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IIT JEE Physics 2005

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• IIT JEE Physics 2005

1. 1. IIT JEE –Past papers<br />PHYSICS - UNSOLVED PAPER - 2005<br />
2. 2. SECTION – I<br />Single Correct Answer Type<br /><ul><li>This section contains 25 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.</li></li></ul><li>01<br />Problem<br />A cubical block is held stationary against a rough wall by applying force F as shown in Fig.2005.1. The incorrect statement among the following is<br />frictional force , <br />normal force , <br />normal force does not apply torque<br />force F does not apply torque<br />
3. 3. Problem<br />02<br />A circular disc of radius r/3 is removed from a bigger circular disc of mass 9M and radius r as shown in Fig.2005.2.The moment of inertia of the remaining portion of the disc about the centre O of disc perpendicular to the plane of the disc is<br />a.<br />b.<br />c.<br />d.<br />
4. 4. Problem<br />03<br />Which of the following acceleration-distance graphs corresponds to the velocity-distance graph shown is Fig.2005.3?<br />a.<br />b.<br />c.<br />d.<br />
5. 5. Problem<br />04<br />A steel ball is confined to rotate in a circular path with its speed decreasing due to friction. Which of the following statements is correct for the ball?<br />Its acceleration is towards the centre<br />The ball moves towards centre of circle in a spiral path<br />Its angular momentum about the centre is conserved<br />Only the direction of angular momentum is conserved<br />
6. 6. Problem<br />05<br />A simple pendulum attached to the ceiling of a stationary lift has a time period T. When the lift moves upward with distance covered as the time period of the pendulum will be equal to<br />a.<br />b.<br />c.<br />d.<br />
7. 7. Problem<br />06<br />Two liters of water (density=1gmL)in an open-lid insulated kettle is heated by an electric heater of power 1k.W.The heat Is lost from the lid at the rate of 160J/s .The time taken for heating water(specific heat capacity )from 20 to 75 is<br />340 s<br />550 s<br />620 s<br />760 s<br />
8. 8. Problem<br />07<br />One mole of a monatomic ideal gas is contained in an insulated and rigid container. It is heated through a filament of resistance 100 through a current of 2 A for 10 min .The change in the internal energy of the gas is <br />30 kJ<br />60 kJ<br />120 kJ<br />240 kJ<br />
9. 9. 08<br />Problem<br />One calorie is defined as the heat required to raise the temperature of 1g of water by 1 at 1 atm pressure in the temperature range of?<br />9.5 to 10.5 <br />13.5 to 14.5 <br />14.5 to 15.5 <br />98.5 to 99.5 <br />
10. 10. Problem<br />09<br />A long cylindrical tank has a hole at height 0.50 m from the bottom .The ratio of cross sectional area of the cylinder to that of the hole is 10.If the tank is filled with water upto the level of 3m from the bottom, the square of velocity with which water comes out of the hole is<br />a.<br />b.<br />c.<br />d.<br />
11. 11. Problem<br />10<br />The graphs in Fig.2005.4 display the energy density versus wave length of the emitted radiations from three sources, namely, sun welding arc and tungsten filament. The graphs correspond to<br />1-Sun,2-Welding arc,3-Tungsten<br />1-Welding arc,2-Tungsten,3-Sun<br />1-Tungsten,2-Welding arc,3-Sun<br />1-Sun,2-Tungsten,3-Welding arc<br />
12. 12. Problem<br />11<br />Which of the following choices does not represent the same dimensions of the mentioned physical quantities?<br />Heat ,potential energy and work<br />Electric flux, electric field and electric dipole moment<br />Pressure, stress and Young’s modulus<br />Potential difference, voltage and electromotive force of a galvanic cell<br />
13. 13. 12<br />Problem<br />A spherical body of area A and emissivity e=0.55 placed inside a perfectly black body is maintained at temperature Tithe energy radiated per unit time by the body is<br />0.45 <br />0.50 <br />0.55 <br />0.55 <br />
14. 14. Problem<br />13<br />In a resonance tube with tuning fork of frequency 480 Hz, first resonance occurs at water level equal to 30.2 cm and second resonance occurs at 63.5cm.The maximum possible error in the speed of sound is<br />182.0 cm<br />187.0 cm<br />192.0 cm<br />197.0 cm<br />
15. 15. Problem<br />14<br />An open pipe resonates at second harmonic at frequency . One end of the pipe is closed and the frequency is gradually increased till it resonates at nth harmonic when the frequency is . Which of the following conditions holds good?<br />a.<br />b.<br />c.<br />d.<br />
