Recent questions tagged q92

The ratio of the stunt resistance and the resistance of a galvanometer is $ 1,499$. If the full scale deflection current of the galvanometer is $2 \;mA$ then the range of ammeter is

asked Aug 4, 2015 by meena.p

1 answer

If $\lambda$ is the magnetic latitude at a place, then what is the relation between the angle of dip and $\lambda$ magnetic latitude .

asked Jul 22, 2015 by meena.p

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Electric field due to an electric dipole is

asked Jul 8, 2015 by meena.p

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Which of the following vitamin is oil soluble?

asked Mar 31, 2014 by thanvigandhi_1

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$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$.The $y$ is

asked Mar 25, 2014 by balaji.thirumalai

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S1: No heat engine has efficiency of 100% \[\] S2: Complete conversion of heat in to work is not possible.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The Ellingham diagram are constructed for the formation of oxides of elements and they can predict.

asked Mar 20, 2014 by meena.p

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Which metal involves in leaching

asked Mar 13, 2014 by meena.p

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Which is not a macromolecule?

asked Mar 12, 2014 by thanvigandhi_1

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Which of the following is the correct order of increasing the bond length?

asked Mar 7, 2014 by sreemathi.v

1 answer

S1: Radio waves can be polarized. \[\] S2: Sound waves in air are longitudinal in nature.

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 to

asked Feb 26, 2014 by meena.p

1 answer

In the below sequence of reaction X and Y are respectively

asked Feb 25, 2014 by sreemathi.v

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Which of the following statements about Raoult's Law is/are correct?

asked Feb 14, 2014 by sreemathi.v

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Find solution : $(x-2y+1) dy -(3x-6y+2)dx=0$

asked Feb 7, 2014 by meena.p

1 answer

The equation $\large\frac{x^2}{5-a}+\frac{y^2}{4-a}$$=1$ represent ellipse if value of 'a' belongs to what value?

asked Feb 7, 2014 by sreemathi.v

1 answer

For a perfect correlation between the variables $x$ and $y$ the line of regression is $ ax+by+c=0$ where $a,b,c > 0$ then $ r$ is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

Zener diode :

asked Jan 31, 2014 by meena.p

1 answer

Slaked lime is obtained when water is added to

asked Jan 29, 2014 by sreemathi.v

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$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$.The $y$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$x(CH_2O)\rightarrow CO_2+y$.The $y$ can be used as fuel

asked Jan 22, 2014 by sreemathi.v

1 answer

The sum of $n$ terms of an arithmetic progression is $\;n\;(2n-1)$. What is the $m^{th}$ term of the series?

asked Jan 18, 2014 by yamini.v

1 answer

Calculate the energy emitted when electrons of 1.0g atom of hydrogen under go transition giving the spectral lines of lowest energy in the visible region of its atomic spectra.$R_H=1.1\times 10^7m^{-1},c=3\times 10^8msec^{-1}$ and $h=6.62\times 10^{-34}Jsec$

asked Jan 15, 2014 by sreemathi.v

2 answers

The locus of a point $(x,y,z)$ for which $z=k$ is a ?

asked Jan 11, 2014 by rvidyagovindarajan_1

1 answer

If $f(9)=9,f'(9)=4$ then $\lim\limits_{x\to 9}\large\frac{\sqrt{f(x)}-3}{\sqrt x-3}$ is

asked Dec 30, 2013 by sreemathi.v

1 answer

Integrate : $\int \large\frac {e^{2x}+e^{-2x}}{e^{2x}-e^{-2x}}$$dx$

asked Dec 19, 2013 by meena.p

1 answer

The glands present between the 5th and 6th abdominal segment of Cockroach :

asked Dec 11, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are unit vectors that are inclined at angle $2\theta$ where $0\leq \theta \leq \pi$ and $|\overrightarrow a-\overrightarrow b| < 1$ then $ \theta$ lies in the interval....

