Recent questions tagged q12

The sum of first $3$ terms of a G.P is $\large\frac{39}{10}$ and their product is $1$. Find the common ratio and the terms of the G.P.

asked Feb 26, 2014 by rvidyagovindarajan_1

1 answer

A laser beam is used for carrying out surgery because it

asked Feb 25, 2014 by thanvigandhi_1

1 answer

The ratio of the sums of $m\:\:and\:\:n$ terms of an $A.P.$ is $m^2:n^2$. Show that the ratio of $m^{th}\:and\:n^{th}$ term is $(2m-1):(2n-1)$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

An aromatic molecule will

asked Feb 21, 2014 by meena.p

1 answer

Molecule in which the distance between the two adjacent carbon atoms is large is

asked Feb 20, 2014 by meena.p

1 answer

Which of the following species is an intermediate in the reaction shown below :

asked Feb 19, 2014 by sreemathi.v

1 answer

An electron is moving along positive $ x$-axis. A uniform electric field exists along negative $y$-axis. What should be the direction of the magnetic field (constant) so that the force on the electron is zero?

asked Feb 19, 2014 by thanvigandhi_1

1 answer

Write the first five terms of the sequence given by $a_1=-1,\:a_n=\large\frac{a_{n-1}}{n}$$\:for\:n\geq 2$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

The ratio between the rms Speed of $H_2$ at 50K and that of $O_2$ at 800K is :

asked Feb 12, 2014 by sharmaaparna1

1 answer

Find the equations of the bisectors of the angles between the straight lines $3x-4y+6=0$ and $12x+5y-3=0$.

asked Feb 4, 2014 by sreemathi.v

1 answer

General solution of differential equation $x dy -y dx=0$

asked Feb 3, 2014 by meena.p

1 answer

The ionisation isomerism is possible with

asked Jan 31, 2014 by sreemathi.v

1 answer

In pure semiconductor number of conducting electrons is $5 \times 10^{20} $ per cubic meter. How many holes are there in $1 cm^3$ of the same semiconductor.

asked Jan 27, 2014 by meena.p

1 answer

The least electro positive alkali metal is

asked Jan 27, 2014 by sreemathi.v

1 answer

If $ \phi(x) = f(x) + f(1-x), f’(x)<0 \: for\: 0 \leq x \leq 1$, then the tautology among the following is

asked Jan 23, 2014 by thanvigandhi_1

1 answer

The electronic configuration is $1s^1$ for

asked Jan 22, 2014 by sreemathi.v

1 answer

What is the negation of: Ram is in class X or Rashmi is in class XII?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

The sink for dead plants and animals is

asked Jan 20, 2014 by sreemathi.v

1 answer

Which of the following is a statement?

asked Jan 17, 2014 by thanvigandhi_1

1 answer

Heavy water molecule made from $_2 H ^3$ and $O ^{18}$ has a molecular weight of

asked Jan 9, 2014 by sreemathi.v

1 answer

If X is binomial variate with parameters $n$ and $p$ where $ 0 < P < 1$ such that $ \large\frac{P(x=r)}{P(x=n-r)}$ is independent of n and r then p equals.

asked Jan 9, 2014 by thanvigandhi_1

1 answer

If the probability for A to fail in an examination is 0.2 and that for B is 0.3 then the probability that either A or B fails is

asked Jan 8, 2014 by thanvigandhi_1

1 answer

A and B are two horses. The probability of A winning a race is $ \large\frac{1}{3}$ and that of horse B winning the same race, is $ \large\frac{1}{5}$. The probability that none of them will win is :

asked Jan 2, 2014 by thanvigandhi_1

1 answer

If 4 positive numbers a, b, c and d are in HP, which of the following is true.

asked Dec 31, 2013 by yamini.v

1 answer

S1: If momentum of a body increases by 50%, its KE will increase by 125%. S2: KE is proportional to square of velocity.

