Recent questions tagged 58

A copper rod of 88 cm and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is : ($\propto Cu=1.7\times10^{-5}K^{-1}and \propto Al=2.2\times 10^{-5}K^{-1}$)

asked Jul 8, 2019 by pady_1

1 answer

The pH of a solution is increased from 3 to 6. Its $H^+$ ion concentration will be :

asked Dec 19, 2018 by pady_1

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A burnning strip of Mg is introduced inti a jar containing a gas. After sometime the walls of the container are coated with carbon. The gas in the container is :

asked Dec 19, 2018 by pady_1

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Which of the following is the strongest oxidising agent ?

asked Dec 19, 2018 by pady_1

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The catenation tendency of $C, Si $ and $Ge$ is in the order $Ge < Si < C$. The bond energies (in $kJ\; mol^{-1}$) of $C-C, \; Si-Si$ and $Ge-Ge$ bonds, respectively are :

asked Dec 11, 2018 by pady_1

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Even Carnot engine cannot give 100% efficiency because we cannot :

asked Dec 11, 2018 by pady_1

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A metal wire of linear mass density of 9.8 g/m is streched with a tension of 10 kg-wt between two rigid supports 1 m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating source is :

asked Dec 11, 2018 by pady_1

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From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. The number of such arrangements is :

asked Dec 11, 2018 by pady_1

1 answer

An external pressure P is applied on a cube at $0^{\circ}C$ so that it is equally compressed from all sides. $K$ is the bulk modulus of the material of the cube and $\alpha$ is its coefficient of linear expansion. Suppose we want to bring the cube to its original size by heating. The temperature should be raised by :

asked Dec 11, 2018 by pady_1

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Thiol group is present in :

asked Dec 11, 2018 by pady_1

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Complete hydrolysis of starch gives :

asked Dec 11, 2018 by pady_1

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The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0$ and $l^2 = m^2 + n^2$ is

asked Dec 11, 2018 by pady_1

1 answer

If the equation $x^2 + 2x + 3 = 0$ and $ax^2 + bx + c = 0, a, b, c \in R$, have a common root, then a : b : c$ is

asked Dec 11, 2018 by pady_1

1 answer

A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading : 58.5 degree Vernier scale reading : 09 divisions Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 divisions of the main scale. The angle of the prism from the above data

asked Dec 11, 2018 by pady_1

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The value of p and q for which the function $ f(x) = \begin{cases} \frac{\sin (p+1) x + \sin x}{x} &, x < 0 \\ \; \; \;\; \;q &, x = 0 \\ \frac{\sqrt{x+x^2} - \sqrt{x}}{x^{3/2}} & , x > 0 \end{cases} $ is continuous for all $x$ in $R$, is

asked Dec 11, 2018 by pady_1

0 answers

The speed of light in the medium is

asked Dec 11, 2018 by pady_1

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In Cannizzaro reaction given below $2 Ph \; CHO \xrightarrow{\overset{(-)}{: OH}} Ph \; CH_2OH + PhC\overset{..}{O}_2^{(-)}$ the slowest step is :

asked Nov 29, 2018 by pady_1

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The ionization enthalpy of hydrogen atom is $1.312 \times 10^6 Jmol^{-1}$. The energy required to excite the electron in the atom from n = 1 to n = 2 is

asked Nov 29, 2018 by pady_1

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Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?

asked Nov 29, 2018 by pady_1

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The increaing order of the rate of HCN addition to compound A-D is : (A) $HCHO$ (B) $CH_3COCH_3$ (C) $PhCOCH_3$ (D) $PhCOPh$

asked Nov 13, 2018 by pady_1

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A random variable $X$ has Poisson distribution with mean 2. Then $P(X > 1.5)$ equals :

asked Nov 5, 2018 by pady_1

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Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are $+q$ and $-q$. The potential difference between the centres of the two rings is :

asked Nov 5, 2018 by pady_1

0 answers

If the straight lines $x=1+s,\;y = -3 -\lambda s, \; z = 1 + \lambda s$ and $x= \frac{t}{2},\; y=1+t,\;z=2-t$ with parameters s and t respectively, are co-planar then $\lambda$ equals

asked Nov 5, 2018 by pady_1

0 answers

For the redox reaction $MnO_4^- + C_2O_4^{2-} + H^+ \to Mn^{2+} + CO_2 + H_2O$ The correct coefficients of the reactants for the balanced equation are

asked Aug 21, 2018 by pady_1

1 answer

Which one of the following statements is correct with reference to enzymes ?

