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GCET MOCK TEST IN PHYSICS 2016 1. Which of the following has the longest de-Broglie wavelength if they are moving with the same velocity? a) Alpha particle b) Beta particle c) Neutron d) Proton 2. When a point source of light is at a distance of 50 cm from a photoelectric cell, the stopping voltage is found to be Vo. if the same source is placed at a distance of 1m from the cell, the stopping potential will be: a) Vo /-2 b) Vo /4 c) 2Vo d) Vo 3. A nucleus at rest splits into two nuclear parts having same density and radii in the ratio 1:2. Their ratio in velocities are: a) 6:1 b) 8:1 c) 2:1 d) 4:1 4. In Rutherfordโs alpha scattering experiment, what will the correct angle of scattering for impact parameter b=0? a) 270° b) 90° c) 180° d) 0° 5. The wavelength of the matter waves is independent of a) Velocity b) Mass c) Charge d) Momentum 6. The potential energy of the orbital electron in the ground state of hydrogen atom is โE. what is its kinetic energy? a) E/2 b) E/4 c) 4E d) 2E 7. Boolean expression for OR gate is a) Y=A+B b) Y=๐ดฬ c) Y=A-B d) Y=๐ดฬ + ๐ตฬ 8. When radio wave pass through ionosphere, phase difference between space current and capacitive displacement current is a) ฯ/2 rad b) ฯ rad c) 0 rad d) 3ฯ/2 rad 9. Which of the following device is full duplex? a) Loud speaker b) Radio c) Mobile phone d) Walky talky 10. N type semiconductor is obtained on doping intrinsic germanium by a) Aluminium b) Phosphorous c) Gold d) Boron 11. A hole in a semiconductor is ______________ in a covalent bond. a) A missing electron b) An excess electron c) A donor level d) A missing atom 12. N-P-N transistors are preferred to P-N-P transistors because they have a) Low dissipation of energy AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 13. 14. 15. 16. 17. b) Low cost c) Electrons have high mobility than hole and hence mobility of energy d) Capable of handing large power A point charge causes an electric flux of -1.0 x 103 Nm2 C-1 to pass through a spherical Gaussian surface of 10 cm radius central on the charge. If the radius of the Gaussian surface were three times, how much flux would pass through the surface? a) -3.0 x 103 Nm2 C-1 b) -2.0 x 103 Nm2 C-1 c) 3.0 x 103 Nm2 C-1 d) -1.0 x 103 Nm2 C-1 A stationary charge produces: a) Only magnetic field b) Only electric field c) None d) Both To increase the charge on the plates of a capacitor means a) To increase the capacitance on the capacitor b) To increase the potential difference between the plates c) To decrease the potential difference between the plates d) To decrease the capacitance of the capacitor If the uniform surface charge density on the infinite plane sheet is ฯ, electric field near the surface will be a) ฯ/ิ0 b) 2ฯ/ิ0 c) ฯ/2ิ0 d) 3ฯ/ิ0 Work done in placing a charge of 8 x 1018 C on a capacitor of capacitance 800 µF is: a) 3.1 x 10-26 J b) 16 x 10-32 J c) 4 x 10-32 J d) 32 x 10-32 J 18. Two identical coils having same number of turns and carrying equal current have common centre and their planes are at right angles to each other. What is the ratio of magnitude of the resultant magnetic field due to one of the coils at the centre? a) 2:1 b) 1:1 c) โ2:1 d) 1:โ2 19. Current of 10 A and 2 A are passed through two parallel wires A & B respectively in opposite directions. If the wire A is infinitely long and length of wire B is 2m, the force acting on the conductor B which is situated at 10 cm distance from A will be: a) 8ฯ x 10-7 N b) 8 x 10-5 N c) 4ฯ x 10-7 N d) 5 x 10-5 N 20. A voltmeter has a resistance of G ohm and range of V volt. The resistance required in series to convert it into a voltmeter it into a voltmeter of range n V volt is a) G/n-1 b) G/n c) nG d) (n-1)G 21. If velocity of an electron is ( 2๐ฬ + 3๐ฬ) m/s and it enters in the magnetic field of 4kT, then a) Its speed will change b) Direction of its velocity will change AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 22. 23. 24. 25. 26. c) It will move in the opposite direction to the magnetic field d) It will move in the direction of the magnetic field An electron having 182 eV kinetic energy is moving on a circular path in a magnetic of 10-4 T. the speed of the electron is : a) 4 x 107 m/s b) 32 x 1014 m/s c) 8 x 107 m/s d) 16 x 107 m/s ฬ , is A bar magnet of magnet moment ๐ placed in a magnetic field of induction ๐ตฬ . ฬ .๐ตฬ a) - ๐ ฬ .๐ตฬ b) ๐ ฬ c) โ ๐ตฬ .