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1996 Physics
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(1) 12.5 mg (2) Zero (3) 50 mg (4) 25 mg |
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| 2. | The magnetic field at the centre of one loop of a circular wire of radius r carrying current i may be taken as B0. If a particle of charge q passes the centre of a semi-circular wire, as shown below, along the axis of the wire, the force on it due to the current (with v as the particle speed) is. |
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(1) 1/4 q B0v (2) q B0 v (3) zero (4) 1/2 qB0V |
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| 3. | A 10 µF capacitor is charged by a battery of e.m.f 100 volts. The energy stored in the capacitor is |
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(1) 0.5 mJ (2) 0.05 mJ (3) 0.05 J (4) 0.J |
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| 4. | As the electron in Bohr orbit of hydrogen atom passes from state n = 2 to n = 1, the kinetic energy K and the potential energy U change as: |
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(1) K four-fold, U two- fold (2) K two-fold, U four-fold (3) K two-fold, U also two-fold (4) K four-fold, U also four-fold. |
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| 5. | Suppose a tunnel is dug along the diameter of the earth. A particle is from a point distance h directly above the tunnel. The earth's density is assumed uniform and the friction is neglected. Then: |
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(1) The acceleration on the particle
will be maximum just at the point of release. (2) The particle will drop to the centre of the earth. (3) The particle will have harmonic oscillation. (4) The particle will have maximum speed when passing through the centre of the earth. |
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| 6. | The door of a domestic refrigerator is kept open while the switch is on, Then the room will |
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(1) Get heated for sometime, cooled
for sometime (2) Get neither heated nor cooled (3) Get heated (4) Get cooled |
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| 7. | Which of the following diagrams shows correctly the dispersion of white light by a prism? |
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(1)
(2) (3) (4) |
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| 8. | Unpolarised light converts to partially or plane polarised light by many processes. which of the following does not do that? |
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(1) Double refraction
(2) Scattering (3) Reflection (4) Diffraction. |
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| 9. | In the circuit below, capacitors A and B have Identical geometry, but a material of dielectric constant 3 is present between the plates of B. The potential difference across A and B respectively: |
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(1) 7.5 V. 2.5 V (2) 8 V, 2 V (3) 2.5 V, 7.5 V (4) 2 V, 8 V |
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| 10. | Figures below show four ways of making a regular hexagon out of wires of two different kinds P, Q with current beads at the middle of opposite wires, the magnetic field at the centre of the hexagon is not zero in: |
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(1) Case c only (2) Cases c and d only (3) Case a only (4) Case a and b only |
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| 11. | Just as electricity is supplied at 220 V for domestic use in India, It is supplied at 110 V in U.S. A. If resistance of 60 W bulb for use in India is R, that of a 60 W bulb for use in U.S.A. will be: |
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(1) R
(2) 2R (3) R/4 (4) R/2 |
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| 12. | Which of the following is correct ? |
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(1) Light and solid are both
transverse waves. (2) Coherent source of light passing through two slits causes interference. (3) Interference of light is evidence for transverse character of light. (4) Rainbow appears because of scattering of light. |
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| 13. | Electric current arises from the flow of charged particles, Now: |
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(1) In electrolytes, It is mainly
due to the flow of negative ions. (2) In discharge tubes containing gases at low pressure, it is due to the flow of positive ions only (3) In metals, it is mainly due to the flow of electrons. (4) In semi-conductors, it is mainly due to the flow of holes. |
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| 14. | Which of the following demonstrates that earth has a magnetic field? |
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(1) Earth is a planet rotating about
the North-South axis. (2) The intensity of cosmic rays (stream of charged particles coming particle coming from outer space) is more at the poles than at the Equator. (3) A large quantity of iron-ore is found in the earth. (4) The earth is surrounded by an ionosphere (a shell of charged particles) |
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| 15. | In a nuclear reactor: |
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(1) Ordinary water moderates the
activity of the reactor. (2) The fuel used is natural uranium which is mostly uranium 235. (3) The chain reaction is kept under control by rods of cadmium, whose going in reduces the reaction rate. (4) The thick concrete shield is used to slow down the speed of neutrons. |
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| 16. | Given P = 0.0030 m., Q = 2.40 m and R = 3,000 m., the number of significant figures in P, Q and R are respectively. |
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(1) 4, 2, 1 (2) 4, 2, 4 (3) 2, 2, 1 (4) 2, 3, 4 |
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| 17. | A hollow sphere is held suspended, Sand is now poured it in stages, The centre of gravity of the sphere with the sand: |
