Recent questions tagged question-paper-2

Amount of oxalic and present in a solution can be determined by its nitration with $kM_nO_4$ solution in the presence of $H_2SO_4$ . The nitration gives unsatisfactory result when carried out in the presence of Hcl because Hcl

asked Oct 4, 2018 by meena.p

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Two fixed friction less inclined plane making $30^{\circ}$ and $60^{\circ}$ with vertical are shown . Two blocks A and B are placed on the two planes . What is the relative vertical acceleration of a with respect to B.

asked May 13, 2015 by meena.p

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The time period of oscillation of a uniform rod with length l pivoted at one end is

asked May 13, 2015 by meena.p

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A jet of air moving with a speed of $50\;m/s$ with diameter $10\;mm$ strikes a disc kept vertical what is the force exerted by the air jet on the disc. (density of air $1.03\;kg/m^3)$

asked May 13, 2015 by meena.p

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If the radius of earth were increased by a factor of 2 keeping mass constant , by what factor would its density have to be changed to keep of the same .

asked May 12, 2015 by meena.p

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The coordinates of center of mass of uniform lamina shown in figure is

asked May 12, 2015 by meena.p

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A block of mass m is connected to a spring and passed over a pulley as shown in figure. The block is released from rest with the spring outstretched. Force constant of spring is k. Find the maximum extension in the spring .

asked May 12, 2015 by meena.p

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A object A is at a point $x=3\;m$ and $y= 1.25 \;m$ from a fixed point. At time $t=0$ the object starts moving with an acceleration of $1.5 \;m/s^2$ in the +ve x direction . At the same instant a stone is projected from origin with a velocity $\overrightarrow{u}$ and hits the object during its downward motions at an angle of $45^{\circ}$ to the horizontal. Find the time after which the store hots the object $[g= 10\;m/s^2]$

asked May 12, 2015 by meena.p

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One end of a copper rod of length 1 m and cross sectional area $4.0 \times 10^{-4} m^2$ is maintained at $100^{\circ}C$ At the other end of the ice is kept at $0^{\circ}C$.Neglecting loss of heat from surrounding the mass of ice melted in half hour is $[ K_{cu}=401 \;w/m k\;and\;L_f =3.35 \times 10^5 \;J/kg]$

asked May 12, 2015 by meena.p

1 answer

Two cars A and b are travelling in same direction with velocities $V_1$ and $V_2 (V_1 > V_2)$ when the car A is at a distance d ahead of car B , the driver of the car A applied the broke producing a uniform retardation a. There will be no collision when

asked May 12, 2015 by meena.p

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Two short magnets P and Q are arranged such that centres are on the x- axis and are separated by large distance the magnetic axis of P and Q are along X and Y axes respectively. At a point $R_1$ mid way between their centers , the magnitude of total induction at R due to both magnet is $ (if B is magnitude of induction due to a)

asked May 12, 2015 by meena.p

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A photo diode is made from a semiconductor with band gap of $2/5 \;eV$ , which of the following ranges of wavelength it can detected ?

asked May 12, 2015 by meena.p

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Two white point dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately what is the maximum distanceat which thes dots can be resolved by the eye (wave length of light = 500 nm)

asked May 12, 2015 by meena.p

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A prism is made of material of refractive index $\sqrt 3$. The angle of minimum derivation is equal to angle of prism, then the angle of prism is .

asked May 11, 2015 by meena.p

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Separation between plates of a parallel plate capacitors is 'd'. It is charged a battery then disconnected ,a dielectric slab of thickness $\large\frac{d}{3}$ and constant 3 is introduced in it . The fractional change in energy .

asked May 11, 2015 by meena.p

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If a photo cell is illuminated with a radiation of $1240 \;A^{\circ}$, the stopping potential is found to be $6V$ , then the work function of the emitter and the threshold wavelength are

asked May 11, 2015 by meena.p

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The magnetic field at O

asked May 11, 2015 by meena.p

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The lubricating action of an oil is more if it possess

asked Apr 9, 2015 by meena.p

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The compound that is most reactive towards electrophilic nitration is

asked Apr 9, 2015 by meena.p

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According to bothr's theory , the angular momentum of an electron in 5th orbit is

asked Apr 9, 2015 by meena.p

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A burning strip of magnesium is introduced into a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is

asked Apr 9, 2015 by meena.p

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The amount of heat released during the reaction of $300 \;mL$ of $1M\;HCl$ with $100\;mL$ of $1M\;NaOH$ is

asked Apr 9, 2015 by meena.p

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In context with the industrial preparation of hydrogen water gas $(CO+H_2)$, Which of the following is the correct statement ?