๐ ฬ x๐ฉ ฬ d) ๐ To convert a galvanometer into a ammeter we connect a) Low resistance in parallel with it b) Low resistance in series with it c) High resistance in parallel with it d) High resistance in series with it The dimension of RC are same as the dimensions of which of the following? a) LR b) L/R c) RLC d) R/L What is the self inductance of a coil which produces, self induced emf of 5 V, when the current changes from 3 A to 2 A in one millisecond? a) 50 H b) 5000 H c) 5 mH d) 5 H 27. Domain formation is the necessary feature of a) Para magnetism b) Diamagnetism c) All of them d) Ferromagnetism 28. A coil of self inductance 0.5 mH carries a current of 2 A. the energy stored in jouleis: a) 0.5 b) 0.05 c) 1.0 d) 0.1 29. A LCR series A.C. circuit is turned to resonance. The impedance of the circuit is now: a) [R2 + (ฯL)2 + (1/ฯC)2] ½ b) [R2 + (ฯL โ 1/ฯC) 2] ½ c) R d) [R2 + (1/ฯC โ ฯL)2] ½ 30. Resonance frequency of LCR series ac circuit is f0. Now the capacitance is made 4 times, then the new resonance frequency will become: a) f 0 b) f 0/2 c) f 0/4 d) 2f0 31. If the earth did not have atmosphere, the temperature would be a) More b) Same c) None d) Less 32. Write dimensional formulae for the intensity of radiation a) M1L2T-2 b) M1L2T-3 c) M1L0T3 d) M1L0T-3 AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 33. A wavelength of monochromatic light in vacuum is ฮป. It travels from vacuum to medium of absolute refractive index µ. The ratio of wavelength of the incident and refracted wave is a) µ : 1 b) 1 : µ c) µ2 : 1 d) 1 : 1 34. An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. the image produced is a) Real and erect b) Virtual and inverted c) Real, inverted and smaller in size d) Real, inverted and same in size 35. The phenomenon of polarization of electromagnetic waves proves that the electromagnetic waves are a) Longitudinal b) Transverse c) Neither (a) nor (b) d) Mechanical 36. The limit of resolution of an optical instrument arises on account of a) Polarization b) Interference c) Reflection d) Diffraction 37. Two waves coming from two coherent sources having intensities interfere their ratio of maximum intensity to minimum intensity is 25. The intensities of the sources are in the ratio: a) 9 : 4 b) 5 : 1 c) 25 : 1 d) 25 : 16 38. The threshold wavelength for a metal having work function W0 is ฮป0. What is the threshold wavelength for a metal whose work function is W0/2? a) ฮป0 / 2 b) ฮป0 / 4 c) 4ฮป0 d) 2ฮป0 39. The photoelectric threshold wavelength for potassium having work function of 2 eV is a) 618.7 nm b) 1860 nm c) 310.7 nm d) 1240 nm 40. In Youngโs experiment, the distance between two slits is halved and the distance between the screen and slit is made three times. Then width of the fringe a) Remains the same b) Becomes half c) Becomes 4 times d) Becomes 6 times 41. The north pole of a magnet is falling on a metallic ring as shown the figure. The direction of induced current, if looked from upside in the ring will be a) No induced current b) Clock or anticlockwise depending on metal of ring c) Clockwise d) Anticlockwise 42. The ration of cross sectional areas of two conducting wires made up of same AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 material and having same length is 1 : 2. What will be the ratio of heat produced per second in the wires, when same current in flowing them? a) 2 : 1 b) 1 : 4 c) 1 : 1 43. 44. 45. 46. d) 1 : โ2 An AND gate is followed by a NOT gate in series. With two inputs A and B, the Boolean expression for the output Y will be a) ฬ ฬ ฬ ฬ ฬ ๐ด. ๐ต b) ฬ ฬ ฬ ฬ ฬ ฬ ฬ ฬ ๐ด+๐ต c) A + B d) A.B In an A.C circuit, a resistance of R ohm is connected in series with an inductor of self inductance L. if the phase angle between voltage and current be 45°, the value of inductive reactance (XL) will be equal to a) R/8 b) R c) R/2 d) R/4 Advantages of optical fibre communications over two wire transmission line or co axial cable transmission are a) High band width, high transmission loss b) low band width, low transmission loss c) low band width, high transmission loss d) High band width, low transmission loss There are 2.0 x 1024 molecular dipoles in a paramagnetic salt. Each has dipole 47. 48. 49. 50. 