Neet PYQ 2007

Passage cells are thin-walled cells found in:

The opening of floral buds into flowers is a type of:

Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they:

Identify the odd combination of the habitat and the particular animal concerned.

In the leaves of $C_4$ plants, malic acid formation during ${\text{CO}}_2$ fixation occurs in the cells of:

A human male produces sperms with the genotypes AB, Ab, aB and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?

Which of the following ecosystem types has the highest annual net primary productivity?

In human body, which one of the following is anatomically correct?

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

One of endangered species of Indian medicine plants is that of:

In the hexaploid wheat, the haploid ($n$) and basic ($x$) numbers of chromosomes are:

In cloning of cattle a fertilized egg is taken out of the mother's womb and:

Which one of the following statements is correct?

One of the important consequences of geographical isolation is:

Flagellated male gametes are present in all the three of which one of the following sets?

Molecular basis of organ differentiation depends on the modulation in transcription by:

Increased asthmatic attacks in certain seasons are related to:

Which of the following is a slime mould?

Which one of the following is an example of negative feedback loop in humans?

Ergot of rye is caused by a species of:

Geometric representation of age structure is a characteristic of:

Which one of the following mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically?

Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoryed building starts climbing down the stairs rapidly. Which hormone initiated this act?

Among the human ancestors the brain size was more than $1000\text{cc}$ in:

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

The wavelength of light absorbed by $P_r$ form of phytochrome is:

Which part of ovary in mammals acts as an endocrine gland after ovulation?

Which one of the following is not a constituent of cell membrane?

The concept of chemical evolution is based on:

In maize, hybrid vigour is exploited by:

In gymnosperms, the pollen chamber represents:

During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result:

Industrial melanism as observed in peppered moth proves that:

"Foolish seedling" disease of rice led to the discovery of:

Differentiation of organs and tissues in a developing organism is associated with:

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is:

Lysozyme that is present in perspiration, saliva and tears, destroys:

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

The Okazaki fragments in DNA chain growth:

The two polynucleotide chains in DNA are:

Which one of the following is a viral disease of poultry?

Inheritance of skin colour in humans is an example of:

One gene-one enzyme relationship was established for the first time in:

A genetically engineered micro-organism used successfully in bioremediation of oil spills is a species of:

In which one of the following preparations are you likely to come across cell junctions most frequently?

Which one of the following pairs is mismatched?

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and:

Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, then $F_2$ segregation will show:

What is common between parrot, platypus and kangaroo?

Which one of the following is being utilized as a source of bio-diesel in the Indian countryside?

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

In the human female, menstruation can be deferred by the administration of:

Select the correct statement from the following:

Two plants can be conclusively said to belong to the same species if they:

A sequential expression of a set of human genes occurs when a steroid molecule binds to the:

In a coal fired power plant electrostatic precipitators are installed to control emission of:

Probiotics are:

Which pair of the following belongs to Basidiomycetes?

Spore dissemination in some liverworts is aided by:

A person who is on a long hunger strike and is surviving only on water, will have:

Which one of the following pairs, is not correctly matched?

A common test to find the genotype of a hybrid is by:

Which one of the following is a matching pair of a body feature and the animal possessing it?

Which of the following pairs are correctly matched?

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

A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?

What is true about Nereis, Scorpion, Cockroach and Silver fish?

The finches of Galapagos islands provide an evidence in favour of:

Two cells A and B are contiguous. Cell A has osmotic pressure $10\text{atm}$, turgor pressure $7\text{atm}$ and diffusion pressure deficit $3\text{atm}$. Cell B has osmotic pressure $8\text{atm}$, turgor pressure $3\text{atm}$ and diffusion pressure deficit $5\text{atm}$. The result will be:

Which one of the following elements is not an essential micronutrient for plant growth?

Male gametes in angiosperms are formed by the division of:

Which one of the following is surrounded by a callose wall?

Which one of the following statements about mycoplasma is wrong?

Which one of the following is not a bioindicator of water pollution?

Select the wrong statement from the following:

Which one of the following pairs of organisms are exotic species introduced in India?

Which one of the following statement is correct?

Bowman's glands are located in the:

The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for:

Compared to a bull, a bullock is docile because of:

What is common to whale, seal and shark?

All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is:

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

Ultrasound of how much frequency is beamed into human body for sonography?

The biological organisation starts with:

Which one of the following pairs is wrongly matched?

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in $F_1$ generation?

Adaptive radiation refers to:

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:

Which one of the following is a fat-soluble vitamin and its related deficiency disease?

ICBN stands for:

If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

A plant requires magnesium for:

The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of:

A high density of elephant population in an area can result in:

A drop of each of the following is placed separately on four slides. Which of them will not coagulate?

For a critical study of secondary growth in plants, which one of the following pairs is suitable:

Calculate the $\text{pOH}$ of a solution at $25{}^{\circ }\text{C}$ that contains $1\times 10^{-10}\text{ M}$ of hydronium ions.

