Recent questions tagged class12

The osmotic pressures of equimolar solutions of glucose, potassium chloride and Barium chloride will be in the order

asked Feb 13, 2014 by sreemathi.v

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Which of the following is the correct expression for van't Hoff factor?

asked Feb 13, 2014 by sreemathi.v

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A pin is placed $10 cm$ in front of a convex lens of focal length $20 cm$ made of a material having refractive index $1.5$. The surface of lens is further away from P in is silvered and has a radius of curvature $22 \;cm$ Then position of final image will be :

asked Feb 13, 2014 by meena.p

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When a solute is dissolved in a solvent,the elevation of boiling point of solution is

asked Feb 13, 2014 by sreemathi.v

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Which one of the following aqueous solution will exhibit abnormal osmotic pressure?

asked Feb 13, 2014 by sreemathi.v

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The focal length of a Plano convex lens when curved surface is silvered and object is in front of plane surface is :-

asked Feb 13, 2014 by meena.p

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A 2% solution of non electrolyte X is isotonic with 1% of urea(mol.wt.60),the molecular weight of X is

asked Feb 13, 2014 by sreemathi.v

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A 0.3%(w/v) solution of urea (mol.wt.60) would be isotonic with

asked Feb 13, 2014 by sreemathi.v

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The focal length of a Plano convex lens when plane surface is silvered and object is in front of curved surface is

asked Feb 13, 2014 by meena.p

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Which one of the following pair of solutions are expected to be isotonic at the same temperature?

asked Feb 13, 2014 by sreemathi.v

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Calculate osmotic pressure of a solutions having $0.1\; M\;NaCl$ and $0.2\; M\; Na_2SO_4$ and $0.5 M\; HA$. (Given: Weak acid is 20% dissociated at $300^{\circ}K$)

asked Feb 13, 2014 by sreemathi.v

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Osmotic pressure of a dilute solution is

asked Feb 13, 2014 by sreemathi.v

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Isotonic solutions have the same

asked Feb 13, 2014 by sreemathi.v

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Lets say you enter a Chess tournament. The probability of winning a game against half the players is 0.3, the probability of winning against one quarter of them is 0.4 and the probability of winning against the remaining one quarter is 0.5. Let's say you play against a randomly chosen opponent. What is your probability of winning?

asked Feb 12, 2014 by balaji.thirumalai

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Two convex lenses of focal length 20 cm are placed co axially with separation of 60 cm between them. Find image of distant object.

asked Feb 12, 2014 by meena.p

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Convex lens of 10 cm focal length is combined with a concave lens of 6 cm focal length. Find focal length of combination.

asked Feb 12, 2014 by meena.p

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Find the electric field caused by a disc of radius "a" with a uniform charge density $\;\sigma\;$ , at a point along the axis of the disc a distance x from its centre .

asked Feb 12, 2014 by yamini.v

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A lens has a power of +5 diopters in air. What will be power if completely immersed in water? $_a \mu_w =\large\frac{4}{3}$ and $_a \mu_g =\large\frac{3}{2}$

asked Feb 12, 2014 by meena.p

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Which one of the following statement is incorrect about osmotic pressure?

asked Feb 12, 2014 by sreemathi.v

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A convergent lens of 6 diopters is combined with a diverging lens of -2 diopters.Then the power and focal length is

asked Feb 12, 2014 by meena.p

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Consider a spherical surface of radius 4m centred at the origin . Point +q and -2q are fixed at points $\;A (2m , 0 , 0)\;$ and $\;B (8m , 0 ,0)\;$ respectively . The potential on the surface of sphere is

asked Feb 12, 2014 by yamini.v

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Two liquids X and Y are separated by a semipermeable membrane and if liquid flows from X to Y,it indicates that

asked Feb 12, 2014 by sreemathi.v

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Osmotic pressure of a solution can be measured quickly and accurately by

asked Feb 12, 2014 by sreemathi.v

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Two aqueous solution X and Y are separated by a semipermeable membrane.If the vapour pressure of solution X is greater than the vapour pressure of solution Y,then the solvent water

asked Feb 12, 2014 by sreemathi.v

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An object is placed at an of 45 cm from a converging lens of focal length 30 cm . A mirror of radius of curvature 40 cm is to be placed on other side of lens so that the object coincides with its image. Find the distance of mirror from lens if mirror is convex.

asked Feb 12, 2014 by meena.p

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Which one of the following completely dissociated salt solutions will give the lowering of vapour pressure double from its theoretical value?

