Recent questions tagged jeemain

In nature,abundance of $^1H_1$ and $^2H_1$ are 99.985 and 0.015 percent respectively and water obtained from it contains $H_2O$ and $D_2O$.The number of $D_2O$ molecules in 400mL water (if density is assumed to be 1.0g/mL) will be :

asked Oct 25, 2013 by sreemathi.v

1 answer

Haemoglobin $(C_{2952}H_{9664}N_{812}O_{832}S_8Fe_4)$ is oxygen carrier. If a person has $5L$ blood and each mL of blood has $5\times 10^9$ R.B.C and each R.B.C has $2.8\times 10^8$ haemoglobin molecules, then how many grams of haemoglobin is present in the body of that person?

asked Oct 25, 2013 by sreemathi.v

1 answer

A silicon (atomic weight=28) chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon (Si) atoms are present in this chip.

asked Oct 25, 2013 by sreemathi.v

1 answer

In the first world war ,$1.1\times 10^8$kg of position gas were fired on the allied forces.If the gas is assumed to be phosgene,how many molecules of the gas correspond to the amount fired on allied forces.

asked Oct 25, 2013 by sreemathi.v

1 answer

$\large\frac{2}{3}$ of the atoms in water molecule are hydrogen .What % weight of a water molecule is the weight of 2 hydrogen atoms:

asked Oct 25, 2013 by sreemathi.v

1 answer

16g $SO_x$ occupies 5.6 litres at STP. Assuming the nature of the gas to be ideal, the value of $x$ is

asked Oct 25, 2013 by sreemathi.v

1 answer

$\sec\;h^{-1} (\sin \theta)$ is equal to

asked Oct 24, 2013 by meena.p

0 answers

The value of x, where $ x > 0 $ and $\tan \bigg(\sec^{-1}\bigg(\large\frac{1}{x}\bigg)\bigg)$$=\sin (\tan ^{-1}2)$ is

asked Oct 24, 2013 by meena.p

1 answer

If $a,b,c$ are in AP. $b-a,c-b$ and a are in GP. then $a:b:c$ is

asked Oct 24, 2013 by meena.p

1 answer

$\sin A+ \sin B= \sqrt {3} (\cos B- \cos A)$ => $\sin 3A+ \sin 3B$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

$\large\frac{\tan 80^{\circ} -\tan 10^{\circ}}{\tan 70^{\circ}}$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

If $\cos (A-B)=3/5$ and $\tan A \tan B=2$. then which one of the following is true?

asked Oct 24, 2013 by meena.p

1 answer

If $\theta$ lies in the first quadrant and $5\;\tan \theta=4$, then $\large\frac{5 \sin \theta -3 \cos \theta}{\sin \theta+ 2 \cos \theta}$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

A value of n such that $\bigg(\large\frac{\sqrt 3}{2}+\frac{i}{2}\bigg)^n$$=1$ is

asked Oct 24, 2013 by meena.p

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The locus of the point $z=x+iy$ satisfying $\bigg|\large\frac{z-2i}{z+2i} \bigg|$$=1$ is

asked Oct 24, 2013 by meena.p

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If $a=\large\frac{1-i \sqrt 3}{2},$ then the correct matching of List I from List II is

asked Oct 24, 2013 by meena.p

1 answer

Which one of the following statement is correct for an electrolyte solution when its concentration is decreased?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The synthetic semi permeable membrane used in Berkeley-Hartley method is

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Which one of the following solutions has a lowest freezing point?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The number of non-arrival solutions of the system $x-y+z=0, x+2y-z=0,2x+y+3z=0$ is

asked Oct 24, 2013 by meena.p

1 answer

Which one of the following gases has the same RMS velocity at $ 27^{\circ}C$ as that of $N_2$ with RMS velocity of $ 5.0 \times 10^4\: cm.s^{-1}$ at $ 7^{\circ}C$?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

If A is a square matrix such that $A(adj \;A)=\begin {bmatrix} 4 & 0 & 0 \\ 0 & 4 & 0 \\ 0 & 0 & 4 \end {bmatrix}$, then det (adj A) $ is equal to

asked Oct 24, 2013 by meena.p

1 answer

Which one of the following is an example for disproportionation reaction?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