asked Aug 21, 2018 by pady_1

1 answer

Water soluble pigments found in plant cell vacuoles are -

asked Aug 21, 2018 by pady_1

1 answer

In which of the following interactions both partners are adversely affected ?

asked Aug 21, 2018 by pady_1

1 answer

For the reversible reaction : $N_2 (g) + 3H_2(g) \leftrightharpoons 2NH_3 (g) + heat$ The equilibrium shifts in forward direction -

asked Aug 20, 2018 by pady_1

1 answer

Dipole - induced dipole interactions are present in which of the following pairs :

asked Aug 20, 2018 by pady_1

1 answer

In Freundlich Adsorption isotherm, the value of $\frac{1}{n}$ is :

asked Aug 20, 2018 by pady_1

1 answer

For the reaction $N_2 (g) + O_2(g) \leftrightharpoons 2NO (g)$, the equilibrium constant is $K_1$. The equilibrium constant is $K_2$ for the reaction $2NO(g) + O_2(g) \rightleftharpoons 2NO_2 (g).$ What is $K$ for the reaction $NO_2 (g) \rightleftharpoons 1/2 N_2 (g) + O_2 (g)$ ?

asked Aug 16, 2018 by pady_1

1 answer

If pH of a saturated solution of $Ba(OH)_2$ is 12, the value of its $K_{(SP)}$ is

asked Jul 26, 2018 by pady_1

1 answer

What is the |$ [OH^-] $| in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M $ Ba(OH)_{2}$ ? -

asked Jul 26, 2018 by pady_1

1 answer

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of -

asked Jul 26, 2018 by pady_1

1 answer

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately : ($\log 4 = 0.60, \log 5 = 0.69$)

asked Jul 26, 2018 by pady_1

1 answer

CsBr crystallizes in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being $6.02\times10^{23} mol^{-1} $, the density of CsBr is:-

asked Jul 25, 2018 by pady_1

1 answer

Which amongst the following is the most stable carbocation :-

asked Jul 24, 2018 by pady_1

1 answer

Which of the following is considered to be an anticancer species :-

asked Jul 24, 2018 by pady_1

1 answer

In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the above condition in the end :

asked Jul 24, 2018 by pady_1

1 answer

Vander waal's real gas, act as a ideal gas, at which conditions : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is not correctly matched

asked Jul 20, 2018 by pady_1

1 answer

Reduction by $LiAlH_4$ of hydrolysed product of an ester gives :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following does not give claisen condensation reaction :

asked Jun 15, 2018 by pady_1

1 answer

Six friends A, B, C, D, E and F are sitting around a circular table. B is sitting between C and D, E is sitting between F and A. If C is sitting on right of A, who is sitting between E and C ?

asked Dec 31, 2015 by pady_1

1 answer

The class mark of the class 15-25 is

asked Dec 31, 2015 by pady_1

0 answers

Find the volume of a cube of side 21 cm.

asked Dec 31, 2015 by pady_1

1 answer

Shyam and Sanjana have bookshelves of the same size and holding books of the same sizes. Shyam's shelf is $\large\frac{1}{2}$ full and Sanjana's shelf is $\large\frac{1}{3}$ full. If 63 more books of the same size are distributed among them, then they can fill their shelves completely. How many books does Sanjana have today?

asked Dec 31, 2015 by pady_1

1 answer

A 9-kilogram bag of cat food costs ₹648.00. What is the unit price?

asked Dec 31, 2015 by pady_1

0 answers

Two blocks A and B of mass m and 2m are connected by a massless spring of force constant k. They are placed on smooth horizontal plane . Spring is streched by an amount x and then released . the relative velocity of the blocks when the spring come its natural length is

asked Aug 6, 2013 by meena.p

1 answer

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