Recent questions tagged q81

A uniform conducting wire of length $12a$ and resistance R is wound up as a current carrying coil in the shape of an equilateral a regular hexagon of side a .The coil is connected to a voltage source of $V_0$ Find the magnetic moment of the coil .

asked Jul 31, 2015 by meena.p

1 answer

Why do magnetic lines of force prefer to pass through ferromagnetic substance than through air ?

asked Jul 21, 2015 by meena.p

1 answer

Given n resistor each resistance R, how will you combine them to get the maximum effective resistance ?

asked Jul 3, 2015 by meena.p

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It is believed that protons and neutrons (which constitute nucli of or ordinary matter) are themseleves built out of more elementary units called quarks. A proton and a neutron consists of there quarks each. Two type of quarks, the so called 'up' quark (denoted by u) of charge $+\bigg( \large\frac{2}{3}$$e\bigg)$ and the down quark denoted by of charge $\bigg( \large\frac{-1}{3}$$e\bigg)$, together with electricity build up an ordinary matter. (quarks of other types have also been found which give rise to different ususual varieties of matter. ). Suggest a possible quark composition of a proton and neutron .

asked Apr 29, 2015 by meena.p

1 answer

Consider the basic strength of amines in aqueous solution,which one has the smallest $pK_b$ value?

asked Apr 7, 2014 by sreemathi.v

1 answer

During the process of digestion the proteins presenting the food material are hydrolysed to amino acids. The two enzymes involved in the process of Amino acids are respectively

asked Mar 30, 2014 by thanvigandhi_1

1 answer

The froth stabilizers, generally used during froth-floatation

asked Mar 20, 2014 by meena.p

1 answer

Compute the heat of formation of liquid methanol in kilojoules per mole, using the given data: \[\] $ \Delta H_{vap}$ of liquid methanol $= -38\: kJ/mol, \Delta H_f^{\circ}\: of\: H(g), C(g), O(g)$ respectively are $218, 715\: and\: 247\: kJ/mol$. Also, $ \Delta H_{C-H}, \Delta H_{C-O}, \Delta H_{O-H}$ being $415, 356, 463 \: kJ/mol$ respectively.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

On controlled hydrolysis and condensation $R_3\: SiCl$ yields

asked Mar 12, 2014 by thanvigandhi_1

1 answer

The formulae of Mohr salt is

asked Mar 12, 2014 by meena.p

1 answer

Which of the following is the correct order for the strength of hydrogen bonding

asked Mar 7, 2014 by sreemathi.v

1 answer

Which of the following compounds possesses the $C-H$ bond with the lowest bond dissocation energy :

asked Feb 26, 2014 by meena.p

1 answer

What are the resulting products of the reaction below?

asked Feb 25, 2014 by sreemathi.v

1 answer

Calculate EMF of concentration cell consisting of zinc electrodes,one immersed in a solution of 0.01M $Zn^{+2}$ ions and the other in a solution of 0.1M $Zn^{+2}$ ions at $25^{\large\circ}C$.The two solution are separated by a salt bridge

asked Feb 18, 2014 by sreemathi.v

1 answer

Most likely the following mixtures to be an ideal solution is

asked Feb 14, 2014 by sreemathi.v

1 answer

Find the equation of the ellipse referred to its centre whose minor axis is equal to the distance between the foci and whose latus is 10?

asked Feb 7, 2014 by sreemathi.v

2 answers

Solve : $\log \bigg(\large\frac{1}{x}.\frac{dy}{dx}\bigg)$$=2x+5y$

asked Feb 7, 2014 by meena.p

1 answer

If the 0 and 1 are inputs for a NAND gate what would be the output?

asked Jan 30, 2014 by meena.p

1 answer

If 25% of item are less than 10 and 25% are more than 40, then coefficient of quartile deviation is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

