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Steel ruptures when a shear of $\;3.5 \times 10^{8}\;Nm^{-2}\;$ is applied .The force needed to punch a 1 cm diameter hole in a steel sheet 0.3 cm thick is nearly :

asked May 23, 2014 by yamini.v

0 answers

Two hypothetical plates masses $\;m_{1}\;$ and $\;m_{2}\;$ are at rest when they are infinite distance apart .Because of the gravitational force they move towards each other along the line joining their centers .What is their speed when their separation is 'd ' ? (Speed of $\;m_{1}\;$ is $\;v_{1}\;$ and that of $\;m_{2}\;$ is $\;v_{2}\;$)

asked May 23, 2014 by yamini.v

1 answer

A particle is moving in a circular path of radius a , with a constant velocity v as shown in the figure . The center of circle is marked by 'C' .The angular momentum from the origin O can be written as :

asked May 23, 2014 by yamini.v

1 answer

A spring of unstretched length l has a mass m with one end fixed to a rigid support .Assuming spring to be made of a uniform wire , the kinetic energy possessed by it if its free end is pulled with uniform velocity v is :

asked May 23, 2014 by yamini.v

1 answer

A 4 g bullet is fired horizontally with a speed of 300 m/s into 0.8 kg block of wood at rest on a table .If the coefficient of friction between the block and the table is 0.3 , how far will the block side approximately ?

asked May 23, 2014 by yamini.v

1 answer

Three masses m,2m and 3m are moving in x - y plane with speed 3u,2u and u respectively as shown in figure . The three masses collide at the same point at P and stick together .The velocity of resulting mass will be :

asked May 23, 2014 by yamini.v

0 answers

A person climbs up a stalled escalator in 60 s .If standing on the same but escalator running with constant velocity he takes 40 s.How much time is taken by the person to walk up the moving escalator ?

asked May 23, 2014 by yamini.v

0 answers

From the following combinations of physical constants (expressed through their usual symbols) the only combination , that would have the same value in different systems of units , is :

asked May 23, 2014 by yamini.v

1 answer

In the experiment of calibration of voltmeter , a standard cell of e.m.f.1.1 volt is balanced against 440 cm of potentiometer wire .The potential difference across the ends of resistance is found to balance against 220 cm of the wire . The corresponding reading of voltmeter is 0.5 volt .The error in the reading of voltmeter will be :

asked May 23, 2014 by yamini.v

0 answers

For sky wave propagation , the radio waves must have a frequency range in between :

asked May 23, 2014 by yamini.v

0 answers

For LED's to emit light in visible region of electromagnetic light , it should have energy band gap in the range of :

asked May 22, 2014 by yamini.v

0 answers

A piece of bone of an animal from a ruin is found to have $\;^{14}C\;$ activity of 12 disintegrations per minute per gm of its carbon content .The $\;^{14}C\;$ activity of a living animal is 16 disintegrations per minute per gm .How long ago nearly did the animal die ? (Given half life of $\;^{14}C\;$ is $\;t_{\large\frac{1}{2}}\;$=5760 years)

asked May 22, 2014 by yamini.v

1 answer

A beam of light has two wavelengths $\;4972A^{0}\;$ and $\;6216A^{0}\;$ with a total intensity of $\;3.6 \times 10^{-3} \;Wm^{-2}\;$ equally distributed among the two wavelengths . The beam falls normally on the area of $\;1\;cm^{2}\;$ of a clean metallic surface of work function 2.3 eV.Assume that there is no loss of weight by reflection and that each capable photon ejects one electron .The number of photo electrons liberated in 2s is approximately :

asked May 22, 2014 by yamini.v

0 answers

The major product obtained in the photo catalysed bromination of 2 - methylbutane is :

asked May 22, 2014 by yamini.v

0 answers

In the presence of peroxide , HCl and HI do not give anti - Markownikoff's addition to alkenes because :

asked May 22, 2014 by yamini.v

0 answers

Conversion of benzene diazonium chloride to chloro benzene is an example of which of the following reactions ?

