Recent questions tagged q88

Why do use soft iron to make electromagnets?

asked Aug 4, 2015 by meena.p

1 answer

What is the relation between relative permeability and susceptibility

asked Aug 4, 2015 by meena.p

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Two identical thin bar magnets, each of length L and pole strength m are placed at right angles to each other, with the north pole of one touching the south pole of the other . Find the magnetic moment of the system.

asked Jul 21, 2015 by meena.p

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Determine equivalent resistance of network shows in the figure.

asked Jul 7, 2015 by meena.p

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Among the following oxoacids, the correct decreasing order of acid strength is

asked Apr 7, 2014 by sreemathi.v

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In DNA, a complimentary bases are

asked Mar 31, 2014 by thanvigandhi_1

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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 A$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Which of the following polymers can be used for lubrication and as an insulator?

asked Mar 12, 2014 by thanvigandhi_1

1 answer

In $K_2Cr_2O_7$ every $C_r$ is linked to

asked Mar 12, 2014 by meena.p

1 answer

In an anti-bonding molecular orbital,electron density is minimum

asked Mar 7, 2014 by sreemathi.v

1 answer

For $(i) I^-, (ii) Cl^{-}, (iii) Br^{-} $. The increasing order of nuclephilicity would be :

asked Feb 26, 2014 by meena.p

1 answer

In the following reaction the structure of the major product X is

asked Feb 25, 2014 by sreemathi.v

1 answer

$H_2O_2$ can be prepared by successive reactions

asked Feb 18, 2014 by sreemathi.v

1 answer

The van't Hoff factor of $CH_3COOH$ is less than unity. It indicates that the acetic acid

asked Feb 14, 2014 by sreemathi.v

1 answer

Solve : $y''+e^{2y}(y')^3=0$

asked Feb 7, 2014 by meena.p

1 answer

Find the equation of chord of contact of tangents drawn from a point $(x_1,y_1)$ to the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$.

asked Feb 7, 2014 by sreemathi.v

1 answer

Lines of regression of $y$ on $x$ and $x$ on $y$ are respectively $y=ax+b$ and $x=\alpha y+ \beta$. If mean of $x$ and $y$ series is same then its value is

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Functions of rectifier is

asked Jan 31, 2014 by meena.p

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Which of the following logic gate is an universal gate

asked Jan 31, 2014 by meena.p

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Which of the following is the strongest reducing agent?

asked Jan 28, 2014 by sreemathi.v

1 answer

The wrong state in the below about $H_2O_2$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

The name of the $H_2CO_3$ acid is and it is ?

asked Jan 22, 2014 by sreemathi.v

1 answer

A train travels from A to B at speed of x km/hour and from B to A at speed of y km/hour. The average speed of the train from A to B and back to A, would be calculated by the

asked Jan 17, 2014 by yamini.v

1 answer

The ionization energy of $He^+$ is $19.6\times 10^{-18}J/atom$.Calculate the energy of first stationary state of $Li^{2+}$

asked Jan 15, 2014 by sreemathi.v

1 answer

The point which divides the line joining the points $(2,4,5)\:\:and\:\:(3,5,-4)$ in the ratio $2:3$ externaly lies on the plane?

asked Jan 10, 2014 by rvidyagovindarajan_1

1 answer

$\lim\limits_{x\to \large\frac{\pi}{4}}\big(\large\frac{1-\tan x}{1\sqrt 2\sin x}\big)$=

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate: $\int \large\frac{\Large e^{\tan ^{-1}(m)}}{1+m^2}$$.dm$

asked Dec 19, 2013 by meena.p

1 answer

How many stereoisomers does this molecule have ? $ CH_3CH=CHCH_2CHBrCH_3$

asked Dec 17, 2013 by thanvigandhi_1

0 answers

The silicates consumed along with food by Pheretima are excreted by :

asked Dec 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow v=2\hat i+\hat j-\hat k, \:\:and\:\:\overrightarrow w=\hat i+3\hat k\:\:and\:\:\overrightarrow u$ is a unit vector, then the maximum value of $[\overrightarrow u\:\overrightarrow v\:\overrightarrow w]=?$

