Recent questions tagged student-questions

An aqueous solution of electrolyte $Ag_2SO_4$ was electrolyzed in a cell having platinum electrodes till 1.6 g of oxygen was liberated at the anode . What was the mass of silver deposited at the cathode ?

asked Oct 29, 2019 by meena.clay6

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p- Block elements from acidic, basic and amphoteric oxide . Explain each property by giving two examples and also write the reactions of these oxides with water

asked Oct 29, 2019 by meena.clay6

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For the following reaction in equilibrium $pcl_s(g) \rightleftharpoons pcl_3(g) +cl_2(g)$ vapour density is found to be 100 when 1 mole of $Pcl_5$ in a 10 litre flask at $27^{\circ}$ calculate the equilibrium pressure

asked Oct 29, 2019 by meena.clay6

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There are two conducting spheres of radius a and b (b > a) carrying equal and opposites changes . They are placed at a separation d( >>> a and b) The capacitance of the system is

asked Oct 14, 2019 by meena.clay6

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A stone is dropped into a well in which the level of water is h below top of the well if v is velocity of sound the time t after which the splash is heard is given by

asked Oct 14, 2019 by meena.clay6

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If the linear momentum is increased by 5% , the kinetic energy will increase by :

asked Oct 14, 2019 by meena.clay6

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If $\log 2,\log(2^n-1)$ and $\log (2^b+3)$ are in Ap, then n=?

asked Oct 11, 2019 by meena.clay6

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Four circles each with radius 2 touch both the axes then the radius of the largest circle touching all the four circles is :

asked Oct 11, 2019 by meena.clay6

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There are 10 turns in coil N. If a current of 2A is Passed through coil M then the flux linked with coil N is $1.8 \times 10^{-3}\;Wb$ If a current of 3A is passed through coil N then flux linked with coil M is :

asked Oct 10, 2019 by meena.clay6

1 answer

In Milikan's oil drop experiment , an oil drop of radius r and charge q is held in equilibrium between the plates of a charged parallel-plate capacitor when the potential difference is V. To keep a drop of radius 2r and with a charge 2q in equilibrium between the plates the potential difference V required is

asked Oct 10, 2019 by meena.clay6

1 answer

New industrial plants for production of acetic acid, involve reaction of liquid methanol with CO in the presence of a catalyst. $CH_3OH(I)+CO(g) \to CH_3COOH(g)$ In an experiment 16 g of methanol and 16 of carbon monoxide were placed in reaction vessels. What is the theoretical yield of acetic acid ? If the actual is 22.0 g what is its percentage yield ?

asked Oct 10, 2019 by meena.clay6

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Which of the following sets of force of acting simultaneously on a particle keep it in equilibrium ?

asked Oct 4, 2019 by meena.clay6

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Area$=3.4mm^2$ and l=400m and $p(\rho)=1.2*10^{-5}$ then what is resistance

asked Oct 4, 2019 by meena.clay6

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Two particles came towards each other with speed of 0.8c with respect to laboratory. What is their relative speed?

asked Oct 4, 2019 by meena.clay6

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The effective resistance between A and B in given circuit is

asked Oct 4, 2019 by meena.clay6

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A current of 3A flows in a circuit shown in the figure. The potential difference between A and B is

asked Oct 3, 2019 by meena.clay6

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Two particles start moving towards each other will constant acceleration of $ 1\;m/s^2$ . If their initial separation is 100 m, find after what time they will meet each other

asked Oct 3, 2019 by meena.clay6

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A person standing on an escalator takes time $t_1$ to reach the top of a tower when the escalator is moving. He takes time $t_2$ to reach the top of the tower when the escalator is standing . How long will he take if he walks up a moving escalator ?

asked Oct 3, 2019 by meena.clay6

1 answer

A particle x moves uniformly with velocity a vector ,the motion firected in duch a way that a vector always pointed at the another particle y the direction of motion of second particle having velocity b is perpendicular to that x.The initial distance between particle is equal to d.how soon the particle will meet..

