Recent questions tagged q95

A galvanometer with a coil resistance $12.0 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How it can be converted into an ammeter of range $7.5 \;A$ What will be resistance of ammeter formed ?

asked Aug 4, 2015 by meena.p

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The small angle between magnetic axis and geographic axis at a place is called _________ at that place .

asked Jul 22, 2015 by meena.p

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Which of the following : characteristic of electrons . determines the current in a conductor ?

asked Jul 3, 2015 by meena.p

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The 2 functional groups present in typical carbohydrate are

asked Mar 31, 2014 by thanvigandhi_1

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S1: For the process to be spontaneous, both $ \Delta G$ as well as $ \Delta S$ has to be less than zero.\[\] S2: For spontaneous change, $ \Delta S_{Total} > 0.$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The collectors like pine oil xanthates and fatty acids are used during froth-flotation process of concentration of ores to

asked Mar 20, 2014 by meena.p

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The Compound which is used in preservation of wood is :

asked Mar 13, 2014 by meena.p

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Which of the following are biopolymers?

asked Mar 12, 2014 by thanvigandhi_1

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According to VSEPR theory,which of the following is the incorrect statement?

asked Mar 7, 2014 by sreemathi.v

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According to electromagnetic wave theory, the electric and magnetic field vector associated with the wave is given by \[\] $|E| = E_{max} \cos(kx – \omega t)$ \[\] $|B| = B_{max} \cos(kx – \omega t)$ \[\] The energy of electromagnetic wave is confined in the form of electric and magnetic fields. The energy per unit volume in an electric field is given by $U_E = \large\frac{1}{2} \in_oE^2$ and the energy per unit volume in a magnetic field is given by $ U_M =\large\frac{1}{2} B^2/ \mu_0$ . The energy density associated with the magnetic field is equal to the energy density associated with the electric field. The total energy is equally shared by the electromagnetic as well as magnetic field. The rate of flow of energy in an electromagnetic wave is defined as pointing vector $S = 1/\mu_o (E \times B)$. A plane electromagnetic wave varies sinusoidally at $90\: MHz $ as it travels along the $+ve\: x$ direction. The peak value of the electric field is $2\: millivolt/m$ and it is directed along $ \pm y$ direction \[\] The magnetic field vector as a function of time$(t)$ and space$(x)$ is

asked Mar 5, 2014 by thanvigandhi_1

1 answer

Ketanol tautomerism refers to a chemical equilibrium between a keto form (a ketone or an aldehyde) and an enol. The enol and keto fprms are said to be tatutomers of each other. The interconversion of the two forms involved the movements of a proton and the shifting of bonding electrons. A compound containing a carbonyl group $(C=0)$ is normally in rapid equilibrium with an enol tautomer, which contains a pair of doubly bonded carbon atoms adjacent to a hydroxyl $(-OH)$ group, $C=C-OH$ For a carbonyl compound to exhibit tautomerism, the essential condition is that, it must have at least one $ \alpha -H$ atom. Generally , the keto form is more stable than the enol form due to the greater strength of the carbon- oxygen $\pi$ bond as compared - carbon $\pi$ bond. In keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto- form , this is due toMaximum enol content is observed in

asked Feb 27, 2014 by meena.p

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The correct acid strength order of the compounds

asked Feb 26, 2014 by sreemathi.v

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Solve : $y'= 1+y^2$

asked Feb 7, 2014 by meena.p

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Find the locus of feet of perpendicular from the foci on and tangent to an ellipse?

asked Feb 7, 2014 by sreemathi.v

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In extrinsic semiconductors

asked Jan 31, 2014 by meena.p

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Halides (Cl,Br and I) of alkaline earth metal which cannot be dehydrated by heating is (are)

asked Jan 29, 2014 by sreemathi.v

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Reducing nature of $H_2O_2:H_2O_2\rightarrow x+y+z$.The $x$ and $y$ are

asked Jan 24, 2014 by sreemathi.v

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$CF_2Cl_2+hv\rightarrow CF_2Cl+A,CFCl_3+hv\rightarrow CFCl_2+B$. Which of the following is B?

asked Jan 22, 2014 by sreemathi.v

1 answer

If the $\;10^{th}\;$ term of a $GP$ is $9$ and the $\;4^{th}\;$ term is $4$, then the $\;7^{th} \;$term is

asked Jan 19, 2014 by yamini.v

1 answer

Find out the number of waves made by a Bohr electron in one complete revolution in its third orbit

asked Jan 15, 2014 by sreemathi.v

1 answer

If from a point $P(a,b,c)$ perpendiculars $PA,\:PB,\:$ are drawn on $yz\:\:and\:\:zx$ planes. then the equation of the plane $OAB$ is ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

