A step up transformer has transformation ratio of 3:2. What is the voltage in secondary if voltage in primary is 30 V
A photon of energy 2.5eV and wavelength λ falls on a metal surface and the ejected electrons have a velocity 'V' . If the wave length λ of incident light is decreased by 20%, the velocity of emitted electrons is doubled, then the work function of the metal is
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
If Planck's constant is given as 6.4 x 10 − 34 J − sec, and electron charge is 1.6 x 10−19 coulomb, the minimum wave length of X - rays emitted, when a 10 KeV electron is completely stopped by a target is
In a given network, each resistance has value of 6 Ω. The point X is connected to point A by a copper wire of negligible resistance and point Y is connected to point B by the same wire. The effective resistance between X and Y will be
When yellow light incident on a surface no electrons are emitted while green light can emit. If red light is incident on the surface then
Two resistances are joined in parallel whose resultant is 6/8 ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was
Which quantity is fixed of an object which moves in a horizontal circle at constant speed?
Who indirectly determined the mass of the electron by measuring the charge of the electron ?
Monochromatic light of frequency f incident on emitter having threshold frequency f0. The kinetic energy of ejected electron will be
If the momentum of a photon is p, then its frequency is
A coil has 1000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2 x 10 − 5 web ∕ m2. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in millivolts is
Maxwell's equation describe the fundamental laws of
The difference between soft and hard X-rays is
The capacitance of an isolated spherical conductor of radius 15 cm is
There is a uniform electric field of strength 103v/m along y axis.A body of mass 1gm and charge 10-6C is projected into the field from origin along the positive x-axis with a velocity 10m/s.Its speed in m/s after 10s is (neglect air resistance)
If the radius of the earth were to shrink by 1% its mass remaining same, the acceleration due to gravity on the earth's surface would
Mode of transmission of heat, in which heat is carried by the moving particles, is
The root mean square velocity of hydrogen molecules at 300 K is 1930 m/s. Then the r.m.s. velocity of oxygen molecules at 1200 K will be
A block of mass 10 kg is placed on a rough horizontal surface having coefficient of friction μ = 0.5. If a horizontal force of 100 N is acting on it, then acceleration of the block will be (Take g = 10 m−s⁻2)
Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry respectively 0.2 A and 0.3 A current in opposite direction. The magnetic field in telsa at the centre is
When 2 A current is passed through the coil of a tangent galvanometer, it gives a deflection of 45°. For 60° deflection, the current must be
A wire of length 2 m carrying a current of 1 A is bent to form a circle, the magnetic moment of the coil is
The surface tension of soap solution is 25x10⁻3 N-m⁻1. The excess pressure inside a soap bubble of diameter 1 cm is
Which of the following affets the elasticity of a substance?
In carbon cycle of fusion
After two hours, 1/16 of the initial amount of a certain radioactive isotope remains undecayed. The half life of the isotope is
Two radioactive substances A and B have decay constants 5 λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be (1/e)2 after a time interval
A particle is having kinetic energy 1/3 of the maximum value at a distance of 4 cm from the mean position. Find the amplitude of motion
A ray is incident on an equilateral prism of μ = 2 such that ray inside the prism goes parallel to the base. Find angle of minimum deviation?
A ray of light is incident on one of the refracting faces of an equilateral prism, at an angle of incidence 48 ° , in the minimum deviation position. The angle of deviation produced by the prism is
A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum
When the potential energy of a particle executing simple harmonic motion is one-fourth of its maximum value during the oscillation, the displacement of the particle from the equilibrium position in terms of its amplitude a is
A disc is of mass M and radius r. The moment of inertia of it about an axis tangential to its edge and in plane of the disc or parallel to its diameter is
p-type crystal of a p-n junction diode is connected to a positive terminal of battery and n-type crystal connected to negative terminal of battery
The impurity atom added to germanium to make it n-type semiconductor is
The equation of state for n moles of an ideal gas is PV = nRT, where R is a constant. The SI unit for R is
Two electric bulbs rated P₁ watt V volts and P₂ watt V volts are connected in parallel and V volts are applied to it. The total power will be
Two rods of the same length and diameter having thermal conductivities K1 and K2 are joined in parallel. The equivalent thermal conductivity of the combination is
Calcorimeters are made of which of the following
The relation between time the displacement for two particles is given by y₁ = 0.06 sin 2π (0.04t + φ₁) and y₂ = 0.03 sin 2π (1.04t + φ₂) The ratio of the intensity of the waves produced by the vibrations of the two particles will be
A transverse wave is represented by the equation y = y₀ sin 2π/λ (νt - x). for what value of λ is the maximum particle velocity equal to two times the wave velocity?
