Recent questions tagged q13

In a p-n junction the depletion region is $200 nm$ wide and a electric field of $10^6 vm^{-1}$ exists in it. What is the minimum kinetic energy of conducting electron to diffuse through the barriers.

asked Jan 27, 2014 by meena.p

1 answer

The metal used in solar cells is

asked Jan 27, 2014 by sreemathi.v

1 answer

Which one of the following is a fallacy?

asked Jan 23, 2014 by thanvigandhi_1

1 answer

The bond length is more in

asked Jan 22, 2014 by sreemathi.v

1 answer

If p : Nidhi is a girl and q : Anurag is a boy, then the statement: Nidhi is a girl and Anurag is a boy, is written in symbols as

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Which of the following can act as sink for $CO_2$ and $SO_2$

asked Jan 20, 2014 by sreemathi.v

1 answer

Which of the following is not a statement?

asked Jan 17, 2014 by thanvigandhi_1

1 answer

For which of the following process energy is absorbed?

asked Jan 9, 2014 by sreemathi.v

1 answer

It is given that the events A and B are such that $P(A) = \large\frac{1}{4}\: \: P \bigg( \large\frac{A}{B} \bigg) \large\frac{1}{2}\: and \: P \bigg( \large\frac{B}{A} \bigg) = \large\frac{2}{3}$ Then $P(B)$ is

asked Jan 9, 2014 by thanvigandhi_1

1 answer

The mean and variance of a binomial variate X are 2 and 1 respectively. The probability that X takes a value greater than 1 is

asked Jan 8, 2014 by thanvigandhi_1

1 answer

For two independent events A and B $ P( A \cap B ) = \large\frac{3}{25}\: P(A' \cap B) = \large\frac{8}{25}$ then $ P(B) = $

asked Jan 2, 2014 by thanvigandhi_1

1 answer

The product of 3 numbers in a GP is 64 and the sum of product of numbers taken in pairs is 56. Find the three numbers in GP.

asked Dec 31, 2013 by yamini.v

1 answer

The distance of the point $(1,-5,9) $ from the plane $x-y+z=5$ measured along the line $x=y=z$ is ?

asked Dec 26, 2013 by rvidyagovindarajan_1

1 answer

$\lim\limits_{x\to 0}\large\frac{\sin(\pi\cos^2x)}{x^2}$ equals

asked Dec 20, 2013 by sreemathi.v

1 answer

A roller coaster is designed such that riders experience " weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill is between

asked Dec 14, 2013 by thanvigandhi_1

1 answer

Integrate :$\int \limits_0^3 |2-x|\;dx$

asked Dec 12, 2013 by meena.p

1 answer

The charge required for oxidation of $\large\frac{3}{2}$ mole of $Sn^{2+}$ to $Sn^{4+}$ is

asked Dec 10, 2013 by sreemathi.v

1 answer

The correct sequence which shows the increasing basic strength is

asked Dec 9, 2013 by sreemathi.v

1 answer

The cycas, diploxylic condition is found in :

asked Dec 6, 2013 by thanvigandhi_1

0 answers

In which case electron from bonding molecular orbital is removed?

asked Dec 6, 2013 by sreemathi.v

1 answer

Which of the following is most reactive diene?

asked Dec 4, 2013 by sreemathi.v

1 answer

Select the starting material for the following reaction

asked Dec 3, 2013 by sreemathi.v

1 answer

Endosperm in Cycas is

asked Dec 1, 2013 by thanvigandhi_1

0 answers

The Reductance of 'ns' electrons towards participation in bond formation is known as

asked Nov 26, 2013 by sreemathi.v

1 answer

If a square matrix A is such that $AA^T=I=A^TA$ then $\mid A\mid$ is equal to

asked Nov 25, 2013 by sreemathi.v

1 answer

One of the following is an amphibious plant :

asked Nov 24, 2013 by thanvigandhi_1

0 answers

The scientific term which is not related to the primary constriction of a chromosome is

asked Nov 22, 2013 by thanvigandhi_1

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If one root of the determinant $\begin{vmatrix}x&3&7\\2&x&2\\7&6&x\end{vmatrix}=0$ is $-9$ then the other two roots are

asked Nov 22, 2013 by sreemathi.v

1 answer

Given that $x=-9$ is a root of $\begin{vmatrix}x&3&7\\2 &x&2\\7&6&x\end{vmatrix}$ = 0, the other two roots are

asked Nov 20, 2013 by sreemathi.v

1 answer

Which of the following is incorrect about relationship between $K_p$ and $K_c$?

