Recent questions tagged set-10

In an experiment for determining the gravitational acceleration g of a place with the help of a simple pendulum , The measured time period square is plotted against the string length of the pendulum in the figure ? What is the value of g at the place ?

asked May 28, 2014 by yamini.v

0 answers

Long range radio transmission is possible when the radio waves are reflected from the ionosphere .For this to happen the frequency of the radiowaves must be in the range :

asked May 28, 2014 by yamini.v

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Given : A and B are input terminals. \[\] Logic 1 = > 5 V\[\] Logic 0 = < 1 V\[\] Which logic gate operation , the following circuit does ?

asked May 28, 2014 by yamini.v

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A piece of wood from a recently cut tree shows 20 decays per minute .A wooden piece of same size placed in a museum (obtained from a tree cut many years back) show 2 decays per minute .If half life of $\;C^{14}\;$ is 5730 years , then age of the wooden piece placed in the museum is approximately :

asked May 28, 2014 by yamini.v

1 answer

In a Young's double slit experiment ,the distance between the two identical slits is 6.1 times larger than the slit width.Then the number of intensity maxima observed with in the central maximum of the single slit diffraction pattern is :

asked May 28, 2014 by yamini.v

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The diameter of the objective lens of microscope makes an angle $\;\beta\;$ at the focus of the microscope . Further, the medium between the object and the lens is an oil of refractive index n . Then the resolving power of the microscope .

asked May 28, 2014 by yamini.v

0 answers

A ray of light is incident from a denser to a rarer medium . The critical angle for total reflection is $\;\theta_{iC}\;$ and the Brewster's angle of incident is $\;\theta_{iB}\;$, such that $\;\large\frac{sin \theta_{iC}}{sin \theta_{iB}}=\eta= \normalsize 1.28\;$ .The relative refractive index of the two media is :

asked May 28, 2014 by yamini.v

1 answer

If denote microwaves , X rays ,infrared ,gamma rays ,ultra - violet , radio waves and visible parts of the electromagnetic spectrum by M ,X,I,G,U,R and V , the following is the arrangement in ascending order of wavelength :

asked May 28, 2014 by yamini.v

0 answers

An example of a perfect diamagnet a superconductor .This implies that when a superconductor is put in a mangetic field of intensity B ,the magnetic field $\;B_{s}\;$ inside the superconductor will be such that :

asked May 28, 2014 by yamini.v

1 answer

A square frame of side 10 cm along straight wire carrying current 1 A are in the plane of the paper . Starting from close to the wire , the frame moves towards the right with a constant speed of $\;10\;ms^{-1}\;$ (see figure) .The e.m.f. induced at the time the left arm of the frame is at x=10 cm from the wire is :

asked May 28, 2014 by yamini.v

1 answer

Four bulbs $\;B_{1},B_{2},B_{3}\;$ and $\;B_{4}\;$ of 100 W each are connected to 220 V main as shown in the figure .The reading in an ideal ammeter will be :

asked May 28, 2014 by yamini.v

1 answer

The gap between the plates of a parallel plate capacitor of area A and distance between plates d , is filled with a dielectric whose permittivity varies linearly from $\;\in_{1}\;$ at one plate to $\;\in_{2}\;$ at the other .The capacitance of capacitor is :

asked May 28, 2014 by yamini.v

1 answer

The electric field in a region of space is given by ,$\;\overrightarrow{E}=E_{0} \hat{i}+ 2 E_{0} \hat{j}\;$ where$\;E_{0}=100\;N/C\;$.The flux of this field through a circular surface of radius 0.02 m parallel to the y - z plane is nearly :

asked May 28, 2014 by yamini.v

0 answers

The total length of a sonometer wire between fixed ends is 110 m .Two bridges are placed to divide the length of wire in ratio 6 :3 :2 .The tension in the wire is 400 N and the mass per unit length is 0.01 kg/m . What is the minimum common frequency with which three parts can vibrate ?

asked May 28, 2014 by yamini.v

0 answers

A body is in simple harmonic motion with time period half second (T=0.5 s) and amplitude one cm (A=1 cm).Find the average velocity in the interval in which it moves from equilibrium position to half of its amplitude .

