Work of electric motor is
The wavelength of X - rays is of the order of
The energy of an X - ray photon of wavelength 1.65Å is (h = 6..6 x 10-34 J -s; c = 3 x 108 ms-1; 1ev = 1.6 x 10-19 J
A proton and an α - particle enter into a region of uniform electric field. The ratio of the force on proton to that on α - particle is
If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a
Three identical cells each of e.m.f. 2 V and unknown internal resistances are connected in parallel. This combination is connected to a 5 Ω resistor. If the terminal voltage across the cell is 1.5 V, then internal resistance of each cell is
If the equation for the displacement of a particle moving on a circular path is given by (θ) = 2t3 + 0.5, where θ is in radians and t in seconds, then the angular velocity of the particle after 2 sec from its start is
The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 4000Å light
The energy of a photon of wavelength λ is given
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
A metal plate gets heated, when cathode rays against it, due to
An inductance L having a resistance R is connected to an alternating source of angular frequency ω. The quality factor (Q) of the inductance is L/R
The difference between soft and hard X-rays is
Which scientist experimentally proved the existance of electromagnetic waves?
If 4 x 1020 eV of energy is required to move a charge of 0 . 25 coluomb between two points, the p.d between them is
If the charge on a body is increased by 2C, the energy stored in it increased by 21%.The original charge on the body in coulombs is
The angular velocity of rotation of star at which the matter strat to escape from its equator will be
The radiant energy from the sun incident normally at the surface of earth is 20 kcal/m2 min. What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one
Consider a gas with density ρ and c̅ as the root mean square velocity of its molecules contained in a volume. If the system moves as whole with velocity υ, then the pressure exerted by the gas is
A shell of mass m moving with velocity ν suddenly breaks into 2 pieces. The part having mass m/4 remains stationary. The velocity of the other part will be
A current carrying straight wire is kept along the axis of a circular loop carrying a current. The straight wire
A bar magnet used in vibration magnetometer is heated so as to reduce its magnetic moment by 36%. The time period of the magnet [Neglecting the changes in the dimensions of the magnet ]
For protecting sensitive equipment from external magnetic field, it should be
The shape of a liquid drop becomes spherical due to its
In carbon cycle of fusion
A radioactive isotope has a half-life of 2 years. How long will it take the activity to reduce to 3% of its original value?
A cube is subjected to a uniform volumatric compression. If side of cube decreases by 1%, then its bulk strain is
Period of oscillation of mass attached to a spring and performing SHM is T. The spring is now cut into four equal pieces and the same mass attached to one piece. Now the period of its simple harmonic oscillation is
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
The equivalent focal length of a Huygen's eye piece
Two waves are said to be coherent if they have
A wheel has a speed of 1200 rpm and is made to slow down at a rate of 4 rad/s2. The number of revolutions it makes before coming to rest 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
In a semiconductor the separation between conduction band and valence band is of the order of
The minimum phase difference between the two simple harmonic oscillations
y₁=(1/2)sinωt+(√3/2)cosωt and y₂=sinωt+cosωt is
Bonding in a germanium crystal (semiconductor) is
To deposit one litre of hydrogen at 22.4 atmosphere from acidulated water, the quanity of electricity that must pass through is
During an adiabatic process, if the pressure of an ideal gas is proportional to the cube of its temperature, the ratio (Cp,Cv are specific heats at constant pressure and volume)
A cylinder of radius r and of thermal conductivity K1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r made of a material of thermal conductivity K2. The effective thermal conductivity of the system is
Unit of impulse is
Two waves of same frequency and intensity superimpose with each other in opposite phases, then after superposition the
A vibrating tuning fork generates a wave given by y = 0.1 sinπ (0.1x - 2t), where x and y are in metre and t is in seconds. The distance travelled by the wave while the fork completes 30 vibrations is
Comparing with y = A sin(ωt - kx), we find
k = 0.1π = 2π/λ
⇒ λ = 20m
Here, λ is the distance travelled in one vibration
Hence, distance travelled in 30 vibrations = 600m
A particle of mass m at rest is acted upon by a force P for a time t. Its kinetic energy after an interval t is
A ball is projected vertically down with an initial velocity from a height of 20 m onto a horizontal floor. During the impact it loses 50% of its energy and rebounds to the same height. The initial velocity of its projection is
A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is
A compound X undergoes reduction with LiAlH₄ to yield Y. When vapours of Y are passed over freshly reduced copper at 300°C. X is formed. What is Y?
Which of the following are iso-electronic and iso-structural?
The reagent with which both acetaldehyde and acetone react easily is
The mass of the proton is 1840 times that of electron. If it is accelerated by applying a potential difference of 1 kV, the kinetic energy of proton is
The four bonds in methane are directed in space at an angle of
Elimination of bromine from 2- bromobutane results in the formation of
The α-amino acids, usually, exist in the form of zwitter ions. It means they consist of
The acid showing salt like character in aqueous solutions is
Which of the following molecules has zero dipole moment?
In which of the following, the bond angle between the two atoms is minimum?
Which of the following conditions regarding the chemical process ensure its spontaneity at all temperatures ?
Na2O, Al2O3, MgO and SiO2 have heats of formation equal to -416, -911, -1676 and -602 KJ-mol-1 respectively. which is most stable?
Energy is released when a compound with a negative heat of formation is formed from its elements. The same amount of energy is required to decompose that compound into elements. The higher is the value of the negative heat of formation, greater is the amount of energy required for the decomposition of the compound, that is, the more stable the compound is. Thus, carbon dioxide with ΔH° f = -393.5 kJ mole-1 is more stable than water (liquid) the ΔH° f for which is = 285.8 kJ mole-1.
