Recent questions tagged 71

A force $F = 20 + 10y$ acts on a particle in y-direction where F is in newton and y in meter. Work done by this force to move the particle from $y = 0$ to $y = 1;m$ is :

asked Jul 8, 2019 by pady_1

1 answer

$75\%$ of first order reaction is completed in 32 minutes $50 \%$ of the reaction would have been completed in :

asked Dec 19, 2018 by pady_1

0 answers

Which of the following pairs of ions contain the same number of unpaired electrons ?

asked Dec 19, 2018 by pady_1

0 answers

Which of the following react with water to give ethane ?

asked Dec 19, 2018 by pady_1

0 answers

Ethanol, when reacted with $PCl_5$ gave $A$, $POCl_3$ and $HCl$. A reacts with silver nitrate to form $B$ ( major product) and $AgCl$. $A$ and $B$ are respectively :

asked Dec 11, 2018 by pady_1

0 answers

Wires 1 and 2 carrying currents $i_1$ and $i_2$ respectively are inclined at an angle $\theta$ to each other. What is the force on a small element $dl$ of wire 2 at a distance $r$ from wire 1 (as shown in figure) due to the magnetic field of wire 1 ?

asked Dec 11, 2018 by pady_1

1 answer

The image formed by an objective of a compound microscope is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following lines correctly show the temperature dependence of equilibrium constant $K$, for an exothermic reaction ?

asked Dec 11, 2018 by pady_1

0 answers

The major product obtained in the following reaction is :

asked Dec 11, 2018 by pady_1

0 answers

For $x \in R, \; f(x) = | \log 2 - \sin x | $ and $g(x) = f( f(x))$, then :

asked Dec 11, 2018 by pady_1

1 answer

The distance, from the origin of the normal to the curve, $x = 2 \cos t + 2 t \sin t,\; y = 2\sin t - 2t \cos t$ at $ t = \frac{\pi}{4}$, is:

asked Dec 11, 2018 by pady_1

1 answer

The equivalent conductance of NaCl at concentration C and at infinite dilution are $\lambda_C$ and $\lambda_{\infty}$, respectively. The correct relationship between $\lambda_C$ and $\lambda_{\infty}$ is given as: (where the constant B is positive)

asked Dec 11, 2018 by pady_1

0 answers

Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface tension is T, density of liquid is $\rho$ and $L$ is its latent heat of vaporization.

asked Dec 11, 2018 by pady_1

0 answers

According toFreundiich adsorption isotherm, which of the following is correct ?

asked Dec 11, 2018 by pady_1

0 answers

Which of the following facts about the complex $[Cr (NH_3)_6] Cl_3$ is wrong ?

asked Dec 11, 2018 by pady_1

0 answers

The number of $3 \times 3$ non-singular matrices, with four entries as 1 and all other entries as 0, is

asked Dec 11, 2018 by pady_1

0 answers

For real $x$, let $f(x) = x^3 + 5x + 1$, then

asked Nov 29, 2018 by pady_1

0 answers

Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see in figure) Electrons accelerated by potential V are diffracted from a crystal. If d = 1Ã… and $i = 30^o$, V should be about $(h = 6.6 \times 10^{-34} Js$, $m_e = 9.1 \times 10^{-31} kg, e = 1.6 \times 10^{-19} C)$

asked Nov 29, 2018 by pady_1

0 answers

If $g_{_E}$ and $g_{_M}$ are the accelerations due to gravity on the surfaces of the earth and the moon respectively and if Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio $\frac{electronic \;charge \;on \;the \;moon}{electronic \;charge \;on \;the \;earth} $to be :

asked Nov 29, 2018 by pady_1

0 answers

Among the following the one that gives positive iodoform test upon reaction with $I_2$ and $NaOH$ is :

asked Nov 13, 2018 by pady_1

0 answers

A real valued function $f(x)$ satisfies the functional equation $f(x-y) = f(x) f(y) - f(a-x) f(a+y)$ where $a$ is a given constant and $f(0) = 1, f(2a - x)$ is equal to :

asked Nov 5, 2018 by pady_1

0 answers

The uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then :

asked Nov 5, 2018 by pady_1

0 answers

In a right angle $\Delta ABC, \; \angle{A}=90^{\circ}$ and sides a, b, c respectively, 5 cm, 4 cm and 3 cm. If a force $\overrightarrow{F}$ has moments 0, 9 and 16 in N cm units respectively about vertices A, B and C, then magnitude of $\overrightarrow{F}$ is

asked Nov 5, 2018 by pady_1

0 answers

Which of the following statements is not true for halogen ?

