Recent questions tagged 36

A parallel plate condenser with oil between the plates (dielectric constant of oil $K=2$) has a capacitance $C$. If the oil is removed, the capacitance of the capacitor becomes :

asked Dec 19, 2018 by pady_1

0 answers

The temperature at which a ferromagnetic material becomes paramagnetic is called :

asked Dec 19, 2018 by pady_1

0 answers

A body of mass $1 \; kg$ is executing simple harmonic motion. Its displacement $y\;cm$ at $t\;sec$ is given by $y = 6 \sin (100 t + \frac{\pi}{4})$ its maximum kinetic energy is :

asked Dec 19, 2018 by pady_1

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A body of mass $6 \;kg$ is under a force which causes displacement in it given by $'' s = \frac{t^2}{4}''$ metres where $'t'$ is time. The work done by the force in 2 seconds is :

asked Dec 11, 2018 by pady_1

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Which statement is incorrect ?

asked Dec 11, 2018 by pady_1

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"Heat cannot be itself from a body at lower temperature to a body at higher temperature" is a statement or consequence of :

asked Dec 11, 2018 by pady_1

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If the system of linear equations $x+ ky + 3z=0$ $3x + ky - 2z=0$ $2x + 4y - 3z =0 $ has a non-zero solution $(x, y, z)$, then $\frac{xz}{y^2}$ is equal to :

asked Dec 11, 2018 by pady_1

1 answer

$C_p$ and $C_v$ are specific heats at constant pressure and constant volume respectively. It is observed that $C_p - C_v$ = a for hydrogen gas $ C_p - C_v$ = b for nitrogen gas The correct relation between a and b is :

asked Dec 11, 2018 by pady_1

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$18\; g$ glucose $(C_6H_{12}O_6 )$ is added to $178.2\; g$ water. The vapor pressure of water (in torr) for this aqueous solution is :

asked Dec 11, 2018 by pady_1

0 answers

A solution at $20^{\circ}C$ is composed of $1.5\; mol$ of benzene and $3.5\; mol$ of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are $74.7\; torr$ and $22.3\; torr$, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively :

asked Dec 11, 2018 by pady_1

0 answers

A bird is sitting on the top of a vertical pole $20\; m$ high and its elevation from a point O on the ground is $45^{\circ}$. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to $30^{\circ}$. Then the speed (in m/s) of the bird is

asked Dec 11, 2018 by pady_1

1 answer

If $x, y, z$ are in A.P and $\tan^{-1}x. \tan^{-1}y$ and $\tan^{-1}z$ are also in A.P., then

asked Dec 11, 2018 by pady_1

1 answer

Hydrogen atom is excited from ground state to another state with pricipal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be

asked Dec 11, 2018 by pady_1

0 answers

$\frac{d^2x}{dy^2}$ equals

asked Dec 11, 2018 by pady_1

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A particle is moving with velocity $v = K(y \hat i + x \hat j) $, where K is a constant. The general equation for its path is

asked Dec 11, 2018 by pady_1

0 answers

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :

asked Nov 29, 2018 by pady_1

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The organic chloro compound, which shows complete stereochemical inversion during a $S_N2$ reaction is

asked Nov 29, 2018 by pady_1

0 answers

The function $f : R / \{0\} \to R$ given by $ f(x) = \frac{1}{x} - \frac{2}{e^{2x} -1}$ can be made continuous at $x=0$ by defining $f(0)$ as :

asked Nov 29, 2018 by pady_1

0 answers

A long solenoid has 200 turns per cm and carries a current $i$. The magetic field at its centre is $6.28 \times 10^{-2}weber/m^2$. Another long solenoid has 100 turns per cm and it carries a current $i/3$. The value of the magnetic field at its current is :

asked Nov 13, 2018 by pady_1

0 answers

The line parallel to the $x-axis$ and passing through the intersection of the lines $ax+2by+3b =0$ and $bx-2ay - 3a = 0$, where $(a,b) \neq (0,0)$ is :

asked Nov 5, 2018 by pady_1

0 answers

The function $\sin^2( \omega t)$ represents :