asked May 28, 2014 by yamini.v

1 answer

A gas molecule of mass M at the surface of the Earth has kinetic energy equivalent at $\;0^{0}C\;$.If it were to go up straight without colliding with any other molecules , how height it would rise ? Assume that the height attained is much less than radius of the earth .($\;k_{B}\;$ is Boltzmann constant)

asked May 28, 2014 by yamini.v

0 answers

A gas is compressed from a volume of $\;2\;m^{3}\;$ to a volume of $\;1\;m^{3}\;$ at a constant pressure of $\;100\;N/m^{2}\;$.Then it is heated at constant volume by supplying 150 J of energy . As a result , the internal energy of the gas is :

asked May 28, 2014 by yamini.v

0 answers

A block coloured solid sphere of radius R and mass M is inside a cavity with vacuum inside .The walls of the cavity are maintained at temperature $\;T_{0}\;$ . The initial temperature of the sphere is $\;3T_{0}\;$.If the specific heat of the material of the sphere varies is $\;\alpha T^{3}\;$ per unit mass with the temperature T of the sphere , where $\;\alpha\;$ is a constant , then the time taken for the sphere to cool down to temperature $\;2T_{0}\;$ will be ($\;\sigma\; is stefan Boltzmann constant$

asked May 28, 2014 by yamini.v

1 answer

A large number of liquid drops each of radius r coalesce to from a single drop radius R.The energy released in the process is converted into kinetic energy of the big drop so formed . The speed of the big drop is (given surface tension of liquid T , density $\;\rho\;$)

asked May 28, 2014 by yamini.v

0 answers

In the diagram shown , the difference in the two tubes of the manometer is 5 cm ,the cross section of the tube at A and B is $\;6\;mm^{2}\;$ and $\;10\;mm^{2}\;$ respectively . The rate at which water flows through the tube is $\;(g=10\;ms^{-2})\;$

asked May 28, 2014 by yamini.v

1 answer

The velocity of water in a river is 18 km/hr near the surface . If the river is 5 m deep , find the shearing stress between the horizontal layers of water.The co - efficient of viscosity of water = $\;10^{-2}\;$ poise .

asked May 28, 2014 by yamini.v

0 answers

The gravitational field in a region is given by $\;\overrightarrow{g}=5\;N/kg\;\hat{i}+12\;N/kg\;\hat{j}\;$.The change in the gravitational potential energy of the particle of mass 2 kg when it is taken from the origin to a point (7m ,-3m) is :

asked May 28, 2014 by yamini.v

0 answers

A ball of mass 160 g is thrown up at an angle of $\;60^{0}\;$ to the horizontal at a speed of $\;10\;ms^{-1}\;$. the angular momentum of the ball at the highest point of the trajectory with respect to the point from which the ball is thrown is nearly $\;(g=10\;ms^{-2})\;$

asked May 28, 2014 by yamini.v

0 answers

A particle is released on a vertical smooth semicircular track from point X so that OX make angle $\;\theta\;$ from the vertical (see figure) .The normal reaction of the track on the particle vanishes at point Y where OY makes angle $\;\phi\;$ with the horizontal .Then :

asked May 28, 2014 by yamini.v

0 answers

Consider a cylinder of mass M resting on a rough horizontal rug that is pulled out from under it with acceleration ' a ' perpendicular to the axis of the cylinder .What is $\;F_{friction}\;$ at point P ? It is assumed that the cylinder does not slip .

asked May 28, 2014 by yamini.v

0 answers

A heavy box is to be dragged along a rough horizontal floor . To do so , person A pushes it at an angle $\;30^{0}\;$ from the horizontal and requires a minimum force $\;F_{A}\;$ , while person B pulls the box at an angle $\;60^{0}\;$ from the horizontal and needs minimum force $\;F_{B}\;$ . If the coefficient of friction between the box and the floor is $\;\large\frac{\sqrt{3}}{5}\;$, the ratio $\;\large\frac{F_{A}}{F_{B}}\;$ is :

asked May 28, 2014 by yamini.v

0 answers

A bullet looses $\;(\large\frac{1}{n})^{th}\;$ of its velocity passing through one plank . The number of such planks that are required to stop the bullet can be :

asked May 28, 2014 by yamini.v

0 answers

How many electrons are involved in the following redox reaction ? $\;Cr_{2}O_{7}^{2-}+Fe^{2+}+Cr_{2}O_{4}^{2-} \to Cr^{3+} + Fe^{3+} + CO_{2}\;$ (unbalanced)

asked May 25, 2014 by yamini.v

1 answer

Amongst $\;LiCl , RbCl , BeCl_{2}\;$ and $\;MgCl_{2}\;$ the compounds with the greatest and the least ionic character , respectively are :

asked May 25, 2014 by yamini.v

0 answers

Nickel (Z=28) combines with a uninegative monodentate ligand to form a diamagnetic complex $\;[NiL_{4}]^{2-}\;$ . The hybridisation involved and the number of unpaired electrons present in the complex are respectively :

asked May 25, 2014 by yamini.v

0 answers

Which of these statements is not true ?

