Recent questions tagged q86

Find the magnitude of the magnetic field at the origin O due to a very long conductor carrying current I of the shape .

asked Aug 3, 2015 by meena.p

1 answer

A compass needle whose magnetic moment is $60Am^2$ pointing geographic north at a certain place, Where the horizontal component of earth's magnetic field is $40 \mu wbm^{-2}$ experiences a torque $1.2 \times 10^{-3}\;Nm$ What is the declination of the place?

asked Jul 21, 2015 by meena.p

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Given resistance of $1 \Omega, 2 \Omega$ and $3 \Omega$ how will we combined them to get an equivalent resistance of $6 \Omega$

asked Jul 3, 2015 by meena.p

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The dimensions of an atom of the order of an angstrom. Thus there must be large electric fields between the protons and electron . Why then is the electrostatic field inside a conductor zero?

asked Apr 29, 2015 by meena.p

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The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecules is

asked Apr 7, 2014 by sreemathi.v

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Figure shows a capacitor made of two circular plates each of radius $12\: cm$, and separated by $5\: cm$. The capacitor is being charged by an external source. The charging current is constant and equal to $0.15\: A$. The rate of change in potential difference between the plates is

asked Apr 3, 2014 by balaji.thirumalai

1 answer

Which of the following vitamin is water soluble?

asked Mar 30, 2014 by thanvigandhi_1

1 answer

Integrate : $\int \large\frac{ax^3+bx+c}{\sqrt x}$$dx$

asked Mar 26, 2014 by balaji.thirumalai

1 answer

A monatomic ideal gas at temperature $ T_1$ is enclosed in a cylinder with frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing piston suddenly. If $L_1$ and $L_2$ are lengths of gas columns before and after expansion, then

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Van arkel method is generally used for

asked Mar 20, 2014 by meena.p

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Which of the following is is a polyamide?

asked Mar 12, 2014 by thanvigandhi_1

1 answer

An ornament of Gold having $77.5%$ of Gold is of _____ carat.

asked Mar 12, 2014 by meena.p

1 answer

hypervalent compound is

asked Mar 7, 2014 by sreemathi.v

1 answer

The order of decreasing stability of the carbanions $(CH_3)_3 C^-(I) ; (CH_3)_2CH^{-1}(II) ; CH_3CH_2^{-}(III); C_6H_5CH_2^{-} (IV)$ is

asked Feb 26, 2014 by meena.p

1 answer

A chiral $C_5H_{10}O$ ether reacts with hot $HI$ to give a $C_5H_{10}I_2$ product.Treatment of this with hot $KOH$ in ethanol produces $1$,$3$-pentadiene.What is the structure of the original ether?

asked Feb 25, 2014 by sreemathi.v

1 answer

1.26gm weight of NaOH required to be added in R.H.S to consume all the $H^+$ present in R.H.S of cell of emf to .701V at $25^{\large\circ}C$.Given: $Zn/Zn^{+2}(0.1M)\parallel HCl$(1litre)$/H_2/$(1atm)/P:-$E^0_{Zn/Zn^{+2}}=0.7602$.The emf of cell after addition of NaOH will be

asked Feb 18, 2014 by sreemathi.v

1 answer

Which of the following has the maximum osmotic at temperature T?

asked Feb 14, 2014 by sreemathi.v

1 answer

Find the equation of director circle for ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?

asked Feb 7, 2014 by sreemathi.v

1 answer

Find all values of m for which $y-e^{mx}$ is solution of equation $y'''-2y''-y'+2y=0$

asked Feb 7, 2014 by meena.p

1 answer

The standard deviation of the numbers 31, 32, 33, 46, 47 is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Using law of Boolean Algebra the value of $A+(\bar {A}B)$

asked Jan 31, 2014 by meena.p

1 answer

Portland cement does not contain :

asked Jan 28, 2014 by sreemathi.v

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In alkaline medium $H_2O_2$ reacts with $Fe^{3+}$ and $Mn^{2+}$ separately to give

asked Jan 24, 2014 by sreemathi.v

1 answer

$xNO_2+yH_2O+O_2\rightarrow 4z$.The sum of $x+y=$

asked Jan 22, 2014 by sreemathi.v

1 answer

The sum of three decreasing numbers in AP is 27. If -1, -1, and 3 are added to them respectively the resulting series is in GP. The numbers are

asked Jan 17, 2014 by yamini.v

1 answer

Calculate the velocity of an electron placed in $III$ orbit of H atom.Also calculate the no of revolution /sec round the nucleus.

