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1999 Physics
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(1) the network is not balanced (2) the galvanometer shows zero deflection (3) the galvanometer and the cell must be interchanged for balance (4) the network is still balanced. |
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| 2. | A cell is connected between the points A and C of a circular conductor ABCD of centre 'O' ÐAOC =600. If B1 and B2 are the magnitudes of the magnetic fields at O due to the currents in ABC and ADC respectively, the ratio B1/B2 is. |
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(1) 1/5 (2) 6 (3) 1 (4) 5 |
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| 3. | A short magnetic needle is pivoted in a uniform magnetic field of strength I T. When another magnetic field of strength Ö3 T is applied to the needle in a perpendicular direction, the needle deflects through an angle q, where q is |
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(1) 300 (2) 450 (3) 900 (4) 600 |
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| 4. | With a resistance R connected in series with a galvanometer of resistance 100 Ω, it acts as a voltmeter of range 0-V. To double the range a resistance of 1000 Ω is to be connected in series with R. Then the value of R is (Ω ) |
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(1) 1000 (2) 1100 (3) 800 (4) 900 |
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| 5. | When the radius of the T.G. coil is decreased, its sensitiveness |
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(1) remains unaltered (2) increases (3) may increase or decrease (4) decreases |
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| 6. | Property possessed by ferromagnetic substance only is : |
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(1) directional property
(2) attracting magnetic substances (3) hysteresis (4) susceptibility independent of temperature |
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| 7. | In a series LCR circuit R= 10 Ω and the impedance z= 20 Ω. Then the phase difference between the current and the voltage is |
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(1) 300 (2) 450 (3) 900 (4) 600 |
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| 8. | A device which converts electrical energy into mechanical energy is |
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(1) dynamo
(2) induction coil (3) electric motor (4) generator |
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| 9. | In an induction coil the emf induced in the secondary is maximum. |
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(1) at the break of the primary
circuit (2) either at the make or break of the primary circuit (3) neither at the make nor break of the primary circuit (4) at the make of the primary circuit |
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| 10. | Mass of a photon of frequency v is given by: |
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(1) m = hv2/c (2) m = hv/c (3) m = h/l (4) m = hv/c2 |
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| 11. | Solar spectrum is an example of |
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(1) band absorption spectrum (2) line absorption spectrum (3) continuous absorption spectrum (4) continuous emission spectrum |
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| 12. | Graph of maximum kinetic energy of the photo-electrons against v, the frequency of the radiation incident on the metal, is a straight line of slope equal to: |
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(1) h
(2) work function (3) stopping potential (4) h/e |
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| 13. | Relation between the stopping potential V0 of a metal and the maximum velocity v of the photoelectrons is |
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(1) v0 µ 1/v (2) v0 µ 1/v2 (3) v0 µ v2 (4) v0 µ v |
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| 14. | Ionisation energy of hydrogen atom is 13.6 eV. Then the energy required to ionise a hydrogen atom in which the electron in the second orbit from the nucleus is (eV): |
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(1) -13.6 (2) 3.4 (3) 10.2 (4) 13.6 |
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| 15. | If Ep and Ek are the potential energy and kinetic energy of the electron in a stationary orbit in the hydrogen atom, the value of Ep/Ek is |
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(1) -2 (2) 2 (3) 10 ` (4) 1 |
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| 16. | The number of atoms in a radioactive sample reduces from 1000 to 100 in two days. Then the number of atoms remaining at the end of four days is |
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(1) 25 (2) 20 (3) 10 (4) 50 |
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| 17. | Mean life of a radioactive elements is one year. Then it half life is (in years) |
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(1) 0.5 (2) 0.8 (3) 1 (4) 0.693 |
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| 18. | An electron and a proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is |
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(1) greater than the kinetic energy
of the proton (2) zero (3) infinity (4) equal to the kinetic energy of the proton |
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| 19. | Fertile material among the following is: |
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(1) Pu239 (2) U233 (3) U238 (4) U235 |
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| 20. | Region without free electrons and holes in a p-n function is |
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(1) p-region (2) n-region (3) junction (4) depletion region |
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| 21. | Least doped region in a transistor is |