Which of the following will give a pair of enantiomorphs? ($\text{en}={\text{NH}}_2{\text{CH}}_2{\text{CH}}_2{\text{NH}}_2$)

The correct order of increasing thermal stability of ${\text{K}}_2{\text{CO}}_3$, ${\text{MgCO}}_3$, ${\text{CaCO}}_3$ and ${\text{BeCO}}_3$ is:

A weak acid, $\text{HA}$, has a $K_a$ of $1.00\times 10^{-5}$. If $0.100\text{ mole}$ of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to:

The number of moles of ${\text{KMnO}}_4$ that will be needed to react with one mole of sulphite ion in acidic solution is:

Identify the incorrect statement among the following:

Which of the following oxidation states are the most characteristic for lead and tin respectively?

The correct order of $\text{C-O}$ bond length among $\text{CO}$, ${\text{CO}}_3^{2-}$, ${\text{CO}}_2$ is:

Which of the following represents the correct order of the acidity in the given compounds?

The following equilibrium constants are given:

Which one of the following vitamins is water-soluble?

If there is no rotation of plane polarized light by a compound in a specific solvent, thought to be chiral, it may mean that:

Consider the following sets of quantum numbers

Which of the following sets of quantum number is not possible?

Which one of the following ions is the most stable in aqueous solution? (At. No. $\text{Ti}=22,\text{V}=23,\text{Cr}=24,\text{Mn}=25$)

Concentrated aqueous sulphuric acid is $98\%{\text{ H}}_2{\text{SO}}_4$ by mass and has a density of $1.80{\text{ g mL}}^{-1}$. The volume of acid required to make one litre of $0.1{\text{ M H}}_2{\text{SO}}_4$ solution is:

Which one of the following ionic species has the greatest proton affinity to form stable compound?

${\text{CH}}_3{\text{—CHCl—CH}}_2{\text{—CH}}_3$ has a chiral center. Which one of the following represents its $R$ configuration?

$0.5\text{ molal}$ aqueous solution of a weak acid ($\text{HX}$) is $20\%$ ionised. If $K_f$ for water is $1.86{\text{ K kg mol}}^{-1}$, the lowering in freezing point of the solution is:

Which one of the following polymers is prepared by condensation polymerization?

The Langmuir adsorption isotherm is deduced using the assumption:

The reaction of hydrogen and iodine monochloride is given as:${\text{H}}_2(g)+2\text{ICl}(g)\to 2\text{HCl}(g)+{\text{I}}_2(g)$ This reaction is of first order with respect to ${\text{H}}_2(g)$ and $\text{ICl}(g)$. The following mechanisms were proposed:Mechanism A: ${\text{H}}_2(g)+2\text{ICl}(g)\to 2\text{HCl}(g)+{\text{I}}_2(g)$ Mechanism B:${\text{H}}_2(g)+\text{ICl}(g)\to \text{HCl}(g)+\text{HI}(g)$ (slow)$\text{HI}(g)+\text{ICl}(g)\to \text{HCl}(g)+{\text{I}}_2(g)$ (fast)Which mechanism is consistent with the rate law?

$\text{RNA}$ and $\text{DNA}$ are chiral molecules, their chirality is due to:

In which of the following the hydration energy is higher than the lattice energy?

Which one of the following on reduction with lithium aluminium hydride yields a secondary amine?

Consider the following reactions:(i) ${\text{H}}^{+}(aq)+{\text{OH}}^{-}(aq)={\text{H}}_2\text{O}(l)$, $\Delta H=-x_1{\text{ kJmol}}^{-1}$ (ii) ${\text{H}}_2(g)+\frac{1}{2}{\text{O}}_2(g)={\text{H}}_2\text{O}(l)$, $\Delta H=-x_2{\text{ kJmol}}^{-1}$ (iii) ${\text{CO}}_2(g)+{\text{H}}_2(g)=\text{CO}(g)+{\text{H}}_2\text{O}(l)$, $\Delta H=-x_3{\text{ kJmol}}^{-1}$ (iv) ${\text{C}}_2{\text{H}}_2(g)+\frac{5}{2}{\text{O}}_2(g)=2{\text{CO}}_2+{\text{H}}_2\text{O}(l)$, $\Delta H=-x_4{\text{ kJmol}}^{-1}$ The enthalpy of formation of ${\text{H}}_2\text{O}(l)$ is:

Given that bond energy of $\text{H—H}$ and $\text{Cl-Cl}$ is $430{\text{ kJ mol}}^{-1}$ and $240{\text{ kJ mol}}^{-1}$ respectively and $\Delta H_f$ for $\text{HCl}$ is $-90{\text{ kJ mol}}^{-1}$. The bond enthalpy of $\text{HCl}$ is:

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. $\text{HCl}$ is called:

Which one of the following anions is present in the chain structure silicates?