asked Nov 5, 2018 by pady_1

0 answers

If $\begin{align} \int \frac{\sin x}{\sin(x-\alpha)} dx = Ax + B \log \sin (x-\alpha) + C \end{align}$, then value of $(A, B)$ is

asked Nov 5, 2018 by pady_1

0 answers

A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be

asked Aug 21, 2018 by pady_1

2 answers

For a given reaction, $\Delta H = 35.5\; KJ\; mol^{-1}$ and $\Delta S = 83.6 \; JK^{-1} mol^{-1}$. The reaction is spontaneous at : (Assume that $\Delta H$ and $\Delta S$ do not vary with temperature)

asked Aug 21, 2018 by pady_1

1 answer

The product formed by the reaction of an aldehyde with a primary amine is :

asked Aug 21, 2018 by pady_1

1 answer

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed ?

asked Aug 21, 2018 by pady_1

1 answer

In the Young's double slit experiment the intensity of light at a point on the screen where the path difference is $\lambda$ is K, ($\lambda$ being the wave length of light used). The intensity at a point where the path difference is $\lambda/4$, will be :

asked Aug 20, 2018 by pady_1

1 answer

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is – (Given 1 u = 931 MeV)

asked Aug 20, 2018 by pady_1

1 answer

A ray of light is incident at an angle of incidence, i, on one face of a prism of angle A (assumed to be small) and emerges normally from the opposite face. It the refractive index of the prism is$\mu$, the angle of incidence i, is nearly equal to

asked Aug 20, 2018 by pady_1

1 answer

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is :

asked Aug 16, 2018 by pady_1

1 answer

If $\bigtriangleup U$ and $\bigtriangleup W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true ?

asked Jul 26, 2018 by pady_1

1 answer

A student measures the terminal potential difference (V) of a cell (of emf $\epsilon$ and internal) resistance r) as a function of the current (I) 0 flowing through it. The slope and intercept of the graph between V and I, then respectively equal to :

asked Jul 26, 2018 by pady_1

1 answer

The voltage gain of an amplifier with 9 % negative feedback is 10. The voltage gain without feedback will be -

asked Jul 26, 2018 by pady_1

1 answer

What is the value of inductance L for which the current is a maximum in a series LCR circuit with $C = 10 \mu F$ and $\omega = 1000^{-1}$

asked Jul 26, 2018 by pady_1

1 answer

The circular motion of a particle with constant speed is-

asked Jul 24, 2018 by pady_1

2 answers

Energy E of a hydrogen atom with principal quantum number n is given by $E=\frac{-13.6} {n^{6}}eV$. n The energy of a photon ejected when the electron jumps from n = 3 state to n = 2 state of hydrogen is approximately :-

asked Jul 24, 2018 by pady_1

1 answer

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2m then -

asked Jul 24, 2018 by pady_1

1 answer

For a common emmiter circuit if $\frac{I_C}{I_E} = 0.98$ then current gain for common emitter circuit will be :-

asked Jul 20, 2018 by pady_1

1 answer

Two spherical bob of masses $M_A$ and $M_B$ are hung vertically from two strings of length $l_A$ and $l_B$ respectively. They are excuting SHM with frequency relation $f_A$ =$2f_B$ , Then :

asked Jul 20, 2018 by pady_1

1 answer

In hot wire Ammeter due to flowing of current temperature of wire is increased by 5°C. If value of current is doubled, then increases in temperature will be :

asked Jun 15, 2018 by pady_1

1 answer

Ava wants to buy a skipping rope that costs Rs522, a board game that costs Rs1,102, and a playground ball that costs Rs497. She has saved Rs606 from her allowance, and her uncle gave her Rs179. How much more money does Ava need to buy the skipping rope, the game, and the ball?

asked Dec 31, 2015 by pady_1

1 answer

Brenda's vegetable patch is 7 metres wide and 13 metres long. Brenda wants to build a fence around the vegetable patch. The fencing material costs ₹64.00 per metre. How much would it cost in total to build to fence?

asked Dec 31, 2015 by pady_1

0 answers

$14\large\frac{1}{2}$ of 7

asked Dec 31, 2015 by pady_1

0 answers

A car travels a distance of 120 Kms in 2 hours. How much distance will the car travel in 12 minutes?

asked Dec 31, 2015 by pady_1

0 answers

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