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Recent questions in 2012
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JEEMAIN and NEET
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NEET PAST PAPERS
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2012
Transfer characteristics [output voltage $(V_0)$ vs input voltage $(V_i)$] for a base biased transistor in CE configuration is as show in the figure. For using transistor as a switch, it is used. <br>
neet
physics
past papers
2012
50
asked
Aug 20, 2018
by
pady_1
1
answer
C and Si both have same lattice structure, having 4 bonding electrons in each. However, C is insulator where as Si is intrinsic semiconductor. This is because.
neet
physics
past papers
2012
49
asked
Aug 20, 2018
by
pady_1
1
answer
In a CE transistor amplifier, the audio singal voltage across the collector resistance of $2k\Omega$ is 2V. If the v base resistance is $1 k\Omega$ and the current amplification of the transistor is 100, the input signal voltage is
neet
physics
past papers
2012
48
asked
Aug 20, 2018
by
pady_1
1
answer
The figure shown a logic circuit with two inputs A and B and the output C. The voltage wave farms across A, B and C are given. The logic circuit gate is <br>
neet
physics
past papers
2012
47
asked
Aug 20, 2018
by
pady_1
1
answer
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is <br>
neet
physics
past papers
2012
46
asked
Aug 20, 2018
by
pady_1
1
answer
A mixture consists of two radioactive materials $A_1$ and $A_2$ with half lives of $20\; s$ and $10\;s$ respectively. Initially the mixture has $40 \;g$ of $ A_1$ and $160\; g$ of $A_2$. The amount of the two in the mixture will become equal after :
neet
physics
past papers
2012
45
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
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be
neet
physics
past papers
2012
43
asked
Aug 20, 2018
by
pady_1
1
answer
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths $\lambda_1 : \lambda_2$ emitted in the two cases is
neet
physics
past papers
2012
42
asked
Aug 20, 2018
by
pady_1
1
answer
A 200 W sodium street lamp emits yellow light of wavelength $0.6 \mu m$. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is .
neet
physics
past papers
2012
41
asked
Aug 20, 2018
by
pady_1
1
answer
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is
neet
physics
past papers
2012
40
asked
Aug 20, 2018
by
pady_1
1
answer
An $\alpha$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 $\frac{Wb}{m^2}$ . The de-Broglie wavelength associated with the particle will be
neet
physics
past papers
2012
39
asked
Aug 20, 2018
by
pady_1
1
answer
When a biconves lens of glass having refractive index 1.47 is dipped in a liqud, it acts as a plane sheet of glass. This implies that the liquid must have refractive index.
neet
physics
past papers
2012
38
asked
Aug 20, 2018
by
pady_1
1
answer
A concave mirror of focal length $'f_1'$ is placeed at a distance of 'd' from a convex lens of focal length $'f_2'$ A beam of light coming from infinity and falling on this convex lens- concave mirror combination returns to infinity. The dsitance 'd' must equal
neet
physics
past papers
2012
37
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
neet
physics
past papers
2012
36
asked
Aug 20, 2018
by
pady_1
1
answer
The magnifying power of a teloscope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are
neet
physics
past papers
2012
35
asked
Aug 20, 2018
by
pady_1
1
answer
An alternating electric field, of frequency v, is applied across the dees (radius = R) of a cyclotron that is being used to accelerated protons (mass = m). The operating magnetic field (B) used in the cyclotron and the kinetic energy (K) of the proton beam, produced by it, are given by
neet
physics
past papers
2012
34
asked
Aug 20, 2018
by
pady_1
1
answer
Two similar coils of radius R are lying concentrically with their planes at right angles to each other.The currents flowing in them are I and 2I, respectively. The resultant magnetic field induction at the centre will be
neet
physics
past papers
2012
33
asked
Aug 20, 2018
by
pady_1
1
answer
A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere rage. The value (in ohm) of necessary shunt will be
neet
physics
past papers
2012
32
asked
Aug 20, 2018
by
pady_1
1
answer
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It.
