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Recent questions tagged jeemain

If $( x \in R: [x -|x|\;]=5)$ is equal to :

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 ?

asked Nov 11, 2013 by thanvigandhi_1

1 answer

Assertion (A) : Induced mutations are widely used in crop improvement. Reasons (R) : Physical and chemical mutagens cause genetic variability in a population and produce only desirable characters.

asked Nov 11, 2013 by thanvigandhi_1

1 answer

Which one of the following pairs of reactants does not form oxygen when they react with each other?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Match the following lists:

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct?

asked Nov 11, 2013 by meena.p

0 answers

The compound prepared by a substitution reaction of benzene is :

asked Nov 11, 2013 by meena.p

1 answer

In which of the following reactions, $MgO$ is not formed?

asked Nov 11, 2013 by meena.p

1 answer

The pH of a solution of $H_2O_2$ is $6.0$. some chlorine gas is bubbled into this solution. Which of the following is correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is a pair of functional isomers?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

At $550 K,$ the $K_c$ for the following reaction is $10^{4}\;mol^{-1}\;L$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following compounds is soluble in benzene but almost insoluble in water?

asked Nov 11, 2013 by meena.p

1 answer

Observe the following reaction : $2A +B \longrightarrow C$. The rate of formation of C is $2.2 \times 10^{-3}\;mol \;L^{-1} min ^{-1}.$ What is the value of $-\large\frac {d[A]}{dt}$ (in mol $L^{-1}\; min^{-1}$)?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not an air pollutant ?

asked Nov 11, 2013 by meena.p

0 answers

What is the quantity of electricity (in Coulombs) required to deposit all the silver from 250 mL of 1 M $AgNO_3$ solution ?

asked Nov 11, 2013 by meena.p

1 answer

Assertion (A) : The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 ($pK_a$ of acetic acid is 4.8). Reason (R) : The ionic product of water at $25^{\circ}C$ is $10^{-14}\;mol^{2}.L^{-2}.$

asked Nov 11, 2013 by meena.p

0 answers

Which of the following is not correct ?

asked Nov 11, 2013 by meena.p

0 answers

The vapour pressure of water at $23^{\circ} C$ is $19.8 \;mm. 0.1 $ mole of glucose is dissolved in $178.2\; g$ of water. What is the vapour pressure (in mm) of the resultant solution ?

asked Nov 11, 2013 by meena.p

0 answers

Study the following lists

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Study the following lists

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Study the following lists

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Closely and compactly arranged fundamental tissue is not found in :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Identify the plant in which the tangential walls of collocytes are excessively thickened but radial walls are thin :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Which one of the following statements related to plant structure are true ?

asked Nov 10, 2013 by thanvigandhi_1

0 answers

If there are 135 hydrogen bonds between two strands of a fragment of DNA double helix which contains 23 Guanine nitrogen basis, what is its total length ?

asked Nov 10, 2013 by thanvigandhi_1

1 answer

Activity of ligase enzyme is found in :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Identify the true statement in the following :

asked Nov 10, 2013 by thanvigandhi_1

1 answer

Assertion (A) : Phylogenetic systems of classification are considered as post-Darwinian. Reasons (R) : They are proposed after the publication of the book ' Origin of species '.

asked Nov 10, 2013 by thanvigandhi_1

0 answers

The ratio of the cohorts of the first two subclasses of Dicotyledonae in Bentham and Hooker classification is :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

The ratio of components of male flower of Smilax, female flower of Ruscus, modified reproductive shoots of Scilla and Tephrosia is :

asked Nov 10, 2013 by thanvigandhi_1

1 answer

Assertion (A) : In Fritillaria, the embryo sac is described as tetrasporic type. Reasons (R) : In Fritillaria, four megaspore mother cells are involved in the formation of an embryo sac.

asked Nov 10, 2013 by thanvigandhi_1

1 answer

Fruits which break at maturity into number of pieces equal to the number of carpels are found in :

asked Nov 10, 2013 by thanvigandhi_1

1 answer

From the following identify the plants having inflorescences with male, female and sterile flowers :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

Study the following lists

asked Nov 10, 2013 by thanvigandhi_1

0 answers

A teacher was explaining about a plant whose venation pattern is basically similar to Eryngium, fruit is berry and stem shows signs of perennation. He was trying to arrive at one of the following :

asked Nov 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a=\hat i+\hat j+\hat k,\:\:\overrightarrow a.\overrightarrow b=1$ and $\overrightarrow a\times\overrightarrow b=\hat j-\hat k,$ then $\overrightarrow b=?$

asked Nov 10, 2013 by rvidyagovindarajan_1

1 answer

The following plants are devoid of some vital organs. Arrange these in the order of absence of roots , stem, leaf, flower and fruits respectively :

asked Nov 10, 2013 by thanvigandhi_1

1 answer

Study the following lists

asked Nov 10, 2013 by thanvigandhi_1

0 answers

If $\overrightarrow a,\overrightarrow b\:\:and\:\:\overrightarrow c$ are non coplanar vectors, then for real $\lambda$, $[\lambda(\overrightarrow a+\overrightarrow b)\:\lambda^2\overrightarrow b\:\lambda\overrightarrow c]=[\overrightarrow a\:\overrightarrow b+\overrightarrow c\:\overrightarrow c]$, for:

asked Nov 10, 2013 by rvidyagovindarajan_1

1 answer

For any vector $\overrightarrow a$ the value of $(\overrightarrow a\times \hat i)^2+(\overrightarrow a\times \hat j)^2+(\overrightarrow a\times \hat i)^2=?$

asked Nov 10, 2013 by rvidyagovindarajan_1

1 answer

If $\overrightarrow a=\hat i+2\hat j+\hat k,\:\overrightarrow b=\hat i-\hat j+\hat k$ and $\overrightarrow c=\hat i+\hat j-\hat k$ and a vector $\overrightarrow d$ which is in the plane of $\overrightarrow a\:and\:\overrightarrow b$ and whose projection on $\overrightarrow c$ is $\large\frac{1}{\sqrt 3}, $ then $\overrightarrow d=?$

asked Nov 10, 2013 by rvidyagovindarajan_1

1 answer

If $\overrightarrow a, \:\overrightarrow b,\: \overrightarrow c$ are position vectors of the points $A,B,C$ respectively, then under what condition the three points $A,B,C$ are collinear?

asked Nov 10, 2013 by rvidyagovindarajan_1

1 answer

Which one of the following is the ratio of the lowering of vapour pressure of 0.1 m aqueous solutions of $ BaCI_2, NACI\: and \: AI_2(SO_4)_3$ respectively ?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Under which one of the following conditions do real gases approach the ideal gas behaviour ?

asked Nov 9, 2013 by thanvigandhi_1

1 answer

19 gms of a mixture containing $NaHCO_3\: and \: Na_2CO_3$ on complete heating liberated 1.12 lit of $CO_2$ at STP. The weight of the remaining solid was 15.9 gms. What is the weight ( in g ) of $Na_2CO_3$ in the mixture before heating ?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

In which of the following pairs, the central atoms have the same number of lone pairs of electrons ?

asked Nov 9, 2013 by thanvigandhi_1

1 answer

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