Recent questions tagged 54

The displacement of a particle executing simple harmonic motion is given by $y = A0 + Asin{\omega}{t}+ Bcos\omega{t}$. Then the amplitude of its oscillation is given by :

asked Jul 8, 2019 by pady_1

1 answer

Which of the following species has the highest ionization potential ?

asked Dec 19, 2018 by pady_1

0 answers

Aqueous solution of carnallite gives positive test for :

asked Dec 19, 2018 by pady_1

0 answers

The r.m.s velocity of an ideal gas at $300\; K$ is $12240\; cm/sec$. What is the most probable velocity at that temperature ?

asked Dec 19, 2018 by pady_1

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The electronic configuration of elements A, B and C are $[He]2s^1, [Ne] 3s^1 $ and $[Ar] 4s^1$ respectively, which one of the following order is correct for the first ionization potentials (in $k.J.\; mol^{-1}$) of A, B and C ?

asked Dec 11, 2018 by pady_1

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At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at $47^{\circ}C$ ?

asked Dec 11, 2018 by pady_1

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During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $C_P/C_V$ for the gas is :

asked Dec 11, 2018 by pady_1

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Let $y = y(x)$ be the solution of the differential equation $\sin x \frac{dy}{dx} + y \cos x = 4 x, \; x \subset (0, \pi)$. If $y (\frac{\pi}{2})=0$, then $y (\frac{\pi}{6})$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

An observer is moving with half the speed of light towards stationary microwave source emitting waves at frequency $10\;GHz$. What is the frequency of the microwave measured by the observer ? (speed of light = $3 \times 10^8\;ms^{–1}$ )

asked Dec 11, 2018 by pady_1

0 answers

2-chloro-2-methylpentane on reaction with sodium methoxide in methanol yields :

asked Dec 11, 2018 by pady_1

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A compound $A$ with molecular formula $C_{10}H_{13}Cl$ gives a white precipitate on adding silver nitrate solution. $A$ on reacting with alcoholic KOH gives compound $B$ as the main product. $B$ on ozonolysis gives $C$ and $D$. $C$ gives Cannizaro reaction but not aldol condensation. $D$ gives aldol condensation but not Cannizaro reaction. $A$ is :

asked Dec 11, 2018 by pady_1

0 answers

If $X = \{4^n - 3n - 1 : n \in N\}$ and $Y = \{9(n - 1) : n \in N\}$, where $N$ is the set of natural numbers, then $X \cup Y$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

Let A and B be two sets containing 2 elements and 4 elements respectively. The number of subsets of $A \times B$ having 3 or more elements is

asked Dec 11, 2018 by pady_1

1 answer

Two cars of masses $m_1$ and $m_2$ are moving in circles of radii $r_1$ and $r_2$, respectively. Their speeds are such that they make complete circles in the same times t. The ratio of their centripetal acceleration is

asked Dec 11, 2018 by pady_1

0 answers

If the mean deviation about the medium of the numbers a, 2a, . . . ., 50a is 50, then |a| equals

asked Dec 11, 2018 by pady_1

0 answers

Two fixed frictionless inclined plane making an angle $30^{\circ}$ and $60^{\circ}$ with the vertical are shown in the figure. Two block A and B are placed on the two planes. What is the relative vertical acceleration of A with respect to B ?

asked Dec 11, 2018 by pady_1

0 answers

The IUPAC name of neopentane is

asked Nov 29, 2018 by pady_1

0 answers

Standard entropy of $X_2, Y_2$ and $XY_3$ are 60, 40 and 50 $JK^{-1}mol^{-1}$, respectively. For the reaction,$\frac{1}{2}X_2+\frac{3}{2}Y_2\rightarrow XY_3,\Delta H=-30KJ$, to be at equilibrium, the temperature will be

asked Nov 29, 2018 by pady_1

0 answers

A point mass oscillates along the $x$-axis according to the law $x=x_0 \cos (\omega t - \pi/4)$. If the acceleration of the particle is written as : $a = A \cos (\omega t + \delta)$, then :

asked Nov 29, 2018 by pady_1

0 answers

The rms value of the electric field of the light coming from the Sun is 720 N/C. The average total energy density of the electromagnetic wave is :

