The coefficient of induction of a choke coil is 0.1 H and resistance is 12Ω. If it is connected to an alternating current source of frequency 60 Hz, then power factor will be
Photoelectric current can be increased by using
If there are n capacitors in parallel connected to V volt source, then energy stored is equal to
Since the capacitors are connected in parallel to the battery, potential difference across each capacitor will be V. Hence, the total energy stored will be n times the energy stored in a single capacitor.
Choke used to limit high frequency A.C. has
A tachometer is a device to measure
The length of given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be
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
A certain piece of silver of given mass is to be made like a wire. Which of the following combinations of length (L) and the area of cross-section (A) will lead to the smallest resistance
Infrared radiation is detected by
Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is
At what height from the ground will the value of 'g' be the same as that in 10 km deep mine below the surface of earth
If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor
How many times is escape velocity (ν₀)of orbital velocity (ν₀) for a satellite revolving near earth ?
Calculate the capacitance C of the capacitor if C0 is the capacitance without dielectric
A cylindrical rod is having temperature T₁ and T₂ at its ends. The rate of heat flow is Q J-s-1. If all the linear dimensions are doubled, keeping temperature constant, then new rate of heat flow will be
In the Young's double-slit experiment, a mica slip of thickness t and refractive index μ is introduced in the ray from first source S₁. By how much distance fringes pattern will be displaced.
A voltmeter of resistance 20000 Ω reads 5 volt. To make it read 20 volt, the extra resistance required is
The root mean square velocity of the molecules of different ideal gases maintained at the same temperature is
A circular coil of radius R carries an electric current. The magentic field due the coil at a point on the axis of the coil located at a distance r from centre of the coil, such that r >> R varies
H⁺, He⁺ and O⁻⁻ all having the same kinetic energy pass through a region in which there is a uniform magentic field perpendicular to their velocity. The masses of H⁺, He⁺ and O⁻⁻ are 1 amu, 4 amu and 16 amu respectively. Then
A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength √3 T is applied to the needle in a perpendicular direction, then the angle through which the needle will deflect, is
A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40o. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30o with the magnetic meridian. In this position, the needle will dip by an angle
Two similar bar magnets of the same mass and dimensions freely suspended by threads in a horizontal plane are found to make 12 oscillations and 15 oscillations per minute. Then their magnetic moments are in the ratio of
If a liquid does not wet the glass, then its angle of contact is
In old age, arteries carrying blood in the human body become norrow, resulting in an increase in the blood pressure. This follows from
Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is
Which of the following has largest moment of inertia
The velocity of a body depends on time according to the equation ν = 20 + 0.1 t2. The body is undergoing
A weightless ladder 20 ft long rests against a frictionless wall at an angle of 60o from the horizontal. A 150 pound man is 4 ft from the top of the ladder. A horizontal force is needed to prevent it form slipping. Choose the correct magnitude from the following
Number of particles emitted in the reaction is
Nuclear fusion occur in
The minimum magnifying power of a telescope is M. If the focal length of its eye-lens is halved, the magnifying power will become
The potential energy of a particle executing simple harmonic motion at a distance y from its equilibrium position is
A photon of energy 3.4 eV is incident on a metal having work function 2 eV. The maximum K.E. of photo-electrons is equal to
The work function of oxide coated tungsten emitter will be
To print a photograph from a negative, the time of exposure to light from a lamp placed 0.5 m is 2.5 s. If the lamp is placed 1 m away, then time of exposure will be
A ball is projected with kinetic energy E at an angle of 450 to the horizontal. At the highest point during its flight, its kinetic energy will be
Which of the following spectrum have all the frequencies from high to low frequency range ?
A ray incident at 15o on one refracting surface of a prism of angle 60o suffers a deviation of 55o What is the angle of emergence ?
