Page 1 :
(a) increase in temperature (b)increase in cross-sectional area, , (c) decrease in length (d)decrease in cross-sectional area, , In a current carrying conductor the net charge is, , (a) 1.6X10°C (b) 6.25X10"'8C (c)zero (d)infinite, Nichrome or Manganin is widely used in wire bound resistors because of their, (a)temperature independent resistivity, , (b)very weak temperature dependent resistivity, , (c)strong dependence of resistivity with temperature, , (d)mechanical strength, , A current pass through a wire of nonuniform cross section. Which of the following quantities, are independent of cross section, , (a) the charge crossing (b)Drift velocity, , (c)current density (d)free electron density, , In below circuit if the value of each resistance is 10 Q then equivalent resistance between a, , and b is, , , , (al0Q (b)20 Q (c)30Q (a)40.Q, , The resistance of silver wire at 0° is 1.25 Q. Up to what temperature it must be heated so that, its resistance is doubled? (givena for silver=0.0041°C"'), , (a)350°C (b)200°C (244°C (4)300°C, , A cell having emf of 1.5V, when connected across a resistance of 14 Q, produces a voltage of, only 1.4V across the resistance. The internal resistance of the cell must be, , (a)lQ (b)14Q (c)15Q (d)21Q, , Two conducting wires X and Y of same diameter but different materials are joined in series, across a battery. If the number density of electron in X is twice that in Y, find the ratio of drift, velocity of electrons in two wires is, , (a)1:2 (b)1:1 (c)2:1 (d)3:2, , For question | to 10 two statements are given —one labelled Assertion(A) and the other labelled, Reason (R).Select the correct answer to these question from the codes (a),(b),(c)and (d) as given, below., , (a) Both A and R are true and R is the correct explanation of A