Recent questions tagged medium

There are three common ways to convert an alkene into alcohol: a) acid catalysed hydration, b)hydroboration -oxidation and c)oxymercuration-demercuration. Which of the following statements about these reactions is correct?

asked Dec 2, 2013 by sreemathi.v

1 answer

Consider the following reaction

asked Dec 2, 2013 by sreemathi.v

1 answer

1-Methyl cyclopentene can be

asked Dec 2, 2013 by sreemathi.v

1 answer

Arrange in decreasing order of reactivity with HCl

asked Dec 2, 2013 by sreemathi.v

1 answer

Refer to the below equation:

asked Dec 2, 2013 by sreemathi.v

1 answer

Which order are correct regarding the melting point?

asked Dec 2, 2013 by sreemathi.v

1 answer

Arrange the following alkenes in the increasing order of their heats of hydrogenation: 1.2-methyl butene,2.cis -2pentene,3.3-methyl butene

asked Dec 2, 2013 by sreemathi.v

1 answer

Vinyl cyclopropane on reaction with HBr yields which of the following as major product

asked Dec 2, 2013 by sreemathi.v

1 answer

If $\overrightarrow {AB}=3\hat i+\hat j-2\hat k,\:and \:\overrightarrow {AC}=-\hat i+3\hat j+4\hat k$ are two sides af the $\Delta ABC$, then the length of the median through $A$ is ?

asked Dec 1, 2013 by rvidyagovindarajan_1

1 answer

If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are three vectors of magnitude $3,4,5$ respectively. If each vector is $\perp$ to sum of the other two vectors then $|\overrightarrow a+\overrightarrow b+\overrightarrow c|=?$

asked Nov 30, 2013 by rvidyagovindarajan_1

1 answer

If the sum of two unit vectors is a unit vector, then the magnitude of their difference is ?

asked Nov 30, 2013 by rvidyagovindarajan_1

1 answer

If $ |\overrightarrow a+\overrightarrow b|=|\overrightarrow a|$, then the angle between $2\overrightarrow a+\overrightarrow b$ and $\overrightarrow b$ is ?

asked Nov 29, 2013 by rvidyagovindarajan_1

1 answer

A small spherical ball is released from a point at a height h on a rough track. Assuming that it does not slip any where , find its linear speed when it rolls on the horizontal part of the track.

asked Nov 29, 2013 by meena.p

1 answer

A small object density rolls up a curved surface with an initial velocity V. It reaches up to a maximum height of $ \large\frac{3V^2}{4g}$ with respect to the initial position. The object is

asked Nov 29, 2013 by meena.p

1 answer

A solid sphere of mass m is lying at rest on a rough horizontal surface. The coefficient of friction between the ground and sphere is $\mu$. The maximum value of F, so that the sphere will not slip is equal to

asked Nov 29, 2013 by meena.p

2 answers

A ring, cylinder and solid sphere are placed on the top of a rough incline on which the sphere can just roll with out slipping. When all of them are released at the same instant from the same position, then

asked Nov 29, 2013 by meena.p

1 answer

A hollow smooth uniform sphere A of mass 'm' roll without sliding on a smooth horizontal surface. It collides elastically and head on with another stationary solid sphere B of the same mass m and same radius. The ratio of kinetic energy of 'B' to that of 'A' just after the collision is

asked Nov 29, 2013 by meena.p

1 answer

A body of mass m and radius r is rotated with angular velocity w as shown. and then kept on a surface that has sufficient friction. then the body will move

asked Nov 29, 2013 by meena.p

1 answer

An object of mass M and Radius R is performing pure rolling. motion on smooth horizontal surface under the action of a constant force F. The object may be

asked Nov 29, 2013 by meena.p

1 answer

A yo-yo placed on a rough horizontal surface and a constant force F, less than its weight , pulls it vertically . Due to this

asked Nov 29, 2013 by meena.p

1 answer

A disc of radius R rolls on a horizontal ground with linear acceleration $'a'$ and angular acceleration $' \alpha '$ as shown. The magnitude of the acceleration $'\alpha'$ of point P at an instant , when its linear velocity is V and angular velocity is $w$ will be,

asked Nov 29, 2013 by meena.p

1 answer

Which of the following statement(s) is /are correct for a spherical body rolling with out slipping on a rough horizontal ground at rest.

asked Nov 29, 2013 by meena.p

1 answer

A disc is pulled by a force F acting at a point above the centre of mass of the disc. The direction of frictional force f acting on the disc pushed on a rough surface will be represented by

asked Nov 29, 2013 by meena.p

1 answer

In a GP, given that the first term is $ 312 ½ $ and the common ratio is $ 1/2 $ find the sum of the terms of the series to infinity.

asked Nov 28, 2013 by harini.tutor

1 answer

The value of $a$ for which the volume of the parallelopiped formed by the vectors $\hat i+a\hat j+\hat k,\:\:\hat j+a\hat k,\:\:a\hat i+\hat k$ is minimum is ?

asked Nov 28, 2013 by rvidyagovindarajan_1

1 answer

If $\overrightarrow u=\hat i+\hat j,\:\overrightarrow v=\hat i-\hat j\:\:and\:\:\overrightarrow w=\hat i+2\hat j+3\hat k$. and if $\hat n$ is a unit vector such that $\overrightarrow u.\hat n=\overrightarrow v.\hat n=0$, then $|\overrightarrow w.\hat n|=?$

asked Nov 28, 2013 by rvidyagovindarajan_1

1 answer

If the resultant of all external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that

asked Nov 28, 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

In the given figure , a ball strikes a rod elastically and the rod is hinged at point A. Then which of the statements is / are correct ?

asked Nov 28, 2013 by meena.p

1 answer

A boy sitting over a rotating stool has his arms folded. If he stretches his arms, his angular momentum about the axis of rotation

asked Nov 28, 2013 by meena.p

1 answer