Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when

Chromatophores take part in

In photosynthesis, the light-independent reactions take place at

Auxin can be bioassayed by

Name the pulmonary disease in which alveolar surface area involved in gas exchage is drastically reduced due to damage in the alveolar walls.

Which one of the following animals has two separate circulatory pathways?

Human urine is usually acidic because

Which of the following is not a function of the skeletal system?

Which of the following joints would allow no movements?

Destruction of the anterior horn cells of the spinal cord would result in loss of

In mammalian eye, the 'fovea' is the center of the visual field, where

Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?

Which one of the following hormones is not involved in sugar metabolism?

Filiform apparatus is characteristic feature of

In angiosperms, microsporogenesis and mega-sporogenesis

Cell wall is absent in

Select the wrong statement.

Which one is a wrong statement?

In which group of organisms the cell walls form two thin overlapping shells which fit together?

Pick up the wrong statement.

The structures that help some bacteria to attach to rocks and/or host tissues are

Choose the wrong statement.

Flowers are unisexual in

Body having meshwork of cells, internal cavities lined with food filtering flagellated cells and indirect development are the characteristics of Phylum

Metagenesis refers to

A jawless fish, which lays eggs in fresh water and whose ammocoetes larvae after metamorphosis return to the ocean is

The wheat grain has an embryo with one large, shield shaped cotyledon known as

Among China rose, mustard, brinjal, potato, guava, cucumber, onion and tulip, how many plants have superior ovary?

Axile placentation is present in

Roots play insignificant role in absorption of water in

Which of the following biomolecules does have a phosphodiester bond?

The chitinous exoskeleton of arthropods is formed by the polymerisation of

Arrange the following events of meiosis in correct sequence
(i)  Crossing over
(ii)  Synapsis
(iii)  Terminalisation of chiasmata
(iv)  Disappearance of nucleolus

Golden rice is a genetically modified crop plant where the incorporated gene is meant for biosynthesis of -

The introduction of t-DNA into plants involves -

In which of the following interactions both partners are adversely affected?

An association of individuals of different species living in the same habitat and having functional interactions is -

Most animals that live in deep oceanic waters are -

During ecological succession :

In which of the following both pairs have correct combination?

The species confined to a particular region and not found elsewhere is termed as -

The cutting of DNA at specific locations became possible with the discovery of -

Read the different components from (1) to (4) in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem :
(1) Secondary cortex
(2) Wood
(3) Secondary phoem
(4) Phellem
The correct order is :

The body cell in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of -

The function of the gap junction is to -

Match the columns and identify the correct option.

Column I	Column II
(a) Thylakoids	(i) Disc-shaped sacs in Golgi apparatus
(b) Cristae	(ii) Condensed structure of DNA
(c) Cisternae	(iii) Flat membranous sacs in stroma
(d) Chromatin	(iv) Infoldings in mitochondria

Which of the following structures is not found in a prokaryotic cell?

Cellular organelles with membranes are -

Which of the following are not membranebound ?

The imperfect fungi which are decomposers of litter and help in mineral cycling belong to

Identify the correct order of organisation of genetic material from largest to smallest :

Which one of the following fruits is parthenocarpic?

Coconut water from a tender coconut is

Male gametophyte in angiosperms produces

In human females, meiosis-II is not completed until

Ectopic pregnancies are referred to as

Which of the following events is not associated with ovulation in human life?

Which of the following layers in an antral follicle is acellular?

A childless couple can be assisted to have a child through a technique called GIFT. The full form of this technique is :

Which one of the following is not applicable to RNA?

Balbiani rings are sites of :

Satellite DNA is important because it :

Which of the following diseases is caused by a protozoan?

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

Which of the following immunoglobulins does constitute the largest percentage in human milk?

Grafted kidney may be rejected in a patient due to -

Match the following list of microbes and their importance -

Column I	Column II
(a) Sacharomyces cerevisiae	(i) Production of immunosuppressive agent
(b) Monascus purpureus	(ii) Ripening of Swiss cheese
(c) Trichoderma polysporum	(iii) Commercial production of ethanol
(d) Propionibacterium sharmanii	(iv) Production of blood cholesterol lowering agents

The DNA molecule to which the gene of interest is integrated for cloning is called -

The sum of coordination number and oxidation number of the metal M in the complex [M(en)₂(C₂O₄)]Cl (where en is ethylenediamine) is

The hybridization involved in complex [Ni(CN)₄]^$$2-$$ is (At. No. Ni = 28)

The name of complex ion, [Fe(CN)₆]^3$$-$$ is

Number of possible isomers for the complex [Co(en)₂Cl₂]Cl will be (en = ethylenediamine)

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

Which of the following reaction(s) can be used for the preparation of alkyl halides?

