Recent questions tagged q97

Magnetic field applied on a cyclotron is $0.7 \;T$ and radius of its dees is $1.8 \;m$ what will be the energy of the emergent protons in $MeV?$

asked Aug 5, 2015 by meena.p

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A circular coil of $300$ turns and diameter 14 cm carries a current of $15\;A$ . What is the magnitude of magnetic moment associated with the coil ?

asked Jul 22, 2015 by meena.p

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Electrostatic potential V at a point of a distance r from a charge q varies as

asked Jul 8, 2015 by meena.p

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The earth's surface has a negative surface charge density of $ 10^{-9}cm^{-2}$. The potential difference of $400\;kv$ between the top of the atmosphere and the surface results (due to low conductivity of the lower atmosphere ) in a current of only $1800\;A$ over the entire globe. If their were no mechanism of sustaining atmosphere field, how much time (roughly) would be required to neutralise the the earth's surface ? (This never happen in practice became there is a mechanism to replenish electric charges namely the continual thunder storms and lighting in different parts of the globe) . Radius of the earth $=6.37 \times 10^6m$

asked Jul 3, 2015 by meena.p

1 answer

The correct statement about the following disaccharide is

asked Mar 31, 2014 by thanvigandhi_1

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S1: Heat absorbed during isothermal expansion of ideal gas in vacuum is zero. \[\] S2: Volume occupied by molecules of ideal gas is zero.

asked Mar 20, 2014 by thanvigandhi_1

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The ore having two different metal atoms is

asked Mar 20, 2014 by meena.p

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What is the co-ordination number of the central metal ions in $[Mo(CN)_8]^{4-}$

asked Mar 13, 2014 by meena.p

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The starting material for PCTFE is

asked Mar 12, 2014 by thanvigandhi_1

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The hybridisation of N atom in $NO_2^-$ is

asked Mar 7, 2014 by sreemathi.v

1 answer

A sinusoidal electromagnetic plane wave travels through the empty space in $x$ - direction. The electric wave is polarized in the $y$ - direction frequency of waves is $1.5\: GHz$. At a certain point $P$ in space, the oscillating $E_y$ attains a maximum magnitude $E_o = 6.3 \: V/m$ \[\] What is the wavelength of the wave?

asked Mar 5, 2014 by thanvigandhi_1

1 answer

Optical and isomers are compounds which contain the same number and kinds of atoms, and bonds (ie the connectivity between atoms is the same), and different spatial arrangements of the atoms, but which have non-super imposable mirror images. Each non-super imposable mirror image structure is called an enantiomer. Optical isomers get their name because the plane – polarized light that is passed through a sample of a pure enantiomers is rotated. The planeis rotated in the opposite direction but with the same magnitude when plane- polarized light is passed through a pure sample containing the other enantiomer of a pair. A solution of one enantiomer rotates the plane of polrisation in a clockwise direction. This enantiomer is known as the (+) form. A solution of the other enantiomer rotales the plane of polarisation in an anti-clockwise direction. This enantiomer is known as (-) form.

asked Feb 27, 2014 by meena.p

1 answer

In the below sequence X and Y are

asked Feb 26, 2014 by sreemathi.v

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A tank contains $200\; gal$ of water of $40\; lb$ salt dissolves. $5\; gal$ of brine , each containing $2\; lb$ of dissolved salt, run into tank per minute and mixture kept uniform by stirring runs out at same rate. Find amount of salt $y(t)$ in tank at any time $(t)$

asked Feb 7, 2014 by meena.p

1 answer

The locus of a point which moves in a plane such that its distance from a fixed point (i.e focus) is e times its distance from a fixed line (i.e directix).It is called as __________

asked Feb 7, 2014 by sreemathi.v

1 answer

Gypsum is not chemically similar to

asked Jan 29, 2014 by sreemathi.v

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$2D_2O\quad\underrightarrow{\text{Electrolysis}}\quad A+B$. $A+B$ are

asked Jan 27, 2014 by sreemathi.v

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$Cl+O_3\rightarrow x+O_2, \\ ClO+O\rightarrow y+O_2 \\ Net\; reaction\; :\; O_3+O\overset{Cl}{\longrightarrow} z. \; \\ Then \;x\; is$

asked Jan 22, 2014 by sreemathi.v

1 answer

Sum of series $S$ = $\frac{1}{2}$+$\frac{1}{3}\;(1+2)$+$\frac{1}{4}\;(1+2+3)$+$\frac{1}{5}\;(1+2+3+4)$+......upto 20 terms is

asked Jan 20, 2014 by yamini.v

1 answer

Aqueous solution of carnalite gives positive test for

asked Jan 17, 2014 by sreemathi.v

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Calculate the momentum of electron moving with $\large\frac{1}{3}$rd velocity of light

asked Jan 15, 2014 by sreemathi.v

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Find the angle between any two diagonals of a cube.

