Recent questions tagged q46

The correlation coefficient between $x$ and $y$ is from the following data is \[\] $ \Sigma x = 40\: \: \Sigma y=50\: \: \Sigma xy = 220\: \: \Sigma x^2=200\: \: \Sigma y^2 = 262\: \: n=10$

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The forbidden gap in energy bands in silicon is order of

asked Jan 28, 2014 by meena.p

1 answer

$Na$ and $Li$ are burnt in dry air we get

asked Jan 28, 2014 by sreemathi.v

1 answer

The volume strength of $3N-H_2O_2$ solution is

asked Jan 23, 2014 by sreemathi.v

1 answer

Which of the following is not the effect of acid rain

asked Jan 21, 2014 by sreemathi.v

1 answer

The probability that the same number appear on throwing three dice simultaneously is

asked Jan 15, 2014 by thanvigandhi_1

1 answer

Among the following series of transition metals ions,the one where all metal ions have $3d^2$ electronic configuration is

asked Jan 13, 2014 by sreemathi.v

1 answer

Which does not change on dilution?

asked Jan 9, 2014 by sreemathi.v

1 answer

Let $A$ and $B$ be two events, such that: $ P(\overline{A \cup B} ) $$= \large\frac{1}{6}\:$,$\;\; P( A \cap B ) $$= \large\frac{1}{4} $,$\;$and $\;\;P(\overline A)$$=\large\frac{1}{4}$ where $\overline A$ stands for complement of event $A$. Then events $A$ and $B$ are

asked Jan 3, 2014 by thanvigandhi_1

1 answer

Find the sum of n terms of the series 2.4+5.7+8.10+------------

asked Jan 3, 2014 by yamini.v

1 answer

If $L\rightarrow\:\:\large\frac{x-1}{3}=\frac{y+1}{2}=\frac{z-3}{-1}$ and the plane $P\rightarrow\:\:x-2y-z=0$, then which of the following is true?

asked Jan 2, 2014 by rvidyagovindarajan_1

1 answer

Value of $\lim_{x\to 2^-}\{x+(x-[x]^2)\}$ is

asked Dec 24, 2013 by sreemathi.v

1 answer

If M ( A;Z), $M_p\: and \: M_n$ denote the masses of the nucleus $ ^A_ZX,$ proton and neutron respectively in units of $u\: (1u=931.5Mev/C^2)$ and BE represents its bonding energy in MeV, then :

asked Dec 16, 2013 by thanvigandhi_1

0 answers

$\int \limits_0^1 |\sin 2zx| dx$

asked Dec 16, 2013 by meena.p

1 answer

Which of following is correct statement?

asked Dec 12, 2013 by sreemathi.v

1 answer

Night queen and day king belong to one of the following genera :

asked Dec 9, 2013 by thanvigandhi_1

0 answers

An alkaloid called cap sine is obtained from this plant

asked Dec 2, 2013 by thanvigandhi_1

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$Be^{2+}$ is isoelectronic with :

asked Nov 27, 2013 by sreemathi.v

1 answer

The extension of pith between the vascular bundles, as seen in the transerse section of a young dicot stem is called :

asked Nov 26, 2013 by thanvigandhi_1

1 answer

Degree of dissociation of an acid HCl is 95%. 0.192 g of the acid is present in 0.5 L of solution. The pH of the solution is

asked Nov 23, 2013 by mosymeow_1

1 answer

Which of the following statements is NOT considered as a criterion for the essentiality of elements ?

asked Nov 23, 2013 by thanvigandhi_1

0 answers

Let $A=\begin{vmatrix}5 &5\alpha&\alpha\\0&\alpha&5\alpha\\0&0&5\end{vmatrix}$ if $\mid A^2\mid=25$ then $\alpha$ equals

asked Nov 21, 2013 by sreemathi.v

1 answer

The value of $[\overrightarrow a-\overrightarrow b\:\:\overrightarrow b-\overrightarrow c\:\:\overrightarrow c-\overrightarrow a]$ where $|\overrightarrow a|=1,\:\:|\overrightarrow b|=5\:\:|\overrightarrow c|=3$ is ?

asked Nov 18, 2013 by rvidyagovindarajan_1

1 answer

The plane that divides the body into right and left halves :

asked Nov 12, 2013 by thanvigandhi_1

0 answers

The area (in square units) of the triangle formed by the lines $x=0,y=0$ and $3x+4y=12,$ is :

asked Nov 12, 2013 by meena.p

1 answer

The equation of the line passing through the point of intersection of the lines $x-3y+2=0$ and $2x+5y-7=0$ and perpendicular to the line $3x+2y+5=0$ is :

asked Nov 6, 2013 by meena.p

1 answer

Flightless bird with preen gland is

asked Oct 27, 2013 by thanvigandhi_1

1 answer

The angle between the line joining the points $(1,-2),(3,2)$ and the line $x+2y-7=0$ is

