A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO₂ to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C₁₂H₁₀N₂O. The structure of compound A is :

Consider the reaction :

CH₃CH₂CH₂Br + NaCN  → CH₃CH₂CH₂CN + NaBr

This reaction will be the fastest in :

The correct structure of the product A formed in the reaction:

Which among the give nmolecules can exhibit tautomerism?

The correct order of strengths of the carboxylic acids :

The compound that will react most readily with gaseous bromine has the formula :

Which one of the following compounds shows the presence of intramolecular hydrogen bond ?

The molar conductivity of a 0.5 mol/ dm3 solution of AgNO3 with electrolytic conductivity of 5.76 × 10^–3 S cm^–1 at 298 K is

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

How many electrons can fit in the orbital for which n = 3 and £ = 1 ?

For a sample of perfect gas when its pressure is changed isothermally from pi to pf , the entropy change is given by

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N +H) in a 0.10 M aqueous pyridine solution (Kb for C₅H₅N = 1.7 × 10^–9) is

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F– ) are

Which one of the following is incorrect for ideal solution ?

The solubility of AgCl(s) with solubility product 1.6 × 10 ^–10 is in 0.1 M NaCl solution would be

Suppose the elements X and Y combine to form two compounds XY₂ and X₃Y₂. When 0.1 mole of XY₂ and XY₂ weights 10 g and 0.05 mole of X₃Y₂ weights 9 g, the atomic weights of X and Y are

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 × 10^–19 C)

Boric acid is an acid because its molecule

(1) Combines with proton from water molecule

(2) Contains replaceable H⁺ ion

(3) Gives up a proton

(4) Accepts Om water releasing proton

AIF₃ is soluble in HF only in presence of KF. It is due to the formation of

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

The suspension of slaked lime in water is known as

Which of the following fluoro-compounds is most likely to behave as a Lewis base ?

Which of the following pairs of ions is isoelectronic and isostructural ?

In context with beryllium, which one of the following statements is incorrect ?

Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour ?

Which of the following pairs of d-orbitals will have electron density along the axis ?

The correct geometry and hybridization for XeF4 are

Among the following, which one is a wrong statement?

The correct increasing order of trans-effect of the following species is

Which one of the following statements related to lanthanons is incorrect ?

Jahn-Teller effect is not observed in high spin complexes of

Which of the following can be used as the halide component for Freidel –Crafts reaction?

In which of the following molecules, all atoms are coplanar ?

Which one of the following structures represent nylon 6,6 polymer ?

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?

Which one of the following nitro-compounds does not react with nitrous acid

the central dogma of molecular genetics states that the genetic information flows from

A foreign DNA and plasmid cut by the same restriction endonuclease can be joined to form a recombinant plasmid using

Which of the following is not a component of downstream processing?

Which of the following restriction enzymes produces blunt ends?

Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase (ADA) deficiency?

How many hot spots of biodiversity in the world have been identified till date by Norman Myers?

The primary producers of the deep-sea hydrothermal vent ecosystem are

Which of the following is correct for r-selected species?

If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to

Which of the following is correctly matched?

Red List contains data or information on

Which one of the following is wrong for fungi?

Methanogens belong to

Select the wrong statement.

The label of a herbarium sheet does not carry information on

Conifers are adapted to tolerate extreme environmental conditions because of

Which one of the following statements is wrong?

The term 'polyadelphous' is related to

How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?

Radial symmetry is found in the flowers of

Free-central placentation is found in

Cortex is the region found between

The balloon-shaped structures called tyloses

A non-proteinaceous enzyme is

Select the mismatch.

Select the wrong statement.

A cell organelle containing hydrolytic enzymes is

During cell growth, DNA synthesis takes place in

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

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

Phytochrome is a

Which is essential for the growth of root tip?

The process which makes major difference between C3 and C4 plants is

Which one of the following statements is not correct

Which one of the following in&generates new genetic combinations leading to variation?