A boy comes running and sits on a rotating platform. What is conserved ?
A heavy body moving with a velocity 30 m/s and another small object at rest undergoes an elastic collision. The later will move with a velocity of
The average power required to lift a 100 kg mass through a height of 50 mts in approximately 50 seconds would be
Which of the following is most acidic?
Aldehydes and ketones do not give addition reaction with
An orbital in which n = 4 and l = 2 is expressed by
Which of the following is not isoelectronic?
Which of the following is the strongest nucleophile?
A negatively charged nucleophile is always stronger than a neutral one
Which of the following does not show electromeric effect?
Alpha-Tocopherol is found in
The final product 'C' in the above reaction is
The decreasing order of the boiling points of the following hydrides is
(i) NH3 (ii) PH3 (iii) AsH3 (iv) SbH3 (v) H2O
The bond angle around O in ice is closer to
The heat of formation of CO₂ is -94 Kcal mol⁻1 whereas ΔH for 2CeO₂ → 2CO is -110.5 Kcal,The enthalpy of combustion carbon is
For exothermic reactions to be spontaneous
The chemical equilibrium of a reversible reaction is not influenced by
The decomposition of a substance follows first order kinetics. If its conc. is reduced to 1/8 th of its initial value, in 24 minutes, the rate constant of decomposition process is
Hess's law deals with
Given the bond energies of N ≡ N , H − H and N − H bonds as 941.5, 433 and 391 kJ mole-1 respectively, the enthalpy of reaction N2(g) + 3H2(g) → 2 NH3 (g) is
Enthalpy of reaction = ∑ bond energyreactant - ∑ bond energyproduct
= bond energy (n2) + 3 x (bond energy) (h2) - 2 x (bond energy) (NH3)
= 941.5 + (3 x 433) - 2 x 3 x 391
= 2240.5 - 2346 = 105.4 ≅ -105kJ
Which one of the following does not have sp2 hybridised carbon ?
The rotenone is
A solution of potassium ferrocyanide would contain..........ions
CN⁻ is a strong field ligand. It is due to the fact
Two platinum electrodes were immersed in a solution of CuSO₄ and electric current was passed through the solution. After sometimes it was found that colour of CuSO₄ disappeared with evolution of gas at the electrode. The colourless solution contains
Both oxidation and reduction takes place in which of the following reaction?
Which one of the following metals will not reduce H2O?
The major proportion of carbon monoxide present in the atmosphere is due to
Which of the following has the highest conductivity?
Calcium is obtained by the
The van der Waal's equation explains the behaviour of
Pressure remaining constant at what temperature, the volume of a gas will be double of its volume at 0°C ?
Composition of glass is
The shape of the molecule SF₃Cl₃ is
Buffer solution can be obtained by mixing aqueous solution of
What is the conjugate base of OH⁻?
Which of the following amine will not respond to carbylamine reaction ?
Which of the following compounds can react with the Lewis base Cl− in a Lewis acid-base reaction?
Select correct statement(s)for the following reaction :
Polymer used in bullet proof glass is
If 0.2 gram of an organic compound containing carbon,hydrogen and oxygen on combustion ,yielded 0.147 gram carbon dioxide and 0.12 gram water.What will be the content of oxygen in the substance ?
If a sample of an organic substance is heated strongly with soda-lime in a test tube, then ammonia is evolved. It indicates the presence of
Oxidation number of Mn in K₂MnO₄ and MnSO₄ are respectively
Which of the following has highest osmotic pressure ?
NaCl is an electrolyte which dissociates to give ions.
NaCl → Na+ + Cl−
∴ concentration of ions in the solution = 2 M. Whereas glucose, sucrose and urea are non-electrolytes. Thus, NaCl has maximum concentration and highest osmotic pressure.
In an experiment, 1 g of a non-volatile solute was dissolved in 100 g of acetone (mol.weight=58) at K. The vapour pressure of the solution was found to be 192.5 mm of Hg. The molecular weight of the solute is (vapour pressure of acetone = 195 mm of Hg)
Which of the following is most effective in causing the coagulation of ferric hydroxide sol?
Which one of the following shows highest magnetic moment?
On heating sodium metal in dry ammonia, the compound formed is
Thus in this reaction, sodium amide (NaNH2) is formed.