asked Nov 15, 2013 by mosymeow_1

1 answer

One end of a uniform glass capillary tube of radius $r=0.025\;cm$ is immersed vertically in water to a depth $h=1\;cm$. The excess pressure in $N/m^2$ required to blow an air bubble out of the tube: (Surface tension of water$= 7 \times 10^{-2} N/m$ Density of water$= 10^3 kg/m^3$ Acceleration due to gravity $=10 m/s^2$)

asked Nov 13, 2013 by meena.p

1 answer

One end of a uniform glass capillary tube of radius $r=0.025\;cm$ is immersed vertically in water to a depth $h=1\;cm$. The excess pressure in $N/m^2$ required to blow an air bubble out of the tube: (Surface tension of water$= 7 \times 10^{-2} N/m$ Density of water$= 10^3 kg/m^3$ Acceleration due to gravity $=10 m/s^2$)

asked Nov 13, 2013 by meena.p

0 answers

If $|a| < 1,b= \sum \limits_{k=1} ^{ \infty} \; \large\frac{a^k}{k}$ then a is equal to :

asked Nov 11, 2013 by meena.p

1 answer

If there are 135 hydrogen bonds between two strands of a fragment of DNA double helix which contains 23 Guanine nitrogen basis, what is its total length ?

asked Nov 10, 2013 by thanvigandhi_1

1 answer

The half-lives of two radioactive nuclides A and B are taken separately and allowed to disintegrate for 4 min. What will be the ratio of weights of A and B disintegrated?

asked Nov 8, 2013 by meena.p

0 answers

The radii and Young's moduli of two uniform wires A and B are in the ratio 2: 1 and 1:2 respectively. Both wires are subjected to the same longitudinal force. If the increase in length of the wire A is one percent, the percentage in length of the wire B is :

asked Nov 7, 2013 by meena.p

1 answer

A solid mixture 5g consists of lead nitrate and sodium nitrate was heated below $600^{\large\circ}C$ until weight of residue was conotaut.If the loss in weight is 28%,find the amount of lead nitrate and sodium nitrate mixture.

asked Nov 6, 2013 by sreemathi.v

1 answer

If $ |x| < 1 $ and $y=x-\large\frac{x^2}{2}+\frac{x^3}{3}-\frac{x^4}{4}+......$ then x is equal to :

asked Nov 5, 2013 by meena.p

1 answer

If $\overrightarrow p,\overrightarrow q$ are non collinear vectors, then $[\hat i\:\overrightarrow p\:\overrightarrow q]\hat i+[\hat j\:\overrightarrow p\:\overrightarrow q]\hat j+[\hat k\:\overrightarrow p\:\overrightarrow q]\hat k$=?

asked Nov 1, 2013 by rvidyagovindarajan_1

1 answer

$CFCl_3$ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to from oxygen?

asked Oct 30, 2013 by meena.p

1 answer

Assertion (a) : Ductile metals are used to prepare thin wires. Reason (R) : In the stress - strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

asked Oct 29, 2013 by meena.p

1 answer

Total number of atoms present in $1.0cm^3$ of solid urea (density 0.3g/$cm^3$) at $25^{\large\circ}$ are

asked Oct 28, 2013 by sreemathi.v

1 answer

Study the following lists

asked Oct 25, 2013 by thanvigandhi_1

1 answer

$\large\frac{1}{2}-\frac{1}{2, 2^2}+\frac{1}{3.2^3}-\frac{1}{4.2^4}+.........$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\large\frac{16}{15 R}$$cm$. What is the value of $n_2 ? $ (R=Rydberg constant)

asked Oct 23, 2013 by meena.p

1 answer

The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

asked Oct 23, 2013 by sreemathi.v

1 answer

When a wire of length 10 m is subjected to a force of 100 N along its length, the lateral strain produced is $0.01 \times 10^{-3}\;m$. The Poisson's ratio was found to be 0.4. If the area of cross- section of wire is $0.025\;m^2$, its young's modulus is

asked Oct 22, 2013 by meena.p

1 answer

If $A+B+C=\pi$ then the value of $\sin\large\frac{A}{2}$$+\sin\large\frac{B}{2}$$+\sin\large\frac{C}{2}$ is equal to

asked Oct 18, 2013 by sreemathi.v

1 answer

$\large\frac{1}{1.3}+\frac{1}{2.5}+\frac{1}{3.7}+\frac{1}{4.9}+....=$

asked Oct 16, 2013 by meena.p

1 answer

Identify the correct sequence of plants in the order of characters given below :

asked Oct 16, 2013 by thanvigandhi_1

1 answer

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