Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation.

Which statement is wrong for Krebs' cycle?

Fruit and leaf drop at early stages can be prevented by the application of

Lungs are made up of air-filed sacs, the alveoli. The do not collapse even after forceful expiration, because of

Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(1)  They do not need to reproduce.
(2)  They are somatic cells.
(3)  They do not metabolise.
(4)  All their internal space is available for oxygen transport.

The hepatic portal vein drains blood to liver from

A decrease in blood pressure/volume will not cause the release of

Which of the following statements is correct?

The pivot joint between atlas and axis is a type of

Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in

Receptor sites for neurotransmitters are present on

Myelin sheath is produced by

Good vishion depends on adequate intake of carotene rich food.

Select the best option from the following statements.
(1)  Vitamins A derivatives are formed from carotene,
(2)  The photopigments are embedded in the membrane discs of the inner segment.
(3)  Retinal is a derivative of vitamin A.
(4)  Retinal is a light absorbing part of all the visual photopigments.

GnRH, a hypothalamic hormone, needed in reproduction, acts on

Hypersecretion of growth hormone in adults does not cause further increase in height, because

A temporary endocrine gland in the human body is

Functional megaspore in an angiosperm develops into an

Flowers which have single ovule in the ovary and are packed into inflorescence are usualy pollinated by

A dioecious flowering plant prevents both

Attractants and rewards are required for

Which of the following represents order of 'Horse'?

Viroids differ from viruses in having

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survise without oxygen?

DNA replication in bacteria occurs

Which of the following components provides sticky character to the bacterial cell?

An example of colonial alga is

Select the mismatch

Zygotic meiosis is characteristic of

Life cycles of Ectocarpus and Fucus respectively are

Which among these is the correct combination of aquatic mammals?

In case of proiferans, the spongocoel is lined with flagellated cells called

Important characteristic that hemichordates share with chordates is

Double fertilisation is exhibited by

The morphological nature of the edible part of coconut is

Coconut fruit is a

In Bougainvillea, throns are the modifications of

Which of the following statements is correct with reference to enzymes?

Which of the following are not polymeric?

Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cell. If APC is defective in a human cell, which of the following is expected to occur?

Which of the following options gives the correct sequence of events during mitosis?

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

Alexander Von Humbolt described for the first time :

What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ?

DNA fragments are

A gene whose expression helps to identify transformed cell is known as

The process of separation and purification of expressed protein before marketing is called :

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in :

Plants which produce characteristic pneumatophores and show vivipary belong to :

Asymptote in a logistic growth curve is obtained when :

Mycorrhizae are the example of :

Which ecosystem has the maximum biomass ?

Which one of the following is related to Ex-situ conservation of threatened animals and plants ?

The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as :

The DNA fragments separated on an agarose gel can be visualised after staining with

The vascular cambium normally gives rise to :

Which of the following is made up of dead cells ?

Identify the wrong statement in context of heartwood :

Root hairs develop from the region of :

Select the correct route for the passage of sperms in male frogs :

Frog’s heart when taken out of the body continues to beat for sometime. Select the best option from the following statements.
(a) Frog is a poikilotherm
(b) Frog does not have any coronary circulation
(c) Heart is “myogenic” in nature
(d) Heart is autoexcitable

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

In case of poriferans, the spongocoel is lined with flagellated cells called

Among the following characters, which one was not considered by Mendel in his experiments on pea?

During DNA replication, Okazaki fragments are used to elongate

Capacitation occurs in

Match the following sexually transmitted diseases (Column – I) with their causative agent (Column – II) and select the correct option

Column – I	Column – II
(a) Gonorrhea	(i) HIV
(b) Syphilis	(ii) Neisseria
(c) Genital Warts	(iii) Treponema
(d) AIDS	(iv) Human papilloma – virus

The function of copper ions in copper releasing IUD's is :

In case of a couple where the male is having a very low sperm count, which technique will be suitable for fertilization ?

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

The genotypes of a Husband and Wife are I^AI^B and I^Ai.
Among the blood types of their children, how many different genotypes and phenotypes are possible?

A disease caused by an autosomal primary non-disjunction is :

Which one from those given below is the period for Mendel’s hybridisation experiments ?

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

The final proof for DNA as the genetic material came from the experiments of

Which of the following are found in extreme saline conditions?

Which of the following RNAs should be most abundant in animal cell ?

Spliceosomes are not found in cells of :

The association of histone H₁ with a nucleosome indicates :

Transplantation of tissues/ organs fails often due to non-acceptance by the patient's body. Which type of immuneresponse is responsible for such rejections ?

