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Recent questions tagged q19
Questions
A thin convex lens made from crown glass $\bigg(\mu=\large\frac{3}{2}\bigg)$ has focal length $f.$When it is measured in two different liquids having refractive indices $\large\frac{4}{3}$ and $\large\frac{5}{3}$, it has the focal lengths $f_1$ and $f_2$ respectively. The correct relation between the focal lengths is
jeemain
jeemain-2014
physics
q19
medium
asked
Apr 7, 2014
by
meena.p
1
answer
Evaluate the given limit $ \lim\limits_{x \to 0} x\sec x$
math
cbse
class11
ch13
limits-and-derivatives
bookproblem
limits
exercise13-1
p301-303
q19
asked
Apr 4, 2014
by
thanvigandhi_1
1
answer
Find the equation of an ellipse that satisfies the following conditions: Centre at $(0,0)$, major axis on y-axis and passes through $(3,2), \; (1,6)$
cl35719
cl35707
cl35701
cl35314
cl35310
cl35306
cl35304
math
cbse
class11
ch11
exercise11-3
conic-sections
ellipse
q19
easy
sec-b
asked
Apr 3, 2014
by
balaji.thirumalai
1
answer
The ratio of A.M. and G.M. of two positive numbers $a$ and $b$ is $m:n$. Show that $a:b=(m+\sqrt {m^2-n^2}):(m-\sqrt {m^2-n^2})$
cbse
class11
ch9
bookproblem
misc
difficult
sec-c
q19
math
sequences-and-series
asked
Mar 31, 2014
by
rvidyagovindarajan_1
1
answer
The non proteinous substances which certain enzymes require for their activity are called
jeemain
aipmt
chemistry
biomolecules
organic-chemistry
cbse
class12
unit16
easy
q19
asked
Mar 27, 2014
by
thanvigandhi_1
1
answer
In this sequence Z is
jeemain
aipmt
chemistry
nitrogen
organic-chemistry
cbse
class12
unit13
q19
medium
asked
Mar 21, 2014
by
thanvigandhi_1
1
answer
Find the distance between the two lines $l_1$ and $l_2$ where $l_1: \overrightarrow r=(\hat i+2\hat j-4\hat k)+\lambda(2\hat i+3\hat j+6\hat k)$ and $l_2: \overrightarrow r=(3\hat i+3\hat j-5\hat k)+\mu(4\hat i+6\hat j+12\hat k)$
cbse
class12
modelpaper-2014
65-2-3
sec-b
q19
math
asked
Mar 21, 2014
by
rvidyagovindarajan_1
1
answer
Granulated zinc is made by
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q19
medium
asked
Mar 17, 2014
by
meena.p
1
answer
A process is spontaneous at all temperatures, if
jeemain
physics
thermodynamics
cbse
class11
class12
q19
easy
asked
Mar 15, 2014
by
thanvigandhi_1
1
answer
C-C bond in $C_2H_6$ undergoes heterolytic fission,the hybridisation of carbon is/are
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q19
difficult
asked
Mar 10, 2014
by
sreemathi.v
1
answer
Which of the following is a natural fibre?
jeemain
aipmt
chemistry
cbse
unit5
class12
organic-chemistry
polymers
q19
easy
asked
Mar 6, 2014
by
thanvigandhi_1
1
answer
The hybridisation of $'Al'$ in $AlCl_4^-$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q19
easy
asked
Mar 4, 2014
by
sreemathi.v
1
answer
Find the sum of the products of the corresponding terms of the sequences $2,4,8,.......32$ and $128,32,8,......\large\frac{1}{2}$
cbse
class11
ch9
bookproblem
exercise9-3
sec-a
medium
q19
math
sequences-and-series
asked
Mar 1, 2014
by
rvidyagovindarajan_1
1
answer
Deep blue colour formed by addition of copper (II) sulphate solution to ethyl amine is due to formation of
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q19
easy
asked
Feb 28, 2014
by
sreemathi.v
1
answer
Electromagnetic waves are produced by:
jeemain
aipmt
physics
cbse
class12
ch8
electromagnetic-waves
q19
easy
asked
Feb 26, 2014
by
thanvigandhi_1
1
answer
Among the following compounds, the strongest acid is
jeemain
chemistry
class11
organic-chemistry
q19
medium
basic-organic-chemistry
ch12
asked
Feb 21, 2014
by
meena.p
1
answer
Which of the following statements are correct ?
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q19
easy
asked
Feb 19, 2014
by
sreemathi.v
1
answer
At $100^{\large\circ}C$ and 1 atm , if the density of liquid water is 1.0g $cm^{-3}$ and that of water vapour is $0.0006gcm^{-3}$ , then the volume occupied by water molecules in 1 litre of stream at that temperature is :
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q19
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
Find the equation of line parallel to $3x-4y+2=0$ and at a distance 2 from it?