asked May 22, 2014 by yamini.v

2 answers

In the victor - Meyer's test , the colour given by $\;1^{0},2^{0}\;$ and $\;3^{0}\;$ alcohols are respectively :

asked May 22, 2014 by yamini.v

0 answers

Which one of the following complexes will most likely absorb visible light ? (At nos. Sc=21,Ti=22,V=23,Zn=30)

asked May 22, 2014 by yamini.v

1 answer

Hydrogen peroxide acts both as an oxidising and as reducing agent depending upon the nature of the reacting species . In which of the following cases $\;H_{2}O_{2}\;$ acts as a reducing agent in acid medium ?

asked May 22, 2014 by yamini.v

0 answers

Global warming is due to increase of :

asked May 22, 2014 by yamini.v

0 answers

Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species $\;O^{2-} ,S^{2-} ,N^{3-} ,P^{3-}\;$ ?

asked May 22, 2014 by yamini.v

1 answer

Similarity in chemical properties of the atoms of elements in a group of the atoms of periodic table is most closely related to :

asked May 22, 2014 by yamini.v

0 answers

Among the following species the one which causes the highest CFSE , $\;\bigtriangleup_{0}\;$ as a ligand is :

asked May 22, 2014 by yamini.v

0 answers

Copper becomes green when exposed to moist air for a long period . This is due to :

asked May 22, 2014 by yamini.v

0 answers

Which one of the following exhibits the largest number of oxidation states ?

asked May 22, 2014 by yamini.v

0 answers

Excited hydrogen atom emits light in the ultraviolet region at $\;2.47 \times 10^{15}\;Hz\;$.With this frequency , the energy of a single photon is :$\;(h=6.63 \times 10^{-34}\;Js) $

asked May 22, 2014 by yamini.v

0 answers

Which one of the following xenon - OXO compounds may not be obtained by hydrolysis of xenon fluorides ?

asked May 22, 2014 by yamini.v

1 answer

The standard enthalpy of formation $\;(\bigtriangleup_{f}H_{298}^{o})\;$ for methane, $\;CH_{4}\;$ is $\;-74.9\;kJmol_{-1}\;$.In order to calculate the average energy given out in the formation of a C - H bond from this it is necessary to know which one of the following ?

asked May 22, 2014 by yamini.v

0 answers

In a monoclinic unit cell , the relation of sides angles are respectively :

asked May 22, 2014 by yamini.v

0 answers

The conjugate base of hydrazoic acid is :

asked May 22, 2014 by yamini.v

1 answer

The entropy $\;(S^{0})\;$ of the following substances are :\[\]$\;CH_{4}\;(g)\;186.2\;JK^{-1}mol^{-1}\;$\[\]$\;O_{2}\;(g)\;205.0\;JK^{-1}mol^{-1}\;$\[\]$\;CO_{2}\;(g)\;213.6\;JK^{-1}mol^{-1}\;$\[\]$\;H_{2}O\;(l)\;69.9\;JK^{-1}mol^{-1}\;$\[\]The entropy change $\;(\bigtriangleup S^{0})\;$ for the reaction\[\]$\;CH_{4}(g) + 2O_{2}(g) \to CO_{2}(g) +2H_{2}O(l) \;$ is :

asked May 22, 2014 by yamini.v

0 answers

How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate ? (Atomic mass of copper =63.5 u $\;N_{A}\;$ = Avogadro's constant) :

asked May 22, 2014 by yamini.v

0 answers

The rate coefficient (k) for a particular reactions is $\;1.3 \times 10^{-4}\;M_{-1}s^{-1} \;$ at $\;100^{0}C\;$ , and $\;1.3 \times 10^{-4}\;M_{-1}s^{-3} \;$ at $\;150^{0}C\;$ . What is the energy of the activation $\;(E_{A})\;$ (in kJ) for this reaction ? (R = molar gas constant=8.314$\;JK^{-1} mol^{-1}\;$)

asked May 22, 2014 by yamini.v

0 answers

The amount of $\;BaSO_{4}\;$ formed upon mixing 100 mL of $\;20.8\% BaCl_{2}\;$ solution with 50 mL of $\;9.8\%\;$ of $\;H_{2}SO_{4}\;$ solution will be : (Ba=137, Cl=35.5, S=32 ,H=1 and O=16)

asked May 22, 2014 by yamini.v

0 answers

What happens when an alert gas is added to an equilibrium keeping volume unchanged ?

