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Recent questions tagged q21
Questions
Among the following molecules,the shortest bond length is to be found in
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q21
easy
asked
Mar 5, 2014
by
sreemathi.v
1
answer
Find the four numbers forming a G.P. in which the $3^{rd}$ term is greater than the $1^{st}$ term by $9$ and the $2^{nd}$ term is greater than the $4^{th}$ term by $18$.
cbse
class11
ch9
bookproblem
exercise9-3
medium
sec-b
q21
math
sequences-and-series
asked
Mar 1, 2014
by
rvidyagovindarajan_1
1
answer
Which of the following reactions can be used to prepare the below one
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q21
medium
asked
Feb 28, 2014
by
sreemathi.v
1
answer
Statement - 1: Aryl halides undergo nucleophilic substitution with ease. Statement - 2: The carbon - halogen bond in aryl halides has partial double bond character.
jeemain
chemistry
class11
organic-chemistry
q21
difficult
basic-organic-chemistry
ch12
asked
Feb 21, 2014
by
meena.p
1
answer
The product of below reaction:
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q21
easy
asked
Feb 19, 2014
by
sreemathi.v
1
answer
When the temperature is increased surface tension of water
jeemain
chemistry
physical-chemistry
class11
states-of-matter
liquid-state
easy
q21
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
$A(1,2)$ & $B(7,6)$ are the two opposite points of straight line (i.e) these two points are on opposite side of a straight line then find a equation of straight line which is equidistant from these two points and also AB is perpendicular to the straight line.
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q21
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Solution of the general equation : $\large\frac{dy}{dx}$$=\cos (x+y) - \sin (x+y) $
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q21
difficult
asked
Feb 3, 2014
by
meena.p
1
answer
$K_4[Fe(CN)_6]$ is a
jeemain
chemistry
class12
coordination-compounds
unit9
q21
easy
asked
Jan 31, 2014
by
sreemathi.v
1
answer
In the given circuit, potential barriers developed across diode is $0.5 v$ . Find the current in the circuit.
jeemain
physics
class12
unit19
ch14
q21
medium
asked
Jan 27, 2014
by
meena.p
1
answer
Which of the following fumes in moist air?
jeemain
chemistry
class11
s-block-elements
unit10
q21
easy
asked
Jan 27, 2014
by
sreemathi.v
1
answer
If p, q, r are simple propositions with truth values T,F,T then the truth value of $ [(^{\sim}p Vq) \wedge ^{\sim}r] \Rightarrow p$ is
jeemain
math
mathematical-reasoning
class11
ch14
difficult
implications-(tautology-contradiction.)
q21
asked
Jan 23, 2014
by
thanvigandhi_1
1
answer
Permanent hardness of water cannot be completely removed by
jeemain
chemistry
class11
hydrogen
unit9
q21
easy
asked
Jan 23, 2014
by
sreemathi.v
1
answer
Which statement represents the inverse of the statement "If it is snowing, then Skeeter wears a sweater."?
jeemain
math
mathematical-reasoning
class11
unit14
medium
implications-(tautology-contradiction.)
q21
asked
Jan 20, 2014
by
thanvigandhi_1
1
answer
The greatest affinity for haemoglobin is shown by
jeemain
chemistry
class11
environmental-chemistry
unit14
q21
easy
asked
Jan 20, 2014
by
sreemathi.v
1
answer
Which is true?
