1. Which of the following instrument is constructed based on the principle of Hall effect?
(a) Frequency metre.
(b) Ammeter.
(c) Dynamometer.
(d) Gaussmeter. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
4. Which is the most detriment impurity in a magnetic material?
(a) Iron oxide.
(b) Nitrogen.
(c) Carbon.
(d) Ferrite. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
5. Which of the following effect is Converse of magnetostriction effect?
(a) Skin effect.
(b) Heartily effect.
(c) Curie effect.
(d) Villari effect. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
6. The material having least affinity for moisture is
(a) cotton.
(b) paper.
(c) mica.
(d) wood. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
7. Piezoelectricity has when observed in
(a) glass.
(b) mica.
(c) glass.
(d) quartz. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
8. Air is a
(a) diamagnetic.
(b) paramagnetic.
(c) ferromagnetic.
(d) antiferromagnetic. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
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. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
10. Which of the following is the poorest conductor of electricity?
(a) copper.
(b) aluminium.
(c) carbon.
(d) steel. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
11. The property of materials by which they can be drawn into wires is known as
(a) elasticity.
(b) malleability.
(c) plasticity.
(d) ductility. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
12. The Magnetic susceptibility of an ideal superconductor is
(a) minus one.
(b) zero.
(c) one.
(d) infinite. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
13. The conductivity of a perfect dielectric is
(a) unity.
(b) zero.
(c) negative.
(d) infinite. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
14. Forbidden energy gap is largest in
(a) conductor.
(b) semiconductor.
(c) insulator.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
15. Forbidden energy gap he is least in
(a) conductor.
(b) semiconductor.
(c) insulator.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]