asked May 22, 2014 by yamini.v

0 answers

The de - Broglie wavelength of a particle of mass 6.63 g moving with a velocity of $\;100\;ms^{-1}\;$ is :

asked May 22, 2014 by yamini.v

0 answers

If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom , the total energy of the revolving electron will be :

asked May 22, 2014 by yamini.v

1 answer

Phthalic acid reacts with resorcinol in the presence of concentrated $\;H_{2}SO_{4}\;$ to give :

asked May 22, 2014 by yamini.v

0 answers

Which of the following will not show mutarotation ?

asked May 21, 2014 by yamini.v

0 answers

Aminoglycosides are usually used as :

asked May 21, 2014 by yamini.v

1 answer

Which one of the following acids does not exhibit optical isomerism ?

asked May 21, 2014 by yamini.v

0 answers

Which of the following molecules has two sigma $\sigma\;$ and two pi $\pi\;$ bonds ?

asked May 21, 2014 by yamini.v

0 answers

Let p,q,r denote arbitrary statements . Then the logically equivalent of the statement $\;p \Rightarrow (q \lor r)\;$ is :

asked May 21, 2014 by yamini.v

0 answers

If $\;f(\theta) = \begin{vmatrix} 1 & cos\theta &1 \\[0.3em] -sin\theta & 1 & \cos \theta \\[0.3em] -1 & sin \theta & 1\end{vmatrix}\;$ and A and B are respectively the maximum and the minimum values of $\;f(\theta)\;$ , then (A ,B) is equal to :

asked May 21, 2014 by yamini.v

0 answers

Statement I : The equation $\;(sin^{-1} x)^{3} + (cos^{-1} x)^{3} - a \pi^{3}=0\;$ has a solution for all $\;a \geq \large\frac{1}{32}\;$ .\[\] Statement II : For any $\;x \in R\;, sin^{-1}x+cos^{-1}x=\large\frac{\pi}{2}\;$ and $\; 0 \leq (sin^{-1}x - \large\frac{\pi}{4})^{2} \leq \large\frac{9 \pi^{2}}{16}\;$ .

asked May 21, 2014 by yamini.v

0 answers

A number x is chosen at random from the set $\;\{ 1,2,3,4,...,100\}\;$ .Define the event : A= the chosen number x satisfies $\;\large\frac{(x-10)(x-50)}{(x-30)} \geq 0\;$ Then P(A) is :

asked May 21, 2014 by yamini.v

0 answers

Let $\;\overline{x}\;$ M.D. be the mean and the mean deviation about $\;\overline{x}\;$ on n observations $\;x_{i} , i=1,2,...,n\;$.If each of the observations is increased by 5 , then the new mean and the mean deviation about the new mean , respectively , are :

asked May 21, 2014 by yamini.v

0 answers

If $\;\hat{x} , \hat{y}\;$ and $\;\hat{z}\;$ are three unit vectors in three - dimensional space , then the minimum value of $\;|\hat{x} + \hat{y}|^{2} + |\hat{y} + \hat{z}|^{2} + |\hat{z} + \hat{x}|^{2}\;$ :

asked May 21, 2014 by yamini.v

0 answers

If the distance between planes , $\;4x - 2y -4z+1=0\;$ and $\;4x - 2y -4z+d=0\;$ is 7 , then d is :

asked May 21, 2014 by yamini.v

0 answers

A symmetrical form of the line of intersection of the planes $\;x=ay+b\;$ and $\;z=cy+d\;$ is :

asked May 21, 2014 by yamini.v

0 answers

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