Which among the compounds of alkali metals undergo hydrolysis

asked Jan 28, 2014 by sreemathi.v

1 answer

$Cu+H_2\quad\underrightarrow {heat}\quad Cu+x$,$ZnO+y\quad\underrightarrow{heat} \quad Zn+H_2O$,$2AgCl+H_2\rightarrow z+w$.The $w$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$NO_2$ combines with atmospheric moisture to form mixture of $2NO_2+H_2O\rightarrow y + HNO_3$.The y is

asked Jan 21, 2014 by sreemathi.v

1 answer

The sum of n terms of the infinite series $1.3^2$+$2.5^2$+$3.7^2$+-------$\infty$ is given by

asked Jan 17, 2014 by yamini.v

1 answer

The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom

asked Jan 15, 2014 by sreemathi.v

1 answer

The equation of the plane that meets the coordinate axes at the points $A,B,C$ respectively and the centroid of the $\Delta\:ABC$ is $(2,1,5)$ is ?

asked Jan 7, 2014 by rvidyagovindarajan_1

1 answer

If $\log (x+y)=2xy$ then $y'(0)=$

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \sin ^2 x \cos ^2 x \;dx$

asked Dec 18, 2013 by meena.p

1 answer

The angular shape of ozone molecule $(O_3)$ consist of :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The scientific name of the lung fluke of man is :

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow d=x(\overrightarrow a \times\overrightarrow b)+y(\overrightarrow b\times\overrightarrow c)+z(\overrightarrow c\times\overrightarrow a)$ and $[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]=\large\frac{1}{8}$, then $x+y+z=?$

asked Dec 6, 2013 by rvidyagovindarajan_1

1 answer

Termites cannot digest cellulose of wood in the absence of

asked Dec 5, 2013 by thanvigandhi_1

0 answers

The oxidation number of sulphur in $S_8$

asked Nov 29, 2013 by sreemathi.v

1 answer

To prepare a buffer of $pH$ 8.26 amount of $(NH_4)_2SO_4$ to be added into 50 mL of 0.01 M $NH_4OH$ solution is [$pK_a (NH_4^+)$ = 9.26]

asked Nov 27, 2013 by mosymeow_1

1 answer

Budding in protozoa is seen in :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

A body weight 22.42 gm and has a measured volume of 4.7 cc. The possible error in the measurement of mass and volume are 0.01 gm and 0.1 cc. Then the maximum error percentage in the density will be :

asked Nov 15, 2013 by thanvigandhi_1

1 answer

Two cylinders A and B, fitted with pistons. A and B contain equal moles of an ideal monoatomic gas at 400 K. Piston in A is free to move, while piston in B is held fixed. Same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 42 K, then the increase in the temperature of the gas in B is $ \bigg( \gamma = \large\frac{5}{3} \bigg) $:

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Two solution of a substance (non-electrolyte) are mixed in the following manner,480ml of 0.5M of first solution with 520 ml of 1.2m of second solution.The molarity of final solution is

asked Oct 29, 2013 by sreemathi.v

1 answer

Three chargers Q, + q and + q are placed at the vertices of a right angle triangle ( isoceles triangle ) as shown . If the net electrostatic potential energy of the configuration is zero, value of Q is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

The energy (E), angular momentum (L) and universal gravitational constant(G) are chosen as fundamental quantities. The dimensions of universal gravitational constant in the dimensional formula of Planks constant (h) is

asked Oct 18, 2013 by meena.p

1 answer

The principal value of $\sin^{-1}\tan\big(\large\frac{-5\pi}{4}\big)$ is

asked Oct 11, 2013 by sreemathi.v

1 answer

When a wave traverses a medium , the displacement of a particle located at $'x'$ at a time $'t'$ is given by $y=a \sin (bt-cx), where a,b and c are constants of the wave, which of the following is a quantity with dimensions?

asked Oct 11, 2013 by meena.p

1 answer

A wire of length 'L' and linear density 'm' is stretched by a force 'T' and the frequency is $n_1$. Another wire of the same material of length 2L and same linear density is stretched by a force 9T and its frequency is $n_2$ . Value of $(n_2 / n_1 )$ is,

asked Oct 8, 2013 by thanvigandhi_1

1 answer

If the force is given by $F= at +bt^2$ with t as time. The dimensions of a and b are :

asked Sep 29, 2013 by meena.p

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