Email
Chat with tutors
Login
Ask Questions, Get Answers
Menu
X
home
ask
tuition
questions
practice
papers
mobile
tutors
pricing
X
Recent questions in JEEMAIN and NEET
Questions
>>
JEEMAIN and NEET
JEEMAIN and NEET
Mathematics
Physics
Chemistry
Biology
NEET PAST PAPERS
JEEMAIN PAST PAPERS
De-Broglie proposed dual nature for electron by putting his famous equation $\lambda = \large\frac{h}{mu}$. Later on Heisenburg proposed uncertainity principle as $\bigtriangleup p .\bigtriangleup x \geq \large\frac{h}{2}(h = \large\frac{h}{2\pi})$ . On the contrary particle nature of electron was established on the basis of photoelectric effect. When a photon strikes the metal surface , it gives up its energy to the electron. Part of this energy (say w) is used by the electron to escape from the metal and the remaining imparts the kinetic energy $\large\frac{1}{2}mu^2$ to the photoelectron. The potential applied on the surface to reduce the velocity of photoelectron to zero is known as stopping potential. With what potential should a beam of electron be accelerated So that its wavelength becomes equal to $1.54A^{\large\circ}$
jeemain
chemistry
atomic-structure
unit2
medium
q194
asked
Feb 10, 2014
by
sharmaaparna1
1
answer
A wire of resistance $10\Omega$ is bent to form a circle. $P$ and $Q$ are two points on it such that the arc $PQ$ subtends a right angle at the center. A $3V$ battery having internal resistance of $ 1\Omega$ is connected across $P$ and Q, the currents in the two parts of the circle are
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
medium
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
If the line $y=mx+c$ touches the hyperbola $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ then find the value of c .
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q111
medium
mock
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Three resistances $ R, 2R$ and $3R$ are connected in parallel to a battery. Then
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
In a Hydrogen atom, an electron moves in an orbit of radius $5 \times 10^{-11}m$ with a speed of $2.2 \times 10^6 m/s.$ Calculate the equivalent current.
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
The foci of a hyperbola coincide with the foci of the ellipse $\large\frac{x^2}{25}+\frac{y^2}{9}$$=1$.Find the equation of the hyperbola if its ecentricity is 3?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q110
medium
asked
Feb 10, 2014
by
sreemathi.v
1
answer
To get maximum current through a resistance of $2.5\Omega$, one can use $‘m’ $ rows of cells, each containing $‘n’$ cells connected in series. The internal resistance of each cell is $0.5\Omega$. What are the values of $ n$ and $m$ if the total numbers of cells are $45$?
jeemain
physics
current-electricity
cbse
class12
ch5
cells-emf-and-internal-resistance
difficult
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
Find the length of latus rectum for the hyperbola $\large\frac{x^2}{36}-\frac{y^2}{16}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q109
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Find the general equation of rectangular hyperbola?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q108
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Three concentric spherical metallic shells A , B and C of radii a ,b and c $\;(c > b> a)\;$ have charge densities $\;\sigma , - \sigma \;and\; \sigma\;$ respectively . The potential of shell B is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 10, 2014
by
yamini.v
1
answer
A hyperbola whose asymptotes includes a right angle is said to be
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q107
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Find the position of the point (2,3) relative to the hyperbola $9x^2-y^2=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q106
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Find the value of a,b whose foci are (6,4) and (-4,4) and ecentricity is 2?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q105
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Length of conjugate axis is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q104
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Length of transverse axes is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q103
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
For the hyperbola $\large\frac{x^2}{36}-\frac{y^2}{16}$$=1$ find the ecentricity?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q102
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
A battery of internal resistance $2 \Omega$ is connected to a variable resistor whose value can be varied from $ 4\Omega\: to\: 10\Omega$. If the variable resistance is gradually increased from an initial value of $4\Omega$, the power consumed by it:
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
medium
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
How many electrons flow through the filament of a $120V, 60W $ bulb in one second?
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
A current of $1A $ is passing through $ CuSO_4 $ solution. How many $Cu^{+2}ions$ ions will be deposited at the cathode in 5 seconds?
