Recent questions tagged mock

Two balls of equal masses moving with $\;10 \;ms^{-1}\;$ towards each other collide after some time . Considering the collision to be inelastic & mass of each ball to be 1 kg , the thermal energy developed in the process is equal to what?

asked Mar 12, 2014 by yamini.v

1 answer

Given the polymers arrange them in the decreasing order of their inter molecular forces: A=Nylon 6,6 B = Buna-S and C=Polythene.

asked Mar 11, 2014 by thanvigandhi_1

1 answer

In the figure below, $N_2$ and $H_2$ are sent into the metre pipe through the two ends. At what distance $x$ will Ammonia be formed.

asked Mar 11, 2014 by balaji.thirumalai

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Match the following column-I and column-II

asked Mar 11, 2014 by sreemathi.v

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The ratio of Boyle's temperature and critical temperature for a gas is

asked Mar 9, 2014 by sharmaaparna1

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The arrangement of $(CH_3)_3C-,(cH_3)_2CH-,CH_3CH_2-$ when attached to benzene or an unsaturated group, in increasing order of inductive effect is

asked Mar 5, 2014 by meena.p

1 answer

Diazo compounds,sometimes donot respond Lassaigne's test for nitrogen because

asked Mar 4, 2014 by sreemathi.v

1 answer

The following equation shows the conversion of limes stone to lime $CaCO_3(s)\longrightarrow CaO(s) + CO_2(g)$. The values of $\Delta H^\circ$ and $\Delta S^\circ$ are $+179.1\; kJ$ and $160.2\; J/K$ respectively at $298\; K$ and $1\; bar$. Assuming that $\Delta H^\circ$ and $\Delta S^\circ$ do not change with temperature, minimum temperature above which conversion of lime stone to lime will be spontaneous is

asked Feb 28, 2014 by mosymeow_1

1 answer

Which of the following have asymmetric carbon atom ?

asked Feb 22, 2014 by meena.p

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An observer can see through a pin hole the top end of a thin rod of height h, placed as shown. The beaker height is 3 h and its radius is h. When the beaker is filled with a liquid up to a height 2h ,he can see the lower end of the rod. Then RI of liquid is .

asked Feb 19, 2014 by meena.p

1 answer

$CuSO_4$ solution(250ml) was electrolysed using a platinum anode and a copper cathode.At constant current of 2mA was passed for 16 minutes.It was found that after electrolysis the absorbance of this solution was reduced to 50% of its original value.Then the concentration of copper sulphate in solution to begin with is

asked Feb 17, 2014 by sreemathi.v

1 answer

For the following disproportion reaction $3Br_2+6OH^{-}\rightarrow 5Br^-+BrO_3^-+3H_2O$. Correct statement below is (Given $Br_2$ molecular mass is 160)

asked Feb 14, 2014 by sreemathi.v

1 answer

Lets say you enter a Chess tournament. The probability of winning a game against half the players is 0.3, the probability of winning against one quarter of them is 0.4 and the probability of winning against the remaining one quarter is 0.5. Let's say you play against a randomly chosen opponent. What is your probability of winning?

asked Feb 12, 2014 by balaji.thirumalai

1 answer

The hydrogen-like species $Li^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$ has one radial node and its energy is equal to the ground state energy of hydrogen atom. The orbital angular momentum quantum number of the state $S_2$ is

asked Feb 10, 2014 by sharmaaparna1

1 answer

If the line $y=mx+c$ touches the hyperbola $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ then find the value of c .

asked Feb 10, 2014 by sreemathi.v

1 answer

Eliminate arbitrary constant and obtain differential equation $x^2-y^2= a(x^2+y^2)^2$

asked Feb 7, 2014 by meena.p

1 answer

When chlorine water is added to an aqueous solution of potassium halide in the presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution.

asked Feb 1, 2014 by mosymeow_1

1 answer

In the circuit given below the value of current is :

asked Jan 31, 2014 by meena.p

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$2K_3Fe(CN)_6+2KOH\rightarrow x+y+z$,$H_2O_2+z\rightarrow y+w$. The $x$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

Sum of first $n$ terms of an $AP$ is $kn^2$, sum of their squares will be

asked Jan 22, 2014 by yamini.v

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The ratio of the coefficient of $x^{10}$ in $(1-x^2)^{10}$ and the term independent of $x$ in $(x-\large\frac{2}{x}$$)^{10}$ is ?

asked Jan 21, 2014 by rvidyagovindarajan_1

1 answer

$NO_2$ combines with atmospheric moisture to form mixture of $2NO_2+H_2O\rightarrow y + HNO_3$.The y is

asked Jan 21, 2014 by sreemathi.v

1 answer

Which statement is logically equivalent to "If Yoda cannot use a lightsaber, then he cannot help Luke win the battle."

