Recent questions tagged q115

At room temperature , the rms speed of molecules of a certain diatomic gas is formed to be 1930 m/Sec . The gas is

asked Mar 2, 2014 by sharmaaparna1

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Which of the following compounds will have only primary and tertiary carbon? (i) Pentane (ii) 2- Methylbutane (iii) 2,3 -Dimethylbutane (iv) 2- Bromo-2-Methylpropane

asked Feb 28, 2014 by meena.p

1 answer

In the following compounds

asked Feb 27, 2014 by sreemathi.v

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

asked Feb 10, 2014 by sreemathi.v

1 answer

Sum of series $\;S=\frac{1}{2\sqrt{1}+1\sqrt{2}}+\frac{1}{3\sqrt{2}+2\sqrt{3}}+\;....\;+\frac{1}{100\sqrt{99}+99\sqrt{100}} \;is$

asked Jan 20, 2014 by yamini.v

1 answer

Find the quantum no 'n' corresponding to the excited state of $He^+$ ion if on transition to the ground state that ion emits two photons in succession with wavelength 108.5 and 30.4nm

asked Jan 16, 2014 by sreemathi.v

1 answer

If $P$ is point whose position vector is $\overrightarrow r=x\hat i+y\hat j+z\hat k$ where $x,y,z \in N$ and $\overrightarrow a=\hat i+\hat j+\hat k$, then the number of possible points $P$ for which $\overrightarrow r.\overrightarrow a=10$ is ?

asked Jan 7, 2014 by rvidyagovindarajan_1

1 answer

Let $f:R\rightarrow R$ be a function such that $f(x+y)=f(x)+f(y)\forall x,y\in R$ if $f(x)$ is differentiable at $x=0$ then

asked Dec 31, 2013 by sreemathi.v

1 answer

Integrate : $\int (x+1)^2$

asked Dec 20, 2013 by meena.p

0 answers

In the light of recent classification of living organisms into three domains of life ( bacteria, archaea and eukarya ) , which one of the following statements is true about archaea ?

asked Dec 18, 2013 by thanvigandhi_1

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A metal rod of length 2 m is rotating with an angular velocity of 100 radiance / second in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of rod is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A series LCR circuit is connected to a source of alternating emf 50 V and if the potential differences across inductor and capacitor are 90 V and 60 V respectively, the potential difference across resistor is :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

Two concentric coils of 10 turns each are placed in the same plane. Their radii are 20 cm and 40 cm and carry 0.2 and 0.3 amp. current respectively in opposite directions. The magnetic induction (in Tesla) at the center is

asked Oct 20, 2013 by meena.p

1 answer

The de-Broglie wavelength of a free electron with kinetic energy 'E' is $ \lambda$. If the kinetic energy of the electron is doubled, the de-Broglie wavelength is

asked Oct 20, 2013 by thanvigandhi_1

1 answer

The radio activity of a sample is $'X'$ at a time $'t_1'$ and $'Y'$ at a time '$t_2'$. If the mean life time of the specimen is 't', the number of atoms that have disintegrated in the time interval $(t_1-t_2)$ is :

asked Oct 14, 2013 by meena.p

1 answer

The $ K_{ \alpha} - $ X-ray of molybdenum has a wave length of $ 71 \times 10^{-12}m$. If the energy of a molybdenum atom with K-electron removed is 23.32 KeV, then the energy of molybdenum atom when an L-electron removed is $(hc = 12.42 \times 10^{-7} eV)$

asked Oct 12, 2013 by thanvigandhi_1

1 answer

A capacitor $0.1\;\mu F$ connected in series to a resistor of $10 \;M \; \Omega$ is charged to a certain potential and then made a discharge through the resistor. The time in which the potential will take to fall to half its original value is (Given $\log _{10}2=0.3010$):

asked Sep 30, 2013 by meena.p

1 answer

The electric current i in the circuit shown is :

asked Sep 24, 2013 by meena.p

1 answer

Initially a photon of wavelength $\lambda _1$ falls on photocathode and emits an electron of maximum energy $E_1$. If the wave length of the incident photon i changed to $\lambda _2$, the maximum energy of the electron emitted becomes $E_2$. Then value of hc (h= Planck's constant , c= velocity of light) is

asked Sep 18, 2013 by meena.p

1 answer

Length of the semi-transverse axis of the rectangular hyperbola $xy=8$ is

asked May 14, 2013 by poojasapani_1

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