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Physics · 2005 · Shift 0

68 questions from this JEE Main paper

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2005 · Shift 0
Physics

Physics · 2005 · Shift 0

68 questions from this JEE Main paper

Electronic Devices2 questions Atoms and Nuclei2 questions Dual Nature of Radiation2 questions Geometrical Optics2 questions Current Electricity7 questions Magnetics4 questions Magnetic Properties of Matter1 questions Alternating Current3 questions Electromagnetic Induction2 questions Wave Optics4 questions Simple Harmonic Motion4 questions Gravitation3 questions Properties of Matter2 questions Laws of Motion4 questions Center of Mass4 questions Heat and Thermodynamics5 questions Waves1 questions Electrostatics3 questions Capacitor2 questions Units and Measurements1 questions Motion in A Straight Line3 questions Motion in A Plane1 questions Work Power and Energy4 questions Rotational Motion2 questions

Q116.In a full wave rectifier circuit operating from $50 H z$ mains frequency, the fundamental frequency in the ripple would be
Physics · Electronic Devices · MCQ
Q117.A nuclear transformation is denoted by $X (n, α) 73 L i .$ Which of the following is the nucleus of element $X$ ?
Physics · Atoms and Nuclei · MCQ
Q118.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? Includes diagram
Physics · Atoms and Nuclei · MCQ
Q119.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
Physics · Dual Nature of Radiation · MCQ
Q120.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 $12 c m$ below the surface, the radius of this circle in $c m$ is
Physics · Geometrical Optics · MCQ
Q121.Two sources of equal $e m f$ are connected to an external resistance $R .$ The internal resistance of the two sources are $R_{1}$ and $R_{2} (R_{1} > R_{1}) .$ If the potential difference across the source having internal…
Physics · Current Electricity · MCQ
Q122.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 $o hm s$ …
Physics · Current Electricity · MCQ
Q123.The resistance of hot tungsten filament is about $10$ times the cold resistance. What will be resistance of $100 W$ and $200 V$ lamp when not in use ?
Physics · Current Electricity · MCQ
Q124.An energy source will supply a constant current into the load if its internal resistance is
Physics · Current Electricity · MCQ
Q125.Two concentric coils each of radius equal to $2 π c m$ 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 / $m^{2}$ at the center of the…
Physics · Magnetics · MCQ
Q126.A magnetic needle is kept in a non-uniform magnetic field. It experiences :
Physics · Magnetic Properties of Matter · MCQ
Q127.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
Physics · Magnetics · MCQ
Q128.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
Physics · Magnetics · MCQ
Q129.The self inductance of the motor of an electric fan is $10 H$ . In order to impart maximum power at $50 H z$ , it should be connected to a capacitance of
Physics · Alternating Current · MCQ
Q130.A coil of inductance $300 m H$ and resistance $2 Ω$ is connected to a source of voltage $2 V$ . The current reaches half of its steady state value in
Physics · Electromagnetic Induction · MCQ
Q131.A circuit has a resistance of $12 o hm$ and an impedance of $15 o hm$ . The power factor of the circuit will be
Physics · Alternating Current · MCQ
Q132.The phase difference between the alternating current and $e m f$ is $\frac{π}{2} .$ Which of the following cannot be the constituent of the circuit?
Physics · Alternating Current · MCQ
Q133.Two point white dots are $1 mm$ apart on a black paper. They are viewed by eye of pupil diameter $3 mm .$ Approximately, what is the maximum distance at which these dots can be resolved by the eye? [ Take wavelength of light $= 500 nm$ ]
Physics · Wave Optics · MCQ
Q134.A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
Physics · Wave Optics · MCQ
Q135.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
Physics · Geometrical Optics · MCQ
Q136.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?
Physics · Wave Optics · MCQ
Q137.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
Physics · Wave Optics · MCQ
Q138.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… Includes diagram
Physics · Electromagnetic Induction · MCQ
Q139.The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480 nm$ is incident on it. The band gap in $(e V)$ for the semiconductor is
Physics · Electronic Devices · MCQ
Q140.If the kinetic energy of a free electron doubles, it's deBroglie wavelength changes by the factor
Physics · Dual Nature of Radiation · MCQ
Q141.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 - Includes diagram
Physics · Current Electricity · MCQ
Q142.Two simple harmonic motions are represented by the equations $y_{1} = 0.1 sin (100 π t + \frac{π}{3})$ and $y_{2} = 0.1 cos π t .$ The phase difference of the velocity of particle $1$ with respect to the velocity…
Physics · Simple Harmonic Motion · MCQ
Q143.Average density of the earth
Physics · Gravitation · MCQ
Q144.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
Physics · Properties of Matter · MCQ
Q145.A $20 c m$ long capillary tube is dipped in water. The water rises up to $8 c m .$ If the entire arrangement is put in a freely falling elevator the length of water column in the capillary tube will be
Physics · Properties of Matter · MCQ
Q146.A block is kept on a frictionless inclined surface with angle of inclination $^{'} α^{'} .$ The incline is given an acceleration $a$ to keep the block stationary. Then $a$ is equal to Includes diagram
Physics · Laws of Motion · MCQ
