The amount of heat evolved when 500 cm^{3 }of 0.1 M HCl is mixed with 200 cm^{3 }of 0.2 M NaoH is
A graph of the x component of the electric field as a function of x in a region of space is shown. The Y and Z components of the electric field are zero in this region. If the electric potential is 10 V at the origin, then potential at x = 2.0 m is :
A metallic charged ring is placed in a uniform magnetic field with its plane perpendicular to the field. If the magnitude of field starts increasing with time, then :
The empirical formula of a nonelectrolyte is CH_{2}O. A solution containing 3g of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution. The molecular formula of the compound is
The mass of glucose that should be dissolved in 50 g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is
A bat flies at a steady speed of 4 ms^{}^{1} emitting a sound of f = 90 ´ 10^{3 }Hz. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be _____.
(Take velocity of sound in air as 330 ms^{}^{1}).
A battery of e.m.f. E has an internal resistance 'r'. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. lf R alone is gradually reduced to zero, which of the following best describes I and V?
A beam of light of wavelength 600 nm from a distant source falls on a single slit 1mm wide and the resulting diffraction pattern is observed on a screen 2m away. The distance between the first dark fringes on either side of the central bright fringe is _______.
A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens?
A planoconcave lens is made of glass of refractive index 1.5 and the radius of curvature of its curved face is 100 cm. What is the power of the lens?
Current 'I' is flowing in a conductor shaped as shown in the figure. The radius of the curved part is r and the length of straight portion is very large. The value of the magnetic field at the centre O will be
Two beams of red and violet colours are made to pass separately through a prism of A = 60°. In the minimum deviation position, the angle of refraction inside the prism will be
At distance of 5cm and 10cm outwards from the surface of a uniformly charged solid sphere, the potentials are 100V and 75V respectively. Then
A conducting rod of length l is moved at constant velocity ‘v_{0}’ on two parallel, conducting, smooth, fixed rails, that are placed in a uniform constant magnetic field B perpendicular to the plane of the rails as shown in figure. A resistance R is connected between the two ends of the rail. Then which of the following is are correct :
A battery of e.m.f. E has an internal resistance 'r'. A variable resistance R is connected to the terminals of the battery. A current I is drawn from the battery. V is the terminal P.D. lf R alone is gradually reduced to zero, which of the following best describes I and V?
In the circuit shown, current through the resistance 2 is i_{1} and current through the resistance 30 is i_{2}. Find the ratio
In the figure shown the switch S_{1} remains connected for long time and the switch S_{2} remains opened. Now the switch S_{2} is closed. Assuming that ε = 10 volt and L = 1H, the magnitude of rate of change of current is 2X (in Amp/sec.) in the inductor just after the switch S_{2} is closed then find X .
A point source of radiation power P is placed on the axis of completely absorbing disc. The distance between the source and the disc is 2 times the radius of the disc. The force that light exerts on the disc is P/4ac then find a (c = speed of light).
In the figure, a conducting rod of length l = 1 meter and mass m = 1 kg moves with initial velocity u = 5 m/s. on a fixed horizontal frame containing inductor L = 2 H and resistance R = 1 . PQ and MN are smooth, conducting wires. There is a uniform magnetic field of strength B = 1T. Initially there is no current in the inductor. Find the total charge in coulomb, flown through the inductor by the time velocity of rod becomes v_{f} = 1 m/s and the rod has travelled a distance x= 3 meter.
In a YDSE arrangement composite lights of different wavelengths λ_{1} = 560 nm and λ_{2} = 400 nm are used. If D = 1m, d = 0.1 mm. If the distance between two nearest completely dark regions is 7X mm then X is :
A unknown liquid has vapour pressure of 76 torr at temperature of 27^{0}C. If the enthalpy of vaporization of liquid is 5.52 kcal/mole, then the normal boiling point of liquid will be : [Take ln10 = 2.3 ; R = 2 cal/moleK]
For a first order reaction, nA → B whose concentration vs time curve is as shown in the figure. If halflife for this reaction is 24 minutes. Find out the value of n.
A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is
In the zinc blende structure, zinc ions occupy alternate tetrahedral voids and S^{2–} ions exist as ccp the radii of Zn^{2+} and S^{2–} ions are 0.83 Å and 1.74 Å respectively. The edge length of the ZnS unit cell is :
Which of the following statement(s) is (are) incorrect ?
A 0.1 M solution of a certain cation will form a precipitate with 0.1 M solution of all these anions ;
OH^{–}, CO_{3}^{2–}, Cl^{–} , SO_{4}^{2–}. Which cation fits this description ?
Which one of the following statements is incorrect ?