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q19
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
$\large\frac{dy}{dx} =\large\frac{y+x+1}{y+x +5}$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q19
easy
asked
Feb 3, 2014
by
meena.p
1
answer
Neutral complex among following
jeemain
chemistry
class12
coordination-compounds
unit9
q19
easy
asked
Jan 31, 2014
by
sreemathi.v
1
answer
In LEDs one can see emitted light to because
jeemain
physics
class12
unit19
ch14
q19
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
The amphoteric alkaline earth metal oxide is
jeemain
chemistry
class11
s-block-elements
unit10
q19
easy
asked
Jan 27, 2014
by
sreemathi.v
1
answer
The contrapositive of $ (p V q) \Rightarrow r$ is
jeemain
math
mathematical-reasoning
class11
ch14
difficult
implications-(tautology-contradiction.)
q19
asked
Jan 23, 2014
by
thanvigandhi_1
1
answer
Among the hydrides given below which are reasonably good acids.
jeemain
chemistry
class11
hydrogen
unit9
q19
easy
asked
Jan 22, 2014
by
sreemathi.v
1
answer
The statement: 24 is divisible by 6 if 25 is a multiple of 5, in if-then form would be
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q19
asked
Jan 20, 2014
by
thanvigandhi_1
1
answer
The study of toxicity of organo metallic compound is termed as
jeemain
chemistry
class11
environmental-chemistry
unit14
q19
easy
asked
Jan 20, 2014
by
sreemathi.v
1
answer
What is the negation of the statement: 2 is the only even prime number?
jeemain
math
mathematical-reasoning
class11
ch14
easy
statements
q19
asked
Jan 17, 2014
by
thanvigandhi_1
1
answer
The chances to fail in Physics are 20% and the chances to fail in Mathematics are 10%. What are the chances to fail in at least one subject ?
jeemain
math
cbse
class12
probability
difficult
q19
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
Which of the following does not characterized X-rays?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
atomic- models-(rutherford-and-thomson)
q19
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
Ordinary dice are rolled. The probability that at least half of them will show at least 3 is
jeemain
math
cbse
class12
probability
bionomial-distribution
medium
q19
asked
Jan 9, 2014
by
thanvigandhi_1
1
answer
Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is :
jeemain
math
cbse
class12
probability
probability-distribution-of-a-random-variable
easy
q19
asked
Jan 3, 2014
by
thanvigandhi_1
1
answer
What are next two terms of the GP $\sqrt{2},\;1/\sqrt{2},\;1/2\sqrt{2}$
jeemain
math
class11
ch9
sequences-and-series
easy
geometric-progression
q19
asked
Jan 1, 2014
by
yamini.v
1
answer
$L$ is line of intersection of the planes $2x+3y+z=1\:\:and\:\:x+3y+2z=2$ and $\alpha$ is the angle made by the line $L$ with positive $x-axis$ then $cos\alpha=?$
jeemain
math
class12
ch11
3d-geometry
intersection-of-lines-and-planes
difficult
q19
asked
Dec 28, 2013
by
rvidyagovindarajan_1
1
answer
A proton, a deuteron and an alpha particle are accelerated through potentials of $V,\: 2V\: and\: 4V$ respectively. Their velocities will bear a ratio
jeemain
physics
dual-nature-matter-radiation
cbse
class12
medium
q19
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
$\lim\limits_{x\to 0}\large\frac{\log x^n-[x]}{[x]}$ $n\in N$ ($x$ denotes greatest integer less than or equal to $x$)
jeemain
math
class11
ch13
limits-and-derivatives
introduction to limits
easy
q19
asked
Dec 23, 2013
by
sreemathi.v
1
answer
A point performs simple harmonic oscillation of period T and the equation of motion is given by $ x = a\: \sin \: ( wt+ \pi/6)$. After the elapse of what fraction of the time period the velocity of the point will be equal to half of its maximum velocity ?
aipmt
modelpaper
physics
2008
q19
asked
Dec 15, 2013
by
thanvigandhi_1
0
answers
$y= \int \limits_0^n [x]dx=\large\frac{n(n-1)}{2}$ if $n=2$ then $y=?$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
medium
q19
asked
Dec 13, 2013
by
meena.p
1
answer
Which of following is false for salt bridge?
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q19
medium
asked
Dec 10, 2013
by
sreemathi.v
1
answer
The structure of $XeO_3$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q19
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
Xanthomonas citri posses :
jeemain
eamcet
biology
2002
q19
asked
Dec 6, 2013
by
thanvigandhi_1
0
answers
A type of fuel containing
jeemain
chemistry
unit21
organic-chemistry
q19
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 4, 2013
by
sreemathi.v
1
answer
Arrange the following alkenes in increasing order of their enthalphy of hydrogenation
jeemain
chemistry
unit21
organic-chemistry
q19
medium
basic-organic-chemistry
class11
ch12
asked
Dec 3, 2013
by
sreemathi.v
1
answer
Mulching means :
jeemain
eamcet
biology
2001
q19
asked
Dec 1, 2013
by
thanvigandhi_1
0
answers
Allotropes of oxygen are :
jeemain
chemistry
unit15
p-block-elements
q19
easy
asked
Nov 26, 2013
by
sreemathi.v
1
answer
If $A,B,C$ are the angles of a $\Delta$le then the value of the determinant $\small\begin{vmatrix}-1+\cos B&\cos C+\cos B&\cos B\\\cos C+\cos A&-1+\cos A&\cos A\\-1+\cos B&-1+\cos B&-1\end{vmatrix}$ is
jeemain
math
class12
ch4
determinants
q19
area-of-a-triangle
difficult
asked
Nov 25, 2013
by
sreemathi.v
1
answer
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