Recent questions tagged 59

The unit of thermal conductivity is

asked Jul 8, 2019 by pady_1

1 answer

Liquid benzene burns in oxygen according to $2C_6H_{6(l)} + 15O_{2(g)} \to 12CO_{2(g)} + 6H_2O_{(g)}$ How much litres of oxygen are required for complete combustion of $39\;g$ of liquid $C_6H_6$ ?

asked Dec 19, 2018 by pady_1

0 answers

Inorganic benzene contains :

asked Dec 19, 2018 by pady_1

0 answers

What is the oxidation state of chlorine in hypoclorous acid ?

asked Dec 19, 2018 by pady_1

0 answers

Ionic radius (in $\mathring{A}$) of $As^{3+}, \; Sb^{3+}$ and $Bi^{3+}$ follow the order :

asked Dec 11, 2018 by pady_1

0 answers

Moment of inertia of a circular wire of mass M and radius R about its diameter is :

asked Dec 11, 2018 by pady_1

0 answers

A tuning fork of known frequency 256 Hz makes 5 beats/s with the vibrating string of a piano. The beat frequency decreases to 2 beats/s when the tension in the piano string is slightly increased. The frequency of the piano string before increaseing the tension was :

asked Dec 11, 2018 by pady_1

0 answers

Let A be the sum of the first 20 terms and B be sum of the first 40 terms of the series $1^2 + 2.2^2 + 3^2 + 2.4^2 + 5^2+2.6^2 + ...$ If $B - 2A = 100 \lambda$, then $\lambda$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

A diverging lens with magnitude of focal length 25cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following is an anionic detergent ?

asked Dec 11, 2018 by pady_1

1 answer

is used as :

asked Dec 11, 2018 by pady_1

0 answers

The slope of the line touching both the parabolas $y^2 = 4x$ and $x^2 = -32y$ is

asked Dec 11, 2018 by pady_1

1 answer

Distance between two parallel planes $2x + y + 2z = 8$ and $4x + 2y + 4z + 5 = 0$ is

asked Dec 11, 2018 by pady_1

1 answer

This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements. An insulating solid sphere of radius R has a uniformly positive charge density $\rho$. As a result of this uniform charge distribution there is a finite value of electric potential at the centre of the sphere, at the surface of the sphere and also at a point out side the sphere. The electric potential at infinity is zero. Statement 1 : When a charge q is taken from the centre to the surface of the sphere, its potential energy changes by $\frac{qp}{3 \varepsilon_0}$ Statement 2 : The electric field at a distance r (r < R) from the centre of the sphere is $\frac{\rho r}{ 3 \varepsilon_0}$

asked Dec 11, 2018 by pady_1

0 answers

The area of the region enclosed by the curves $ y = x,\; \; x = e, \; \; y = \frac{1}{x}$ are the positive x-axis is

asked Dec 11, 2018 by pady_1

0 answers

A small particleof mass m is projected at an angle $\theta$ with the x-axis with a initial velocity $v_0$ in the x-yplane as shown in the figure. At a time $t < \frac{v_0 \sin \theta}{g}$, the angular momentum of the particle is where $\hat{i}, \hat{j} $ and $\hat{k}$ are unit vectors along $x, \; y$ and $z-axis$ respectively.

asked Dec 11, 2018 by pady_1

0 answers

Which of the following pairs represents linkage isomers ?

asked Nov 29, 2018 by pady_1

0 answers

Which one of the following is the correct statement?

asked Nov 29, 2018 by pady_1

0 answers

A charged particle with charge q enters a region of constant, uniform and mutually orthogonal fields $\overrightarrow{E}$ and $\overrightarrow{B}$ with a velocity $\overrightarrow{v}$ perpendicular to both $\overrightarrow{E}$ and $\overrightarrow{B}$, and comes out without any change in magnitude or direction of $\overrightarrow{v}$. Then :

asked Nov 29, 2018 by pady_1

0 answers

How many moles of magnesium phosphate, $Mg_3 (PO_4)_2$ will contain 0.25 mole of oxygen atoms ?

asked Nov 13, 2018 by pady_1

0 answers

Two points $A$ and $B$ move from rest along a straight line with constant acceleration $f$ and $f'$ respectively. If $A$ takes $m$ sec more than $B$ and describes $'n'$ unit more than $B$ in acquiring the same speed, then :

asked Nov 5, 2018 by pady_1

0 answers

A parallel plate capacitor is made by stacking n equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C, then the resultant capacitance is :

asked Nov 5, 2018 by pady_1

0 answers

The intersection of the spheres $x^2+y^2+z^2+7x-2y-z=13$ and $x^2+y^2+z^2 -3x+3y+4z=8$ is the same as the intersection of one of the sphere and the plane

asked Nov 5, 2018 by pady_1

0 answers

Which one of the following conditions will favour maximum formation of the product in the reaction, $A_2 (g) + B_2 (g) \rightleftharpoons X_2 (g) \Delta_f H = - X\;kJ$ ?

