Recent questions tagged jeemain-2014

During the propagation of electromagnetic waves in a medium

asked Apr 7, 2014 by meena.p

1 answer

On heating an aliphatic primary amine with chlooroform and ethanolic potassium hydroxide, the organic compound formed is:

asked Apr 7, 2014 by sreemathi.v

1 answer

The forward biased diode connection is

asked Apr 7, 2014 by meena.p

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Sodium phenoxide when heated with $CO_2$ under pressure at $125^{\large\circ}C$ yields a product which on the acetylation produces $C$.The major product $C$ would be:

asked Apr 7, 2014 by sreemathi.v

1 answer

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times10^3\;Am^{-1}$. The current required to a passed in a solenoid of length $10\; cm$ and number of turns $100$, so that the magnet gets demagnetized when inside the solenoid, is

asked Apr 7, 2014 by meena.p

1 answer

A particles moves with simple harmonic motion in a straight line. In first ${\tau} {s}$ after starting fromrest it travels a distance $a$, and in next ${\tau} {s}$ in travels $2a$ in same direction, then

asked Apr 7, 2014 by meena.p

1 answer

In the reaction,$CH_3COOH\quad\underrightarrow{LiAlH_4}\quad A\quad\underrightarrow{PCl_5}\quad B\quad\underrightarrow {Alc.KOH}\quad C$,the product C is

asked Apr 7, 2014 by sreemathi.v

1 answer

In a large building, there are $15$ bulbs of $40 \;W$, $5$ bulbs of $100\; W$, $5$ fans of $80\; W$ and 1 heater of $1\; kW$. The voltage of the electric mains is $220\; V$. The minimum capacity of the main fuse of the building will be

asked Apr 7, 2014 by meena.p

1 answer

For the rection $SO_2(g)+\large\frac{1}{2}$$O_2(g)\leftrightharpoons SO_3(g)$ if $K_P = K_C (RT)^X$ where the symbols have usual meaning then the value of x is: (assuming ideality)

asked Apr 7, 2014 by sreemathi.v

1 answer

Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

asked Apr 7, 2014 by meena.p

2 answers

The equivalent conductance of NaCl at concentration C and at infinite dilution are $\lambda_C$ and $\lambda_{\infty}$ respectively.The correct relationship between $\lambda_C$ and $\lambda_{\infty}$ is given as : (where the constant B is positive)

asked Apr 7, 2014 by sreemathi.v

1 answer

A student measured the length of a rod and wrote it as $3.50\; cm$.What instrument did he use to measure it?

asked Apr 7, 2014 by meena.p

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For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of $\large\frac{M}{10}$ sulphuric acid.The unreacted acid required 20 mL of $\large\frac{M}{10}$ sodiumhydroxideforcompleteneutralization.The percentage of nitrogen in the compound is:

asked Apr 7, 2014 by sreemathi.v

1 answer

The octahedral complex of a metal ion $M^{3+}$ with four monodentate ligands $L_1, L_2 , L_3$ and $L_4$ absorb wavelengths in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands are

asked Apr 7, 2014 by sreemathi.v

1 answer

A parallel plate capacitor is made of two circular plates separated by a distance of $5mm$ and with a dielectric of dielectric constant $2.2$ between them. When the electric field in the dielectric is $ 3 \times 10^4 \;V/m$, the change density of the positive plate will be close to

asked Apr 7, 2014 by meena.p

1 answer

In $SN_ 2$ reaction, the correct order of reactivity for the following compounds:$CH_3Cl,CH_3CH_2Cl,(CH_3)_2CHCl$ and $(CH_3)_3CCl$ is

asked Apr 7, 2014 by sreemathi.v

1 answer

Match List- I (Electromagnetic wave type) with List-II (Its association/application) and select the correct option from the choices given below the lists :

asked Apr 7, 2014 by meena.p

1 answer

In which of the following reactions $H_2O_2$ acts as a reducing agent ?

asked Apr 7, 2014 by sreemathi.v

1 answer

Consider separate solutions of $0.500\; M$ $C_2 H_5 OH (aq),0.100M $$Mg_3(PO_4)_2(aq),0.250M KBr(aq)$ and $0.125\; M$ $Na_3PO_4(aq)$ at $25^{\large\circ}C$.Which Which statement is true about these solutions, assuming all salts to be strong electrolytes ?

asked Apr 7, 2014 by sreemathi.v

1 answer

An open glass tube is immersed in mercury in such a way that a length of $8\; cm$ extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional $46\; cm$. What will be length of the air column above mercury in the tube now? (Atmospheric pressure = $76\; cm$ of Hg)

asked Apr 7, 2014 by meena.p

1 answer

CsCl crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct ?