$\lim\limits_{x\to a}\large\frac{\log(x-a)}{\log(e^x-e^a)}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $ \int \sin ^3 x .dx$

asked Dec 19, 2013 by meena.p

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An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67% . Th empirical formula of the compound would be :

asked Dec 18, 2013 by thanvigandhi_1

1 answer

Silicosis is caused by

asked Dec 11, 2013 by thanvigandhi_1

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If $\overrightarrow a+2\overrightarrow b+3\overrightarrow c=\overrightarrow 0$, then $\overrightarrow a\times\overrightarrow b+\overrightarrow b\times\overrightarrow c+\overrightarrow c\times\overrightarrow a=?$

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

Coelome in cockroach is

asked Dec 5, 2013 by thanvigandhi_1

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$\Rightarrow A\overset{HBr}{\rightarrow}C_2H_5Br\overset{B}{\rightarrow}A$.B is

asked Nov 29, 2013 by sreemathi.v

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The $pH$ of $\frac{M}{100}$ NaOH solution is:

asked Nov 27, 2013 by mosymeow_1

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Which one of the following is a molluscan larva ?

asked Nov 27, 2013 by thanvigandhi_1

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A tank of height 5 m is full of water. There is a hole of cross sectional area $1\: cm^2$ in its bottom. The value of water that will come out from this hole per second is ($ g = 10 m/s^2$)

asked Nov 16, 2013 by thanvigandhi_1

1 answer

Solve for $x$: $\tan^{-1}x+2\cot^{-1}x=\large\frac{2\pi}{3}$.

asked Nov 15, 2013 by sreemathi.v

1 answer

A shell is fired from a cannon with a velocity 'v' at an angle $ '\theta'$ with the horizontal. At the highest point in its path it explodes into two pieces of equal masses. One of the pieces retraces its path and reaches the cannon. Then the velocity of the other piece immediately after collision is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

What is the purity of conc $H_2SO_4$ solution (specific gravity 1.8g/ml),if 5ml of this solution is neutralized by 84.6ml of $2.0N\;NaOH$

asked Oct 31, 2013 by sreemathi.v

1 answer

A mass is suspended from the end of a spring. When the system is oscillating the amplitude of oscillation is 4 cm and the maximum kinetic energy of oscillation of the system is 1 joule. Then the force constant of the spring is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

Two rain drops reach the Earth different terminal velocities having ratio $9:4$. Then the ratio of their volume is

asked Oct 18, 2013 by meena.p

1 answer

An ideal gas is subjected to a cyclic process involving four thermodynamic states; the amounts of heat (Q) and work (W) involved in each of these stated are :$Q_1=6000\;J,Q_2=-5500; Q_3=-3000\;Q_4=3500\;J: W_1=2500\;J;W_2=-1000\;J;W_3=-1200\;J;W_4=xJ$. The ratio of the net work done by the gas to the total heat absorbed by the gas is $'\eta$. The values of x and $\eta$ respectively are:

asked Oct 11, 2013 by meena.p

1 answer

A balloon starting from rest ascends vertically with uniform acceleration to a height of 100 m in 10 sec. The force on the bottom of the balloon by a mass of 50 kg is $( g=10\: ms^{-2})$

asked Oct 9, 2013 by thanvigandhi_1

1 answer

Water from a tap emerges vertically downwards with initial velocity $4\;ms^{-1}$. The cross- sectional area of the tap is A. The flow is steady and pressure is constant throughout the stream of water. The distance h vertically below the tap, where the cross- sectional area of the stream becomes $\bigg(\large\frac{2}{3}\bigg)A,$ is $(g=10\; m/s^2)$:

asked Sep 30, 2013 by meena.p

1 answer

$\mathbf{Assertion\; (A)}$: An astronaut inside a massive spaceship orbiting around the earth will experience a finite but small gravitational force.$\mathbf{Reason\;(R):}$ The centripetal force necessary to keep the spaceship in orbit around the earth is provided by the gravitational force between the earth and the spaceship.

asked Sep 24, 2013 by meena.p

1 answer

The terminal velocity of a liquid drop of radius 'r' falling through air is v. If two such drops are combined to form a bigger drop, the terminal velocity with which the bigger drop falls through air is ( Ignore any buoyant force due to air)

asked Sep 17, 2013 by meena.p

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The acceleration due to gravity on moon is only one sixth that of earth. If the earth and moon are assumed to have same densities the ratio of radii of moon and earth will be

asked Aug 29, 2013 by meena.p

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If momentum of boby increases by $0.01 %$ its kinetic energy will increase by

asked Aug 8, 2013 by meena.p

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A monkey of mass $20\; kg$ is holding a vertical rope. The rope will not break when mass of $25\; kg$ is suspended from it. but will break if the mass exceeds $25\; kg$. what is the accelerations (maximum) with which the monkey can climb up along the rope. $(g=10 m/s^2)$

asked Jul 15, 2013 by meena.p

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The differential equation satisfied by all the straight lines in $xy$ plane is

asked May 23, 2013 by poojasapani_1

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The angle between the two tangents drawn from the point $(-4 , 4)$ to $y^{2}=16x $ is

asked May 13, 2013 by poojasapani_1

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