Recent questions tagged class12

Three NAND gates are connected as shown in circuit. The logic operation corresponds to

asked Jan 30, 2014 by meena.p

1 answer

In acidic medium one mole of $MnO_4^-$ accepts how many moles of electrons in a redox process ?

asked Jan 30, 2014 by sreemathi.v

1 answer

Metallic sphere of radius R is charged to potential V . The charge q is proportional to

asked Jan 30, 2014 by yamini.v

1 answer

The property exhibited by only transitional elements

asked Jan 30, 2014 by sreemathi.v

1 answer

Distribution of charges is shown in figure . The flux of electric field due to these charges through the surface is

asked Jan 30, 2014 by yamini.v

1 answer

In first transition series, the melting point of Mn is low because

asked Jan 30, 2014 by sreemathi.v

1 answer

Given the following VI-Characteristic curve of a pn-junction diode, identify what is (A) and (B)?

asked Jan 30, 2014 by meena.p

1 answer

If $A= \; \begin{bmatrix} 1& 0 &0 \\ 2 & 3 & 4\\ 0&1 & 2 \end{bmatrix}$, then the value of $A.(Adj\:A)$ is?

asked Jan 30, 2014 by rvidyagovindarajan_1

1 answer

Vanadium (III) oxide is a strong

asked Jan 30, 2014 by sreemathi.v

1 answer

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r . Find the coulomb force $\;\overrightarrow{F}\;$ between the two

asked Jan 30, 2014 by yamini.v

1 answer

In which of the following will the ionic radii of chromium be the smallest

asked Jan 30, 2014 by sreemathi.v

1 answer

The figure shows two capacitors of capacitance c and charged to same potential c connected in two circuits . What will be the charge on the capacitor after a time $t= cr$ from the start

asked Jan 30, 2014 by meena.p

1 answer

The transitional metal which form green compound in +3 oxidation state and yellow orange compound in +6 oxidation state is

asked Jan 30, 2014 by sreemathi.v

1 answer

If $A=\begin{bmatrix}2 & 3\\5 & -2\end{bmatrix}$ then express $A^{-1}$ in terms of $A$

asked Jan 30, 2014 by rvidyagovindarajan_1

1 answer

Least reactive metal is

asked Jan 30, 2014 by sreemathi.v

1 answer

A $\;Q \;\mu C\;$ is placed at the centre of a cube. The flux coming from any surface will be

asked Jan 30, 2014 by yamini.v

1 answer

Which is most reactive metal

asked Jan 30, 2014 by sreemathi.v

1 answer

The output of the circuit across resistor R is

asked Jan 30, 2014 by meena.p

1 answer

Stainless steel does not rust because

asked Jan 30, 2014 by sreemathi.v

1 answer

Electric field and potential inside hollow charged conducting sphere are respectively

asked Jan 30, 2014 by yamini.v

1 answer

Lanthanoids are

asked Jan 30, 2014 by sreemathi.v

1 answer

If a charge q is placed at the centre of the line joining two equal charges Q such that the system is in equilibrium then the value of q is

asked Jan 30, 2014 by yamini.v

1 answer

Which statement is true about the transitional elements

asked Jan 30, 2014 by sreemathi.v

1 answer

On moving a charge of 100 coulombs by 10 cm , 5 J of work is done , then the potential difference between the points is

asked Jan 30, 2014 by yamini.v

1 answer

The equivalent weight of potassium permanganate for acid solution is

asked Jan 30, 2014 by sreemathi.v

1 answer

Which of the following is not true for transition metals.

asked Jan 30, 2014 by sreemathi.v

1 answer

The highest oxidation state of will be

asked Jan 30, 2014 by sreemathi.v

1 answer

In a certain region V= $\;Axy+Bx^2+Cy\;$ where A , B , C are constants . Find electric field as a function of $\;(x ,y ,z)\;.$

asked Jan 30, 2014 by yamini.v

1 answer

Which of the following is the weakest reducing agent

asked Jan 30, 2014 by sreemathi.v

1 answer

Which of the following forms interstitial compounds

asked Jan 30, 2014 by sreemathi.v

1 answer

Calculate the magnitude of an electric field which can just balance a deutron of mass $\;3.2\times10^{-27}\;kg$

asked Jan 30, 2014 by yamini.v

1 answer

Transition metals are often paramagnetic owing to

asked Jan 30, 2014 by sreemathi.v

1 answer

Electric potential at a point P , due to a point charge q at A at distance r from P is V . Then if double of this charge is uniformly distributed on a hollow sphere of radius 2r centered at A then potential at P due to sphere is

asked Jan 30, 2014 by yamini.v

1 answer

Variable valency is shown by

asked Jan 30, 2014 by sreemathi.v

1 answer

729 drops of same size are charged to a potential of 1 V each . If they coalesce to form a single drop , its potential would be

asked Jan 30, 2014 by yamini.v

1 answer

Lanthanides and actinides resemble in

asked Jan 30, 2014 by sreemathi.v

2 answers

Which forms coloured salts.

asked Jan 30, 2014 by sreemathi.v

1 answer

The electric field in a region of space is $\;\overrightarrow{E}=5 \hat{i} +3 \hat {j}\;.$ The flux of $\;\overrightarrow{E}\;$ due to this field through an area $\;1 m^2\;$ lying in x - z plane is

asked Jan 30, 2014 by yamini.v

1 answer

Which occurs in nature in free state

asked Jan 30, 2014 by sreemathi.v

1 answer

Which of the following statement is not correct.

asked Jan 30, 2014 by sreemathi.v

1 answer

Three identical charges $\;(q)\;$ are placed at corners of an equilateral triangle of side l . Find the work require to double the dimensions of traingle

asked Jan 30, 2014 by yamini.v

1 answer

Which one of the following is reduced by hydrogen peroxide in acid medium

asked Jan 30, 2014 by sreemathi.v

1 answer

Which one of the following is highest melting halide.

asked Jan 30, 2014 by sreemathi.v

1 answer

Five point charges $\;(q\;each)\;$ are placed at five vertices of a regular hexagon of side 2a . What is the magnitude of net electric field at the centre of hexagon .

asked Jan 30, 2014 by yamini.v

1 answer

The atomic numbers of the f-block elements are:

asked Jan 30, 2014 by sreemathi.v

1 answer

The circuit given below represents

asked Jan 30, 2014 by meena.p

1 answer

Match the following:

asked Jan 30, 2014 by sreemathi.v

1 answer

Charges 2 q and q are placed at $\;(a , 0)\;and\;(-a , 0)\;.$ The points where electric field is zero will lie in

asked Jan 30, 2014 by yamini.v

1 answer

Consider the following statement, which of the following choices is correct?

asked Jan 30, 2014 by sreemathi.v

1 answer

Match the following catalysts to the transition metal used.

asked Jan 30, 2014 by sreemathi.v

1 answer

Ask Questions, Get Answers