Recent questions tagged q93

A conductor of length $2\;m$ carrying current of $2\;A$ is held parallel to an infinitely long conductor carrying current of $10\;A$ at a distance of $100\;mm$ . Find the force on small conductor .

asked Aug 4, 2015 by meena.p

1 answer

A freely suspended magnet at equator will set itself _________ to the surface of earth

asked Jul 22, 2015 by meena.p

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Three charges $+q, 2q$ and $-4 q$ are placed on the three vertices of an equilateral triangle of each side $0.1\;m$ calculate electrostatic potential energy of the system , take $q= 10^{-7} \;c$

asked Jul 8, 2015 by meena.p

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Potential energy of an electric dipole at an angle $\theta$ in a uniform electric field is zero when $\theta= ?$

asked Jul 8, 2015 by meena.p

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Two batteries of emf $e_1$ and $e_2(e_2 > e_1)$ and internal resistance $r_1$ and $r_2$ respectively are connected in parallel as shown in the figure

asked Jul 7, 2015 by meena.p

1 answer

The segment of DNA which acts as the instrumental manual for the synthesis of protein is

asked Mar 31, 2014 by thanvigandhi_1

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S1: Reversible process and cyclic process have same meaning. \[\] S2: $\Delta H_{cycle}$ and $\Delta E_{cycle}$ is zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

In the electrolysis of brine for the production of chlorine , the by products are

asked Mar 20, 2014 by meena.p

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$AgCl$ precipitate dissolves in $NH_3$ due to the formation of

asked Mar 13, 2014 by meena.p

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Glyptal polymer is obtained by treating glycerol with

asked Mar 12, 2014 by thanvigandhi_1

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The change in hybridisation of the Al atom in the reaction of $AlCl_3+Cl^-\rightarrow AlCl_4^-$

asked Mar 7, 2014 by sreemathi.v

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Which of the following organic compound shows Keto–enol tautomerism?

asked Feb 27, 2014 by meena.p

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Ketanol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol. The enol and keto fprms are said to be tatutomers of each other. The interconversion of the two forms involved the movements of a proton and the shifting of bonding electrons. A compound containing a carbonyl group $(C=0)$ is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl $(-OH)$ group, $C=C-OH$ For a carbonyl compound to exhibit tautomerism, the essential condition is that, it must have at least one $ \alpha -H$ atom. Generally , the keto form is more stable than the enol form due to the greater strength of the carbon- oxygen $\pi$ bond as compared - carbon $\pi$ bond. Keto- enol tatutomerism is observed in

asked Feb 26, 2014 by meena.p

1 answer

Which carboxylic acid will show HVZ reaction?

asked Feb 25, 2014 by sreemathi.v

1 answer

For the following disproportion reaction $3Br_2+6OH^{-}\rightarrow 5Br^-+BrO_3^-+3H_2O$. Correct statement below is (Given $Br_2$ molecular mass is 160)

asked Feb 14, 2014 by sreemathi.v

1 answer

Find solution of differential equation $(y-x+1) dy -(y+x+2)dx=0$

asked Feb 7, 2014 by meena.p

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If the angle between the straight line joining foci and the ends of the minor axis of the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ is $90^{\large\circ}$ .Find its eccentricity?

asked Feb 7, 2014 by sreemathi.v

1 answer

Karl - Pearson's coefficient of Skewness of a distribution is $0.4$ If SD is 6 and mean 40, then median of the distribution is

asked Feb 1, 2014 by thanvigandhi_1

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To obtains p-type germanium semiconductor it must be doped with

asked Jan 31, 2014 by meena.p

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Alkaline earth metal sulphates which crystallises in hydrated form are

asked Jan 29, 2014 by sreemathi.v

1 answer

$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$.The $z$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$x(CH_2O)\rightarrow CO_2+CH_4$.The $x$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

The sum of 0.2, 0.22, 0.222, 0.2222.....till n terms is given by

asked Jan 18, 2014 by yamini.v

2 answers

Estimate the difference in energy between first and second Bohr's orbit for a H atom.At what minimum atomic no a transition from $n=2$ to $n=1$ energy level would result in the emission of $X$-rays with $\lambda=3\times 10^8m$ ?which hydrogen atom like species does this atomic no corresponds to ?

asked Jan 15, 2014 by sreemathi.v

1 answer

The projection of a line segment on $x,y,z$ axes are $12,\:4,\:3$ respectively, then the length of the line segment is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

