1031. Which of the following is not a conducting material ?

A. Copper
B. Tungsten
C. Germanium *
D. Platinum

1032. The fuse material used in electrical lines must have which one of the following properties ?

A. High resistivity
B. Low conductivity
C. High melting point
D. Low melting point *

1033. Manganin an alloy of copper an manganese is used to :

A. Soldering material
B. Heating elements
C. Ballast resistors
D. Standard resistances *

1034. Which one of the following materials is used for making permanent magnets ?

A. Steel
B. Carbon
C. Carbon steel *
D. Graphite

1035. Effective Q of the equivalent electrical circuit of quartz crystal is of the order of :

A. 200
B. 2,000
C. 20,000 *
D. 2,00,000

1036. What type of magnetic behavior is observed in a type I superconductor ?

A. Perfect diamagnetism *
B. Perfect paramagnetism
C. Perfect ferromagnetism
D. Perfect ferrimagnetism

1037. Purely mechanical instruments cannot be used for dynamic measurements because they have :

A. High inertia *
B. Large time constant
C. High response time
D. All of the above

1038. The full-scale reading (deflection) accuracy of a 0.250 v voltmeter is guaranteed to be one percent. The voltage measured by this instrument is 100 v, and the limiting error is given by:

A. 1.25 %
B. 25 %
C. 0.25 %
D. 2.5 % *

1039. The absolute measurement of resistance involves th measurement of :

A. Length and time
B. Length and mass
C. Velocity
D. Acceleration
E. Either A or C *

1040. The’ voltage stability with time of reference diodes incorporating zener diodes is comparable to that of which of the following ?

A. Dry cells
B. Nickel-cadmium cells *
C. Lead-acid accumulator batteries
D. Conventional standards cells