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Recent questions tagged q18
Questions
If $p$ is the length of perpendicular from the origin to the line whose intercepts on the axes are $a$ and $b$, then show that $ \large\frac{1}{p^2}$$= \large\frac{1}{a^2}$$ +\large\frac{1}{b^2}$
cbse
class11
ch10
straight-lines
bookproblem
exercise10-3
sec-c
q18
difficult
asked
May 18, 2014
by
thanvigandhi_1
1
answer
In a certain city,all telephone numbers have six digits,the first two digits always being 41 or 42 or 46 or 62 or 64.How many telephone numbers have all six digits distinct.
cbse
math
class11
ch7
permutations-and-combinations
exercise7-3
exemplar
q18
sec-b
medium
asked
May 15, 2014
by
sreemathi.v
1
answer
A sequence $b_0, b_1, b_2...$ is defined by letting $b_0=5$ and $b_k=4+b_{k-1}$ for all natural numbers $k $. Show that $b_n = 5+4n$ for all natural number $n$ using mathematical induction.
cbse
class11
ch4
mathematical-induction
exemplar
q18
asked
May 6, 2014
by
thanvigandhi_1
0
answers
Prove the following by using the principle of mathematical induction for all n ∈ N: \[\] $1+2+3+...+n<\large\frac{1}{8}$$(2n+1)^2$
cbse
class11
ch4
mathematical-induction
bookproblem
sec3
exercise-4.1
q18
asked
May 1, 2014
by
thanvigandhi_1
1
answer
Prove : $\large\frac{\sin x-\sin y}{\cos x+\cos y}$$=\tan\large\frac{x-y}{2}$
cbse
math
class11
ch3
trigonometric-functions
bookproblem
exercise3-3
q18
sec-b
medium
asked
Apr 17, 2014
by
sreemathi.v
1
answer
Find the derivative of the following functions ( it is to be understood that a, b, c, d, p, q, r and s are fixed non-zero constants and m and n are integers ) $\large\frac{\sec x - 1}{\sec x +1}$
math
cbse
class11
ch13
limits-and-derivatives
bookproblem
misc
p317-318
q18
asked
Apr 14, 2014
by
thanvigandhi_1
1
answer
From a tower of height $H$, a particle is thrown vertically upwards with a speed $u$. The time taken by the particles, to hit the ground, is n times that taken by it to reach the highest point of its path. The relation between $H, u\; and\; n$ is
jeemain
jeemain-2014
physics
q18
medium
asked
Apr 7, 2014
by
meena.p
1
answer
Evaluate the following limits $ \lim\limits_{ x \to 0} \large\frac{ ax + x\cos\: x}{b\sin \: x}$
math
cbse
class11
ch13
limits-and-derivatives
bookproblem
limits
exercise13-1
p301-303
q18
asked
Apr 3, 2014
by
thanvigandhi_1
1
answer
Find the equation of an ellipse that satisfies the following conditions: $b=3, c=4$, centre at origin and foci on x-axis.
cl35717
math
cbse
class11
ch11
exercise11-3
conic-sections
ellipse
q18
easy
sec-a
asked
Apr 3, 2014
by
balaji.thirumalai
1
answer
If $a$ and $b$ are roots of $x^2-3x+p=0$ and $c$ and $d$ are roots of $x^2-12x+q=0$, where $a,b,c,d$ form a G.P. then prove that $(q+p):(q-p)=17:15$
cbse
class11
ch9
bookproblem
misc
difficult
sec-c
q18
math
sequences-and-series
asked
Mar 31, 2014
by
rvidyagovindarajan_1
1
answer
The destruction of the biological nature and activity of proteins by heat or by chemical agent is called
jeemain
aipmt
chemistry
biomolecules
organic-chemistry
cbse
class12
unit16
easy
q18
asked
Mar 27, 2014
by
thanvigandhi_1
1
answer
Which of the following is least alkaline?
jeemain
aipmt
chemistry
nitrogen
organic-chemistry
cbse
class12
unit13
q18
medium
asked
Mar 21, 2014
by
thanvigandhi_1
1
answer
The melting points of $Cu,Ag$ and $Au$ follow the order.
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q18
medium
asked
Mar 17, 2014
by
meena.p
1
answer
For which of the following process, $ \Delta S_{total} \: is\: < 0$,
jeemain
physics
thermodynamics
cbse
class11
class12
q18
easy
asked
Mar 15, 2014
by
thanvigandhi_1
1
answer
Which of the following is the correct order of bond angle ?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q18
difficult
asked
Mar 10, 2014
by
sreemathi.v
1
answer
Which of the following is a copolymer?
jeemain
aipmt
chemistry
cbse
unit5
class12
organic-chemistry
polymers
q18
easy
asked
Mar 6, 2014
by
thanvigandhi_1
1
answer
$NH_3$ and $BF_3$ form an adduct readily because they form
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q18
easy
asked
Mar 4, 2014
by
sreemathi.v
1
answer
The number of isomer aromatic compounds possible for the formula $C_7H_9N$ is
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q18
easy
asked
Feb 28, 2014
by
sreemathi.v
1
answer
Find the sum to $n$ terms of the sequence $8,88,888,.............$
cbse
class11
ch9
bookproblem
exercise9-3
sec-b
medium
q18
math
sequences-and-series
asked
Feb 27, 2014
by
rvidyagovindarajan_1
1
answer
The pressure exerted by an electromagnetic wave of intensity $I$ on a non-reflecting surface is ($c$ is velocity of light)
jeemain
aipmt
physics
cbse
class12
ch8
electromagnetic-waves
q18
easy
asked
Feb 26, 2014
by
thanvigandhi_1
1
answer
The difference between any two consecutive interior angles of a polygon is $5^\circ$. If the smallest angle is $120^ \circ$, then find the number of sides of the polygon.
