Questions

Multiple-choice questions you can practise one by one. Open a question, tap an answer and see at once whether it is right. For a random set, try Quick practice.

138 questions

• Why is conductivity not determined by atom count alone?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• An atom loses one electron while its nucleus remains unchanged. It becomes:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• What is a hole in band theory?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why cannot magnetic class be inferred from resistivity alone?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is a forbidden gap not a physical empty space in a solid?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why does an N-type semiconductor remain electrically neutral overall?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is a semiconductor more than merely a weak conductor?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why is chemical stability important outdoors?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• What is the most defensible reason to compare a material's properties under actual service conditions?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Hard

• Why should temperature be specified when comparing resistivity?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why does an insulator conduct poorly at room temperature?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why is rubber suitable for wire insulation?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• When an electron enters the conduction band, what is left behind?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• A material has a small band gap and intermediate conductivity. It is likely a:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why can a semiconductor conduct more than a typical insulator?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why can doping change semiconductor conductivity?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• For the same material and length, increasing wire area generally:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Why can a hard material still fail under impact?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• Which selection approach is realistic in engineering?

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium

• In N-type semiconductor, majority carriers are:

  Electrical Engineering Materials › Unit 1: Introduction to Materials · Medium