asked Oct 25, 2013 by meena.p

1 answer

A partially dried clay mineral contains 8% water.The original sample contained 12% water and 45% silica.The % of silica in the partially dried sample in nearly :

asked Oct 25, 2013 by sreemathi.v

1 answer

The transformed equation of $3x^2+3y^2,2xy=2$ when the coordinate axes are rotated through an angle of $45^{\circ}$ is

asked Oct 17, 2013 by meena.p

1 answer

The connective tissue that helps in the maintenance of body temperature in New Born is

asked Oct 17, 2013 by thanvigandhi_1

1 answer

If $p=\cos 55^{\large\circ},q=\cos 65^{\large\circ}$ and $r=\cos 175^{\large\circ}$ then the value of $\large\frac{1}{p}+\frac{1}{q}+\frac{r}{pq}$ is

asked Oct 17, 2013 by sreemathi.v

1 answer

The value of $\lambda$ with $|\lambda| < 16$ such that $2x^2-10xy+12y^2+5x+\lambda y -3=0$ represents a pair of straight lines, is :

asked Oct 10, 2013 by meena.p

1 answer

The value of $\tan 81^{\large \circ}-\tan 63^{\large\circ}-\tan 27^{\large\circ}+\tan 9^{\large \circ}$ is

asked Oct 9, 2013 by sreemathi.v

1 answer

A tank of diameter $0.6 \;m$ and height $1\;m$ has a hole at of diameter $10\;mm$ at a depth of $0.6\;m$ from the free surface. What is the thrust force due to the water issuing from the hole. $(g=10m/s^2)$

asked Oct 8, 2013 by meena.p

1 answer

What is the resting membrane potential of nerve fibre?

asked Oct 5, 2013 by thanvigandhi_1

1 answer

The distance between the two lines represents by $8x^2-24 xy +18 y^2-6x+9y-5=0$

asked Sep 27, 2013 by meena.p

1 answer

In triangle ABC if $a \cos ^2 \large\frac{C}{2}$$+c \cos ^2 \large\frac{A}{2}=\frac{3b}{2}$, then the sides of the triangle are in

asked Sep 20, 2013 by meena.p

1 answer

The equation of the pair of lines passing through the origin whose sum and product of slopes are respectively the arithmetic mean geometric mean of 4 and 9 is

asked Sep 16, 2013 by meena.p

2 answers

The kinetic energy of 8g of $H_2$ at $27^{\circ}C$ is ................. times more than the kinetic energy of $8g$ of $O_2$ at the same temperature.

asked Sep 12, 2013 by meena.p

0 answers

The height to which the acceleration due to gravity becomes $\large\frac{g}{9}$ (where g= acceleration due to gravity at surface of earth ) in terms of $R$, is

asked Aug 21, 2013 by meena.p

1 answer

The interval on which the function $f(x)=2x^3+9x^2+12x-1$ is decreasing is :

asked Aug 12, 2013 by sreemathi.v

1 answer

Water is pumped through a hose-pipe at the rate of 75 lit/min in and issue from a nozzle of cross sectional area of 0.00625 sq-m. The force of reaction of nozzle is

asked Jul 22, 2013 by meena.p

1 answer

Two blocks of 100 kg and 50 kg connected by a massless string passing over a frictionless pulley rests on frictionless inclined plates inclined at angles $30^{\circ}$ and $60^{\circ}$ what is the acceleration and which way the system moves? $(g=10 m/s)$

asked Jul 10, 2013 by meena.p

1 answer

To find the value of $g$ using simple pendulum $T=2.00 sec,\;l=50cm.$ was measured. The maximum possible errors in $g$ is (Error in $T$=0.01 sec,$l$=0.1 cm)

asked Jun 19, 2013 by meena.p

1 answer

If $u=\sin^{-1}\begin{pmatrix}\large\frac{x^{4}+y^{4}}{x^{2}+y^{2}}\end{pmatrix}$ and $f=\sin u$ then $f$ is a homogeneous function of degree

asked May 20, 2013 by poojasapani_1

1 answer

The equation of the plane passing through the point $(2 , 1 , -1 )$ and the line of intersection of the planes $\overrightarrow{r}. (\overrightarrow{i}+\overrightarrow{3j}-\overrightarrow{k})=0$ and $\overrightarrow{r}. (\overrightarrow{j}+\overrightarrow{2k})=0$ is

asked May 10, 2013 by poojasapani_1

1 answer

If the second die always shows an odd no. find the conditional probability of getting a sum as 7, if a pair of dice is to be known.

asked Feb 5, 2013 by meena.p

0 answers

Evaluate:\[\int \frac {dx}{a^2 \sin^2 x+b^2\cos^2x}\]

asked Feb 3, 2013 by meena.p

0 answers

A rectangular window is surmounted by an equilateral triangle. Given that the perimeter is 16 cm. Find the width of the window so that the maximum amount of light may enter.

asked Jan 29, 2013 by meena.p

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