asked Oct 3, 2019 by meena.clay6

1 answer

A mass 2m lies on a fixed, smooth cylinder. An ideal string attached to 2m passes over the cylinder to mass m. Then the value of angle $\theta$ for which system is in equilibrium

asked Oct 3, 2019 by meena.clay6

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Find the tension in the chain at a distance Y from the support. Mass of chain is M.

asked Oct 1, 2019 by meena.clay6

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Eleven forces each equal to 5N act on a particle simultaneously . If each force makes an angle $30^{\circ}$ with the next one, the resultant of all forces is

asked Oct 1, 2019 by meena.clay6

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Derive $l= 4l _1\cos ^2(\phi/2)$ where $\phi$=Phase difference of two waves

asked Oct 1, 2019 by meena.clay6

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Total moles of all gases in mixture when 4 mole of $N_2$ is allowed to react with 4 mole of $H_2$ to produce $NH_3$ will be

asked Oct 1, 2019 by meena.clay6

1 answer

A ball is thrown up from the top of a tower with an initial velocity of 10m/s at an angle of $30^{\circ}$ with horizontal . It hits the ground at a distance of $17.3\;m$ from the base of tower . Calculate the height of the tower $(g=10\;m/s^2)$

asked Oct 1, 2019 by meena.clay6

1 answer

When two projectiles are fired from ground with same speed at complementary angles of projection having time of flight $T_1$ and $T_2$ and maximum height $H_1$ and $H_2$ respectively . Which of the following is incorrect ?

asked Oct 1, 2019 by meena.clay6

1 answer

The resistance is $101.6 \Omega$ at the triple - point of water $273.16\;k$ and $165.5 \Omega$ at the normal melting point of lead $(600.5\;K)$ What is the temperature when the resistance is $123.4\;\Omega$

asked Oct 1, 2019 by meena.clay6

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Consider the given ions and their number of unpaired electrons. The correct order is

asked Sep 30, 2019 by meena.clay6

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The volume of Sulphuric acid 98% (w/w) having density $1.84 gl\;cm^3$ required to prepare five litre of $0.5\;M$ Solution

asked Sep 30, 2019 by meena.clay6

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When a man stands on a moving escalator the goes up in 50 sec and when he goes up in 30 sec. Then the man walks up the stationary escalator in a time of ________- sec

asked Sep 30, 2019 by meena.clay6

1 answer

Three blocks of masses $m_1,m_2$ and $m_3$ are connected are shown in the figure. All the surfaces are friction less and the pulleys are light. Fixed the acceleration of $m_1$

asked Sep 30, 2019 by meena.clay6

1 answer

A particle moving with uniform acceleration has its final velocity $(\theta= \sqrt{150+8x})m/s$ Where x is the distance travelled by the body. Then the acceleration is

asked Sep 30, 2019 by meena.clay6

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A proton accelerated from rest through a photo difference of volt has a wave length l associated with it. An alpha particle in order to have the wavelength must be accelerated through a potential difference of

asked Sep 30, 2019 by meena.clay6

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A wire of lenth l and cross section A streched by x then what is workdone against?Having youngs modulus Y

asked Sep 30, 2019 by meena.clay6

1 answer

Which of the following gives blue colour during the test for nitrogen sodium extract

asked Sep 30, 2019 by meena.clay6

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A single electron orbits around a stationary nucleus of charge +ze , where z is a constant and e is magnitude of electronic charge. It requires 47.2eV to exite the electron from $\;2^{nd}\;$ Bohr orbital to $\;3^{rd}\;$ Bohr orbital. find the atomic no.of element.The wavelength of radiation required remove electron from first Bohr's orbit to infinity is

asked Sep 30, 2019 by meena.clay6

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What is meant by Turion ?

asked Sep 25, 2019 by meena.clay6

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The ratio of the volume of a tetragonal lattice unit cell to that of a hexagonal lattice unit cell is (both having same respectively lengths)

asked Sep 25, 2019 by meena.clay6

1 answer