1. If the impurity content in metal alloy is increases, its president resistivity is
(a) decreases.
(b) increases.
(c) remain same.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
2. Which of the following metal has lowest temperature coefficient of resistance?
(a) Copper.
(b) Aluminium.
(c) Gold.
(d) Kanthol. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
3. The conductor have transport phenomenon of electrons due to
(a) electric field.
(b) magnetic field.
(c) electromagnetic field.
(d) Lorentz Force. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
4. Which of the following is hard solder?
(a) Lead – tin.
(b) Lead – silver – tin.
(c) Lead – silver.
(d) Copper – zinc. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
5. Piezoelectric material serve as a source of
(a) infrasonic waves.
(b) ultrasonic waves.
(c) x-rays.
(d) resonant waves. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
6. Thermocouple are generally used for the measurement of
(a) core losses.
(b) temperature coefficient.
(c) temperature.
(d) coupling coefficient. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] B [/accordion-item][/accordion]
7. Which of the following material has the highest operating temperature?
(a) Eureka.
(b) Nichrome.
(c) manganin.
(d) kanthal. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
8. The coil of a standard resistance are made by
(a) carbon.
(b) nichrome.
(c) tungsten.
(d) manganin. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
9. The property of absorbing moisture from atmosphere is known as
(a) porosity.
(b) solubility.
(c) viscosity.
(d) hygroscopicity. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
10. For which of the following material Hall coefficient found to be zero?
(a) metal.
(b) non-metal.
(c) insulator.
(d) none of the above. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
11. Ferrimagnetic materials are generally used as
(a) permanent magnet.
(b) insulator.
(c) semiconductor.
(d) conductor. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
12. Which of the following fluorescent material gives red colour fluorescence?
(a) Lead Carbonate.
(b) Calcium Silicate.
(c) Zinc Silicate.
(d) Magnesium Silicate. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] D [/accordion-item][/accordion]
13. Which of the following fluorescent material gives the green colour fluorescence?
(a) Zink Silicate.
(b) Calcium Silicate.
(c) Cerussite.
(d) Magnesium Silicate. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]
14. Which of the following material is mainly used to made permanent magnet?
(a) Ferromagnetic.
(b) Paramagnetic.
(c) Diamagnetic.
(d) soft iron. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] A [/accordion-item][/accordion]
15. Which of the following material is used for the insulator of overhead lines?
(a) Mica.
(b) Varnish.
(c) Porcelain.
(d) Teflon. [accordion clicktoclose=true tag=h4][accordion-item title=”Answer” state=closed] C [/accordion-item][/accordion]