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MCQs 1: On which of the following factors does the resistivity of a material depend ?

Resistance of the conductor Area of the conductor section Length of the conductor All of the above
Answer Explanation

MCQs 2: Mercury as an electric contact material is_______________?

a liquid a metal a metal liquid a gas
Answer Explanation

MCQs 3: Which of the following resistive materials has the lowest temperature co-efficient of resistance ?

Nichrome Constantan Kanthal Molybdenum
Answer Explanation

MCQs 4: The conductors have transport phenomena of electrons due to____________?

electric field magnetic field electromagnetic field none of the above
Answer Explanation

MCQs 5: An H.R.C. fuse is_______________?

a ceramic body having metal and caps a wire of platinum a heavy cross-section of copper or aluminium a ceramic tube having carbon rod inside it
Answer Explanation

MCQs 6: The coils of D.C. motor starter are wound with wire of_______________?

copper kanthal manganin nichrome
Answer Explanation

MCQs 7: By increasing impurity content in the metal alloy the residual resistivity always_____________?

decreases increases remains constant becomes temperature independent
Answer Explanation

MCQs 8: At transition temperature the value of critical field is____________?

zero negative real value positive real value complex value
Answer Explanation

MCQs 9: The transition temperature of mercury is____________?

18.0°K 9.22°K 4.12°K 1.14’K
Answer Explanation

MCQs 10: The structure sensitive property of a super conductor is______________?

critical magnetic field transition temperature critical current density none of the above
Answer Explanation

MCQs 11: Constantan contains_______________?

silver and tin copper and tungsten tungsten and silver copper and nickel
Answer Explanation

MCQs 12: Which of the following is the poorest conductor of electricity ?

Carbon Steel Silver Aluminium
Answer Explanation

MCQs 13: Which of the following variety of copper has the best conductivity ?

Induction hardened copper Hard drawn copper Pure annealed copper Copper containing traces of silicon
Answer Explanation

MCQs 14: Overhead telephone wires are made of_____________?

aluminium steel ACSR conductors copper
Answer Explanation

MCQs 15: __________ is the main constituent of glass?

Fe203 Si02 AI2O3 B2O3
Answer Explanation

MCQs 16: ___________ is most commonly used for making magnetic recording tape?

Silver nitrate Ferric oxide Small particles of iron Silicon-iron
Answer Explanation

MCQs 17: Carbon electrodes are not used in_______________?

GLS lamps electric arc furnace dry cells cinema projectors
Answer Explanation

MCQs 18: In thermocouples which of the following pairs is commonly used ?

Copper-constantan Aluminium-tin Silver-German silver Iron-steel
Answer Explanation

MCQs 19: Solder is an alloy of______________?

copper and aluminium tin and lead nickel, copper and zinc silver, copper and lead
Answer Explanation

MCQs 20: _____________is viscoelastic?

Cast-iron Graphite Rubber Glass
Answer Explanation

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