Recent questions tagged 44

What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6]$ based on crystal field theory?

asked Jul 8, 2019 by pady_1

1 answer

An electron remains undeflected when passing perpendicular to mutually perpendicular electric and magnetic fields. If the magnetic field is 8 Gauss and the electric field is $400\; V/m$, the velocity of the electron is :

asked Dec 19, 2018 by pady_1

0 answers

The neutral temperature of a thermocouple with cold junction at $20^{\circ}C$ is $220^{\circ}C$. Its temperature of inversion is :

asked Dec 19, 2018 by pady_1

0 answers

An ideal gas at a pressure of $1\;atm$ and temperature of $27^{\circ}C$ is compressed adiabatically until its pressure becomes 8 times the initial pressure , then final temperature is :$ (\gamma = 3/2)$

asked Dec 19, 2018 by pady_1

0 answers

Two particles P and Q start from origin and execute simple harmonic motion along X-axis with the same amplitude but with period 3 seconds and 6 seconds respectively. The ratio of the velocities of P and Q when they meet is :

asked Dec 11, 2018 by pady_1

0 answers

The energy band gap is maximum in :

asked Dec 11, 2018 by pady_1

0 answers

A radioactive sample at any instant has its disintegration rate 5000 disintegrations per minute. After 5 minutes, the rate is 1250 disintegrations per minute. Then, the decay constant (per minute) is :

asked Dec 11, 2018 by pady_1

1 answer

If $\begin{vmatrix} x-4 & 2x & 2x \\ 2x & x-4 & 2x \\ 2x & 2x & x-4 \end{vmatrix}= (A + Bx)(x-A)^2$ then the ordered pair (A, B) is equal to :

asked Dec 11, 2018 by pady_1

1 answer

In a coil resistance $100 \Omega$, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is :

asked Dec 11, 2018 by pady_1

0 answers

The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :

asked Dec 11, 2018 by pady_1

0 answers

The correct order of thermal stability of hydroxides is :

asked Dec 11, 2018 by pady_1

0 answers

Let $f_K(x) = \frac{1}{k} (\sin^k x + \cos^k x)$ where $x \in R$ and $k \geq 1$. Then $f_4(x) - f_6(x)$ equals

asked Dec 11, 2018 by pady_1

1 answer

The expression $\frac{\tan A}{1 - \cot A} + \frac{\cot A}{1 - \tan A} $ can be written as

asked Dec 11, 2018 by pady_1

1 answer

Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is

asked Dec 11, 2018 by pady_1

1 answer

If the angle between the line $x= \frac{y-1}{2} = \frac{z-3}{\lambda}$ and the plane $x + 2y + 3z = 4$ is $\cos^{-1} (\sqrt{\frac{5}{14}})$, then $\lambda$ equals

asked Dec 11, 2018 by pady_1

0 answers

The combination of gates shown below yields

asked Dec 11, 2018 by pady_1

0 answers

On the basis of the following thermochemical data : $(\Delta f G^{\circ} H^+_{(aq)} = 0 ) $ $ H_2O (\ell) \to H^+ (aq) + OH^- (aq); \Delta H= 57.32 \; kJ$ $H_2 (g) + \frac{1}{2} O_2 (g) \to H_2O (\ell); \Delta H = -286.20 \; kJ$ The value of enthalpy of formation of $OH^-$ ion at $25^{\circ}C$ is :

asked Nov 29, 2018 by pady_1

0 answers

At 80oC, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80oC and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

asked Nov 29, 2018 by pady_1

0 answers

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be :

asked Nov 29, 2018 by pady_1

0 answers

Four point masses, each of value $m$, are placed at the corners of a square ABCD of side $l$. The moment of inertia of this system about an axis passing through A and parallel to BD is :

asked Nov 13, 2018 by pady_1

0 answers

If the plane $2ax - 3ay + 4az + 6 = 0$ passes through the mid point of the line joining the centres of the spheres $x^2 + y^2 +z^2 + 6x - 8y - 2z = 13$ and $ x^2 + y^2 + z^2 - 10x +4y - 2z = 8 $, than $a$ equals :

asked Nov 5, 2018 by pady_1

0 answers

In a common base amplifer, the phase difference between the input signal voltage and output voltage is :

