Recent questions tagged past papers

Correct order of $I^{st}$ IP among following elements Be, B, C, N, O is : -

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Which of the following statement is not correct

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In which of the following bond angle is maximum :

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Which of the following two species in the pair are isostructural :-

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$PbO_2 \to PbO \; \; \; \; \; \Delta G_{298} < 0$ $SnO_2 \to SnO \; \; \; \; \; \Delta G_{298} > 0$ Most probable oxidation state of Pb & Sn will be :

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Which is not correct regarding the adsorption of a gas on surface of solid: -

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Standard electrode potential are $Fe^{+2}/Fe\; \; \;$ $\;\; \;E^o = -0.44$ $Fe^{+3}/Fe^{+2} \; \; \;$ $\; \; \; E^o = 0.77$ If $Fe^{+2}, Fe^{+3}$ and $Fe$ block are kept together, than :-

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Pure water can be obtain from sea water by

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Specific volume of cylindrical virus particle is $6.02 \times 10^{–2} cc/gm$. Whose radius and length are 7 Å & 10Å respectively. If $N_A = 6.02 \times 10^{23}$. Find mol. wt. of virus : -

asked Jul 20, 2018 by pady_1

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Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt = 78.4) then minimum molecular weight of peroxidase anhydrous enzymes is : -

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Molarity of liquid HCl if density of liq. HCl is 1.17 gm/cc : -

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When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is $10^{–6}$ times, than activation energy of reaction in the presence of enzyme is : -

asked Jul 20, 2018 by pady_1

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A human body required the 0.01 Curie activity of radioactive substance after 24 hours. Half life of radioactive is 6 hours. Then max. activity of radioactive substance that can be injected will be : -

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For the reaction $2N_2O_5 \to 4NO_2 + O_2$ rate and rate constant are $1.02 \times 10^{–4}$ and $3.4 \times 10^{–5} sec^{–1}$ respectively.Then concentration of $N_2O_5 $ at that time will be : -

asked Jul 20, 2018 by pady_1

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Enthalpy of $CH_4 + \frac{1}{2} O_2 \to CH_3OH$ is negative. If enthalpy of combustion of $CH_4$ and $CH_3OH$ and x and y respectively. Then which relation is correct : -

asked Jul 20, 2018 by pady_1

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When 1 mol gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct : -

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Change in enthalpy for reaction $2 H_2O_2 (\ell) \to 2 H_2O (\ell) + O_2 (g)$ If heat of formation of $H_2O_2 (\ell) $ and $H_2O (\ell)$ are -188 & -286 KJ/mol respectively :-

asked Jul 20, 2018 by pady_1

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A compound of molecular formula is $C_7H_{16}$ shows optical isomerism, compound will be

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In steam distillation of toluene, the pressure of toluene in vapour is :-

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<img src= ""/> which statement is incorrect about peptide bond :-

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Which is correct statement :-

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Which of the following is correct about H- bonding in nucleotide :-

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Which of following is correct :-

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In preparation of alkene from alcohol using $Al_2O_3$ which is effective factor :-

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The incorrect IUPAC name is : -

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Which of the following is correct : -

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Which of the following is not correctly matched

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Which of following give positive Fehling solution test

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Which of the following is incorrect :-

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An organic compound $A(C_4H_9Cl)$ on reaction with $Na$/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is :-

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Which alkene on ozonolysis gives

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The correct acidic order of following is : -

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Energy is released in nuclear fission is due to

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A 1 kg stationary bomb is exploded in three parts having mass 1 : 1 : 3 respectively. Parts having same mass move in perpendicular direction with velocity 30 $ms^{–1}$, then the velocity of bigger part will be

asked Jul 20, 2018 by pady_1

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$M_n$ and $M_p$ represet the mass of neutron and proton respectively. An element having mass M has N neutron and Z-protons, then the correct relation will be : -

asked Jul 20, 2018 by pady_1

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A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance become d/2, then number of electrons emited per second will be : -

asked Jul 20, 2018 by pady_1

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250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3m, the efficiency of pulley system will be : -

asked Jul 20, 2018 by pady_1

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In BCC, the distance between two nearest atoms will be : -

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Copper and silicon is cooled from 300 K to 60 K, the specific resistance : -

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The resistance of each arm of the wheat stone bridge is 10 ohm. A resistance of 10 ohm is connected in series with galvanometer then the equivalent resistance across the battery will be :

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Among which the magnetic susceptibility does not depend on the temperature : -

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The energy of hydrogen atom in $n^{th}$ orbit is $E_n$ then the energy in nth orbit of singly ionised helium atom will be : -

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The interplaner distance in a crystal is $2.8\times 10^{-8}$ m. The value of maximum wavelength which can be diffracted

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The equation of a wave is represented by $y = 10^{-4} \sin (100t - \frac{x}{10}) m$, then the velocity of wave will be :-

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If number of turn, area and current through it is given by n, A and i respectively then its magnetic moment will be :-

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A dipole of moment $\overrightarrow{p}$ is placed in uniform electric field $\overrightarrow{E}$ then torque acting on it is given by :-

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For a common emmiter circuit if $\frac{I_C}{I_E} = 0.98$ then current gain for common emitter circuit will be :-

asked Jul 20, 2018 by pady_1

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For a coil having $L=2$ mh, current flow through it is $I = t^2 e^{-t}$ then the time at which emf become zero :-

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