asked Apr 9, 2015 by meena.p

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When an electric current of $0.5\;ampere$ passed through acidulated water for two hours then volume of hydrogen $(H_2)$ at $NTP$ produced at cathode will be.

asked Apr 9, 2015 by meena.p

1 answer

Which one of the following pair of species have the same bond order ?

asked Apr 9, 2015 by meena.p

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In the gaseous phase reaction : $A_2(g) \to B(g) +\bigg( \large\frac{1}{2}$$C(g)$ the increase in pressure from 100 mm to 120 mm is noticed in 5 minute. The rate of disappearance of $A_2$ in mm $min^{-1}$ is

asked Apr 9, 2015 by meena.p

1 answer

The organic chloro compound , Which shows completed stereo chemical inversion during $SN_2$ reaction is

asked Apr 9, 2015 by meena.p

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The ionization enthalpy of hydrogen atom is $ 1.312 \times 10^6\;J\;mol^{-1}$. The energy required to exit the electron in the atom from $n=1\;to \;n=2$ is

asked Apr 9, 2015 by meena.p

1 answer

Phenol, When it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives,

asked Apr 9, 2015 by meena.p

1 answer

A buffer solution has equal volume of $0.2\;M,NH_4OH$ and $0.02 \;MNH_4 Cl$. The Pkb of the base is 5. the $PH$ is

asked Apr 8, 2015 by meena.p

1 answer

Which one is reversible process : -

asked Apr 8, 2015 by meena.p

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Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?

asked Apr 8, 2015 by meena.p

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Which of the following factors is of no significance for roasting sulfide oxe to the oxides and not subjecting the sulfide are to carbon reduction directly ?

asked Apr 8, 2015 by meena.p

1 answer

Mortar is a mixture of

asked Apr 8, 2015 by meena.p

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The solubility of carbonates decrease down the omagnesium group due to decrease in

asked Apr 8, 2015 by meena.p

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Sodium amalgam is used as

asked Apr 8, 2015 by meena.p

1 answer

The treatment of $CH_3Mgx$ with $CH_3 C \equiv C-H$ produce

asked Apr 8, 2015 by meena.p

1 answer

The formation of the oxide ion $0^{2-} (g)$ requires first on exothermic and then an endothermic step. $O_{(g)} +e^- \to O^{-} _{(g)}; \Delta r^{\circ} =-142\;kj mol^{-1}$$O_{(g)} +e^- \to O^{2-}_{(g)}; \Delta r^{\circ} =+844\;kj mol^{-1}$This is because of

asked Apr 8, 2015 by meena.p

1 answer

With increase in temperature , which of these changes?

asked Apr 8, 2015 by meena.p

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In the castner's process for the extraction of sodium , the anode is made of ________ metal.

asked Apr 8, 2015 by meena.p

1 answer

In organic reactions, sodium in liquid ammonia is used as

asked Apr 8, 2015 by meena.p

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Which is the oxidation number of cr in $K_2Cr_2O_7$?

asked Apr 8, 2015 by meena.p

1 answer

Amount of oxalic and present in a solution can be determined by its nitration with $kM_nO_4$ solution in the presence of $H_2SO_4$ . The nitration gives unsatisfactory result when carried out in the presence of Hcl because Hcl

asked Apr 8, 2015 by meena.p

1 answer

The first order reaction is $20 \%$ complete in 10 minutes. calculate the time taken for the reaction to go to $80\%$ completion

asked Apr 8, 2015 by meena.p

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The $pKa$ of a weak acid, $HA$ is $4.80$ . The $pKb$ of a weak base BOH is $4.78$. The PH of an aqueous solution of the corresponding salt, BA will be

asked Apr 8, 2015 by meena.p

1 answer

The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

asked Apr 8, 2015 by meena.p

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A gas expands by $0.5$ liter against a constant pressure of one atmosphere . Calculate the work done in joule.

asked Apr 8, 2015 by meena.p

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What is the ratio between the energies of two radiations one with a wave lebgth of $6000A^{\circ}$ and other with $2000 A^{\circ}$?

asked Apr 8, 2015 by meena.p

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Let $0 < P(A) <1$$,0< P(B) <1$ and $P(A \cup B) =P(A) +P(B) - P(A).P(B)$ Then

asked Mar 9, 2015 by meena.p

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The function $f(x) = max \{(1-x),(1+x),2\} x \in (- \infty , \infty)$ , is

asked Mar 9, 2015 by meena.p

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