The contractile protein of skeletal muscle involving ATPase activity is

In photosystem I, the first electron acceptor is

How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to CO₂ and H₂O yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of one mole of ATP is 12 kcal?

Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?

An enzyme that can stimulate germination of barley seeds is

How does pruning help in making the hedge dense?

Treatment of seeds at low temperature under moist conditions to break its dormancy is called

The majority of carbon dioxide produced by our body cells is transported to the lungs as

Which one of the following statements is incorrect?

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at altitude to 5400 metres have around 8 million. This is because at high altitude

Which one of the following has an open circulatory system?

Angiotensinogen is a protein produced and secreted by

During photorespiration, the oxygen consuming reaction(s) occur in

Bowman's glands are found in

Which one of the following does not act as a neurotransmitter?

Which hormone causes dilation of blood vessels, increased oxygen consumption and glucogenesis?

Which of the following is an accumulation and release center of neurohormones?

A steroid hormone which regulates glucose metabolism is

Which one of the following statements is correct?

Which one of the following is not a secondary messenger in hormone action?

Parthenocarpic tomato fruits can be produced by

In a cereal grain the single cotyledon of embryo is represented by

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

Sertoli cells are regulated by the pituitary hormone known as-

Which one of the following is not a living fossil?

Curing of tea leaves is brought about by the activity of

Which of the following environmental conditions are essential for optimum growth of Mucor on a piece of bread?
A.   Temperature of about 25^o C
B.   Temperature of about 5^o C
C.   Relative humidity of about 5%
D.   Relative humidity of about 95%
E.   A shady place
F.   A brightly illuminated place
Choose the answer from the following options.

Peat moss is used as a packing material for sending flowers and live plants to distant places because

Conifers differ from grasses in the

In a moss, the sporophyte

Two common characters found in centipede, cockroach, and crab are

Biradial symmetry and lack of cnidoblasts are the characteristic of

In which one of the following sets of animals do all the four give birth to young ones?

Withdrawal of which of the following hormones is the immediate cause of menstruation ?

Annual migration does not occur in the case of

Which one of the following is a matching set of a phylum and its three examples?

Metameric segmentation is the characteristic of

What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

Pentamerous actinomorphic flowers, bicarpellary ovary with oblique septa, and fruit capsule or berry, are characteristic features of

In which of the following fruits, the edible part is the aril ?

Pineapple (ananas) fruit develops from

Long filamentous threads protruding at the end of a young cob of maize are

An organic substance bound to an enzyme and essential for its activity is called

Which one of the following is not included under in-situ conservation ?

Restriction endonuclease -

Two microbes found to be very useful in genetic engineering are-

Golden rice is a promising transgenic crop. When released for cultivation, it will help in

Niche overlap indicates-

Which one of the following is not used for construction of ecological pyramids ?

Which of the following pairs of an animal and a plant represents endangered organisms in India ?

Which of the following is considered a hot-spot of biodiversity in India ?

Antibodies in our body are complex-

Which one of the following is the correctly matched pair of an endangered animal and a National Park ?

A common structural feature of vessel elements and sieve tube elements is-

Areolar connective tissue joins-

Mast cells secrete-

Earthworms are -

Which of the following statements regarding mitochondrial membrane is not correct ?

Which of the following statements regarding cilia is not correct ?

A major breakthrough in the studies of cells came with the development of electron microscope. This is because

One turn of the helix in a B-form DNA is approximately -

The formula for exponential population growth is-

Test cross involves-

Both sickle cell anemia and Huntington's chorea are-

If a colour blind woman marries a normal visioned man, their sons will be

Cri-du-chat syndrome in humans is caused by the-

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F₂ generation of the cross RRYY × rryy ?

Sickle cell anaemia has not been eliminated from the African population because-

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

Which one of the following is an example of polygenic inheritance ?

Phenotype of an organism is the result of-

One gene-one enzyme hypothesis was postulated by -

Which antibiotic inhibits interaction between tRNA and mRNA during bacterial protein synthesis ?

Antiparallel strands of a DNA molecule means that-

Amino acid sequence, in protein synthesis is decided by the sequence of -

Which one of the following amino-acids was not found to be synthesized in Miller's experiment ?

An important evidence in favour of organic evolution is the occurrence of-

Praying mantis is a good example of-

Jurassic period of the Mesozoic era characterized by-

The bacterium (Clostridium botulinum) that causes botulism is-

The causative agent of mad-cow disease is a-

A person showing unpredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from-

HIV that causes AIDS, first starts destroying

Copper sulphate dissolves in excess of KCN to give

[Cr(H₂O)₆]Cl₃ (At. no. of Cr = 24) has a magnetic momen of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

[Co(NH₃)₄(NO₂)₂]Cl exhibits

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

In a set of reactions propionic acid yielded a compound D.