16. 16. Problem<br />15<br />A thin concave lens is in contact with a thin convex lens. The ratio of their magnitude of powers is 2/3 and the focal length of the combined lens is 30 cm.The focal lengths of the individual lenses are<br />-15 cm and +10 cm<br />-75 cm and +50 cm<br />-21 cm and +20 cm<br />-30 cm and +20 cm<br />
17. 17. Problem<br />16<br />A tank of height 33.25 cm is completely filled with a liquid of index of refraction 1.33.A concave mirror of focal length is placed 15.0 cm above the tank as shown in fig .2005.5 An object is placed at the bottom of the tank on the axis of concave mirror and its image is formed at a distance 25.0 cm below the surface of the loquid.The focal length of the mirror is<br />10.0 cm<br />18.3 cm<br />20.3 cm<br />25.0 cm<br />
18. 18. 17<br />Problem<br />In a Young’s double slit experiment an electron beam is used to obtain interference pattern. If the speed of electrons is decreased then<br />no interference pattern is observed <br />distance between two consecutive fringes decreases<br />distance between two consecutive fringes increases<br />distance between two consecutive fringes remains the same<br />
19. 19. Problem<br />18<br />In a Young’s double-slit experiment (Fig.2005.6),the angular position of a bright fringe having intensity one fourth of the maximum intensity is given by<br />a.<br />b.<br />c.<br />d.<br />
20. 20. Problem<br />19<br />Which of the following processes does not involve convection of heat?<br />Heating of glass bulb through filament<br />Boiling of water<br />Land breeze and sea breeze<br />Heating of a room by heater<br />
21. 21. Problem<br />20<br />A galvanometer has a resistance of 100 and requires a current of 1.0 mA for full scale deflection. It is converted into an ammeter by introducing a shunt resistance of 0.1 .The minimum current in the circuit for maximum deflection is<br />10.1 mA<br />100.1 mA<br />1001 mA<br />999 mA<br />
22. 22. Problem<br />21<br />In the circuit shown in Fig.2005.7 the current passing through the resistance 4 is<br />zero<br />1 A<br />2 A<br />4A<br />
23. 23. Problem<br />22<br />Three infinitely charged sheets are kept parallel to each other in the x-y plane with charge densities as shown in Fig.2005.8.The electrical field at P is<br />a.<br />b.<br />c.<br />d.<br />
24. 24. Problem<br />23<br />A cylindrical conducting rod is kept with its axis along the x-axis. Also there exists a uniform magnetic field parallel to the x-axis. The current induced in the cylinder is<br />clockwise as seen from the +x-axis<br />anticlockwise as seen from the +x-axis<br />Along the axis towards –x direction<br />zero<br />
25. 25. Problem<br />24<br />A capacitor is connected through a resistor across a battery of negligible internal resistance as shown in Fig.2005.9.The time after which the potential difference across the capacitor becomes eight times to that of resistor is<br />18.0 s<br />20.0 s<br />22.0 s<br />24.0 s<br />
26. 26. Problem<br />25<br />A photon of energy 10.2 eV collides in elastically with a hydrogen atom in ground state.After a few microseconds another photon of energy 16.0eV collides in elastically with the same hydrogen atom .A suitable detector records <br />emission of 2 photons of energy 10.2 eV each<br />emission of 2 photons of energy 2.4 eV each<br />emission of 1 photon of energy 16.0 eV and an electron carrying energy 2.4 eV<br />emission of 2 photons of energy 10.2 eV and an electron carrying energy 2.4 eV<br />
27. 27. Problem<br />26<br />An element with atomic number 9 emits X-ray of wavelength .The atomic number of the element which emits X-ray of wavelength is <br />4<br />5<br />6<br />7<br />
28. 28. Problem<br />27<br />A star converts four helium nuclei into one oxygen nucleus .If atomic masses of helium and oxygen nuclei are 4.0026 amu and 15.9994 amu, respectively, the energy released per nucleus of oxygen formation is given by <br />zero<br />5.12 MeV<br />10.25 MeV<br />15.37 MeV<br />
29. 29. Problem<br />28<br />The volume of a monatomic gas is decreased by 10% on increasing its pressure from at constant temperature. If the compression is carried out adiabatically, the value of adiabatic bulk modules and the percent reduction in volume would be<br />a.<br />b.<br />c.<br />d.<br />
30. 30. FOR SOLUTION VISIT WWW.VASISTA.NET<br />