The oxidation of benzene by V₂O₅ in the presence of air produces

Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

Which one of the following esters gets hydrolysed most easily under alkaline conditions?

The following reaction

is known by the name

Method by which aniline cannot be prepared is

The number of structural isomers possible from the molecular formula C₃H₉N is

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

What is the mole fraction of the solute in a 1.00 m aqueous solution?

The rate constant of the reaction A $$ \to $$ B is 0.6 $$ \times $$ 10^$$-$$3 mol L^$$-$$1 s^$$-$$1. If the concentration of A is 5 M, then concentration of B after 20 minutes is

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl.

What explains the higher boiling point of hydrogen fluoride?

Strong reducing behavior of H₃PO₂ is due to

The formation of the oxide ion, O^2$$-$$_(g) from oxygen atom requires first an exthermic and then an endothermic step as shown below:
O_(g) + e^$$-$$ $$ \to $$ O^$$-$$_(g);  $$\Delta $$_fH^o = $$-$$141 kJ mol^$$-$$1

O^$$-$$_(g) + e^$$-$$ $$ \to $$ O^2$$-$$_(g);  $$\Delta $$_fH^o = +780 kJ mol^$$-$$1

Thus, process of formation of O^2$$-$$ is isoelectronic with neon. It is due to the fact that,

Which of the statements given below is incorrect?

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO₄ for complete oxidation?

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO₃ is mixed with 50 mL of 5.8% NaCl solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5

If Avogadro number N_A, is changed from 6.022 $$ \times $$ 10²³ mol^$$-$$1 to 6.022 $$ \times $$ 10²⁰ mol^$$-$$1, this would change

The number of water molecules is maximum in

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)

In which of the following pairs, both the species are not isostructural ?

Decreasing order of stability of O₂, O₂^$$-$$, O₂⁺ and O₂^2$$-$$ is

The heat of combination of carbon to CO₂ is $$-$$393.5 kJ/mol. The heat released upon formation of 35.2 g of CO₂ from carbon and oxygen gas is

If the equilibrium constant for

N_2(g) + O_2(g) $$\rightleftharpoons$$ 2NO_(g) is K, the equilibrium

constant for

$${1 \over 2}$$ N_2(g) + $${1 \over 2}$$O_2(g) $$\rightleftharpoons$$ NO_(g) will be

Aqueous solution of which of the following compounds is the best conductor of electric current ?

Which one of the following pairs of solution is not an acidic buffer ?

Which of the following statements is not correct for a nucleophile?

Which of the following is not the product of dehydration of

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule to give a product 1-chloro-1 methylcyclohexane. The possible alkene is

The possible stereo-structures of CH₃CHOHCOOH, which are optically active, are called

In an S_N1 reaction on chiral centers, there is

A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 weber/m². The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30^o with the direction of the field, the torque required to keep the coil in stable equilibrium will be

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0 J K^$$-$$1 mol^$$-$$1. If the speed of sound in this gas at NTP is 952 m s^$$-$$1, then the heat capacity at constant pressure is
(Take gas constant R $$=$$ 8.3 J K^$$-$$1 mol^$$-$$1)

A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A parallel plate air capacitor has capacity C, distance of separation between plates is d and potential difference $$V$$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is

If potential (in volts) in a region is expressed as V(x, y, z) = 6xy $$-$$ y + 2yz, the electric field (in N/C) at point (1, 1, 0) is

Two metal wires of identical dimensions are connected in series. If $$\sigma $$₁ and $$\sigma $$₂ are the conductivity of the combination is

A circuit contains an ammeter, a battery of 30 V and a resistance 40.8 ohm all connected in series. If the ammeter has a coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E₀ and a resistance r₁. An unknown e.m.f. E is balanced at a length $$l$$ of the potentiometer wire. The e.m.f. E will be given by

A proton and an alpha particle both enter a region of uniform magnetic field B, moving at right angles to the field B. If the radius of circular orbits for both the particles is equal and the kinetic energy acquired by proton is 1 MeV, the energy acquired by the alpha particle will be

A particle is executing a simple harmonic motion. Its maximum acceleration is $$\alpha $$ and maximum velocity is $$\beta $$. Them, its time period of vibration will be

A series R-C circuit is connected to an alternating voltage source. Consider two situations :
(a)  When capacitor is air filled.
(b)  When capacitor is mica filled.
Current through resistor is $$I$$ and voltage across capacitor is $$V$$ then

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ?