jeemain
math
mathematical-reasoning
class11
ch14
easy
statements
q21
asked
Jan 17, 2014
by
thanvigandhi_1
1
answer
If $P(A)=\large\frac{1}{12}\: P(B)=\large\frac{5}{12}\: and \: P(B/A) = \large\frac{1}{15}$ then $P(A \cup B )$ is equal to
jeemain
math
cbse
class12
probability
difficult
q21
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
A man is known to speak truth 3 out of 4 times. He throws a die and reports that it is 6. The probability that it is actually a 6 is
jeemain
math
cbse
class12
probability
medium
q21
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
Photoelectric effect shows :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
atomic- models-(rutherford-and-thomson)
q21
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
A piece of Al weighing $2.7g$ is titrated with $75\;ml$ of $H_2SO_4$ (specific gravity = $1.18gmL^{-1}$ and $24.7%$ $H_2SO_4$ by weight). After the metal is completely dissolved, the solution is diluted to $400\;ml$. Calculate molarity of free $H_2SO_4$ in solution.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q21
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
Three identical dice are rolled. The probability that the same number will appear on each of them is
jeemain
math
cbse
class12
probability
events
easy
q21
asked
Jan 3, 2014
by
thanvigandhi_1
1
answer
Find n such that is $\large\frac{512}{729}\;$is the nth term of the GP 18,-12,8,-----------------
jeemain
math
class11
ch9
sequences-and-series
easy
geometric-progression
q21
asked
Jan 1, 2014
by
yamini.v
1
answer
If the lines $x=1+s,\:y=3-\lambda s,\:z=1+\lambda s\:\:and\:\:x=\large\frac{t}{2}$, $y=1+t,\:z=2-t$ where $s\:\:and\:\:t$ are parameters, are $coplanar$, then $\lambda=?$
jeemain
math
class12
ch11
3d-geometry
coplanar-lines
easy
q21
asked
Dec 28, 2013
by
rvidyagovindarajan_1
1
answer
If $f(x+y)=f(x).f(y) \forall x,y$ and $f(5)=2,f'(0)=3$ then $f'(5)$ is
jeemain
math
class11
ch13
limits-and-derivatives
introduction to limits
easy
q21
asked
Dec 23, 2013
by
sreemathi.v
1
answer
The velocity of electromagnetic radiation in a medium of permittivity $ \in_0$ and permeability $ \mu_0$ is given by :
aipmt
modelpaper
physics
2008
q21
asked
Dec 15, 2013
by
thanvigandhi_1
2
answers
Integrate : $\int \limits_0^{\large\frac{\pi}{2}} \large\frac{\cos ^3 x}{\sin ^3 x + \cos ^3 x }$$ dx$
jeemain
math
class12
ch7
integral-calculus
integration-using-partial-fractions
medium
q21
asked
Dec 13, 2013
by
meena.p
1
answer
$E^o\large\frac{A^{+3}}{A^+}$$=xV,E^o\large\frac{A^{+3}}{A^{+2}}$$=yV,E\large\frac{A^{+2}}{A^+}=$?
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q21
easy
asked
Dec 11, 2013
by
sreemathi.v
1
answer
The structure of $IF_7$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q21
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
An abnormal increase in the cell number due to the infection is called :
jeemain
eamcet
biology
2002
q21
asked
Dec 8, 2013
by
thanvigandhi_1
0
answers
Refer to the below reaction:
jeemain
chemistry
unit21
organic-chemistry
q21
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 5, 2013
by
sreemathi.v
1
answer
Which orders are correct regarding melting point?
jeemain
chemistry
unit21
organic-chemistry
q21
medium
basic-organic-chemistry
class11
ch12
asked
Dec 3, 2013
by
sreemathi.v
1
answer
Who introduced the term 'Heterosis' ?
