Recent questions tagged 55

A 800 turn coil of effective area $0.05 m^2$ is kept perpendicular to a magnetic field $5\times 10^{5}$ T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :

asked Jul 8, 2019 by pady_1

1 answer

One mole of argon gas will have least density at :

asked Dec 19, 2018 by pady_1

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Oxalic acid is heated with $conc. H_2SO_4$ when the resultant gases are passed over red hot carbon, $X$ is obtained. $X$ is :

asked Dec 19, 2018 by pady_1

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Calculate the heat of the formation $(\Delta H)$ of $CO$ (in kcal) from the following data : $I. \; C_{(graphite)} + O_{2(g)} \to CO_{2(g)} \; \; \; \; \; \; \Delta H = -94 \; kcal$ $II. \; CO_{(g)} + \frac{1}{2}O_{2(g)} \to CO_{2(g)} \; \; \; \;\; \; \Delta H = -68\; kcal $

asked Dec 19, 2018 by pady_1

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In organic reactions, sodium in liquid ammonia is used as :

asked Dec 11, 2018 by pady_1

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The time period of a charged particle undergoing a circulr motion in a unifrom magnetic field is independent of its :

asked Dec 11, 2018 by pady_1

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Which of the following parameters does not characterise the thermodynatic state of matter ?

asked Dec 11, 2018 by pady_1

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Let $\overrightarrow{u}$ be a vector coplanar with the vectors $\overrightarrow{a} = 2 \hat{i} + 3 \hat{j} - \hat{k} $ and $\overrightarrow{b} = \hat{j} + \hat{k}$. If $\overrightarrow{u}$ is perpendicular to and $\overrightarrow{a}$ and $\overrightarrow{u} \overrightarrow{b} = 24$, then $| \overrightarrow{u}|^2$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

A man grows into a giant such that his linear dimensions increase by a factor of 9. Assuming that his density remains same, the stress in the leg will change by factor of :

asked Dec 11, 2018 by pady_1

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The reaction of propene with $HOCl\; (Cl_2+H_2O)$ proceeds through the intermediate :

asked Dec 11, 2018 by pady_1

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In the presence of a small amount of phosphorous, aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $\alpha$ - hydrogen has been replaced by halogen. This reaction is known as :

asked Dec 11, 2018 by pady_1

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The locus of the foot of perpendicular drawn from the centre of the ellipse $x^2 + 3y^2 = 6$ on any tangent to it is

asked Dec 11, 2018 by pady_1

1 answer

If the vectors $\overline{AB} = 3 \hat{i} + 4 \hat{k}$ and $\overline{AC} = 5 \hat{i} - 2 \hat{j} + 4 \hat{k}$ are the sides of a triangles ABC, then the length of the median through A is

asked Dec 11, 2018 by pady_1

1 answer

A cylindrical tube, open at both ends, has a fundamental frequency, f, in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air-column is now

asked Dec 11, 2018 by pady_1

0 answers

Statement-1 : The point A (1, 0, 7) is the mirror image of the point B (1, 6, 3) in the line $\frac{x}{1} = \frac{y-1}{2} = \frac{z-2}{3}$ Statement-2 : The line $\frac{x}{1} = \frac{y-1}{2} = \frac{z-2}{3}$ bisects the line segment joining A (1, 0, 7) and B (1, 6, 3)

asked Dec 11, 2018 by pady_1

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For a particle in uniform circular motion the acceleration $\overrightarrow{a}$ at a point $P (R, \theta)$ on the circle of radius R is (here $\theta$ is measured from the x-axis)

asked Dec 11, 2018 by pady_1

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The set representing the correct order of ionic radius is :

asked Nov 29, 2018 by pady_1

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Four species are listed below: i. $HCO_3^{-}$ ii. $H_3O^+$ iii. $HSO_4^{-}$ iv. $HSO_3F$ Which one of the following is the correct sequence of their acid strength?

asked Nov 29, 2018 by pady_1

0 answers

Charges are placed on the vertices of a square as shown. Let $\overrightarrow{E}$ be the electric field and $V$ the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then :

asked Nov 29, 2018 by pady_1

0 answers

If the terminal speed of a sphere of gold (density = $19.5 \; kg/m^3$) is $0.2 \; m/s$ in a viscous liquid (density = $1.5\; kg/m^3$), find the terminal speed of a sphere of silver (density = $10.5 \; kg/m^3$) of the same size in the same liquid.

