JEE Main 2005 Physics Paper: AIEEE

A circuit has a resistance of $12\ \text{ohm}$ and an impedance of $15\ \text{ohm}$. The power factor of the circuit will be

The self inductance of the motor of an electric fan is $10\text{ H}$. In order to impart maximum power at $50\text{ Hz}$, it should be connected to a capacitance of

The phase difference between the alternating current and $emf$ is $\frac{\pi}{2}.$ Which of the following cannot be the constituent of the circuit?

The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is $C$ then the resultant capacitance is

A fully charged capacitor has a capacitance $'C'$. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity $'s'$ and mass $'m'.$ If the temperature of the block is raised by $'\Delta T',$ the potential difference $'v'$ across the capacitor is

A T shaped object with dimensions shown in the figure, is lying on a smooth floor. A force $'\vec{F}'$ is applied at the point $P$ parallel to $AB,$ such that the object has only the translational motion without rotation. Find the location of $P$ with respect to $C.$

A body $A$ of mass $M$ while falling vertically downwards under gravity breaks into two-parts; a body $B$ of mass $\frac{1}{3}M$ and a body $C$ of mass $\frac{2}{3}M.$ The center of mass of bodies $B$ and $C$ taken together shifts compared to that of body $A$ towards

An energy source will supply a constant current into the load if its internal resistance is

Two sources of equal $\text{emf}$ are connected to an external resistance $R.$ The internal resistances of the two sources are $R_1$ and $R_2\ (R_2 > R_1).$ If the potential difference across the source having internal resistance $R_2$ is zero, then

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

The resistance of hot tungsten filament is about $10$ times the cold resistance. What will be resistance of $100\text{ W}$ and $200\text{ V}$ lamp when not in use?

Two voltmeters, one of copper and another of silver, are joined in parallel. When a total charge $q$ flows through the voltmeters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are $Z_1$ and $Z_2$ respectively the charge which flows through the silver voltmeter is

In the circuit, the galvanometer $G$ shows zero deflection. If the batteries $A$ and $B$ have negligible internal resistance, the value of the resistor $R$ will be -

A moving coil galvanometer has $150$ equal divisions. Its current sensitivity is $10$- divisions per milliampere and voltage sensitivity is $2$ divisions per millivolt. In order that each division reads $1$ volt, the resistance in $ohms$ needed to be connected in series with the coil will be -

In a potentiometer experiment the balancing with a cell is at length $240\text{ cm}.$ On shunting the cell with a resistance of $2\ \Omega,$ the balancing length becomes $120\text{ cm}$. The internal resistance of the cell is

If the kinetic energy of a free electron doubles, it's deBroglie wavelength changes by the factor

A photocell is illuminated by a small bright source placed $1\ m$ away. When the same source of light is placed $\frac{1}{2}\ m$ away, the number of electrons emitted by photo-cathode would

A coil of inductance $300\text{ mH}$ and resistance $2\,\Omega$ is connected to a source of voltage $2\text{ V}$. The current reaches half of its steady state value in

One conducting $U$ tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field $B$ is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed $v,$ then the $\text{emf}$ induced in the circuit in terms of $B, l$ and $v$ where $l$ is the width of each tube, will be

Two point charges $+8q$ and $-2q$ are located at $x = 0$ and $x = L$ respectively. The location of a point on the $x$ axis at which the net electric field due to these two point charges is zero is

Two thin wire rings each having a radius $R$ are placed at a distance $d$ apart with their axes coinciding. The charges on the two rings are $+q$ and $-q.$ The potential difference between the centres of the two rings is

A charged ball $B$ hangs from a silk thread $S,$ which makes angle $\theta$ with a large charged conducting sheet $P,$ as shown in the figure. The surface charge density $\sigma$ of the sheet is proportional to

Average density of the earth

The change in the value of $g$ at a height $h$ above the surface of the earth is the same as at a depth $d$ below the surface of earth. When both $d$ and $h$ are much smaller than the radius of earth, then which one of the following is correct?

A particle of mass $10\text{ g}$ is kept on the surface of a uniform sphere of mass $100\text{ kg}$ and radius $10\text{ cm}.$ Find the work to be done against the gravitational force between them to take the particle far away from the sphere (you may take $G = 6.67 \times 10^{-11}\text{ N m}^2/\text{kg}^2$)

The figure shows a system of two concentric spheres of radii $r_1$ and $r_2$ are kept at temperatures $T_1$ and $T_2$, respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to

A block is kept on a frictionless inclined surface with angle of inclination $\text{'}\alpha\text{'}.$ The incline is given an acceleration $a$ to keep the block stationary. Then $a$ is equal to

Consider a car moving on a straight road with a speed of $100\text{ m/s}$. The distance at which car can be stopped is $[\mu_k = 0.5]$

A smooth block is released at rest on a $45^\circ$ incline and then slides a distance $'d'$. The time taken to slide is $'n'$ times as much to slide on rough incline than on a smooth incline. The coefficient of friction is

A particle of mass 0.3 kg subjected to a force $F = -kx$ with $k = 15\text{ N/m}$. What will be its initial acceleration if it is released from a point 20 cm away from the origin?

