Opening of floral buds into flowers, is a type of

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

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

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

In the leaves of C₄ plants, malic acid formation during CO₂ fixation occurs in the cells of

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

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

The wavelength of light absorbed by P_r form of phytochrome is

What is common between parrot, platypus and kangaroo?

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

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

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

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

Which one of the following items gives its correct total number?

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 change?

Bowman's glands are located in the

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 action?

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

Which one of the following is a slime mould?

ICBN stands for

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

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

Which one of the following statements about mycoplasma is wrong?

Which pair of the following belongs to basidiomycetes?

In gymnosperms, the pollen chamber represents

Spore dissemination in some liverworts is added by

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

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

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

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

Which of the following pairs are correctly matched?

	Animals		Morphological features
(i)	Crocodile	-	4-chambered heart
(ii)	Sea urchin	-	Parapodia
(iii)	Obelia	-	Metagenesis
(iv)	Lemur	-	Thecodont

What is true about Nereis, scorpion, cockroach and silver fish?

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

Geometric representation of age structure is a characteristic of :-

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 ?

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:-

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

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

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

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

One of endangered species of Indian medicinal plants is that of:-

Probiotics are-

Passage cells are thin-walled cells found in:-

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

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

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

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

Biological organization starts with:-

Select the wrong statement from the following:

Which one of the following statements is correct?

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

Male gametes in angiosperms are formed by the division of

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

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

In the human female, menstruation can be deferred by the administration 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 ?

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 F₁ generation ?

Inheritance of skin colour in humans is an example of:-

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

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

The concept of chemical evolution is based on-

Adaptive radiation refers to:-

The finches of Galapogas islands provide an evidence in favour of-

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

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

Increased asthmatic attacks in certain seasons are related to:

Which one of the following pairs is wrongly matched ?

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

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

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

Identify the incorrect statement among the following:

Which of the following will give a pair of enantiomorphs?
(en = NH₂CH₂CH₂NH₂)

The d electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Ni²⁺ are 3d⁴, 3d⁵, 3d⁶ and 3d⁸ respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

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

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called

The product formed in Aldol condensation is

Consider the following compounds

The correct decreasing order of their reactivity towards hydrolysis is

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

Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid?

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

Which of the following vitamins is water-soluble?

RNA and DNA are chiral molecules, their chirality is due to

In the reaction :

Which of the following compounds will be formed?

Concentrated aqueous sulphuric acid is 98% H₂SO₄ by mass and has a density of 1.80 g mL^$$-$$1. Volume of acid required to make one litre of 0.1 M H₂SO₄ solution is

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

The equilibrium constant of the reaction:
Cu_(s) + 2Ag⁺_(aq) $$ \to $$ Cu²⁺_(aq) + 2Ag_(s);
E^o = 0.46 V at 298 K is

The efficiency of a fuel cell is given by

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately
(log 4 = 0.60, log 5 = 0.69)

In a first-order reaction A $$ \to $$ B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is

The reaction of hydrogen and iodine monochloride is given as :
H_2(g) + 2ICl_(g) $$ \to $$ 2HCl_(g) + I_2(g)
This reaction is of first order with respect to H_2(g) and ICl_(g),
following mechanisms were proposed.

Mechanism A :
     H_2(g) + 2ICl_(g) $$ \to $$ 2HCl_(g) + I_2(g)
Mechanism B :
     H_2(g) + ICl_(g) $$ \to $$ HCl_(g) + HI_(g) ; slow
     HI_(g) + ICl_(g) $$ \to $$ HCl_(g) + I_2(g) ; fast

Which of the above mechanism(s) can be consistent with the given information about the reaction?

Consider the following reactions :
(i) H⁺_(aq) + OH^$$-$$_(aq) = H₂O_(l),  $$\Delta $$H = $$-$$ X₁ kJ mol^$$-$$1
(ii) H_2(g) + 1/2O_2(g) = H₂O_(l),   $$\Delta $$H = $$-$$ X₂ kJ mol^$$-$$1
(iii) CO_2(g) + H_2(g) = CO_(g) + H₂O_(l),  $$\Delta $$H = $$-$$ X₃ kJ mol^$$-$$1
(iv) C₂H_2(g) + 5/2O_2(g) = 2CO_2(g) + H₂O_(l),    $$\Delta $$H = +X₄ kJ mol^$$-$$1

Enthalpy of formation of H₂O_(l) is

An element, X has the following isotopic composition:
²⁰⁰X : 90%  ¹⁹⁹X : 8.0%  ²⁰²X : 2.0%

The weighted average atomic mass of the naturally occuring element X is closest to

Consider the following sets of quantum numbers :

	n		l		m		s
(i)	3		0		0		+1/2
(ii)	2		2		1		+1/2
(iii)	4		3		-2		-1/2
(iv)	1		0		-1		-1/2
(v)	3		2		3		+1/2

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

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

Identify the correct order of the size of the following :

With which of the following electronic configuration an atom has the lowest ionisation enthalpy ?