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$\lim\limits_{x\to {-1}}\large\frac{\sqrt{\pi}-\sqrt{\cos^{-1}x}}{\sqrt{x+1}}$ is given by

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \large\frac{8}{9} \frac{x}{\sqrt {1-x^4}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

In DNA, the complimentary bases are :

asked Dec 18, 2013 by thanvigandhi_1

0 answers

When locomotory speed of animal I. influenced by light rays, the response is known as :

asked Dec 11, 2013 by thanvigandhi_1

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If $\overrightarrow {AB}=3\hat i-2\hat j+2\hat k$ and $\overrightarrow {BC}=-\hat i-2\hat k$ are adjacent sides of a parallelogram, then the angle between the diagonals is ?

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

The number of moults that the caterpillar of Bombix mori undergoes

asked Dec 5, 2013 by thanvigandhi_1

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Flurosis disease is caused due to the reaction of __________with excess of fluride in the body

asked Nov 29, 2013 by sreemathi.v

1 answer

For a concentrated solution of a weak electrolytic $A_xB_y$ of concentration C, the degree of dissociation $\alpha$ is given by

asked Nov 27, 2013 by mosymeow_1

1 answer

An annelid in which internal fertilization occurs is :

asked Nov 27, 2013 by thanvigandhi_1

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A 4.0 m long copper wire of cross sectional area $ 1.2 \: cm^2$ is stretched by a force of $ 4.8 \times 10^3N$ If Young's modulus for copper is $ Y = 1.2 \times 10^{11}\: N/m^2$ , the increase in length of wire and strain energy stored per unit volume are :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

If $\tan^{-1}\big(\large\frac{a}{x}\big)$$+\tan^{-1}\big(\large\frac{b}{x}\big)=\frac{\pi}{2}$ then $x$ is equal to

asked Nov 15, 2013 by sreemathi.v

1 answer

The acceleration of 3 kg mass in figure shown is ( assume $g = 10 m/s^2 )$ :

asked Nov 1, 2013 by thanvigandhi_1

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Pottassium selenate is isomorphous with potassium sulphate and contains 45.42% selenium by weight.Calculate the atomic weight of selenium.Also report the equivalent weight of potassium selenate.

asked Oct 31, 2013 by sreemathi.v

1 answer

Two horizontal circular discs of different radii are free to rotate about their central axes. One disc is given some angular velocity and the other is stationary. Their rims are now brought in contact. Their is friction between the rims. Correct statement from the following is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

A load of 1 kg weight is attached to one of a steel wire of area of cross- section $3\; mm ^2$ and young's modulus $10^{11}\;Nm^2$. The other end is suspended vertically from a book on a wall, then the load is pulled horizontally and released. When the load passes through its lowest position the fractional change in length is $(g= 10 m/sec^2)$

asked Oct 18, 2013 by meena.p

1 answer

A piece of metal weights 45 gms in air and 25 gms in a liquid of density $1.5 \times 10^3kg-m^{-3}$ kept at $30^{\circ}C. $ When the temperature of the liquid of density $1.5 \times 10^3\;kg-m^{-3}$ kept at $30^{\circ}C$. When the temperature of the liquid is raised to $40^{\circ}$, the metal piece weight 27 gms. The density of liquid at $40^{\circ}C$ is $1.25 \times 10^3\;kg-m^{-3}.$ The coefficient of linear expansion of metal is :

asked Oct 11, 2013 by meena.p

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A body is thrown vertically upward from a point 'A' 125 m above the ground. It goes up to a maximum height of 250 m above the ground and passes through 'A' on its downward journey. The velocity of the body when it is at a height of 70 m above the ground is$ ( g = 10 \: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Match the following:

asked Sep 30, 2013 by meena.p

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Two uniform circular discs having the same mass and the same thickness but different radii are made from different materials. The disc with the smaller rotational inertia is:

asked Sep 24, 2013 by meena.p

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A tension of $20 \;N$ is applied to a copper wire of cross sectional area $0.01\;cm^2$, Young's Modulus of copper is $1.1 \times 10^{11} \;N/m^2$ and Poisson's ratio is $0.32$. The decrease in cross sectional area of the wire is

asked Sep 17, 2013 by meena.p

1 answer

The radius of planet is R. A satellite revolves around it in a circular orbit of radius r with angular speed 'w'. The acceleration due to gravity on the planet's surface will be

asked Aug 29, 2013 by meena.p

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