51. moment 1.5 x 10-23 Am2. Find maximum (saturation) magnetization in the specimen. a) 50 Am2 b) 200 Am2 c) 30 Am2 d) 20 Am2 At a given place on earth, the angle between the magnetic meridian and the geographic meridian is called __________ a) Magnetic declination b) Magnetic longitude c) Magnetic dip d) Magnetic latitude The audio frequency lies in the range of a) 12 Hz to 20 MHz b) 20kHz to 20 MHz c) 20 Hz to 20 kHz d) 20 Hz to 20 MHz The diameter of the lens of a telescope is 0.61 m. wavelength of light is 5000 ๐ดฬ. The resolution power of the telescope is a) 2 x 102 b) 2 x 104 c) 106 d) 2 x 106 The internal resistance of a cell of emf 4 V is 0.1 ฮฉ. It is connected to a resistance of 3.9 ฮฉ. The voltage across the cell will be a) 2 V b) 3.9 V c) 3.8 V d) 0.1 V A ray of light travelling in water is incident on a glass plate immersed in it. When the angle of incidence is 51°, the reflected ray is totally plane polarized, then find out the refractive index of AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 52. 53. 54. 55. 56. glass. (R.I of water=1.3 and tan 51°=1.235) a) 1.805 b) 1.33 c) 1.305 d) 1.605 Cross sectional area of a copper is equal to area of square of length 2 mm. if this copper wire draws 8 A electric current, then find the drift velocity of free electron. Number density of electron in copper wire is 8 x 1028 m-3. a) 3.12 x 10-2 ms-1 b) 3.12 x 10-3 ms-1 c) 1.56 x 10-2 ms-1 d) 1.56 x 10-4 ms-1 Which of the following undergoes largest diffraction. a) Radio wave b) IR light c) UV light d) Gamma rays A current flows in a conducting wire of length L. if we bend it in a circular form, its magnetic dipole moment would be a) IL/4ฯ b) IL2/4ฯ c) I2L2/4ฯ d) I2L/4ฯ The tower has height of 75 m. what is the maximum distance up to which UV transmission can be received? (radius of earth=6400 km) a) 38.98 km b) 30.98 km c) 50.98 km d) 40.98 km Equivalent capacitance between X & Y a) 4 µF b) 2 µF c) 1 µF d) 3 µF 57. Complete the nuclear reaction: 4Be9 + 4 12 2He โ 6C + ______ a) Neutrino b) Neutron c) Electron d) Proton 58. The number of photons of wavelength 600 nm emitted per second by an electric bulb of 60 W is a) 1.5 x 1020 b) 3.0 x 1020 c) 2.0 x 1020 d) 2.0 x 10-20 59. Which of the following graphs represents motion with uniform speed? 60. When the electric current is switched off, why do the blades of a fan keep on moving for some time? a) Force b) Torque c) Air AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 61. 62. 63. 64. 65. 66. d) Inertia When torque acting on a system is zero, which of the following will be constant? a) Force b) Linear momentum c) Angular momentum d) Linear impulse Two satellites are moving in the same circular orbit around the earth. They must have the same a) Mass b) Kinetic energy c) Angular momentum d) Speed The collector current of a NPN transistor is 3.9 mA, its emitter current is 4 mA. What is the common base current gain of the transistor? a) 0.975 b) 0.675 c) 0.865 d) 0.873 Unit of dielectric constant of a medium is a) C/Nm b) Nm2/C2 c) C2/(Nm)2 d) None of the above A transformer works on the principle of a) Converter b) Inverter c) Mutual induction d) Self induction An electromagnetic wave goes from air to glass. Which of the following does not change? a) Wavelength b) Speed c) Frequency d) Amplitude 67. In a capacitive circuit a) Current leads voltage by phase of ฯ/2 b) Voltage leads current by phase of ฯ/2 c) Current and voltage are in same phase d) Sometimes current lead and sometimes voltage 68. The self inductance of a straight conductor is a) Zero b) Very large c) Infinite d) Very small 69. Which of the following statements are correct? I] the direction of the current produced by electromagnetic induction is given by Lenzโs law II] A permanent magnet is used in a small dynamo III] The current produced by a A.C. generator changes in direction only IV] Generators work on the principle of electromagnetic induction. a) I, II & III b) II & III c) III & IV d) II & IV 70. The amplitude of electric and magnetic fields relate to each other is a) E0 = B0 b) E0 = cB0 c) E0 = B0/c d) E0 = c/B0 71. The electric field inside a spherical shell of uniform surface charge density is a) Zero b) Less than zero AABHA MAYUR #8600997950 GCET MOCK TEST IN PHYSICS 2016 c) Directly proportional to distance from the centre d) None of these 72. Ratio of intensities of two waves is given by 9 : 1. Then the ratio of their amplitude is a) 1 : 9 b) 9 : 1 c) 2 : 1 d) 3 : 1 73. What will be the angular momentum in the fourth orbit, if L is the angular momentum of the electron in the second orbit of hydrogen atom? a) 3 2 d) 2 3 L 74. A cylindrical lens is required to correct a) Astigmatism b) Presbyopia c) Myopia d) Hypermetropia 75. What changes on polatization of light? a) Wavelength b) Phase c) Frequency d) Intensity L b) 2๐ฟ c) L/2 AABHA MAYUR #8600997950