Recent questions tagged q77

A rectangular conducting loop consists of two wires on two opposite sides of length l joined together by rod of length d. The wires are each of the same material but with cross - section differing by a factor of 2. The thicker wire has a resistance R and the rods of low resistance , Which in turn are connected to a constant voltage source $V_0$ the loop is placed in uniform magnetic field B at 45 to its plane . Find the $T$ the torque exerted by the magnetic field on the loop about an axis through the centers of rods.

asked Jul 31, 2015 by meena.p

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Why do we prefer steel or alnico for making permanent magnets ?

asked Jul 21, 2015 by meena.p

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Choose the correct alternative : Alloys of metals usually have___________ (greater / lesser) resistivity than that of their constituent metals

asked Jul 2, 2015 by meena.p

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In a certain region of space , electric field is along the z- direction throughout. The magnitude of electric field is, however not constant but increases uniformly along the positive z- direction, at the rate of $10^5 N/c-m$. What are the force and torque experienced by a system having a total dipole moment equal to $10^{-7}c-m$ in the negative z- direction ?

asked Apr 28, 2015 by meena.p

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The equation which is balanced and represents the correct product(s) is

asked Apr 7, 2014 by sreemathi.v

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Hypervitaminosis is due to

asked Mar 30, 2014 by thanvigandhi_1

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Among the following the wrong one is

asked Mar 20, 2014 by meena.p

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Water gas is fuel made by passing steam over red hot coke as $ H_2O(g) + C(s) \rightarrow CO(g)+H_2(g)$ \[\] Given that $ \Delta H_f^{\circ} \: of\: H_2O(g), CO(g)\: are\: -241.8\: and \: -110.5\: kJ/mol$. Also, the values of $S^{\circ}$ for $H_2O(g), C(s), CO(g)\: and\: H_2(g)\: are\: 188.7, 197.9, 131\: and\: 5.69\: J/Kmol$ respectively. Assuming $ \Delta H^{\circ}\: and\: \Delta S^{\circ}$ to be temperature independent, the temperature at which the reaction becomes favorable is

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Identiify the chain growth polymer from the following

asked Mar 12, 2014 by thanvigandhi_1

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The name wonder metal is given to

asked Mar 12, 2014 by meena.p

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Which of the following is the correct order of lattice energy

asked Mar 7, 2014 by sreemathi.v

1 answer

The $rms$ value of the electric field of the light coming from the sun is $720\: N/C$. The average total energy density of the electromagnetic wave is

asked Mar 3, 2014 by thanvigandhi_1

1 answer

Which of the following rings in most strained ?

asked Feb 26, 2014 by meena.p

1 answer

Which of the following statement is correct?

asked Feb 25, 2014 by sreemathi.v

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A molecule $A_2B$(mol.weight = 166.4) occupies triclinic lattice with a = 5A , b = 8A and C = 4A . If density of $AB_2$ is $5.2g cm^{-3}$. Calculate the number of molecules present in one unit cell.

asked Feb 24, 2014 by sharmaaparna1

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The half potential of $Cl^{-1}(C_1)/AgCl/Ag$ electrode.Given the value of $E^0$ for $Ag^++e^-\rightarrow Ag$ and $K_{sp}$ of AgCl is

asked Feb 18, 2014 by sreemathi.v

1 answer

Which of the following azeotropic solutions has the boiling point less than the boiling point of the constituents

asked Feb 14, 2014 by sreemathi.v

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Find the parametric form of normal for the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?

asked Feb 7, 2014 by sreemathi.v

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Solve : $ x \large\frac{dy}{dx}- \frac{y}{2}$$=x(\sin ^{-1}x) y^5$

asked Feb 6, 2014 by meena.p

1 answer

The following logic circuit has output

asked Jan 30, 2014 by meena.p

1 answer

Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

On thirteen consecutive days the number of persons booked for violating speed limit of 40 km / hr were as follows. \[ \] 58, 61, 68, 57, 62, 50, 55, 62, 53, 54, 51, 59, 52 \[\] The median number of speed violations per day is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

Which of the following is best $CO_2$ absorber as well as source of $O_2$ in space capsule?

asked Jan 28, 2014 by sreemathi.v

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Decomposition of $NaCl\rightarrow x+y$.They are

asked Jan 24, 2014 by sreemathi.v

1 answer

Sinks of carbon monoxide $2CO+O_2\qquad \underrightarrow {soil}\qquad x$.$CO+3H_2\qquad\underrightarrow{soil}\qquad y+z$.The $z$ in the equation is

asked Jan 21, 2014 by sreemathi.v

1 answer

The wavelength of a golf ball weighing 200g and moving with a speed of 5m/h is of the order :

asked Jan 15, 2014 by sreemathi.v

1 answer

The value of $k$ for which the line $\overrightarrow r=(4\hat i+2\hat j-\hat k)+\lambda(\hat i-k\hat j+2\hat k)$ lies on the plane $2x-4y+z=3$ is ?

asked Jan 6, 2014 by rvidyagovindarajan_1

1 answer

Find the sum of the series upto 20 term 1+(1+2)+(1+2+3)+--------

asked Jan 6, 2014 by yamini.v

1 answer

$\lim\limits_{x\to 1}\large\frac{\sqrt{1-\cos 2(x-1)}}{x-1}$=

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \large\frac{ e^{5x}+e^{-7x}}{e^{2x}}$$dx$

asked Dec 18, 2013 by meena.p

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The alkali metals from salt- like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders ?

asked Dec 17, 2013 by thanvigandhi_1

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Development of mesoderm in the form of muscles in body wall, leaving the alimentary canal non - muscular is the feature of :

asked Dec 9, 2013 by thanvigandhi_1

1 answer

Which one of the following is an excitatory neurotransmitter ?

asked Dec 5, 2013 by thanvigandhi_1

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If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are any three unit vectors such that $\overrightarrow a.\overrightarrow b=\overrightarrow a.\overrightarrow c=0$ and the angle between $\overrightarrow b\:\:and\:\:\overrightarrow c $ is $\large\frac{\pi}{6}$, then $\overrightarrow b\times\overrightarrow c=?$

asked Dec 5, 2013 by rvidyagovindarajan_1

1 answer

Water gas has

asked Nov 29, 2013 by sreemathi.v

1 answer

For the reaction $S_2O_3^{2-} (aq) + 2H_3O^+ (aq) \rightleftharpoons S (s) + H_2SO_3 (aq) + H_2O(l)$; Rate = $k [H_3O^+][S_2O_3^{2-}]$. Reaction is fastest in

asked Nov 27, 2013 by mosymeow_1

1 answer

The pH of an acid rain water is :

asked Nov 26, 2013 by thanvigandhi_1

0 answers

Find the frequency of heterozygotes in a population which exhibits the Hardy-Weingberg equilibrium, if the frequencies of the two alleles in the population are 0.6 and 0.4 :

asked Nov 15, 2013 by thanvigandhi_1

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If $dx+dy=(x+y)(dx-dy)$ then $\log (x+y)$ is equal to:

asked Nov 13, 2013 by meena.p

1 answer

$\int _{-1} ^ 1 \large\frac{\cos h x }{1+e^{2x}}$$dx$ is equal to :

asked Nov 7, 2013 by meena.p

1 answer

Match the following with reference to the insects and diseases :

asked Oct 30, 2013 by thanvigandhi_1

1 answer

$100\;mL$ of a mixture of $NaOH$ and $Na_2SO_4$ is neutralized by $10\;mL$ of $0.5\;M$ $H_2SO_4$. Hence $NaOH$ in $100\;mL$ solution is

asked Oct 29, 2013 by sreemathi.v

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