neet
physics
past papers
2012
31
asked
Aug 20, 2018
by
pady_1
1
answer
Four point charge –Q, –q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is
neet
physics
past papers
2012
30
asked
Aug 20, 2018
by
pady_1
1
answer
An electric dipole of moment 'p' is placed in an electric field of intensity 'E'. The dipole acquires a position such that the axis of the dipole makes an angle $\theta$ with the direction of the field.Assuming that the potential energy of the dipole to be zero when $\theta = 90º$, the torque and the potential energy of thedipole will respectively be
neet
physics
past papers
2012
29
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.
neet
physics
past papers
2012
28
asked
Aug 20, 2018
by
pady_1
1
answer
The electric field associated with an e. m. wave in vacuum is given by $\overrightarrow{E}=\hat{i}40 cos(KZ-6\times10^8t)$,where E, z and t are in ${volt}{m}$, meter and seconds respectively. The value of wave vector k is :
neet
physics
past papers
2012
27
asked
Aug 20, 2018
by
pady_1
1
answer
In the circuit shown the cells A and B have negligible resistance. For $V_A = 12V, R_1 = 500\Omega and R =100 \Omega$ the galvanometer (G) shows no deflection. The value of $V_B$ is
neet
physics
past papers
2012
26
asked
Aug 20, 2018
by
pady_1
1
answer
If voltage across a bulb rated 220 Volts.- 100 Watt drops by 2.5% of its rated value the percentage of the rated value by which the power would decrease is
neet
physics
past papers
2012
25
asked
Aug 20, 2018
by
pady_1
1
answer
A ring is made of a wire having a resistance $R_0 = 12\Omega$ . Find the points A and B, as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub circuit between these points is equal to $\frac{8}{3}\Omega$ : <br>
neet
physics
past papers
2012
24
asked
Aug 20, 2018
by
pady_1
1
answer
In an electrical circuit R, L, C and an a.c. voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the ciruit is $\frac{\pi}{3}$ . If instead, C is removed from the circuit, the phase difference is again $\frac{\pi}{3}$ . The power factor of the circuit is
neet
physics
past papers
2012
23
asked
Aug 20, 2018
by
pady_1
1
answer
The current (I) in the inductance is varying with time according to the plot shown in figure. Which one of the following is the correct variation of voltage with time in the coil ? <br>
neet
physics
past papers
2012
22
asked
Aug 20, 2018
by
pady_1
1
answer
A coil of resistance $400\Omega$ is placed in a magnetic filed. if the magnetic flux $\phi$ (wb) linked with the coil varies with times t(sec) as <br> $\phi = 50 t^2 + 4.$ . The current is the coil at t = 2 sec is
neet
physics
past papers
2012
21
asked
Aug 20, 2018
by
pady_1
1
answer
If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q ?
neet
physics
past papers
2012
20
asked
Aug 20, 2018
by
pady_1
1
answer
Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time ?
