Recent questions tagged past papers

Which is the molecular formula of gypsum ?

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Which of the following is used in the preparation of generated water (soda) ?

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What is the appromiate calorific value of water gas in $kcal\; m^{-3}$ ?

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Which of the following is an acid?

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What is the molecular formula of white phosphorus ?

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During Serpeck's process silica is eliminated as :

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Which of the following reacts with $BCl_3$ to form diborane ?

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Which of the following react with water to give ethane ?

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Which of the following hydrocarbon has least carbon-carbon bond length ?

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Which of the following reacts with ammonical cuprous chloride ?

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Ethylene reacted with bromine in $CCl_4$ to form $X$. $X$ is treated with alcoholic $KOH$ to give $Y$. $X$ and $Y$ are respectively :

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Chloroethane reacts with magnesium in dry ether to form $X$. When $X$ is hydrolysed a carbon compound $Y$ and $Z$ are formed. Which of the following is $Y$?

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A solid organic compound $Y$ on heating is converted into vapour directly; which on cooling solidifies, which of the following is the correct method of purifying it ?

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What is the approximate quantity of electricity (in coulomb) required to deposit all the silver from $250\;mL$ of $1M\; AgNO_3$ aqueous solution ?

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The equilibrium constant for the reaction $H_{2(g)} + I_{2(g)} \leftrightharpoons 2HI_{(g)}$ is $64$ at a certain temperature. The equilibrium concentrations of $H_2$ and $HI$ are $2\;mol/L$ and $16\; mol/L$ respectively. What is the equilibrium concentrations (in $mol/L$) of $I_2$ ?

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What is the catalyst used in the manufacture of sulphuric acid by contact process ?

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What are the values of $n_1$ and $n_2$ for the 2nd line in the Lyman series of hydrogen atomic spectrum ?

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Which of the following is the isotope of $Ge_{32}^{76} $ ?

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Which of the following has the lowest bond angle ?

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What is the oxidation state of chlorine in hypoclorous acid ?

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Which of the following is the strongest oxidising agent ?

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Which of the following ions is colourless in aqueous solution ?

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Which of the following is a sulphide ore ?

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Calculate the heat of the formation $(\Delta H)$ of $CO$ (in kcal) from the following data : <br> $I. \; C_{(graphite)} + O_{2(g)} \to CO_{2(g)} \; \; \; \; \; \; \Delta H = -94 \; kcal$ <br> $II. \; CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)} \; \; \; \;\; \; \Delta H = -68\; kcal $

asked Dec 19, 2018 by pady_1

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The r.m.s velocity of an ideal gas at $300\; K$ is $12240\; cm/sec$. What is the most probable velocity at that temperature ?

asked Dec 19, 2018 by pady_1

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The total pressure of a mixture of 6.4 of $O_2$ and 5.6 g of $N_2$ present in a 2 litre vessel is $1200\;mm$. What is the partial pressure (in mm) of nitrogen ?

asked Dec 19, 2018 by pady_1

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A non-volatile solute (A) is dissolved in a volatile solvent (B). The vapour pressure of the resultant solution is $P_S$. The vapour pressure of pure solvent is $P_B$. If $X_B$ is the mole fraction of the solvent which of the following is correct :

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Which of the following reacts with ethanol to form chloroform ?

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The focal length of the lenses of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is :

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A source producing sound of frequency $170 \; Hz$ is approaching a stationary observer with a velocity of $17\;ms^{-1}$. The apparent change in the wavelength of sound heard by the observer is : (speed of sound in air = $340\; ms^{-1}$)

asked Dec 19, 2018 by pady_1

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If vibrating tuning fork of frequency $255 \;Hz$ is moving wih a velocity $4\;ms^{-1}$ towards the wall the number of beat heard per second is (speed of sound in air = $340\;ms^{-1}$) :

