Recent questions tagged q113

Average velocity of the molecules of a gas in a container moving in one dimension is

asked Mar 2, 2014 by sharmaaparna1

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Which of the following statements are correct ?

asked Feb 28, 2014 by meena.p

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The fries rearrangement of the below reaction ,the P is

asked Feb 27, 2014 by sreemathi.v

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Let $ \varepsilon_0$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length and T = time and A = electric current then,

asked Feb 15, 2014 by thanvigandhi_1

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For the equation to represent the hyperbola $\large\frac{x^2}{9-\lambda}+\frac{y^2}{6-\lambda}$$=1$ what should be the value of $\lambda$?

asked Feb 10, 2014 by sreemathi.v

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Sum of series $(n)(n)$ + $(n-1)(n+1)$ + $(n-2)(n+2)$ +....+ $1\;(2n-1)$ is

asked Jan 20, 2014 by yamini.v

1 answer

A stationary $He^+$ ion emitted a photon corresponding to the first line $(H_{\alpha})$ of the Lyman series .That photon liberated a photo electron from a stationary H atom in ground state.What is the velocity of photo electron?$R_H=109678cm^{-1}$

asked Jan 16, 2014 by sreemathi.v

1 answer

If $\overrightarrow a=2\hat i+\hat j-2\hat k\:\;and\:\:\overrightarrow b=\hat i+\hat j$ and $\overrightarrow c$ is such that $\overrightarrow c.\overrightarrow a=|\overrightarrow c|$, $|\overrightarrow c-\overrightarrow a|=2\sqrt 2$ and the angle between $\overrightarrow a\times\overrightarrow b$ and $\overrightarrow c$ is $30^{\circ}$, then $|(\overrightarrow a\times\overrightarrow b)\times\overrightarrow c|=?$

asked Jan 7, 2014 by rvidyagovindarajan_1

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Let $f:R\rightarrow R$ be a function defined by $f(x)=min\{x+1,\mid x\mid+1\}$. Then which of the following is true ?

asked Dec 31, 2013 by sreemathi.v

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Integrate : $\int a ^{\log ax}. \sin b dx $

asked Dec 20, 2013 by meena.p

1 answer

Polysome is formed by :

asked Dec 18, 2013 by thanvigandhi_1

2 answers

For a thermocouple the temperature of cold junction $(T_c)$ neutral temperature $(T_n) $ and temperature of inversion $(T_i)$ are $ 0^{\circ}C, 285^{\circ}C\: and \: 585^{\circ}C$ respectively. If the temperature of cold junction is raised to $ 10^{\circ}C$ then :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

In the thermocouple, cold junction is at $0^{\circ}C$, hot junction is at $t^{\circ}C$. The graph drawn between thermo - emf (E) and temperature of the hot junction (t) is represented by the equation , $E=at+bt^2$. If $ a = -224b$ the neutral and the inversion temperatures of the thermocouple respectively, in degree celsius are :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

A certain particle has a half life of 60 seconds. The fractions of the particles that will decay at the end of 10 seconds is

asked Oct 20, 2013 by thanvigandhi_1

1 answer

A copper constantan thermocouple produces an e.m.f of $40\;\mu V$ per $^{\circ}C$. The smallest temperature difference that can be measured with this thermocouple is $42.5 ^{\circ}C$, When a galvanometer capable of detecting as low as $10^{-6}\;amp$ is employed. The resistances of that galvanometer is

asked Oct 20, 2013 by meena.p

1 answer

The work function of a certain metal is $3.31 \times 10^{-19}\;J$. Then the maximum kinetic energy of photo electrons emitted by radiation of wavelength 5000 A is : (given $h=6.62 \times 10^{-34}\;J-s, C= 3 \times 10^{8}ms^{-1},e= 1.6 \times 10^{-19}$ coul.)

asked Oct 14, 2013 by meena.p

1 answer

A $U^{235}$ reactor generates power at a rate of P producing $ 2 \times 10^{18}$ fissions per second. The energy released per fission is 185 MeV. The value of P is

asked Oct 12, 2013 by thanvigandhi_1

1 answer

The thermo e.m.f of a thermo-couple is given by , $\xi =a T +bT^2,$ where $a/b=-200^{\circ}C$. If the cold function is kept at $30^{\circ}$, then the inversion temperature is ($ \xi$ in volts, T is in centigrade):

asked Sep 30, 2013 by meena.p

1 answer

A fully charged capacitor has a capacitance $'C'$. It is discharged through a small coil resistance wire, embedded in a block of specific heat $'s'$ and mass $'m'$ under thermally isolated conditions. If the temperature of the block is raised by $'\Delta T$, the potential difference $V$ across the capacitor initially is :

asked Sep 24, 2013 by meena.p

1 answer

A series $LCR$ circuit is connected across a source of alternating emf of changing frequency and resonates at frequency $f_0$. Keeping capacitance constant, if the inductance (L) is increased by $\sqrt 3$ times and resistance is increased (R) by 1.4 times, the resonant frequency now is

asked Sep 18, 2013 by meena.p

1 answer

Which of the following is not a binary operation on $R$

asked May 24, 2013 by poojasapani_1

1 answer

The locus of the point of intersection of perpendicular tangents to the hyperbola $\large\frac{x^{2}}{16}-\frac{y^{2}}{9}$=$1$ is

asked May 14, 2013 by poojasapani_1

1 answer

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