The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?

At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is

A beam of light consisting of red, green and blue colours is incifent on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively.


The prism will

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is $$I$$. The magnification of the telescope is

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, $${{{I_{max}}} \over {{I_{min}}}}$$ is

A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda $$ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, C = speed of light)

Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

A force $$\overrightarrow F = \alpha \widehat i + 3\widehat j + 6\widehat k$$ is acting at a point $$\overrightarrow r = 2\widehat i - 6\widehat j - 12\widehat k$$. The value of $$\alpha $$ for which angular momentum about origin is conserved is

If vectors $$\overrightarrow A = \cos \omega t\widehat i + \sin \omega t\widehat j$$ and $$\overrightarrow B = \cos {{\omega t} \over 2}\widehat i + \sin {{\omega t} \over 2}\widehat j$$ are functions of time, then the value of t at which they are orthogonal to each other is

The positions vector of a particle $$\overrightarrow R $$ as a function of time is given by $$\overrightarrow R $$ = 4sin(2$$\pi $$t)$$\widehat i$$ + 4cos(2$$\pi $$t)$$\widehat j$$. Where R is in meters, t is in seconds and $$\widehat i$$ and $$\widehat j$$ denote unit vectors along x-and y-directions, respectively. Which one of the following statements is wrong for the motion of particle?

Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius $${r \over 2}$$ and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they exprience same centripetal forces. The value of n is

A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30^o, the box starts to slip and slides 4.0 m down the plank in 4.0 s.



The coefficients of static and kinetic friction between the box and the plank will be, respectively

Two particles A and B, move with constant velocities $$\overrightarrow {{v_1}} $$ and $$\overrightarrow {{v_2}} $$. At the initial moment their position vectors are $$\overrightarrow {{r_1}} $$ and $$\overrightarrow {{r_2}} $$ respectively. The condition for particles A and B for their collision is

The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury. If the density of mercury be 13.6 $$ \times $$ 10³ kg/m³ and g = 10 m/s² then the power (in watt) is

A ball is thrown vertically downwards from a height of 20 m with an initial velocity v₀. It collides with the ground, losses 50 percent of its energy in collision and rebounds to the same height. The initial velocity v₀ is
(Take g = 10 m s^$$-$$2)

On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle $$\theta $$ to its initial direction and has a speed $${v \over 3}.$$ The second block's speed after the collision is

Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L, and negligible mass. The rod is to be set rotating about an axis perpendicular to it. The position of point P on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity $$\omega $$₀ is minimum, is given by

An automobile moves on a road with a speed of 54 km h^$$-$$1. The radius of its wheels is 0.45 m and the moment of inertia of the wheel about its axis of rotation is 3 kg m². If the vehicle is brought to rest in 15 s, the magnitude of average torque transmitted by its brakes to the wheel is

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is

A remote-sensing satellite of earth revolves in a circular orbit at a height of 0.25 $$ \times $$ 10⁶ m above the surface of earth. If earth's radius is 6.38 $$ \times $$ 10⁶ m and g = 9.8 ms^$$-$$2, then the orbital speed of the satellite is

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,

Water rises to a height h in capillary tube. If the length of capillary tube above the surface of water is made less than h, then

The value of coefficient of volume expansion of glycerin is 5 $$ \times $$ 10^$$-$$4 K^$$-$$1. The fractional change in the density of glycerin for a rise of 40^oC in its temperature, is

The cylindrical tube of a spray pump has radius R, one end of which has n fine holes, each of radius r. If the speed of the liquid in the tube is V, the speed of the ejection of the liquid through the holes is

The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas ?

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is $$-$$20^oC, the temperature of the surroundings to which it rejects heat is

Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

In the given figure, a diode D is connected to an external resistance R = 100 $$\Omega $$ and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the citcuit will be

If dimensions of critical velocity $$\upsilon $$_c of a liquid flowing through a tube are expressed as $$\left[ {{\eta ^x}{\rho ^y}{r^z}} \right]$$ where $$\eta ,\rho $$ and r are the coefficient of viscosity of liquid, density of liquid and radius of the tube respectively, then the values of x, y and z are given by