Match Column-I with Column-II and select the correct option using the codes given below : Column-I Column-II a. Pistils fused together (i) Gametogenesis b. Formation of gametes (ii) Pistillate c. Hyphae of higher Ascomycetes (iii) Syncarpous d. Unisexual female flower (iv) Dikaryotic

In majority of angiosperms

Pollination in water hyacinth and water lily is brought about by the agency of

The ovule of an angiosperm is technically equivalent to

Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

The mechanism that causes a gene to move from one linkage group to another is called

The equivalent of a structural gene is A true breeding plant is

A true breeding plant is

Which of the following rRNAs acts as structural RNA as well as ribozyme in bacterial

Stirred-tank bioreactors have been designed for

A molecule that can act as a genetic material must fulfill the traits given, except

DNA- dependent RNA polymerase catalyzes transcription on the strand of the DNA which is called the

Interespecific hybridization in the mating of

Which of the following is correct regarding AIDS causative HIV?

Among the following edible fishes, which one is a marine fish having rich source of omega-3 fatty acids?

Match Column-I with Column-II and select the correct option using the codes given below:

Column-I Column-II

a. Citric acid (i) Trichoderma

b. Cyclosporin A (ii) Clostridium

c. Statins (iii) Aspergillus

d. Butyric (iv) Monascus

Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from

The principle of competitive exclusion was stated by

Which of the following National Parks is home to the famous musk deer or hangul?

A lake which is rich in organic waste may result in

The highest DDT concentration in aquatic food chain shall occur in

Which of the following sets of diseases is caused by bacteria?

Match Column-I with Column-II for housefly classification and select the correct option using the codes given below :

Column-I Column-II

a. Family (i) Diptera

b. Order (ii) Arthropoda

c. Clsass (iii) Muscidae

d. Phylum (iv) Insecta

Choose the correct statement.

Study the four statements (A - D) given below and select the two correct ones out of them :

A. Definition of biological species was given by Ernst Mayr.

B. Photoperiod does not affect reproduction in plants.

C. Binomial nomenclature system was given by R. H. Whittaker.

D. In unicellular organisms, reproduction is synonymous with growth.

The two correct statements are

In male cockroaches, sperms are stored in which part of the reproductive system?

Smooth muscles are

Oxidative phosphorylation is

Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?

Which of the following describes the given graph correctly?

When cell has stalled DNA replication fork, which checkpoint should be predominantly activated?

Match the stages of meiosis in Column-I to their characteristic features in Column-II and select the correct option using the codes given below :

Column-I Column-II

a. Pachytene (i) Pairing of homologous chromosomes

b. Metaphase I (ii) Terminalization of chiasmata -

c. Diakinesis (iii) Grossing-over takes place

d. Zygotenev (iV) Chromosomes align at equatorial plate

Which hormones do stimulate the production of pancreatic juice and bicarbonate?

The partial pressure of oxygen in the alveoli of the lungs is

Choose the correct statement.

Graves' disease is caused due to

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.

Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilization.

Osteoporosis, an age related disease of skeletal system , may occur due to

Serum differs from blood in

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because

The posterior pituitary gland is not a 'true' endocrine gland because

The part of nephron involved in active reabsorption of sodium is

Which of the following is hormonereleasing IUD?

Which of the following is incorrect .regarding vasectomy?

Embryo with more than 16 blastomeres formed due to in vitro fertilization is transferred into

Which of the following depicts the correct pathway of transport of sperms?

Match Column-I with Column-II and select the correct option using the codes given below :

Column-I Column-II

a. Mons pubis (i) Embryo formation

b. Antrum (ii) Sperm

c. Trophectoderm (iii) Female external genitalia

d. Nebenkern (iv) Graafian follicle

Several hormones like hCG, hPL, estrogen. progesterone are produced by

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

Genetic drift operates in

In Hardy-Weinberg equation, the frequency of heterozygous individual is represented by

The chronological order of human evolution from early to the recent is 

Which of the following is the correct sequence of events in the origin of life?

