Recent questions tagged 52

The speed of a swimmer in still water is $20\frac{ m}{s}$. The speed of river water is $10 \frac{m}{s}$ and is flowing due east. If he is standing on the south bank and wishes to cross the river along the shortest path, the angle at which he should make his strokes w.r.t. north is given by :

asked Jul 8, 2019 by pady_1

1 answer

The radius of the nucleus is related to the mass number A by :

asked Dec 19, 2018 by pady_1

0 answers

The industrial preparation of nitric acid by Ostwald's process involves :

asked Dec 19, 2018 by pady_1

0 answers

A non-volatile solute (A) is dissolved in a volatile solvent (B). The vapour pressure of the resultant solution is $P_S$. The vapour pressure of pure solvent is $P_B$. If $X_B$ is the mole fraction of the solvent which of the following is correct :

asked Dec 19, 2018 by pady_1

0 answers

In which of the following reactions, $H_2O_2$ acts as a reducing reagents ?

asked Dec 11, 2018 by pady_1

0 answers

A lift is moving down with acceleration $a$. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively :

asked Dec 11, 2018 by pady_1

0 answers

The work done in placing a charge of $8 \times 10^{-18} C$ on a condenser of capacity $100 \mu F$ is :

asked Dec 11, 2018 by pady_1

0 answers

The integral $\begin{align} \int \frac{\sin^2 x \cos^2 x}{(\sin^5 x + \cos^3 x \sin^2 x + \sin^3 x \cos^2x + \cos^5x)^2} \end{align} \; dx$ is equal to: (where C is a constant of integration)

asked Dec 11, 2018 by pady_1

1 answer

Which of the following statements is false ?

asked Dec 11, 2018 by pady_1

0 answers

The product of the reaction given below is :

asked Dec 11, 2018 by pady_1

0 answers

The optically inactive compound from the following is :

asked Dec 11, 2018 by pady_1

1 answer

Let PS be the median of the triangle with vertices $P(2, 2), Q(6, -1)$ and $R(7, 3)$. The equation of the line passing through $(1, -1)$ and parallel to PS is

asked Dec 11, 2018 by pady_1

1 answer

If $y = \sec(\tan^{-1}x)$, then $\frac{dy}{dx} $ at $x=1$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be

asked Dec 11, 2018 by pady_1

0 answers

Consider the following statements P : Suman is brilliant Q : Suman is rich R : Suman is honest The negative of the statement "Suman is brilliant and dishonest if and only if Suman is rich" can be expressed as

asked Dec 11, 2018 by pady_1

0 answers

Two conductors have the same resistance at $0^{\circ}C$ but their temperature coefficients of resistance are $\alpha_1$ and $\alpha_2$. The respective temperature coefficients of their series and parallel combinations are nearly

asked Dec 11, 2018 by pady_1

0 answers

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution ?

asked Nov 29, 2018 by pady_1

0 answers

The electrophile, $E^\oplus$ attacks the benzene ring to generate the intermediate $\sigma$-complex. Of the following, which $\sigma$-complex is of lowest energy?

asked Nov 29, 2018 by pady_1

0 answers

The velocity of a particle is $\nu = \nu_{_0} + gt = ft^2$. If its position is $x=0$ at $t=0$, then its displacement after unit time $(t=1)$ is :

asked Nov 29, 2018 by pady_1

0 answers

The work of 146 kJ is performed in order of compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by $7^{\circ}C$. The gas is : ($R = 8.3 \; J\; mol^{-1} K^{-1}$)

asked Nov 13, 2018 by pady_1

0 answers

An ellipse has OB as semi minor axis, $F$ and $F'$ its foci and th angle $FBF'$ is a right angle. Then the eccentricity of the ellipse is :

asked Nov 5, 2018 by pady_1

0 answers

One conducting U-tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed $\nu$, then the emf induced in the circuit in terms of $B, l$ and $\nu$, where $l$ is the width of each tube, will be :

asked Nov 5, 2018 by pady_1

1 answer

The intercept on the line $y=x$ by the circle $x^2 + y^2 -2x=0$ is AB. Equation of the circle on AB as a diameter is

asked Nov 5, 2018 by pady_1

0 answers

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

asked Aug 21, 2018 by pady_1

1 answer

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

asked Aug 21, 2018 by pady_1

1 answer

Which of the following approaches does not give the defined action of contraceptive ?

asked Aug 21, 2018 by pady_1

1 answer

The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements is involved in this reaction?

asked Aug 21, 2018 by pady_1

1 answer

Of the following 0.1 M aqueous solutions, which one will exhibit the largest freezing point depression ?

asked Aug 20, 2018 by pady_1

1 answer

Based on equation $E = -2.178 \times 10^{-18} J (\frac{Z^2}{n^2})$, certain conclucsions are written. Which of them is not correct ?

asked Aug 20, 2018 by pady_1

1 answer

Which one of the following pairs is isostructural (i.e. having the same shape and hybridization) ?

asked Aug 20, 2018 by pady_1

1 answer

The electrode potentials for $Cu^{2+}_{(aq)} + e^- \to Cu^+_{(aq)} $ and $Cu^+ _{(aq)} + e^- \to Cu_{(s)}$ are + 0.15 V and + 0.50 V respectively. The value of $E^o _{Cu^{2+}/Cu}$ will be :

asked Aug 16, 2018 by pady_1

1 answer

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

asked Jul 26, 2018 by pady_1

1 answer

Oxidation number of P in $PO_{4}^{3-}$, of S in $SO_{4}^{2-}$and that of Cr in $Cr_{2}O_{7}^{2-}$ are respectively :

asked Jul 26, 2018 by pady_1

1 answer

If a gas expands at constant temperature, it indicates that :

asked Jul 26, 2018 by pady_1

1 answer

An element, X has the following isotopic composition; $^{200}X : 90 \%$ $^{199}X : 8.0 \%$ $^{202}X : 2.0 \%$ The weighted average atomic mass of the naturally - occurring element X is closest to :

asked Jul 26, 2018 by pady_1

1 answer

A solution containing 10 g per dm 3 of urea (molecular mass = $60g mol^{-1}$) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solution is:

asked Jul 25, 2018 by pady_1

0 answers

Which one of the following oxides is expected to exhibit paramagnetic behaviour -

asked Jul 24, 2018 by pady_1

1 answer

Which of the following forms cationic micelles above certain concentration :-

asked Jul 24, 2018 by pady_1

1 answer

Which one of the following compounds is not a protonic acid :

asked Jul 24, 2018 by pady_1

2 answers

In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom : -

asked Jul 23, 2018 by pady_1

1 answer

asked Jul 20, 2018 by pady_1

1 answer

Ethyl benzoate can be prepared from benzoic acid by using :

asked Jul 20, 2018 by pady_1

1 answer

Aspirin can be prepared by the reaction of acetyl chloride with :

asked Jun 15, 2018 by pady_1

1 answer

Which of these division problems has an answer of 8?

asked Dec 31, 2015 by pady_1

1 answer

The difference between the maximum and the minimum values of an observation is

asked Dec 31, 2015 by pady_1

1 answer

A square piece of tissue paper has a perimeter of 112 centimetres. How long is each side of the tissue paper?

asked Dec 31, 2015 by pady_1

0 answers

One half of the students in a school are girls, $\large\frac{3}{5}$ of these girls are studying in lower classes. What fraction of girls are studying in lower classes?

asked Dec 31, 2015 by pady_1

1 answer

A 3-pack of tickets to the zoo costs Rs1,473.00. What is the unit price?

asked Dec 31, 2015 by pady_1

1 answer

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