Current Electricity MCQ Quiz - Multiple Choice Questions & Answers Page 4

31. The resistivity of alloy manganin is

1. Nearly independent of temperature
2. Increases rapidly with increase in temperature
3. Decreases with increase in temperature
4. Increases rapidly with decrease in temperature

32. The smallest resistance that can be obtained by the combination of n resistors each resistance r is :

1. r/n
2. nr
3. nr
4. n²r

33. The specific resistance of a rod of copper as compared to that of thin wire of copper is :

1. less
2. more
3. same
4. depends upon the length and area of cross-section of the wire

34. 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 :

1. 2 : 3
2. 4 : 9
3. 1 : 1
4. 3 : 2

35. Two equal resistors are connected in series across a battery and consume a power of P. If these are connected in parallel, then the power consumed will be:

1. 2P
2. 4P
3. p4
4. P

36. Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be

1. Twice of the second
2. Half of the second
3. Equal to the second
4. Four times of the second

37. When a metal conductor connected to left gap of a meter bridge is heated, the balancing point

1. shifts towards right
2. shifts towards left
3. remains unchanged
4. remains at zero

38. Which of the following has a negative temperature coefficient of resistance ?

1. Tungsten
2. Carbon
3. Nichrome
4. Platinum