The structure of D would be

Which of the following is more basic than aniline?

The human body does not produce

Which one of the following is a peptide hormone?

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process-

are respectively

During osmosis, flow of water through a semipermeable membrane is

A solution of acetone in ethanol

1.00 g of a non-electrolyte solute (molar mass 250 g mol^$$-$$1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K kg mol^$$-$$1, the freezing point of benzene will be lowered by

A solution containing 10 g per dm³ of urea (molecular mass = 60 g mol^$$-$$1) is isotonic with a 5% solution of a nonvolatile solute is

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields

E^o_Fe²⁺/Fe = $$-$$ 0.441 V and E^o_{Fe³⁺/Fe²⁺} = 0.771 V, the standard EMF of the reaction Fe + 2Fe³⁺ $$ \to $$ 3Fe²⁺ will be

A hypothetical electrochemical cell is shown below.

$$A\left| {{A^ + }\left( {xM} \right)} \right|\left| {{B^ + }\left( {yM} \right)} \right|B$$

The emf measured is + 0.20 V. The cell reaction is

Consider the reaction :  N_2(g) + 3H_2(g) $$ \to $$ 2NH_3(g)

The equality relationship between $${{d\left[ {N{H_3}} \right]} \over {dt}}$$ and $$ - {{d\left[ {{H_2}} \right]} \over {dt}}$$ is

For the reaction, 2A + B $$ \to $$ 3C + D, which of the following does not express the reaction rate?

Which of the following is the most basic oxide?

The correct order regarding the electronegativity of hybrid orbitals of carbon is

In which of the following molecules are all the bonds are not equal?

Which one of the following orders is not in accordance with the property stated against it?

The electronegativity difference berween N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5D) is larger than that of NF₃ (0.2 D). This is because

In which of the following pairs are both the ions coloured in aqueous solution?
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

For the reaction :
CH4_(g) + 2O_2(g) $$\rightleftharpoons$$ CO_2(g) + 2H₂O_(l),
$$\Delta $$H_r = $$-$$ 170.8 kJ mol^$$-$$1.
Which of the following statements is not true?

The orientation of an atomic orbital is governed by

Given : The mass of electron is 9.11 $$ \times $$ 10^$$-$$31 kg, Planck constant is 6.626 $$ \times $$ 10^$$-$$34 J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 $$\mathop A\limits^ \circ $$ is

Which one of the following orders is not in accordance with the property stated against it ?

Which of the following is not a correct statement?

Which of the following is not isostructural with SiCl₄ ?

Which of the following species has a linear shape?

Identify the correct statement for change of Gibb's energy for a system ($$\Delta $$G_system) at constant temperature and pressure.

The enthalpy and entropy change for the reaction:
Br_2(l) + Cl_2(g) $$ \to $$ 2BrCl_(g)
are 30 kJ mol^$$-$$1 and 105 J K^$$-$$1 mol^$$-$$1 respectively.
The temperature at which the reaction will be in equilibrium is

The enthalpy of hydrogenation of cyclohexene is is $$-$$ 119.5 kJ mol^$$-$$1. If resonance energy of benzene is $$-$$ 150.4 kJ mol^$$-$$1, its enthalpy of hydrogenation would be

Assume each reaction is carried out in an open container. For which reaction will $$\Delta $$H = $$\Delta $$E ?

Which of the following pairs constitutes a buffer?

The hydrogen ion concentration of a 10^$$-$$8 M, HCl aqueous solution at 298 K (K_w = 10^$$-$$14) is

The general molecular formula, which represents the homologous series of alkanols is

The IUPAC name of



is

Which of the following is not chiral?

