Recent questions tagged 68

In which of the following devices, the eddy current effect is not used ?

asked Jul 8, 2019 by pady_1

1 answer

The first emission line of hydrogen atomic spectrum in the Balmer series appears at (R = Rydberg constant) :

asked Dec 19, 2018 by pady_1

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Which of the following set of raw materials are used in the manufacture of $Na_2CO_3$ by Solvay process ?

asked Dec 19, 2018 by pady_1

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Ethylene reacted with bromine in $CCl_4$ to form $X$. $X$ is treated with alcoholic $KOH$ to give $Y$. $X$ and $Y$ are respectively :

asked Dec 19, 2018 by pady_1

1 answer

Which one of the following pairs of compounds are functional isomers ?

asked Dec 11, 2018 by pady_1

0 answers

Three identical blocks of masses $m = 2\; kg$ are drawn by a force $F=10.2 N$ with an acceleration of $0.6\;ms^{-2}$ on a frictionless surface, then what is the tension (in $N$) in the string between the blocks B and C ?

asked Dec 11, 2018 by pady_1

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To demonstrate the phenomenon of interference we require two sourcces which emit radiations of :

asked Dec 11, 2018 by pady_1

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Hydrogen peroxide oxidises $[Fe(CN)_6]^{4-}$ to $[Fe(CN)_6]^{3-}$ in acidic medium but reduces $[Fe(CN)_6]^{3-}$ to $[Fe(CN)_6]^{4-}$ in alkaline medium. The other products formed are, respectively.

asked Dec 11, 2018 by pady_1

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The Tyndall effect is observed only when following conditions are satisfied : (a) The diameter of the dispersed particles is much smaller than the wavelength of the light used. (b) The diameter of the dispersed particles is not much smaller than the wavelength of the light used (c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. (d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

asked Dec 11, 2018 by pady_1

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If the $2^{nd},\; 5^{th}$ and $9^{th}$ terms of a non-constant A.P. are in G.P., then the common ratio of this G.P. is :

asked Dec 11, 2018 by pady_1

1 answer

If the coefficients of the three successive terms in the binomial expansion of $(1+x)^n$ are in the ratio $1 : 7 : 42$, then the first of these terms in the expansion is :

asked Dec 11, 2018 by pady_1

1 answer

In $S_N2$ reactions, the correct order of reactivity for the following compounds: $CH_3Cl, \;CH_3CH_2Cl,\; (CH_3)_2CHCl$ and $(CH_3)_3CCl$ is:

asked Dec 11, 2018 by pady_1

0 answers

Two coherent point sources $S_1$ and $S_2$ are separated by a small distance â€˜dâ€™ as shown. The fringes obtained on the screen will be:

asked Dec 11, 2018 by pady_1

0 answers

The species which can best serve as an initiator for the cationic polymerization is :

asked Dec 11, 2018 by pady_1

0 answers

a' and 'b' are van der Waals' constants for gases. Chlorine is more easily liquefied than ethane because

asked Dec 11, 2018 by pady_1

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If the vectors $\overrightarrow{a} = \hat{i} - \hat{j} + 2 \hat{k}, \; \overrightarrow{b} = 2 \hat{i} + 4 \hat{j} + \hat{k}$ and $\overrightarrow{c} = \lambda \hat{i} + \hat{j} + \mu \hat{k}$ are mutually orthogonal, then $(\lambda, \mu)$ =

asked Dec 11, 2018 by pady_1

0 answers

Let the line $\frac{x-2}{3} = \frac{y-1}{-5} = \frac{z+2}{2}$ lies in the plane $x+3y -\alpha z + \beta = 0$. Then $(\alpha, \beta)$ equals

asked Nov 29, 2018 by pady_1

0 answers

The treatment of $CH_3MgX$ with $CH_3C\equiv C-H$ produces

asked Nov 29, 2018 by pady_1

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Two identical conducting wires AOB and COD are placed at right angles to each other. The wire AOB carries an electric current $I_1$ and COD carries a current $I_2$. The magnetic field on a point lying at a distance d from O, in a direction perpendicular to the plane of the wires AOB and COD, will be given by :

asked Nov 29, 2018 by pady_1

0 answers

Phenyl magnesium bromide reacts with methanol to give :

asked Nov 13, 2018 by pady_1

0 answers

A particle is projected from a point $O$ with velocity $u$ at an angle of $60^{\circ}$ with the horizontal. When it is moving in a direction at right angle to its direction at O, then its velocity is given by :