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

Let $f(x)=\left\{\begin{array}{1 1}\big[\tan(\large\frac{\pi}{4}\normalsize +x)\big]^{\large\frac{1}{x}}&x\neq 0\\k&x=0\end{array}\right.$.For what value of k,$f(x)$ is continuous at $x=0$

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate: $\int \large\frac{e^{-\tan ^{-1}(a^x)}}{[1+(a^x)^2]}$$a^x.dx$

asked Dec 19, 2013 by meena.p

1 answer

Acetophenone when reacted with a base, $ C_2H_5ONa,$ yields a stable compound which has the structure :

asked Dec 18, 2013 by thanvigandhi_1

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Mode of feeding in Tunicates:

asked Dec 11, 2013 by thanvigandhi_1

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If $\overrightarrow {\alpha}=(x+4y)\overrightarrow a+(2x+y+1)\overrightarrow b\:\:and\:\:\overrightarrow {\beta}=(y-2x+2)\overrightarrow a+(2x-3y-1)\overrightarrow b$ where $\overrightarrow a\:\:\overrightarrow b$ are non zero non collinear and if $3\overrightarrow {\alpha}=2\overrightarrow {\beta}$, then $(x,y)=?$

asked Dec 10, 2013 by rvidyagovindarajan_1

1 answer

B- Lymphocytes are concerned with

asked Dec 5, 2013 by thanvigandhi_1

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When $0.1\; mol$ of $CH_3NH_2$ (ionisation constant, $K_b = 5 \times 10^{-4}$) is mixed with $0.08\;mol\; HCl$ and the volume is made up to $1\; L$ find the [$H^+$] of resulting solution,

asked Nov 27, 2013 by mosymeow_1

1 answer

The earthworms, insets and snails are ;

asked Nov 27, 2013 by thanvigandhi_1

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The pressure P for a gas is plotted against its absolute temperature T for two different volumes $V_1\: and \: V_2$ where $ V_1 > V_2$ . If P is plotted on $y$ - axis and T on $x$ - axis then :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

In a $\Delta$ABC if the sides are $a=3,b=5,c=4$ then $\sin\large\frac{B}{2}$$+\cos{\large\frac{B}{2}}$ is equal to

asked Nov 15, 2013 by sreemathi.v

1 answer

A uniform chain of length 'l' is placed on a rough table, with its length $ \large\frac{l}{n} ( n > 1)$ hanging over the edge of the table. If the chain just begins to slide off the table by itself, the coefficient of friction between the chain and the table is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

Calculate molarity of water $(d_{H_2O}=1gml^{-1})$

asked Oct 31, 2013 by sreemathi.v

1 answer

A capillary tube of radius 'r' is immersed in water and water rises in it to a height 'h'. Mass of water in the capillary tube is $ 5 \times 10^{-3}kg$ . Another capillary tube of radius $ \bigg( \large\frac{r}{2} \bigg)$ is immersed in water. The mass of water that will rise in this tube is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

There is some change in length when a 33000 N tensile force is applied on a steel rod of area of cross- section $10^{-3}m^2.$ The change of temperature required to produce the same elongation if the steel rod is heated, is (The modulus of Elasticity is $3 \times 10^{11}\;N/m^2$ and the coefficient of linear expansion of steel is $1.1 \times 10^{-5}/^{\circ}C)$.

asked Oct 18, 2013 by meena.p

1 answer

Three rods of same dimensions have thermal conductivities 3K,2K and K. They are arranged as shown in the figure below:

asked Oct 11, 2013 by meena.p

1 answer

A ball of mass 'm' moving with a horizontal velocity 'v' strikes the bob of a pendulum at rest. Mass of the bob of the pendulum is also 'm''. During this collision the ball sticks with the bob of the pendulum. The height to which the combined mass rises ( g = acceleration due to gravity )

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Three rods of equal lengths are joined to form an equilateral triangle ABC. D is the mid-point of AB. The coefficient of linear expansion is $\alpha _1$ for material of rod $AB$ and $\alpha _2$ for material of rods $AC$ and $BC$. If the distance $DC$ remains constant for small changes in temperature, then:

asked Sep 30, 2013 by meena.p

1 answer

Two blocks of masses $1\;kg$ and $2\;kg$ are connected by are connected by a metal wire going over a smooth pulley. The breaking stress of metal is $\large\frac{40}{3 \pi}$$\times 10^6\;Nm^{-2}$.What should be the minimum radius of wire used if it should not break? $(g=10\;m/s^{-2})$

asked Sep 24, 2013 by meena.p

2 answers

On a temperature scale Y, water freezes at $ -160^{\circ} \;Y$ and boils at $-50^{\circ}Y$. On this $Y$ scale, a temperature of $340\;K$ is:

asked Sep 17, 2013 by meena.p

0 answers

A solid sphere of uniform density and radius 4 units is located with its center at origin O. Two spheres of equal radii/ units with their center $A(-2,0,0)$ and $B(2,0,0)$ respectively are taken out of the solid leaving behind cavities as shown Then

asked Aug 30, 2013 by meena.p

1 answer

A tennis ball dropped from height of $2m$ rebounds only $1.5 m, $ after hitting the ground , What fraction of energy is lost in the impact

asked Aug 8, 2013 by meena.p

1 answer

A block of mass $5 kg$ lies on a horizontal table. A force of $19.6 N$ is enough to keep the body sliding at uniform speed. The coefficient of sliding friction

asked Jul 15, 2013 by meena.p

1 answer

The differential equation obtained by eliminating $a$ and $b$ from $y=ae^{3x}+be^{-3x}$ is

asked May 23, 2013 by poojasapani_1

1 answer

The length of the semi-major and the length of the semi-minor axis of the ellipse $\large\frac{x^{2}}{144}+\frac{y^{2}}{169}$=$1$ are

asked May 13, 2013 by poojasapani_1

1 answer

Evaluate:\[\int\limits_0^{\pi/2} \frac {\sqrt {\tan x}}{1+\sqrt {\tan x}}dx\]

asked Feb 4, 2013 by meena.p

1 answer

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