The fraction of total volume occupied by the atoms present in a simple cube is:

For the following anions: (i) ${\text{I}}^{-}$, (ii) ${\text{Cl}}^{-}$, (iii) ${\text{Br}}^{-}$. (Question implies adding (iv) ${\text{F}}^{-}$ based on options). The increasing order of nucleophilicity in a polar protic solvent would be:

The product formed in aldol condensation is:

If $\text{NaCl}$ is doped with $10^{-4}\text{ mol\%}$ of ${\text{SrCl}}_2$, the concentration of cation vacancies will be ($N_A=6.02\times 10^{23}{\text{ mol}}^{-1}$):

The $d$ -electron configurations of ${\text{Cr}}^{2+}$, ${\text{Mn}}^{2+}$, ${\text{Fe}}^{2+}$ and ${\text{Ni}}^{2+}$ are $3d^4$, $3d^5$, $3d^6$ and $3d^8$ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

The order of decreasing reactivity towards an electrophilic reagent for the following: (i) Benzene, (ii) Toluene, (iii) Chlorobenzene, and (iv) Phenol would be:

In which of the following pairs, the two species are isostructural?

If the cold junction of a thermocouple is kept at $0{}^{\circ }\text{C}$ and the hot junction is kept at $T{}^{\circ }\text{C}$, then the relation between neutral temperature ($T_n$) and temperature of inversion ($T_i$) is:

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show:

In radioactive decay process, the negatively charged emitted $\beta$ -particles are:

A small coin is resting on the bottom of a beaker filled with a liquid. A ray of light from the coin travels up to the surface of the liquid and moves along its surface. How fast is the light traveling in the liquid?

What is the value of inductance $L$ for which the current is a maximum in a series $LCR$ circuit with $C=10\mu \text{F}$ and $\omega =1000{\text{s}}^{-1}$?

Three-point charges $+q$, $-2q$ and $+q$ are placed at points $(0,a,0)$, $(0,0,0)$ and $(a,0,0)$, respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:

A nucleus has mass represented by $M(A,Z)$. If $M_p$ and $M_n$ denote the mass of proton and neutron respectively and $BE$ the binding energy, then:

The position $x$ of a particle with respect to time $t$ along the $x$ -axis is given by $x=9t^2-t^3$ where $x$ is in metre and $t$ in second. What will be the position of this particle when it achieves maximum speed along the $+x$ direction?

The total power dissipated in watts in the circuit shown here is:

In the following circuit, the output $Y$ for all possible inputs $A$ and $B$ is expressed by the truth table:ShutterstockExplore

Assuming the sun to have a spherical outer surface of radius $r$, radiating like a black body at temperature $t{}^{\circ }\text{C}$, the power received by a unit surface, (normal to the incident rays) at a distance $R$ from the centre of the sun is:

A particle starting from the origin $(0,0)$ moves in a straight line in the $(x,y)$ plane. Its coordinates at a later time are $(\sqrt{3},3)$. The path of the particle makes with the $x$ -axis an angle of:

If the ${}_{13}^{27}\text{Al}$ nucleus has a nuclear radius of about $3.6\text{fermi}$, then ${}_{52}^{125}\text{Te}$ would have its radius approximately as:

A wheel has an angular acceleration of $3.0{\text{rad/s}}^2$ and an initial angular speed of $2.00\text{rad/s}$. In a time of $2\text{s}$, it has rotated through an angle (in radian) of:

The resistance of an ammeter is $13\Omega$ and its scale is graduated for a current up to $100\text{A}$. After an additional shunt has been connected to this ammeter it becomes possible to measure currents up to $750\text{A}$ by this meter. The value of shunt resistance is:

Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius $R$ with constant speed $v$. The time period of the motion:

The primary and secondary coils of a transformer have $50$ and $1500$ turns respectively. If the magnetic flux $\varphi$ linked with the primary coil is given by $\varphi ={\varphi }_0+4t$, where $\varphi$ is in weber, $t$ is time in second and ${\varphi }_0$ is a constant, the output voltage across the secondary coil is:

Two condensers, one of capacity $C$ and the other of capacity $C/2$ are connected to a $V$ volt battery, as shown. The work done in charging fully both the condensers is:

A uniform rod $AB$ of length $l$ and mass $m$ is free to rotate about point $A$. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about $A$ is $\frac{m{l}^2}{3}$, the initial angular acceleration of the rod will be:

The frequency of a light wave in a material is $2\times 10^{14}\text{Hz}$ and wavelength is $5000\text{A˚}$. The refractive index of material will be:

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:

A car moves from $X$ to $Y$ with a uniform speed $v_u$ and returns to $X$ with a uniform speed $v_d$. The average speed for this round trip is:

A particle executes simple harmonic oscillation with an amplitude $a$. The period of oscillation is $T$. The minimum time taken by the particle to travel half of the amplitude from the equilibrium position is:

A $5\text{W}$ source emits monochromatic light of wavelength $5000\text{A˚}$. When placed $0.5\text{m}$ away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of $1.0\text{m}$, the number of photoelectrons liberated, will be reduced by a factor of:

A block $B$ is pushed momentarily along a horizontal surface with an initial velocity $v$. If $\mu$ is the coefficient of sliding friction between $B$ and the surface, block $B$ will come to rest after a time:

Two radioactive substances $A$ and $B$ have decay constants $5\lambda$ and $\lambda$ respectively. At $t=0$ they have the same number of nuclei. The ratio of the number of nuclei of $A$ to those of $B$ will be $1/e^2$ after a time interval: