Previous Year Questions
76 questions — organised by subject with solutions and explanations.
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The major organic compound formed by the reaction of 1, 1, 1– trichloroethane with silver powder is:[Main 2014]
The equivalent conductance of NaCl at concentration C and at infinite dilution are and respectively.The correct relationship between and is given as: (where the constant B is positive)[Main 2014]
Resistance of 0.2 M solution of an electrolyte is . The specific conductance of the solution is .The resistance of 0.5 M solution of the same electrolyte is . The molar conductivity of 0.5 M solution
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is:[Main 2014]
In the reaction, the product C is :[Main 2014]
The most suitable reagent for the conversion of is:[Main 2014]
Which one of the following properties is not shown by NO?[Main 2014]
CsCl crystallises in body centred cubic lattice. If ‘a’ is its edge length then which of the following expressions is correct?[Main 2014]
Given below are the half-cell reactions: The for will be:[Main 2014]
The correct statement for the molecule, is:[Main 2014]
In which of the following reactions acts as a reducing agent?(a) (b) (c) (d) [Main 2014]
If Z is a compressibility factor, van der Waals equation at low pressure can be written as:[Main 2014]
For which of the following molecule significant (a) (b) (c) (d)[Main 2014]
Consider separate solutions of , , and at 25°C. Which statement is true about these solutions, assuming all salts to be strong electrolytes?[Main 2014]
The correct set of four quantum numbers for the valence elections of rubidium atom (Z= 37) is:[Main 2014]
For the estimation of nitrogen, 1.4 g of organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of sulphuric acid. The unreacted acid required 20 ml of sodium h
Which one of the following bases is not present in DNA?[Main 2014]
For the reaction, ,if where the symbols have usual meaning thenthe value of x is: (assuming ideality)[Main 2014]
Sodium phenoxide when heated with under pressure at 125°C yields a product which on acetylation produces C.The major product C would be: [Main 2014]
For the non – stoichiometre reaction , the following kinetic data were obtained in three separate experiments, all at 298 KIntial Concentration (A)Initial Concentration (B)Initial rate o formation of
In reactions, the correct order of reactivity for the following compounds: and is:[Main 2014]
On heating an aliphatic primary amine with chloroform and ethanolic potassium hydroxide, the organic compound formed is :[Main 2014]
Which series of reactions correctly represents chemical reactions related to iron and its compound?[Main 2014]
For complete combustion of ethanol, the amount of heat produced as measured in bomb calorimeter, is at 25°C.Assuming ideality the Enthalpy ofcombustion, H,for the reaction will be: [Main 2014]
Considering the basic strength of amines in aqueous solution, which one has the smallest value?[Main 2014]
Among the following oxoacids, the correct decreasing order of acid strength is:[Main 2014]
The equation which is balanced and represents the correct product(s) is:[Main 2014]
The octahedral complex of a metal ion with four monodentate ligands and absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the fo
is equal to[Main 2014]
If z is a complex number such that ,then the minimum value of [Main 2014]
The angle between the lines whose direction cosines satisfy the equations and is[Main 2014]
Let A and B be two events such that and ,where stands for the complement of the event A.Then the events A and B are[Main 2014]
The area of region described by A and is[Main 2014]
The variance of first 50 even numbers is[Main 2014]
If g is the inverse of a function and ,then is equal to[Main 2014]
If and are differentiable function in satisfying and ,then for some [Main 2014]
If and are extreme points of [Main 2014]
If a ∊ R and the equation (where [x] denotes the greatest integer ≤ x) ha no integral solution,then all possible values of a li in the interval[Main 2014]
Let α and β be the roots of equation If are in A.P.and ,then the value of is[Main 2014]
Let the population of rabbits surviving t a time be governed by the differential equation ,then equals[Main 2014]
The image of the line in the plane is the line[Main 2014]
If A is an 3 × 3 non singular matrix such that AA' = A'A and B = A',then BB' equals[Main 2014]
If and ,where n is the set of natural numbers,than is equal to[Main 2014]
The integral dx is equal to[Main 2014]
The integral dx equals[Main 2014]
The forward biased diode connection is:[Main 2014]
The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by 100°C is:(For steel Young's modulus is and coefficient of
During the propagation of electromagnetic waves in a medium:[Main 2014]
