Recent questions tagged medium

An L.P.G Cylinder contains 15kg of butane gas at $27^{\large\circ}C$ and 10 atm pressure. It was leaking and its pressure fell down to 8 atm pressure after one day. Calculate the amount of leaked gas.

asked Feb 23, 2014 by sharmaaparna1

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A square loop of side $a$ carrying a current $i_1$ is kept at a distance of $a$ from an infinite wire carrying a current $i_2$ as shown. The torque on the loop is

asked Feb 23, 2014 by thanvigandhi_1

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Density of a gas is found to be $5.46g/dm^3$ at $27^{\large\circ}C$ at 2 bar pressure. What will be its density at STP?

asked Feb 23, 2014 by sharmaaparna1

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A particle of specific charge (charge/mass) α starts moving from the origin under the action of an electric field $E_0 \hat i$ and a magnetic field $B_0 \hat k$ . Its velocity at $(x_0, 0, 0)$ is $4 \hat i + 3 \hat j$. The value of $ x_0$ is

asked Feb 23, 2014 by thanvigandhi_1

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A current carrying wire $PQ$ is placed $ \perp$ to another wire $RS$ carrying a constant current. If the second wire is free to move, it will have

asked Feb 23, 2014 by thanvigandhi_1

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What is observed during isothermal expansion of an ideal gas?

asked Feb 23, 2014 by mosymeow_1

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A 40 mL of a mixture of $H_2O$ and $O_2$ was placed in a gas burette at $18^{\large\circ}C$ and 1 atm P. A spark was applied so that the form a pure gas had a volume of 10mL at $18^{\large\circ}C$ and 1 atm P . If the remaining gas was $H_2$, what was the initial mole $\%$ of $H_2$ in mixture?

asked Feb 23, 2014 by sharmaaparna1

1 answer

Calculate the percentage of free volume available in 1 mole gaseous water at 1.0atm and $100^{\large\circ}C$. Density of liquid $H_2O$ at $100^{\large\circ}C$ is 0.958 g/mL.

asked Feb 23, 2014 by sharmaaparna1

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Sum of first $p,q\:\:and\:\:r\:terms$ of an $A.P.$ are $a,b\:\:and\:\:c$ respectively. Prove that $\large\frac{a}{p}$$(q-r)+\large\frac{b}{q}$$(r-p)+\large\frac{c}{r}$$(p-q)=0$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

A metallic wire is folded to form a square loop of side $a$. It carries a current $i$ and is kept $ \perp$ to a uniform magnetic field. If the shape of the loop is changed from a square to a circle without changing its length or current, the amount of work done is

asked Feb 23, 2014 by thanvigandhi_1

1 answer

Velocity and acceleration vector of a charged particle moving in a magnetic field at some instant are $ \overrightarrow V = 3\hat i + 4\hat j\: and\: \overrightarrow B= 2\hat i + x \hat j$. Select the incorrect alternative

asked Feb 23, 2014 by thanvigandhi_1

1 answer

The binding energy of $\;_{17}cl^{35}\;$ nucleus is 298 HeV . Find its atomic mass $\;(_{1}H^{1})\;$ is 1.008143 a.m.u and that of a neutron is 1.008986 a.m.u . Given $\;1amu=931 MeV\;$

asked Feb 23, 2014 by yamini.v

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A rigid circular loop of radius $ r$ lies in the $x-y$ plane on a flat table and a current $i$ flows through it. At this place, the earth’s magnetic field is $B_x\hat i + B_z \hat k$ . The value of $i$ so that one end of the loop lifts up from the table is

asked Feb 23, 2014 by thanvigandhi_1

1 answer

A conducting rod of mass $m$ and length $L$ is moving down a smooth incline plane on inclination $ \theta$ with constant velocity $ v$. A current $i$ is flowing in the conductor in a direction perpendicular to the paper inwards. A vertically upward magnetic field $ \overrightarrow B$ exists in space. Its magnitude is

asked Feb 23, 2014 by thanvigandhi_1

1 answer

Light described at a place by the equation $\;\varepsilon=(100 V/m)\;[sin(5\times10^{15} s^{-1})t+sin(8 \times10^{15})t]\;$ falls on a metal surface having work function 2eV . Than maximum kinetic energy of photo electrons will be :

asked Feb 22, 2014 by yamini.v

1 answer

The magnetic field at the centre of an equilateral triangular loop of side $2L$ carrying a current $i$ is

asked Feb 22, 2014 by thanvigandhi_1

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Same current is flowing in three infinitely long wires along positive $x, y$ and $z$ directions. The magnetic field at the point $(0, 0, -a)$ would be

asked Feb 22, 2014 by thanvigandhi_1

1 answer

The sum of $n$ terms of two $A.P.s$ are in the ratio $5n+4:9n+6$ Find the ratio of their $18^{th}$ terms.

asked Feb 22, 2014 by rvidyagovindarajan_1

1 answer

The force experienced by a pole of strength $100\: A-m$ at a distance of $0.2 \: m$ from a short magnet of length $10\: cm$ and pole strength $100\: A-m$ on its axial line will be

asked Feb 22, 2014 by thanvigandhi_1

1 answer

A uniform magnetic field exists in a region which forms an equilateral triangle of side $a$. The field is perpendicular to the plane of the triangle. A charge $q$ enters the triangle with speed $v$ along the $ \perp$ bisector of one of the sides and comes out along the $\perp$ bisector of the other side. Intensity of the magnetic field is

asked Feb 22, 2014 by thanvigandhi_1

1 answer

Which of the following have asymmetric carbon atom ?