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

Spermatophores of Pheretima are formed due to the secretions of

asked Dec 5, 2013 by thanvigandhi_1

0 answers

In which of the following $H_2O_2$ acts as reducing agent?

asked Nov 29, 2013 by sreemathi.v

1 answer

What is the correct relationship between the $pH$s of isomolar solutions of sodium oxide ($pH_1$), sodium sulphide ($pH_2$), sodium selenide ($pH_3$) and sodium telluride ($pH_4$)?

asked Nov 27, 2013 by mosymeow_1

1 answer

The cnidoblasts used during looping movement in Hydra are :

asked Nov 27, 2013 by thanvigandhi_1

0 answers

A car is travelling along a curved road of radius r. If the coefficient of friction between the tyres and the road is $ /mu$ , the car will skid if its speed exceeds :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

Two polarizers have their axis inclined at $ 45^{\circ}$ to each other. If unpolarized light of intensity $I_{\circ}$ is incident on the first polarizer , then the intensity transmitted light through second polarizer is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

$H_2O_2$ is marked 22.4 volume.How much of it is required to oxidize 3.5g $H_2S$ gas ?

asked Oct 30, 2013 by sreemathi.v

1 answer

The apparent weight of a person in a lift moving downwards is half his apparent weight in the same lift moving upwards with the same acceleration. Acceleration of the lift is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

Starting from rest, the time taken by a body sliding down on a rough inclined plane at $45^{\circ}$ with the horizontal is, twice the time taken to travel on a smooth plane of same inclination and same distance. Then the coefficient of kinetic friction is

asked Oct 18, 2013 by meena.p

0 answers

If $x_1=2\tan^{-1}\big(\large\frac{1+x}{1-x}\big)$$,x_2=\sin^{-1}\big[\large\frac{1-x^2}{1+x^2}\big]$ where $x\in(0,1)$ then $x_1+x_2$ is equal to

asked Oct 11, 2013 by sreemathi.v

1 answer

The displacement of a particle executing SHM is given by : $y= 5 \sin \bigg(4t+\large\frac{\pi}{3}\bigg).$ If T is the time period and the mass of the particle is $2 gms$, the kinetic energy of the particle when $t= \large\frac{T}{4}$ is given by :

asked Oct 11, 2013 by meena.p

1 answer

Two capacitors having capacitances $C_1\: and \: C_2$ are charged with 120 V and 200 V batteries respectively. When they are connected in parallel now, it is found that the potential on each one of them is zero. Then

asked Oct 9, 2013 by thanvigandhi_1

1 answer

An object takes n times as much as to slide down a $45^{\circ}$ rough inclined plane as it takes to slide down a perfectly smooth inclined plane of the same inclination. The coefficient of kinetic friction between the object and the rough incline is given by :

asked Sep 30, 2013 by meena.p

1 answer

$A I N$ pendulum bob is held at an angle $\theta$ from the vertical by a $2\;N$ horizontal force $\overrightarrow {F}$ as shown in figure. The tension in the string supporting the pendulum bob (in Newtons) is

asked Sep 24, 2013 by meena.p

1 answer

The upper half of an inclined plane with an angle of inclination $\phi$, is smooth while the lower half is rough. A body starting from rest at the top of the inclined plane comes to rest at the bottom of the inclined plane. Then the coefficient of friction for the lower half is

asked Sep 17, 2013 by meena.p

1 answer

The density of case of a planet is $s_1$ and that of the outer shell is $s_2$.The radius of case and that of the planet are R and 2R respectively. Gravitational acceleration at the surface of the planet is same as at a depth R. Find $\large\frac{s_1}{s_2}$

asked Aug 29, 2013 by meena.p

1 answer

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