A magnetic needle is kept in a non-uniform magnetic field. It experiences:

If $S$ is stress and $Y$ is young's modulus of material of a wire, the energy stored in the wire per unit volume is

A car starting from rest accelerates at the rate f through a distance S, then continues at constant speed for time t and then decelerates at the rate $\frac{f}{2}$ to come to rest. If the total distance traversed is 15 S, then

A parachutist after bailing out falls $50\text{ m}$ without friction. When parachute opens, it decelerates at $2\text{ m/s}^2.$ He reaches the ground with a speed of $3\text{ m/s}$. At what height, did he bail out?

The relation between time t and distance x is t = ax2 + bx where a and b are constants. The acceleration is

Two concentric coils each of radius equal to $2\pi\text{ cm}$ are placed at right angles to each other. $3$ ampere and $4$ ampere are the currents flowing in each coil respectively. The magnetic induction in Weber / $\text{m}^2$ at the center of the coils will be

$\left(\mu_0 = 4\pi \times 10^{-7}\text{ Wb/A m}\right)$

Two thin, long, parallel wires, separated by a distance $'d'$ carry a current of $'i'\ A$ in the same direction. They will

A charged particle of mass $m$ and charge $q$ travels on a circular path of radius $r$ that is perpendicular to a magnetic field $B.$ The time taken by the particle to complete one revolution is

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity then

Starting with a sample of pure ${}^{66}Cu,\ \frac{7}{8}$ of it decays into $Zn$ in $15$ minutes. The corresponding half life is

A nuclear transformation is denoted by $X\,(n, \alpha)\,{}_{3}^{7}Li.$ Which of the following is the nucleus of element $X$?

If radius of the ${}_{13}^{27}Al$ nucleus is estimated to be $3.6$ fermi then the radius of ${}_{52}^{125}Te$ nucleus is estimated to be nearly

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

If a simple harmonic motion is represented by $\frac{d^2x}{dt^2} + \alpha x = 0.$ its time period is

The function $\sin^2(\omega t)$ represents

Two simple harmonic motions are represented by the equations $y_1 = 0.1\sin\left(100\pi t + \frac{\pi}{3}\right)$ and $y_2 = 0.1\cos \pi t.$ The phase difference of the velocity of particle $1$ with respect to the velocity of particle $2$ is

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time period of oscillation would

A projectile can have the same range $R$ for two angles of projection. If $t_1$ and $t_2$ be the times of flights in the two cases, then the product of the two time of flights is proportional to

A particle is moving eastwards with a velocity of 5 m/s. In 10 seconds the velocity changes to 5 m/s northwards. The average acceleration in this time is

A thin glass (refractive index $1.5$) lens has optical power of $-5\ D$ in air. Its optical power in a liquid medium with refractive index $1.6$ will be

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is $\frac{4}{3}$ and the fish is $12\text{ cm}$ below the surface, the radius of this circle in $\text{cm}$ is

The moment of inertia of a uniform semicircular disc of mass $M$ and radius $r$ about a line perpendicular to the plane of the disc through the center is

An annular ring with inner and outer radii $R_1$ and $R_2$ is rolling without slipping with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, $\frac{F_1}{F_2}$ is

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480\text{ nm}$ is incident on it. The band gap in $(\text{eV})$ for the semiconductor is

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

In a full wave rectifier circuit operating from $50\,Hz$ mains frequency, the fundamental frequency in the ripple would be

A $20\text{ cm}$ long capillary tube is dipped in water. The water rises up to $8\text{ cm.}$ If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

A system goes from $A$ to $B$ via two processes $I$ and $II$ as shown in figure. If $\Delta U_1$ and $\Delta U_2$ are the changes in internal energies in the processes $I$ and $II$ respectively, then

A gaseous mixture consists of $16\text{ g}$ of helium and $16\text{ g}$ of oxygen. The ratio $\frac{C_p}{C_v}$ of the mixture is

Out of the following pair, which one does NOT have identical dimensions is

When two tuning forks (fork $1$ and fork $2$) are sounded simultaneously, $4$ beats per second are heated. Now, some tape is attached on the prong of the fork $2$ When the tuning forks are sounded again, $6$ beats per second are heard. If the frequency of fork $1$ is $200\text{ Hz}$, then what was the original frequency of fork $2$?

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

If $I_0$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?

When an unpolarized light of intensity $I_0$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

Two point white dots are $1\text{ mm}$ apart on a black paper. They are viewed by eye of pupil diameter $3\text{ mm}.$ Approximately, what is the maximum distance at which these dots can be resolved by the eye? [ Take wavelength of light $= 500\text{ nm}$ ]

A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

A spherical ball of mass $20\text{ kg}$ is stationary at the top of a hill of height $100\text{ m}$. It rolls down a smooth surface to the ground, then climbs up another hill of height $30\text{ m}$ and finally rolls down to a horizontal base at a height of $20\text{ m}$ above the ground. The velocity attained by the ball is

The upper half of an inclined plane with inclination $\phi$ is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

A body of mass $m$ is accelerated uniformly from rest to a speed $v$ in a time $T.$ The instantaneous power delivered to the body as a function of time is given by

A bullet fired into a fixed target loses half of its velocity after penetrating $3\text{ cm}$ How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?