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Recent questions tagged q20
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Three rods of Copper, Brass and Steel are welded together to form a $Y$- shaped structure. Area of cross -section of each rod $= 4 cm^2$. End of copper rod is maintained at $10^{\circ}C$.Lengths of the copper, brass and steel rods are $46, 13 \;and \;12\; cms$ respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivies of copper, brass and steel are $0.92, 0.26\; and\; 0.12$ CGS units respectively. Rate of heat flow through copper rod is
jeemain
jeemain-2014
physics
q20
medium
asked
Apr 7, 2014
by
meena.p
1
answer
Evaluate the given limit $ \lim\limits_{x \to 0} \large\frac{ \sin \: ax+bx}{ax+ \sin \: bx}$$a,b, a+b \neq0$
math
cbse
class11
ch13
limits-and-derivatives
bookproblem
limits
exercise13-1
p301-303
q20
asked
Apr 5, 2014
by
thanvigandhi_1
1
answer
Find the equation of an ellipse that satisfies the following conditions: Major axis on x-axis, passes through the points $(4,3)$ and $(6.2)$
cl35726
cl35717
math
cbse
class11
ch11
exercise11-3
conic-sections
ellipse
q20
easy
sec-a
asked
Apr 3, 2014
by
balaji.thirumalai
1
answer
If $a,b,c$ are in A.P., $b,c,d$ are in G.P. and $\large\frac{1}{c},\frac{1}{d},\frac{1}{e}$ are in A.P., then prove that $a,c,e$ are in G.P.$
cbse
class11
ch9
bookproblem
misc
sec-b
medium
q20
math
sequences-and-series
asked
Apr 2, 2014
by
rvidyagovindarajan_1
1
answer
Which of the following is the simplest carbohydrate?
jeemain
aipmt
chemistry
biomolecules
organic-chemistry
cbse
class12
unit16
easy
q20
asked
Mar 27, 2014
by
thanvigandhi_1
1
answer
If $ x = \cos\: t ( 3-2 \: \cos^2 t)\: and \: y = \sin \: t ( 3-2 \sin^2\: t)$ find the value of $ \large\frac{dy}{dx} $ at $ t = \large\frac{\pi}{4}$
modelpaper-2014-chennai
cbse
class12
math
sec-b
q20
asked
Mar 25, 2014
by
thanvigandhi_1
1
answer
Identify the product $C$ in the sequence
jeemain
aipmt
chemistry
nitrogen
organic-chemistry
cbse
class12
unit13
q20
medium
asked
Mar 21, 2014
by
thanvigandhi_1
1
answer
Golvanized iron pipes are made by 'hot dipping'
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q20
medium
asked
Mar 17, 2014
by
meena.p
1
answer
“The entropy of a perfect crystal at absolute zero is zero”. The statement corresponds to which law of thermodynamics
jeemain
physics
thermodynamics
cbse
class11
class12
q20
easy
asked
Mar 15, 2014
by
thanvigandhi_1
1
answer
What is the percentage of ionic character of HCl.If $\mu=1.02D$, bond length is $1.275\overset{\circ}{A}$ ($e=4.8\times 10^{-10}$e.s.u)?
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q20
difficult
asked
Mar 10, 2014
by
sreemathi.v
1
answer
Polymer used in bullet proof glass is
jeemain
aipmt
chemistry
cbse
unit5
class12
organic-chemistry
polymers
q20
easy
asked
Mar 6, 2014
by
thanvigandhi_1
1
answer
The number of electron(s) in the $\sigma 2p$ molecular orbital in $N_2^{2+}$ is/are
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
molecular-orbital-theory
q20
easy
asked
Mar 4, 2014
by
sreemathi.v
1
answer
Show that the product of the corresponding terms of the sequences $a,ar,ar^2.........ar^n$ and $A,AR,AR^2.............AR^{n-1}$ form a G.P. and find the common ratio.
cbse
class11
ch9
bookproblem
exercise9-3
medium
sec-a
q20
math
sequences-and-series
asked
Mar 1, 2014
by
rvidyagovindarajan_1
1
answer
Which of the following amine is less basic than aniline?