jeemain
eamcet
biology
2001
q21
asked
Dec 1, 2013
by
thanvigandhi_1
0
answers
Industrially chlorine is prepared
jeemain
chemistry
unit15
p-block-elements
q21
easy
asked
Nov 27, 2013
by
sreemathi.v
1
answer
If the system of equations $ax+y+z=0$, $x+by+z=0$, $x+y+cz=0$, where $(a,b,c\neq 1)$ has a non-trivial solutions, then the value of $\large\frac{1}{1-a}+\frac{1}{1-b}+\frac{1}{1-c}$ is
jeemain
math
class12
ch4
determinants
q21
system-of-linear-equations
difficult
asked
Nov 26, 2013
by
sreemathi.v
1
answer
Oxidative Phosphorilation occurs in :
jeemain
eamcet
biology
2000
q21
asked
Nov 24, 2013
by
thanvigandhi_1
0
answers
The inflorescence in case of Yucca belonging to Liliaceae is
jeemain
eamcet
biology
1999
q21
asked
Nov 22, 2013
by
thanvigandhi_1
0
answers
If $\begin{vmatrix}x^n&x^{n+2}&x^{n+3}\\y^n&y^{n+2}&y^{n+3}\\z^n&z^{n+2}&z^{n+3}\end{vmatrix}$ = $(y-z)(z-x)(x-y)(\large\frac{1}{x}+\frac{1}{y}+\frac{1}{z})$ then $n$ is equal to
jeemain
math
class12
ch4
determinants
q21
evaluate-determinants
medium
asked
Nov 22, 2013
by
sreemathi.v
1
answer
If $A=\begin{bmatrix}\alpha&2\\2&\alpha\end{bmatrix}$ and $\mid A^3\mid=125$ then the value of $\alpha$ is
jeemain
math
ch4
class12
determinants
q21
minors-and-cofactors
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
The wavelengths of two notes in air are $\large\frac{36}{195}$$m$ and $\large\frac{36}{193}$$m$. Each note produces 10 beats per second separately with a third note of fixed frequency.The velocity of sound in air in m/s is :
jeemain
eamcet
physics
2004
q21
asked
Nov 20, 2013
by
meena.p
1
answer
We know that equilibrium constant, K changes with temperature. At 300K, equilibrium constant is 25 and at 400K it is 10. Hence, backward reaction will have energy of activation:
jeemain
aipmt
chemistry
equilibrium
difficult
q21
biology
asked
Nov 15, 2013
by
mosymeow_1
1
answer
If $\alpha_1, \alpha_2, \alpha_3$ respectively denote the moduli of the complex number $-i, \large\frac{1}{3} $$ (1+i)$ and $-1+i$, then their increasing order is :
jeemain
eamcet
math
2005
q21
asked
Nov 11, 2013
by
meena.p
1
answer
How many zygospores are formed in a 100 - celled filament of spirogyra affinis if all cells are involved in conjugation ?
jeemain
eamcet
biology
2010
q21
asked
Nov 11, 2013
by
thanvigandhi_1
1
answer
A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4 . The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm) of B in the mixture ?
jeemain
eamcet
chemistry
2005
q21
asked
Nov 8, 2013
by
meena.p
0
answers
A vehicle sounding a whistle of frequency 256 Hz is moving on a straight road, towards a hill with a velocity of $10\;ms^{-1}$. The number of beats per second observed by a person travelling in the vehicle is : (Velocity of sound=330 \;ms^{-1})
jeemain
eamcet
physics
2005
q21
asked
Nov 7, 2013
by
meena.p
1
answer
The equation of the locus of z such that $\bigg|\large\frac{z-i}{z+i} \bigg|$$=2$ Where $z=x+iy$ is a complex number, is
jeemain
eamcet
math
2006
q21
asked
Nov 5, 2013
by
meena.p
1
answer
If $\overrightarrow a=\hat i-\hat j+2\hat k, \:\:\overrightarrow b=2\hat i+4\hat j+\hat k\:\:and\:\:\overrightarrow c=\lambda \hat i+\hat j+\mu k$ are mutually $\perp$ then $(\lambda,\mu)=?$
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q21
asked
Nov 5, 2013
by
rvidyagovindarajan_1
1
answer
$Mg(OH)_2$ in the form of milk of magnesia is used to neutralize excess stomach acid .How many moles of stomach acid can be neutralized by 1g of $Mg(OH)_2$? (Molar mass of $Mg(OH)_2=58.33)$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q21
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
Which of the following is added to chloroform to slow down its aerial oxidation in presence of light?
jeemain
eamcet
chemistry
2006
q21
asked
Oct 30, 2013
by
meena.p
1
answer
Two string A and b of lengths, $L_a=80\;cm$ and $L_B=x\;cm$ respectively are used separately in a sonometer. The ratio of their densities $(d_A/d_B)$ is $0.81$ The diameter of B is one -half that of A. If the string have the same tension and fundamental frequency the value of x is :
jeemain
eamcet
physics
2006
q21
asked
Oct 29, 2013
by
meena.p
1
answer
In a hydrophyte, the submerged leaves compensate for the roots. That plant belongs to the category of
jeemain
eamcet
biology
2011
q21
asked
Oct 26, 2013
by
thanvigandhi_1
1
answer
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