Multiple Choice Question/ Objective question Electrical Material Part -3 for Competition Exam
Q.1. Hard magnetic materials are used for making
(a) Permanent magnets
(b) Temporary magnets
(c) Conductors
(d) Insulator
Ans (a)
Q.2. Tick off the material, which is different from the group
Ans (a)
Q.2. Tick off the material, which is different from the group
(a) Constantan
(b) Manganin
(c) Nichrome.
(d) Brass
Ans (d)
Q.3. Tick of the property, which is different from the group
Q.4. The converse of hardness is known as
Ans (d)
Q.3. Tick of the property, which is different from the group
(a) Ductility
(b) Resistivity
(c) Tensile strength
(d) Hardness
Ans (b)
Ans (b)
Q.4. The converse of hardness is known as
(a) Malleability
(b) Toughness
(c) Softness
(d) None of the above
Ans (c)
Q.5. On which of the following factors does the resistivity of a material depend
Ans (c)
Q.5. On which of the following factors does the resistivity of a material depend
(a) Resistance of the conductor
(b) Area of the conductor section
(c) Length of the conductor section
(d) All of the above
Ans (d)
Q.6. A perfect conductor has
Q.7. The metal having the lowest temperature coefficient of resistance is
Ans (d)
Q.6. A perfect conductor has
(a) Zero conductivity
(b) Unity conductivity
(c) Infinite conductivity
(d) None of the above
Ans (c)
Ans (c)
Q.7. The metal having the lowest temperature coefficient of resistance is
(a) Gold
(b) Copper
(c) Aluminium
(d) Nickel
Ans (a)
Q.8. Commonly used conducting materials are
Q.9. which of the following materials is preferred for transmitting electrical energy over long distance ?Q.8. Commonly used conducting materials are
(a) Gold
(b) Copper
(c) both (a) and (b) you
(d) Copper and Silver
Ans (c)
(a) Gold
(b) Copper
(c) Steel reinforced copper
(d) Steel reinforced aluminium
Ans (d)
Q.10. A highly conductive material must have
Q.10. A highly conductive material must have
(a) lowest temperature co-efficient
(b) Good mechanical strength
(c) Good corrosion resistance
(d) All of the above
Ans (d)
Q.11. The conductivity of a conductor can be increased by
Ans (d)
Q.11. The conductivity of a conductor can be increased by
(a) Decreasing its temperature
(b) Increasing its temperature
(c) Decreasing its vibration
(d) Increasing its vibration
(d) Increasing its vibration
Ans (a)
Q.12. Super conductivity is observed for
Q.12. Super conductivity is observed for
(a) Infrared frequencies
(b) d.c. and low frequency
(c) a.c. and high frequency
(d) frequencies having no effect
Ans (b)
Q.13. The superconductivity is due to
Q.13. The superconductivity is due to
(a) The crystal structure having no atomic vibration at 0°K
(b) All electrons interact in the super-conducting state
(c) The electrons jump into nucleus at 0°K
(d) None of the above
Ans (a)
Q.14. The value of critical field below the transition temperature will
Q.14. The value of critical field below the transition temperature will
(a) Increase
(b) Decrease
(c) Remain unchanged
(d) None of the above
Ans (a)
Q.15. In a superconductor the value of critical density depends upon
Ans (a)
Q.15. 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)
Ans (d)
Ans (d)
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