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Recent questions tagged 44
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What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6]$ based on crystal field theory?
neet
chemistry
past papers
2019
44
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 :
jeemain
physics
past papers
1998
44
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 :
jeemain
physics
past papers
1999
44
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)$
jeemain
physics
past papers
2000
44
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 :
jeemain
physics
past papers
2001
44
asked
Dec 11, 2018
by
pady_1
0
answers
The energy band gap is maximum in :
jeemain
physics
past papers
2002
44
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 :
jeemain
physics
past papers
2003
44
asked
Dec 11, 2018
by
pady_1
1
answer
If $\begin{vmatrix} x-4 & 2x & 2x \\ 2x & x-4 & 2x \\ 2x & 2x & x-4 \end{vmatrix}= (A + Bx)(x-A)^2$<br> then the ordered pair (A, B) is equal to :
jeemain
math
past papers
2018
44
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 :<br>
jeemain
physics
past papers
2017
44
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 :
jeemain
chemistry
past papers
2016
44
asked
Dec 11, 2018
by
pady_1
0
answers
The correct order of thermal stability of hydroxides is :
jeemain
chemistry
past papers
2015
44
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
jeemain
math
past papers
2014
44
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
jeemain
math
past papers
2013
44
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
jeemain
physics
past papers
2012
44
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
jeemain
math
past papers
2011
44
asked
Dec 11, 2018
by
pady_1
0
answers
The combination of gates shown below yields
jeemain
physics
past papers
2010
44
asked
Dec 11, 2018
by
pady_1
0
answers
On the basis of the following thermochemical data : $(\Delta f G^{\circ} H^+_{(aq)} = 0 ) $ <br> $ H_2O (\ell) \to H^+ (aq) + OH^- (aq); \Delta H= 57.32 \; kJ$ <br> $H_2 (g) + \frac{1}{2} O_2 (g) \to H_2O (\ell); \Delta H = -286.20 \; kJ$ <br> The value of enthalpy of formation of $OH^-$ ion at $25^{\circ}C$ is :
jeemain
chemistry
past papers
2009
44
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)
jeemain
chemistry
past papers
2008
44
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 :
jeemain
physics
past papers
2007
44
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 :
jeemain
physics
past papers
2006
44
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 :
jeemain
math
past papers
2005
44
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 :
jeemain
physics
past papers
2005
44
asked
Nov 5, 2018
by
pady_1
0
answers
The solution of the differential equation $ y \;dx + (x +x^2y) dy=0$ is
jeemain
math
past papers
2004
44
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
neet
physics
past papers
2018
44
asked
Aug 21, 2018
by
pady_1
1
answer
The species, having bond angles of $120^o$ is
neet
chemistry
past papers
2017
44
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 :
neet
chemistry
past papers
2016
44
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 ? <br> (At. no Z = 22)
neet
chemistry
past papers
2015
44
asked
Aug 21, 2018
by
pady_1
1
answer
The given graph represents V-I characteristic for a semiconductor device. <br> <br> Which of the following statement is correct?
neet
physics
past papers
2014
44
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 -
neet
physics
past papers
2013
44
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
neet
physics
past papers
2012
44
asked
Aug 20, 2018
by
pady_1
1
answer
Photoelectric emission occurs only when the incident light has more than a certain minimum:
neet
physics
past papers
2011
44
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
neet
physics
past papers
2010
44
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 $. The energy of the projectile is :
neet
physics
past papers
2009
44
asked
Jul 26, 2018
by
pady_1
1
answer
A point performs simple harmonic oscillation of period T and the equation of motion is given by x = a sin ($(\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 ?
neet
physics
past papers
2008
44
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:
neet
physics
past papers
2007
44
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:-
neet
physics
past papers
2006
44
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
neet
physics
past papers
2005
44
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 :-
neet
physics
past papers
2004
44
asked
Jul 24, 2018
by
pady_1
1
answer
Diamagnetic material in a magnetic field moves :
neet
physics
past papers
2003
44
asked
Jul 24, 2018
by
pady_1
1
answer
Which of the following are suitable for the fusion process : -
neet
physics
past papers
2002
44
asked
Jul 23, 2018
by
pady_1
0
answers
Copper and silicon is cooled from 300 K to 60 K, the specific resistance : -
neet
physics
past papers
2001
44
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
neet
physics
past papers
2000
44
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 :
neet
physics
past papers
1998
44
asked
Jun 15, 2018
by
pady_1
1
answer
How many lines of symmetry does the picture taj mahal have
class5
math
olympiad
data handling
44
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?
class5
math
olympiad
measurements
44
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 $2\large\frac{1}{2} + \large\frac{7}{4}$
class5
math
olympiad
fractions
decimals
44
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?
class5
math
olympiad
computation
44
asked
Dec 31, 2015
by
pady_1
0
answers
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