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The frequency of a stretched uniform wire under tension is in resonance with the fundamental frequency of a closed tube. If the tension in the wire is increased by 8 N, it is in resonance with the first over-tone of the closed tube. The initial tension in the wire is :

asked Dec 19, 2018 by pady_1

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Two metal rods A and B of equal lengths and equal cross-sectional areas are joined end to end. The coefficients of thermal conductivities of A and B are in the ratio 2:3, when the free end of A is maintained at $100^{\circ}C$ and the free end of B is maintained at $0^{\circ}C$, the temperature of the junction is :

asked Dec 19, 2018 by pady_1

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The liquids at temperature $60^{\circ}C$ and $30^{\circ}C$ respectively have masses in the ratio $3:4$ and their specific heats in the ratio $4:5$. If the two liquids are mixed, the resultant temperature is :

asked Dec 19, 2018 by pady_1

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An ideal gas at a pressure of $1\;atm$ and temperature of $27^{\circ}C$ is compressed adiabatically until its pressure becomes 8 times the initial pressure , then final temperature is :$ (\gamma = 3/2)$

asked Dec 19, 2018 by pady_1

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A flask is filled with $1.3\;g$ of an ideal gas at $27^{\circ}C$ and its temperature is raised to $52^{\circ}C$. The mass of the gas that has to be released to maintain the temperature of the released to maintain the temperature of the gas in the flask at $52^{\circ}C$ and the pressure remaining the same is :

asked Dec 19, 2018 by pady_1

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A vessel is filled with an ideal gas at a pressure of $10$ atmosphere and temperature $27^{\circ}C$. Half of the mass of the gas is removed from the vessel and temperature of the remaining gas is increased to $87^{\circ}C$. Then the pressure of the gas in the vessel will be :

asked Dec 19, 2018 by pady_1

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When a liquid in a glass vessel, is heated its apparent expansion is $10.30 \times 10^{-4}/^{\circ}C$ same liquid when heated in a metal its apparent expansion $10.06 \times 10^{-4}/^{\circ}C$. The coefficient of linear expansion of the metal is : (coefficient of linear expansion of glass = $9 \times 10^{-6}/^{\circ}C$) :

asked Dec 19, 2018 by pady_1

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8000 identical water drops are combined to form a big drop. The the ratio of final surface energy to the initial surface energy of all the drops together is :

asked Dec 19, 2018 by pady_1

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When a uniform wire of radius $r$, is stretched by a $2\;kg$ weight the increase in its length is $2.00\; mm$ If the radius of the wire is $\frac{r}{2}$ and other conditions remining the same, the increase in its length is :

asked Dec 19, 2018 by pady_1

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A particle executing simple harmonic motion has an amplitude of $6\;cm$. Its acceleration at a distance from the mean position $2\;cm$ is $8\;cm/sec^2$. The maximum speed of the particle is :

asked Dec 19, 2018 by pady_1

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A body of mass $1 \; kg$ is executing simple harmonic motion. Its displacement $y\;cm$ at $t\;sec$ is given by $y = 6 \sin (100 t + \frac{\pi}{4})$ its maximum kinetic energy is :

asked Dec 19, 2018 by pady_1

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The height of the point vertically above the earth's surface at which acceleration due to gravity becomes 1% of its value at the surface is : (Radius of the earth = R)

asked Dec 19, 2018 by pady_1

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$R$ and $r$ are the radii of the earth and moon respectively, $\rho_e$ and $\rho_m$ are densities of earth and moon respectively . The ratio of the acceleration due to gravity on the surfaces of the moon and earth, is :

asked Dec 19, 2018 by pady_1

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A wheel has a speed of $1200$ revolution per minute and is made to slow down at a rate of $4\; radian/sec^2$. The number of revolutions it makes before coming to rest is :

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The radius of gyration of a sphere of mass $M$ and radius $R$ about the axis parallel to the axis passing through its centre and tangent to the sphere is :

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A body is sliding down an inclined plane having coefficient of friction 0.5. If the normal reaction is twice that of the resultant downward force along the incline the angle between the inclined plane and the horizontal is :

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A 1.0 HP motor pumps out water from a well of 30 m and fills a water tank of volume 2238 litres at a height of 10 m from the ground. The running time of the motor to fill the empty water tank is :

asked Dec 19, 2018 by pady_1

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A ball is projected vertically down with an initial velocity from a height of 20 m on to a horizontal floor. During the impact it losses 50% of the energy and rebounds to the same height, the initial velocity of its projection is :

asked Dec 19, 2018 by pady_1

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A body of mass $m_1$ moving with a velocity $10\;ms^{-1}$ collides with another body at rest of mass $m_2$. After collision the velocities of the two bodies are $2\;ms^{-1}$ and $5 \; ms^{-1}$ respectively, along the direction of motion of $m_1$. The ratio $\frac{m_1}{m_2}$ is :

asked Dec 19, 2018 by pady_1

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