asked Dec 30, 2013 by thanvigandhi_1

1 answer

If the lines $\overrightarrow r=(\hat i-\hat j+\hat k)+\lambda(2\hat i+3\hat j+4\hat k)\:\:and\:\:\overrightarrow r=(3\hat i+k\hat j)+\mu(\hat i+2\hat j+\hat k)$ intersect then $k=?$

asked Dec 26, 2013 by rvidyagovindarajan_1

1 answer

For $x\in R\lim\limits_{x\to \infty}\big(\large\frac{x-3}{x+2}\big)^x$=

asked Dec 20, 2013 by sreemathi.v

1 answer

A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is $90^{\circ}$ . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is :

asked Dec 14, 2013 by thanvigandhi_1

0 answers

$\int \limits_1^4 \large\frac{2 e^{\Large \sin x^2}}{x}$$=f(k)-f(1)$ then find $k$=? if $\large\frac{d}{dx}$$f(x)=\Large\frac{e^{\sin x }}{\normalsize x}$

asked Dec 12, 2013 by meena.p

1 answer

During discharging of lead steerage battery,which of the following is false ?

asked Dec 10, 2013 by sreemathi.v

1 answer

Using MO theory predict which of the following species has the shortest bond length

asked Dec 9, 2013 by sreemathi.v

1 answer

The brown hairs present at the base of the petiole of Pteris are called :

asked Dec 6, 2013 by thanvigandhi_1

0 answers

$BrO_3^-$ is isostructural with a noble gas species

asked Dec 6, 2013 by sreemathi.v

1 answer

Some alkanes may be prepared by adding an alkyl iodide dropwise to sodium in a suitable inert solvent

asked Dec 4, 2013 by sreemathi.v

1 answer

Select the best starting material for the following reaction

asked Dec 3, 2013 by sreemathi.v

1 answer

*** organs in pteris are produced on

asked Dec 1, 2013 by thanvigandhi_1

0 answers

The structure of $N_2O$ is

asked Nov 26, 2013 by sreemathi.v

1 answer

If $\begin{vmatrix}x-1&5x&7\\x^2-1&x-1&8\\2x&3x&0\end{vmatrix}$ = $ax^3+bx^2+cx+d$ then $c$ is equal to

asked Nov 25, 2013 by sreemathi.v

1 answer

Muhlenbeckia belongs to this category

asked Nov 24, 2013 by thanvigandhi_1

0 answers

Scale bark is seen in

asked Nov 22, 2013 by thanvigandhi_1

0 answers

If $\small\begin{vmatrix}a^2&b^2&c^2\\(a+1)^2&(b+1)^2&(c+1)^2\\(a-1)^2&(b-1)^2&(c-1)^2\end{vmatrix}$ = $k\small\begin{vmatrix}a^2&b^2&c^2\\a&b&c\\1&1&1&\end{vmatrix}$ then the value of $k$ is

asked Nov 22, 2013 by sreemathi.v

1 answer

Which of the following dashed line represents the position at equilibrium for the concentration-time plot of a reaction??

asked Nov 15, 2013 by mosymeow_1

2 answers

A metalic ring of radius r and cross sectional area A is fitted into a wooden circular disc of radius $R(R > 1)$. If the Young's modulus of the material of the ring is Y, the force with which the metal ring expands is :

asked Nov 13, 2013 by meena.p

1 answer

$\sum \limits _{n=1}^{\infty} \large\frac{2n^2+n+1}{n !}$ is equal to :

asked Nov 11, 2013 by meena.p

1 answer

Activity of ligase enzyme is found in :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

An electron is moving in Bohr's fourth orbit. It's de-Broglie wave length is $\lambda$. What is the circumference of the fourth orbit ?

asked Nov 8, 2013 by meena.p

2 answers

A body of mass m is is suspended to an ideal spring of force constant k. The expected change in the position force F acting vertically downwards is :

asked Nov 7, 2013 by meena.p

1 answer

Gastric juice contains 3.0g of HCl per litre.If a person produces 2.5l of gastric juice per day,how many antacid tablets each containing 400mg of $Al(OH)_3$ are needed to neutralized all the HCl produced in one day ?

asked Nov 6, 2013 by sreemathi.v

1 answer

The coefficient of $x^n$ in $\large\frac{1-2x}{e^x}$ is :

asked Nov 5, 2013 by meena.p

1 answer

The angle between the diagonals of a parallelogram $ABCD$, where $\overrightarrow {AB}=3\hat i-2\hat j+2\hat k$ and $\overrightarrow {BC}=-\hat i-2\hat k$ is?

asked Nov 1, 2013 by rvidyagovindarajan_1

1 answer

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