Recent questions tagged q87

What is unit of magnetic permeability ?

asked Aug 3, 2015 by meena.p

1 answer

A magnetized steel wire $31.4\;cm$ long has pole strength of $0.2 \;Am$ It is then bent in the form of a semicircle. Calculate the magnetic moment of the needle.

asked Jul 21, 2015 by meena.p

1 answer

Given resistance of $1 \Omega, 2 \Omega$ and $3 \Omega$ how will we combined them to get an equivalent resistance of $\large\frac{6}{11}$$ \Omega$

asked Jul 3, 2015 by meena.p

1 answer

A paisa coin is made up of Al-my alloy and weights $0.75\;g$ It has a square shape and its diagonal measures $17\;mm$ It is electrically neutral and contains equal amounts of positive and negative charges. Treating the paisa coins made up only $Al$, find the magnitude of equal number of positive and negative charges. What conclusion do you draw from this magnitude ?

asked Apr 29, 2015 by meena.p

1 answer

Which one is classified as a condensation polymer?

asked Apr 7, 2014 by sreemathi.v

1 answer

RNA and DNA are chiral molecules, their chirality is due to

asked Mar 30, 2014 by thanvigandhi_1

1 answer

A sample of Ar gas at 1 atm pressure and $27^{\circ}C$ expands reversibly and adiabatically from $1.25\: dm^3\: to\: 2.5\: dm^3$. Calculate enthalpy change of this process. $CV$ for argon is $ 12.4\: kJ/mol$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The blast furnace used for smelting is provided with double cup and cone arrangement to

asked Mar 20, 2014 by meena.p

1 answer

Formation of polythene from calcium carbide takes place as \[\] $ CaC_2+2H_2O \rightarrow Ca(OH)_2+C_2H_2$ \[\] $ C_2H_2+H_2 \rightarrow C_2H_4$ \[\] $ nC_2H_4 \rightarrow (- CH_2 - CH_2 -)n$ \[\] The amount of polythene obtained from 64.1 kg of $CaC_2$ is

asked Mar 12, 2014 by thanvigandhi_1

1 answer

Bordcaux mixture is used as fungicide its composition is

asked Mar 12, 2014 by meena.p

1 answer

According to MO theory,which of the following statement is correct?

asked Mar 7, 2014 by sreemathi.v

1 answer

A parallel plate capacitor as shown in the figure is made of circular plates each of radius $R = 6\: cm$, and it has a capacitance $C = 100\: pF$. The capacitor is connected to a $230\: V$ ac supply with a frequency of 300 rad/s. The amplitude $B$ at a point $3\: cm$ from the axis between the plates is

asked Mar 4, 2014 by thanvigandhi_1

1 answer

Which of the following is the correct order of decreasing $SN_2$ reactivity :

asked Feb 26, 2014 by meena.p

1 answer

Which of the following is the major product of the reaction shown below

asked Feb 25, 2014 by sreemathi.v

1 answer

The voltage of cell given is -0.46V $Pt/H_2$(atm)/$NaHSO_3(0.4M),Na_2SO_3(6.44\times 10^{-3}M)\parallel Zn^{+2}(0.3M)/Zn(g)$.Also $Zn^{+2}+2e^-\rightarrow Zn(s) \leftrightharpoons E^0=-0.763$V.Then the value of $K_2=\large\frac{[H^+][SO_3^{-2}]}{[HSO_3^-]}$

asked Feb 18, 2014 by sreemathi.v

1 answer

The 2.56gm of sulphur in 100gm of $CS_2$ has depression in freezing point of $0.010^{\large\circ}$C. $K_f=0.1^{\large\circ}C$/molal. Hence atomicity of sulphur in $CS_2$

asked Feb 14, 2014 by sreemathi.v

1 answer

Find general solution of equation $y'-2y+a=0$ a=fixed

asked Feb 7, 2014 by meena.p

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Find the common tangent of $x^2+y^2=4$ and $2x^2+y^2=2$.

