Recent questions tagged class12

In the circuit shown below two inputs A and B and output C is given. The circuit represents

asked Jan 30, 2014 by meena.p

1 answer

A proton is released from rest , 10 cm from a charged sheet carrying charge density of $\;-2.21\times10^{-9}\;c/m^2\;.$ It will strike the sheet after time $\;(approximately)$

asked Jan 30, 2014 by yamini.v

1 answer

For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which odes not solidify before glass. The metal used can be?

asked Jan 30, 2014 by sreemathi.v

1 answer

The standard reduction potentials (E$^{\circ}$ ) of the lanthanides for M$^{+3}$ (aq) + 3e$^{-} \overset{\Delta} \rightarrow$ M (s) all fall between –2.52 V (La) and –2.25 V (Lu). This helps explain which of the following properties of Lanthanides?

asked Jan 30, 2014 by sreemathi.v

1 answer

Formation of interstitial compounds makes the transition metal more:

asked Jan 30, 2014 by sreemathi.v

1 answer

Two point charges $\;q_{1}=3\times10^{-6}\;C\;$ and $\;q_{2}=5\times10^{-6}\;C\;$ are located at $\;(3 , 5 ,1)\;$ and $\;(1 , 3 , 2)\;m$ . Find the force on $\;q_{1}\;$ due to $\;q_{2}\;.$

asked Jan 30, 2014 by yamini.v

1 answer

Match the following, where EAN stands for Effective Atomic Number, the number of electrons on the central metal ion, including ligands in the bonding:

asked Jan 30, 2014 by sreemathi.v

1 answer

Which of the following statements about magnetic properties is/are incorrect?

asked Jan 30, 2014 by sreemathi.v

1 answer

Suppose you roll 5 dice and sum up the highest 3 numbers. What is the probability that the sum is 18?

asked Jan 30, 2014 by balaji

1 answer

If a transition-metal compound absorbs violet radiation of the visible region, its colour would be?

asked Jan 30, 2014 by sreemathi.v

1 answer

Suppose that 5% of men and 0.25% of women have grey hair. A grey haired person is selected at random. What is the probability of this person being male? Assume that there are equal number of males and females.

asked Jan 30, 2014 by balaji

1 answer

What is the spin only magnetic moment value in Bohr magneton unit for $K_2Co(SCN)_4$?

asked Jan 30, 2014 by sreemathi.v

1 answer

Find the force on points of a triangle

asked Jan 30, 2014 by yamini.v

1 answer

What is the spin only magnetic moment value in (Bohr Magneton units) of Cr(CO)$_6$?

asked Jan 30, 2014 by sreemathi.v

1 answer

Which of the following ions is expected to be colourless - $Ti^{4+}, Cu^{2+}, V^{3+}$ and $Fe^{2+}$?

asked Jan 30, 2014 by sreemathi.v

1 answer

What is the angle between following planes $2x-3y+4z=1$ and $-x+y=4$?

asked Jan 30, 2014 by balaji

1 answer

Consider the situation of figure the work done in moving to particles from P to A is $\;W_{A}\;is\;W_{B}\;$ and $\;P\;to\;C\;W_{C}\;$ Find the correct relation .

asked Jan 30, 2014 by yamini.v

1 answer

The Atomic numbers of Mn, Fe and Co are 25, 26 and 27 respectively. The order of Magnetic moments among the following is

asked Jan 30, 2014 by sreemathi.v

1 answer

The radius of (Atomic number of La = 57) is 1.06 A. Which one of the following given values will be closest to the radius of Lu$^{3+}$? Note: Atomic radius of Lu = 71.

asked Jan 30, 2014 by sreemathi.v

1 answer

What is the area of the parallelogram having diagonals $ 3\bar{i}+\bar{j}-2\bar{k}\;and\;\bar{i}-3\bar{j}+4\bar{k}$?

asked Jan 30, 2014 by balaji

1 answer

The electronic configuration of chromium in its ground state is

asked Jan 30, 2014 by sreemathi.v

1 answer

Math the following Groups with respect to its electron configuration:

asked Jan 30, 2014 by sreemathi.v

1 answer

The Output Y of the figure is :

asked Jan 30, 2014 by meena.p

1 answer

The figure represents

asked Jan 30, 2014 by meena.p

1 answer

The Boolean equation for the circuit is

asked Jan 30, 2014 by meena.p

1 answer

If $e^{x+y}=xy,$ what is $\large\frac{dy}{dx}$?

asked Jan 29, 2014 by balaji

1 answer

Given $A=\begin{bmatrix} 3 & -3 & 4 \\2 & -3 & 4 \\0 & -1 & 1 \end{bmatrix}$ How can we express $A^{-1}$ in terms of A?

asked Jan 29, 2014 by balaji

1 answer

Let $(f:R \to R)$ be defined as $(f(x)=2x+3.)$Find the function $(g(x):R \to R)$ such that $(g\;o\;f = f\;o\;g = I_R.)$

asked Jan 29, 2014 by balaji

1 answer

A ring of radius R is having charges $\; q \;and \; 3 q\;$ distributed on its two half parts . The electric potential at a point on the axis $\;\sqrt{3}\;R\;$ from its centre is

asked Jan 29, 2014 by yamini.v

1 answer

A proton , a deutron and alpha particle are accelerated through potentials of $\;V , 2V ,4V\;$respectively . Their velocity will bear a ratio .

asked Jan 29, 2014 by yamini.v

1 answer