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.
Answer
2. Which of the following metal has lowest temperature coefficient of resistance?
(a) Copper.
(b) Aluminium.
(c) Gold.
(d) Kanthol.
Answer
3. The conductor have transport phenomenon of electrons due to
(a) electric field.
(b) magnetic field.
(c) electromagnetic field.
(d) Lorentz Force.
Answer
4. Which of the following is hard solder?
(a) Lead – tin.
(b) Lead – silver – tin.
(c) Lead – silver.
(d) Copper – zinc.
Answer
5. Piezoelectric material serve as a source of
(a) infrasonic waves.
(b) ultrasonic waves.
(c) x-rays.
(d) resonant waves.
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6. Thermocouple are generally used for the measurement of
(a) core losses.
(b) temperature coefficient.
(c) temperature.
(d) coupling coefficient.
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7. Which of the following material has the highest operating temperature?
(a) Eureka.
(b) Nichrome.
(c) manganin.
(d) kanthal.
Answer
8. The coil of a standard resistance are made by
(a) carbon.
(b) nichrome.
(c) tungsten.
(d) manganin.
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9. The property of absorbing moisture from atmosphere is known as
(a) porosity.
(b) solubility.
(c) viscosity.
(d) hygroscopicity.
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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.
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11. Ferrimagnetic materials are generally used as
(a) permanent magnet.
(b) insulator.
(c) semiconductor.
(d) conductor.
Answer
12. Which of the following fluorescent material gives red colour fluorescence?
(a) Lead Carbonate.
(b) Calcium Silicate.
(c) Zinc Silicate.
(d) Magnesium Silicate.
Answer
13. Which of the following fluorescent material gives the green colour fluorescence?
(a) Zink Silicate.
(b) Calcium Silicate.
(c) Cerussite.
(d) Magnesium Silicate.
Answer
14. Which of the following material is mainly used to made permanent magnet?
(a) Ferromagnetic.
(b) Paramagnetic.
(c) Diamagnetic.
(d) soft iron.
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15. Which of the following material is used for the insulator of overhead lines?
(a) Mica.
(b) Varnish.
(c) Porcelain.
(d) Teflon.
Answer