asked Aug 21, 2018 by pady_1

1 answer

Viroids differ from viruses in having

asked Aug 21, 2018 by pady_1

1 answer

Stems modified into flat green organs performing the functions of leaves are known as

asked Aug 21, 2018 by pady_1

1 answer

The species confined to a particular region and not found elsewhere is termed as -

asked Aug 21, 2018 by pady_1

1 answer

The reaction of aqueous $KMnO_4$ with $H_2O_2$ in acidic conditions gives :

asked Aug 20, 2018 by pady_1

1 answer

Which of these is least likely to act as a Lewis base ?

asked Aug 20, 2018 by pady_1

1 answer

In which of the following compounds, nitrogen exhibits highest oxidation state ?

asked Aug 20, 2018 by pady_1

1 answer

Which of the following compounds has the lowest melting point ?

asked Aug 16, 2018 by pady_1

1 answer

A solution of sucrose (molar mass = 342 g $mol^-1$ ) has been prepared by dissolving 68.5 g of sucrose in 1000 g of water. The freezing point of the solution obtained will be : ($K_f$ for water = 1.86 K kg mol –1)

asked Jul 26, 2018 by pady_1

0 answers

According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order :

asked Jul 26, 2018 by pady_1

1 answer

Acetophenone when reacted with a base, $C_2 H_5ONa$, yields a stable compound which has the structure :

asked Jul 26, 2018 by pady_1

0 answers

The correct order of C-O bond length among $CO, CO^{2-}_3, CO_2$ is :

asked Jul 26, 2018 by pady_1

2 answers

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of $\alpha$ hydroxy acid. The carbonyl compound is:

asked Jul 25, 2018 by pady_1

1 answer

The number of moles of $KMnO_4$ reduced by one mole of KI in alkaline medium is :-

asked Jul 24, 2018 by pady_1

1 answer

$H_2O$ is dipolar, whereas $BeF_2$ is not. It is because:-

asked Jul 24, 2018 by pady_1

1 answer

The molar heat capacity of water at constant pressure, C, is $75 \;JK^{–1} mol^{–1}$. When 1.0 KJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is :

asked Jul 24, 2018 by pady_1

1 answer

Which of the following order is wrong : -

asked Jul 23, 2018 by pady_1

1 answer

For the reaction $2N_2O_5 \to 4NO_2 + O_2$ rate and rate constant are $1.02 \times 10^{–4}$ and $3.4 \times 10^{–5} sec^{–1}$ respectively.Then concentration of $N_2O_5 $ at that time will be : -

asked Jul 20, 2018 by pady_1

1 answer

In quantitative analysis of second group in lab. $H_2S$ gas is passed in acidic medium for ppt. When $Cu^{+2}$ and $Cd^{+2}$ react with KCN, than in which of the following condition, ppt will not be formed due to relative stability :

asked Jul 20, 2018 by pady_1

1 answer

$A + B \rightleftharpoons C + D Constant = K_{1}$ $E + F \rightleftharpoons G + H Constant = K_{2}$ then $C + D + E + F \Rightarrow$ product. The constant of reaction will be :

asked Jun 15, 2018 by pady_1

1 answer

HARDWARE : SOFTWARE ::

asked Dec 31, 2015 by pady_1

1 answer

, The bar graph shows the favorite colors of 20 students in a class. How many more of them favored orange than those who favored green?

asked Dec 31, 2015 by pady_1

1 answer

Two diagonals of a rhombus are 72 cm and 30 cm respectively. What is its perimeter?

asked Dec 31, 2015 by pady_1

0 answers

Fifty divided by half minus forty. What is the answer?

asked Dec 31, 2015 by pady_1

1 answer

A bread company makes 5 types of bread. A restaurant chain ordered 543 loaves of each kind of bread. How many loaves of bread in total did the restaurant chain order?

asked Dec 31, 2015 by pady_1

0 answers

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