Recent questions tagged 2008

In the hydrocarbon, $\overset{6}{CH_3}—\overset{5}{CH}=\overset{4}{CH}—\overset{3}{CH_2}—\overset{2}{C} \equiv \overset{1}{CH_6}$ The state of hybridization of carbons 1, 3,5 and are in the following sequence :

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Which of the following are not state functions? (I) q+w (II) q (III) w (IV) H-TS

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The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

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In which of the following co-ordination entities the magnitude of $\bigtriangleup_o$ (CFSE in octahedral field) will be maximum? (Atomic number of Co=27)

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An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be :

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Kohlrausch's Law states that at :

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Which one of the following is an amine hormone ?

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The value of $K_{p1}$ and $K_{p2}$ for the reactions $X\rightleftharpoons Y + Z$ ....(1) and $A \rightleftharpoons2B$ ....(2) are in ratio of 9 : 1. If degree of dissociation o X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio :

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The value of equilibrium constant of the reaction, $HI(g)\rightleftharpoons \frac{1}{2}H_2(g)+\frac{1}{2}I_2(g)$ is 8.0. The equilibrium constant of the reaction, $H_2(g)+I_2(g)\rightleftharpoons2HI(g)$ will be -

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Percentage of free space in a body centered cubic unit cell is -

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The angular shape of ozone molecule$(O_3)$ consists of -

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Bond dissociation enthalpy of $H_2$ , $Cl_2$ and HCl are 434, 242 and 431 kJ $mol^{ –1}$ respectively. Enthalpy of formation of HCl is -

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Volume occupied by one molecule of water ($density = 1g cm^{ –3}$) is :

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Acetophenone when reacted with a base, $C_2 H_5ONa$, yields a stable compound which has the structure :

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The stability of carbanions in the following : (i) $R-C \equiv \overset{\Theta}{C}$ (ii) <img src =" "/> (iii) $R_2C=\overset{\Theta}{CH}$ (iv) $R_3Câ€“\overset{\Theta}{C}H_2$ is in the order of :

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The sequence of ionic mobility in aqueous solutions is -

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Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

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Base strength of - (i) $H_3C\overset{\Theta}{C} H_2$ (ii) $H_2C=\overset{\Theta}{C} H$ and (iii) $H-C \equiv \overset{\Theta}{C}$ is in the order of -

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In DNA, the complementary bases are -

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The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of -

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Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^+$ ion concentration in the mixture ?

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What volume of oxygen gas ($O_2$ ) measured at 0ºC and 1 atm, is needed to burn completely one litre, of propane gas ($C_3H_8$) measured under the same conditions ?

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Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

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A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of $10 \Omega$. Its internal resistance is -

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The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius around their respective axes is -

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A circular disc of radius 0.2 metre is placed in uniform magnetic field of induction $\frac{1}{\pi}[\frac{Wb}{m^2}]$ in such a way that its axis makes an angle of $60^o$ with $\overrightarrow{B}$ . The magnetic flux linked with the disc is -

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A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill i between -

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At 10ºC the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110ºC this ratio is -

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Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is -

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In an A.C. circuit the emf (e) and the current (i) at any instant are given respectively by : $e=E_0 \sin \omega t$ $i=I_0 \sin(\omega t-\phi)$ The average power in the circuit over one cycle of A.C. is -

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A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is

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A galvanometer of resistance 50 $\Omega$ is connected to a battery of 3V along with a resistance of 2950 $\Omega$ in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be -

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The voltage gain of an amplifier with 9 % negative feedback is 10. The voltage gain without feedback will be -

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The ground state energy of hydrogen atom is –13.6 eV. When its electron is in the first excited state, its excitation energy is -

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The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is :

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Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10 % of energy. How much power is generated by the turbine ? (g = 10${\frac{m}{s}}^ 2$)

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If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal i

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Two simple Harmonic Motions of angular frequency 100 and 1000 rad $s^{–1}$ have the same displacement amplitude. The ratio of their maximum accelerations is -

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Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/s. What is the phase difference between the oscillations of two points ?

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The velocity of electromagnetic radiation in a medium of permittivity $\epsilon_0$ and permeability $\mu_0$ is given by :

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The electric potential at a point in free space due to a charge Q coulomb is $Q\times 10^{11}$ volts. The electric field at that point is -

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A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly :

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A thin rod of length L and mass M is bent at it midpoint into two halves so that the angle between them is 90º. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is -

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The circuit is equivalent to

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If the error in the measurement of radius of a sphere is 2 % then the error in the determination of volume of the sphere will be -

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In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of -

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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature $20^oC$ ? The temperature of boiling water is $100^oC$.

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Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be -

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A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of $3\times10^ 6 ms^{–1}$. The velocity of the particle is : (mass of electron = $9.1\times10^{–31}$ kg)

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