Whole XII Physics Mdcat Online Test-1 2024

1. The area enclosed within a PV curve is:

2. In an isochoric process:

3. For a set of oppositely charged, Infinite parallel plates, what is true about the electric field Inside  and outside the plates:

4. Charge 2Q and –Q are placed as shown in the figure. The point where electric intensity is zero lies:

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5. The slope of the graph shown in figure below is:

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6. When two objects come to common temperature, the body is said to be in:

7. The force between two charges is 120 N, if the distance between the charges is doubled, the force will be:

8. The lines of force due to charged particles are:

9. Electric field lines and an equipotential surfaces are:

10. Electron and proton enter in the same magnetic field, which particle will experience larger deflection if they enter at an angle of 90°?

11. A 1m long wire carrying a current of 2 A is held at an angle of 30o with the direction of a uniform magnetic field of strength 2T, force acting on the wire is:

12. What happens in series combination of two or more than two resistances?

13. The electric resistance of a certain wire of iron is ‘R’, if its length and radius are both doubled, then.

14. A steady current is flowing through a conductor of uniform cross-section, then we can
say that net charge on conductor is:

15. The self inductance of a coil is a measure of its:

16. Photo current depends upon:

17. In one radioactive decay, Radium (Ra) gives rise to Radon (Rn) as shown :

What particle is also produced?

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18. A 1000-turn coil having a length of 20 mm and a width of 10 mm is pivoted in a magnetic field having a flux density of 1 T, If the coil carries a current of 10 A, then the torque acting on the coil will be:

19. Inside solenoid:

20. A 10V battery and two resistors having 400-ohm and 600-ohm resistance are connected as a voltage divider. What is the voltage across the 600ohm resistor?

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21. Inside the magnet, field lines travel from?

22. Magnetic flux density at any point is 1 tesla, if:

23. A uniform magnetic field will cause a charge to move in a helical path, if the charge Is moving:

24. When different resistors are connected across the terminal of a battery:

25. Lenz's law is a form of the:

26.

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27. Which of the following is the percentage of the original quantity of a radioactive
material left after five half-lives approximately

28. A conducting wire of resistivity “ p “ is cut into two equal parts. The resistivity of each part Will be:

29. The Eddy current loss in a transformer can be reduced by:

30. A battery with an electromotive force (EMF) “E” and an internal resistance “r” is supplying a current. What is the terminal potential difference “V” across the battery?

31.

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32. When one electron is taken towards the other electron, then the electric potential energy Of the system

33. If the half-life of a radioactive atom is 6.93 days, then its decay constant would be:

34. A Capacitor which has a capacitance of 1 farad will

35. As in figure shown, if a capacitor C is charged by connecting it with resistance R, then
energy is given by the battery will be:

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36. How many electrons per second constitute a current of one micro ampere?

37. Weber ampere per metre is equal to:

38. Gauss is the unit of:

39. In a closed ring (A) and in an open ring (B) magnets are falling along the axis of the
ring. The current generated in a and b have directions:

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40. A metallic circular ring is suspended by a string and is kept in a vertical plane. When a magnet is approached towards the ring then it will

41. For black body, the energy of emitted thermal radiation depends on:

42. Rayleigh-jeans formula was excellent for":

43. What is the minimum energy required for a photon to undergo pair production?

44. According to classical theory of light, there should be no:

45. What is the energy of an X-ray photon With a wavelength of 13.26 Å In joules?

46. During negative beta decay:

47. The diagram shows the paths of three different types of radiation X, Y and Z.

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48. Lyman series of H-atoms lie in the__ region of.

49. The ionization energy of H-atom is

50. Which of the following radioisotopes is Commonly used for dating Archaeological artifacts?

51. During an adiabatic process:

52. A transformer is used at:

53. Two wires, when connected in series, have an equivalent resistance of 18Ω, and when connected in parallel, an equivalent resistance of 4Ω. Find their resistance:

54. A transformer has 1000 turns in the primary and is supplied 120V DC. What voltage is available at 24000 turns secondary coil?

55. A transformer can be a step-up transformer when the number of coils in the secondary coil is:

56. In a hydrogen atom, an electron jumps from n = 4 to n = 2 orbit, the wavelength of emitted radiation:

57. The radioactive disintegration is:

58. The uses of radiations are:

59. A metal sheet with a circular hole is heated, The hole:

60. If heat is supplied to an ideal gas in an isothermal process:

61. Which of the following particles will describe the smallest radius when projected with the same velocity perpendicular to a magnetic field?

62. An electron is moving with a speed of 0.99c. Its relativistic mass will be:

63. In pair production:

64. According to the principle of relativity:

65. Which of the following is the result of the photoelectric effect experiment?

66. The characteristic X-rays spectrum is:

67. When an electron jumps from higher energy states to the first orbit, then the spectral series obtained is called:

68. Two metallic plates are connected across a 12-volt battery when they are 1 m apart. If the two plates are separated by a distance of 2m from each other, the voltage will be:

69. External and internal resistance in any cell producing EMF are always in:

70. Joule per coulomb is the unit of:

71. If voltage is increased by a factor of 2, then Capacitance will be:

72. Unit of Magnetic Flux Density is similar to:

73. The slope of Kinetic energy and cutoff frequency gives:

74. How many electrons pass through an electric bulb in one minute if 300mA current is passing through it?

75. The ratio between the 3rd and 6th orbit radius of a hydrogen atom is:

76. Paschen series lies in:

77. If two charges are separated by a certain distance, the force between them is directly proportional to:

78. Coulomb’s law is applicable for:

79. The electric potential at a point in an electric field is defined as

80. Which of the following correctly describes the direction of the electric field?

81. In a charged conductor, the electric field inside the conductor is:

82. The dielectric constant of a material is:

83. Which of the following factors does not affect the capacitance of a capacitor?

84. In a series circuit, the total resistance is:

85. The SI unit of electromotive force (EMF) is

86. In a parallel circuit, the total capacitance is:

87. Two identical metal spheres are placed very close to each other, but not touching. If one sphere is positively charged and the other is uncharged, what happens when the two spheres are allowed to touch each other?

88. If a point charge is placed at the center of a spherical Gaussian surface, the electric flux through the surface depends on:

89. The potential energy of a system of two charges is defined as zero when:

90. If the resistance of a wire is R, what will happen to the current if the potential difference across the wire is doubled?

91. A charged particle is moving in a uniform magnetic field. Which of the following statements is true about the force on the particle:

92. The magnetic field inside a long, straight solenoid carrying current is:

93. Two parallel wires carry current in opposite directions. The magnetic force between them will:

94. Which of the following best explains Lenz's law?

95. When the magnetic flux through a coil changes, an EMF is induced in the coil. Which of the following does not affect the magnitude of the induced EMF?

96. A long solenoid of length (L) and number of turns (N) carries a current (I). The magnetic field inside the solenoid is (B). If the length of the solenoid is halved, keeping the number of turns per unit length and current constant, what will be the new magnetic field inside the solenoid?

97. The capacitance of parallel plate capacitors can be increased by

98. Kinetic energy of photoelectrons depends on

99. unit of self-inductance is

100. Whenever a wave enters from one medium to the another, its