Thus Correct Answer is MgO
Which of the following is true about catalyst?
For the reaction
AB2 (g) ⇌ AB (g) + B (g)
If α is negligiable w.r.t. 1 then degree of dissociation (α) of AB2 is proportional to
Which of the following is an endothermic reaction?
A reaction in which heat is absorbed when reactants are converted into products is called endothermic reaction
During the reaction heat is absorbed, by the system from the surroundings and ΔH is + ve
So the reaction is endothermic reaction
Identify the correct statement regarding entropy
In liquid propellants the fuel is
The prefixes sys and anti are used to denote
The hypothetical complex Diaquatriammine-chloro-cobalt(III) chloride can be represented as
When one Faraday current is passed which of the following would deposit one gram atomic weight of the metal?
The shape of [Cu(NH₃)₄]2⁺ is
Faraday's laws of electrolysis are related to the
Which of the following flux is used to remove acidic impurities in metallurgical processes?
Anoxia is caused by
Heating an ore in the absence of air below its melting point is called
Use of hot air balloons in sports and metereological observations is an application of
Percentage of lead in lead pencil is
The V.D. of a gas is 11.2. The volume occupied by 11.2 gm of this gas at N.T.P. is
Which of the following sets gives the correct arrangement of the compounds involved based on their bond strengths?
The hydrolysis of a salt of strong acid and weak base is called
Which of the following compound is tribasic acid?
Which one of the following methods is neither meant for synthesis nor for separation of amines ?
Arrange these compounds in order of increasing SN1 reaction rate :
Major and minor product of E2 reaction of
which of the following is a synthetic polymer?
In Lassaigne's test for nitrogen, the blue colour is due to the formation of
Steam distillation is used for the purification of
Which of the following is not a redox reaction?
For a 1 molar solution of NaCl in water at 25°C and 1 atm. pressure
Volume of 0.1 M K₂Cr₂O₇ required to oxidise 35 ml of 0.5 M FeSO₄ solution is
The valence shell of transition elements consist of
The volume of a concentrated H2SO4, mixed with 0.5 N KOH to prepare 150 ml of 0.2 N KOH solution is
Reaction of zinc with cold and very dil. HNO₃ gives
A would have been correct if the reaction that was asked was with hot and conc. HNO3.
Hence C is correct.
In homogeneous catalytic reactions, the rate of reaction
Conjugation occurs in
The oldest layer of secondary phloem in a dicot stem is located just
A condition of not having exact multiple of haploid set is
Who proposed the concept of unit membrane for tripartite structure of lipoproteins?
Under electron microscope, chromatin fibres appear like beads in a string. The beads are
Which is the last molecule to appear in a clotting reaction?
Chromosome is connected with
Which of the following does not belong with the others?
HIV is classified as a retrovirus because its genetic information is carried in :
High increase in human population is due to :
The percentage of blood cells in whole blood is called _____.
Oral contraceptives are used by females to check :
Most of the contraceptive pills contain
Annual plants lacking perennating buds belong to
Where does complete digestion of protein take place?
An organ where a hormone shows its effect is called
Which of the following pairs is a sedimentary type of biogeochemical cycle?
pH of gastric juice is
The female cone of Pinus is a modification of -
In Pinus male and female reproductive structures occur -
Which of the following statements is correct?
Enzyme inhibition caused by a product of enzyme catalysed reaction is
A nonprotein organic part attached firmly by covalent linkage to apoenzyme is
The term 'gene' was introduced by :
Vaccines produced through geneticengneering are safe as
Short lived immunity acquird by foetus/infant from mother through placenta/milk is
Sensory neurons of retina of eye are
Which of the following variations are temporary and have nothing to do with the last or next generation?
Edward Jenner discovered
Presence of extra finger or toe is known as
Who discovered vaccine against small pox?
All chordates possess
The most well studied bacterial-plant relationship is that of
One of the following spores suggest the imperfect stage of the fungus
Tapeworm does not possess digestive system as it
Genetic recombination through transduction was first discovered in bacterium
Photochemical reactions in chloroplasts are directly involved in
The number of ovarioles in each ovary of cockroach is
A saturated fatty acid is
Function/s of Malpighian tubules in cockroach is/are
Which one does not fix nitrogen?
Deficiency of Molybdenum causes
Modification of petiole into leaf like structure called
In earthworm setae occur in all segments except
The direction of the conduction of food through phloem is
At maturity, which of the following is non-nucleated ?
In a flowering plant, archesporium gives rise to
The female genital pore of Pheretima posthuma located upon the segment
Which organelle would be required in large numbers by a cell whose membrane is often depolarized?
The genes for antibiotic resistance are found in
Which of the following organic acid is the main source of vinegar?
Individuals of a species which occur in a particular area constitute
Edaphology is connected with
Which of the following is a true fish ?
Triticale is the hybrid between wheat and
If by radiation all nitrogenase enzymes are inactivated, then there will be no
Blood spectrum antibiotic is effective
Which one is not a component of organic farming
Sporeine was developed in
Genetic transformation by applying high electric potential for a few microseconds to change the porosity of protoplast to DNA is called
Water pollution is caused due to
Which of the following is biodegradable pollutant?
Which of the following are monogenic parasites
Separate xylem and phloem bundles are known as
Intensity of sound in normal conversation is
Bordered pits are found in
Which is the method followed for virus elimination in plants
Two different types of plant species living together at a place represent
Which one is true?
A flower characterised by monadelphous tubular stamen belongs to
A basic amino acid is
When the pollen tube enter the embryo sac through the base of the ovule or even piercing the integument, the fertilization is called
Bulbovestibular gland is found in female rabbit. It is also known as
Testosterone in the adult male is produced by the