I. Formation of protobionts

II. Synthesis of organic monomers

III. Synthesis of organic polymers

IV. Formation of DNA-based genetic systems

A person can see clearly object only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be :

A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5 × 10^–5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is :

Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube. The cutoff wavelength (λ0) of the emitted X-ray is :

Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is :

If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength λ. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be :

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is :

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is 1 kΩ, then the input signal voltage is :

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R1 will be :

What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1 ?

Planck's constant (h), speed of light in vacuum (c) and Newton's gravitational constant (G) are three fundamental constants. Which of the following combinations of these has dimension of length? 

Two cars P and Q start from a point at the same time in a straight line and their positions are represented by xp(t) = at + bt² and xQ (t) = ft – t² . At what time do the cars have the same velocity

In the given figure, a = 15 m/s² represents the total acceleration of a particle moving in the clockwise direction in a circle of radius R = 2.5 m at a given instant of time. The speed of the particle is

A rigid ball of mass m strikes a rigid wall at 60º and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall in the ball will be

A bullet of mass 10 g moving horizontally with a velocity of 400 ms^–1 strikes of wooden block of mass 2 kg which is suspended by a light inextensible string of length 5 m. As a result the centre of gravity of the block is found to rise a vertical distance of 10 cm. The speed of the bullet after it emerges out horizontally from the block will be

Two identical balls A and B having velocities of 0.5 m/s and –0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be

Two rotating bodies A and B of masses m and 2m with moments of inertia I_A and I_B (I_B > I_A) have equal kinetic energy of rotation. If L_A and L_B be their angular momenta respectively, then

A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation (E_sphere / E cylinder) will be :

A light rod of length l has two masses m₁ and mattached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is :

Starting from the centre of the earth having radius r, the variation of g (acceleration due to gravity) is shown by

A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0, the value of acceleration due to gravity at the earth's surface, is

A rectangular film of liquid is extended from (4 cm × 2cm) to (5 cm × 4 cm). If the work done is 3 × 10^–4 J, the value of the surface tension of the liquid is

Three liquids of densities 1, 2 and 3 (with 1 > 2 > 3), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact θ1, θ2 and θ3 obey

Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100ºC, while the other one is at 0ºC. If the two bodies are brought into contact, then assuming no heat loss, the final common temperature is

A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newton's law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be

One mole of an ideal monatomic gas undergoes a process described by the equation PV3 = constant. The heat capacity of the gas during this process is :

The temperature inside a refrigerator is t₂ ºC and the room temperature is t₁ ºC. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas ?

A body of mass m is attached to the lower end of a spring whose upper end is fixed. The spring has negligible mass. When the mass m is slightly pulled down and released, it oscillates with a time period of 3 s. When the mass m is increased by 1 kg, the time period of oscillations becomes 5 s. The value of m in kg is :

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L meter long. The length of the open pipe will be

Three sound waves of equal amplitudes have frequencies (n –1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be

An electric dipole is placed at an angle of 30º with an electric field intensity 2 ×10⁵ N/C. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2cm, is

A parallel- plate capacitor of area A, plate separation d and capacitance C is filled with four dielectric materials having dielectric constant k₁, k₂, k₃ and k₄ as shown in the figure below. If a single dielectric material is to be used to have the same capacitance C in this capacitor, then its dielectric constant k is given by

The potential difference (V_A – V_B) between the points A and B in the given figure is :

A filament bulb (500 W, 100 V) is to be used in a 230 V main suply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500 W. The value of R is : 

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be :

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60º is W. Now the torque required to keep the magnet in this new position is :

An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57 × 10^–2 T. If the value of e/m is 1.76 × 10¹¹ C/kg, the frequency of revolution of the electron is :

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication? 

A uniform magnetic field is restricted within a region of radius r. The magnetic field changes with time at a rate dB / dt . Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure below. Then the e.m.f. generated is :

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

A 100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

Two identical glass (μ_g = 3/2) equiconvex lenses of focal length f each are kept in contact. The space between that two lenses in filled with water (μ_w = 4/3). The focal length of the combination is

An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio I_max-I_min/I_max+I_min will be