Q. Calculate the ratio of the resistivity of 2 wires having the same length and same resistance with area of cross section 2m² and 5m² respectively.

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Q. Which of the following statements are true with regard to resistivity?

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Q. The reciprocal of resistivity is________

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Q. The resistance of pure metals ___________

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Q. The resistance of insulators __________

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Q. Which of the following statements are true about metals?

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Q. Which of the following statements are true about insulators?

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Q. What is the unit of temperature coefficient?

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Q. A copper coil has a resistance of 200 ohms when its mean temperature is 0 degree centigrade. Calculate the resistance of the coil when its mean temperature is 80 degree centigrade. Temperature coefficient of copper is 0.004041 centigrade¯¹.

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Q. The temperature of a coil cannot be measured by which of the following methods?

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Q. The rise or fall in resistance with the rise in temperature depends on ________

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Q. If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______

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Q. Materials having resistance almost equal to zero is _______

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