A closed organ pipe and an open organ pipe have their first overtones identical in frequency. Their lengths are in the ratio of
A person of mass 60 kg is inside a lift of mass 940 kg and presses the button one control panel. The lift starts moving upwards with an acceleration 1.0 m/s^{2}. If g = 10 ms^{–2}, the tension in the supporting cable is
If Avogadro number N_{A}, is changed from 6.022 × 10^{23} mol^{–1} to 6.022 × 10^{20} mol^{–1}, this would change
Dry air is slowly passed through three solutions of different concentrations, c_{1}, c_{2} and c_{3} ; each containing (non volatile) NaCl as solute and water as solvent, as shown in the Figure If the vessel  2 gains weight and the vessel 3 loses weight, then :
Concentrated aqueous sulphuric acid is 98% H_{2}SO_{4} by mass and has a density of 1.80 g.mL^{–1}. Volume of acid required to make 1 litre of 0.1 M H_{2}SO_{4} solution is:
Which of the following statement(s) is (are) correct for the thiosulphate salt ?
Which of the following statements is/are correct ?
Which of the following statements is/are correct about the above reaction ?
The familiar brown ring test for nitrates depends on the ability of Fe^{2+} to reduce nitrates to nitric oxide, which reacts with Fe^{2+} to form a brown coloured complex [Fe(H_{2}O)_{5}NO^{+}]SO_{4}. What is the oxidation state of iron in the complex. (Only write the number 1, 2, 3, ......)
Determine the number of unpaired electrons in the Cr^{3+} gaseous ions.
In the following sequence of reactions all stereoisomers of (X) have been taken.
Find the Total number of products (Z) formed.
Observe the following reaction sequence carefully.
Find the total number of stereoisomers formed in step (6).
1 g of a monobasic acid dissolved in 200 g of water lowers the freezing point by 0.186ºC. On the other hand when 1 g of the same acid is dissolved in water so as to make the solution 200 mL, this solution requires 125 mL of 0.1 N NaOH for complete neutralization. If α for the acid is x × 10. Find x :
Number of moles of MnO_{4}^{–} required to oxidize one mole of ferrous oxalate completely in acidic medium will be
If the change in the value of g at the height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
The value of ‘g’ at a particular point is 9.8 m/sec^{2} suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of ‘g’ at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become
If x + 2 is a factor of x^{3} – 2ax^{2} + 16, then value of a is
A body weighs 50 grams in air and 40 grams in water. How much would it weigh in a liquid of specific gravity 1.5?
If A class has 175 students . The following data shows the number of students offering one or more subjects. Mathematics 100 ; Physics 70 ; Chemistry 40 ; Mathematics and Physics 30 ; Mathematics and Chemistry 28 ; Physics and Chemistry 23 ; Mathematics , Physics and Chemistry 18 . How many students have offered Mathematics alone ?
If A is a diagonal matrix of order ‘n’ such that A^{3}A^{–1} = A, then number of possible values of matrix A, is
If f(x) = x + e^{x}, and g(x) is the inverse function of f(x), then g``(A) equals
If f (x) = x + x + cos ([π^{2}] x) and g (x) = sin x then ([.] denotes greatest integer function) :
Two beams of red and violet colours are made to pass separately through a prism of A = 60°. In the minimum deviation position, the angle of refraction inside the prism will be
If one of the factor of x^{2} + x – 20 is (x + 5). Find the other
Threefourth of the number of girls in a school is equal to half of the number of boys. If the school has 1420 pupils, how many of them are boys ?
Compare the statements A and B.
Statement A: Synthesis of DNA takes place in the Sphase of interphase.
Statement B: Every chromosome, during metaphase, has two chromatids.
Choose the correct description :
Find the volume of the tetrahedron, if lengths of two opposite sides are 2 and 4 respectively and the shortest distance between them is 6 and these sides are inclined at 30º.
The position vectors of two points A and C are respectively. The point of
intersection of the lines containing vectors is P. If vector is
perpendicular to and PQ = 15 units, then possible position vectors of Q are and Find the value of
Find the smallest positive integer 'p' for which the equation cos (p sinx) = sin (p cosx) has a solution in [0, 2π].
Let image of the line in the plane 2x – y + z + 3 = 0 be L. A plane 7x + By + Cz + D = 0 is such that it contains the line L and is perpendicular to the plane 2x – y + z + 3 = 0, then find the value of D + 3C.
Image Q of the point P(1, 3, 4) in the plane is
Let S be the point of intersection of the given line & plane, then the coordinates of S are (3r + 1, 5r + 3, 2r + 4)
It lies on the plane
⇒ 2(3r + 1) – (5r + 3) + 2r + 4 + 3 = 0 ⇒ r = – 2
Hence, coordinate of 'S' are (–5, –7, 0)
therefore, equation of QS line is.
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