asked Nov 5, 2018 by pady_1

0 answers

An energy source will supply a constant current into the load, if its internal resistance is :

asked Nov 5, 2018 by pady_1

0 answers

A random variable $X$ has the probability distribution :

asked Nov 5, 2018 by pady_1

0 answers

Iron exhibits bcc structure at room temperature. About $900^oC$, it transforms to fcc structure. The ratio of density of iron at room temperature to that at $900^oC$ (assuming molar mass and atomic radii of iron remains constant with temperature) is

asked Aug 21, 2018 by pady_1

1 answer

Zygotic meiosis is characteristic of :

asked Aug 21, 2018 by pady_1

1 answer

Name the chronic respiratory disorder caused mainly by cigarette smoking

asked Aug 21, 2018 by pady_1

1 answer

The DNA molecule to which the gene of interest is integrated for cloning is called -

asked Aug 21, 2018 by pady_1

1 answer

(a) $H_2O_2 + O_3 \to H_2O + 2O_2$ (b) $H_2O_2 + Ag_2O \to 2Ag +H_2O + O_2$ Role of hydrogen peroxide in the above reactions is respectively :

asked Aug 20, 2018 by pady_1

1 answer

Identify the correct order of solubility in aqueous medium-

asked Aug 20, 2018 by pady_1

1 answer

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

asked Aug 20, 2018 by pady_1

2 answers

Which one of the following statements for the order of a reaction is incorrect ?

asked Aug 16, 2018 by pady_1

1 answer

Aniline in a set of the following reactions yielded a coloured product 'Y'. <img src="/>

asked Jul 26, 2018 by pady_1

2 answers

Half-life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is :

asked Jul 26, 2018 by pady_1

1 answer

Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order ?

asked Jul 26, 2018 by pady_1

1 answer

The fraction of total volume occupied by the atoms present in a simple cube is :

asked Jul 26, 2018 by pady_1

1 answer

For the reaction : $2A+B\to 3C+D$ Which of the following does not express the reaction rate:-

asked Jul 25, 2018 by pady_1

0 answers

The energy of second Bohr orbit of the hydrogen atom is $–328\; g\;mol^{-1}$; hence the energy of fourth Bohr orbit would be :-

asked Jul 24, 2018 by pady_1

1 answer

Number of chiral carbons in $ \beta–D–(+)– $ glucose is: -

asked Jul 24, 2018 by pady_1

1 answer

Formation of a solution from two components can be considered as : (i) Pure solvent $\to$ separated solvent molecules, $ \Delta H_1$ (ii) Pure solvent $\to$ separated solvent molecules, $ \Delta H_2$ (iii) Separated solvent and solute molecules $\to$ solution, $\Delta H_3$ Solution so formed will be ideal if : -

asked Jul 24, 2018 by pady_1

1 answer

Which reaction is not feasible : -

asked Jul 23, 2018 by pady_1

1 answer

Change in enthalpy for reaction $2 H_2O_2 (\ell) \to 2 H_2O (\ell) + O_2 (g)$ If heat of formation of $H_2O_2 (\ell) $ and $H_2O (\ell)$ are -188 & -286 KJ/mol respectively :-

asked Jul 20, 2018 by pady_1

1 answer

Correct relation b/w dissociation constant's of a di-basic acid :

asked Jul 20, 2018 by pady_1

1 answer

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of bunsen burner A, B, C and D respectively are:

asked Jun 15, 2018 by pady_1

1 answer

Which of the following 2 statements is true Statement 1 : All rectangles are squares. Statement 2 : All squares are rectangles

asked Dec 31, 2015 by pady_1

1 answer

Type the missing numbers in this sequence: 12, ----- , 32, 42, ------ , 62

asked Dec 31, 2015 by pady_1

1 answer

Irene's dining room is 6 metres wide and 7 metres long. Irene wants to install a new wood floor. It will cost Rs321.00 per square metre. How much will Irene's new floor cost?

asked Dec 31, 2015 by pady_1

1 answer

Ron and two of his friends ate one-fourth each of an eight slice pizza. Find the remaining slice of the pizza.

asked Dec 31, 2015 by pady_1

1 answer

A merchant bought a table fan for \$575 and sold for \$ 500. Find the loss of the merchant in the transaction?

asked Dec 31, 2015 by pady_1

0 answers

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