Recent questions tagged q74

A multi range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure $2V,20V$ and $200\;V$ using a galvanometer of resistance $10\Omega$ and that produces maximum deflection for current of $1mA$ Find $R_1,R_2$ and $R_3$ that have to be used

asked Jul 31, 2015 by meena.p

1 answer

Do magnetic forces obey Newton's third law : Verify for two current elements $\overrightarrow{dl_1}= dl \hat i$ located at the origin and $\overrightarrow{dl_2}= dl \hat j$ located at $(0,R,0). Both carry current I.

asked Jul 30, 2015 by meena.p

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A magnetic needle of magnetic moment $4.8 \times 10^{-2}\;JT^{-1}$ is placed at $30^{\circ}$ with the direction of uniform magnetic field of magnitude $3 \times 10^{-2} \;T$ Calculate the torque acting on the needle

asked Jul 21, 2015 by meena.p

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Is Ohm's law universally applicable for all conducting elements? If not give examples of elements which do not obey ohm's law

asked Jul 2, 2015 by meena.p

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A conductor with a cavity in it is given a charge Q. What will be the total charge on the surface of this conductor if another carrying charge q is placed in the cavity without touching the cavity ?

asked Apr 28, 2015 by meena.p

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Which of the following equations is not correctly formulated ?

asked Aug 1, 2014 by thanvigandhi_1

1 answer

True-or-False :If $\tan \theta+\tan 2\theta+\sqrt 3\tan \theta\tan 2\theta=\sqrt 3$ then $\theta=\large\frac{n\pi}{3}+\frac{\pi}{9}$

asked May 20, 2014 by sreemathi.v

1 answer

Sodium phenoxide when heated with $CO_2$ under pressure at $125^{\large\circ}C$ yields a product which on the acetylation produces $C$.The major product $C$ would be:

asked Apr 7, 2014 by sreemathi.v

1 answer

The chemical name of Vitamin A Is

asked Mar 30, 2014 by thanvigandhi_1

1 answer

An Alloy is formed by mixing.

asked Mar 20, 2014 by meena.p

1 answer

Calculate $ \Delta H_{C-H}$ from the following data: $ \Delta H^{\circ}_{combustion}$ of ethane and propane are $-372$ and $-530\: kcal/mol$ respectively, $ \Delta H_f^{\circ}$ of $CO_2(g)$ and $H_2O(l)$ are $-94$ and $-68\: kcal/mol,\: \Delta H^{\circ}$ for $C(graphite) \rightarrow C(g)\: is\: 172\: kcal \: and\: \Delta H_{H-H} \: is\: 104 \: kcal.$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Polymers are classified on the basis of structure in to

asked Mar 12, 2014 by thanvigandhi_1

1 answer

The formulae of Blue vitriol is

asked Mar 12, 2014 by meena.p

1 answer

In $I_3^-$ which one is correct

asked Mar 7, 2014 by sreemathi.v

1 answer

Compound $(A),C_8H_9Br$ gives a white precipitate when warmed with alcoholic $AgNO_3$. Oxidation of $(A)$ gives a acid $(B)$. $C_8H_6O_4.(B)$ easily forms anhydride on heating . Identify the compound $(A)$.

asked Feb 25, 2014 by meena.p

1 answer

The major product formed in the reaction given below is

asked Feb 24, 2014 by sreemathi.v

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Density of a gas is found to be $5.46g/dm^3$ at $27^{\large\circ}C$ at 2 bar pressure. What will be its density at STP?

asked Feb 23, 2014 by sharmaaparna1

1 answer

Consider the relation,$2Ag^++Cd\rightarrow 2Ag+Cd^{+2}$ the standard electrode potentials for $Ag^+/Ag$ and $Cd^{+2}/Cd$ couples $0.8\;V$ and $0.04\;V$ respectively Then the emf of given reaction will be (if $[Cd^{+2}]=0.1M,[Ad^+]=1M)$

asked Feb 18, 2014 by sreemathi.v

1 answer

The degree of dissociation $'\alpha'$ of a weak electrolyte is (N is number of ions given by 1 mol of the electrolyte)