asked Nov 5, 2018 by pady_1

0 answers

The solution of the differential equation $ y \;dx + (x +x^2y) dy=0$ is

asked Nov 5, 2018 by pady_1

0 answers

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is

asked Aug 21, 2018 by pady_1

1 answer

The species, having bond angles of $120^o$ is

asked Aug 21, 2018 by pady_1

1 answer

The ionic radii of $A^+$ and $B^–$ ions are $0.98 \times 10^{–10}$ m and $1.81 \times 10^{–10}$ m. The coordination number of each ion in AB is :

asked Aug 21, 2018 by pady_1

1 answer

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no Z = 22)

asked Aug 21, 2018 by pady_1

1 answer

The given graph represents V-I characteristic for a semiconductor device. Which of the following statement is correct?

asked Aug 20, 2018 by pady_1

1 answer

In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be -

asked Aug 20, 2018 by pady_1

1 answer

If the nuclear radius $of^{27}$ Al is 3.6 Fermi, the approximate nuclear radius $of ^{64}$ Cu in Fermi is

asked Aug 20, 2018 by pady_1

1 answer

Photoelectric emission occurs only when the incident light has more than a certain minimum:

asked Aug 16, 2018 by pady_1

2 answers

The potential difference that must be applied to stop the fastest photo electrons emitted by a nick surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be

asked Jul 26, 2018 by pady_1

1 answer

In a Rutherford scattering experiment when a projectile of charge $Z_1 $ and mass $M_1$ approaches a target nucleus of charge $Z_2 $ and mass $M_2 $, the distance of closest approach is $r_0 $. The energy of the projectile is :

asked Jul 26, 2018 by pady_1

1 answer

A point performs simple harmonic oscillation of period T and the equation of motion is given by x = a sin ($(\omega t+\frac{\pi}{6})$). After the elapse of what fraction of the time period the velocity of the point will be equal to half of its maximum velocity ?

asked Jul 26, 2018 by pady_1

1 answer

A nucleus $^A_Z X$ has mass represented by $M(A,Z)$. If $M_p$ and $M_n$ denote the mass of proton and neutron respectively and B.E. the binding energy in MeV, then:

asked Jul 26, 2018 by pady_1

1 answer

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery the distance between the plates of the capacitor is increased using an insulating handle. As a result the potential difference between the plates:-

asked Jul 25, 2018 by pady_1

1 answer

A force F acting on an object varies with distance x as shown here. The force is in N and x in m. The work done by the force in moving the object from x = 0 to x = 6 m is

asked Jul 24, 2018 by pady_1

1 answer

An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipol moment is along the direction of the field, the force on it and its potential energy are respectively :-

asked Jul 24, 2018 by pady_1

1 answer

Diamagnetic material in a magnetic field moves :

asked Jul 24, 2018 by pady_1

1 answer

Which of the following are suitable for the fusion process : -

asked Jul 23, 2018 by pady_1

0 answers

Copper and silicon is cooled from 300 K to 60 K, the specific resistance : -

asked Jul 20, 2018 by pady_1

1 answer

For a planet having mass equal to mass of the earth but radius is one fourth of radius of the earth. Then escape velocity for this planet will be

asked Jul 20, 2018 by pady_1

1 answer

A rigid rod is placed against the wall as shown in figure. When its velocity of lower end is $10 ms^{ â€“1}$ and its base makes an angle $\alpha$ = 60Â° with horizontal, then the vertical velocity of its end B will be :

asked Jun 15, 2018 by pady_1

1 answer

How many lines of symmetry does the picture taj mahal have

asked Dec 31, 2015 by pady_1

1 answer

In an orchard, 172.5 kg of oranges are picked by the evening. Over the next hour, 6 workers add 3 kg 600 g of oranges each, and 5 workers remove 4.7 kg of bad fruits each. What is the total weight of oranges remaining?

asked Dec 31, 2015 by pady_1

0 answers

Simplify $3 \large\frac{1}{3} \div \large\frac{5}{3} - \large\frac{1}{10}$ of $2\large\frac{1}{2} + \large\frac{7}{4}$

asked Dec 31, 2015 by pady_1

0 answers

A seed company filled 3 bags with seed. They put 50 grams of seed in each bag. How many grams of seed are there in all the bags combined?

asked Dec 31, 2015 by pady_1

0 answers

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