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

The correct order of C $$-$$ O bond length among CO, CO$${_3^{2 - }}$$, CO₂ is

Given that bond energies of H $$-$$ H and Cl $$-$$ Cl are 430 kJ mol^$$-$$1 and 240 kJ mol^$$-$$1 respectively and $$\Delta $$H_f for HCl is $$-$$ 90 kJ mol^$$-$$1, bond enthalpy of HCl is

The equilibrium constants of the following are

N₂ + 3H₂ $$\rightleftharpoons$$ 2NH₃;     K₁

N₂ + O₂ $$\rightleftharpoons$$ 2NO;     K₂

H₂ + $${1 \over 2}$$O₂ $$\rightleftharpoons$$ H₂O;     K₃

The equilibrium constant (K) of the reaction :

2NH₃ + $${5 \over 2}$$ O₂ $$\rightleftharpoons$$ 2NO + 3H₂O will be

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

Calculate the pOH of a solution at 25^oC that contains 1 $$ \times $$ 10^$$-$$10 M of hydronium ions, i.e. H₃O⁺.

CH₃ $$-$$ CHCl $$-$$ CH₂ $$-$$ CH₃ has a chiral centre. Which one of the following represents its R-configuration?

The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol

For (i) I^$$-$$, (ii) Cl^$$-$$, (iii) Br^$$-$$, the increasing order of nucleophilicity would be

Predict the product C obtained in the following reaction of 1-butyne.

Which of the compound with molecular formula C₅H₁₀ yields acetone on ozonolysis?

If there is no rotation of plane polarised light by a compound in a specific solvent, through to be chiral, it may mean than

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

The total power dissipated in watt in the circuit shown here is

Three resistances, P, Q, R each of 2$$\Omega $$ and an unknown resistance S from the four arms of a Wheatstone bridge circuit. When a resistance of 6 $$\Omega $$ is connected in parallel to S the bridge gets balanced. What is the value of S?

Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle

The resistance of an ammeter is 13 $$\Omega $$ and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is

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

A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment $$\mu $$ is given by

A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately

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

The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux $$\phi $$ linked with the primary coil is given by $$\phi $$ = $$\phi $$₀ + 4t, where $$\phi $$ is webers, t is time in seconds and $$\phi $$₀ is a constant, the output voltage across the secondary coil is

The electric and magnetic field of an electromagnetic wave are

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

The frequency of a light wave in a material is 2 $$ \times $$ 10¹⁴ Hz and wavelength is 5000 $$\mathop A\limits^ \circ $$. The refractive index of material will be

Monochromatic light of frequency 6.0 $$ \times $$ 10¹⁴ Hz is produced by a laser. The power emitted is 2 $$ \times $$ 10^$$-$$3 W. The number of photons emitted, on the average, by the source per second is

A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move

A 5 watt source emits monochromatic light of wavelength 5000 $$\mathop A\limits^ \circ $$. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of

In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential $$V$$ and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio $$\left( {{{ch\arg e\,\,on\,\,\,the\,\,ion\,\,} \over {mass\,\,of\,\,the\,\,ion}}} \right)$$ will be proportional to

A nucleus $${}_Z^AX$$ has mass represented by M(A, Z). If M_p and M_n denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then

The total energy of electron in the ground state of hydrogen atom is $$-$$ 13.6 eV. The kinetic energy of an electron in the first excited state is

Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁ is four times the mass of S₂. Which one of the following statements is true ?

A particle moving along x-axis has acceleration f, at time t, given by f = f₀$$\left( {1 - {t \over T}} \right),$$ where f₀ and T are constants.The particle at t = 0 has zero velocity. In the time interval between t = 0 and the instant when f = 0, the particle's velocity (v_x) is

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

The positions x of a particle with respect to time t along x-axis is given by x = 9t² $$-$$ t³ where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction ?

$$\overrightarrow A $$ and $$\overrightarrow B $$ are two vectors and $$\theta $$ is the angle between them, if $$\left| {\overrightarrow A \times \overrightarrow B } \right| = \sqrt 3 \left( {\overrightarrow A .\overrightarrow B } \right),$$ the value of $$\theta $$ is

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

A block B is pushed momentarily along a horizontaly 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

A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is

A particle of mass m moves in the XY plane with a velocity v along the straight line AB. If the angular momentum of the particle with respect to origin O is L_A when it is at A and L_B when it is at B, then

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 ml²/3, the initial angular acceleration of the rod will be

A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed of 2.00 rad/sec. In a time of 2 sec it has rotated through an angle (in radian) of

Which one of the following represents forward bias diode ?

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t^oC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
where $$\sigma $$ is the Stefan's constant.

A black body is at 727^oC. It emits energy at a rate which is proportional to

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62^oC, its efficiency is doubled. Temperatures of the source 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 mass of 2.0 kg is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass of the spring and the pan is negligible.

When pressed slightly and released the mass executes a simple harmonic motion. The spring constant is 200 N/m. What should be the minimum amplitude of the motion so that the mass gets detached from the pan (take g = 10 m/s²).

The particle executing simple harmonic motion has a kinetic energy K₀cos²$$\omega $$t. The maximum values of the potential energy and the total energy are respectively

The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is

Charges +q and $$-$$q are placed at points A and B respectively which are a distance 2L apart, C is the midnight between A and B. The work done in moving a charge + Q along the semicircle CRD is

A hollow cylinder has a charge q coulomb within it. If $$f$$ is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of V-m will be

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

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

For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct ?

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

Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be