asked Apr 7, 2014 by sreemathi.v

1 answer

The current voltage relation of diode is given by $I= (e^{1000 V/T } -1)mA$, where the applied voltage V is in volts and the temperature $T$ is in degree kelvin. If a students makes an error measuring $\pm 0.01\;V$ while measuring the current of $5\;mA$ at $300\;K$, what will be error in the value of current in $mA?$

asked Apr 7, 2014 by meena.p

1 answer

A bob of mass $m$ attached to an inextensible string of length $l$ is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed $\omega\; rad/s$ about the vertical. About the point of suspension

asked Apr 7, 2014 by meena.p

1 answer

Resistance of $0.2\; M$ solution of an electrolyte is $50 \Omega$ . The specific conductance of the solution is $1.4 \;m^{-1}$ . The resistance of $0.5\; M$ solution of the same electrolyte is $280\Omega$ .The molar conductivity of $0.5\;M$ solution of the electrolyte in $S m^2mol^{-1}$ is :

asked Apr 7, 2014 by sreemathi.v

1 answer

A conductor lies along the $z$-axis at $-1.5 \leq z \leq 1.5\;m $ and carries a fixed current of $10.0\;A$ in $-a_{z}$ direction (see figure). For a field $\bar{B}=3.0 \times 10^{-4} e^{-0.2x} \hat a_y\;T$. Find the power required to move the conductor at constant speed to $x = 2.0m, y = 0\;m\;in\; 5 \times 10–3\; s$. Assume parallel motion along the $x$-axis.

asked Apr 7, 2014 by meena.p

1 answer

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is

asked Apr 7, 2014 by sreemathi.v

1 answer

If Z is a compressibility factor, van der Waals equa- tion at low pressure can be written as:

asked Apr 7, 2014 by sreemathi.v

1 answer

The pressure that has to be applied to the ends of a steel wire of length $10\; cm$ to keep its length constant when its temperature is raised by $100^{\circ}$ is (For steel, Young's modulus is $2 \times 10^{11} Nm^{-2}$ and coefficient of thermal expansion is $1.1 \times 10^{-5}K^{-4})$

asked Apr 7, 2014 by meena.p

1 answer

Which one of the following properties is not shown by NO ?

asked Apr 7, 2014 by sreemathi.v

1 answer

If $f_k(x) = \large\frac{1}{k}$$(\sin^k x + \cos^k x)$, where $x\in R$ and $k \geq 1$. The $f_4(x) - f_6(x)$ equals

asked Apr 6, 2014 by balaji.thirumalai

1 answer

If $\alpha, \beta \neq 0$, and $f(n) = \alpha^n+\beta^n$ and $\begin{vmatrix} 3 & 1+f(1) & 1+f(2)\\ 1+f(1)& 1+f(2) &1+f(3) \\ 1+f(2)&1+f(3) & 1+f(4) \end{vmatrix}$$=K(1-\alpha)^2\;(1-\beta)^2\;(\alpha-\beta)^2$, then $K$ is equal to

asked Apr 6, 2014 by balaji.thirumalai

0 answers

If $z$ is a complex number such that $\left|\; z \;\right| \geq 2$ then the minimum value of $\large\left|\normalsize z \normalsize + \large\frac{1}{2} \right |$

asked Apr 6, 2014 by balaji.thirumalai

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The integral $\large\int ($ $1+x- \large\frac{1}{x})$$e^{x+\large\frac{1}{x}}$$dx$ is equal to

asked Apr 6, 2014 by balaji.thirumalai

0 answers

If $A$ is an $3\times 3$ non-singular matrix such that $A A' = A' A$ and $B = A^{-1} A'$, then $B B'$ equals

asked Apr 6, 2014 by balaji.thirumalai

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The statement $\sim(p \leftrightarrow \sim q)$ is

asked Apr 6, 2014 by balaji.thirumalai

1 answer

The integral $\Large \int \limits_{\normalsize 0}^{\normalsize \pi} $$ \sqrt{1 + 4 \sin^2\large\frac{x}{2} \normalsize- \normalsize 4 \normalsize\sin \large\frac{x}{2}}$$\;dx$

asked Apr 6, 2014 by balaji.thirumalai

0 answers

A bird is sitting on top of a vertical pole 20m high and its elevation from point O on the ground is 45 $^{\circ}$. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30$^{\circ}$. Then the speed in m/s of the bird is?

asked Apr 6, 2014 by balaji.thirumalai

0 answers

The variance of the first 50 even natural numbers is:

asked Apr 6, 2014 by balaji.thirumalai

1 answer

If $\large[$$ \vec{a} \times \vec{b}\; \vec{b} \times \vec{c}\; \vec{c} \times \vec{a}$$\large]$$=\lambda \large[$$\vec{a}\vec{b}\vec{c}\large]$$^2$, then $\lambda$ is equal to:

asked Apr 6, 2014 by balaji.thirumalai

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If $a\in R$ and the equation $-3 (x-[x])^2 + 2(x-[x])+a^2 = 0$, (where $[x]$ denotes the greatest integer $\leq x$) has no integral solution, then all possible values lie in the interval:

asked Apr 6, 2014 by balaji.thirumalai

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If the coefficients of $x^3$ and $x^5$ in the expansion of $(1+ax+bx^2)(1-2x)^{18}$ in powers of $x$ are both zero, then $(a,b)$ is equal to:

asked Apr 6, 2014 by balaji.thirumalai

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The image of the line $\large\frac{x-1}{3}$ $ = $$\large\frac{y-3}{1}$$=$ $\large\frac{z-4}{-5}$ in the place $2x-y+z+3=0$ is the line:

asked Apr 6, 2014 by balaji.thirumalai

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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

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