Work of electric motor is
An electric motor is used to convert electrical power into mechanical power. Reverse is done by turbines, generators and dynamos and conversion of DC to AC is done using rectifiers.
The order of wavelength of X - ray is
A resistor of 0.5 Ω is connected to another resistor in parallel combination to get an equivalent resistance of 0.1 Ω. The resistance of the second resistor is
Two photons of energies twice and thrice the work function of a.metal are incident On the metal surface. Then the ratio of maximum velocities of the photoelectrons emitted in the two cases respectively is
A plumb line is suspended from a ceiling of a ear moving with horizontal acceleration of a. What will be the angle of inclination with vertical?
Which of the following is discovered from the discharge tube experiment?
The internal resistance of a cell of e.m.f. 2 V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell will be
A particle of mass m at rest decays into two masses m₁ and m₂ with non-zero velocities. The ratio of de-Broglie wavelengths of the masses λ₁/λ₂ is
In Millikan's experiment, an oil drop having charge q gets stationary on applying a potential differnce V in between two plates separated by a distance 'd'. The weight of the drop is
When a proton is accelerated through 1 V, then its kinetic energy will be
A small coil of radius r is placed at the centre of a large coil of radius h (where R >> r). The two coils are coplanar. The mutual inductance between the coil is proportional to
The work function of aluminium 4.2 eV. If two protons, each of energy 3.5 eV strike and electron of aluminimum, then emission of electrons will be
Which scientist experimentally proved the existance of electromagnetic waves?
In T.V. broadcasting both picture and sound are transmitted simultaneously. In this
A dust particle of mass 10−3 gm is stationary between the plates of a horizontal parallel plate capacitor of 0.016m separation which is connected to a voltage of 100V. How many fundamental charges (e = 1.6 x 10 − 19 C) the dust particle carries
Two spherical conductors A and B having equal radii and carrying equal charges on them, repel each other with a force F, when kept apart at some distance. A third spherical conductor C having same radius as that of A, but uncharged, is brought in contact with A, then brought in contact with B and finally removed away from both. The new force of repulsion between the conductors A and B is
Two bodies of equal mass m go around a circular path of radius R under the action of their mutual gravitional attraction, in such a way that they remain opposite to each other. The speed of each body is
On a cold morning, a metal surface will feel colder to touch than a wooden surface because
At a given temperature, the pressure of an ideal gas of density ρ is proportional to
A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the balance reads 49 N when the lift is stationary. If the lift moves downwards with an acceleration of 5 m/s2, the reading of the spring balance would be
The magnetic dipole moment of a current loop is independent of
A bar magnet is equivalent to a current-carrying
At the neutral point, horizontal component of the magnetic field due to a magnet is
How much force is required to produce an elongation of 0.2% in the length of a brass wire of diameter 0.6 mm? (Take Young's modulus for brass = 0.9x1011 N-m⁻2)
Two spheres of equal masses but radii r1 and r2 are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities are
If in a nuclear reactor using U235 as fuel, the power output is 4.8 mega watts, the number of fissions per second is:
(energy released per fission of U235 = 200 MeV; 1eV = 1.6 x 10−19 J)
The difference between the mass of a nucleus and the total mass of the constituents is its
Two points are located at a distance of 10 m and 15 m from the source of oscillation . The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/sec. What is the phase difference between the oscillations of two points ?
α- particle is equivalent to
A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter is equal to 3/4 the angle of prism. The angle of deviation is
A body of moment of inertia of 3 kg-m2 rotating with an angular velocity of 2 rad-s⁻1 has the same kinetic energy as a body of mass of 12 kg moving with a velocity of
Fraunhofer spectrum is a
A solid cylinder 30 cm in diameter at the top of an inclined plane 2.0 m high is released and rolls down the incline without loss of energy due to friction. Its linear speed at the bottom is
A body of mass 'm' when hung from a long and light spring stretches by 20cm. The period of vibration of the mass when pulled down and released is
Electrical conductivity of a semiconductor
The impurity atom added to germanium to make it n-type semiconductor is
Time-taken by a 836 W heater to heat 1 L of water from 10°C to 40°C is
Heat given to a body which rises its temperature by 1°C is
Air in a cylinder is suddenly compressed by a portion, which is then maintained at the same position, with the passage of time
If radius of a circle is 2.14 m, then area of the circle, with due regards for significant figures, will be
An organ pipe P1 closed at one end vibrating in its first overtone and another pipe P2 open at both ends vibrating in its third overtone are in resonance with a given tuning fork. The ratio of lengths of P1 and P2 is
Ultrasonic waves are produced by
Two springs, having spring constants of 25 N-m⁻1 and 16 N-m⁻1are stretched by forces F₁ and F₂.If work done in stretching the springs is equal, then the ratio of the forces F₁ and F₂ is
A constant power P is applied to a car starting from rest. If v is the velocity of the car at time t, then
A ball of mass 400 gm is dropped from a height of 5 m. A boy on the ground hits the ball vertically upwards with a bat with an average force of 100 N so that it attains a vertical height of 20 m. The time for which the ball remains in contact with the bat is [g = 10 m/s2]
What is X?
