Recent questions tagged q90

Why do we prefer the along alnico for making permanent magnets.

asked Aug 4, 2015 by meena.p

1 answer

In a tangent galvanometer , When a current of $10\;mA$ is passed the deflection is $31^{\circ}$ By what percentage , the current has to be increased , so as to produce a deflection of $42^{\circ}$?

asked Jul 22, 2015 by meena.p

1 answer

The adjacent fig shows a $2.0 \;V$ potentiometer used for the determined of internal resistance of a cell $1.5 \;v$ cell. The balance point of the cell is open circuit is $76.3 \;cm$ . When a resistor of $9.5 \Omega$ is used in the external circuit of the cell, the balance point shifts to $6.48 \;cm$ length of the wire . Determine the internal resistance of the cell

asked Jul 7, 2015 by meena.p

1 answer

The most suitable reagent for the conversion of $R-CH_2 -OH\rightarrow R-CHO$ is

asked Apr 7, 2014 by sreemathi.v

1 answer

$ \alpha$-D (+)-glucose and $\beta$-D(+)-glucose are

asked Mar 31, 2014 by thanvigandhi_1

1 answer

Two moles of a perfect gas undergoes following processes: \[\] 1. A reversible isobaric expansion from (1 atm, 20L) to (1 atm, 40L)\[\] 2. A reversible isochoric change of state from (1 atm, 40L) to (0.5 atm, 40L)\[\] 3. A reversible isothermal compression from (0.5 atm, 40L) to (1atm, 20L)\[\] Calculate the total work done involved in the above processes

asked Mar 20, 2014 by thanvigandhi_1

1 answer

In Ellingham diagram, a straight line is obtained except

asked Mar 20, 2014 by meena.p

1 answer

Corrosive sublimate is

asked Mar 13, 2014 by meena.p

1 answer

Chain transfer reagent is

asked Mar 12, 2014 by thanvigandhi_1

1 answer

Which of the following molecule has the lowest dipolemoment?

asked Mar 7, 2014 by sreemathi.v

1 answer

A match box exhibits :

asked Feb 27, 2014 by sharmaaparna1

1 answer

The most unlikely representation of resonance structure of P-nitrophenoxide ion is

asked Feb 26, 2014 by meena.p

1 answer

The two cleavage reactions are given below :

asked Feb 25, 2014 by sreemathi.v

1 answer

The Edison storage cell is represented as $Fe(s)/FeO(s)/KOH(aq)/Ni_2O_3(s)/Ni(s)$.The half cell reactions are $Ni_2O_3(s)+H_2O(l)+2e^-\rightarrow 2NiO(s)+2OH^-(aq)\Rightarrow E^0=0.4V$,$FeO(s)+H_2O(l)+2e^-\rightarrow Fe(s)+2OH^-(aq)\Rightarrow E^0=-0.87.V$.What will be the maximum amount of electrical energy that can be obtained from one mole of $Ni_2O_3$

asked Feb 18, 2014 by sreemathi.v

1 answer

Relative decrease in vapour pressure of an aqueous glucose dilute solution is found to be 0.018.What is the elevation in boiling point? (Given 1 molal aq.glucose solution boils at 100.62$^{\large\circ}C$ at 1 atm.pressure)

asked Feb 14, 2014 by sreemathi.v

1 answer

Solve: $(3xy+y^2)dx+(x^2+xy)dy=0 \qquad y(1)=1$

asked Feb 7, 2014 by meena.p

1 answer

Find the value of p for which $e=\large\frac{1}{2}$ where ellipse is $\large\frac{x^2}{4}+\frac{y^2}{p^2}$$=1$?

asked Feb 7, 2014 by sreemathi.v

1 answer

If SD of 15 items is 6 and each item is decreased by 1, find the SD of the new set.

asked Jan 31, 2014 by thanvigandhi_1

1 answer

To make a full wave rectifier using these four diodes, the ac input should be applied across what?

asked Jan 31, 2014 by meena.p

1 answer

The pair of amphoteric hydroxides is :

asked Jan 29, 2014 by sreemathi.v

1 answer

$KIO_4$ is reduced to $KIO_4+H_2O_2\rightarrow $____________

asked Jan 24, 2014 by sreemathi.v

1 answer

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

asked Jan 22, 2014 by sreemathi.v

1 answer

The sum of n terms of two APs is in the ratio$\; 5n + 1: 4n+10$. Find the ratio of their $\;5^{th}$ terms.

