(A) Decreases
(B) Increases
(C) Remains constant
(D) Changes exponentially
Tag: Physics Mcq Questions and Answers
A substance having the negative temperature co-efficient of resistivity out of the following is?
(A) Tungsten
(B) Carbon
(C) Gold
(D) Iron
Specific resistance of a material depends upon?
(A) Temperature
(B) Length
(C) Area
(D) None of the above
The SI unit of resistivity is?
(A) Ohm-m-1
(B) Ohm-m0
(C) Ohm-m1
(D) Ohm-m2
Temperature co-efficient of resistivity is measured in?
(A) K
(B) K-1
(C) Ωm
(D) Ωk
A wire of uniform area of cross section A and length L is cut into two equal parts. The resistivity of each part is?
(A) Half
(B) Doubled
(C) Remains the same
(D) Increases three times
A battery of 50 volts is attached to a series combination 0f 5Ω, 0Ω and 10Ω. The current in the circuit is?
(A) 2 Amp
(B) 3.34 Amp
(C) 10 Amp
(D) 20 Amp
Material having positive temperature coefficient is?
(A) Germanium
(B) Silicon
(C) Copper
(D) Carbon