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(1) collector (2) either emitter or collector (3) base (4) emitter |
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| 22. | A mirror forms a real image of unit manification. Its nature is |
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(1) concave (2) Plane (3) parabolic (4) convex |
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| 23. | A convex lens of refractive index n behaves as a convex lens of the smaller power in a liquid of refractive index n1 and as a concave lens in another liquid of refractive index n2. Then relation between n, n1 and n2 is: |
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(1) n > n1> n2 (2) n2 > n > n2 (3) n2 < n < n1 (4) n = n1= n2 |
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| 24. | For a prism of refractive index Ö3, the angle of the prism is equal to the angle of minimum deviation. The value of the angle of the prism is: |
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(1) 500 (2) 450 (3) 300 (4) 600 |
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| 25. | Two optical media of refractive indices n1 and n2 contains x and y waves of the same colour in the same thickness. Then their relative refractive index 1n2 is equal to: |
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(1) x/y - x (2) x - y (3) y/x (4) y - x/x |
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| 26. | Rays of light from a source of luminous intensity 40 cd are incident at 600 on a screen placed 2m from the source. Illumination produced on the screen is (lux) |
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(1) 10
(2) 20 (3) 30 (4) 5 |
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| 27. | Relation between temperature TK and volume V of a gas undergoing an adiabatic change is |
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(1) TVr = const (2) TVr-1 = const (3) TrV = const (4) TV = const |
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| 28. | Coefficient of superficial expansion of a solid is 2 x 10-5/0C. Its coefficient of linear expansion is: |
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(1) 3 x 10-5/0C (2) 1 x 10-5/0C (3) 2 x 10-5/0C (4) 4 x 10-5/0C |
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| 29. | Mode of transmission of heat in which heat is carried by moving particles is: |
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(1) radiation (2) wave motion (3) convection (4) conduction |
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| 30. | A force F=5i+6j-4k acting on a body produces a displacement S=6i+5k work done by force is |
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(1) 18 units (2) 11 units (3) 15 units (4) 10 units |
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| 31. | A cricket player catches a ball of mass 0.1 kg, moving with a speed of 10 ms-1 in 0.1 second. Force erected by him (N) |
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(1) 10
(2) 4 (3) 2 (4) 1 |
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| 32. | A body projected vertically upwards with a velocity u returns to the starting point in 4 second. If g = 10 ms-2, the value of u is ( ms-1) |
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(1) 10 (2) 5 (3) 4 (4) 20 |
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| 33. | Acceleration due to gravity is 'g' on the surface of the earth. Then the value of the acceleration due to gravity at a height of 32 km above earth's surface is |
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(1) 0.9 g (2) 0.99 g (3) 0.8 g (4) 1.01 g |
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| 34. | S.I. units of surface tension is |
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(1) N/M (2) Ns/m (3) J/S (4) N/m2 |
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| 35. | If V0 be the orbital velocity of a satellite in a circular orbit close to the earth's surface and Ve is the escape velocity for the earth, relation between the two is |
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(1) ve = 2V0 (2) ve = Ö2V0 (3) ve = Ö3V0 (4) v0 = Ve |
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| 36. | Equation of a progressive wave is given by y = a sin p (40t-x ) where a and x are in metre and t in second. The velocity of the wave is ( m/s): |
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(1) 40 (2) 10 (3) 80 (4) 20 |
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| 37. | Velocity of sound in a gas is 360 ms-1 and the distance between a compression and nearest rare faction is 1 m. Then the frequency of sound is (CPS): |
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(1) 360 (2) 90 (3) 720 (4) 180 |
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| 38. | A tuning fork A produces 4 beats/second with another tuning fork B of frequency 320 CPS. On filling the fork A, 4 beats/ second are again heard. Then, the frequency of fork A before filling (CPS) |
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(1) 320 (2) 328 (3) 316 (4) 324 |
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| 39. | A source of sound and a listener are approaching each other with a speed of 40 ms-1. The apparent frequency of a note produced by the source is 400 CPS. Then its true frequency is (CPS). (Velocity of sound in air = 360 ms-1) |
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(1) 400
(2) 360 (3) 420 (4) 320 |
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| 40. | Intensity level of a sound of intensity 1 is 30 dB. Then the ratio 1/10 is where 10 is the threshold of hearing): |
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(1) 10,000 (2) 1,000 (3) 3 (4) 30 |
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| 41. | Quality of a musical note depends on: |
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(1) harmonics present (2) amplitude of the wave (3) velocity of sound in the medium (4) fundamental frequency. |