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
The hyperbola whose transverse and conjugate axes respectively the conjugate and transverse axes of given hyperbola is called
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q101
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
A uniform wire has resistance $R$. It is cut into n equal parts and all of them are connected in parallel to each other. The resistance of the combination is:
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
A battery is supplying power to a tape-recorder by cable of resistance $0.02\Omega$. If the battery is generating $50W $ at $5V$, the power received by the tape-recorder is:
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
Write the equation of conjugate hyperbola for the hyperbola $\large\frac{x^2}{a^2}-\frac{y^2}{b^2}$$=1$
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q100
easy
asked
Feb 10, 2014
by
sreemathi.v
1
answer
Calculate the mean free path in $Cu$ at room temperature $300K$, if the number density of free electrons is $8.5 \times 10^{28}/m^3$ and resistivity $r = 1.7 \times 10^{-8} mho-m$. Given $k = 1.38 \times 10^{-23} J/K \: and\: 1A = 10^{-10} m$
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
A capacitor is charged and then made to discharge through a resistance. The time constant is $ \tau$. In what time will the potential difference across the capacitor decrease by 10%
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch3
charging-and-discharging-of-capacitors
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements.\[\] Statement- I: In a meter bridge experiment, the null point for the unknown resistance is measured. Now, the resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. \[\] Statement- II: Resistance of a metal increases with temperature.
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-and-potentiometer-instrumentation
easy
asked
Feb 10, 2014
by
thanvigandhi_1
1
answer
The tangent to a curve intersects x axis at $B$ and $y$ at $A$. The normal to same curve intersects $x$ axis at $C$ and $Y$ axis at $D$. Given $\large\frac{AO}{OB}= \frac{OC}{CD}$ curve passes through $(2,3)$. Find the curve
jeemain
math
class12
ch8
application-of-integrals
area-between-two-curves
q100
difficult
asked
Feb 10, 2014
by
meena.p
1
answer
Equation of conic defined by : $9yy'+4x=0 $ and given $y(0)=2$, find length of latus rectum
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q99
medium
asked
Feb 10, 2014
by
meena.p
1
answer
Equation of conic defined by : $9yy'+4x=0 \qquad y(0)=2$ find length of latus rectum
jeemain
math
class12
unit10
differential-equations
q99
medium
asked
Feb 10, 2014
by
meena.p
0
answers
De-Broglie proposed dual nature for electron by putting his famous equation $\lambda = \large\frac{h}{mu}$. Later on Heisenburg proposed uncertainity principle as $\bigtriangleup p .\bigtriangleup x \geq \large\frac{h}{2}(h = \large\frac{h}{2\pi})$ . On the contrary particle nature of electron was established on the basis of photoelectric effect. When a photon strikes the metal surface , it gives up its energy to the electron. Part of this energy (say w) is used by the electron to escape from the metal and the remaining imparts the kinetic energy $\large\frac{1}{2}mu^2$ to the photoelectron. The potential applied on the surface to reduce the velocity of photoelectron to zero is known as stopping potential . The wavelength of helium atom whose speed is equal to its rms speed at $27^{\large\circ}$ C
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q193
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
De-Broglie proposed dual nature for electron by putting his famous equation $\lambda = \large\frac{h}{mu}$. Later on Heisenburg proposed uncertainity principle as $\bigtriangleup p .\bigtriangleup x \geq \large\frac{h}{2}(h = \large\frac{h}{2\pi})$ . On the contrary particle nature of electron was established on the basis of photoelectric effect. When a photon strikes the metal surface , it gives up its energy to the electron. Part of this energy (say w) is used by the electron to escape from the metal and the remaining imparts the kinetic energy $\large\frac{1}{2}mu^2$ to the photoelectron. The potential applied on the surface to reduce the velocity of photoelectron to zero is known as stopping potential. With what velocity must an electron travel so that its momentum is equal to that of photon of wavelength of $\lambda = 5200A^{\large\circ}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q192
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
An oil drop has $-6.39\times10^{-19}$ coulomb charge .The number of electrons in this oil drop is
sat
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
sub-atomic-particles
easy
q191
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
The electrons in a poly-electronic atom are filled one by one in order of increasing energy level.The energy of sub shells and orientation of orbitals depends upon the values of three quantum numbers(i.e n,l and m respectively ) derived from Schrodinger wave equation. The different orbitals of subshells however possess same energy level and are called degenerate orbitals but their energy level changes in presence of magnetic field and the orbitals are non-degenerate. A spectral line is noticed if an electron jumps from one level to other. The paramagnetic nature of element is due to the presence of unpaired electron. The number of spherical and angular nodes in 2p orbital are:
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q190
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
The electrons in a poly-electronic atom are filled one by one in order of increasing energy level.The energy of sub shells and orientation of orbitals depends upon the values of three quantum numbers(i.e n,l and m respectively ) derived from Schrodinger wave equation. The different orbitals of subshells however possess same energy level and are called degenerate orbitals but their energy level changes in presence of magnetic field and the orbitals are non-degenerate. A spectral line is noticed if an electron jumps from one level to other. The paramagnetic nature of element is due to the presence of unpaired electron. The total Magnetic momentum of $Ni^{2+}$ ion is....