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(1) First rises and then falls to
the original position. (2) First falls and then rises to the original position. (3) Rises continuously (4) Remains unchanged in the process. |
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| 18. | Shown in the figure is a convergent lens placed inside a cell filled with a liquid. The lens has a focal length + 20 cm. when in air and it material has a refractive index 1.50. If the liquid has a refractive index 1.60, the focal length of the system is: |
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(1) -24 cm
(2) -100 cm (3) + 80 cm (4) - 80 cm |
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| 19. | In the circuit shown below, every resistance has a value of 24 ohm. The resistance between terminals P and Q is: |
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(1) 32 ohm (2) 42 ohm (3) 26 ohm (4) 36 ohm |
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| 20. | In terms of Rydberg constant R, the shortest wavelength in Balmer series of hydrogen atom spectrum will have wavelength: |
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(1) 3/2 R (2) 9/4 R (3) 1/R (4) 4/R |
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| 21. | Consider the following statements about dimensions : |
| P: Force = acceleration due to gravity x mass | |
| Q :Electric charge = current x time | |
| R : Magnetic flux = Electric voltage x time | |
| The correct statements are: | |
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(1) R, P only (2) P, Q and R (3) P, Q only (4) Q, R only |
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| 22. | The decimal number 53 is equal to the binary number: |
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(1) 10 11 01 (2) 11 01 01 (3) 11 11 11 (4) 10 10 10 |
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| 23. | The figure represents: |
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(1) n-p-n transistor (2) p-n-p transistor (3) Amplifier (4) Diode |
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| 24. | A satellite in a circular orbit of radius R has a period of 4 hours. A satellite with orbital radius of 4 R around the same planet will have a period : |
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(1) 32 hours (2) 64 hours (3) 8 hours (4) 16 hours |
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| 25. | At the mid-point along the length of a long solenoid, the magnetic field is equal to x, If the length of the solenoid is doubled and the current is reduced to half, the field at the new mid-point will be nearest to: |
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(1) x/2 (2) x/4 (3) x (4) 2x |
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| 26. | A body thrown upwards reaches a height and comes back. Which of the following is true about the acceleration due to gravity? |
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(1) It remains constant throughout (2) It varies but never changes sign (3) It varies continuously with the maximum at the beginning and zero at the top. (4) It only changes sign when the body is at the top. |
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| 27. | When light passes from one medium to another, there is a change in: |
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(1) Wavelength and velocity (2) Frequency, wavelength and velocity (3) Frequency and velocity (4) Frequency and wavelength. |
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| 28. | In a mixture of ideal gases, the molecules have the same: |
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(1) Mean translational kinetic
energy (2) Root mean square momentum (3) Speed (4) Mean speed. |
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| 29. | An ideal gas has a volume of 3 l at 2 atom pressure. Keeping the temperature constant, the pressure is doubled. Then the volume of the gas will be: |
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(1) 1.5 l (2) any value (3) 3 l (4) 6 l |
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| 30. | The velocity of light in a medium is 2 x 108 m /s. The refractive index of the medium is: |
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(1) 1.0 (2) 1.5 (3) 1.4 (4) 2.3 |
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| 31. | Distances of stars is measured in: |
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(1) Light years (2) Cosmic kilometer (3) Stellar mile (4) Galactic unit |
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| 32. | Sky seen from earth appears blue because of: |
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(1) Scattering of light
(2) Refraction of light (3) Reflection of light (4) Polarization of light |
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| 33. | Optical fibres work on the principle of: |
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(1) Total internal reflection (2) Scattering (3) Refraction (4) Reflection |
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| 34. | A red flower seen through a green glass looks: |
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(1) Green (2) Black (3) Yellow (4) Red |
| 35. | The relation between velocity (v), frequency (f) and wavelength (l ) is given by |
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(1) f = vl
(2) f = v/ l2 (3) V = fl (4) v = f/l |
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| 36. | Magnetic lines of force: |
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(1) Intersect at infinity (2) Never intersect (2) Intersect at neutral points (4) Intersect near through or the south pole. |
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| 37. | The electric field intensity due to a hollow charged spherical conductor is maximum: |
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(1) At any point inside the sphere (2) Only at the centre of the sphere (3) Outside the sphere (4) On the surface of the sphere |