neet
physics
past papers
2012
19
asked
Aug 20, 2018
by
pady_1
1
answer
A thermodynamics system is taken trough the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is : <br>
neet
physics
past papers
2012
18
asked
Aug 20, 2018
by
pady_1
1
answer
One mole of an ideal gas goes from an initial state A to final state B via two processes : It firs undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3toVat constant pressure. The correct P-V diagram representing the two processes is:
neet
physics
past papers
2012
17
asked
Aug 20, 2018
by
pady_1
1
answer
When a string is divided into three segments of length $l_1,\; l_2 \;and\; l_3$, the fundamental frequencies of these three segments are $v_1, \;v_2 \;and \;v_3$ respectively. The original functamental frequency (v) of the string is :
neet
physics
past papers
2012
16
asked
Aug 20, 2018
by
pady_1
1
answer
Two sources of sound placed close to each other, are emitting progressive waves given by $y_1 = 4 sin 600 \pi t $ and $y_2 = 5 sin 608 \pi t$
neet
physics
past papers
2012
15
asked
Aug 20, 2018
by
pady_1
1
answer
The height at which the weight of a body becomes $\frac{1}{16}$th , its weight on the surface of earth (radius R), is
neet
physics
past papers
2012
14
asked
Aug 20, 2018
by
pady_1
1
answer
A geostationary satellite is orbiting the earth at a height of 5R above that surface of the earth, R being the radius of the earth. The time period of another satellite of the earth. The time period of another satellite in hours at a height of 2R from the surface of the earth is
neet
physics
past papers
2012
13
asked
Aug 20, 2018
by
pady_1
1
answer
A spherical planet has a mass $M_P$ and diameter $D_P$. A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity, equal to
neet
physics
past papers
2012
12
asked
Aug 20, 2018
by
pady_1
1
answer
When a mass is rotating in a plane about a fixed point, its angular momentum is directed along
neet
physics
past papers
2012
11
asked
Aug 20, 2018
by
pady_1
1
answer
ABC is an equilateral triangle with O as its centre $\overrightarrow{F_1},\overrightarrow{F_2} and \overrightarrow{F_3}$ represent three forces acting along the sides AB, BC and AC respectively. If the torque about O is zero then the magnitude of $\overrightarrow{F_3}$ is
neet
physics
past papers
2012
10
asked
Aug 20, 2018
by
pady_1
1
answer
Two persons of masses 55 kg and 65kg respectively, are at the opposite ends of a boat. The length of the boat is 30. m and weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the center of mass of the system shift by:
neet
physics
past papers
2012
9
asked
Aug 20, 2018
by
pady_1
1
answer
Two spheres A and B of masses m1 and m2 respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity$\frac{v}{2}$ in a direction perpendicular to the original direction. The mass A moves after collision in the direction.
neet
physics
past papers
2012
8
asked
Aug 20, 2018
by
pady_1
1
answer
The potential energy of a particle in a force field is :$U=\frac{A}{r^2}-\frac{B}{r}$ where A and B are positive constants and r is the distance of particle from the centre of the field. For stable equilibrium, the distance of the particle is
neet
physics
past papers
2012
7
asked
Aug 20, 2018
by
pady_1
1
answer
A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity $4 ms^{–1}$. It collides with a horizontal spring of force constant $200 Nm^{–1}$ . The maximum compression produced in the spring will be
neet
physics
past papers
2012
6
asked
Aug 20, 2018
by
pady_1
1
answer
A car of mass $1000\; kg$ negotiates a banked curve of radius $90\;m$ on a frictionless road. If the banking angle is $45^{\circ}$, the speed of the car is
neet
physics
past papers
2012
5
asked
Aug 20, 2018
by
pady_1
1
answer
A particle has initial velocity $\bigg( 2\overrightarrow{i}+3 \overrightarrow{j}\bigg)$ and acceleration $\bigg( 0.3\overrightarrow{i}+0.2 \overrightarrow{j}\bigg)$ .The magnitude of velocity after 10 seconds will be
neet
physics
past papers
2012
4
asked
Aug 20, 2018
by
pady_1
1
answer
The horizontal range and the maximum height of a projectile are equal . The angle of projection of the projectile is:
neet
physics
past papers
2012
3
asked
Aug 20, 2018
by
pady_1
1
answer
The motion of a particle along a straight line is described by equation $x = 8 + 12t –t^3$ where x is in metre and t in second. The retardation of the particle when its velocity becomes zero is
neet
physics
past papers
2012
2
asked
Aug 20, 2018
by
pady_1
1
answer
The damping force on a oscillator is directly proportional to the velocity. The Unit of the constant of proportionality are
neet
physics
past papers
2012
1
asked
Aug 20, 2018
by
pady_1
1
answer
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