Recent questions tagged 28

Which is the correct thermal stability order for$H_2E$ (E=O, S, Se, Te and Po) ?

asked Jul 8, 2019 by pady_1

1 answer

A man stands in front of a hillock and fires a gun. He hears an echo after 1.5 s. The distance of the hillock from the man is (velocity of sound in air is 330 m/s) :

asked Dec 19, 2018 by pady_1

0 answers

The relation between melting point of ice and pressure is shown by ice line, which will be :

asked Dec 19, 2018 by pady_1

0 answers

A body of mass $m_1$ moving with a velocity $10\;ms^{-1}$ collides with another body at rest of mass $m_2$. After collision the velocities of the two bodies are $2\;ms^{-1}$ and $5 \; ms^{-1}$ respectively, along the direction of motion of $m_1$. The ratio $\frac{m_1}{m_2}$ is :

asked Dec 19, 2018 by pady_1

0 answers

Consider the following statements A and B and identify the correct choice in the given answers. A. Tightly bound electrons of target material scatter X-ray photon, resulting in the Compton effect. B. Photoelectric effect takes place with free electrons.

asked Dec 11, 2018 by pady_1

0 answers

Which of the following are not electromagnetic waves ?

asked Dec 11, 2018 by pady_1

0 answers

A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is :

asked Dec 11, 2018 by pady_1

0 answers

All the graph are intendent to represent the same motion. One of them does it incorrectly. Pick it up

asked Dec 11, 2018 by pady_1

0 answers

The radius of a circle, having minimum area, which touches the curve $y = 4 - x^2$ and the lines, $y = |x|$ is

asked Dec 11, 2018 by pady_1

1 answer

In an experiment for determination of refractive index of glass of a prism by $i− \delta$, plot, it was found that a ray incident at angle $35^{\circ}$, suffers a deviation of $40^{\circ}$ and that it emerges at angle $79^{\circ}$ ⋅ Ιn that case which of the following is closest to the maximum possible value of the refractive index ?

asked Dec 11, 2018 by pady_1

0 answers

If one were to apply Bohr model to a particle of mass $'m'$ and charge $'q'$ moving in a plane under the influence of a magnetic field $'B'$, the energy of the charged particle in the $n^{th}$ level will be :

asked Dec 11, 2018 by pady_1

0 answers

On heating water, bubbles being formed at the bottom of the vessel detach and rise. Take the bubbles to be spheres of radius R and making a circular contact of radius r with the bottom of the vessel. If r < < R, and the surface tension of water is T, value of r just before bubbles detach is : (density of water is $\rho_w$)

asked Dec 11, 2018 by pady_1

0 answers

Energy of an electron is given by $E= -2.178 \times 10^{18} J \bigg(\large\frac{Z^2}{n^2}\bigg)$. Wavelength of light required to excite an electron in an hydrogen atom from level $n = 1$ to $n = 2$ will be

asked Dec 11, 2018 by pady_1

0 answers

Consider the function $f(x) = |x-2| + |x-5|, x \in R$. Statement 1: $f'(4) = 0$ Statement 2 : $f$ is continuous in [2, 5], differentiable in (2, 5) and $f(2) = f(5)$.

asked Dec 11, 2018 by pady_1

0 answers

100 g of water is heated from $30^{\circ}C$ to $50^{\circ}C$. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4148 J/Kg/K) :

asked Dec 11, 2018 by pady_1

0 answers

The correct order of $E^0_{M^2/M}$ values with negative sign for the four successive elements $Cr,Mn,Fe$

asked Dec 11, 2018 by pady_1

0 answers

Assuming the gas to be ideal the work done on the gas in taking it from A to B is

asked Nov 29, 2018 by pady_1

0 answers

The differential equation of the family of circles with fixed radius 5 units and centre on the line y = 2 is

asked Nov 29, 2018 by pady_1

0 answers

The equation of a tangent to the parabola $y^2 = 8x$ is $ y = x + 2$. The point on this line from which the other tangent to the parabola is perpendicular to the given tangent is :

asked Nov 29, 2018 by pady_1

0 answers

The resistance of a bulb filament is $100 \Omega$ at a temperature of $100^{\circ}$C. If its temperature coefficient of resistance be $0.005 \; per \; ^{\circ}C$, its resistance will become $200 \Omega$ at a temperature of :

asked Nov 13, 2018 by pady_1

0 answers

If $x = \displaystyle\sum_{n=0}^{\alpha} a^n,y=\displaystyle\sum_{n=0}^{\alpha} b^n,z= \displaystyle\sum_{n=0}^{\alpha} c^n$ where $a, b, c$ are in AP and $|a| < 1, |b| < 1, |c|<1$, then $x, y, z$ are in :

asked Nov 5, 2018 by pady_1

0 answers

The intensity of gamma radiation from a given source is $I$. On passing through 36 mm of lead, it is reduced to $\frac{I}{8}$. The thickness of lead, which will reduce the intensity to$\frac{I}{2}$ will be :

asked Nov 5, 2018 by pady_1

0 answers

If $\displaystyle\sum_{x \to \alpha} \begin{pmatrix}1 + \frac{a}{x} + \frac{b}{x^2} \end{pmatrix}^{2x} = e^2 $ then the values of $a$ and $b$, are

asked Nov 5, 2018 by pady_1

0 answers

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

asked Aug 21, 2018 by pady_1

1 answer

Consider the reactions : Identify A, X, Y and Z

asked Aug 21, 2018 by pady_1

1 answer

Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape ?