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q20
easy
asked
Feb 28, 2014
by
sreemathi.v
1
answer
Most stable carbonium ion is
jeemain
chemistry
class11
organic-chemistry
q20
difficult
basic-organic-chemistry
ch12
asked
Feb 21, 2014
by
meena.p
3
answers
Which of the following will be the best reagent for below transformation
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q20
easy
asked
Feb 19, 2014
by
sreemathi.v
1
answer
The root mean square speed of an ideal gas at constant pressure varies with density d as
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q20
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
The colligative properties depend upon
jeemain
chemistry
class12
ch2
solutions
q20
easy
colligative-properties
basics
asked
Feb 12, 2014
by
sreemathi.v
1
answer
Find the vertices of the square if one of its vertices is (1,1) and the square passes through origin?
jeemain
math
class11
coordinate-geometry
straight-lines
distance-of-a-point-from-a-line
ch10
q20
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Find the degree of the following differential equation $\bigg(\large\frac{d^2 y}{dx^2}\bigg)^{1/2} =\bigg( \large\frac{dy}{dx}+3\bigg)^{1/3}$
jeemain
math
class12
ch9
differential-equations
degree-of-a-differential-equation
q20
easy
asked
Feb 3, 2014
by
meena.p
1
answer
Potassium hexa chloro platinate(IV) is
jeemain
chemistry
class12
coordination-compounds
unit9
q20
easy
asked
Jan 31, 2014
by
sreemathi.v
1
answer
Which of the following is reverse biased diode.
jeemain
physics
class12
unit19
ch14
q20
easy
concepts
junction-diodes
semiconductor-electronics
asked
Jan 27, 2014
by
meena.p
1
answer
Magnesium is present in
jeemain
chemistry
class11
s-block-elements
unit10
q20
easy
asked
Jan 27, 2014
by
sreemathi.v
1
answer
The statement $ p V q \Rightarrow \: p \wedge q$ is a
jeemain
math
mathematical-reasoning
class11
ch14
difficult
implications-(tautology-contradiction.)
q20
asked
Jan 23, 2014
by
thanvigandhi_1
1
answer
During hydrogenation of oil the catalyst commonly used is
jeemain
chemistry
class11
hydrogen
unit9
q20
easy
asked
Jan 22, 2014
by
sreemathi.v
1
answer
The statement: 5 divides 20 if 5 divides -20, in if-then form would be
jeemain
math
mathematical-reasoning
class11
14
medium
statements
q20
asked
Jan 20, 2014
by
thanvigandhi_1
1
answer
Ozone layer is present in
jeemain
chemistry
class11
environmental-chemistry
unit14
q20
easy
asked
Jan 20, 2014
by
sreemathi.v
1
answer
Which is false?
