There is a 5Ω resistance in an A.C, circuit. Inductance of 0.1H is connected with it in series. If equation of A.C. e.m.f. is 5sin50t then the phase difference between current and e.m.f. is
According toMoseley's law, the frequency of a spectral line in X - ray spectrum varies as
The force on an electron moving with a velocity 'v' in a field of magnetic induction 'B' acting perpendicular to it is
The photo electric threshold wave length for potassium (work function being 2eV) is
A stone of mass 1 kg tied to a light inextensible string of length L = 10/3 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the string is 4 and if g is taken to be 10 m/sec2, the speed of the stone at the highest point of the circle is
In a circuit, n identical bulbs, each of power 'P' are joined in series across a power supply. The total power drawn by the bulbs is
The equivalent resistance between the terminals P and Q of infinite network as shown in the figure is
Mixed He⁺ and o2⁺ ions (mass of He⁺ = 4 amu and that of o2⁺ = 16 amu) beam passes a region of constant perpendicualr magnetic field. If kinetic energy of all the ions is same then
Which of the following phenomena is observed when black discharge occurs in a discharge tube ?
Light of two different frequencies whose photons have energies leV and 2.5eV respectively, successively illuminates a metal of work function 0.5eV. The ratio of maximum kinetic energy of the emitted electron will be
Photoelectric effect proves the
The current passing through a coil of 5 H is decreasing at the rate of 2 A/s. The emf developed in the coil is
An electromagnetic wave passing through vacuum is described by the equations: E = E₀ sin (kx-ωt) and B = B₀ sin (Kx-ωt). Then
A neutral sphere of radius r and density ρ is intended to be suspended with an electric field E existing on earth's surface directed vertically up. What fraction of the electrons should be removed from the sphere? Given that, the atomic number and atomic mass of material of the sphere are Z and A respectively. Avogadro's number is NA. Assume that the sphere is able to hold the necessary charge without any leakage.
The idea of displacement current was introduced by
The two point charges of 2C are -6C attract each other with a force of 12N. A -ve charge of 2C is added to each of the above charges. Now the force between them is
If the rotational speed of earth is increased, then weight of a body at the equator
Which of the following is the example of ideal black body
When the pressure on 1200 ml of a gas is increased from 70 cm to 120 cm of mercury at constant temperature, then new volume of the gas will be
A body of mass 10 kg lies on a rough horizontal surface. When a horizontal force of F newtons acts on it, it gets an acceleration of 5 m−s⁻2. And when the horizontal force is doubled, it gets an acceleration of 18 m−s⁻2. The coefficient of friction between the body and the horizontal surface is (Take g = 10 m−s⁻2)
The magnetic force acting on a charged particle of charge − 2μC in a magnetic field of 2T acting in y direction, when the particle velocity is
A bar magnet of pole strength 2 A-m is kept in a magnetic field of induction 4 x 10−5 wbm−2 such that the axis of the magnet makes an angle 30° with the direction of the field. The couple acting on the magnet is found to be 80 x 10−7 N - m . Then the distance between the poles of the magnet is
At a certain place, the horizontal component of the earth's magnetic field is B₀, and the angle of dip is 60°. The intensity of earth's magnetic field at that place will be
The rate of flow of water in a capillary tube of length 'l' and radius 'r' is 'V'. The rate of flow in another capillary tube of length '2l' and radius '2r' for same pressure difference would be
The breaking stress of a wire depends upon
Which of the following is more effective in inducing nuclear fission
A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 min, the rate is 1250 disintegrations per min. Then, the decay constant (per minute) is
Nuclear fusion occur in
A coin is placed on a horizontal platform, which undergoes vertical simple harmonic motion of angular frequency ω. The amplitude of oscillations is gradually increased. The coin will have contact with the platform for the first time. (i) at the higher position of the platform (ii) at the mean position of the patform (iii) for an amplitude of g/ω2 (iv) for an amplitude of √2/ω
An equiconvex lens of glass of focal length 0.1 m is cut along a plane ⊥ er to principal axis into two equal parts. The ratio of focal length of new lenses formed is
A clock is held facing a plane mirror. From the point of view of a person looking into the mirror, does the image of the second hand rotate
A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum
A hollow cylinder A and a solid cylinder B of the same mass and outer diameter are released from a point on an inclined plane. They roll down without slippling. Which reaches the bottom first?
