Recent questions tagged q12

What is the time (in sec) required for depositing all the silver present in $125\;mL$ of $1\; M \;AgNO_3$ solution by passing a current of 241.25 A ? (IF=96500 coulombs)

asked Oct 30, 2013 by meena.p

1 answer

To the free end of spring hanging from a rigid support, a block of mass m is hung and slowly allowed to come to its equilibrium position. Then stretching in the spring is d. If the same block is attached to the same spring and allowed to fall suddenly, the amount of stretching is : (force constant , k)

asked Oct 28, 2013 by meena.p

1 answer

Which of the following changes with increases in temperature?

asked Oct 28, 2013 by sreemathi.v

1 answer

From the phytohormones given below, identify the pairs which have mutually opposite influence on seed germination , stem elongation and stomatal movement respectively :

asked Oct 25, 2013 by thanvigandhi_1

1 answer

The coefficient of $x^k$ in the expansion of $\large\frac{1-2x-x^2}{e^{-x}}$ is

asked Oct 24, 2013 by meena.p

1 answer

$CaOCl_2+ H_2O \longrightarrow Ca(OH)_2+X;\;X+CH_3CHO \longrightarrow Y \; ; Y+ Ca(OH)_2 \longrightarrow CHCL_3.$ What is Y?

asked Oct 23, 2013 by meena.p

1 answer

The percentage of an element $m$ is 53 in its oxide of molecular formula $M_2O_3$.Its atomic mass is about

asked Oct 23, 2013 by sreemathi.v

1 answer

The magnitude of maximum acceleration is $\pi$ times that of maximum velocity of a simple harmonic oscillator. The time period of the oscillator in seconds is

asked Oct 22, 2013 by meena.p

1 answer

The smallest positive value of $x$ (in degrees) for which $\tan ( x+100 ^{\circ}$$)=\tan (x+50^{\circ}) \times \tan x \times \tan (x-50^{\circ})$

asked Oct 18, 2013 by sreemathi.v

1 answer

$\sum\limits _{k=1} ^{\infty}$ $\large\frac{1}{k !} \bigg(\sum \limits _{n=1}^k 2^{n-1} \bigg)=$

asked Oct 16, 2013 by meena.p

1 answer

Which of the following statement is not related to Dolichos?

asked Oct 16, 2013 by thanvigandhi_1

1 answer

If $\sin\theta=n\sin(\theta+2\alpha)$ then $tan(\theta+\alpha)$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

Let $f(x)=x^2+ax+b,$ where $a,b \in R$. If $f(x) =0$ has all its roots imaginary, then the roots of $f(x)+f'(x)+f''(x)=0$ are:

asked Oct 9, 2013 by meena.p

1 answer

The maximum value of $4\sin^2x+3\cos^2x+\sin\large\frac{x}{2}$$+\cos\large\frac{x}{2}$ is

asked Oct 7, 2013 by sreemathi.v

1 answer

A wire breaks when subjected to a stress S. If $\rho$ is the density of the material of wire, then the length of the wire. So that it breaks by its own weight is

asked Oct 3, 2013 by meena.p

1 answer

Identify the wrong statement

asked Oct 2, 2013 by thanvigandhi_1

1 answer

$\bigg \{ x \in R: \large\frac{14 x}{x+1}-\frac{9x-30}{x-4} $$<0 \bigg\}=$

asked Sep 26, 2013 by meena.p

1 answer

If $\int \large\frac{\sin ^8 x -\cos ^8 x}{1-2 \sin ^2 x \cos ^2 x}$$dx=A \sin 2x+B,$ then $A=$

asked Sep 20, 2013 by meena.p

1 answer

The set of solutions satisfying both $x^2+5x+6 \geq 0$ and $x^2+3x-4 < 0$ is:

asked Sep 14, 2013 by meena.p

1 answer

$\int \limits_1^3 \large\frac{dx}{2x-1},$ using simpson's rule with 4 equal intervals, The approximate value of $\int \limits_1^3 \large\frac{dx}{2x-1}$=.................. .

asked Sep 13, 2013 by meena.p

0 answers

The equation of the circle passing through (2,1) and touching the co-ordinate axes, is :

asked Sep 13, 2013 by meena.p

1 answer

In which one of the following reactions does the heat change represent the heat of formation of water?

asked Sep 11, 2013 by meena.p

1 answer

A railway truck of mass $\mathit{m}\;= 2 \times 10 ^4\;kg$ travelling at $0.5\; m/s$ collides with another of half of its mass moving in opposite direction with a velocity $0.4\; m/s $. If they collide each other the combined velocity is ................... m/s.