The nitride ion in lithium nitrate is composed of
Which is correct statement about proton?
Which of the following does not show electromeric effect?
A σ - bond is
Which of the following has magnesium?
Vinegar made from cane sugar, now-a-days synthetically contains
The molecule which has the largest dipole moment amongst the following is
The number and type of bonds between two carbon atoms in calcium carbide are
The enthalpies of formation of HF and HCI are -161 KJ and -92 KJ respectively. which of the following statement is incorrect?
Standard molar enthalpy of formation of CO₂ is equal to
A vessel at equilibrium, contains SO₃, SO₂ and O₂. Now some helium gas is added, so that total pressure increases while temperature and volume remain constant. According to Le-Chatelier's principle, the dissociation of SO₃
In the reversible reaction of the type A + B AB. In general
The half life of a reaction is found to be inversely proportional to the cube of its initial concentration of the reactants. The order of the reaction is
Hess's law deals with
In the terminal stage of PSLV-C4, the fuel used is
PSLV-C4, launched on 12-Sept-2002, is the seventh flight of Polar Satellite Launch Vehicle (PSLV). It is 44.4 meter tall, 295 metric ton PSLV has four stages using solid and liquid propulsion systems alternately.
The first stage is amongst the largest solid propellant boosters in the world and carries 138 metric tons of Hydroxyl Terminated Poly Butadiene (HTPB) based propellant. It develops a maximum thrust of about 4,628 kilo Newton (kN).
The second stage carries 40 tons of liquid propellant, Unsymmetrical Di-Methyl Hydrazine (UDMH) as fuel and Nitrogen tetroxide (N2O4) as oxidizer. It generates a maximum thrust of about 725 kN.
The third stage of PSLV-C4 uses 7.6 tonne of HTPB-based solid propellant and produces a maximum thrust of 260 kN.
The fourth and the terminal stage of PSLV has a twin engine configuration using liquid propellant loading of 2.5 tons (Mono-methyl hydrazine (MMH) as fuel and Mixed Oxides of Nitrogen as oxidizer),each of these engines generates a maximum thrust of 7.4 kN.
Which of the following alkanes has neither secondary nor tertiary hydrogens ?
The complex diaquatriammine cobalt (III) chloride is represented as
Which one of the following will not show geometrical isomerism?
Which of the following is not a strong electroyte?
Oxidation number of S in H₂S₂O₈ is
Green house effect was first described by
The quantity of electricity required to liberate 112 cm3 of hydrogen at STP from acidified water is
The metal which cannot be obtained by electrolysis of aqueous solution of its salts is
Pyrolusite is /an
Air at sea level is dense. This is a practical application of
The total pressure exerted by a number of non-reacting gases is equal to the sum of the partial pressure of the gases under the same conditions is known as
The element which never acts as reducing agent in a chemical reaction is
Which of the following is the strongest acid?
Which of the following is most dense?
The ionic product of water will increase if
The product of the concentration of hydronium ions and hydroxyl ion in pure water or in any acidic or basic solution is constant at a particular temperature.
It is known as ionic product of water.
It is designated as Kw
The value of Kw increases with the increase in temperature
Gabriel synthesis is used for the preparation of
Increasing order of pka values (pKa = - log ka) pka of H2O, CH3OH and C6H5O H is :
value of H2O is 15.7, C6H5OH is 9.95 and CH3OH is 16 so C6H5OH< H2O <CH3OH
Which is not the resonance structure of aniline?
Which of the following is used in asbestos?
Duma's method involves the determination of nitrogen content in the organic compound in form of
Carbon and hydrogen are estimated by
The oxidation number of carbon in CH₂O is
The molality of a solution having 18g of glucose (mol.wt.=180) dissolved in 500g of water is
9.8 g of H₂SO₄ is present in 2 litres of a solution. The molarity of the solution is
Which of the following properties is not of transition elements ?