asked Feb 14, 2014 by sreemathi.v

1 answer

Solve : $y' +\tan x.y =\tan x \quad y(\large\frac{\pi}{4})$$=1$

asked Feb 6, 2014 by meena.p

1 answer

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

asked Feb 6, 2014 by sreemathi.v

1 answer

The figure shows two capacitors of capacitance c and charged to same potential c connected in two circuits . What will be the charge on the capacitor after a time $t= cr$ from the start

asked Jan 30, 2014 by meena.p

1 answer

In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of

asked Jan 28, 2014 by sreemathi.v

1 answer

A group of 10 items has arithmatic mean 6. If the arithmatic mean of 4 of these remaining item is 7.5 then the mean of the remaining item is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

Which element form Hydride?

asked Jan 24, 2014 by sreemathi.v

1 answer

In Nitrogen fixation $N_2\qquad\underrightarrow {Nitrogenase}\qquad x \rightarrow NO_2^-\qquad\underrightarrow{\text{In soil}}\qquad y$.The y in the equation is

asked Jan 21, 2014 by sreemathi.v

1 answer

The energy of an electron in the first orbit of H-atom is -13.6eV.The possible value of excited state for electron in bohr orbit of H atom are :

asked Jan 15, 2014 by sreemathi.v

1 answer

A variable plane is at a distance $k$ from origin and meets the coordinate axes at the points $A,B,C$ respectively. then the locus of centroid of the $\Delta\:ABC$ is ?

asked Jan 6, 2014 by rvidyagovindarajan_1

1 answer

The first term of a $GP$ is $4$ and the sum of its $3^{rd}$ and $5^{th}$ terms is $360$. Find the common ratio.

asked Jan 6, 2014 by yamini.v

1 answer

If $G(x)=-\sqrt{25-x^2}$ then $\lim\limits_{x\to 1}\large\frac{G(x)-G(1)}{x-1}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \large\frac{\sin x}{1-\sin x}$$dx$

asked Dec 17, 2013 by meena.p

1 answer

Volume occupied by one molecule of water ( density = 1 gm $cm^{-3}$ ) is :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The animal whose body wall secretes thick covering call " Lorica " :

asked Dec 9, 2013 by thanvigandhi_1

0 answers

The annelidian character of peripatus is

asked Dec 5, 2013 by thanvigandhi_1

0 answers

If vector $\overrightarrow a$ is unit vector and it makes angle $\large\frac{\pi}{4}$ with $\hat k$ and $\overrightarrow a+\hat i+\hat j$ is also a unit vector, then $\overrightarrow a=?$

asked Dec 3, 2013 by rvidyagovindarajan_1

1 answer

$2R-Cl+Si\overset{Cu/300^{\large\circ}C}{\rightarrow}Organosilicon$

asked Nov 29, 2013 by sreemathi.v

1 answer

BOH is a weak base. Molar concentration of BOH provides a [OH^-] of $1.5 \times 10^{-3}$ M is [Given $K_b$ (BOH) = $1.5 \times 10^{-3}$]

asked Nov 27, 2013 by mosymeow_1

1 answer

The Jinga prawn is :

asked Nov 26, 2013 by thanvigandhi_1

0 answers

Drumstick Barr bodies are found in :

asked Nov 14, 2013 by thanvigandhi_1

0 answers

$\int \limits_0^{\pi} \large\frac{\theta \sin \theta}{1+\cos ^2 \theta} $$ d \theta$ is equal to :

asked Nov 13, 2013 by meena.p

1 answer

Observe the following statements : $A : \int \bigg(\large\frac { x^2-1}{x^2} \bigg)e. ^{\large\frac{x^2-1}{x}}\; dx= e^{\large\frac{x^2-1}{x}}+c.$$\qquad R:\int f'(x)e^{f(x)}dx=f(x)+c.$ Then which of the following is true ?

asked Nov 7, 2013 by meena.p

1 answer

The joint between carpal and metacarpal of thumb in private mammals is :

asked Oct 30, 2013 by thanvigandhi_1

1 answer

The mole fraction of the solute in one molar aqueous solution is

asked Oct 29, 2013 by sreemathi.v

1 answer

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