asked Sep 11, 2013 by meena.p

0 answers

A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulting handles:

asked Sep 10, 2013 by meena.p

1 answer

When O-Flurotoluene is treated with sodium amide the product is

asked Aug 26, 2013 by sreemathi.v

1 answer

Refer to the image below :

asked Aug 22, 2013 by sreemathi.v

1 answer

Two satellites have their masses in the ratio $3:1$ The ratio of the orbit (circular ) are $1:4$ then the ratio of total mechanical energy of A and B

asked Aug 10, 2013 by meena.p

1 answer

A ball is dropped from a height of h from ground. If the coefficient of restitution is e, the height to which the ball goes up after it rebounds for the nth time is

asked Jul 17, 2013 by meena.p

2 answers

A car of mass $2 \times 10 ^3 kg$ is to travel over a turn of radius $0.75 km$ and slope of angle $5^{\circ}$ If coefficient of friction between wheel and road is 0.5 maximum speed the car can travel with out slipping is $(\tan 5^{\circ}=0.087)$

asked Jul 5, 2013 by meena.p

1 answer

If the equation $y=A \cos (Bx-Ct)$ describe the motion of objects ( where $x$ and $y$ are displacements, $t$ is time ), what must be the units of variables $A,B$ and $C$ ?

asked Jun 17, 2013 by meena.p

1 answer

The parametric equations of the curve $x^{2/3}+y^{2/3}=a^{2/3}$ are

asked May 15, 2013 by poojasapani_1

1 answer

If $I$ is the unit matrix of order $n$. Where$K\neq 0$ is a constsnt , then adj (KI)=

asked May 7, 2013 by poojasapani_1

1 answer

Find the volume of the solid that results when the region enclosed by the given curve: $(11$$to14)$ $2ay2=x(x-a)2$ is revolved about $x$-axis ,$a>0$

asked Apr 28, 2013 by poojasapani_1

1 answer

Construct the consumer price index number for 1990,taking 1989 as the base year and using simple average of price relative method for the following data :

asked Apr 22, 2013 by sreemathi.v

0 answers

Sample of polythene bags from a manufacturer are tested by a buyer for bursting pressure with the following data :

asked Apr 22, 2013 by sreemathi.v

1 answer

Calculate the lower $(Q_1$) and upper $(Q_3)$ quartiles for the following distribution :

asked Apr 19, 2013 by sreemathi.v

0 answers

The number of letters in hundreds received in a town on each day of a fortnight is given below :

asked Apr 19, 2013 by sreemathi.v

0 answers

The average number,in lakhs,of working days lost in strikes during each year of the period 1981-90 was :

asked Apr 18, 2013 by sreemathi.v

0 answers

Calculate the index number for the year 1979 with 1970 as base from the following data using weighted average of price relatives :

asked Apr 18, 2013 by sreemathi.v

0 answers

The table below gives details of the electricity generated in million kilowatt hours in each quarter for the years 2002 to 2004.

asked Apr 17, 2013 by sreemathi.v

0 answers

The quotations for four different commodities for the years 2000 and 2005 are given below.Calculate the index number for 2005 with 2000 as the base year by using the weighted average of price relatives method.

asked Apr 17, 2013 by sreemathi.v

0 answers

Solve the following differential equation; $(D^{2}+5)$$y=\cos^{2}$$x$

asked Apr 16, 2013 by poojasapani_1

1 answer

The production of a soft drink company in thousands of litres during each month of a year is as follows :

asked Apr 16, 2013 by sreemathi.v

1 answer

Calculate the index number for 2005 with 2000 as the base year by the weighted aggregate method.

asked Apr 16, 2013 by sreemathi.v

1 answer

Given $\overrightarrow{a}=i-2j+k,\overrightarrow{b}=2i+j+k$ and $\overrightarrow{c}=i+2j-k$.Find $\overrightarrow{a}\times(\overrightarrow{b}\times \overrightarrow{c})$

asked Apr 15, 2013 by sreemathi.v

0 answers

Find $\overrightarrow{a}.\overrightarrow{b}$ if $ \mid\overrightarrow{a}\mid=2, \mid\overrightarrow{b}\mid=5$ and $\mid \overrightarrow{a}\times \overrightarrow{b}\mid$=8.

asked Apr 15, 2013 by sreemathi.v

0 answers

An insurance company insured 4000 doctors,8000 teachers and 12,000 engineers.The probabilities of a doctor,a teacher and an engineer dying before the age of 58 years are 0.01 ,0.03 and 0.05 respectively.If one of the insured persons dies before the age of 58 years,find the probability that he is a doctor.

asked Apr 15, 2013 by sreemathi.v

0 answers

The mean and variance of a binomial distribution are 4 and 2 respectively .Find the probability of at least 6 successes.

asked Apr 15, 2013 by sreemathi.v

0 answers

Five bad eggs are mixed with 10 good ones.If three eggs are drawn one by one with replacement ,find the probability distribution of the number of goods eggs drawn.

asked Apr 12, 2013 by sreemathi.v

1 answer

A factory has three machines A,B and C producing 1,500,2,500 and 3,000 bulbs per day,respectively.Machine A produces 1.5% defective bulbs,machine B produces 2% defective bulbs and machine C produces 2.5% defective bulbs.At the end of the day,a bulb is drawn at random and is found to be defective.What is the probability that this defective bulb has been produced by machine B?

asked Apr 12, 2013 by sreemathi.v

1 answer

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