Recent questions tagged q3

If $\phi (x) =f(x) g(x),$ where $f'(x) g'(x) =c$ and $ \large\frac {\phi ''}{\phi} =\frac {f''}{f} +\frac{g''}{g}+\frac{Kc}{fg}$ then value of K.

asked Jan 31, 2014 by meena.p

1 answer

The charge on cobalt in $[CO(CN)_6]^{3-}$ is

asked Jan 31, 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

The alkali metal atom that easily form cation is

asked Jan 27, 2014 by sreemathi.v

1 answer

Semi conductors doped with donor atoms have majority carriers as

asked Jan 27, 2014 by meena.p

1 answer

Three different gases, one monoatomic, one diatomic and one triatomic are expanded adiabatically under similar conditions, i.e., their final and initial conditions are the same. The least amount of work is done in the case of which gas?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

The inverse of the converse of a conditional statement is the _______________.

asked Jan 22, 2014 by thanvigandhi_1

1 answer

The name hydrogen was proposed by

asked Jan 22, 2014 by sreemathi.v

1 answer

Which of the following is primary pollutant?

asked Jan 20, 2014 by sreemathi.v

1 answer

Which of the following options indicate the correct contrapositive and converse respectively of the Statement- “Something is cold implies that it has cold temperature.”

asked Jan 18, 2014 by thanvigandhi_1

1 answer

What is the negation of the statement- “Chennai is the capital of Tamil Nadu”.

asked Jan 17, 2014 by thanvigandhi_1

1 answer

Calculate the velocity of electron ejected from platinum surface when radiation of 200nm fall on it. Work function of platinum is 5eV. $(1eV=1.6\times 10^{-19}J$)

asked Jan 9, 2014 by sreemathi.v

1 answer

A and B throw a die. The probability that A's throw is not greater than B's is :

asked Jan 3, 2014 by thanvigandhi_1

1 answer

A family has 4 children. A child is selected at random from the family. Assuming that there are equal number of boys and girls in the family, the probability that the selected child is a girl is

asked Jan 2, 2014 by thanvigandhi_1

1 answer

Given that four positive numbers are in HP, which of the following is true.

asked Dec 30, 2013 by yamini.v

1 answer

A discontinuous function $y=f(x)$ satisfying $x^2+y^2=4$ is given by $f(x)$=_________

asked Dec 20, 2013 by sreemathi.v

1 answer

The line $\overrightarrow r=\hat i+2\hat j-\hat k+\lambda(2\hat i-\hat k)$ is $\perp$ to which axis?

asked Dec 18, 2013 by rvidyagovindarajan_1

1 answer

The distance travelled by a particle starting from rest and moving with an acceleration $ \large\frac{4}{3}\: ms^{-2}$, in the third second is :

asked Dec 14, 2013 by thanvigandhi_1

0 answers

Integrate $\int \limits_0^1 x(1-x)^n dx. n \in N$

asked Dec 12, 2013 by meena.p

1 answer

EMF of the cell $Sn,SnCl_2(0.5M)/AgCl,Ag$ is $0.430V$ at $25^{\large\circ}$C and $0.448$ at $0^{\large\circ}$C. The free energy change$(\Delta G)$, enthalpy change($\Delta H)$ and entropy change $(\Delta S)$ of the cell $rx_n$ at $25^{\large\circ}C$ are

asked Dec 10, 2013 by sreemathi.v

1 answer

Match Column I (Hybrid bond orbitals ) with Column II (species) and select the correct answer.

asked Dec 9, 2013 by sreemathi.v

1 answer

The cells are chlorophyllous, fewer in number, unique in shape and inner walls thick. This description fits into :

asked Dec 6, 2013 by thanvigandhi_1

0 answers

Which of the following compounds does not obey the octet rule?

asked Dec 6, 2013 by sreemathi.v

2 answers

In most stable structure of $ClF_3$ molecule, how many lone pairs are there in equatorial positions

asked Dec 6, 2013 by sreemathi.v

1 answer

Refer to the below equation :

asked Dec 4, 2013 by sreemathi.v

1 answer

Which order are correct regarding the melting point?

