506. Metal used in the metallization of CMOS circuits is—

1. 1. Gold

   
   
   

   2. Silver

   
   
   

   3. Iron

   
   
   

   4. Aluminium

   
   
   

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   NA

   Correct Option: D

   NA

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507. Photoetching is a process of—

1. 1. Selective removal of a layer

   
   
   

   2. Diffusion of impurities

   
   
   

   3. Removal of photoresist

   
   
   

   4. Making dicing marks
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   Photoetching is a process of selective removal of a layer

   Correct Option: A

   Photoetching is a process of selective removal of a layer

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508. In monolithic IC fabrication process—
     (i) All compounds are fabricated on single crystal of silicon
     (ii) Any value of capacitors and resistors can be fabricated
     (iii) Each transistor is diffused into separate isolation region
     (iv) Common process for different devices are carried out together

1. 1. (i) only

   
   
   

   2. (ii) and (iv) only

   
   
   

   3. (i), (iii) and (iv) only

   
   
   

   4. (i) and (iv) only

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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509. Basic function of SiO₂ is—
     (i) Physical strength
     (ii) Isolation
     (iii) Passivation from external contaminants
     (iv) Electrical connection
     (v) Selective diffusion

1. 1. (ii) only

   
   
   

   2. (iii) and (v) only

   
   
   

   3. (ii), (iii) and (v) only

   
   
   

   4. All

   
   
   

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1. View Hint View Answer Discuss in Forum

   The Basic function of SiO₂ is
   * Isolation
   * Passivation from external contaminants
   * Selective diffusion

   Correct Option: C

   The Basic function of SiO₂ is
   * Isolation
   * Passivation from external contaminants
   * Selective diffusion

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510. The substrate in a monolithic circuit must be connected to—

1. 1. Ground

   
   
   

   2. Supply

   
   
   

   3. Most negative voltage for p-type substrate

   
   
   

   4. Most positive for p-type substrate

   
   
   

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1. View Hint View Answer Discuss in Forum

   The substrate in a monolithic circuit must be connected to most negative voltage for p-type substrate

   Correct Option: C

   The substrate in a monolithic circuit must be connected to most negative voltage for p-type substrate

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