Large transformers, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to
The penetrating power of X - rays increases with the
Capacity of a conductor depends upon
If 2.2 kW power is transmitted through a 10 Ω line at 22000 V, the power loss in the form of heat will be
The potential difference across the terminals of a battery is 50V when 11A current is drawn and 60V when 1A current is drawn. The e.m.f. and the internal resistance of the battery are
The magnetic flux linked with a coil is given by the equation: φ = 3t2+4t+9 Wb.The magnitude of e.m.f. induced at t = 2 s is
For driving a current of 2 A for 6 minutes in a circuit, 1000 J of work is to be done. The e.m.f. of the source in the circuit is
The driver of a car travelling at velocity υ suddenly see a broad wall in front of him at a diatance d. He should
Heat radiations propagate with the speed of
The electric flux from a cube of edge a is φ. What will be its value if edge of cube is made 3a and charge enclosed is doubled?
Van de Graaff electrostatic generator is based on
If both the mass and radius of the earth decreases by 1%
The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is V. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is
Assuming the coefficient of friction between the road and tyres of a car to be 0.5, the maximum speed with which the car can move round a curve of 40.0 m radius without slipping. if the road is unbanked, should be
On a new scale of temperature (which is linear) and called the W scale the freezing and boiling points of water are 39º W and 239º W respectively. What will be the temperature on the scale, corresponding to a temperature of 39º C on the Celsius scale ?
What is the path difference for destructive interference?
Under which of the following conditions is the law PV = RT obeyed most closely by a real gas
If 2% of the current is to be passed through the galvanometer of resistance G, then the resistance of the shunt required is
A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is
If in a moving coil galvanometer, a current I in its coil produces a deflection θ, then
The magnetic field at a point at a distance 'd' from the centre on axial line of a very short bar magnet of magnetic moment M is B. The magnetic field at a distance '2d' from centre on equitorial line of magnet of magnetic moment 8 M, will be
The magnetic field due to short bar magnet at a point in tan A position is 200gauss. Then the magnetic field at a point at the same distance in tan B position is
The couple acting on a magnet of length 10cm placed in a uniform magnetic field of intensity 40N/wb such that the axis of the magnet makes 45º with the field direction is √2 ∕ 10 Nm. The pole strength of the magnet in webers
Water enters in a horizontal pipe of radius 2 cm with a velocity of 1 m-s-1. If the water comes from the nozzle with a velocity of 4 m-s-1, then radius of the nozzle is
Sixty four spherical rain drops of equal size are falling vertically through air with a terminal velocity 1.5 m-s⁻1. If these drops coalesce to form a big spherical drop, then terminal velocity of big drop is
Two similar wires under the same load yield elongations of 0.1 mm and 0.05 mm respectively. If the area of cross-section of the first wire is 4 mm2, then the area of cross-section of the second wire is
A body at rest is dropped from a height h and strikes the ground with a velocity 3 m/s. Another body of same mass is dropped from the same height with an initial velocity of 4 m/s. The final velocity of second mass, with which it strikes the ground, is (take g=10 m/s2)
Using v2 = u2 + 2 as
(3)2 = 0 + 2 g x s or 2 gs = 9
when initial velocity is 4 m/s, then
v2 = 42 + 2 gs = 16 + 9 = 25 or v = 5 m/s.
A body of moment of inertia of 3 kg-m2 rotating with an angular velocity of 2 rad/sec has the same kinetic energy as a mass of 12 kg moving with a velocity of
Three light strings are connected at the point P. A weight W is suspended from one of the strings .End A of string AP and end B of string PB are fixed as shown. In equilibrium PB is horizontal and PA makes an angle of 60º with the horizontal. If the tension in PB is 30 N then the tension in PA and weight W are respectively
In two isotopes of an element the number of protons in their nuclei will be --- and number of neutrons in their nuclei will be
β decay means emission of electron from
The hypermetropia is a
When the light source is kept 20 cm away from a photocell, stopping potential is 0.6 V is obtained. When the source is kept 40 cm away, the stopping potential will be
In a simple pendulum, if K.E. is one fourth of total energy, then displacement (x) is related to amplitude A, as
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
The range of projectile when launched at an angle of 15º with the horizontal is 1.5 km. What is the range of the projectile when launched at an angle of 45º to the horizontal
The Horizontal Range of Projectile motion is given by
A couple produces a
A particle executes simple harmonic motion with a frequency with which its kinetic energy oscillates is
A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is
Rainbow is due to
A plano convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
Brilliance of diamond is due to
In a simple pendulum, the period of oscillation (T) is related to the length of the pendulum (L) as
An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?