Formation of interstitial compound makes the transition metal
Algae that are present in water with temperature upto 100°C are known
Frog's kidney is
In meiosis, centromere divides during
Abscission layer is made of
In synapsis, two homologous chromosomes are connected at
In which cell types of Funaria, reduction division takes place
Which among the following was named after the Italian Botanist F.Ricci?
Average thickness of unit membrane is
Edward's syndrome characterised by mental deficiency is caused by trisomy of chromosome
Amino acids are produced from
Glyoxylate cycle plays an important role in the conversion of
Which of these factors will increase the RBC or RCC?
A male human is heterozygous for autosomal for haemophilic gene h. What proportion of sperms will carry abh.
In the resting person, saturation of haemoglobin as blood leaves the tissue capillaries is approximately
Which of the following causes abortion in ladies ?
Select the statement about red blood cells that is incorrect.
Tubectomy, a method of population control, is performed on :
Progesterone is generally present in contraceptive pills. Its function is to :
Which gastrointestinal layer is characterized by having tough, fibrous connective tissue?
The percentage of blood cells in whole blood is called _____.
The majority of the absorption of digested nutrients occurs in the:
Concept of life forms was given by
Weathering of rocks makes phosphorus available to first
Enzyme activity is facilitated through
Brain sand is found in
Endoenzymes generally act at
Algal zone cavities are situated in apogeotropic roots of Cycas in
Gymnosperms lack fruit because they lack-
Which is direct ancestor of Homo sapiens?
A dihybrid for qualitative trait ia crossed with homozygous recessive individual of its type, the phenotypic ratio is :
Total population of 800 individuals which formed F₂ population (9:3:3:1) of a cross between yellow round and green wrinkled. Find the number of plants with yellow and wrinkled seeds
A heterozygous indivdual is crossed with a homozygous dominant parent, it is a
Lysis of foreign cells is mediated through
Interferon suppresses the pathogenicity of
Immunoglobin found in serum is
Rheoreceptors are receptors for
Which one possesses radial symmetry
Blood group is due to
Plants that act as indicators of SO pollution in the atmosphere are
Star fish belongs to
Little leaf disease of Brinjal is caused by an
Mycoplasma causes a disease
Which is the role of molybdenum
Ester linkages occur in
Oxygen carring respiratory pigment of cockroach is
In cockroach, oxygen is transported to the tissues of the body by
Microelements function as
In earthworm setae occur in all segments except
In Pheretima septa do not occur in
An oxidative phosphorylation in plant cell, occurs in
Nodulus type of adventitious roots are characteristic of
Identify the plant in which the roots hang in air and have spongy tissue
A function of enzymes is to
Which one pair of plants out of the following derive nitrogen from insects?
Maximum quantity of humus occurs in
Identify the perennial plant
An important example of serendipity is
The fish Lepidosiren belongs to the country :
Modified antibiotics are manufactured by the technique of
Apart from streptococcus lactus the enzyme rennin (prepared from calve\'s stomach) is added in the manufacture of
Humus is good for plant growth because
Which of the following is a green manure?
A concentric vascular bundle is one in which of the following
Plant medium used widely in preparation of culture medium is got from
The term ' humulin ' is used for
The bubbles arise in dough due to
Genetically engineered crop which has been recently introduced in India is
Lignified cell wall occurs in
Bladderworm stage of Taenia solium is
In Minamata Bay of Japan, the animals which remained free from Minamata disease, are
What is the intensity of sound in normal conversation?
Competition is severe in a population that has a distribution
The aggregate of processes that determine the size and composition of any population is known as
Atmosphere of big/metropolitan cities is polluted most by
Plant part having two generations, one within the other is
When gynoecium is present in the topmost position of thalamus, the flower is known as
Amino acids are formed during digestion of
Milky water of green coconuts is
When testosterone levels in a man’s bloodstream decrease
The character found only in halophytes is
Cucurbitaceae has plant yielding a vegetable fruits what is the position of this family in Bentham and Hooker classification-
Increased secretion of FSH (follicle-stimulating hormone) will result in increased production of
Which hormone triggers the release of the egg from the developing follicle?
Antrum is filled with fluid and is found in
Inferior ovary is in one of the follwing-
Which hormone is released when the salt concentration in the blood increases?
Movement of fluids from the glomerulus’s to Bowman’s capsule is due to
The sequence of structures that urea passes through in the nephron is
Which of the following metabolic wastes is excreted by the skin?