2nd PUC Physics Series-10

91. he temperature coefficient of resistance is expressed in :

92. Copper wire is used as connecting wire because :

93. The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :

94. The phenomenon of super-conductivity was discovered by :

95. The specific resistance of a conductor increases with :

96. In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :

Q.97 Two conductors of equal length and radii the ratio of 2 : 3 are; connected in parallel the source of electricity. The ratio of the velocity of electrons in the conductor be :

98. The charge flowing in a conductor varies with time as :
q = αt 12 βt² + 16 γt³
Where α, β, γ are positive constants. Then the initial current (l) is given by the condition :

99. In questions 38, the maximum value of current (l_max) is given by the condition :

100 In questions 38, the line (t) after which the value of current reaches a maximum values given by :