An endoscope is employed by a physician to view the internal parts of the body organ. It is based on the principle of total
A spherical solid ball of 1 kg mass and radius 3 cm is rotating about an axis passing through its centre with an angular velocity of 50 radian/s. The kinetic energy of rotation is
What should be the displacement of a simple pendulum whose amplitude is 'A' at which potential energy is 1/4th of the total energy
A mass suspended from a spring executes simple harmonic motion. When the body is at half the amplitude from the mean position, the ratio of the kinetic energy and the potential energy of the body will be :
The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 KΩ. The peak value of the collector a.c. current for an ac input voltage of 0.01 V peak is
Three semi-conductors are arranged in the increasing order of their energy gap as follows. The correct arrangement is
The equation of a progressive wave is y = 0.002 sin 2 π (2 t − 0.01 x) , its wave length λ is
Oil spreads over the surface of water where as water does not spread over the surface of the oil, due to
A heater coil is cut into two parts of equal length and one of them is used in the heater. The ratio of the heat produced by this half coil to that by the original coil is
As per joule's law of heating, H = (I2) RT
Since the coil is cut in half, its length halves and so does the resistance (Resistance varies directly with length)
After the coil is cut, H" = (I2) ( R/2 ) T
A silver and zinc voltameter are connected in series and a current i is passed through them for a time t liberating W gm of zinc. The weight of silver deposited is nearly
The expression for thermo e.m.f. in a thermocouple is given by the relation E=40θ - θ2/20, where θ is the temperature difference of two junctions. For this, the neutral temperature will be
In a cyclic process, work done by the system is
The variation of density of a solid with temperature is given by the formula
Which of the following pairs is wrong
Work done by 0.1 mole of a gas at 27oC to double its volume at constant pressure is
(R = 2 cal mol1K1)
Wavelength of ray of light is 0.00006 m. It is equal to
The light from a sodium vapour lamp passes through a single narrow slit and then through two close, parallel narrow slits. The single slit lies on the perpendicular bisector of the line joining the two close, parallel slits. An observer looking towards the lamp through the double slit will see
Wave optics is based on wave theory of light put forward by Huygen and modified later by
Suppose that the speed of sound in air at a given temperature is 400 m/sec. An engine blows a whistle at 1200 Hz frequency. If is approaching an observer at the speed of 100 m/sec. What is the apparent frequency as heard by the observer
The displacement x (in metres) of a particle performing simple harmonic motion is related to time t (in seconds) as x = 0.05 cos (4 π t + π/4) The frequency of the motion will be
A body of mass 100 g is rotating in a circular path of radius r with constant speed. The work done in one complete revolution is
Which one of the following compounds gives acetylene upon reaction with water?
The reaction of t-Butylbromide with sodium methoxide produces mainly
In its reaction with silver nitrate acetylene shows
Which is not dissolved in dil. HCl?
The energy of a photon is 3 x 10-12 ergs . What is its wavelength in nm?
(h = 6.62 x 10-27 ergs . sec ; C = 3 x 1010 cm.s-1)
The total number of electrons present in all the s-orbitals, all the p-orbitals and all the d-orbitals of cesium ion are respedtively
which of the following hybridisation occurs in the formation of methane molecule?
Which of the following is a magic number?
Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because
For a system in equilibrium ,∆G = 0 under conditions of constant
The number of nodal planes present in σs* antibonding orbitals is
When an inert gas is added to the system, 2 HI ⇌ H2 + I2 , the degree of dissociation of HI will be
There will be no change in equilibrium concentration of H2, I2 and HI, which occur in the equilibrium law equation. So no change in the degree of ionization of HI (No change in partial pressures of reactants and products).
A first reaction is half completed in 45 minutes. How long will it take to complete the reaction by 99.9%?
Which one of the following is an example of exothermic reaction?
Which of the following gas molecule has the maximum specific heat at constant pressure?
Substances which bring body temperature down are known as
How many sigma and pi bonds are present in toluene?
The IUPAC name of K₃[Ir(C₂O₄)₃] is
Which one of the following represents the correct order of electronegativity
The electronegativity values for the representative elements increase along a period from left to right and decrease down a group. This is because, as we move along the period from left to right nuclear charge increases and atomic radius decreases whereas when we move down the group, the atomic radius as well as screening effect increases. Thus, the order of electronegativity of N, O and P is
O > N > P
Which of the following aqueous solutions will conduct an electric current quite well?
The least stable oxide at room temperature is
At STP, a container has 1 mole of Ar, 2 moles of CO2,3 moles of O2 and 4 moles of N2. Without changing the total pressure if one mole of O2 is removed, the partial pressure of O2
Total moles of gases = 10 Let the pressure be P
∴ Partial pressure of oxygen (po2) = 3P/10
No. of mol of O2 in the mixture after removal of 1 mol of O2 = 2
Total moles = 9
Partial pressure of oxygen after removal of O2 (p'o2) = 2P/9
Decrease in partial pressure of O2
= 3P/10 - 2P/9 = 0.078 P
% decrease = 0.078 P x 100/3P = 26%
In the equation of state of an ideal gas PV = nRT, the value of universal gas constant would depend only on
Sodium metal cannot be stored under
While phosphorus forms PCl5, nitrogen does not form NCl5 because
Glass reacts with HF to produce
Which among CH₄,SiH₄,GeH₄,and SnH₄ is most volatile?
Hybridization in SO₃ is
What is formed when powdered colemanite boils with sodium carbonate solution?
Plaster of Paris is a hydrate of
Ammonium ion is
Which has the highest molar heat of vapourization?
In which of the following acid-base titration, pH is greater at eqivalence point?
Given that Ka for acetic acid as 1.8 x10⁻5 and Kb of NH₄OH as 1.8 x10⁻5 at 25oC,predict the nature of aqueous solution of ammonium acetate
Speed of decomposition of H₂O₂ is reduced by
A symmetrical molecule has 2 chiral carbon atoms. The no. of isomers is
A radioactive istope having a half-life of 3 days was reseived after 12 days. It was found that there was 3 g of the isotope in the container. The initial weight of the isotope when placed was
Glacial acetic acid is obtained by
Which of the following is correct?