asked Aug 21, 2018 by pady_1

1 answer

The stability of +1 oxidation state among Al, Ga, In and Tl in creases in the sequence -

asked Aug 21, 2018 by pady_1

1 answer

A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance, R, connected acrose the given cell, has values of. (i) infinity $\; \; \; \; \; \; $ (ii) 9.5 Q The 'balancing lengths, on the potentiometer wire are found to be 3m and 2.85 m, respectively. The value of internal resistance of the cell is:

asked Aug 20, 2018 by pady_1

1 answer

When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration $3a_0$ toward west. The electric and magnetic fields in the room are -

asked Aug 20, 2018 by pady_1

1 answer

What is the flux through a cube of side 'a' if a point charge of q is at one of its corner.

asked Aug 20, 2018 by pady_1

1 answer

An ac voltage is applied to a resistance R and the inductive reactance are both equal to $3 \Omega$, the phase difference between the applied voltage and the current in the circuit is :

asked Aug 16, 2018 by pady_1

1 answer

A gramophone record is revolving with angular velocity $\omega$. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is µ. The coin will revolve with the record if –

asked Jul 26, 2018 by pady_1

1 answer

The magnetic force acting on a charged particle a of charge – 2µc in a magnetic field of 2T acting in y direction, when the particle velocity is $(2\widehat{i} + 3\widehat{j})\times 10^5ms^-1$, is :

asked Jul 26, 2018 by pady_1

1 answer

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10 % of energy. How much power is generated by the turbine ? (g = 10${\frac{m}{s}}^ 2$)

asked Jul 26, 2018 by pady_1

1 answer

A steady current of $1.5$ amp flows through a copper voltameter for 10 minutes. If the electrochemical equivalent of copper is $30 \times 10^{–5}$ gm $coulomb^{–1}$, the mass of copper deposited on the electrode will be: -

asked Jul 26, 2018 by pady_1

1 answer

A coil of inductive reactance $31\Omega$ has a resistance of $8\Omega$. It is placed in series with a condenser of capacity reactance $25\Omega$. The combination is connected to an a.c. source of 110 volt. The power factor of the circuit is:-

asked Jul 25, 2018 by pady_1

1 answer

In any fission process the ratio mass of fission products is- mass of parent nucleus

asked Jul 24, 2018 by pady_1

1 answer

A round disc of moment of inertia $I_2$ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia $I_1$ rotating with an angular velocity $\omega$ about the same axis. The final angular velocity of the combination of discs is :-

asked Jul 24, 2018 by pady_1

1 answer

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled -

asked Jul 24, 2018 by pady_1

2 answers

A particle (A) is droped from a height and another particle (B) is projected in horizontal direction with speed of 5 m/s from the same height then correct statement is : -

asked Jul 23, 2018 by pady_1

1 answer

In Thomson mass spectrograph $\overrightarrow{E} \bot \overrightarrow {B}$ then the velocity of underflected electron beam will be :

asked Jul 20, 2018 by pady_1

1 answer

The equations of two waves given as $X=acos(\omega t+\delta)$ and $X=acos(\omega t+ \alpha)$, Where $\delta=\alpha+\frac{\pi}{2}$, then resultant wave represent :

asked Jul 20, 2018 by pady_1

0 answers

When volume changes from V to 2V at constant pressure(P) then the change in internal energy will be :

asked Jun 15, 2018 by pady_1

1 answer

For breakfast, Bella bought a muffin for ₹44.00 and a cup of coffee for ₹115.50. For lunch, Bella had soup, a salad, and lemonade. The soup cost ₹177.50, the salad cost ₹475.50, and the lemonade cost ₹91.50. How much more money did Bella spend on lunch than on breakfast?

asked Dec 31, 2015 by pady_1

0 answers

The following bar chart shows the number of fruits in a shop, There are _______ less oranges than pomegranates.

asked Dec 31, 2015 by pady_1

0 answers

Find the area of a rectangle of length 15 mm and breadth 7 mm.

asked Dec 31, 2015 by pady_1

0 answers

$2 \large\frac{1}{7} \div \large\frac{7}{2}$

asked Dec 31, 2015 by pady_1

0 answers

A team won 80\% of the 15 games played by it. How many games did it win? How many games did it loss?

asked Dec 31, 2015 by pady_1

0 answers

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