MALT constitutes about ________ percent of the lymphoid tissue in human body

Select the mismatch :

Which of the following in sewage treatment removes suspended solids ?

Which of the following is correctly matched for the product produced by them ?

Which one is the wrong statement ?

In which pair of ions both the species contain S $$-$$ S bond?

Which of the following reactions is appropriate for converting acetamide to methanamine?

Which of the following statements is not correct?

If molality of the dilute solution is doubled, the value of molal depression constant (K_f) will be

Which of the following is dependent on temperature?

In the electrochemical cell :
$$Zn\left| {ZnS{O_4}\left( {0.01\,M} \right)} \right|$$$$\left| {CuS{O_4}\left( {1.0M} \right)} \right|Cu,$$
the emf of this Daniell cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E₂. From the followings, which one is the relationship between E₁ and E₂? (Given, RT/F = 0.059)

Mechanism of a hypothetical reaction
X₂ + Y₂ $$ \to $$ 2XY, is given below :
(i)   X₂ $$ \to $$ X + X (fast)
(ii)  X + Y₂ $$\rightleftharpoons$$ XY + Y (slow)
(iii) X + Y $$ \to $$ XY (fast)
The overall order of the reaction will be

A first order reaction has a specific reaction rate of 10^$$-$$2 sec^$$-$$1. How much time will it take for 20 g of the reactant to reduce to 5 g?

It is because of inability of ns² electrons of the valence shell to participate in bonding that

Match the interhalogen compounds of column-I with the geometry in column-II and assign the correct code.

Column $${\rm I}$$			Column $${\rm I}$$$${\rm I}$$
(A)	XX'		(i)	T-shape
(B)	XX'3		(ii)	Pentagonal bipyramidal
(C)	XX'5		(iii)	Linear
(D)	XX'7		(iv)	Square pyramidal
			(v)	Tetrahedral

The correct increasing order of basic strength for the following compounds is

HgCl₂ and I₂ both when dissolved in water containing I^$$-$$ ions, the pair of species formed is

Name the gas that can readily decolourise acidified KMnO₄ solution.

The reason for greater range of oxidation states in actinoids is attributed to

An example of a sigma bonded organometallic compound is

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes : CoCl₃.6NH₃, CoCl₃.5NH₃, CoCl₃.4NH₃ respectively is

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

Pick out the correct statement with respect to [Mn(CN)₆]^3$$-$$.

The correct statement regarding electrophile is

The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ?

The species, having bond angles of 120^o is

Which of the following pairs of compounds is isostructural ?

Which one of the following pairs of species have the same bond order ?

For a given reaction, $$\Delta $$H = 35.5 kJ mol^$$-$$1 and $$\Delta $$S = 83.6 J K^$$-$$1 mol^$$-$$1. The reaction is spontaneous at (Assume that $$\Delta $$H and $$\Delta $$S do not vary with temperature.)

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy $$\Delta $$U of the gas in joules will be

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

Concentration of the Ag⁺ ions in a saturated solution of Ag₂C₂O₄ is 2.2 $$ \times $$ 10^$$-$$4 mol L^$$-$$1. Solubility product of Ag₂C₂O₄ is

A 20 litre container at 400 K contains CO_2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be

(Given that : SrCO_3(s) $$\rightleftharpoons$$ SrO_(s) + CO_2(g), K_p = 1.6 atm)

The IUPAC name of the compound

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

Which one is the correct order of acidity?

Predict the correct intermediate and product in the following reaction :

$${H_3}C - C \equiv CH\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{HgS{O_4}}^{{H_2}O,{H_2}S{O_4}}} \mathop {Intermediate}\limits_{(A)} \to \mathop {\Pr oduct}\limits_{(B)} $$

With respect to the conformers of ethane, which of the following statements is true?

Identify $$A$$ and predict the type of reaction.

The heating of phenyl methyl ether with HI produces

Which one is the most acidic compound?

Consider the reactions,

Identify A, X, Y and Z.

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating?

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8^th bright fringe in the medium lies where 5^th dark fringe lies in air. The refractive index of the medium is nearly

Suppose the charge of a proton and an electron differ slightly. One of them is $$-$$e, the other is (e + $$\Delta $$e). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (musch greater than atomic size) apart is zero, then $$\Delta $$e is of the order of
[Given : mass of hydrogen m_h = 1.67 $$ \times $$ 10$$-$$²⁷ kg]

The diagrams below show regions of equipotentials.