asked Feb 12, 2014 by sreemathi.v

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The relative lowering of vapour pressure is equal to the molar fraction.This law is known as

asked Feb 12, 2014 by sreemathi.v

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What is the difference between Bayes theorem and Total Probability theorem?

asked Feb 12, 2014 by sindhusankar30_1

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Relative lowering of vapour pressure is directly proportional to

asked Feb 12, 2014 by sreemathi.v

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Which one of the following aqueous solution posses lowest vapour pressure?

asked Feb 12, 2014 by sreemathi.v

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An object is placed at a distance of 10 cm to left on axis of a convex lens A of focal length 20 cm.Another convex lens of focal length 10 cm is placed co-axially to the right of the lens A at a distance of 5 cm from A. Find the magnification of final image

asked Feb 12, 2014 by meena.p

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A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius 2a and outer radius as shown in figure . Find the amount of heat produced when switch is closed

asked Feb 12, 2014 by yamini.v

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The colligative properties depend upon

asked Feb 12, 2014 by sreemathi.v

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Which one of the following is considered as colligative property?

asked Feb 12, 2014 by sreemathi.v

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A glass convex lens of refractive index $\large\frac{3}{2}$ has got a focal length equal to $50 \;cm$ Find the focal length of lens if it is immersed in ethyl alcohol of $refractive index \;1.36$

asked Feb 12, 2014 by meena.p

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How many moles of water are present in 90g of water?

asked Feb 12, 2014 by sreemathi.v

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Calculate the amount of ammonium sulphate required to prepare 500ml of 1 molar solution of ammonium sulphate? (m.wt of $(NH_4)_2SO_4$ is 132.14gm/mol)

asked Feb 12, 2014 by sreemathi.v

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A parallel beam of light travelling in water $(\mu =\large\frac{4}{3})$ is refracted through a spherical air bubble of radius R .. Find the location of image formed after refraction at two surfaces.

asked Feb 12, 2014 by meena.p

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If the molar mass of glucose is 180.2 g mol$^{-1}$ and if 36 gm of glucose $C_6H_{12}O_6$ is present in 1000 gm of an aqueous solution of glucose,it is said to be

asked Feb 12, 2014 by sreemathi.v

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Six charges are placed at the certices of a regular hexagon as shown in the figure . The electric field on the line passing through point O and perpendicular to the plane of the figure as a function of distance x from point O is $\;(x > > a)$

asked Feb 12, 2014 by yamini.v

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One molal solution indicates

asked Feb 12, 2014 by sreemathi.v

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A prism of crown glass refracting angle of $50^{\circ}$ and mean refractive index $=1.51$ is combined with one flint glass prism of refractive index $=1.65$ to produce no deviation Then the angle of flint glass is

asked Feb 12, 2014 by meena.p

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Solubility of a substance in a solvent depends upon

asked Feb 12, 2014 by sreemathi.v

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Two point charges a and b whose magnitudes are same positioned at a certain distance along the positive x-axis from each other . a is at origin and b is at a distance $\;x_{0}\;$ from a . Graph is drawn between electrical field strength and distance x from a . E is taken positive if it is along the line joining from a to b . Then

asked Feb 12, 2014 by yamini.v

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How much mass of urea $(NH_2CONH_2)$ is required in preparing 5 kg of 0.50 molal solution? (M.wt of urea=60g)

asked Feb 12, 2014 by sreemathi.v

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If 50ml of 0.5M $H_2SO_4$ is diluted to 1000 ml, what is the molarity of diluted solution?

asked Feb 12, 2014 by sreemathi.v

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What is the molarity of solution, if 60g of $Co(NO_3)_2.6H_2O$ dissolved in 4.3L of solution ?

asked Feb 12, 2014 by sreemathi.v

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What is the mole fraction of benzene in solution containing 20% by mass in $CCl_4$?

asked Feb 12, 2014 by sreemathi.v

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The dispersive power of crown and flint glasses are 0.03 and 0.05 respectively . If difference in refractive indices of blue and red colours is 0.014 for crown glass and 0.023 for flint glass . Then the angle of two prisms for a deviation of $10^{\circ}$ (with out dispersion )

asked Feb 12, 2014 by meena.p

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What is mass percentage of benzene $(C_6H_6)$ in carbon tetrachloride $(CCl_4)$ if 20g of benzene is dissolved in 180g of $CCl_4$?

asked Feb 12, 2014 by sreemathi.v

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