Recent questions tagged past papers

Maximum oxidation state will be of :

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Schottky defect shows :

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Maximum impurity in Pig iron will be of :

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Number of significant number will be in following numbers : <br> a)161 cm b)0.0161 c)1.61

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Which of the following gives colour with the water :

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First ionization potential of Be and B will be :

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1% solution of other compound is isotonic with 5% sucrose (sugar) solution. Then molecular wt. of compound will be :

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When $X\rightarrow{_7N^{14}}+2\beta^-$ – then number of neutron will be in X :

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$_nX^m$ emitted one $\alpha$ and $2\beta$ particles, then it will become :

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Number of isomers of $[Pt(NH_3)_4][CuCl_4]$ complex are :

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The chiral centre is absent in :

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The fertilizer which makes the soil acidic :

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In which of the following molecule. The internuclear distance will be maximum :

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Density of which of the following substance not decreases on adding $Br_2$ vapours :

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$A + B \rightleftharpoons C + D Constant = K_{1}$<br> $E + F \rightleftharpoons G + H Constant = K_{2}$ <br> then $C + D + E + F \Rightarrow$ product. The constant of reaction will be :

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The cell reaction of an electrochemical cell is $Cu^{+2}(C_1) + Zn \rightarrow Zn^{+2}(C_2) + Cu$. The change in free energy will be the function of :

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The concentration of $ZnCl_{2}$ solution will change when it is placed in a container which is made of :

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When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of bunsen burner A, B, C and D respectively are:

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The number of antibonding electron pair in $O{_2}^{-2}$ is :

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Which of the following molecule is not paramagnetic :

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A complex compound which is formed by ligands nitrate and chloride. It gives two moles of AgCl precipitate with $AgNO_{3}$ . What will be its formulae :

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Aniline reacts with $Br_{2}$ water, $NaNO_{2}/HCl$ gives respectively :

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Which of the following does not give nucleophilic substitution with alcohol :

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2-Bromo pentane reacts with ethanolic KOH gives main product :

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The base found in DNA but not in RNA :

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Glucose +x phenyl hydrazine $\rightarrow$ osazone 'x' will be :

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Percentage of C, H & N are given as follows : C = 40% H = 13.33% N = 46.67% The empirical formula will be :

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Which of the following does not give claisen condensation reaction :

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Which of the following is not the characteristic of arenes :

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Which of the following does not given iodoform test :

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IUPAC name of

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Aspirin can be prepared by the reaction of acetyl chloride with :

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Correct order of –I effect is :

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A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force F sin $\omega$t. If the amplitude of the particle is maximum for $\omega$ = $\omega_{1}$ and the energy of the particle maximum for $\omega$ = $\omega_{2}$, then :

asked Jun 15, 2018 by pady_1

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A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to :

asked Jun 15, 2018 by pady_1

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We consider a thermodynamic system. If $\Delta$U represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?

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Common emitter circuit is used as amplifier, its current gain is 50. If input resistance is 1 k$\Omega$ and input voltage is 5 volt then output current will be :

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The cause of potential barrier in a P–N junction diode is :

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Radiation energy corresponding to the temperature T of the sun is E. If its temperature is doubled, then its radiation energy will be :

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A rigid rod is placed against the wall as shown in figure. When its velocity of lower end is $10 ms^{ â€“1}$ and its base makes an angle $\alpha$ = 60Â° with horizontal, then the vertical velocity of its end B will be :

asked Jun 15, 2018 by pady_1

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for nuclear reaction : $_{92}U^{235} +_0 n^1 \longrightarrow _{56}Ba^{144}+........+3_0n^1$

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If a source moves perpendicularly from listener then the change in frequency will be :

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Turn ratio of a step-up transformer is 1 : 25. If current in load coil is 2A, then the current in primary coil will be :

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Electric field at the equator of a dipole is E. If strength and distance is now doubled then the electric field will be :

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In the Bohr model of H-atom, an electron (e) is revolving around a proton (p) with velocity v, if r is the radius of orbit and m is mass and $\varepsilon_{0}$ is vacuum permittivity, the value of v is :

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A charge q is placed in an uniform electric field E. If it is released, then the K.E of the charge after travelling distance y will be :

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A car is moving with velocity V. If stop after applying break at a distance of 20 m. If velocity of car is doubled, then how much distance it will cover (travel) after applying break :

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In hot wire Ammeter due to flowing of current temperature of wire is increased by 5°C. If value of current is doubled, then increases in temperature will be :

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A standing wave having 3 nodes and 2 antinodes is formed between 1.21 Å distance then the wavelength is :

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If the frequency of a spring is n after suspending mass M, now 4M mass is suspended from spring then the frequency will be :

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