Recent questions tagged past papers

In electrolysis of NaCl when Pt electrode is taken then $H_2$ is liberated at cathode while with Hg cathode it forms sodium amalgam : -

asked Jul 23, 2018 by pady_1

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Which reaction is not feasible : -

asked Jul 23, 2018 by pady_1

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2 mole of ideal gas at $27^{\circ}C$ temperature is expanded reversibly from 2 lit. to 20 lit. Find entropy change (R = 2 cal/mol K) : -

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In a closed insulated container a liquid is stirred with a paddle to increase the temperature which of the following is true : -

asked Jul 23, 2018 by pady_1

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Vander waal's real gas, act as a ideal gas, at which conditions : -

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Unit of entropy is : -

asked Jul 23, 2018 by pady_1

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Solution of 0.1N $NH_4 OH$ and 0.1N $NH_4Cl$ has pH 9.25, Then find out $PK_b$ of $NH_4OH$ : -

asked Jul 23, 2018 by pady_1

1 answer

Which has highest pH : -

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1 M and 2.5 litre NaOH solution mixed with another 0.5 M and 3 litre NaOH solution. Then find out molarity of resultant solution : -

asked Jul 23, 2018 by pady_1

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Solubility of $MX_2$ – type electrolytes is $0.5 \times 10^{–4}$ Mole/lit. then find out $K_{sp}$ of elctrolytes : -

asked Jul 23, 2018 by pady_1

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Reaction $BaO_2 (s) \rightleftharpoons BaO (s) + O_2(g)$; $\bigtriangleup H = + ve$. In equilibrium condition. Pressure of $O_2$ is depends on : -

asked Jul 23, 2018 by pady_1

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Which of the following are suitable for the fusion process : -

asked Jul 23, 2018 by pady_1

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Identical charges (–q) are placed at each corner of a cube of side 'b' then electrical potential energy of charge (+q) which is placed at centre of cube will be

asked Jul 23, 2018 by pady_1

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A capacitor of capacity $C_1$ charged upto V volt and then connected to an uncharged capacitor $C_2$. Then final P.D. across each will be

asked Jul 23, 2018 by pady_1

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To convert a galvanometer into a voltmeter one should connect a : -

asked Jul 23, 2018 by pady_1

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For a cell terminal P.D. is 2.2V when circuit is open and reduces to 1.8V when cell is connected to a resistance of R = 5$\Omega$. Determine internal resistance of cell (r) is then : -

asked Jul 23, 2018 by pady_1

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Some charge is being given to a conductor. Then its potential : -

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A wave travelling in positive X-direction with A = 0.2 m velocity = 360 m/s and $\lambda$ = 60 m, then correct expression for the wave is : -

asked Jul 23, 2018 by pady_1

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For a transistor $\frac{I_C}{I_E}$ = 0.96, then current gain for common emitter configuration : -

asked Jul 23, 2018 by pady_1

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If kinetic energy of a body is increased by 300% than percentage change in momentum will be

asked Jul 23, 2018 by pady_1

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A rod of length is 3m and its mass acting per unit length is driectly proportional to distance x from one of its end then its centre of gravity from th end will be at : -

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A particle (A) is droped from a height and another particle (B) is projected in horizontal direction with speed of 5 m/s from the same height then correct statement is : -

asked Jul 23, 2018 by pady_1

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A lift of mass 1000 Kg which is moving with acceleration of 1 $\frac{m}{s^2}$ in upward direction, then the tension developed in string which is connected to lift is : -

asked Jul 23, 2018 by pady_1

2 answers

Consider two rods of same length and different specific heats ($S_1$, $S_2$), conductivities ($K_1$, $K_2$) a area of cross-sections ($A_1$, $A_2$) and both having temperature $T_1$ and $T_2$ at their ends. If rate of lo of heat due to conduction is equal, then :-

asked Jul 23, 2018 by pady_1

1 answer

For a black body at temperature 727ºC, its radiating power is 60 watt and temperature of surrounding is 227ºC. If temperature of black body is changed to 1227ºC then its radiating power will be : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is best close to an ideal black body : -

asked Jul 23, 2018 by pady_1

2 answers

The Wien's displacement law express relation between : -

asked Jul 23, 2018 by pady_1

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A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls is 'd' then required focal length of lens placed in between the walls is : -

asked Jul 23, 2018 by pady_1

1 answer

Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye. The wavelength of light is 5000 Å :-

asked Jul 23, 2018 by pady_1

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The value of plank's constant is : -

asked Jul 23, 2018 by pady_1

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For the given incident ray as shown in figure, the condition of total internal reflection of this ray the minimum refractive index of prism will be : - 45Âº incident ray

asked Jul 23, 2018 by pady_1

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A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about geometrical axis. It is possible with : -

asked Jul 23, 2018 by pady_1

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When an oscillator completes 100 oscillation its amplitude reduced to $\frac{1}{3}$ of initial value. What will be its amplitude, when it completes 200 oscillation : -

asked Jul 23, 2018 by pady_1

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A mass is suspended separately by two different springs in successive order then time period is $t_1$ and $t_2$ respectively. If it is connected by both spring as shown in figure then time period is $t_0$, the correct relation is :

asked Jul 23, 2018 by pady_1

1 answer

If a $_a^b X$ species emits firstly a positron, then two $\alpha$ and two $\beta$ and at last one $\alpha$ is also after intially it fainally convets into stable $_d^cY$ species so correct relation will be : -

asked Jul 20, 2018 by pady_1

1 answer

Solubility of a $M_2S$ salt is $3.5 \times 10^{–6}$ then find out solubility product : -

asked Jul 20, 2018 by pady_1

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Ionisation constant of $CH_3COOH$ is $1.7 \times 10^{–5}$ and concentration of $H^+$ ions is $3.4 \times 10^{–4}$. Then find out initial concentration of $CH_3COOH$ molecules :-

asked Jul 20, 2018 by pady_1

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Nitrogen form $N_2$, but phosphorous form $P_2$, it's at a time convert in $P_4$, reason is :

asked Jul 20, 2018 by pady_1

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Zn convert it's melted state to its solid state, it has HCP structure, then find out nearest no. of nearest atom : -

asked Jul 20, 2018 by pady_1

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The most convenient method to protect the bottom of ship made of iron is : -

asked Jul 20, 2018 by pady_1

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The Beans are cooked earlier in pressure cooker, because : -

asked Jul 20, 2018 by pady_1

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In $HS^–$, $I^–$, $R–NH_2, NH_3$ order of proton excepting tendency will be :-

asked Jul 20, 2018 by pady_1

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The following quantum numbers are possible for how many orbital n = 3, l = 2, m = +2

asked Jul 20, 2018 by pady_1

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Which of the following will exhibit maximum ionic conductivity : -

asked Jul 20, 2018 by pady_1

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Main axis of a diatomic molecule is z, molecular orbtial $p_x$ and $p_y$ overlaps to form, which of the following orbital : -

asked Jul 20, 2018 by pady_1

2 answers

In X- H ----- Y, X and Y both are electronegative elements :

asked Jul 20, 2018 by pady_1

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Which of following organometallic compound is $\sigma$ and $\pi$ bonded : -

asked Jul 20, 2018 by pady_1

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Which statement is incorrect : -

asked Jul 20, 2018 by pady_1

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Coordination number of $Ni$ in $[Ni(C_2O_4)_3] ^{4-}$ is

asked Jul 20, 2018 by pady_1

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Which of the following will give maximum number of isomers : -

asked Jul 20, 2018 by pady_1

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