IIT JEE Physicss 2001
- 1. IITJEE–Past papersPHYSICS - UNSOLVED PAPER - 2001
- 2. SECTION – ISingle Correct Answer TypeSelect the correct choice amongst the given alternative answers.
- 3. 01ProblemThree positive charges of equal value q are placed at the vertices of an equilateral triangle. The resulting lines of force should be sketched as ina. b.c. d.
- 4. Problem02When a block of iron floats in mercury at 0 oC ,a fraction k1 of its volume is submerged, while at the temperature 60 oC ,a fraction k2 is seen to be submerged. If the coefficient of volume expansion of iron is and that of mercury is ,then the ratio k1 /k2 can be expressed asa.b.c.d.
- 5. Problem03Three rods made of the same material and having the same cross-section have joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0 oC and 90oC respectively. The temperature of the junction of the three rods will be a.45oCb.60oCc.30oCd.20oC
- 6. Problem04In a given process on an ideal gas ,dW=0 and .Then for the gasthe temperature will decreasethe volume will increasethe pressure will remain constantthe temperature will increase
- 7. Problem05The electron emitted in beta radiation originates frominner orbits of atomsfree electrons existing in nucleidecay of a neutron in a nucleusphoton escaping from the nucleus
- 8. Problem06The transition from the state n=4 to n=3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transitiona.b.c.d.
- 9. Problem07In the given circuit, with steady current, the potential drop across the capacitor must beVV/2V/32V/3
- 10. 08ProblemThe intensity of X-rays from a Coolidge tube is plotted against wavelength λas shown in the figure. The minimum wavelength found is λc and the wavelength of the Ka line is λx .As the accelerating voltage is increasedλx - λc increasesλx - λc decreasesλx increasesλx decreases
- 11. Problem09Two beams of light having intensities interfere to produce a fringe pattern on a screen. The phase difference between the beams is π/2at point A and π at point B. Then the difference between the resultant intensities at A and B isa.b.c.d.
- 12. Problem10a non-planar loop of conducting wire carrying a current is placed as shown in the figure. Each of the straight sections of the loop is of length 2a.The magnetic field due to this loop at the point p(a,0,a) points in the directiona.b.c.d.
- 13. Problem11A particle executes simple harmonic motion between .The time taken for it to go from 0 to A/2 is T1 and to go from A/2 to A is T2 .Thena.b.c.d.
- 14. 12ProblemIn a Young’s double slit experiment,12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by12182430
- 15. Problem13One quarter sector is cut from a uniform circular disc of radius Roth's sector has mass Mitt is made to rotate about a line perpendicular to its plane and passing through the center of the original disc .Its moment of inertia about the axis of rotation isa.b.c.d.
- 16. Problem14Two particles of masses in projectile motion have velocities respectively at t=0.Their velocities becomes at time while still moving in air. The value of is Zerob.c.d.
- 17. Problem15A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the tracks is the same in all cases. At the highest point of the track, the normal reaction is maximum ina. b.c. d.
- 18. Problem16A simple pendulum has a time period T1 when on the earth’s surface, and T2 when taken to a height R above the earth’s surface, where R is the radius of the earth .The value of T1 / T2 is1√242
- 19. 17ProblemTwo particles A and B of masses respectively and having the same charge are moving in a plane A uniform magnetic field exists perpendicular to this plane.The speeds of the particles are respectively and the trajectories are as shown in the figure. Then a.b.c.d.
- 20. Problem18Two circular coils can be arranged in any of the three situations shown in the figure. Their mutual inductance will bea. b. c.maximum in situation(a)maximum in situation(b)maximum in situation (c)the same in all situations
- 21. Problem19A ray of light passes through four transparent media with refractive indices as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must havea.b.c.d.
- 22. Problem20A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to the current ,the temperature of the wire is raised by in a time t.A number N of similar cells is now connected in series with a wire of the same material and cross section but the length 2L.The temperature of the wire is raised by the same amount in the same time t. The value of N is4689
- 23. Problem21A given ray of light suffers minimum deviation in an equilateral prism P.Additional prisms Q and R of identical shape and of the same material as P are now added as shown in the figure. The ray will now suffergreater deviationno deviationsame deviation as beforetotal internal reflection
- 24. Problem22Two pulses in a stretched string whose centers are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will bezeropurely kineticpurely potentialpartly kinetic and partly potential
- 25. Problem23P-V plots for two gases during adiabatic processes are shown in the figure. plots 1 and 2 should correspond respectively to a.b.c.d.
- 26. Problem24A hemispherical portion of radius R is removed from the bottom of a cylinder of radius R.The volume of the remaining cylinder is V and its mass is M. It is suspended by a string in a liquid of density where it stays vertical .The upper surface of the cylinder is at depth h below the liquid surface. The force on the bottom of the cylinder by the liquid isa.b.c.d.
- 27. Problem25The ends of a stretched wire of length L are fixed at .In one experiment, the displacement of the wire is and energy is .Then a.b.c.d.
- 28. Problem26An insect crawls up a hemispherical surface very slowly (see the figure).The coefficient of friction between the insect and the surface is 1/3.If the line joining the center of the hemispherical surface to the insect makes an angle with the vertical, maximum possible value of is given bya.b.c.d.
- 29. Problem27The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle should bea.0ob.30oc.45od.60o
- 30. Problem28A string of negligible mass gong over a clamed pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given bya.b.c.d.
- 31. Problem29A quantity X is given by is the permittivity of free space, L is a length, is potential difference and is a time interval. The dimensional formula for X is the same as that of resistance chargevoltagecurrent
- 32. Problem30Consider the situation shown in the figure. The capacitor A has a charge q on it whereas B is uncharged. The charge appearing on the capacitor B a long time after the switch is closed iszeroq/2q2q
- 33. Problem.31A uniform electric field pointing in positive x-direction exists in a region. Let A be the origin be the point on the at and C be the point on the at .then the potentials at the points A,B and C satisfy:a.b.c.d.
- 34. Problem32A coil having n turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current passes through the coil, the magnetic field at the center isa.b.c.d.
- 35. Problem33A radioactive sample consists of two distinct species having equal number of atoms initially. The mean life time of one species is and that of the other is 5 .The decay products in both cases are stable. A plot is made of the total number of radioactive nuclei as a function of time. Which of the following figures best represents the form of this plot?a.b.c.d.
- 36. Problem34In the given circuit it is observed that the current is independent of the value of the resistance .Then the resistance values must satisfya.b.c.d.
- 37. Problem35A metallic square loop ABCD is moving in its own plane with velocity in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is inducedin AD, but not BCin BC, but not in ADneither in AD nor in BCin both AD and BC
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Editor's Notes
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