asked Dec 8, 2013 by rvidyagovindarajan_1

1 answer

Tripedal walking is exhibited by

asked Dec 5, 2013 by thanvigandhi_1

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In the ground state an element has 13 electrons in M shell.The element is

asked Nov 29, 2013 by sreemathi.v

1 answer

A solution has $pH$ = 5 is to be diluted 100 times then it will become

asked Nov 27, 2013 by mosymeow_1

1 answer

A metazoan adult whose body is covered by Cilia is :

asked Nov 27, 2013 by thanvigandhi_1

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A mass M is suspended from a light spring. An additional mass m is added, displaces the spring further by a distnce 'x'. Now the combined mass will oscillate with a period :

asked Nov 16, 2013 by thanvigandhi_1

1 answer

If $\tan^{-1}\large\frac{1}{a-1}$$=\tan^{-1}x+\tan^{-1}(x+1)=\tan^{-1}3x$ is

asked Nov 15, 2013 by sreemathi.v

1 answer

A ball is dropped into a well. The water level in the well is at a depth 'h' below the top. If the speed of sound is V, then after what time the splash of sound is heard?

asked Nov 1, 2013 by thanvigandhi_1

2 answers

Calculate the number of atoms of oxygen present in 88g $CO_2$.What would be the weight of CO having the same no of oxygen atoms ?

asked Oct 30, 2013 by sreemathi.v

1 answer

A circular disc rotates freely about a vertical axis through its centre with angular velocity $ \omega_1$ . A ring having the same mass and radius as the disc is placed on the disc and the system now rotates with an angular velocity $ \omega_2$ about the same vertical axis. Then $ \omega_2 / \omega_1$ is

asked Oct 19, 2013 by thanvigandhi_1

1 answer

A particle is execting simple harmonic motion with an amplitude A and time period T. The displacement of the particles after 2T period from its initial position is

asked Oct 18, 2013 by meena.p

1 answer

A clock pendulum made of invar has a period of $0.5$ sec at$20^{\circ}$. If the clock is used in a climate where the temperature averages to $30^{\circ}C,$ how much time does the clock lose in each oscillation? (for invar, $\alpha=9 \times 10^{-7}/^{\circ}C,g= constant )$

asked Oct 11, 2013 by meena.p

1 answer

A person reaches a point directly opposite on the other bank of a river. The velocity of the water in the river is 4 $ms^{-1}$ and the velocity of the person in still water is 5 $ms^{-1}$. If the width of the river is 84.6 m , time taken to cross the river in seconds is

asked Oct 9, 2013 by thanvigandhi_1

1 answer

The displacements of two particles of same mass executing $SHM$ are represented by the equations $x_1=4 \sin \bigg[10t+\large\frac{\pi}{6}\bigg]$ and $x_2=5 \; \cos(\omega t)$. The value of $\omega$ for which the energy of both the particles remain same is :

asked Sep 30, 2013 by meena.p

1 answer

A uniform chain of length $L$ is lying on the horizontal table . If the coefficient of friction between the chain and the table top is $\mu'$ , what is the maximum length of the chain that can hang over the edge of the table without disturbing the rest of the chain on the table?

asked Sep 24, 2013 by meena.p

2 answers

Two particles A and B of masses 'm' and '2m' are suspended from two mass less springs of force constants $K_1$ and $K_2$. During their oscillation, if their maximum velocities are equal, then ratio of amplitudes of A and B is

asked Sep 17, 2013 by meena.p

1 answer

A planet is moving in an elliptical path around the sun of shown speed of planet in position P and Q are $v_1$ and $v_2$ respectively with $SP= r_1\;and SQ=r_2$ then $v_1/v_2$ is equal to

asked Aug 29, 2013 by meena.p

1 answer

A particle is projected vertically upward with a speed of $16 m/s$, after some time, when it again passes through point of projection, its speed is found to be $8 m/s$. It is known that the work done by air resistance is same during upward and downward motion, Then the maximum height attained by the body is ? $(g=10 m/s^2)$

asked Aug 8, 2013 by meena.p

1 answer

Three forces acting on a body as shown. To have resultant force only along y-direction, the magnitude of the minimum additional force needed is

asked Jul 15, 2013 by meena.p

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