Recent questions tagged q56

It is because of inability of $ns^2$ electrons of the valence shell to participate in bonding that :

asked Nov 6, 2017 by meena.p

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Biot -savart law indicates that the moving electrons (velocity $\overrightarrow{v}$) produce a magnetic field $\overrightarrow{B}$ such that

asked Jul 29, 2015 by meena.p

1 answer

Assume the dipole model for earth's magnetic field B which is given by $B_v$ =Vertical component of magnetic field $=\large\frac{\mu_0}{4 \pi}.\frac{2m \cos \theta}{r}$ $B_H$= Horizontal component of magnetic field $\qquad= \large\frac{\mu_o}{4 \pi} \frac{\sin \theta m}{r^3}$ $\theta= 90^{\circ}$- latitude as measured from magnetic equator . Find loci of points for which clip angle is zero.

asked Jul 16, 2015 by meena.p

1 answer

A heating element using michrome connected to a $230\;V$ supply draws an initial current of $3.2 \;A$ Which settles after a few seconds to a steady value of $2.8 \;A$. What is the steady temperature of the heating element if the room temperature is $27.0^{\circ}$ ? Temperature coefficient of resistance of michrome averaged over the temperature range involved is $1.70 \times 10^{-4 \circ}C^{-1}$

asked Jun 30, 2015 by meena.p

1 answer

What is the force between two charged spheres having charges of $2 \times 10^{-7}\;C$ and $ 3 \times 10^{-7} C $ placed $30\;cm$ apart in air?

asked Apr 27, 2015 by meena.p

1 answer

If $e$ is the eccentricity of the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}\normalsize =1\;(a < b)$,then

asked Oct 17, 2014 by sreemathi.v

1 answer

Which of the following salts is not formed when $CuSO_4.5H_2O$ is heated ?

asked Jul 31, 2014 by thanvigandhi_1

1 answer

Chrome alum is

asked Jul 26, 2014 by thanvigandhi_1

1 answer

State whether the following is true or false and justify : Line joining the points (3, – 4) and (– 2, 6) is perpendicular to the line joining the points (–3, 6) and (9, –18).

asked Jul 9, 2014 by thanvigandhi_1

1 answer

True-or-False:There will be only at 24 selections containing atleast one red ball out of a bag containing 4 red and 5 black balls.It is being given that balls of the same colour are identical.

asked May 16, 2014 by sreemathi.v

1 answer

The value of $\cos^248^{\large\circ}-\sin^212^{\large\circ}$ is

asked Apr 21, 2014 by sreemathi.v

1 answer

Three positive numbers form an increasing G.P. If the middle term in this G.P. is doubled, the new numbers are in A.P. Then the common ratio of the G.P. is

asked Apr 7, 2014 by meena.p

1 answer

The reason for the double helical structure of DNA is the operation of

asked Mar 29, 2014 by thanvigandhi_1

1 answer

Calcination is used in metallurgy for removal of?

asked Mar 18, 2014 by meena.p

1 answer

Which of the following statements is true?

asked Mar 17, 2014 by thanvigandhi_1

1 answer

Co-polymers can be obtained by

asked Mar 11, 2014 by thanvigandhi_1

1 answer

Which of the following is the correct order of bond angle

asked Mar 6, 2014 by sreemathi.v

1 answer

Lewis Octet rule was failed ,to explain the following structure of molecule

asked Mar 5, 2014 by sreemathi.v

1 answer

Which of the following statement is correct?

asked Mar 4, 2014 by sreemathi.v

1 answer

Arrange in order of decreasing trend towards ES (electrophilic substitution) reactions: Chlorobenzene (I), Benzene (II), Anilinium chloride (III), Toluene (IV)

asked Feb 24, 2014 by meena.p

1 answer

Which of the following statements is correct?

asked Feb 21, 2014 by sreemathi.v

1 answer

Which of the following facts is not true?

asked Feb 17, 2014 by sreemathi.v

1 answer

Find the point of intersection of normals at any two points on the parabola $y^2=4ax$

asked Feb 6, 2014 by sreemathi.v

1 answer

Observation show that rate of change of atmosphere pressure P with attitude h is proportional to pressure. Assume that pressure at 6000 meter is half of its value $P_0$ at sea level, find formula for pressure at any height.

asked Feb 6, 2014 by meena.p

1 answer

Select the correct IUPAC name for: $[FeF_4(OH_2)_2]^-$

asked Feb 3, 2014 by sreemathi.v

1 answer

Which forms coloured salts.

asked Jan 30, 2014 by sreemathi.v

1 answer

Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.

asked Jan 28, 2014 by meena.p

1 answer

Passivity is exhibited by

asked Jan 28, 2014 by sreemathi.v

1 answer

The A.M of squares of first $n$ natural numbers is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The volume of oxygen liberated at STP when 10ml of 15v-$H_2O_2$ decomposes

asked Jan 23, 2014 by sreemathi.v

1 answer

Which of the following is used as Bioremedies

asked Jan 21, 2014 by sreemathi.v

1 answer

In Bohr series of lines of hydrogen spectrum,third line from the red end corresponds to which one of the following inner orbit jumps of electron of Bohr orbit in atom of hydrogen

asked Jan 13, 2014 by sreemathi.v

1 answer

If $P(x,y,z)$ is a point on the line segment joining $Q(2,2,4)\:\:and\:\:R(3,5,6)$ such that the projections of $\overrightarrow {OP}$ on the coordinate axes are $\large\frac{13}{5},\frac{19}{5},\frac{26}{5}$ respectively, then $P$ divides $QR$ in the ratio ?

asked Jan 3, 2014 by rvidyagovindarajan_1

1 answer

The angles of a quadrilateral are in AP whose common difference is $10^0$. Find the angles.

asked Jan 3, 2014 by yamini.v

1 answer

$\lim\limits_{x\to 0}\large\frac{(1-\cos 2x)\sin 5x}{x^2\sin 3x}$=

asked Dec 24, 2013 by sreemathi.v

1 answer

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