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| 42 | Fundamental frequency of an open pipe of length 0.5 m is equal to the frequency of the first overtone of a closed pipe of length 1e. The Value of le is (m) |
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(1) 1 (2) 1.5 (3) 0.75 (4) 2 |
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| 43. | When the length of the vibrating segment of a sonometer wire is increased 1%, the percentage change in its frequency is |
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(1) 2 (2) 100/101 (3) 99/100 (4) 1 |
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| 44. | Sound waves of wave length greater than that of audible sound are called. |
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(1) ultrasonic waves
(2) sonic waves (3) seismic waves (4) infrasonic waves |
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| 45. | When a thin metal plate is placed in the path of one of the interfering beams of light |
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(1) the fringes become brighter (2) the fringes disappear (3) the fringe width increases (4) the fringes become blurred |
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| 46.` | Interference fringes are obtained using two coherent sources whose intensities are in the ratio 4:1. Then the ratio of the intensities of the bright and dark bands is |
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(1) 25 : 9 (2) 4 :1 (3) 5 : 1 (4) 9 :1 |
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| 47. | Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by ( a is the width of the slit) |
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(1) a sin q
=
3l/2 (2) a sin q = l/2 (3) a cos q = 3l/2 (4) a sin q = l |
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| 48. | q is the optical rotation produced by sugar solution of concentration C and taken in a glass tube of length 0.2 m and radius r. Then the solution is transferred to another glass tube of length 0.3 m and radius r and the remaining space is filled with distilled water. The optical rotation produced by this solution is |
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(1) 3 q (2) 2 q (3) q (4) 1.5q |
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| 49. | Biaxial crystal among the following is |
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(1) mica (2) tourmaline (3) calcite (4) quartz |
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| 50. | Electric charges + 10 µC, + 5µC, - 3µC and + 8µC are placed at the corners of a square of side Ö2 m. The potential at the centre of the square (V): |
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(1) 18 x 105 (2) 1.8 x 106 (3) 1.8 (4) 1.8 x 105 |
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| 51. | When 1019 electrons are removed from a neutral metal plate, the electric charge on it is (coulomb) |
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(1) 10+19 (2) + 1.6 (3) -1.6 (4) 10-19 |
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| 52. | Two metal spheres of radii R1 and R2 are charged to the same potential. The ratio of the charge on the two spheres is: |
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(1) R1/R2 (2) 1 (3) 1/2 (4) R1-R2 |
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| 53. | When a P.D. of 103 V is applied between A and B, a charge of 0.75 mC is stored in the system of capacitors. The value of C is (µF) |
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(1) 3 (2) 2.5 (3) 2 (4) 1/2 |
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| 54. | The equivalent capacitance of three capacitors of capacitance C1C2 and C3 connected in parallel is 12 units and the product of C1C2 C3 = 48. When the capacitors C1 and C2 are connected in parallel the equivalent capacitors is 6 units. Then the capacitances are: |
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(1) 1,5,6
(2) 1.5, 2.5, 8 (3) 2, 3, 7 (4) 2, 4, 6 |
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| 55. | A parallel plate air capacitor is charged to a P. D. V. After disconnecting the battery the distance between the plates of the capacitor is increased using an insulating handle. As a result P.D between the plates: |
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(1) decreases
(2) does not change (3) becomes zero (4) increases |
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| 56. | Resistance of a coil is 4.2 Ω at 1000C and the temperature coefficient of resistance of its material is 0.004/0C. Then its resistance at 00C is (Ω): |
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(1) 3.5 (2) 5 (3) 3 (4) 4` |
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| 57. | P. D between the points P and Q is the electric circuit shown is (V) |
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(1) 4.5 (2) 12 (3) 24 (4) 8 |
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| 58. | Three similar cells, each of emf 2V and internal resistance r Ω send the same current through an external resistance of 2 Ω, when connected in series or in parallel. The strength of the current flowing through the external resistance is (A) |
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(1) 0.75 (2) 1 (3) 1.5 (4) 2 |
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| 59. | A potentiometer wire of length 1 m and resistance 10 Ω is connected in series with a cell of emf 2V and internal resistance 1 Ω and a resistance box including resistance R. If the P.D. between the ends of the wire is 1 mV, the value of R is (Ω) |
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(1) 10000 (2) 19989 (3) 9989 (4) 20000 |
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| 60. | A wire of resistance R is uniformly stretched until its radius is halved. Its new resistance is |
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(1) 2R
(2) 4R (3) 8R (4) 16R |
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