Q147.The block of mass $M$ moving on the frictionless horizontal surface collides with the spring of spring constant $k$ and compresses it by length $L .$ The maximum momentum of the block after collision is Includes diagram
Physics · Center of Mass · MCQ
Q148.A mass $^{'} m^{'}$ moves with a velocity $^{'} v^{'}$ and collides inelastically with another identical mass. After collision the $1^{s t}$ mass moves with velocity $\frac{v}{3}$ in a direction perpendicular to the initial direction of… Includes diagram
Physics · Center of Mass · MCQ
Q149.A gaseous mixture consists of $16 g$ of helium and $16 g$ of oxygen. The ratio $\frac{C p}{C _{v}}$ of the mixture is
Physics · Heat and Thermodynamics · MCQ
Q150.Which of the following is incorrect regarding the first law of thermodynamics?
Physics · Heat and Thermodynamics · Multiple correct
Q151.A T shaped object with dimensions shown in the figure, is lying on a smooth floor. A force $^{'} F^{'}$ is applied at the point $P$ parallel to $A B,$ such that the object has only the translational motion without… Includes diagram
Physics · Center of Mass · MCQ
Q152.A system goes from $A$ to $B$ via two processes $I$ and $I I$ as shown in figure. If $Δ U_{1}$ and $Δ U_{2}$ are the changes in internal energies in the processes $I$ and $I I$ respectively, then Includes diagram
Physics · Heat and Thermodynamics · MCQ
Q153.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… Includes diagram
Physics · Heat and Thermodynamics · MCQ
Q154.The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is Includes diagram
Physics · Heat and Thermodynamics · MCQ
Q155.The function $sin^{2} (ω t)$ represents
Physics · Simple Harmonic Motion · MCQ
Q156.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
Physics · Simple Harmonic Motion · MCQ
Q157.If a simple harmonic motion is represented by $\frac{d ^{2} x}{d t ^{2}} + α x = 0.$ its time period is
Physics · Simple Harmonic Motion · MCQ
Q158.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…
Physics · Waves · MCQ
Q159.Two point charges $+ 8 q$ and $- 2 q$ 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
Physics · Electrostatics · MCQ
Q160.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
Physics · Capacitor · MCQ
Q161.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
Physics · Electrostatics · MCQ
Q162.A charged ball $B$ hangs from a silk thread $S,$ which makes angle $θ$ with a large charged conducting sheet $P,$ as shown in the figure. The surface charge density $σ$ of the sheet is proportional to f Includes diagram
Physics · Electrostatics · MCQ
Q163.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…
Physics · Capacitor · MCQ
Q164.Two thin, long, parallel wires, separated by a distance $^{'} d^{'}$ carry a current of $^{'} i^{'} A$ in the same direction. They will
Physics · Magnetics · MCQ
Q165.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
Physics · Current Electricity · MCQ
Q166.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 $Z_{1}$ …
Physics · Current Electricity · MCQ
Q167.A particle of mass $10 g$ is kept on the surface of a uniform sphere of mass $100 k g$ and radius $10 c m .$ Find the work to be done against the gravitational force between them to take the particle far away from the sphere (you may take $G = 6.67 \times 1 0^{- 11} N m^{2} / k g^{2}$ …
Physics · Gravitation · MCQ
Q168.Out of the following pair, which one does NOT have identical dimensions is
Physics · Units and Measurements · MCQ
Q169.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
Physics · Motion in A Straight Line · MCQ
Q170.The relation between time t and distance x is t = ax2 + bx where a and b are constants. The acceleration is
Physics · Motion in A Straight Line · MCQ
Q171.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
Physics · Motion in A Plane · MCQ
Q172.A parachutist after bailing out falls $50 m$ without friction. When parachute opens, it decelerates at $2 m / s^{2} .$ He reaches the ground with a speed of $3 m / s$ . At what height, did he bail out?
Physics · Motion in A Straight Line · MCQ
Q173.A bullet fired into a fixed target loses half of its velocity after penetrating $3 c m .$ How much further it will penetrate before coming to rest assuming that it faces constant resistance to motion?
Physics · Work Power and Energy · MCQ
Q174.A smooth block is released at rest on a $4 5^{\circ}$ 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
Physics · Laws of Motion · MCQ
Q175.A particle of mass 0.3 kg subjected to a force $F = - k x$ with $k = 15 N / m$ . What will be its initial acceleration if it is released from a point 20 cm away from the origin?
Physics · Laws of Motion · MCQ
Q176.Consider a car moving on a straight road with a speed of $100 m / s$ . The distance at which car can be stopped is $[μ_{k} = 0.5]$
Physics · Laws of Motion · MCQ
Q177.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, $\frac{F _{1}}{F _{2}}$ …
Physics · Rotational Motion · MCQ
Q178.The upper half of an inclined plane with inclination $ϕ$ 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…
Physics · Work Power and Energy · MCQ
Q179.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
Physics · Work Power and Energy · MCQ
Q180.A spherical ball of mass $20 k g$ is stationary at the top of a hill of height $100 m$ . It rolls down a smooth surface to the ground, then climbs up another hill of height $30 m$ and finally rolls down to a horizontal base at a height of $20 m$ …
Physics · Work Power and Energy · MCQ
Q181.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
Physics · Rotational Motion · MCQ
Q182.A body $A$ of mass $M$ while falling vertically downloads 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…
Physics · Center of Mass · MCQ
Q183.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…
Physics · Gravitation · MCQ