Recent questions tagged q89

Why do we make use of steel for making permanent magnets.

asked Aug 4, 2015 by meena.p

1 answer

What is the susceptibility and permeability of a perfectly diamagnetic substance ?

asked Aug 4, 2015 by meena.p

1 answer

In a magnetic of a certain place, the horizontal component of the earth magnetic field is $0.26 \;G$ and dip angle is $60^{\circ}$ What is the magnetic field of earth at this location ?

asked Jul 22, 2015 by meena.p

1 answer

Determine the current drawn from a 12 v supply with internal resistance $0.5 \Omega$ by the infinite network shown in the figure . Each resistor has $\Omega$ resistance

asked Jul 7, 2015 by meena.p

1 answer

For complete combustion of ethanol $C_2H_5OH(l)+3O_2(g)\rightarrow 2CO_2(g)+3H_2O(l)$ the amount of heat produced as measured in bomb calorimeter,is 1$364.47\; kJ mol^{–1}$ at $25^{\large\circ}C$.Assuming ideality the Enthalpy of combustion,$\Delta_eH$,for the reaction will be: $(R = 8.314 kJ mol^{–1}$)

asked Apr 7, 2014 by sreemathi.v

1 answer

Which of the following is an amine hormone?

asked Mar 31, 2014 by thanvigandhi_1

1 answer

1-pentyne(A) is treated with $4N$ alcoholic $KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2$-pentyne(B) and $3.5 \%$ of $1,2-$ pentadiene(C). The equilibrium was maintained at $175^{\circ}C. $ \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $B \leftrightharpoons C$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The process that is not carried out while doing the concentration of an ore is

asked Mar 20, 2014 by meena.p

1 answer

Iron is extracted from :

asked Mar 13, 2014 by meena.p

1 answer

Which of the following biodegradable polymer of polyamide class?

asked Mar 12, 2014 by thanvigandhi_1

1 answer

The nodal plane in the $\pi$-bond of ethene is located in

asked Mar 7, 2014 by sreemathi.v

1 answer

The angle at which first order reflection will occur when X-ray of wavelength $1.54A^{\large\circ}$ are diffracted by the atoms of a crystal ; the interplanar distance is $4.04A^{\large\circ}$

asked Feb 27, 2014 by sharmaaparna1

1 answer

Increasing order of stability among the three main conformation (ie eclipse, anti, gauche) of 2- fluoroethanol is

asked Feb 26, 2014 by meena.p

1 answer

The below reaction with (i) $NH_3,H_2O$,(ii) acid HCl respectively give

asked Feb 25, 2014 by sreemathi.v

1 answer

The Edison storage cell is represented as $Fe(s)/FeO(s)/KOH(aq)/Ni_2O_3(s)/Ni(s)$.

asked Feb 18, 2014 by sreemathi.v

1 answer

12.2gm of benzonic acid (M=122) in 100gm benzene has depression in freezing point $2.6^{\large\circ}C$; $K_f = 5.2 ^{\circ} mol^{-1}kg$. If there is 100% polymerization, the number of molecules of benzonic acid in associated state is

asked Feb 14, 2014 by sreemathi.v

1 answer

Solve: $\large\frac{dy}{dx}=\frac{-\sqrt {1-y^2}}{x-e^{\Large\sin ^{-1}y}}$

asked Feb 7, 2014 by meena.p

1 answer

Find the maximum area of $\Delta PSS'$ for the ellipse $\large\frac{x^2}{36}+\frac{y^2}{16}$$=1$ where S,S' are foci & P is any point on ellipse?

asked Feb 7, 2014 by sreemathi.v

1 answer

The one which is the measure of the central tendency is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

When a solid with a band gap has a donor level just below its empty energy band, its solid is

asked Jan 31, 2014 by meena.p

1 answer

Yellow phosphorous on reaction with $Ca(OH)_2$ gives

asked Jan 28, 2014 by sreemathi.v

1 answer

The volume strength of ion $H_2O_2$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$NO+O_3\rightarrow O_2,O_3+hv\rightarrow x+y,NO_2+O\rightarrow z + x$.Net reaction :$A(O_3)+hv\rightarrow BO_2$.The $x$ and $y$ are

asked Jan 22, 2014 by sreemathi.v

1 answer

The number of terms in the AP a, b,....c is

asked Jan 17, 2014 by yamini.v

1 answer

Electromagnetic radiations of wavelength 242nm is just sufficient to ionize sodium atom.Calculate the ionization energy of sodium in KJ/mol.