asked Jan 15, 2014 by sreemathi.v

1 answer

The angle between the lines $x=1,\:y=2$ and $y=-1,\:z=0$ is ?

asked Jan 9, 2014 by rvidyagovindarajan_1

1 answer

$f(x)=\left\{\begin{array}{1 1}\large\frac{x^5-32}{x-2}&x\neq 2\\k&x=2\end{array}\right.$ is continuous at $x=2$ then $k=$

asked Dec 30, 2013 by sreemathi.v

1 answer

Green chemistry means such reactions which :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Blood glands of Pheretima are located in which segments ?

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $|\overrightarrow a|=|\overrightarrow c|=1, \:|\overrightarrow b|=4,\:\overrightarrow a\times\overrightarrow b=2\overrightarrow a\times\overrightarrow c\:and\:$ if the angle between $\overrightarrow b\:and\:\:\overrightarrow c$ is $cos^{-1}\large\frac{1}{4}$ then $\overrightarrow b-2\overrightarrow c=?$

asked Dec 7, 2013 by rvidyagovindarajan_1

1 answer

The dorsal side of the skin of Pheretima is brown due to blood glands in

asked Dec 5, 2013 by thanvigandhi_1

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Which of the following is anhydride of $HNO_3$?

asked Nov 29, 2013 by sreemathi.v

1 answer

The $pH$ value of gastric juice in human stomach is about 1.8 and in the small intestine it is about 7.8. The $pK_a$ value of aspirin is 3.5. Aspirin will be

asked Nov 27, 2013 by mosymeow_1

1 answer

The narrow middle part of the chromatophore in Euglena is :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

A sphere of mass m moving with constant velocity hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of velocities of the two spheres after the collision will be :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A thin bi-convex lens of focal length 20 cm is made of glass of refractive index 1.5, when it is dipped in a liquid of refractive index $ \large\frac{9}{8} $, it acts as :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

The density (in $gml^{-1})$ of a 3.60M sulphuric acid solution that is 29% $H_2SO_4$ (Molar mass=$98gmol^{-1})$ by mass will be :

asked Oct 30, 2013 by sreemathi.v

1 answer

A ball is thrown vertically upwards from the top of a tower. Velocity at a point 'h' m vertically below the point of projection is twice the download velocity at a point 'h' m vertically above the point of projection. The maximum height reached by the ball above the top of the tower is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

A ball is dropped from a height 'h' on a floor of coefficient of restitution 'e'. The total distance covered by the ball just before second hit is

asked Oct 18, 2013 by meena.p

1 answer

If $a=\sin^{-1}\big(\large\frac{-1}{\sqrt 2}\big)+$$\cos^{-1}\big(\large\frac{-1}{2}\big),$$b=\tan^{-1}\big(-\sqrt 3\big)-\cot^{-1}\big(-\large\frac{1}{\sqrt 3}\big)$ then

asked Oct 11, 2013 by sreemathi.v

1 answer

A particle of mass 4 m explodes into three pieces of masses $m, m $ and $2m$. The equal masses move along X and Y axes with velocities $4 ms^{-1}$ and $6\;ms^{-1}$ respectively. The magnitude of the velocity of the heavier mass is :

asked Oct 11, 2013 by meena.p

1 answer

A bar magnet of moment of inertia I is vibrated in a magnetic field of induction $0.4 \times 10^{-4}T$ . The time period of vibration is 12 sec. The magnetic moment of the magnet is 120$Am^2$ . The moment of inertia of the magnet is ( in $kgm^2$) approximately

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A bady of mass $M_1=4 kg$ moves at $ 5 \hat i$ m/s and another body of mass $m_2=2 kg$ moves at $10 \hat i$m/s. The kinetic energy of center of mass is :

asked Sep 30, 2013 by meena.p

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A certain vector in the $xy$ plane has an $x$ component of 4 m and any component of 10 m. It is then rotated in the $xy$ plane so that its $x-$ component is doubled. Then its new y component is (approximately):

asked Sep 23, 2013 by meena.p

1 answer

Two bodies of mass 4 kg and 5 kg are moving along east and north directions with velocities 5 m/s and 3 m/s respectively. Magnitude of the velocity of center of mass of the system is

asked Sep 17, 2013 by meena.p

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