A human body required 0.01 μC activity of radioactive substance for 24 hrs. Half life of radioactive substance is 6 hours. Then injection of maximum activity of radioactive substance (in μC) can be injected is
SN1 reaction of alkyl halides leads to
Which gives more stable product ?
Which of the following compounds can react with the Lewis base Cl- in a Lewis acid-base reaction?
The boiling point of glycerol is more than propanal because of:
An organic compound A reacts with methyl magnesium iodide to form an addition product which on hydrolysis forms the compound B. Compound B gives blue colour salt in Victor Meyer's test. The compounds A and B are respectively.
Which of the following forms with an excess of CN⁻(cyanide ions) a complex having co-ordination number two
Which of the following reactants will react with phenol to give salicylaldehyde after hydrolysis?
Equivalent mass of crystalline oxalic acid is
Example of addition polymer is
Which of these substances is a good reducing agent?
A 2.5 mol hydrazine N₂H₄ loses 25 mole of electrons is being converted to a new compound X. Assuming that all of the nitrogen appears in the new compound, what is the oxidation state of nitrogen in compound X?
The phenomenon of X-ray diffraction was first studied by
Distillation is used to separate liquids which differ in their boiling point by
The essential and sufficient condition for enantiomers to exist is:
The compounds containing an asymmetric carbon in their molecules are dissymmetric and hence show enantiomerism
But there are examples where in spite of the presence of asymmetric carbons the compound does not show enantiomerism because its molecules are non-dissymmetric. For example, meso-tartaric acid
There are compounds which do not contain any asymmetric carbon atom but still show enantiomerism and optical activity because their molecules are dissymmetric. For example, substituted allenes and substituted bi-phenyls
So the essential and sufficient condition for enantiomers to exist is dissymetry in the molecule
The oxidation state of Mo in
Which of the following is not a colloid?
The equivalent weight of an element is 4. Its chloride has a vapour density of 60. The valency of the element is
Of the following, which has the highest magnetic moment ?
The freezing point of 0.05 molal solution of a non-electrolyte in water is
Find the antonym of DERISIVE
Find the Antonym of RESERVED
Choose the one which can be substituted for the given words/sentences :
An expression of mild disapproval
Spot the error.
Fill in the blank with appropriate word.
The Hubble Space Telescope will search for planets around other stars, a key to the..........for extra terrestrial life, and examine interstellar dust gases out of which stars are born.
Fill in the blank with appropriate word.
Being guilty, my daughter was afraid to...........me in the eye.
Find the synonym of PRECISELY
Find the Syonym of AMBITION
Out of the given alternatives, choose the one which can be substituted for the given capitalised word.
I am leaving India FOR GOOD.
Out of the given alternatives, choose the one which can be substituted for the given capitalised word.
The old beggar RAN AMUCK and began to throw stones at the passerby.
Excretion of nitrogenous wastes in Hydra takes place through:
Larva of 'Culex' floats on surface of water with its head
The function of an artery is to
The buffy coat evidenced by separating blood cells is comprised of _____.
All of the following conditions impair coagulation except:
Osteomalacia is a disease caused by the deficiency of
Soft drinks such as colas contains the significant quantity of
An example of monocot fibre yielding plant
Indian rubber tree(Ficus elastica) belongs to
Fibre of great commercial importance derived from epidermis is
The green plants constitute
An ammonifying bacterium is
Which amongst the following secrete androgens ?
Lead arsenate is a
In a pond ecosystem, benthos means
In Cycas,male gametes are produced in the pollen tube by the division of which of the following cells ?
Steroid hormones easily pass through the plasma membrane by simple diffusion because they
F₂ ratio in chicken came out to be 9 rose comb blacks, 1 single comb white, 3 rose comb whites and 3 single comb blacks. Which are the recessives?
Chargaff's rules are applicable to
Sickle-cell anaemia is a genetic disorder. The cause of the disease is due to :
(i)The substitution of glutamic acid in place of aspartic acid.
(ii)The substitution of proline in place of methionine.
(iii) Substitution of valine in place of glutamic acid.
Select the correct answer using the codes given below :
A colour blind girl is rare and can be born when
The part of eye acting as a diaphragm of camera is
Loss of forests, urbanization, increasing pollution are all due to
Mesozoic era was dominated by
Loss of forests, urbanisation and increasing pollution are due to
The bone attached to the inner surface of the eardrum is called
Which of these would not be found in lymph fluid?
A wood boring mollusc/Shipworm is
Which of the following is NOT a lymphoid organ?
Soil salinity is measured by
Most widely accepted theory of carbohydrate translocation is
A group of animals having marsupium:
Little leaf/leaf rosetting is deficiency symptom of
Abscission layer is formed when the concentration of
Which one of the following substances plays an important role in biochemical defence of host plants?
All the cytokinins are
Nitrogen fixation occurs in
Six kingdom classification was suggested by
In angiosperms, chlorophyll formation requires
Polluted waters do not contain
The noise created at the launching of space rocket measures around
Vinegar is prepared from alcohol with the help of
Regeneration was first discovered in
An ovule which becomes curved, so that nucellus and embryo sac lie at right angles to the funicle, is