265- Materials l d. e. purity of metal all of the above 29. The \'IC Chips\' use

Question

265- Materials l d. e. purity of metal all of the above 29. The 'IC Chips' used in computers and microprocessors are m are made of a. pure gold b. pure silicon c. silcom having desired impurities d. germanium having silicon and arsenic as impurities 30. O n increasing impurity concentration in the metal the residual part of the resistivity a. decreases b. increases c. remain constant d. may increase or decease 31. The band gap energy is: a. the energy level at Fermi level b. only positive in semiconductors c. the energy difference between the conduction and valence band d. responsible for van-der-walls bonding 32. The conductivity of cobalt at room temperature (25°C) is 1.60256 x 10s (1/ohm- cm), find the temperature at which the conductivity is three times that of room temperature. Assume a 0.006 chm-om/'C a, -85°C b. -75oC c. -65°C d. -135°C 33. Which of the following procedures would not be expected to increase the fatigue- crack initiation life of a plain low-carbon steel? a. case hardening b. shot peening c. decreasing the grain size d. annealing 34. A pressure and temperature at which three phases of a single materials are in equilibrium is known as a. tie line b. triple point c. lever point d. none of the above

Explanation / Answer

Solution:

29) The 'IC' chips used in computers and microprocessor are made of pure silicon.

Pure silicon is the basis for the most of integrated circuit. It provides the base, or substrate for the entire chip . A computer is any small electronic device that contains an integrated circuit. The silicon materails is available in abundance that its the most economical materails to use and highly polished. Also low power requirement, high reliability and it is good resistance & pass along electric current very easily, also speedy response.

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