cbse
class11
ch9
bookproblem
exercise9-2
sec-b
medium
q18
math
sequences-and-series
asked
Feb 24, 2014
by
rvidyagovindarajan_1
1
answer
Which of the following acids has the smallest dissociation constant
jeemain
chemistry
class11
organic-chemistry
q18
medium
basic-organic-chemistry
ch12
asked
Feb 21, 2014
by
meena.p
1
answer
Haloform reaction may be depicted as follows :
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q18
easy
asked
Feb 19, 2014
by
sreemathi.v
1
answer
The rms velocity of hydrogen is $\sqrt7$ times the rms velocity of nitrogen. If T is the temperature of the gas, then
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquid-state
easy
q18
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
Find the equation of the line through (1,2) so that the segment of line intercepted between the axes is bisected at this point?
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q18
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Find the solution of differential equation : $\large\frac{dy}{dx}=\frac{x^2+y^2}{xy}$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q18
easy
asked
Feb 3, 2014
by
meena.p
1
answer
The secondary valency of chromium in $[Cr(CN)_3]Cl_3$ is
jeemain
chemistry
class12
coordination-compounds
unit9
q18
easy
asked
Jan 31, 2014
by
sreemathi.v
1
answer
Find the value of $\tan({\frac{1}{2}}\sin^{-1}{\frac{1}{4}})$
cbse
class12
ch2
q18
p37
exemplar
medium
sec-b
math
asked
Jan 28, 2014
by
rvidyagovindarajan_1
1
answer
Avalanche breakdown is due to
jeemain
physics
class12
unit19
ch14
q18
easy
semiconductor-electronics
concepts
asked
Jan 27, 2014
by
meena.p
1
answer
The number of water molecules in hydrated beryllium salt never exceeds
jeemain
chemistry
class11
s-block-elements
unit10
q18
easy
asked
Jan 27, 2014
by
sreemathi.v
1
answer
If a,b,c are the sides of a triangle, then the statement, “$ \large\frac{1}{(b+c)},\: \large\frac{1}{(c+a)},\: \large\frac{1}{(a+b)}$ are also the sides of the triangle”, is
jeemain
math
mathematical-reasoning
class11
ch14
difficult
implications-(tautology-contradiction.)
q18
asked
Jan 23, 2014
by
thanvigandhi_1
1
answer
The process of adsorption of hydrogen on palladium is known as
jeemain
chemistry
class11
hydrogen
unit9
q18
easy
asked
Jan 22, 2014
by
sreemathi.v
1
answer
The statement: A rectangle is a square if all the 4 sides are equal, in if-then form would be
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q18
asked
Jan 20, 2014
by
thanvigandhi_1
1
answer
COD is measure of
jeemain
chemistry
class11
environmental-chemistry
unit14
q18
easy
asked
Jan 20, 2014
by
sreemathi.v
1
answer
Which is a false statement?
jeemain
math
mathematical-reasoning
class11
ch14
easy
statements
q18
asked
Jan 17, 2014
by
thanvigandhi_1
1
answer
An integer is chosen at random from first two hundred numbers. Then the probability that the integer chosen is divisible by 6 or 8 is
jeemain
math
cbse
class12
probability
difficult
q18
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
A photon of 300nm is observed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm, the wavelength of second re-emitted photon is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q18
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
A fair coin is tossed 100 times. The probability of getting tails on odd number of times is
jeemain
math
cbse
class12
probability
bionomial-distribution
medium
q18
asked
Jan 9, 2014
by
thanvigandhi_1
1
answer
A small amount of $CaCO_3$ completely neutralized 525ml of N/10 HCl and no acid is left at the end.After converting all calcium chloride to $CaSO_4$,how much plaster of paris can be obtained?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q18
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
Two persons A and B have equal number of sons. There are three cinema tickets which are to be distributed among the sons of A and B. The probability that all the tickets go to sons of A is $ \large\frac{1}{20}$. The number of sons each of them is :
jeemain
math
cbse
class12
probability
independent-events
easy
q18
asked
Jan 3, 2014
by
thanvigandhi_1
1
answer
If both the roots of the quadratic equation $(b-c)x^2+(c-a)x+(a-b)=0$ are equal. Then $a, b, c$ are in
jeemain
math
class11
ch9
sequences-and-series
easy
arithmetic-progression
q18
asked
Dec 31, 2013
by
yamini.v
1
answer
If both the roots of the quadratic equation $(b-c)x^2+(c-a)x+(a-b)=0$ are equal.Then a,b,c are in
jeemain
math
class11
unit7
sequences-and-series
easy
q18
asked
Dec 31, 2013
by
yamini.v
0
answers
The line through the points $(5,1,a)\:\:and\:\:(3,b,1)$ crosses $yz$ plane at the point $(0,\large\frac{17}{2},-\frac{13}{2})$, then $(a,b)=?$
jeemain
math
class12
ch11
3d-geometry
intersection-of-lines-and-planes
q18
medium
asked
Dec 27, 2013
by
rvidyagovindarajan_1
1
answer
$\lim\limits_{n\to\infty}\large\frac{1^p+2^p+3^p+.....+n^p}{n^{p+1}}$ is
jeemain
math
class12
ch7
integrals
definite integrals as limit of sum
easy
q18
asked
Dec 20, 2013
by
sreemathi.v
1
answer
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