Practice Test: Question Set - 09
1. Mercury as an electric contact material is
- (A) A liquid
- (B) A metal
- (C) A metal liquid
- (D) A gas
2. Constantan contains
- (A) Silver and tin
- (B) Copper and tungsten
- (C) Tungsten and silver
- (D) Copper and nickel
3. Carbon rods are used in wet and dry cells because
- (A) Carbon rod serves as conductor
- (B) Carbon can resist the attack of battery acid
- (C) Both (A) and (B)
- (D) Either (A) or (B)
4. The covalent bond is formed by
- (A) Transfer of electrons between atoms
- (B) Sharing of electrons between atoms
- (C) Sharing of variable number of electrons by a
variable number of atoms
- (D) None of the above
5. A perfect conductor has
- (A) Zero conductivity
- (B) Unity conductivity
- (C) Infinite conductivity
- (D) None of the above
6. In a superconductor the value of critical density depends upon
- (A) Magnetic field strength
- (B) Temperature
- (C) Either (A) or (B)
- (D) Both (A) and (B)
7. Carbon bearings are used under which of the following conditions?
- (A) Where lubrication is difficult or impossible
- (B) Where corrosive chemical action exists
- (C) Where high temperature exists
- (D) All of the above
8. An H.R.C. fuse is
- (A) A ceramic body having metal and caps
- (B) A wire of platinum
- (C) A heavy cross-section of copper or aluminium
- (D) A ceramic tube having carbon rod inside it
9. Which of the following variety of copper has the best conductivity?
- (A) Induction hardened copper
- (B) Hard drawn copper
- (C) Pure annealed copper
- (D) Copper containing traces of silicon
10. ________ is an example of piezoelectric material.
- (A) Glass
- (B) Quartz
- (C) Corundum
- (D) Neoprene
0 blogger:
Post a Comment