When the P end of P-N junction is connected to the negative terminal of the battery and the N end to the positive terminal of the battery, then the P-N junction behaves like
Doping of a semiconductor (with small traces of impurity atoms) generally changes the resistivity as follows
The excess of pressure due to surface tension in a spherical liquid drop of radius r is directly proportional to
Antimony and Bismuth are usually used in a thermocouple, because
An electric bulb is designed to draw power P0 at voltage V0. If the voltage is V it draws a power P. Then
The amount of heat produced in a conductor, due to the flow of current, is directly proportional to
When a liquid is heated its density
A Carnot's engine has an efficiency of 50% at sink temperature 50º C . Calculate the temperature of source.
A physical quantity P is related with four variables a, b, c and d as : P =a3 b2/√c.d. The error of measurement in a, b, c and d are 1%, 3%, 4% and 2% respectively. What is the error in the quantity P?
The first law of thermodynamics is concerned with the conservation of
The dimensional formula for angular velocity is
When two coherent monochromatic light beams of intensities I and 4I are superimposed, the ratio between maximum and minimum intensities in the resultant beam is
Which of the following phenomena establish the wave nature of light?
When a tuning fork A of unknown frequency is sounded with another tuning fork B of frequency 256 Hz, then 3 beats per second are observed. After that A is loaded with wax and sounded, the again 3 beats per second are observed. The frequency of the tuning fork A is
A rod elongates by l when a body of mass M is suspended from it. The work done is
Two wires are in unison. If the tension in one of the wires is increased by 2%, 5 beats are produced per second. The initial frequency of each wire is
Fill in the blank with appropriate word.
.......... works of reference are so valuable as the Encyclopaedia Britannica.
The IUPAC name of the componund having the formula (CH3)3 C - CH = CH2 is
1-Chlorobutane on reaction with alcoholic potash gives
1-Butyne reacts with cold alkaline KMnO₄ to yield
By passing H₂S gas in acidified KMnO₄, we get
The ratio of charge and mass would be greater for
The wavelengths of which series lie towards the ultraviolet?
The order of filling of electrons in the orbitals of an atom is
which of the following hybridisation occurs in the formation of methane molecule?
The bond order of O₂- is
Which of the following is soluble in water?
The enthalpy change of a reaction does not depend on
A schematic plot of ln Keq vs t-1 for a reaction is shown. The reaction must be
For a first order reaction, the half-life period is independent of
If 0.75 mole of an ideal gas is expanded isothermally at 27ºC from 15 litres to 25 litres, then work done by the gas during this process is (R=8.314J-K⁻1-mol⁻1)
The molar heat capacity of water at constant pressure is 75 J-K⁻1-mol⁻1. When 1.0 KJ of heat is supplied to 100 g of water, then increase in the temperature of water is
Which of the following ingredients is not used in sun burn creams?
CH₃CH₂CH₂CH(CH = CH₂)CH₂CH₂CH₃ is
The number of isomers exhinited by [Cr(NH₃)₃Cl₃] is
Which of the following are isoelectronic species?
are isoelectronics species.
(i) Number of electronsin
7+2 x (1) + 1 = 10
(ii) Number of electron in
7+4 x (1) - 1= 10
(iii) Number of electrons in NH3
7+3 x (1) = 10
(iv) Number of electrons in CH3
6+3 x (1) = 9
The difference of water molecules in gypsum and plaster of paris is
Out of Cu, Ag, Fe and Zn, the metal which can displace all others from their salt solutions is
If the weight of 5.6 liters of a gas at N.T.P. is 11 gram. The gas may be
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
When sodium chloride is dissolved in water, sodium ion is
What is the number of sigma (σ) and pi (π) bonds present in sulphric acid molecule?
Alkaline earth metals form ions of the formula
Which of the following phosphorus is most reactive?
The geometry of ClO₃¯ according to valence shell electron pair repulsion (VSEPR) theory will be
The alcohol manufactured from water gas is
The ion that can be preciitated by HCl as well as H₂S is
When a substance A react with water, it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with the solution of C. It produces the same gas B on warming but D can produce B on reaction with dilute sulphuric acid at room temperature. A imparts golden yellow colour to a smokeless flame of Bunsen burner. A,B,C,D respectively are
A solution contains 10 mL of 0.1 N NaOH and 10 mL of 0.05 N Na2SO4. pH of this solution is
Na2SO4 being a salt of strong acid and strong base is not hydrolysed pH would be greater than 7 due to NaOH
If pH values of P, Q, R and S are 9.5, 2.5, 3.5 and 5.5 respectively, then the strongest acid is
Acetic acid is manufactured by the fermentation of
Which of the following molecule contains asymmetric carbon atom?