asked Jan 18, 2014 by yamini.v

1 answer

Calculate the frequency of the spectral line emitted when the electron in n=3 in H-atom de-excites to ground state.$(R_H=109737/cm)$

asked Jan 15, 2014 by sreemathi.v

1 answer

A line segment of length $21$ has $d.r.=(2,-3,6)$ and makes obtuse angle with $x\:axis$, then the components of the line segment (vector) are?

asked Jan 10, 2014 by rvidyagovindarajan_1

1 answer

$\lim\limits_{x\to \large\frac{\pi}{4}}\large\frac{\cos x-\sin x}{(\Large\frac{\pi}{4}-\normalsize x)(\large\cos x+\sin x)}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \sqrt{\sin ^3 x}. \cos x \;dx$

asked Dec 19, 2013 by meena.p

1 answer

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of :

asked Dec 17, 2013 by thanvigandhi_1

0 answers

Dermatobiasis of cattle is caused by :

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are two unit vectors such that $\overrightarrow a+2\overrightarrow b\:\:and\:\:5\overrightarrow a-4\overrightarrow b$ are $\perp$ to each other, then the angle between $\overrightarrow a\:\:and\:\:\overrightarrow b$ is?

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

External segmentation is absent in one of the following

asked Dec 5, 2013 by thanvigandhi_1

0 answers

Chloroethane reacts with $X$ to form diethyl Either.What is $X$?

asked Nov 29, 2013 by sreemathi.v

1 answer

Equal volume of the follwing $Ca^{2+}$ and $F^-$ solutions are mixed. In which of the follwing solutions will precipitation occur?

asked Nov 27, 2013 by mosymeow_1

1 answer

An acoelomate with protandrous condition is :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

The radius of gyration of a solid sphere of radius R about a certain axes is also equal to R. If r is the distance between the axes and the centre of a sphere , then r is equal to

asked Nov 16, 2013 by thanvigandhi_1

1 answer

Match the following physical quantities with their respective dimensional formula :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Calculate molecules of methane,C and H atoms in 25g methane

asked Oct 30, 2013 by sreemathi.v

1 answer

Two particles of mass 1 kg and 3 kg have position vectors $ 2 \overrightarrow i + 3\overrightarrow j+4\overrightarrow k \: and \: -2\overrightarrow i+3\overrightarrow j-4\overrightarrow k$ respectively. The position vector of centre of mass of the system is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

The moment of inertia of a thin circular disc about an axis passing through its centre and perpendicular to its diameter and touching the edge of the rim is

asked Oct 18, 2013 by meena.p

2 answers

The angles of a triangle are in the ratio 3 : 4 : 5.Find the smallest angle in degrees and the greatest angle in radians

asked Oct 11, 2013 by sreemathi.v

1 answer

A soap bubble of radius r is blown up to from a bubble of radius 2r under isothermal conditions. If T is the surface tension of soap solution, the energy spent in the blowing :

asked Oct 11, 2013 by meena.p

1 answer

Copper and carbon wires are connected in series and the combined resister is kept at $0^{\circ} C$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ}C$ is ( Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} / ^{\circ}C\: and \: -0.5 \times 10^{-3}/^{\circ}C$)

asked Oct 9, 2013 by thanvigandhi_1

1 answer

A fly -wheel of mass 25 kg has a radius of $0.2\;m$. It is making 240 rpm. What is the torque necessary to bring to rest in 20 sec?

asked Sep 30, 2013 by meena.p

1 answer

A ball is let fall from a height $h_0$. It makes n collisions with the earth. After $'n'$ collisions it rebounds with a velocity $;v_n'$ and the ball rises to a height $h_n$ then coefficient of restitution, is given by

asked Sep 24, 2013 by meena.p

1 answer

A uniform circular disc of radius R, lying on a friction less horizontal plane is rotating with an angular velocity $\omega$ about its own axis. Another identical circular disc is gently placed on the top of the first disc coaxially. The loss in rotational kinetic energy due to friction between the two discs, as they acquire common angular velocity is (I is moment of inertia of the disc)

asked Sep 17, 2013 by meena.p

1 answer

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