asked Jan 18, 2014 by thanvigandhi_1

1 answer

If $A(4,7,8),\:B(2,3,4),\:C(2,5,7)$ are vertices of a triangle then the length of internal bisector of angle $A$ is ?

asked Jan 12, 2014 by rvidyagovindarajan_1

1 answer

The value of $f(0)$ so that $f(x)=\large\frac{(4^x-1)^3}{\sin\big(\Large\frac{x}{4}\big) \normalsize {\log}(1+\Large\frac{x^2}{3}\big)}$ is continuous everywhere is

asked Jan 6, 2014 by sreemathi.v

1 answer

The length of median through $A$ of the $\Delta\:ABC$ where $\overrightarrow {AB}=3\hat i+4\hat k\:\:and\:\:\overrightarrow {AC}=5\hat i-2\hat j+4\hat k$ is ?

asked Dec 30, 2013 by rvidyagovindarajan_1

1 answer

Evaluate: $\large \int \frac {1 + \tan^2 x} {\sqrt (1 - \tan^2 x)}\; $$dx$

asked Dec 22, 2013 by balaji.thirumalai

1 answer

The volume of gases $H_2, \;CH_4, \;CO_2$ and $NH_3$ absorbed by 1 gm of activated charcoal at 298 K are in the order:

asked Dec 14, 2013 by mosymeow_1

1 answer

When a damped spring mass system is forced into oscillations at different frequencies it resonates (amplitude increases and peaks when compared to input amplitude) at its damped natural frequency. For such systems the resonance of acceleration is more when

asked Dec 10, 2013 by meena.p

1 answer

A kid of mass M stands at the edge of a platform of radius r which can freely rotate about its axis. The moment of inertia of platform is I. The system is at rest when a friend throws a ball of mass m and the kid catches it. If the velocity of the ball is v horizontally along the tangent to the edge of the platform when it was caught by the kid, find the angular speed of the platform after the event.

asked Nov 28, 2013 by meena.p

1 answer

The dissociation constant of certain weak acid HA is $1 \times 10^{-4}$. The equilibrium constant for its reaction with strong base BOH is

asked Nov 27, 2013 by mosymeow_1

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

In how many ways can a mixed doubles game in tennis can be arranged from 5 couples, if no husband and wife play in the same game?

asked Nov 23, 2013 by rvidyagovindarajan_1

1 answer

Solve for $x$: $\tan^{-1}x+2\cot^{-1}x=\large\frac{2\pi}{3}$.

asked Nov 15, 2013 by sreemathi.v

1 answer

A tank filled with water has a hole at a certain height from its bottom. The volume of water emerging out per second from the hole does not depend on

asked Oct 2, 2013 by meena.p

1 answer

An artificial satellite of mass m moves in an orbit whose radius is n times the radius of earth. Assuming the resistance to the motion is proportional to square of velocity ie $F= av^2$ where a is a constant. How long will the satellite take to fall to earth. M-mass of earth R- radius of earth

asked Aug 26, 2013 by meena.p

1 answer

A block of mass m is being pulled up a rough inclined by an agent delevering constant power P. The coefficient of friction between block and incline is $\mu$. The maximum speed of the block during the course of ascent is

asked Aug 6, 2013 by meena.p

1 answer

If $z$ is a complex number having non zero imaginary part and $z^2+z+1=a$ where $a$ is real, then $a$ cannot take which of the following values?

asked Aug 5, 2013 by rvidyagovindarajan_1

1 answer

A block is placed on a rough inclined plane of inclination $\theta=30 ^{\circ}$ . If the force to drag it along the plane is to be smaller than to lift it, the coefficient of friction $\mu$ should be less than

asked Jul 11, 2013 by meena.p

1 answer

A ball is dropped from the roof of a tower of height h.The total distance covered by it in the last second of its motion is equal to the distance covered by it in first three seconds.The value of h is $(g=10 m/s^2)$

asked Jul 1, 2013 by meena.p

1 answer

Resistance of metal is given by $R=\large\frac{V}{I}$. $V$ is potential difference, $I$ is current. In a circuit $V=(8 \pm 0.5)v$ and current is $I=(2 \pm 0.2)A$. what is value of resistance with percentage error?

asked Jun 19, 2013 by meena.p

1 answer

If a relation $R$ on the set $\{1,2,3\}$ is defined as $R=\{(1,2)\}$, then $R$ is

asked May 31, 2013 by rvidyagovindarajan_1

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