A solute is soluble in two immiscible liquids which are present in the mixture. The concentration of the solute in the upper layer will be
Which is absorbed in maximum amount by activated charcoal?
High purity copper metal is obtained by
Calyptra is seen in
Casparian strips contain
In meiosis disjunction of chromosomes occurs during
Gametophytic generation is dominant in
Which one ensures maintenance of chromosome number generation after generation ?
Which of the following shows the aquatic ancestry of bryophytes
Which of the following characteristics of the skeletons of frogs are adaptations for jumping?
Acetabularia used in hammerling's nucleocytoplasmic experiments is
Carrier molecules facilitating transport across cell membrane are
Neutrophils promote adhesion of neutrophils to endothelium, attract other neutrophils, monocytes and eosinophils and dilate capillaries by secreting
In Drosophila sex is determined by
An animal having characters of both male and female is
If Abhishek has type O+ blood, then which of the following is true?
Which mineral is essential for coagulation to occur?
In a population, unrestricted reproductive capacity is called as :
Which of these is a procoagulant?
The first case of IVF-ET technique success, was reported by :
This is the method of birth control :
The 10% energy transfer law of food chain was given by
The importance of ecosystem lies in
Goitre can occur as a consequence of all the following except
During menstruation the level of progesterone in the blood is
In colon, constrictions of its wall form a series of small pockets called
Which of the following correctly matches a digestive enzyme with its source?
In Pinus, male cone bears a large number of
Who coined the term zymase for enzymes in Yeast?
Two dominant independently assorting genes react with each other. They are
ATPase enzyme needed for muscle contraction is located in
Which of the following statements is correct?
In the roots of Cycas are found
Cells involved in immune mechanism are
Fovea centrails of human retina is characterised by
How many types of gamete will be formed from AaBbCc cell?
Test cross is a cross between
AIDS related complex or ARC is
A disease due to allergic reaction is
Bacteria were discovered by
Auxospores and hormocysts are formed respectively by
The bacillariophycean members (diatoms) form about 20% of all primary productions. These are microscopic, eukaryotic, unicellular or colonial coccoid algae. These algae are sexually reproduced by the formation of auxospores in most cases. Bozi (1914) and Fremi (1930) reported that short setions of living cells at the tips of the trichomes of Wertiella lanosa become invested by a thick, lamellated, pigmented sheath. Such multicellular spore like structures function as perennating bodies. They are specially modified hormogones and are called hormospores or hormocysts Desikachary (1948) calls them pseudohormogonia.
Dinosaurs became extinct in
Rh factor is named after
True coelom or body cavity occurs in
True coelom or body cavity occurs in
The ion controlling stomatal movement is
The process by which energy released during electron transfer, in aerobic respiration coupled to the production of ATP, is termed as
Which of the following is not caused by deficieny of mineral nutrition?
Antennae of Cockroach are
The distal parts of Malpighian tubules in cockroach
Identify the correctly matched pair
Growth rings are well marked in trees growing in
Dorsal blood vessel of Earthworm is collecting tube in
In Pineapple,the fruit is
In Pheretima, septa are absent between which segments?
Thick walled, lignified cells which provide mechanical support are called
Water storage tissue has
The application of engineering and technological principles to the life sciences is called
The chemical substance, derived from living organisms having inhibitory effect on parasitic organism, is known as
Biotic factors refer to
The main function of cerebrospinal fluid is
Which one of the following fishes is a living fossil ?
The conversion of nitrate to nitrous oxide and nitrogen gas is termed as
Modified antibiotics are manufactured by the technique of
A new strain of bacteria produced by biotechnology in alcohol industry is
Rubber is obtained from
Genetic engineered bacteria is used for the production of
The organism used for alcohol fermentation is
Death of protoplasm is a pre-requisite for a vital function like
BOD (biological oxygen demand) is
Soil pollutants affecting food chains and food webs by killing microorganisms are
The radioactive pollution is caused by
In flatworms the excretory organs are
Lignin occurs in
An asexually produced organism inheriting all the characters of its parent is called
Which one is a simple protein?
Intraspecific incompatibility is overcome by
Xenia and metaxenia terms are related with
11th July is celebrated as
Scholars caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. 40 of them were marked. The number of fishes in the pond is
The corpus luteum is formed at the site of
Testosterone levels in males are regulated by
Gram belongs to the family-