If $\begin {bmatrix} 1 & 2 & x \\ 4 & -1 & 7\\ 2 & 4 & -6\end{bmatrix}$ is a singular matrix, then x is equal to

asked Oct 24, 2013 by meena.p

1 answer

If $\alpha,\beta,\gamma$ are the roots of $x^3-2x^2+3x-4=0,$ then the value of $\alpha^2\beta^2+\beta^2 \gamma^2+\gamma^2 \alpha^2$ is

asked Oct 24, 2013 by meena.p

1 answer

If 1,2,3 and 4 are the roots of the equation $x^4+ax^3+bx^2+cx+d=0$, then $a+2b+c$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

The set of values of x for which the inequalities $x^2-3x-10 < 0, 10 x - x^2 -16 >0 $ hold simultaneously, is

asked Oct 24, 2013 by meena.p

1 answer

If $\alpha$ and $\beta$ are the roots of the equation $ax^2+bx+c=0$ and , if $px^2+qx+r=0$ has roots $\large\frac{1- \alpha}{\alpha}$ and $\large\frac{1-\beta}{\beta}$, then r is equal to

asked Oct 24, 2013 by meena.p

1 answer

$\large\frac{1}{2}-\frac{1}{2, 2^2}+\frac{1}{3.2^3}-\frac{1}{4.2^4}+.........$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

Which one of the followng is correct regarding $ \sigma $ molecular orbital?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The coefficient of $x^k$ in the expansion of $\large\frac{1-2x-x^2}{e^{-x}}$ is

asked Oct 24, 2013 by meena.p

1 answer

If $\large\frac{3x}{(x-a)(x-b)}=\frac{2}{x-a}+\frac{1}{x-b}$ then $a:b$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

Which one of the following is not correct?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The sum of the series $\large\frac{3}{4.8}-\frac{3.5}{4.8.12}+\frac{3.5.7}{4.8.12.16}-...........$

asked Oct 24, 2013 by meena.p

1 answer

If $a_k$ is the coefficient of $x^k$ in the expansion of $(1+x+x^2)^n$ for $k=0,1,2.......,2n$ then $a_1+2a_2+3a_3+.....+2na_{2n}$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

Assertion (A) : In the formation of oxide ion, $ O^{2-}(g) $ , first an exothermic reaction and then an endothermic reaction takes place. Reasons (R) : $O^- $ ion has comparatively large size than oxygen atom.

asked Oct 24, 2013 by thanvigandhi_1

1 answer

If a polygon of n sides has 275 diagonals, then n is equal to

asked Oct 24, 2013 by meena.p

1 answer

in the wave numbers of the first ( lowest ) two lines of a series of hydrogen atomic spectrum is $ 5331.7\: cm^{-1}$, they belong to the $(R_H = 109680\: cm^{-1}$)

asked Oct 24, 2013 by thanvigandhi_1

1 answer

The number of ways of arranging 8 men and 4 women around a circular table such that no two women can sit together is

asked Oct 24, 2013 by meena.p

1 answer

The first spectral line in the Pfund series of Hydrogen spectrum is given by $(R_H$ = Rydberg constant )

asked Oct 24, 2013 by thanvigandhi_1

1 answer

If $S_n= 1^3+2^3+......+n^3$ and $T_n=1+2......+n$, then

asked Oct 24, 2013 by meena.p

1 answer

Which reaction produces $SO_2$?

asked Oct 24, 2013 by thanvigandhi_1

0 answers

If $a^x=b^y=c^z=d^w$, the value of $x \bigg(\large\frac{1}{y}+\frac{1}{z}+\frac{1}{w}\bigg)$ is

asked Oct 24, 2013 by meena.p

1 answer

An oxide of nitrogen (X) is formed when Z is reacted with $P_2O_5$. X is soluble in water and gives Z. Which one of the following is Z?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Chlorophyll,a green coloring matter contains 2.68% mg.The number of atoms of mg present 1g chlorophyll are

asked Oct 24, 2013 by sreemathi.v

1 answer

$\sqrt {2+\sqrt {5}-\sqrt{6-3 \sqrt {5}+\sqrt {14-6 \sqrt{5}}}}$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

The reaction that gives $CO_2$ as one of the product is

asked Oct 24, 2013 by thanvigandhi_1

0 answers

Which of the following statements are correct?

asked Oct 24, 2013 by thanvigandhi_1

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If $R \to R$ and $g: R \to R$ are defined by $f(x)=x-[x]$ and $g(x)=[x]$ for $x \in R,$ where $[x]$ is the greatest integer not exceeding x, then for every $x \in R, f(g(x))$ is equal to

asked Oct 24, 2013 by meena.p

1 answer

If $f: R \to R$ and defined by $f(x)=\large\frac{1}{2-\cos 3x}$ for each $ x \in R$, then the range of f is

asked Oct 24, 2013 by meena.p

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