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| 38. | 1,000 drops of water of radius 1 cm. each carrying a charge of 10 esu combine to the form a single drop. The capacitance of the combined drop increases: |
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(1) 100 times
(2) 1,000 times (3) 1 time (4) 10 times. |
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| 39. | Four resistances of 100 ohm each are connected in the form of a square. Then the effective resistance along the diagonal points is: |
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(1) 150 ohms (2) 100 ohms (3) 400 ohms (4) 200 ohms |
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| 40. | An electron in motion is associated with : |
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(1) Both electric and magnetic fields (2) Either electric or magnetic field (3) Only an electric field (4) Only a magnetic field. |
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| 41. | Two parallel wires carry electric current in the same direction. The wires: |
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(1) Do not attract or repel (2) Oscillate (3) Attract each other (4) Repel each other. |
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| 42. | The direction of force acting on a current carrying conductor at right angles to a magnetic field is given by: |
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(1) Maxwell's right - handed cork
screw rule (2) Ampere's swimming rule (3) Fleming's left hand rule (4) Fleming's right hand rule |
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| 43. | A motor: |
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(1) Converts electrical energy into
magnetic energy (2) Creates mechanical energy (3) Converts electrical energy into mechanical energy (4) Converts mechanical energy into electrical energy |
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| 44. | The resistance of an ideal ammeter is: |
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(1) Very high (2) Infinite (3) Zero (4) Small |
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| 45. | Good resistance coils are made of: |
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(1)
Silver (2) Gold (3) Manganin (4) Copper |
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| 46. | When a metal is heated, its resistance: |
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(1) Remains constant (2) May increase or decrease (3) Increases (4) Decreases |
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| 47. | An example of a non-ohmic device is: |
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(1) Triode (2) Potentiometer wire (3) Copper wire (4) Platinum resistance thermometer. |
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| 48. | The statement "Algebraic sum of the currents meeting at a mode is zero" is : |
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(1) Kirchhoff's law (2) Faraday's law (3) Lenz's law (4) Ampere's law |
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| 49. | The compensating leads are provided in a platinum resistance thermometer. This is to: |
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(1) Provide compensation for the
resistance of the leads (2) Protect the thermometer (3) Provide fourth arm in the bridge (4) Compensate for the change in the resistance of the platinum coil. |
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| 50. | A 4 - v battery of internal resistance 1 ohm sends a current through a 3- ohm resistor. The terminal p.d. is: |
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(1) 0.75 V (2) 1 V (3) 1.33 V (4) 3 V |
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| 51. | The number of neutrons in a 92U235 nucleus is: |
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(1) 327
(2) 143 (3) 92 (4) 235 |
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| 52. | When an electron and a position collide: |
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(1) The mass is not converted into
energy (2) They Repel each other (3) The total mass is converted into energy (4) Part of the mass is converted into energy |
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| 53. | A diode can be used for: |
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(1) Rectification
(2) Detection (3) Modulation (4) Amplification |
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| 54. | The n-type semi-conductor is: |
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(1) Germanium doped with aluminum (2) Silicon doped with indium. (3) Germanium doped with arsenic (4) Germanium doped with indium. |
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| 55. | In a good conductor the energy gap between the conduction band and valence band is: |
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(1) Wide (2) Infinite (3) Zero (4) Narrow |
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| 56. | The rest mass of a photon is: |
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(1) Dependant on velocity
(2) Zero (3) Very large (4) Very small |
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| 57. | The Avogadro number is: |
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(1) 6.5 x 10-27 (2) 6.02 x10-23 (3) 6.02 x 1023 (4) 6.25 x 1027 |
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| 58. | The units of Planck's constant are: |
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(1) Js2 (2) J/s (3) Js-2 (4) Js |
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| 59. | In the reaction 1H2 + 1H2 ® 2He4 + x, x is: |
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(1) Neutron (2) Photon (3) Proton (4) Electron |
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| 60. | The main source of energy in the sun and the stars is: |
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(1) Fission and fusion reactions (2) None of the above (3) Fission reactions (4) Fusion reactions |
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