Recent questions tagged class12

Highest oxidation state exhibited by a 3d-metal is

asked Jan 29, 2014 by sreemathi.v

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Find the direction of electric field at point P for the charge distribution as shown in figure

asked Jan 29, 2014 by yamini.v

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If a body is charged by rubbing it , its weight

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What is the oxidation state of Fe in FeCl$_3$?

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Which of the following salts are colourless?

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The electronic configuration of divalent cation of Eu is

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Which of the following is a lanthanide element?

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The most common oxidation states of Gold are:

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Which of the following is a lanthanide?

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The 2 most common oxidation states shown by cerium are

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The electronic configuration of gadolinium is

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A point charge q=12.5 $\mu $C is placed at origin . Find the electric field vector at the point $\;(4 , 3)$ .

asked Jan 29, 2014 by yamini.v

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Which of the following transition metal ions are colourless?

asked Jan 29, 2014 by sreemathi.v

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The color of a transition metal complex results from which of the following reasons?

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The oxidation state of Ni in $Ni(CO)_4$ is

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Three point charges of each of charge q are placed on three vertices of a square of side "l" meter . Find the magnitude of electric field at the centre of the square .

asked Jan 29, 2014 by yamini.v

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Which of the following statements regarding transition elements is/are incorrect?

asked Jan 29, 2014 by sreemathi.v

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Magnese exhibits oxidation states

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Identify the correct statement about the charges $\;q_{1} \;and\; q_{2}$

asked Jan 29, 2014 by yamini.v

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How many 'd' electrons are present in $Cr^{+2}$ ion?

asked Jan 29, 2014 by sreemathi.v

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At what separation should two equal charges 1.0 C be placed so that the force between then equals the weight of a 25 kg person ?

asked Jan 29, 2014 by yamini.v

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The changed name of kurchatovium

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The formula for calculating the Highest Oxidation State for a Transition metal can be given as follows: Number of Unpaired d-electrons + Two s-orbital electrons. This is true for all the transition metals except two. Which of the following two?

asked Jan 29, 2014 by sreemathi.v

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Units of electric flux are

asked Jan 29, 2014 by yamini.v

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The catalyst used in manufacture of $HNO_3$ is

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The following figure has two NOT gates and a NOR. What does it represent?

asked Jan 29, 2014 by meena.p

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Liquid element(metal) among d-block is

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When the separation between two charges is increased the electric potential energy of the charges

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Which of the gate is represented by

asked Jan 29, 2014 by meena.p

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What is the total charge on 75.0 kg of electrons ?

asked Jan 29, 2014 by yamini.v

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How many NAND gates are used to form an AND gate

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How many electrons must be removed from a piece of metal to give it a positive charge of $\;1\times10^{-7} \;C\;?$

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Truth table given below represents

asked Jan 28, 2014 by meena.p

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The following logic symbol represents

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For a given transistor, the value of the forward transfer ratio $\beta =50$. Calculatethe ratio of change in collector current to the change in emitter current.

asked Jan 28, 2014 by meena.p

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WHich of the following best describes the output of a full wave rectifier:

asked Jan 28, 2014 by meena.p

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The emitter current in a transistor is $ 1mA$ If $\alpha =0.95$ value of base current is :

asked Jan 28, 2014 by meena.p

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The transconductance of a transistor used as an amplifier in common emitter mode is $0.1 \;mho.$ When a signal of 10 mv is added to base emitter voltage change in collector current is

asked Jan 28, 2014 by meena.p

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Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.

asked Jan 28, 2014 by meena.p

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In a p-n function diode a input signal is applied as shown. The output across $R_L$ is

asked Jan 28, 2014 by meena.p

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In a transistor the level of doping for the three region is different . In the order of decreasing doping level,

asked Jan 28, 2014 by meena.p

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Under the conditions when no bias is applied across a p-n junction

asked Jan 28, 2014 by meena.p

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If $A=\begin{bmatrix}2 & sec^{-1}x\\-1 & cosec^{-1} x \end{bmatrix}$ is a singular matrix then find the value of $x$

asked Jan 28, 2014 by rvidyagovindarajan_1

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Which of the following is used to produce ratio waves of constant amplitude

asked Jan 28, 2014 by meena.p

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When p end of P-n junction is connected to positive terminal of the battery and N end to negative terminal , the p-n junction behaves like

asked Jan 28, 2014 by meena.p

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Which of the following statement is incorrect ?

asked Jan 28, 2014 by meena.p

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For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of

asked Jan 28, 2014 by meena.p

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The valancy of impurity atom added to silicon to make it P type is

asked Jan 28, 2014 by meena.p

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The forbidden gap in energy bands in silicon is order of

asked Jan 28, 2014 by meena.p

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If $3\tan^{-1}x+4\cot^{-1}x=2\pi$ then $ x$ =?

asked Jan 28, 2014 by rvidyagovindarajan_1

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