asked Feb 22, 2014 by meena.p

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The order of reactivitiesof the following alkyl halides for a $Sn^2$ reaction is

asked Feb 22, 2014 by meena.p

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The bond between carbon atom (1) and carbon atom (2) in compound $N \equiv C_{(1)} -CH_{(2)}H \equiv CH_2$ involves the hybrid as

asked Feb 22, 2014 by meena.p

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The $Cl-C-Cl$ angle in $1,1,2,2$- tetracholoroethene and tetrachloromethane respectively will be about

asked Feb 22, 2014 by meena.p

1 answer

A photocell is operating in saturation mode with a aphotocurrent 4.8mA when a monochromatic radiation of wavelength $\;3000A^{0}\;$ and power 1mW is incident. When another monochromatic radiation of wavelength $\;1650A^{0}\;$ and power 5mW is incident , it is observed that maximum velocity of photoelectron generation per incident to be same for both cases . Than the threshold wavelength for cell is :

asked Feb 22, 2014 by yamini.v

1 answer

A small potassium foil is placed (perpendicular to direction of incidence of light ) a distance r (=0.5 m) from a point light source whose output power $\;P_{0}\;$ is 1W . Assuming wave nature of light . how long would it take for foil to soak up enough energy (=1.8eV) from the beam to eject on electron ? (Assume that ejected photoelectron collected its energy from a circular area of foil whose radius equals radius of potassium atom ($\;1.3\times10^{-10}m$))

asked Feb 22, 2014 by yamini.v

1 answer

A beam of light consists of 4 wavelength $\;4000A^{0},4800A^{0},6000A^{0}\; and\;7000A^{0}\;,$ each of intensity $\;1.5\times10^{-3}Wm^{-2}\;.$The beam falls normally on an area $\;10^{-4} m^2\;$ of a clean metallic surface of work function 1.9eV . Assuming no loss of light energy the no.of photoelectrons liberated per second is

asked Feb 22, 2014 by yamini.v

1 answer

In an experiment on photo electric emission , following observations were made ; (1) Wavelength of incident light = $\;1.98\times10^{-7}m\;$ 2 Stopping potential = $\;2.5 volt\;$. Then kinetic energy of photoelectrons with maximum speed and Thus hold frequency are respectively

asked Feb 22, 2014 by yamini.v

1 answer

A small particle of mass m moves in such a way that the potential energy $\;u=ar^2\;$ where a is a constant and r is the distance of particle from origin. Assuming Bohr's model of quantization of angular momentum and circular orbits. Then the radium of $\;n^{th}\;$ allowed orbit is

asked Feb 22, 2014 by yamini.v

1 answer

Which of the following hydrocarbons has the lowest dipole moment?

asked Feb 21, 2014 by meena.p

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Electrons of energies 12.09 eV can cause radiation to be emitted from hydrogen atom. calculate the principal quantum number of the orbit to which the electron in the hydrogen atom is raised and the wavelength of radiation emitted if it drops back to the ground state .

asked Feb 21, 2014 by yamini.v

1 answer

The products of combustion of an aliphatic thiol (RSH) at 298 k are

asked Feb 21, 2014 by meena.p

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The hybridisation of carbon atoms in $C-C$ single bond of $HC \equiv C-CH = CH_2$ is

asked Feb 21, 2014 by meena.p

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The number of sigma and pi-bonds in 1-butene -3-yne are

asked Feb 21, 2014 by meena.p

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If a current carrying coil having a magnetic moment $ \overrightarrow M$ is placed in a magnetic field $ \overrightarrow B$ , then the torque acting on it will be

asked Feb 21, 2014 by thanvigandhi_1

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The IUPAC name of $C_6H_5COCl$ is

asked Feb 21, 2014 by meena.p

1 answer

The IUPAC name of the following compound

asked Feb 21, 2014 by meena.p

1 answer

Which is a product X of reaction?

asked Feb 21, 2014 by sreemathi.v

1 answer

Calculate the average volume available to a molecule in a sample of nitrogen gas at STP. What is the average distance between neighbouring molecules if nitrogen molecules are spherical in nature?

asked Feb 21, 2014 by sharmaaparna1

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The average speed of an ideal gas molecule at $27^{\large\circ}C$ is 0.3 m/s. Calculate the average speed at $927^{\large\circ}C$

asked Feb 21, 2014 by sharmaaparna1

1 answer

A vertical hollow cylinder of height 1.52m is fitted with a movable piston of negligible mass and thickness. The lower half of the cylinder contains an ideal gas and the upper half is filled with mercury. The cylinder is initially at 300K. When the temperature is raised half of the mercury comes out of the cylinder . Find the temperature assuming the thermal expansion of mercury to be negligible.

asked Feb 21, 2014 by sharmaaparna1

1 answer

The appropriate reagents for the following transformation:

asked Feb 21, 2014 by sreemathi.v

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In the below reaction what is A?

asked Feb 21, 2014 by sreemathi.v

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Which of the following compounds form two isomeric oximes on reacting with $NH_2OH$

asked Feb 21, 2014 by sreemathi.v

1 answer

Among the following compounds, the strongest acid is

asked Feb 21, 2014 by meena.p

1 answer

What is the major organic product obtained from the following reaction?

asked Feb 21, 2014 by sreemathi.v

1 answer

In the below reaction the product of A is

asked Feb 21, 2014 by sreemathi.v

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What is the product of the following series of reactions?

asked Feb 21, 2014 by sreemathi.v

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A paramagnetic substance is kept in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

asked Feb 21, 2014 by thanvigandhi_1

1 answer

Which of the following acids has the smallest dissociation constant

asked Feb 21, 2014 by meena.p

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