asked Feb 7, 2014 by sreemathi.v

1 answer

Median of $ ^{2n}C_0, ^{2n}C_1, ^{2n}C_2, ^{2n}C_3...... ^{2n}C_n$ ( where n is even ) is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

In Boolean Algebra what is value of $A.B+A.C.B$

asked Jan 31, 2014 by meena.p

1 answer

The most active metal is

asked Jan 28, 2014 by sreemathi.v

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Which one of the following reactions does not form gaseous product?

asked Jan 24, 2014 by sreemathi.v

1 answer

$CO_2+H_2O\rightarrow x$.The $x$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

If three numbers are in GP, then their logarithms will be in

asked Jan 17, 2014 by yamini.v

1 answer

The ionization energy of H atom is $13.6eV$.What will be ionization energy of $He^+$ and $Li^{2+}$ ions?

asked Jan 15, 2014 by sreemathi.v

1 answer

If the plane $x-2y+3z=0$ is rotated through a right angle about its line of intersection with the plane $2x+3y-4z-5=0$, then the eqn. of the plane in its new position is ?

asked Jan 9, 2014 by rvidyagovindarajan_1

1 answer

If $\lim\limits_{x\to k}\large\frac{x^k-5^k}{x-5}$$=500$ then positive value of k is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $\int \large\frac{(1-2x^2)^2}{x^{3/2}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

A strong base can abstract an $ \alpha$ - hydrogen from :

asked Dec 17, 2013 by thanvigandhi_1

1 answer

Phaeosome in earthworm is a :

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are unit vectors, then the maximum value of $|\overrightarrow a-\overrightarrow b|^2+|\overrightarrow b-\overrightarrow c|^2+|\overrightarrow c-\overrightarrow a|^2$ is ?

asked Dec 7, 2013 by rvidyagovindarajan_1

1 answer

The function of Pheretima is

asked Dec 5, 2013 by thanvigandhi_1

0 answers

Which of the following is used in the preparation of generated water (soda)?

asked Nov 29, 2013 by sreemathi.v

1 answer

The rapid change of $pH$ near the stoichiometric point of an acid-base titration is the basis of indicator detection. $pH$ of the solution is related to ratio of the concentration of the conjugated acid(HIn) and base (In) form of the indicator by the expression

asked Nov 27, 2013 by mosymeow_1

1 answer

An example of the group which is considered as blind ally in animal kingdom is :

asked Nov 27, 2013 by thanvigandhi_1

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Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when the velocity of A is V and that of B is 2 V , the velocity of centre of mass of the system is :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

When a light of wavelength 4000 A in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is 200. Find the thickness, if refractive indices of diamond and water are $ \large\frac{5}{2}\: and \: \large\frac{4}{3}$ respectively :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

How many moles of electron weigh one kilogram ?

asked Oct 30, 2013 by sreemathi.v

1 answer

A ball at rest is dropped freely from a height of 20 m. It loses 30% of its energy on striking the ground and bounces back. The height to which it bounces back is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

Two particles A and B initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of A is 'v' and speed of B is '2v', the speed of centre of mass (c.m) is

asked Oct 18, 2013 by meena.p

1 answer

If $\cot(\cos^{-1}x)=\sec\big[\tan^{-1}\large\frac{a}{\sqrt{b^2-a^2}}\big]$ then $x$ is equal to

asked Oct 11, 2013 by sreemathi.v

1 answer

A body is projected vertically upwards from the surface of the earth with a velocity equal to half the escape velocity. If R is the radius of the earth , maximum height attained by the body from the surface of the earth is :

asked Oct 11, 2013 by meena.p

1 answer

A short magnet of magnetic moment M, is placed on a straight line. The ratio of magnetic induction fields $B_1, B_3, B_3$ values on this line at points which are at distances 30 cm , 60 cm and 90 cm respectively from the center of the magnet is

asked Oct 8, 2013 by thanvigandhi_1

1 answer

A ball falls from a height h and rebounds after striking the floor. The coefficient of restitution is $e$. The maximum distance covered before it comes to rest is :

asked Sep 30, 2013 by meena.p

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