A particle moves with simple harmonic motion in a straight line. In first , after starting from rest it travels a distance , and in next it travels , in same direction, then:[Main 2014]
The coercivity of a small magnet where the ferromagnet gets demagnetized is .The current required to be passed in a solenoid of length 10 cm and number of turns 100,so that the magnet gets demagnetize
When a rubber-band is stretched by a distance x,it exerts a restoring force of magnitude where a and b constants.The work done in stretching the unstretched rubber band by L is :[Main 2014]
A student measured the length of a rod and wrote it as 3.50 cm.Which instrument did he use to measure it?[Main 2014]
A thin convex lens made from crown glass ( ) has a focal length .when it is measured in two different liquids having refractive indices ad ,it has the focal lengths and respectively.The correct relati
There is a circular tube in a vertical plane.Two liquids which do not mix and of densities and are filled in the tube.each liquid subtends 90° angle at center. Radius joining their interfaces makes an
one mole of diatomic ideal gas undergoes a cyclic process ABC as shown in figure is adiabatic.The temperature at A,B and C are 400 K,800 K and 600 K respectively.choose the correct statement:[Main 201
On heating water,bubbles being formed at the bottom of the vessel detach and rise.Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel.If
A green light is incident from the water to the air - water interface at the critical angle (θ).Select the correct statements[Main 2014]
In the circuit shown here,the point 'C' is kept connected to point 'A' till the current flowing through the circuit becomes constant.Afterward,Suddenly,point 'C' is disconnected from point 'A' and con
Hydrogen ,Deuterium ,singly ionised Helium and doubly ionised Lithium all have one electron around the nucleus.Consider an electron transition from n = 2 to n = 1.If the wave lengths of emitted radiat
A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric constant 2.2 between them.When the electric filed in the dielectric is V/m,the charge de
A block of mass m is places on a surface with a vertical cross section by .If the coefficient of friction is 0.5,the maximum height above the ground at which the block can be placed without slipping i
The radiation corresponding to 3→ 2 transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter field to T.If the radius of the largest circular p
Match the list-I (Electromagnetic wave type) with list II (Its association/application) and select the correct option from the choices given below the lists. List I List II (a) Infrared waves (i) To t
The current voltage relation of diode is given by I mA,where the applied voltage V is in volts and the temperature T is in degree Kelvin.If student makes an error measuring V while measuring the curre
If the is equal to[Main 2014]
In a large buildings,there are 15 bulbs of 40 W,5 bulbs of 100 W,5 fans of 80 W and 1 heater of 1kW. The voltage of the electric mains is 220V. The minimum capacity of the main fuse of the building wi
Three rods of copper,Brass and Steel are welded together to from a Y -shaped structure.Area of cross-section of each rod ,Each of copper is maintained at 100°C where as ends of brass and steel are kep
A conductor lies along the z-axis at m and carries a fixed current of A in directions(see figure).For a field T,find the power required to move the conductor at constant speed to in .Assume parallel m
Assume that an electric field exists in space. Then the potential difference , where is the potential at the origin and the potential at is :[Main 2014]
A mass 'm' is supported by a massless string wound around a uniform hollow cylinder of mass m and radius R.If the string does not slip on the cylinder,with what acceleration will the mass fall on rele
Four particles,each of mass M and equidistant from each other,move along a circle of radius R under the action of their mutual gravitational attraction.The speed of each particle is:[Main 2014]
From a tower of height H,a particle is thrown vertically upward with a speed u.The time taken by the particle,to hit the ground,is n times that taken by it to reach the highest point of its path.The r
A bob of mass m attached to an inextensible string of the length is suspended from a vertical support.The bob rotates in a horizontal circle with an angular speed rad/s about the vertical.About the po
Two beams,A and B,of plane polarized light mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beams appear equality
An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level.The open end of the tube is then closed and sealed and the tube is raised vertically up by
A pipe of length 85 cm is closed from one end.Find the number of possible natural oscillation of air column in the pipe whose frequencies lie below 1250 Hz.The velocity of sound in air is 340 m/s[Main