Recent questions tagged eamcet

The total number of $ \sigma\: and \: \pi$ bonds in pyrophosphoric acid are respectively :

asked Nov 9, 2013 by thanvigandhi_1

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Which one of the following is a correct set?

asked Nov 9, 2013 by thanvigandhi_1

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Which one of the following statement is not correct?

asked Nov 9, 2013 by thanvigandhi_1

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In which of the following reactions hydrogen is not liberated?

asked Nov 9, 2013 by thanvigandhi_1

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Which property among the following is same for both hydrogen and deuterium molecules?

asked Nov 9, 2013 by thanvigandhi_1

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Which one of the following gives a straight line for Freundlich adsorption isotherm?

asked Nov 9, 2013 by thanvigandhi_1

1 answer

What is the entropy change in $ J.K^{-1}$ during the melting of 27.3 grams of ice at $ 0^{\circ}C$ ? (Latent heat of fusion of ice = 330 $ j.g^{-1}$)

asked Nov 9, 2013 by thanvigandhi_1

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The pH of 0.05 M acetic acid is $ ( K_a = 2 \times 10^{-5} )$

asked Nov 9, 2013 by thanvigandhi_1

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If the equilibrium constant for the reaction $ 2AB \rightleftharpoons A_2+B_2 \: is \: 49$, what is the equilibrium constant for $ AB \rightleftharpoons \large\frac{1}{2}\: A_2 + \large\frac{1}{2}B_2$?

asked Nov 9, 2013 by thanvigandhi_1

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The vapour pressure of water at $23^{\circ}$ is $19.8\;mm. 0.1$ mole of glucose is dissolved in $178.2\;g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

asked Nov 8, 2013 by meena.p

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A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4 . The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?

asked Nov 8, 2013 by meena.p

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In the reaction

asked Nov 8, 2013 by meena.p

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x grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of x (in grams)?

asked Nov 8, 2013 by meena.p

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Which of the following is correct ?

asked Nov 8, 2013 by meena.p

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'Natalite' is used as:

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is a linear molecule ?

asked Nov 8, 2013 by meena.p

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Identify the correct order in which the covalent radius of the following elements increases:

asked Nov 8, 2013 by meena.p

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3-hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y and Z?

asked Nov 8, 2013 by meena.p

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The half-lives of two radioactive nuclides A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated?

asked Nov 8, 2013 by meena.p

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An electron is moving in Bohr's fourth orbit. It's de-Broglie wave length is $\lambda$. What is the circumference of the fourth orbit ?

asked Nov 8, 2013 by meena.p

2 answers

Which of the following , compounds is the reactant in Rosenmund's reduction?

asked Nov 8, 2013 by meena.p

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The atomic numbers of elements X,Y and Z are 19,21 and 25 respectively. The number of electrons present in the M shell of these elements follow the order:

asked Nov 8, 2013 by meena.p

1 answer

In which of the following reactions the product is an ether ?

asked Nov 8, 2013 by meena.p

1 answer

Which of the following is an example for heterogeneous catalysis reaction?

asked Nov 8, 2013 by meena.p

1 answer

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

asked Nov 8, 2013 by meena.p

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Identify A and B in the following reactions:

asked Nov 8, 2013 by meena.p

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Sodium is heated in air at $300 ^{\circ}C$ to form x.x absorbs $CO_2$ and forms $Na_2CO_3$ and Y. Which of the following is Y?

asked Nov 8, 2013 by meena.p

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Observe the following statements regarding purification of bauxite:

asked Nov 8, 2013 by meena.p

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The chemicals and the reaction conditions required for the preparation of ethane are :

asked Nov 8, 2013 by meena.p

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A complex compound of $Co^{3+}$ with molecular formula $CoCl_x.yNH_3$ gives a total of 3 ions when dissolved in water. How many $Cl^{-}$ ions satisfy both primary and secondary valencies in this complex ?

