Recent questions tagged q91

A change q moving along the x- axis with a velocity $\overrightarrow{v}$ is subjected to a uniform magnetic field B acting along the z -axis as it crosses the origin as shown in the figure. (i) Trace the trajectory (ii) Does the change gain kinetic as it enters the magnetic field ?

asked Aug 4, 2015 by meena.p

1 answer

A short bar magnet is placed with its north pole pointing south . The natural point is $15\;cm$ away from the center of the magnet. If $H= 0.5 \;G$, Calculate the magnetic moment of the magnet.

asked Jul 22, 2015 by meena.p

1 answer

In the figure two positive charges $q_2$ and $q_3$ fixed along the y-axis , exert a net electric force in the $+x$ direction on a change $q_1$ fixed along the x-axis . If a positive charge Q is added at $(x,0)$, then the force on $q_1$

asked Jul 8, 2015 by meena.p

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Consider circuit in the given figure. How much energy is absorbed by electron from the initial state of no current (ignore thermal motion ) to the state of drift velocity ?

asked Jul 7, 2015 by meena.p

1 answer

The number of disulphide linkages present in insulin are

asked Mar 31, 2014 by thanvigandhi_1

1 answer

Which among the following is/are endothermic reaction(s)? \[\] (1) Combustion of methane \[\] (2) Decomposition of water \[\] (3) Dehydrogenation of ethane to ethane \[\] (4) Conversion of graphite to diamond

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Small pipes, called tuyeres, are kept at the sides of blast furnace from where

asked Mar 20, 2014 by meena.p

1 answer

Chemically philospher's wool is :

asked Mar 13, 2014 by meena.p

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Which persentage of sulphur is used in the vulcanisation ofrubber?

asked Mar 12, 2014 by thanvigandhi_1

1 answer

Hybridisation and geometry of $XeO_4$ is

asked Mar 7, 2014 by sreemathi.v

1 answer

Propionic acid $\quad \underrightarrow{PCl_3}\quad X\quad\underrightarrow{C_6H_6}\quad Y$.In this sequence Y is

asked Feb 25, 2014 by sreemathi.v

1 answer

$PtCl_4.6H_2O$ can exist as a hydrated complex. If 1 molal aqueos solution has a depression in freezing point of $3.72^{\large\circ}$,assuming 100% ionization and $K_f$ of $1.86^{\large\circ}mol^{-1}kg$ which of the following is the complex in question?

asked Feb 14, 2014 by sreemathi.v

1 answer

Eliminate arbitrary constant and obtain differential equation $x^2-y^2= a(x^2+y^2)^2$

asked Feb 7, 2014 by meena.p

1 answer

The length of the major axis of the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ is 2 times the length of minor axis its eccentricity is :

asked Feb 7, 2014 by sreemathi.v

1 answer

The value of covariance of two variable $x$ and $y$ is $- \large\frac{148}{3}$ variance of $x$ is $ \large\frac{272}{3}$ and variance of $y$ is $ \large\frac{131}{3}$. Then coefficient of correlation is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

A Diode Laser

asked Jan 31, 2014 by meena.p

1 answer

The compound insoluble in acetic acid is :

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 $x$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$NO+O_3\rightarrow NO_2+O_2,O_3+hv\rightarrow x+y,NO_2+O\rightarrow z+x$.Net reaction :$A(O_3)+hv\rightarrow BO_2$.$B-A$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

If a, g and h are the AM, GM and HM respectively of two positive numbers x and y, then identify the correct statement.

asked Jan 18, 2014 by yamini.v

1 answer

Calculate the wavelength of radiations emitted producing a line in Lyman series,when an electron falls from fourth stationary state in hydrogen atom $(R_H=1.1\times 10^7m^{-1})$

asked Jan 15, 2014 by sreemathi.v

1 answer

The points $(5,0,2),\:(2,-6,0),\:(4,-9,6)\:and\:(7,-3,8)$ represent vertices of a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

$\lim\limits_{x\to 0}\big(\large\frac{a^x+b^x+c^x}{3}\big)^{1/x}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int e^x (a e^x+b)^n. dx$

asked Dec 19, 2013 by meena.p

1 answer

Base strength of :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Peritrophic membrane is secreted in which part of Cockroach ?

