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MCQs on Engineering Materials

May 2, 2017 by admin

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 1. Which of the following instrument is constructed based on the principle of Hall effect?
(a) Frequency metre.
(b) Ammeter.
(c) Dynamometer.
(d) Gaussmeter.

Answer

           D 

 2. At what transition temperature the mercury becomes a superconductor?
(a) 4.12°F.
(b) 4.12°C.
(c) 4.12 K.
(d) 41.2 K.

Answer

           C 

 3. If the temperature of a paramagnetic material is increases, its magnetic susceptibility
(a) increases.
(b) decreases.
(c) remained same.
(d) none of the above.

Answer

           B 

 4. Which is the most detriment impurity in a magnetic material?
(a) Iron oxide.
(b) Nitrogen.
(c) Carbon.
(d) Ferrite.

Answer

           C 

 5. Which of the following effect is Converse of magnetostriction effect?
(a) Skin effect.
(b) Heartily effect.
(c) Curie effect.
(d) Villari effect.

Answer

           D 

 6. The material having least affinity for moisture is
(a) cotton.
(b) paper.
(c) mica.
(d) wood.

Answer

           C 

 7. Piezoelectricity has when observed in
(a) glass.
(b) mica.
(c) glass.
(d) quartz.

Answer

           D 

 8. Air is a
(a) diamagnetic.
(b) paramagnetic.
(c) ferromagnetic.
(d) antiferromagnetic.

Answer

           A 

 9. If the temperature of a dielectric increases, its ionic polarization polarizability will
(a) increase.
(b) decrease.
(c) remain same.
(d) none of the above.

Answer

           C 

 10. Which of the following is the poorest conductor of electricity?
(a) copper.
(b) aluminium.
(c) carbon.
(d) steel.

Answer

           C 

 11. The property of materials by which they can be drawn into wires is known as
(a) elasticity.
(b) malleability.
(c) plasticity.
(d) ductility.

Answer

           D 

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 12. The Magnetic susceptibility of an ideal superconductor is
(a) minus one.
(b) zero.
(c) one.
(d) infinite.

Answer

           A 

13. The conductivity of a perfect dielectric is
(a) unity.
(b) zero.
(c) negative.
(d) infinite.

Answer

           B 

 14. Forbidden energy gap is largest in
(a) conductor.
(b) semiconductor.
(c) insulator.
(d) none of the above.

Answer

           C 

 15. Forbidden energy gap he is least in
(a) conductor.
(b) semiconductor.
(c) insulator.
(d) none of the above.

Answer

           A 

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