asked Nov 8, 2013 by meena.p

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In Fischer-Ringe 's method of separation of nobles gas mixture from air, ................... is used:

asked Nov 8, 2013 by meena.p

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An n-p-n transistor power amplifier in C-E configuration gives :

asked Nov 8, 2013 by meena.p

1 answer

Particles and their anti- particles have:

asked Nov 8, 2013 by meena.p

1 answer

A particle of mass $1 \times 10^{-26}\;kg$ and charge $1.6 \times 10^{-19} C$ travelling with a velocity $1.28 \times 10^{6} ms^{-1}$ along the positive X-axis enters a region in which a uniform electric field $\overrightarrow {E} $ and a uniform magnetic field of induction $\overrightarrow {B}$ are present. If $\overrightarrow {E} =-102.4 \times 10^3 \hat k NC^{-1}$ and $B= 8 \times 10^{-2}\; \hat j Wbm^{-2}$, the direction of motion of the particles is :

asked Nov 8, 2013 by meena.p

1 answer

According to Moseley's law, the frequency (v) of the $K_{\alpha}$ line and the atomic number Z of the element have the relation (A and B are constants);

asked Nov 8, 2013 by meena.p

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Magnetic field induction at the center of a circular coil of radius 5 cm and carrying a current 0.9 A is (in SI units) ($\in _0$= absolute permittivity of air in SI units, velocity of light $= 3 \times 10^8 ms^{-1})$

asked Nov 8, 2013 by meena.p

1 answer

Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is one meter. A train is travelling with a velocity of 72 km/h along the track. The reading of the millivoltmeter (in mV) is : (Vertical component of the earth's magnetic induction is $2 \times 10^{-5} T)$

asked Nov 8, 2013 by meena.p

1 answer

An inductance 1 H is connected in series with an AC source of 220 V and 50Hz. The inductive reactance (in ohms) is :

asked Nov 8, 2013 by meena.p

1 answer

Consider the following statements A and B and identify the correct answers given below: A: Peltier coefficient is numerically equal to the potential difference across the junctions of the thermonuclear through which current is flowing. B:According to Thomson, energy is neither absorbed nor evelved at the junction of a thermocouple but is observed or evolved only along the lengths of both the conductors.

asked Nov 8, 2013 by meena.p

1 answer

In a meter bridge a $30\;\Omega$ resistance is connected in the left gap and a pair of resistances P and Q in the right gap. Measured from the left, the balance point is 37.5 cm , when P and Q are in series and $71.4\;cm$ when they the parallel. The values of P and Q (in $\Omega$) are :

asked Nov 8, 2013 by meena.p

1 answer

A 6 V cell with $0.5 \Omega$ internal resistance, a 10 V cell with $1 \Omega$ internal resistance and a $12 \Omega$ external resistance are connected in parallel. The current (in ampere) through the 10 V cell is :

asked Nov 8, 2013 by meena.p

1 answer

Two charges 2 C and 6C are separated by a finite distance. If a charge of $-4C$ is added to each of them, the initial force of $12 \times 10^3\;N$ will change to :

asked Nov 7, 2013 by meena.p

1 answer

A 4 $\mu F$ capacitor is charged by a 200 V battery. It is then disconnected from the supply and is connected to another uncharged $2\; \mu F$ capacitor. During the process, loss of energy (in J) is :

asked Nov 7, 2013 by meena.p

1 answer

If two identical bar magnets, each of length l, pole strength m, and magnetic moment M are placed perpendicular to each other with their unlike poles in contact, the magnetic moment of the combination is :

asked Nov 7, 2013 by meena.p

1 answer

With a standard rectangular bar magnet of length (l), breath (b ; b < < l) and magnetic moment M, the time period of the magnet in a vibration magnetometer is 4 s. If the magnet is cut normal to its length into four equal pieces, the time period (in seconds) with one of the pieces is :

asked Nov 7, 2013 by meena.p

1 answer

A light ray of wavelength $ \lambda$ is passing through a pin hole of diameter D and the effect is observed on a screen placed at a distance L from the pin hole. The approximations of geometrical optics are applicable if :

asked Nov 7, 2013 by meena.p

1 answer

Fraunhofer lines are produced by the absorption of light in :

asked Nov 7, 2013 by meena.p

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The focal length of an equi-convex lens is greater than the radius of curvature of any of the surfaces. Then the refractive index of the material of the lens is :

asked Nov 7, 2013 by meena.p

1 answer

Assertion (A) :Propagation of light through an option fibre is due to total internal reflection taking place place at the core-clad interface. Reason (R): Refractive index of the material of the core of the optical fibre is greater than that of air .

asked Nov 7, 2013 by meena.p

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A transverse wave propagating on a stretched string of linear density $3 \times 10^{-4}\;kg-m^{-1}$ is represented by the equation $y=0.2 \sin (15 x +60 l)$ where x is in meters and l is in seconds . The tension in the string (in newton) is :

asked Nov 7, 2013 by meena.p

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