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow b\:\:is\:\: \perp\:\:to \:\:\overrightarrow a+\overrightarrow b\:\:and\:\:\overrightarrow a\:\:is\:\:\perp \:\:to\:\:2\overrightarrow b+\overrightarrow a$ then $|\overrightarrow a|=?$

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

Reduced, functionless mandibles are present in

asked Dec 5, 2013 by thanvigandhi_1

0 answers

The number of lone pairs of e's present in $Xe$ in $XeF_4$

asked Nov 29, 2013 by sreemathi.v

1 answer

$K_{sp}$ of $Mg(OH)_2$ is $1 \times 10^{-12}$, 0.01 M $Mg^{+}$ will precipitate at the limiting $pH$ of

asked Nov 27, 2013 by mosymeow_1

1 answer

The total number of moults and Ascaris larva undergoes to become an adult is :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

The period of revolution of Jupiter around the sun is 12 times the period of revolution of the earth around the sun. The distance between the Jupiter and sun is n times the distance between the earth and sun. Then the value of n is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

If in any $\Delta ABC$ $A=30^{\large \circ}$ and $B=60^{\large\circ}$ then find $a: b:c$

asked Nov 15, 2013 by sreemathi.v

1 answer

Two vectors are $( \overrightarrow A + \overrightarrow B)$ and $( \overrightarrow A - \overrightarrow B)$. The angle between their resultant vector and $ \overrightarrow A $ is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

$5ml$ of a gaseous hydrocarbon was exposed to $30ml$ of $O_2$.The resultant gas,on cooling is found to measure $25\;ml$ of which $10\;ml$ are obsorbed by NaOH and the remainder by pyrogallol.Determine molecular formula of hydrocarbons .All measurement are made at constant pressure and temperature.

asked Oct 30, 2013 by sreemathi.v

1 answer

A block of mass 'm' is placed on floor of a lift which is rough. The coefficient of friction between the block and the floor is $ \mu$ . When the lift falls freely , the block is pulled horizontally on the lift floor. The force of friction is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

The orbit of geo-stationary satellite is circular, the time period of satellite depends on (a) mass of the satellite (b) mass of the Earth (c) radius of the orbit (d) height of the satellite from the surface of Earth Which of the following is correct?

asked Oct 18, 2013 by meena.p

1 answer

Eight spherical rain drops of the same mass and radius are falling down with a terminal speed of $6\;cm-s^{-1}$. If they coalesce to form one big drop, what will be the terminal speed of bigger drop? (Neglect the buoyancy of the air )

asked Oct 11, 2013 by meena.p

1 answer

In the equation $ \bigg( \large\frac{1}{P \beta} \bigg)= \large\frac{y}{k_BT}$, where P is the pressure, y is the distance, $k_B$ is Boltzmann constant and T is the temperature. Dimensions of $ \beta $ are

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A launching vehicle carrying an artificial satellite of mass 'm'is set for launch on the surface of the earth of mass 'M' and radius 'R'. If the satellite is intended to move in a circular orbit of radius 7R, the minimum energy required to be spent by the launching vehicle on the satellite is : (Gravitational constant =G)

asked Sep 30, 2013 by meena.p

1 answer

A circular disc of radius $'R'$ is removed from a bigger circular disc of radius $'2R'$ such that the circumference of the disc touch. The center of mass of the new disc is at a distance $'\alpha R'$ from the center of the bigger disc. The value of $\alpha'$ is

asked Sep 24, 2013 by meena.p

1 answer

The gravitational force acting on a particle, due to a solid sphere of uniform density and radius $R$, at a distance of $3R$ from the center of the sphere is $F_1$. A spherical hole of radius $(R/2)$ is now made in the sphere as shown in the figure. The sphere with hole now exerts a force $F_2$ on the same particle. Ratio of $F_1$ to $F_2$ is :

asked Sep 17, 2013 by meena.p

1 answer

The magnitude of potential energy per unit mass of object at surface of earth is E. then the escape velocity of the object is

asked Aug 29, 2013 by meena.p

1 answer

A particular force acting on object has equation $F=-cx^3$ where x is displacement of object from some orgin and $c=1N/m^3$ What is magnitude of the work done by this force, as the object moves from $x=-2m,\; to\;x=+2m$

asked Aug 8, 2013 by meena.p

1 answer

A block rests on a rough inclined plane making an angle of $30 ^{\circ}$ with the horizontal. The coefficient of static friction between block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of block is $(g=10 m/s^2)$

asked Jul 15, 2013 by meena.p

1 answer

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