A positive charge is moved from A to B in each diagram.

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length. its new resistance will be

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current $$'I'$$ along the same direction as shown in fogure. Magnitude of force per unit length on the middle wire $$'B'$$ is given by

If $$\theta $$₁ and $$\theta $$₂ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $$\theta $$ is given by

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $$\mu $$A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180^o against the torque is

A long solenoid of diameter 0.1 m has 2 $$ \times $$ 10⁴ turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10 $$\pi $$² $$\Omega $$, the total charge flowing through the coil during this time is

Figure shows a circuit that contains three identical resistors with resistance R = 9.0 $$\Omega $$ each, two identical inductors with inductance $$L$$ = 2.0 mH each, and an ideal battery with emf $$\varepsilon = 18V$$. The current $$i$$ through the battery just after the switch closed is

In an electromagnetic wave in free space that root mean square value of the electric field is E_rms = 6 V m^$$-$$1. The peak value of the magnetic field is

The ratio of resolving powers of an optical microscope for two wavelength $$\lambda $$₁ = 4000 $$\mathop A\limits^ \circ $$ and $${\lambda _2}$$ = 6000 $$\mathop A\limits^ \circ $$ is

A capacitor is charged by a battery. The battery is removed and another identical unchanged capacitor is connected in parallel. The total electrostatic energy of resulting system

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle $$\theta $$, the spot of the light is found to move through a distance y on the scale. The angle $$\theta $$ is given by

A thin prism having refracting angle 10^o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be

Two polaroids P₁ and P₂ are placed with their axis perpendicular to each other. Unpolarised light $$I$$₀ is incident on P₁. A third polaroid P₃ is kept in between P₁ and P₂ such that its axis makes an angle 45^o with that of P₁. The intensity of transmitted light through P₂ is

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is

The photoelectric threshold wavelength of silver is 3250 $$ \times $$ 10^$$-$$10 m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 $$ \times $$ 10^$$-$$10 m is
{Given h = 4.14 $$ \times $$ 10^$$-$$15 eV s and c = 3 $$ \times $$ 10⁸ m s^$$-$$1 ]

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

Which one of the following represents forward bias diode ?

The given electrical network is equivalent to

The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'P', the fractional decrease in radius is

Preeti reached the metro station and found that the escalator was not working. She walked up the sationary escalator in time t₁. On another days, if she remains stationary on the the moving escalator, then the escalator takes her up in time t₂. The time taken by her to walk up on the moving escalator will be

The x and y coordinates of the particle at any time are x = 5t $$-$$ 2t² and y = 10t respectively, where x and y are in metres and t in seconds. The acceleration of the particle at t = 2 s is

One end of string of length $$l$$ is connected to a particle of mass 'm' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed '$$\upsilon $$', the net force on the particle (directed towards centre) will be (T represents the tension in the string)

Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively

Consider a drop of rain water having mass 1 g falling from a height of 1 km. It hits the ground with a speed of 50 m s^$$-$$1. Take 'g' constant with a value 10 m s^$$-$$2. The work done by the (i) gravitational force and the (ii) resistive force of air is

Which of the following statements are correct ?

(1)   Centre of mass of a body always coincides with the centre of gravity of the body.

(2)   Centre of mass of a body is the point at which the total gravitational torque on the body is zero.

(3)   A couple on a body produces both translational and rotational motion in a body

(4)   Mechanical advantage greater than one means that small effort can be used to lift a large load.

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities $${\omega _1}$$ and $${\omega _2}$$. They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is

The acceleration due to gravity at a height at a height 1 km above the rearth is the same as at a depth d below the surface of earth. Then

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will

A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is

A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K₁ and K₂. The thermal conductivity of the composite will be

Thermodynamic processes are indicated in the following diagram.


Match the following

Column-1			Column-2
P.	Process I		A.	Adiabatic
Q.	Process II		B.	Isobaric
R.	Process III		C.	Isochoric
S.	Process IV		D.	Isothermal

A gas mixture consists of 2 moles of O₂ and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

A carnot engine having an efficiency of $${1 \over {10}}$$ as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

A spring of force constant k is cut into lengths of ratio 1 : 2 : 3. They are connected in series and the new force constant is K'. Then they are connected in parallel and force constant is k''. Then k' : k'' is

A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in second is

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?

A physical quantity of the dimensions of length that can be formed out of c, G and $${{{e^2}} \over {4\pi {\varepsilon _0}}}$$ is [c is velocity of light, G is the universal constant of gravitation and e is charge]