Aqueous solution of sodium acetate is
The projectile, which experiences minimum repulsion on approaching a particular nucleus, is
The phenomenon of nuclear fission was experimentally observed by
When aqueous ethyl alcohol is distilled with bleaching powder the product obtained is
In its reaction with sodium, 1 mol of a compound X gives 1 mol of H₂. Which one of the following compounds might be X?
Dow's reaction involves
Calcium formate on dry heating yields
following step is :
CH3CH3 + Cl → CH3CH2 + HCl
Conc. HNO3 forms NO+2 in presence of :
The geometry of the compound [Pt(NH₃)₂Cl₂] is
The catalyst used in the manufacture of polythene by Zeigler method is
Steam distillation is used for the purification of
Which of the following compound is known as oil of winter green?
Oxidation number of C in C₆H₁₂O₆ is
Oxidation state of elemental carbon is
The Miller indices of a plane having intercepts 2a, 2b, ∞ are
The weight in grams of KCl(mol.wt. = 74.5) in 100ml of a 0.1M KCl solution is
Which out of the following is chiral in nature?
Which of the following is not a colligative property ?
In the case of autocatalysis
Atomic weight of bromine is 80,0.1 mole of ethylene absorbs following gram of bromine
Atomic wt. of Br = 80
∴ Atomic wt. of Br2 = 60
1 mole of ethylene absorbs = 160 gm or 1 mole of Br2
0.1 mole of ethylene absorbs = 16 gm or 0.1 mole of Br2.
The radius of La3⁺ (Atomic number of La = 57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu3⁺ (Atomic number of Lu = 71)?
Anhydrous salts of CuF₂ and CuSO₄ are
Waggle dance of honey bee indicates the direction of
Blood capillaries and lymph capillaries both
Indian honey bee is
Coelenterates differ from other animals in having :
If you had 10 RBCs each containing 100 molecules of hemoglobin, how many molecules of oxygen could these RBCs transport?
Number of chromosome groups at equatorial plate of metaphase I of a plant body having 2n = 50 chromosomes shall be
The average diameter of red blood corpuscles of man is
A piece of stomach wall is grafted into the skin of a mammal. The presence of food in the stomach causes this patch of stomach wall on the skin to produce gastric juices. This is evidence that the secretion of gastric juice is most likely brought about by
The secretion of cholecystokinin will be stimulated by the presence of
Individual members of one of the following pairs yields both oil and fibres
Saffron is obtained from
One of the following is a gift of Old World to New World
If by radiation all nitrogenase enzymes are inactivated, then there will be no
The flax fibres are obtained from
An ammonifying bacterium is
The term biocoenosis was coined by
Succulents occur in
TSH stands for
Somatostatin (GH) is secreted by
Which one carries genetic message to ribosomes
A genetic disease in many Africans which reduces the oxygen uptake by RBC is known as :
The wood of Pinus is -
Phenomenon where in the heterozygous state a phenotype intermediate to the dominant and recessive types is obtained is called
What is the function of copper-T?
Test cross is cross of :
Tranquilliser is drug used for
Membranous labyrinth is concerned with
Organisms attached to substratum generally possesses
Shape of lens in eye of vertebrates is altered by
Which area is not drained by the thoracic duct?
The thoracic duct empties directly into the _____ vein.
Testes descend into scrotum in mammals for
Exanthema is result of deficiency of
Jhoom cultivation refers to
Which molluscan group is primarily used in pearl production ?
Which is not required for synthesis of carbohydrates
Genetically dwarf plant can be made to grow taller by application of
In which one of the following pathogens do the cells of promycelium after the germination of teleutospore produce infection hyphae instead of basidiospores?
The plant hormone commercially used for fruit ripening is
The ingredient required for ATP synthesis is
In R.H. Whittaker's five-kingdom classification, Protista comprises
Locomotion is not known to occur in
Nitrogen fixation occurs in
Use of pesticides is problematic as
Blastocyst is blastula of
Eutrophication is found in
The plants face wilting due to the use of excessive fertilizers, because of
Electron transport system of mitochondria is located in
Self pollination is prevented by
Ovary is called inferior in
Most of the carbon dioxide in the blood is carried in the form of
NADH of glycolysis reacts with an inorganic element during liberation of energy. The respiration is
High concentrations of bicarbonate ion ( HCO3− ) in the blood will result
Flow of blood in dorsal blood vessel of Earthworm is
Phylloclade is a modification of
Replum is found in-
Movement of fluids from the glomerulus’s to Bowman’s capsule is due to
In Pheretima coleomic fluid contains