The general molecular formula, which represents the homologous series of alkanols is

Ethylene oxide when treated with Grignard reagent yields

The major organic product in the reaction is

CH₃ $$-$$ O $$-$$ CH(CH₃)₂ + HI $$ \to $$ products

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $$\alpha $$-hydrixy acid. The carbonyl compound is

Nucleophilic addition reaction will be most favoured in

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency $$f$$. If L is doubled and C is changed to 4C, the frequency will be

An electric dipole of moment $$\overrightarrow p $$ is lying along a uniform electric field $$\overrightarrow E $$. The work done in rotating the dipole by 90^o is

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will

Kirchoff's first and second laws of electrical circuits are consequences of

Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r₁ and r₂ (r₁ > r₂) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is

Power dissipated across the 8 $$\Omega $$ resistor in the circuit shown here is 2 watt. The power dissipated in watt units across the 3 $$\Omega $$ resistor is

When a charged particle moving with velocity $$\overrightarrow v $$ is subjected to a magnetic field of induction $$\overrightarrow B $$, the force on it is non-zero. This implies that

Two circular coils 1 and 2 are made from the same wire but the radius of the 1^st coil is twice that of the 2^nd coil. What is the ratio of potential difference in volts should be applied across them so that the magnetic field at their centres is the same?

Curie temperature above which

Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is

A coil of inductive reactance 31 $$\Omega $$ has a resistance of 8 $$\Omega $$. It is placed in series with a condenser of capacitative reactance 25 $$\Omega $$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is

The core of a transformer is laminated because

A square surface of side L metres is in the plane of the paper. A uniform electric field $$\overrightarrow E $$ (volt/m), also in the plane of the paper is limited only to the lower half of the square surface (see figure). The electric flux in SI inits associated with the surface is

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is

When photons of energy h$$\upsilon $$ fall on an aluminimum plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be

A photocell employs photoelectric effect to convert

The momentum of a photon of energy 1 MeV in kg m/s will be

In a discharge tube ionization of enclosed gas is produced due to collisions between

Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emited by hydrogen will be

The binding energy of deuteron is 2.2 MeV and that of $${}_2^4$$He is 28 MeV. If two deuterons are fused to form one $${}_2^4$$He then the energy released is

The following figure shows a logic gate circuit with two inputs A and B and the output C.



The voltage waveforms of A, B and C are as shown below.



The logic circuit gate is

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity $$\omega $$. The force exerted by the liquid at the other end is

Two bodies A (of mass 1 kg) and B (of mass 3 kg) are dropped from heights of 16 m and 25 m, respectively. The ratio of the time taken by them to reach the ground is

A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds for every circular lap. The average velocity and average speed for each circular lap respectively is

A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by x = 40 + 12t $$-$$ t³. How long would the particle travel before coming to rest ?

For angles of projection of a projectile at angle (45^o $$-$$ $$\theta $$) and (45^o + $$\theta $$), the horizontal range described by the projectile are in the ratio of

The vectors $$\overrightarrow A $$ and $$\overrightarrow B $$ are such that $$\left| {\overrightarrow A + \overrightarrow B } \right| = \left| {\overrightarrow A - \overrightarrow B } \right|.$$ The angle between the two vectors is

A 0.5 kg ball moving with a speed of 12 m/s strikes a hand wall at an angle of 30^o with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 seconds, the average force acting on the wall is :

300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Work done against friction is (Take g = 10 m/s²)

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = $${1 \over 3}$$t², where t is in seconds. Work done by the force in 2 seconds is

The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it 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 ml²/3, the initial angular acceleration of the rod will be

The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc

The earth is assumed to be a sphere of radius R. A platform is arranged at a height R from the surface of the earth. The escape velocity of a body from this platform is fv, where v is its escape velocity from the surface of the Earth. The value of f is

A black body at 1227^oC emits radiations with maximum intensity at a wavelength of 5000 $$\mathop A\limits^ \circ $$. If the temperature of the body is increased by 1000^oC, the maximum intensity will be observed at

The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency ?

A rectangular block of mass m and area of cross-section A floats in a liquid of density $$\rho $$. If it is given a small vertical displacement from equilibrium it undergoes with a time period T, then

Two vibrating tuning forks produce waves given by y₁ = 4 sin 500$$\pi $$t and y₂ = 2 sin506 $$\pi $$t. Number of beats produced per minute is

Two sound waves with wavelengths 5.0 m and 5.5. m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second.

The time of reverberation of a room A is one second. What will be the time (in seconds of reverberation of a room, having all the dimensions double of those of room A ?

A transverse wave propagating along x-axis is represented by y(x, t) = 8.0 sin (0.5 $$\pi $$x $$-$$ 4$$\pi $$t $$-$$ $$\pi $$/4) where x is in metres and t is in seconds. The speed of the wave is

Which one of the following statements is true ?

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulting handle. As a result the potential difference between the plates

Which one of the following represents forward bias diode ?

The velocity v of a particle at time t is given by v = at + $${b \over {t + c}}$$, where a, b and c are constants. The dimensions of a, b and c are