asked May 25, 2014 by yamini.v

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Example of a three - dimensional silicate is :

asked May 25, 2014 by yamini.v

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Amongst the following , identify the species with an atom in +6 oxidation state :

asked May 25, 2014 by yamini.v

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Which one of the following ores is known as Malachite :

asked May 25, 2014 by yamini.v

1 answer

The major product formed when 1,1,1 - trichloro - propane is treated with aqueous potassium hydroxide is :

asked May 25, 2014 by yamini.v

1 answer

Which one of the following is an example of thermosetting polymers ?

asked May 25, 2014 by yamini.v

0 answers

The final product formed when Methyl amine is treated with $\;NaNO_{2}\;$ and $\;HCl\;$ is :

asked May 25, 2014 by yamini.v

1 answer

Which one following compounds will not be soluble in sodium bicarbonate ?

asked May 25, 2014 by yamini.v

0 answers

Williamson synthesis of ether is an example of :

asked May 25, 2014 by yamini.v

0 answers

The reason for double helical structure of DNA is the operation of :

asked May 25, 2014 by yamini.v

1 answer

Among the following organic acids , the acid present in rancid butter is :

asked May 25, 2014 by yamini.v

2 answers

The total number of octahedral void(s) per atom present in a cubic close packed structure is :

asked May 25, 2014 by yamini.v

1 answer

The observed osmotic pressure for a 0.10 M solution of $\;Fe(NH_{4})_{2}(SO_{4})_{2}\;$ at $\;24^{0}C\;$ is 10.8 atm . The expected and experimental (observed) values of Van't Hoff factor (i) will be respectively : $\;(R=0.082\;L\; atm\; k^{-1} mol^{-1})$

asked May 25, 2014 by yamini.v

0 answers

Sulphur dioxide and oxygen were allowed to diffuse through a porous partition .$\;20\;dm^{3}\;$ of $\;SO_{2}\;$ diffuses through the porous partition in 60 seconds .The volume of $\;O_{2}\;$ in $\;dm^{3}\;$ which diffuses under the similar condition in 30 seconds will be (atomic mass of sulphur =32 u):

asked May 25, 2014 by yamini.v

1 answer

Zirconium phosphate $\;[Zr_{3}(PO_{4})_{4}]\;$ dissociates into three zirconium cations of charge +4 and four phosphate anions of charge -3 . If molar solubility of zirconium phosphate is denoted by S and its solubility product by $\;K_{sp}\;$ then which of the following relationship between $\;S\;$ and $\;K_{sp}\;$ is correct ?

asked May 25, 2014 by yamini.v

1 answer

Which one of the following molecules is paramagnetic ?

asked May 25, 2014 by yamini.v

1 answer

Choose the correct statement with respect to the vapour pressure of a liquid among the following :

asked May 25, 2014 by yamini.v

0 answers

Ionization of energy of gaseous Na atoms is $\;495.5\;kJmol^{-1}\;$.The lowest possible frequency of light that ionizes a sodium atom is $\;(h=6.626 \times 10^{-34}\;Js\;N_{A}=6.022 \times 10^{23}\;mol^{-1})\; $

asked May 25, 2014 by yamini.v

0 answers

If the function $\; f(x) = \{ \begin{array} \large\frac{\sqrt{2+cos x}-1}{(\pi-x)^{2}} ,& x \neq \pi \\ k ,& x=\pi \end{array} \;$ is continuous at $\;x=\pi \;$ , then k equals :

asked May 25, 2014 by yamini.v

0 answers

If m is non - zero number and $\;\int \large\frac{x^{5m-1}+2x^{4m-1}}{(x^{2m}+x^{m}+1)^{3}} \normalsize dx= \normalsize f(x)+c\;$ , then $\;\normalsize f(x)\;$ is :

asked May 25, 2014 by yamini.v

0 answers

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