Practice Test: Question Set - 03
1. Superconductivity is observed for
- (A) Infrared frequencies
- (B) D.C. and low frequency
- (C) A.C. and high frequency
- (D) Frequencies having no effect
2. The structure sensitive property of a super conductor is
- (A) Critical magnetic field
- (B) Transition temperature
- (C) Critical current density
- (D) None of the above
3. _______ is viscoelastic.
- (A) Cast iron
- (B) Graphite
- (C) Rubber
- (D) Glass
4. Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron.
- (A) Increases
- (B) Decreases
- (C) Does not change
- (D) None of the above
5. Which of the following materials is preferred for transmitting electrical energy over long distance?
- (A) Copper
- (B) Aluminium
- (C) Steel reinforced copper
- (D) Steel reinforced aluminium
6. In a crystal, an atom vibrates at a frequency determined by
- (A) The heat content of the crystal
- (B) The temperature of the crystal
- (C) The stiffness of the bonds it makes with
neighbours
- (D) None of the above
7. Steel wire is used as
- (A) Overhead telephone wire
- (B) Earth wire
- (C) Core wire of ACSR
- (D) All of the above
8. Due to which of the following fact, in India, aluminium is replacing copper?
- (A) Aluminium is more ductile and malleable than
copper
- (B) Aluminium is available in plenty, cheaper
and lighter than copper
- (C) Aluminium has lower resistivity than that of
copper
- (D) Aluminium has less temperature coefficient than
copper
9. The carbon percentage is least in
- (A) Low carbon steel
- (B) Wrought iron
- (C) Cast iron
- (D) Malleable iron
10. ________ is a negatively charged particle present in an atom.
- (A) Proton
- (B) Neutron
- (C) Electron
- (D) None of the above
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