asked Aug 21, 2018 by pady_1

2 answers

Which of the following are not polymeric ?

asked Aug 21, 2018 by pady_1

1 answer

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is contaning more number of chromosomes as compared to other dividing cells. This would results in -

asked Aug 21, 2018 by pady_1

1 answer

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind?

asked Aug 21, 2018 by pady_1

1 answer

For the reaction : $X_2O_4 (l) \to 2XO_2 (g)$ $\Delta U = 2.1 \; k \; cal, \; \Delta s = 20 \; cal \; K^{-1} $ at $300 K$

asked Aug 20, 2018 by pady_1

1 answer

A magnetic moment of 1.73 BM will be shown by one among the following -

asked Aug 20, 2018 by pady_1

1 answer

pH of a saturated solution of $Ba(OH)_2 $ is 12. The value of solubility product $(K_{SP}) of Ba(OH)_2$ is

asked Aug 20, 2018 by pady_1

2 answers

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process ?

asked Aug 16, 2018 by pady_1

1 answer

The reaction of toluene with $Cl_2$ in presence of $FeCl_3$ gives 'X' and reaction in presence of light gives 'Y'. Thus, 'X' and 'Y' are

asked Jul 26, 2018 by pady_1

1 answer

The energy absorbed by each molecule $ (A_2) $of a substance is $ 4.4 × 10^{–19 }J $ and bond energy per molecule is $ 4.0 × 10^{–19 }J $. The kinetic energy of the molecule per atom will be :

asked Jul 26, 2018 by pady_1

1 answer

In DNA, the complementary bases are -

asked Jul 26, 2018 by pady_1

1 answer

The equilibrium constant of the reaction : $Cu(s) + 2Ag^+(aq) \to Cu^{2+}(aq) +2Ag(s); $ $E^o = 0.46V$ at 298 K is :

asked Jul 26, 2018 by pady_1

1 answer

More number of oxidation states are exhibited by the actinoids than by the lanthonoids. The main reason for this is:-

asked Jul 25, 2018 by pady_1

1 answer

Equilibrium constants $K_1$ and $K_2$ for the following equilibria : $NO(g)+\frac{1}{2}O_2 {\stackrel{k_1}{\rightleftharpoons}} NO_2(g)$ and $2NO_2 (g) {\stackrel{k_2}{\rightleftharpoons}} 2NO (g) + O_2 (g) $ are related as -

asked Jul 24, 2018 by pady_1

1 answer

If the bond energies of H–H, Br – Br and H –Br are 433, 192 and $-364\; kJ\; mol ^{–1}$ respectively the $\Delta H^o$ for the reaction $H_2(g)+Br_2(g)\to 2HBr(g)$ is-

asked Jul 24, 2018 by pady_1

2 answers

The densities of graphite and diamond at $298 K$ are $2.25$ and $3.31 g\; cm^{–3}$, respectively. If the standard free energy difference ($\Delta G^o$) is equal to $1895 J \;mol^{–1}$, the pressure at which graphite will be transformed into diamond at $298 K$ is -

asked Jul 24, 2018 by pady_1

2 answers

Unit of entropy is : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is correct : -

asked Jul 20, 2018 by pady_1

1 answer

$\alpha-D-glucose$ and $\beta-D-glucose$ are :

asked Jul 20, 2018 by pady_1

1 answer

Percentage of C, H & N are given as follows : C = 40% H = 13.33% N = 46.67% The empirical formula will be :

asked Jun 15, 2018 by pady_1

1 answer

Architect : Building :: Sculptor : ?

asked Dec 31, 2015 by pady_1

1 answer

9 of the people in Yoshi's neighbourhood like to eat yoghurt. 9 people like to eat pancakes, and 4 people like to eat both yoghurt and pancakes. How many people like to eat pancakes but not yoghurt?

asked Dec 31, 2015 by pady_1

1 answer

Find the volume of a cuboid of dimensions 12 m × 14 m × 3.5 m.

asked Dec 31, 2015 by pady_1

1 answer

Sachin is reading a book titled 'History of China', and this book has 135 pages. Sachin manages to read $\large\frac{1}{15}$ of the book every day. After 3 days, how many pages has he read?

asked Dec 31, 2015 by pady_1

0 answers

Usha donated 30\% of his salary to charity and spent 20\% of the remaining amount. She still has Rs.5600 left. What was her total salary?

asked Dec 31, 2015 by pady_1

0 answers

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