual cycle is also called:

In gobar gas, the maximum amount is that of:

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

Which one of the following human organs is often called the “Graveyard” of RBC’s?

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

The idea of mutations was brought forth by:

Select the correct statements about biodiversity:

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

Consider the following four statements (a-d) and select the option which includes all the correct ones only: (a) Single cell protein 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 very rich source of vitamin C (d) A rice variety has been developed which is very rich in calcium

Which one of the following biomolecules is correctly characterised?

For its action, nitrogenase requires:

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

Where do certain symbiotic microorganisms normally occur in human body?

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

Which one of the following cellular parts is correctly described?

Cuscuta is an example of:

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

Read the following five statements (A-B) 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 oogamous (e) The spores of slime molds lack cell walls How many of the above statements are correct?

Identify the molecules (A) and (B) shown below and select the right option giving their source and use:

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?

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

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

Vernalisation stimulates flowering in:

Green revolution in India occurred during:

A fall in glomerular filtration rate (GFR) activates:

What is the function of germ pore?

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 items in the options 1–4 are correctly categorized with one exception in it?

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

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

Read the following four statements (A–D): (A) Colostrum is recommended for the new born because it is rich in antigens (B) Chikungunya 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 statements are wrong?

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

The second stage of hydrosere is occupied by plants like:

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

Which one of the following represents a palindromic sequence in DNA?

For its activity, Carboxypeptidase requires:

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

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

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

The domestic sewage in large cities:

Which one of the following pairs is wrongly matched?

What is it that forms the basis of DNA fingerprinting?

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

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

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?

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

The first clinical gene therapy was given for treating:

Sacred groves are specially useful in:

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

Biolistics (gene-gun) is useful for:

Which one of the following statements is wrong?

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

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

During change of O₂ to O₂⁻ ion, the electron adds on which one of the following orbitals?

Consider the reaction: RCHO + NH₂NH₂ → RCH = N – NH₂ What sort of reaction is it?

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

The Gibbs energy for the decomposition of Al₂O₃ at 500°C is as follows: $$\frac{2}{3}Al_2O_3 \rightarrow \frac{4}{3}Al + O_2$$ $$\Delta_r G = +960\,kJ\,mol^{-1}$$ The potential difference needed for the electrolytic reduction of aluminium oxide (Al₂O₃) at 500°C is at least:

Given that the equilibrium constant for the reaction $$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$$ 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? $$SO_3(g) \rightleftharpoons SO_2(g) + \frac{1}{2}O_2(g)$$

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

Molar conductivities (Λₘ°) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. Λₘ° for CH₃COOH will be :

Vapour pressure of chloroform (CHCl₃) and dichloromethane (CH₂Cl₂) at 25°C are 200 mmHg and 41.5 mmHg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl₃ and 40 g of CH₂Cl₂ at the same temperature will be:

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

Which one of the following sets forms the biodegradable polymer?

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

Given the reaction between two gases represented by A₂ and B₂ to give the compound AB: $$A_2(g) + B_2(g) \rightleftharpoons 2AB(g)$$ At equilibrium, the concentration: $$[A_2] = 3.0 \times 10^{-3} M$$ $$[B_2] = 4.2 \times 10^{-3} M$$ $$[AB] = 2.8 \times 10^{-3} M$$ If the reaction takes place in a sealed vessel at 527°C, then the value of (KC) will be:

Standard reduction potentials of the half reactions are given below: $$F_2(g) + 2e^- \rightarrow 2F^-_{(aq)} ; E^0 = +2.85V$$ $$Cl_2(g) + 2e^- \rightarrow 2Cl^-_{(aq)} ; E^0 = +1.36V$$ $$Br_2(l) + 2e^- \rightarrow 2Br^-_{(aq)} ; E^0 = +1.06V$$ $$I_2(s) + 2e^- \rightarrow 2I^-_{(aq)} ; E^0 = +0.53V$$ The strongest oxidizing and reducing agents respectively are:

For diatomic species listed below, identify the correct order in which the bond order is increasing in them:

Low spin complex of (d$^6$) cation in an octahedral field will have the following energy: Δ₀ = crystal field splitting energy in octahedral field, (P) = electron pairing energy)

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

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

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

Chloroamphenicol is an:

Consider the following reaction: The product 'A' is:

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

For real gases van der Waals equation is written as $$\left(p + \frac{an^2}{V^2}\right)(V-nb)=nRT$$ where 'a' and 'b' are van der Waals constants. Two sets of gases are: (I) O₂, CO₂, H₂ and He (II) CH₄, O₂ and H₂ 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:

Activation energy (Eₐ) and rate constants (k₁ and k₂) of a chemical reaction at two different temperatures (T₁ and T₂) related by :

Which of the following exhibits only +3 oxidation state?

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:

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:

Four successive members of the first series of the transition metals are listed below. For which one of the standard potential (E°M²⁺⁄M) value has a positive sign?

In the replacement reaction $$Cl + MF \rightarrow CF + MI$$ The reaction will be most favourable if M happens to be:

An organic compound (C₃H₉N) (A), when treated with nitrous acid, gave an alcohol and N₂ gas was evolved. (A) on warming with CHCl₃ and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure of (A).

The instantaneous values of alternating current and voltage in a circuit are given as $$i=\frac{1}{\sqrt{2}}\sin(100\pi t)\,\text{A}$$ and $$e=\frac{1}{\sqrt{2}}\sin\left(100\pi t+\frac{\pi}{3}\right)\,\text{V}$$. The average power consumed in the circuit is:

The power dissipated in the circuit shown in the figure is 30 watts. The value of resistance R is:

The dimensions of $\left(\mu_0\varepsilon_0\right)^{-1/2}$ are:

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:

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

Two metallic spheres of radii 1 cm and 3cm are given charges $-1\times10^{-2}\,\text{C}$ and $5\times10^{-2}\,\text{C}$ respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is:

Two radiations of photon energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:

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

A train moving at a speed of 220 ${m s}^{-1}$ towards a stationary object emits a sound of frequency $1000\,\text{Hz}$. Some of the sound reaching the object gets reflected back 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 ${m s}^{-1}$)

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

A car of mass m is moving on a level circular track of radius R. If $\mu_s$ 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 circular platform is mounted on a frictionless vertical axle. Its radius is R = 2 m and its moment of inertia about the axle is 200 ${kg m}^2$. A man of mass 50 kg stands on the edge of the platform and begins to walk along the edge at the speed of 1 ${m s}^{-1}$ relative to the ground. Time taken by the man to complete one revolution is:

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 electrons will be:

If $v_e$ is the escape velocity and $v_o$ is the orbital velocity of a satellite of orbit close to the Earth's surface, then these are related by:

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

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

Three masses are 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: