(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
Which among the following gases is most toxic?
(A) Sulphur dioxide
(B) Carbon monoxide
(C) Carbon dioxide
(D) Chlorine
Catalyst is a substance which?
(A) Has no action of the rate of reaction
(B) Decreases the rate of reaction
(C) Increases the rate of reaction
(D) None of the above
Substance most commonly used as a food preservative is?
(A) Acetic acid
(B) Tartaric acid
(C) Sodium carbonate
(D) Sodium salt of benzoic acid