The length of the second pendulum on the surface of earth is 1 m. The length of second's pendulum on the surface of moon, where g is 1/6th value of g on the surface of earth, is
The potential barrier, in the depletion of layer, is due to
In a P-type semiconductor
The negative Zn pole of a Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 min. If the electrochemical equivalents of Zn and Cu are 32.5 and 31.5 respectively, then increase in the mass of positive Cu pole in this time is
22 gram of CO₂ at 27°C is mixed with 16 gram of oxygen at 37°C. The temp. of the mixture is
A Carnot engine has an efficiency of 25%. If energy is fed into the engine at the rate of 1 kW, then the output of the engine is
A highly rigid cubical block A of small mass M and side L is fixed rigidly onto another cubical block B of the same dimensions and of low modulus of rigidity η such that the lower face of A completely covers the upper face of B. The surface lower face of B is rigidity held on a horizontal surface A small force F is applied perpendicular to one of the side faces of A. After the force is withdrawn block A executes small oscillations. The time period of which is given by
Doppler effect is applicable for
The equation of a transverse wave is given by y = 5 sin (12 t-0.02 x), where y and x are in centemeters and time (t)is in seconds. What is the frequency of the wave?
A body of mass 5 kg explodes at rest into three fragments with masses in the ratio 1 : 1 : 3. The fragments with equal masses fly in mutually perpendicular directions with speeds of 21 m/s. The velocity of the heaviest fragment will be
A spring of force costant 10 N/m has an initial stretch 0.20 m. In changing the stretch to 0.25 m, the increase in potential energy is about
Two identical cylindrical vessels with their bases at same level each contains a liquid of density ρ. The height of the liquid in one vessel is h1 and that in the other vessel is h1. The area of either base is A. The work done by gravity in equalizing the levels when the two vessels are connected, is
The work done by gravity equals the change in the potential energy of the system after the vessels are interconnected. The liquid in each vessel as equivalent to a point mass kept at their respective centres of mass. The mass of the liquid is given by (Ahρ) and that the PE of a mass at a height h in earth's gravity is mgh, we have
Total PE at start =
After the vessels are connected, the height of liquid in each vessel is
Hence PE after connection
This must be equal to the work done 'by' gravity on the liquid.
Thus the work done 'by' gravity is
Reaction of tert-butyl bromide with sodium methoxide produces
In which of the following reactions, both oxidised and reduced forms of the same compound are obtained?
Which one of the following atomic orbitals is not directed along the axis?
According to Bohr's theory, the energy required for the transition of H atom from n = 6 to n = 8 state is
The compound with carbon uses only its sp3 hybrid orbitals for bond formation is
A σ - bond is
Which of the following is the strongest acid?
Which of the following pair of molecules will have permanent dipole moments for both members?
The boiling point of para nitrophenol is greater than that of ortho nitrophenol, because
C(s) + O₂(g) → CO₂(g); ∆H = - 395 KJ
S(s) + O₂(g) → SO₂(g); ∆H = -295 KJ
CS₂(l) + 3O₂(g) → CO₂(g) + 2SO₂(g); ∆H + -1110 KJ
The heat of formation of CS₂ is
How much energy is released when 6 mol of octane is burnt in air ? Given that ∆fH° for CO₂(g),H₂O(g) and C₈H₁₈(l) respectively are -490,-240 and + 160 KJ mol⁻1.
In photochemical reactions, the temperature
The law of mass action was encunciated by __
When 10gram of methane is completely burnt in oxygen, the heat evolved is 560kJ. What is the heat of combustion (in kJ/mole) of methane?
Hess's law deals with
An ester used as medicine is
The isomerism exhibited by alkyl cyanide and alkyl isocyanide is
Which of the following is not an organometallic compound?
Nickel (Z = 28) combines with a uninegative monodentate ligand X − to form a paramagnetic complex [NiX4]2−. The number of unpaired electron(s) in the nickel and geometry of this complex ion are, respectively
Which of the following is not a strong electrolyte?
In a solution of CuSO₄ how much time will be required to precipiate 2g copper by 0.5 ampere current?
Oxidation number of S in H₂S₂O₈ is
Depletion of ozone layer causes
Galena is an ore of
The pair of amphoteric hydroxides is
Which one of the following indicates the value of the gas constant R ?
Optical glass contains a high percentage of
Equal weights of methane and hydrogen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by hydrogen is
The following acids have been arranged in the order of decreasing acid strength. Identify the correct order. ClOH(I) BrOH (II) IOH (III)
Which of the following sulphides has the lowest solubility product ?
Which of the following amines will lose its nitrogen atom as trimethylamine by repeated Hofmann elimination reactions?
OUT OF Ca2⁺,Al3⁺,Bi3⁺,Mg2⁺ and Zn2⁺ the reagents NH₄Cl and aqueous NH₃ will precipitate
Which is not the resonance structure of aniline?
Most stable free radical is
An organic compound containing C=40%, H=13.33% and N=46.67%. Its empirical formula would be
Which of the following is used in plants?