asked Dec 2, 2013 by sreemathi.v

1 answer

Malpighian cells are

asked Dec 1, 2013 by thanvigandhi_1

0 answers

$NH_3$ can be prepared by

asked Nov 26, 2013 by sreemathi.v

1 answer

If $E(\theta)=\begin{bmatrix}\cos^2\theta&\cos \theta\sin \theta\\\cos \theta\sin\theta&\sin^2\theta\end{bmatrix}$ and $\theta$ and $\phi$ differ by an odd multiple of $\large\frac{\pi}{2}$ then $E(\theta)E(\phi)$ is a

asked Nov 25, 2013 by sreemathi.v

1 answer

Hardwickia yields

asked Nov 24, 2013 by thanvigandhi_1

0 answers

Root, stem and leaf are all modified in

asked Nov 22, 2013 by thanvigandhi_1

0 answers

For positive numbers $x,y$ and $z$ the numerical value of the determinant $\begin{vmatrix}1 &\log_xy&\log_xz\\\log_yx&1&\log_yz\\\log_zx&\log_zy&1\end{vmatrix}$ is

asked Nov 21, 2013 by sreemathi.v

1 answer

What happens to a solid whose vapour pressure reaches 760 mm Hg at temperatures which are lower than the triple point?

asked Nov 13, 2013 by mosymeow_1

1 answer

The horizontal and vertical displacements x and y of a projectile at a given time t are given by $x=6t$ meter and $y=8 t -5t^2$ metre. The range of the projectile in meter is :

asked Nov 13, 2013 by meena.p

1 answer

If N denotes the set of all positive integers and if $f: N \to N$ is defined by $f(n) =$ the sum of positive divisors of n then, $f(2^k.3),$ where k is a positive integers, is :

asked Nov 11, 2013 by meena.p

1 answer

A teacher was explaining about a plant whose venation pattern is basically similar to Eryngium, fruit is berry and stem shows signs of perennation. He was trying to arrive at one of the following :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

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

asked Nov 8, 2013 by meena.p

0 answers

A body projected vertically upwards crosses a point twice in its journey at a height h just after $t_1$ and $t_2$ seconds. Maximum height reached by the body is :

asked Nov 7, 2013 by meena.p

1 answer

For the reaction ,$N_2O_5(g)\iff 2NO_2(g)+0.5O_2(g)$.Calculate the mole fraction of $N_2O_5(g)$ decomposed at a constant volume and temperature,if the initial pressure at any time is 960mm Hg.Assume ideal gas behaviour.

asked Nov 6, 2013 by sreemathi.v

1 answer

If $f: R \to R$ is defined by $f(x)= \left\{ \begin{array}{1 1} x+4 & \quad for & \quad x < -4 \\ 3x+2 & \quad for & \quad -4 \leq x < 4 \\ x-4 & \quad for & \quad x \geq 4 \end{array}. \right. $ then the correct matching of List I from List II is :

asked Nov 5, 2013 by meena.p

1 answer

A molecule (X) has (i) four sigma bonds formed by the overlap of $sp^2$ and orbitals (ii) one sigma bond formed by $sp^2$ and $sp^2$ orbitals and (iii) one $\pi$ bond formed by $P_x$ and $P_z$ orbitals. Which of the following is X?

asked Oct 29, 2013 by meena.p

1 answer

If $|\overrightarrow a|=2,\:|\overrightarrow b|= 3$ and $\overrightarrow a.\overrightarrow b=4$, then $|\overrightarrow a-\overrightarrow b|$=?

asked Oct 28, 2013 by rvidyagovindarajan_1

1 answer

A body is projected from the earth at angle $30^{\circ}$ with the horizontal with some initial velocity. If its range is 20 m, the maximum height reached by it is : (in meters)

asked Oct 28, 2013 by meena.p

1 answer

Study the following lists with reference to transmission of viral diseases

asked Oct 25, 2013 by thanvigandhi_1

1 answer

If $R \to R$ and $g: R \to R$ are defined by $f(x)=x-[x]$ and $g(x)=[x]$ for $x \in R,$ where $[x]$ is the greatest integer not exceeding x, then for every $x \in R, f(g(x))$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

asked Oct 23, 2013 by meena.p

1 answer

Insulin contains 3.4% sulphur.Then the minimum molecular mass of the insulin is about

asked Oct 22, 2013 by sreemathi.v

2 answers

A block of mass $m=25\;kg$ sliding on a smooth horizontal surface with a velocity $v=3\;ms^{-1}$ meets the spring of spring constant $k=100\;n/m$ fixed at one end as shown in figure. Th maximum compression of the spring and velocity of block as it returns to the original position respectively are

asked Oct 22, 2013 by meena.p

1 answer

$25g$ of $MCl_4$ contains $0.5\;mol$ chlorine then its molecular mass is

asked Oct 22, 2013 by sreemathi.v

1 answer

The number of solutions of the pair of equations $2\sin^2\theta-\cos 2\theta=0,2\cos^2\theta-3\sin\theta=0$ in the interval $[0,2\pi]$ is

asked Oct 17, 2013 by sreemathi.v

1 answer

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