asked Nov 13, 2018 by pady_1

0 answers

If the angle $\theta$ between the line $\frac{x+1}{1} = \frac{y-1}{2} = \frac{z-2}{2}$ and the plane $ 2x - y + \sqrt{\lambda} z+4 = 0$ is such that $\sin \theta = \frac{1}{3}$. The value of $\lambda$ is :

asked Nov 5, 2018 by pady_1

0 answers

Two thin, long, parallel wires, separated by a distance $d$ carry $a$ current of $i$ $A$ in the same direction. They will :

asked Nov 5, 2018 by pady_1

0 answers

The eccentricity of an ellipse, with its centre at the origin, is $\frac{1}{2}$. If one of the directrices is $x=4$, then the equation of the ellipse is

asked Nov 5, 2018 by pady_1

0 answers

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

asked Aug 21, 2018 by pady_1

1 answer

GnRH, a hypothalamic hormone, needed in reproduction, acts on

asked Aug 21, 2018 by pady_1

1 answer

A typical fat molecule is made up of -

asked Aug 21, 2018 by pady_1

1 answer

In which of the following both pairs have correct combination? OPTION :

asked Aug 21, 2018 by pady_1

1 answer

When 0.1 mol $MnO_4^{2-}$ is oxidised the quantity of electricity required to completely $MnO_4^{2-}$ to $MnO_4^-$ is -

asked Aug 20, 2018 by pady_1

1 answer

How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M $HNO_3$ ? The concentrated acid is 70 % $HNO_3$.

asked Aug 20, 2018 by pady_1

1 answer

In a reaction, $A + B \rightarrow Product $, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as

asked Aug 20, 2018 by pady_1

1 answer

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled ?

asked Aug 16, 2018 by pady_1

1 answer

Which one of the following does not exhibit the phenomenon of mutarotation?

asked Jul 26, 2018 by pady_1

1 answer

Which of the following is not permissible arrangement of electrons in an atom ?

asked Jul 26, 2018 by pady_1

1 answer

The bromination of acetone that occurs in acid solution is represented by this equation. $CH_3COCH_3(aq.)+Br_2(aq.)\longrightarrow CH_3COCH_2Br(aq)+H^+(aq)+Br^-(aq.)$ These kinetic data were obtained from given reaction concentrations. Initial rate, disappearance of $Br_2, Ms^{-1}$ $5.7 \times 10^{-5}$ $5.7 \times 10^{-5}$ $1.2 \times 10^{-4}$ $3.1 \times 10^{-4}$ Based on these data, the rate equation is :

asked Jul 26, 2018 by pady_1

1 answer

Consider the following sets of quantum number : Which of the following sets of quantum number is not possible :

asked Jul 26, 2018 by pady_1

1 answer

Assume each reaction is carried out in an open container. For which reaction will $\Delta H =\Delta E$

asked Jul 25, 2018 by pady_1

0 answers

Which one of the following forms micelles in aqueous solution above certain concentration -

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following is a chain growth polymer :-

asked Jul 24, 2018 by pady_1

1 answer

Which of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms :

asked Jul 24, 2018 by pady_1

1 answer

Solubility of $MX_2$ – type electrolytes is $0.5 \times 10^{–4}$ Mole/lit. then find out $K_{sp}$ of elctrolytes : -

asked Jul 23, 2018 by pady_1

1 answer

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asked Jul 20, 2018 by pady_1

1 answer

asked Jul 20, 2018 by pady_1

0 answers

Which of the following does not given iodoform test :

asked Jun 15, 2018 by pady_1

1 answer

A coin is tossed two times the probability of getting one head is

asked Dec 31, 2015 by pady_1

1 answer

A square painting has a perimeter of 8 metres. How long is each side of the painting?

asked Dec 31, 2015 by pady_1

0 answers

Maddy reads three-fifth of 75 pages of his lesson. How many more pages he need to complete the lesson?

asked Dec 31, 2015 by pady_1

1 answer

When 16 is added to 20\% of a number, it gives the number itself. The number is

asked Dec 31, 2015 by pady_1

1 answer

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