Recent questions tagged q120

At low pressure , the Van der Waal's equation is written as

asked Mar 3, 2014 by sharmaaparna1

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Br has a low reactivity in $CH_2 =CH-Br$ because (i) of -M effect of bromine (ii) of more electro negativity of bromine (iii) of partial double bond character between $C-Br $ bond. (iv) of the +M effect of bromine.

asked Feb 28, 2014 by meena.p

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A new carbon-carbon bond formation is possible in

asked Feb 27, 2014 by sreemathi.v

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Find the equation of asymptotes for the hyperbola $\large\frac{x^2}{a^2}-\frac{y^2}{b^2}$$=1$?

asked Feb 10, 2014 by sreemathi.v

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Harmonic mean of roots of equation $(5+\sqrt{2})\;x^2$ - $(4+\sqrt{2})\;x$ + $8$ + $2\;\sqrt{2}$ will be

asked Jan 21, 2014 by yamini.v

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An electron has a total energy of 2MeV.Calculate the effective mass of the electron in Kg and its speed .Assume rest mass of electron 0.511MeV

asked Jan 16, 2014 by sreemathi.v

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If $\overrightarrow v=2\hat i+\hat j-\hat k\:\:and\:\;\overrightarrow w=\hat i+3\hat k$ and $\overrightarrow u$ is a unit vector,then the maximum value of $ [\overrightarrow u\:\overrightarrow v\:\overrightarrow w]$ is ?

asked Jan 13, 2014 by rvidyagovindarajan_1

1 answer

Find the points of discontinuity of $y=\large\frac{1}{u^2+u-2}$ where $u=\large\frac{1}{x-1}$

asked Dec 31, 2013 by sreemathi.v

1 answer

Integrate :$\int \limits_0^{\frac{\pi}{4}}$$ \large\frac{\sin ^3 x}{\cos ^7 x}$$dx$

asked Dec 20, 2013 by meena.p

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Haploids are more suitable for mutation studies than the diploids. This is because :

asked Dec 18, 2013 by thanvigandhi_1

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In the figures shown below :

asked Nov 18, 2013 by thanvigandhi_1

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A zener diode voltage regulator operated in the range 120 - 180 V produces a constant supply of 110 V and 250 mA to the load. If the maximum current is to be equally shared between the load and zener, then the value of series resistance $(R_S)$ and load resistance (R_L)$ are :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

Which of the following statement is not correct when a junction diode is in forward bias?

asked Oct 20, 2013 by meena.p

1 answer

A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons

asked Oct 20, 2013 by thanvigandhi_1

1 answer

A wheel of radius 0.4 m can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and a mass of 4 kg is hung. An angular acceleration of $8\;rad-s^{-2}$ is produced in it due to the torque. Then moment of inertia of the wheel is :

asked Oct 14, 2013 by meena.p

1 answer

The emf of a cell E is 15 V as shown in the figure with an internal resistance of $ 0.5 \Omega $. Then the value of the current drawn from the cell is

asked Oct 13, 2013 by thanvigandhi_1

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A transistor having a $\beta$ to $80$ has a change in base current of $250\; \mu A$ then the change in collector current is :

asked Oct 1, 2013 by meena.p

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The sensitivity of a galvanometer is $60$ divisions /Amp. When a shunt is used, its sensitivity become 10 divisions/Amp. If the galvanometer is of resistance $20 \Omega$, the value of shunt used is :

asked Sep 24, 2013 by meena.p

1 answer

Of the following, $NAND$ gate is

asked Sep 18, 2013 by meena.p

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In the set of real numbers $R,$ an operation $^\ast $is defined by $a^\ast b=\sqrt{a^{2}+b^{2}}.$ Then the value of $(3^\ast4)^\ast 5$ is

asked May 27, 2013 by poojasapani_1

1 answer

The area of the triangle formed by the tangent at any point on the rectangular hyperbola $xy=72$ and its asymptotes is

asked May 14, 2013 by poojasapani_1

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