asked Nov 13, 2018 by pady_1

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The angle between the lines $2x = 3y = -z$ and $6x = -y = -4z$ is :

asked Nov 5, 2018 by pady_1

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When an unpolarized light of intensity $I_0$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is:

asked Nov 5, 2018 by pady_1

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A line makes the same angle $\theta$, with each of the $x$ and $z$-axis. If the angle $\beta$, which it makes with $y-axis$, is such that $\sin^2 \beta = 3 \sin^2 \theta$, then $\cos^2 \theta$ equals

asked Nov 5, 2018 by pady_1

0 answers

The bond dissociation energies of $X_2, Y_2$ and $XY$ are in the ratio of 1 : 0.5 : 1. $\Delta H$ for the formation of $XY$ is $-200\; kJ \;mol^{-1}$. The bond dissociation energy of $X_2$ will be :

asked Aug 21, 2018 by pady_1

1 answer

DNA fragments are

asked Aug 21, 2018 by pady_1

1 answer

Match the terms in Column-I with their description in Column-II and choose the correct option :

asked Aug 21, 2018 by pady_1

1 answer

In mammalian eye, the 'fovea' is the center of the visual field, where -

asked Aug 21, 2018 by pady_1

1 answer

Using the Gibbs change, $\Delta G^o = + 63.3 \;kJ$, for the following reaction, $Ag_2CO_3 (g) \leftrightharpoons 2 Ag^+ (aq) + CO^{2-}_3 (aq)$ the $K_{sp}$ of $Ag_2CO_3 (s)$ in water at $25^oC$ is ($R = 8.314 \; JK^{-1} mol^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

The number of carbon atoms per unit cell of diamond unit cell is -

asked Aug 20, 2018 by pady_1

1 answer

Limiting molar conductivity of $NH_4OH$ (i.e. $\Lambda^o_m (NH_4 OH))$ is equal to

asked Aug 20, 2018 by pady_1

2 answers

A buffer solution is prepared in which the concentration of $NH_3$ is 0.30 M and the concentration of $NH_4^+$ is 0.20 M. If the equilibrium constant, $K_b$ for $NH_3$ equals $1.8 × 10^{–5}$, what is the pH of this solution? ($\log 2.7 = 0.43$)

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following species does not exist under normal conditions?

asked Jul 26, 2018 by pady_1

1 answer

From the following bond energies : H â€“ H bond energy : 431.37 kJ $mol^{â€“1}$ C = C bond energy : 606.10 kJ $mol^{â€“1}$ C â€“ C bond energy : 336.49 kJ $mol^{â€“1}$ C â€“ H bond energy : 410.50 kJ $mol^{â€“1}$ Enthalpy for the reaction,

asked Jul 26, 2018 by pady_1

2 answers

If the concentration of $OH^-$ ions in the reaction, $Fe(OH)_3(S)\rightleftharpoons Fe^{3+}(aq.)+3OH^-(aq)$ is decreased by $1\frac{1}{4}$ times, then equilibrium concentration of $Fe^{3+ }$will increase by -

asked Jul 26, 2018 by pady_1

1 answer

The number of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic slution is :

asked Jul 26, 2018 by pady_1

1 answer

In a set of reactions propionic acid yielded a compound D. $CH_3CH_2COOH \xrightarrow{SOCl_2} B \xrightarrow{NH _3} C \xrightarrow[{ Br_2 }]{KOH} D$ The structure of D would be:-

asked Jul 25, 2018 by pady_1

0 answers

The aqueous solution containing which one of the following ions will be colourless -

asked Jul 24, 2018 by pady_1

1 answer

The correct statement in respect of protein haemoglobin is that it :-

asked Jul 24, 2018 by pady_1

1 answer

The oxidation states of sulphur in the anions $SO_3^{2–}, S_2O_4^{2–}$ and $S_2O_6^{2–}$ follow the order -

asked Jul 24, 2018 by pady_1

1 answer

1 M and 2.5 litre NaOH solution mixed with another 0.5 M and 3 litre NaOH solution. Then find out molarity of resultant solution : -

asked Jul 23, 2018 by pady_1

1 answer

An organic compound $A(C_4H_9Cl)$ on reaction with $Na$/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is :-

asked Jul 20, 2018 by pady_1

1 answer

First product of the reaction between RCHO and $NH_2$ $NH_2$ : -

asked Jul 20, 2018 by pady_1

1 answer

asked Jun 15, 2018 by priyanka.c

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Ram, Archana, Akshiti and George are playing cards. Ram and Archana are partners. if Archana is facing west, and Akshiti is sitting on left hand side of Archana. George is facing which direction ?

asked Dec 31, 2015 by pady_1

1 answer

A number of times a particular number occurs is called

asked Dec 31, 2015 by pady_1

0 answers

Find the volume of a cube of side 15 m.

asked Dec 31, 2015 by pady_1

1 answer

Shweta ate $\large\frac{3}{11}$ of a pizza and her friend George ate $\large\frac{13}{22}$ of the pizza. How much total pizza did they eat altogether?

asked Dec 31, 2015 by pady_1

0 answers

Find two consecutive whole numbers such that $\large\frac{4}{7}$ of the larger exceeds $\large\frac{1}{2}$ of the smaller by 5.

asked Dec 31, 2015 by pady_1

1 answer

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