jeemain
math
mathematical-reasoning
class11
ch14
easy
statements
q20
asked
Jan 17, 2014
by
thanvigandhi_1
1
answer
A random variable X follows binomial distribution with mean $ \alpha$ and variance $ \beta$ Then
jeemain
math
cbse
class12
probability
difficult
q20
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
A fair die is tossed repeatedly until a six is obtained. Let X denote the number of tosses required. The probability that $ x = 3$ equals
jeemain
math
cbse
class12
probability
medium
q20
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
Let $w$ be a complex cube root of unity with $ W \neq 1$. A fair die is thrown three times. If $r_1, r_2\:and \: r_3$ are the numbers obtained on the die, then the probability that $ W^{r_1}+W^{r_2}+W^{r_3}=0$ is
jeemain
math
cbse
class12
probability
medium
q20
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
The study of photoelectric effect is useful in understanding :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
atomic- models-(rutherford-and-thomson)
q20
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
$1\;g$ of impure $Na_2CO_3$ is dissolved in water and the solution is made upto $250\;ml$. To $50\;ml$ of this made up solution, $50\;ml$ of $0.1\;N\; HCl$ is added and the mixture after shaking well, required $10\;ml$ of $0.16\;N\; NaOH$ solution for complete neutralization. Calculate $\%$ purity of the sample of $Na_2CO_3$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q20
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
The probability of a man hitting a target is $ \large\frac{3}{4}$. He tries 5 times. The probability that the target will be hit at least 3 times is
jeemain
math
cbse
class12
probability
bionomial-distribution
easy
q20
asked
Jan 3, 2014
by
thanvigandhi_1
1
answer
Find n where 1536 is the nth term of the series 3,6,12---------------
jeemain
math
class11
ch9
sequences-and-series
easy
sum-of-n-terms-of-special-series
q20
asked
Jan 1, 2014
by
yamini.v
1
answer
The distance of the line $\overrightarrow r=2\hat i-2\hat j+3\hat k+\lambda(\hat i-\hat j+4\hat k)$ from the plane $x+5y+z=5$ is ?
jeemain
math
class12
ch11
3d-geometry
intersection-of-lines-and-planes
difficult
q20
asked
Dec 28, 2013
by
rvidyagovindarajan_1
1
answer
If $f(1)=1,f'(1)=2$ then $\lim\limits\large\frac{\sqrt{f(x)-1}}{\sqrt x-1}$ is
jeemain
math
class11
ch13
limits-and-derivatives
introduction to limits
easy
q20
asked
Dec 23, 2013
by
sreemathi.v
1
answer
Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 sec and the velocity of the wave is 300 m / sec . What is the phase difference between the oscillation of two points ?
aipmt
modelpaper
physics
2008
q20
asked
Dec 15, 2013
by
thanvigandhi_1
0
answers
$\int \limits_0^n \{x\} dx = \int \limits_0^n x-[x]dx=\large\frac{n}{2}$ if $n=2$ then $y=?$
jeemain
math
class12
unit9
integral-calculus
medium
q20
asked
Dec 13, 2013
by
meena.p
0
answers
Which electrolyte can be used for salt bridge between $Ag^+,Pb^{+2},Hg^{+2},Cu^{+},Te^+$ ions
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q20
difficult
asked
Dec 10, 2013
by
sreemathi.v
1
answer
The percentage of p -character in the orbital forming P-P bond in $P_4$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
hybridization
q20
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
In pedigree method of hybridization up to which generation, the plants are tested and released for cultivation ?
jeemain
eamcet
biology
2002
q20
asked
Dec 6, 2013
by
thanvigandhi_1
1
answer
Refer to the below reaction :
jeemain
chemistry
unit21
organic-chemistry
q20
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 5, 2013
by
sreemathi.v
1
answer
Which will have the highest heats of hydrogenation?
jeemain
chemistry
unit21
organic-chemistry
q20
medium
basic-organic-chemistry
class11
ch12
asked
Dec 3, 2013
by
sreemathi.v
1
answer
Soil transported by wind is known as
jeemain
eamcet
biology
2001
q20
asked
Dec 1, 2013
by
thanvigandhi_1
0
answers
Bond angle of $H_2O$ is
jeemain
chemistry
unit15
p-block-elements
q20
easy
sec-a
asked
Nov 26, 2013
by
sreemathi.v
1
answer
If a square matrices $A$ and $B$ are such that $AA^{\theta}=A^{\theta}A$, $BB^{\theta}=B^{\theta}B$, $AB^{\theta}=B^{\theta}A$ then $AB(AB)^{\theta}$ is equal to
jeemain
math
class12
ch3
matrices
q20
transpose-of-a-matrix
difficult
asked
Nov 25, 2013
by
sreemathi.v
1
answer
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