Leibig method is used for the estimation of
0.15 g of a substance dissolved in 15 g of a solvent boiled at a temp. higher by 0.216°C than that of the pure solvent. Find out the molecular weight of the substance. (Kb for solvent is 2.16°C)
From the diagram given below which compound cannot be purified by recrystallisation from water
The rate of physiorption increases with
KMnO₄ oxidises oxalic acid in acidic medium. The number of CO₂ molecules produced as per the balanced equation is
Water is a/an
Protophilic solvents: Solvents which have greater tendency to accept protons, i.e., water, alcohol, liquid ammonia, etc.
Highest (+7) oxidation state is shown by
Wrought iron, pig iron and steel differ in properties due to
Formation of sex cell was first seen in
The function of the peristome in moss is
Vascular bundle with protoxylem towards the periphery is
In which of the following groups would you place a plant which produces spores and embryos but lacks seeds and vascular tissues-
In cell division, cell plate is formed during
Experiments to demonstrate importance of nucleus in controlling growth and heredity were perfomed on
Carbohydrates are present in the plasmalemma in the form of
Spindle fibres are formed of
Cork cells have a deposition of
Cytosterility in the pollen of Maize is due to
Sickle cell anaemia is a
Cryptorchidism is a condition in which
Sunil's blood type was determined to be AB+. Which of the following is true of Sunil's blood?
A matured mammalian (RBC) is unusual because
Erythroblastosis foetalis, also known as hemolytic disease of the newborn, most often occurs in ______________ mothers carrying ______________ fetuses.
Which factor promotes the appearance of the platelet plug?
Contraceptive oral pills help in birth control by :
Submerged hydrophytes have a well developed
Which of the following is not readily absorbed in the small intestine?
Technique involving transfer of ovum of a donor female into the fallopian tube of recipient female is called :
Cholelithiasis refer to
Ecosystem consists of
NAD and NADP are similar in respect that they
Which is not a trait of enzymes ?
The most nearest prehistoric ancestro of present man may be
Cycads and Ginkgo are regarded as primitive gymnosperms because -
The winged pollen grains are the characteristic feature of -
Glucagon is secreted from which cells of islet of Langerhans ?
A person with blood group A possesses
Vaccination protects a person from disease because it
If both parents of a male child are normal, what are the chances of the child being colourblind?
An autoimmune disease is
In sickle cell anaemia, there is change in amino acid in β chain at position
Membranous labyrinth is concerned with
Short lived immunity acquird by foetus/infant from mother through placenta/milk is
Name the organism which do not derive energy directly or indirectly from sun
Which one is not a snake?
Male and female cockroaches can be distinguished externally through
Which one is a fungal disease ?
AIDS Virus has
In photosynthesis, photolysis of water helps in
Citrus canker is due to
Incomplete metamorphosis occurs in
Which of the following is a C₄-plant ?
Minerals are absorbed in the form of
Ester linkages occur in
Each ommatidium in the compound eye of insects forms a different but adjacent image and all images combine to form a single coherent picture. It is known as
Parasite plants e.g. Viscum absorb water and minerals from host by
Wood is a common name of
Testes of Earthworm occur segments
Ootheca of Earthworm is produced by
Pollinia are present in which plant family
Stem of submerged hydrophytes is soft and weak because of
Which of the following is an example of scaly, imbricate bulb?
Which gas of the atmosphere holds up ultraviolet rays
One of the following organism is rich in riboflavin
Which of the following is a true fish?
Use the following information to answer the question.
1. Sodium ions move into the axon.
2. Potassium ions move out of the axon.
3. Depolarization of the membrane occurs.
4. Repolarization of the membrane occurs.
Select the correct order of the above events to describe an Action potential.
The organism, used for alcoholic fermentation, is
Variations observed during tissue culture of some plants are known as
Pure vaccines are
Well known immune proteins are
Large number of bacteria produced from a single bacterium is called
The chemical formula of cocaine is
Melanin protects us from
The common pinworm of man, Enterobius vermicularis,is found in
Increase in the concentration of pollutants in higher trophic levels is called
Given below are assertion and reason. Point out if both true with reason being correct explanation
Assertion. Collenchyma is thick walled tissue.
Reason Collenchyma is thickened due to deposition of pectin.
Lignin occurs in
Certain chemicals and pharmaceuticals which are very difficult to synthesises by standard methods of biochemistry can now be synthesised by microbes in a culture medium. Some examples of these are
Which can counteract biotic potential?
The sum total of the populations of the same kind of organisms constitute
Air pollution effects are usually found on
Formation of an organism from a single, male gamete without fusion with egg is an example of
The germination of seeds within the fruit is termed as
Which of the following is an storing protein ?
Ornethophily refers to
Positive feedback controls the secretion of which of the following hormones?
Sporopollenin occurs in
Spermatogenesis occurs in the
Menstruation is triggered by an abrupt decline in the amount of
The part of the sperm that contains hydrolytic enzymes is the
Which of the following families belong to inferae under Gamopetalae in Bentham and Hooker's system of classification -
Antidiuretic hormone (ADH) has an effect on the