73. Select and write the correct option from the options given in each question : Which is used as a voltage regulator? (i) |

74. Fill in the blanks : (i) The maximum frequency wave in electromagnetic waves is _____. (ii) The behavior of Solenoid like |

75. Match the column "A" with column "B" : (i) Magnifying power of Compound Microscope (a) (1-D/f) |

76. Write the answers in one sentence each : (i) How does focal length of lens depends the power of lens ? (ii) Which gate is known |

77. Write any two limitations of Ohm's law. |

78. Write Kirchoff's Voltage law. |

79. What is Lorentz force ? |

80. Define one Ampere. |

81. The polarising angle of a transparent medium is 30º. Calculate the angle of refraction. |

82. The diameter of objective lens of a Telescope is 1 meter. Calculate its resolving power for the light of wavelength 4538 Å. |

83. Write Faraday's second law of electromagnetic induction. |

84. Differentiate between Self Induction and Mutual Induction. (any two) |

85. Show that the electric flux passing through a surface parallel to the electric field is zero. |

86. Describe the electric field and electric potential inside the charged conductor. |

87. The danger signal is always red, why ? |

88. On what factors, does the refractive index of a medium depend ? (any two) |

89. What is stopping potential ? |

90. Write any two characteristics of matter waves. |

91. Draw the truth table of NAND gate and explain it. |

92. Write the differences between N-type and P-type semiconductors. (any two) |

93. In an electrical circuit, resistances R1 and R2 are combined in parallel, then prove that the equivalent resistance is Req = (R1 R2)/(R1+R2) |

94. Establish the relation among electromotive force, potential difference and internal resistance of a cell. |

95. Draw the labelled diagram of a meter bridge. On which principle it works? Write any two precautions. |

96. Describe the principle of Potentiometer with electrical circuit. |

97. Write differences between Simple Microscope and Astronomical Telescope. (any three) |

98. Combine two thin convex lens be mutual contact, then prove that the focal length of combine lens F= (f1f2)/(f1+f2) |

99. A step-down transformer changes the transmitted line voltage from 11000 Volt to 440 Volt. The number of turns in the primary |

100. Calculate the energy stored in a coil of inductance 100 Henry due to flow of current 4 Ampere in it. |

101. What is meant by logic gates? Write Symbol, Boolean formula and Truth table for OR, AND and NOR gates. |

102. What is P-N junction diode ? How does diode used as a forward bias ? Explain. |

103. What is a capacitor ? Establish an expression for finding capacitance of the parallel plate capacitor. |

104. What is an electric dipole ? Establish an expression for finding electric field intensity of an electric dipole for equatorial position. |

105. What is an A.C. generator? Draw a labelled diagram and describe the working of A.C. dynamo. |

106. Describe the following points in an L-C-R circuit : (1) Electrical circuit (2) Phasor diagram (3) Resultant voltage |