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Vinyl cyclopropane on reaction with HBr yields which of the following as major product
jeemain
chemistry
unit21
organic-chemistry
q1
medium
basic-organic-chemistry
class11
ch12
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 ?
jeemain
math
class12
ch13
vector-algebra
medium
q71
asked
Dec 1, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=\hat i+\hat j+\hat k,\:\overrightarrow b=\hat i\:\:and\:\:\overrightarrow c=x\hat i-\hat j+\hat k$, then the value of $x$ for which $\overrightarrow a\:\overrightarrow b\:and\:\overrightarrow c$ are coplanar is ?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q70
asked
Dec 1, 2013
by
rvidyagovindarajan_1
1
answer
The term independent of $x$ in the expansion $\bigg(\large\frac{x+1}{x^{\large\frac{2}{3}}-x^{\large\frac{1}{3}}+1}-\frac{x-1}{x-\sqrt x}\bigg)^{10}$ is ?
jeemain
math
class11
ch8
binomial-theorem
general-and-middle-terms
difficult
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 $|\overrightarrow a+\overrightarrow b+\overrightarrow c|=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q69
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 ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q68
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 ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q67
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a= x^2\hat i+2\hat j-2\hat k,\:\overrightarrow b=\hat i-\hat j+\hat k\;and\:\overrightarrow c=x^2\hat i+5\hat j-4\hat k$ are three vectors, then the values of $x$ for which the angle between $\overrightarrow a\:and\:\overrightarrow b$ is acute and that between $\overrightarrow b\:and\:\overrightarrow c$ is obtuse is ?
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q66
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b\:and\:\overrightarrow c$ are non coplanar vectors and if $\overrightarrow a'=\large\frac{\overrightarrow b\times \overrightarrow c}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},\:\overrightarrow b'=\large\frac{\overrightarrow c\times \overrightarrow a}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},\:and \:\overrightarrow c'=\large\frac{\overrightarrow a\times \overrightarrow b}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},$ then $\overrightarrow a.\overrightarrow a'+\overrightarrow b.\overrightarrow b'+\overrightarrow c.\overrightarrow c'=?$
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q65
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.
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
For any vector $\overrightarrow a\:\:and\:\:\overrightarrow b$ the angle between $|\overrightarrow a|\overrightarrow b+|\overrightarrow b|\overrightarrow a$ and $|\overrightarrow a|\overrightarrow b-|\overrightarrow b|\overrightarrow a$ is ?
jeemain
math
class12
vector-algebra
ch10
easy
vector-product
q64
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
A uniform circular disc of radius r is placed on a rough horizontal surface and given a linear $w_0$ as shown. The disc com,es to rest after moving some distance to the right. It follows that
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
difficult
asked
Nov 29, 2013
by
meena.p
2
answers
A solid sphere is placed rotating with its center initially at rest in a corner as shown. (a) and (b) . Coefficient of friction between all surfaces and sphere is $\large\frac{1}{3}$ Find the ratio of friction forces $\large\frac{fa}{fb}$ by ground in situations (a) and (b)
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
difficult
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
2
answers
If the vectors $p\hat i+\hat j+\hat k,\:\hat i+q\hat j+\hat k,\: \:and\:\:\hat i+\hat j+r\hat k$ $(p\neq q\neq r\neq 1)$ are three coplanar vectors then the value of $pqr-(p+q+r)=?$
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q63
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
As shown in the figure , auniform disc of mass m is rolling without slipping with an angular velocity w. The portion AB is rough and BC is smooth. When it crosses the point B disc will be in
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
easy
asked
Nov 29, 2013
by
meena.p
1
answer
Silica is eliminated during the process as:
jeemain
chemistry
unit15
p-block-elements
q96
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
$\Rightarrow A\overset{HBr}{\rightarrow}C_2H_5Br\overset{B}{\rightarrow}A$.B is
jeemain
chemistry
unit15
p-block-elements
q95
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
$\Rightarrow A\overset{HBr}{\rightarrow}C_2H_5Br\overset{B}{\rightarrow}A$.A is
jeemain
chemistry
unit15
p-block-elements
q94
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Flurosis disease is caused due to the reaction of __________with excess of fluride in the body
jeemain
chemistry
unit15
p-block-elements
q93
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
In the ground state an element has 13 electrons in M shell.The element is
jeemain
chemistry
unit15
p-block-elements
sec-a
q92
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
The number of lone pairs of e's present in $Xe$ in $XeF_4$
jeemain
chemistry
unit15
p-block-elements
q91
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Chloroethane reacts with $X$ to form diethyl Either.What is $X$?
jeemain
chemistry
unit15
p-block-elements
q90
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Which of the following is Lucus reagent?
jeemain
chemistry
unit15
p-block-elements
q89
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
In which of the following $H_2O_2$ acts as reducing agent?
jeemain
chemistry
unit15
p-block-elements
q88
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Which of the following is used in the preparation of generated water (soda)?
jeemain
chemistry
unit15
p-block-elements
sec-a
q87
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Which of the following is anhydride of $HNO_3$?
jeemain
chemistry
unit15
p-block-elements
q86
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Which of the following in oxide mineral
jeemain
chemistry
unit15
p-block-elements
q85
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Mortar is mixture of
jeemain
chemistry
unit15
p-block-elements
q84
sec-a
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
A gas decolourises $Br_2$ in $CCl_4$ and forms a precipitate with Ammoniacal silver nitrate .The gas is
jeemain
chemistry
unit15
p-block-elements
q83
difficult
asked
Nov 29, 2013
by
sreemathi.v
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
A uniform disc is performing pure rolling on a smooth stationary surface with constant angular velocity. At any instant, for the lower most point of the disc
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
easy
asked
Nov 29, 2013
by
meena.p
1
answer
Carbogen is _____________
jeemain
chemistry
unit15
p-block-elements
q82
difficult
asked
Nov 29, 2013
by
sreemathi.v
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
If a spherical ball rolls with out slipping, the fraction of its total energy associated with rotation is
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
easy
asked
Nov 29, 2013
by
meena.p
1
answer
The oxidation number of sulphur in $S_8$
jeemain
chemistry
unit15
p-block-elements
q81
difficult
asked
Nov 29, 2013
by
sreemathi.v
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
$2D_2O\overset{electrolysis}{\rightarrow}$
jeemain
chemistry
unit15
p-block-elements
q80
difficult
asked
Nov 29, 2013
by
sreemathi.v
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,
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
$Mg_3N_2+6D_2O\rightarrow x$
jeemain
chemistry
unit15
p-block-elements
q79
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
$CaO+D_2O\rightarrow Ca(OD)_2\downarrow$
jeemain
chemistry
unit15
p-block-elements
q78
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Water gas has
jeemain
chemistry
unit15
p-block-elements
q77
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
The empirical formulae for zeolites
jeemain
chemistry
unit15
p-block-elements
q76
sec-a
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
Orthosilicates have
jeemain
chemistry
unit15
p-block-elements
q75
difficult
asked
Nov 29, 2013
by
sreemathi.v
1
answer
$2R-Cl+Si\overset{Cu/300^{\large\circ}C}{\rightarrow}Organosilicon$
jeemain
chemistry
unit15
p-block-elements
q74
difficult
asked
Nov 29, 2013
by
sreemathi.v
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.
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
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
jeemain
physics
class11
unit5
rotational-motion
translation-and-rotation
medium
asked
Nov 29, 2013
by
meena.p
1
answer
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