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q189
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
The electrons in a poly-electronic atom are filled one by one in order of increasing energy level.The energy of sub shells and orientation of orbitals depends upon the values of three quantum numbers(i.e n,l and m respectively ) derived from Schrodinger wave equation. The different orbitals of subshells however possess same energy level and are called degenerate orbitals but their energy level changes in presence of magnetic field and the orbitals are non-degenerate. A spectral line is noticed if an electron jumps from one level to other. The paramagnetic nature of element is due to the presence of unpaired electron. Which in each pair is most stable ion: $Cu^+ or Cu^{2+} and Fe^{2+} or Fe^{3+}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q188
asked
Feb 9, 2014
by
sharmaaparna1
1
answer
A constant voltage is applied to the two ends of a uniform metallic wire. Some heat is produced in it. The heat developed is doubled if
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. \[\] Statement- I: Electrons in a conductor have no motion in the absence of a potential difference across it. \[\] Statement- II: The electric field inside the static conductor is always zero.
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 3. The resistance of each edge is R
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 2. The resistance of each edge is R
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Find the resistance of the wire frame shaped as a cube when measured between the points 1 and 7. The resistance of each edge is R
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Two capacitors $C_1$ and $C_2$ are charged to $120\: V$ and $ 200\: V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then:
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. \[\] Statement- I: Higher the range, greater is the resistance of ammeter. \[\] Statement- II: To increase the range of ammeter, additional shunt needs to be used across it.
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-potentiometer-and-instumentation
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
The supply voltage to a room is $120\: V\: DC$. The resistance of the lead wires is $6 \Omega$. A $60\: W$ bulb is already switched on. What is the decrease of voltage across the bulb, when a $240\: W$ heater is switched on in parallel to the bulb?
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
In an $LCR$ circuit as shown below both switches are open initially. Now switch $S1$ is closed, $S2$ kept open. ($q$ is charge on the capacitor and $ \tau = RC$ is capacitive time constant). Which of the following statement is correct?
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
easy
asked
Feb 8, 2014
by
thanvigandhi_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
current-electricity
cbse
class12
ch5
ohms-law
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Two electric bulbs marked $25W – 220V$ and $100W – 220V$ are connected in series to a $440V$ supply. Which of the bulbs will fuse?
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. An oil drop has $-6.39\times10^{-19}$ coulomb charge. The number of electrons in this oil drop is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q187
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. An oxide on N has vapour density 46. The total number of electrons in 92g of it are:
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q186
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. What is the minimum energy given out when an electron jumps from one orbit to other form.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q185
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
A resistance of $2 \Omega$ is connected across one gap of a meter-bridge and an unknown resistance, greater than $2 \Omega$, is connected across the other gap. When these resistances are interchanged, the balance point shifts by $20cm$. The unknown resistance is
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-and-potentiometer-instrumentation
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Page:
« prev
1
...
278
279
280
281
282
283
284
...
393
next »
Home
Ask
Tuition
Questions
Practice
Your payment for
is successful.
Continue
...