Multiple Choice Question/ Objective question Electrical Material Part -2 for Competition Exam

Q.1. Materials, which provide a path to the magnetic flux, are classified as

      (a)  Insulating materials

      (b)  Semi conducting materials

      (c)  Magnetic materials

      (d)  dielectric materials
Ans (c)

Q.2. Ferrites are

      (a)  Ferromagnetic material

      (b)  Ferrimagnetic materials

      (c)  Anti ferromagnetic material

      (d)  Diamagnetic materials
Ans (a)

Q.3. The relative permeability of a para magnetic substance is

      (a)  Unity

      (b)  Slightly more than unity

      (c)  Zero

      (d)  100
Ans (b)

Q.4. Manganin is an alloy of

      (a)  Copper, Manganese and Nickel

      (b)  Copper and Manganese

      (c)  Manganese and Nickel

      (d)  Copper and Manganese
Ans (b)

Q.5. Eddy current loss is proportional to the

      (a)   frequency

      (b)  Square of the frequency

      (c)  Cube of the frequency

      (d)  Square-root of the frequency
Ans (b)

Q.6. Copper is completely miscible with

      (a)   Nickel

      (b)   Gold

      (c)   Hydrogen

      (d)  lead
Ans (b)

Q.7. Resistivity of conductors is most affected by

      (a)   Composition

      (b)   Temperature

      (c)    Pressure

      (d)   Current
Ans (b)

Q.8. Copper constantan is used for measuring temperature up to

      (a)  1400 C

      (b)  1100 C

      (c)   800 C

      (d)  400 C
Ans (d)

Q.9. The conductivity of copper is less than that of silver by

      (a)    5 – 10 %. 

      (b)   50 – 60 %.

      (c)    20 – 30 %

      (d)   80 – 90 %.
Ans (a)

Q.10. For silicon the forbidden gap is

      (a)  1.1eV

      (b)  0.25eV

      (c)   0.5eV

      (d)  0.7eV
Ans (a)

Q.11. The most malleable, ductile low resistivity material is

      (a)  Copper

      (b)  Aluminium

      (c)  Silver

      (d)  Iron
Ans (c)

Q.12. Aluminium is

      (a)  Silvery white in colour

      (b)  Yellow in colour

      (c)  Reddish in colour

      (d)  Pale yellow in colour
Ans (a)

Q.13. Which of the following material has the highest melting point

      (a)  Copper 

      (b)  Aluminium

      (c)  Tungsten

      (d)  Gold
Ans (c)

Q.14. Bronze is an alloy of

      (a)  Copper and Tin. 

      (b)  Copper and Steel.

      (c)  Copper and Mercury

      (d)  Copper and Aluminium
Ans (a)

Q.15. Example of high resistivity material is

      (a)  Nichrome

      (b)  Silver

      (c)  Gold

      (d)  Copper
Ans (a)