asked Jan 15, 2014 by sreemathi.v

1 answer

If $P(2,3,4)\;and\:Q(1,b,1)$ are two points and $O$ is origin such that $OP$ is $\perp$ to $OQ$, then $b=?$

asked Jan 10, 2014 by rvidyagovindarajan_1

1 answer

If $f(x)=\large\frac{x^2-10x+25}{x^2-7x+10}$ for $x\neq 5$ and $f$ is continuous at $x=5$ then $f(5)=$

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int x \sec ^2x^2 .dx$

asked Dec 19, 2013 by meena.p

1 answer

The stability of carbanions in the following :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Nector is converted into honey in the

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a\:and\:\overrightarrow b$ are two non collinear unit vectors and $\overrightarrow u=\overrightarrow a-(\overrightarrow a.\overrightarrow b)\overrightarrow b\:\:and\:\:\overrightarrow v=\overrightarrow a\times\overrightarrow b$, then $|\overrightarrow v|=?$

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

The Ova of Pheretima are released through a pore present on the

asked Dec 5, 2013 by thanvigandhi_1

0 answers

Which of the following is Lucus reagent?

asked Nov 29, 2013 by sreemathi.v

1 answer

When solid lead iodide is added to water, the equilibrium concentration of $I^-$ becomes $2.6 \times 10^{-3}$M. What is the $K_{sp}$ for $PbI_2$

asked Nov 27, 2013 by mosymeow_1

1 answer

An example of scyphozoa is :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

PQR is a right angled triangular plate of uniform thickness as shown in the figure. If $ I_1, I_2 \: and \: I_3$ are moments of Inertia about PQ, QR and PR axes respectively, then :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

A magnet of length 10 cm and magnetic moment $1 Am^2$ is placed along the side AB of an equilateral triangle ABC. If the length of sides AB is 10 cm, the magnetic induction at point C is :

asked Nov 1, 2013 by thanvigandhi_1

2 answers

The vapour density of a mixture containing $NO_2$ and $N_2O_4$ is 38.3 at $27^{\large\circ}C$.Calculate the mole of $NO_2$ in 100g mixture

asked Oct 30, 2013 by sreemathi.v

1 answer

A 3 kg sphere makes an inelastic collision with another sphere at rest and they stick together after collision. After collision, the composite mass moves with a speed of $ \bigg( \large\frac{1}{4} \bigg)^{th}$ of the initial velocity of 3 kg sphere. The mass of second sphere is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

A steel wire can withstand a load up to 2940 N. A load of 150 kg. is suspended from a rigid support. The maximum angle through which the wire cam be displaced from the mcan position, so that the wire does not break when the load passes through the position of equilibrium, is

asked Oct 18, 2013 by meena.p

1 answer

Evaluate $40^{\large\circ}30'$

asked Oct 11, 2013 by sreemathi.v

1 answer

If the ratio of lengths, radii and Young's moduli of steel and brass wires shown in the figure are a,b and c respectively, the ratio between the increase in lengths of brass and steel wires would be :

asked Oct 11, 2013 by meena.p

0 answers

A parallel plate capacitor with a dielectric slab with a dielectric constant 3 filling the space betwen the plates is charged to a potential V. The battery is then disconnected and the dielectric slab is withdrawn. It is then replaced with another dielectric slab of dielectric constant 2. If the energies stored in the capacitor before and after the dielectric slab is changed are $E_1\: and E_2$, then $E_1 / E_2$ are

asked Oct 9, 2013 by thanvigandhi_1

1 answer

The moment of inertia of a disc, of mass M and radius R, about an axis which is a tangent and to its diameter is :

asked Sep 30, 2013 by meena.p

1 answer

The maximum tension a rope can withstand is $6\;kg$ wt. The ratio of maximum acceleration with two boys of masses $20\; kg$ can climb up rope at the same time is :

asked Sep 24, 2013 by meena.p

1 answer

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