Question: The strength of a semiconductor crystal comes from______________?

• 1. Forces between nuclei
• 2. Forces between protons
• 3. Electron-pair bonds
• 4. None of the above

Question: A semiconductor is formed by ______________bonds?

• 1. Covalent
• 2. Electrovalent
• 3. Co-ordinate
• 4. None of the above

Question: The resistivity of a pure silicon is about _______________?

• 1. 100 O cm
• 2. 6000 O cm
• 3. 3 x 105 O m
• 4. 6 x 10-8 O cm

Question: When a pentavalent impurity is added to a pure semiconductor, it becomes________________?

• 1. An insulator
• 2. An intrinsic semiconductor
• 3. p-type semiconductor
• 4. n-type semiconductor

Question: An n-type semiconductor is______________?

• 1. Positively charged
• 2. Negatively charged
• 3. Electrically neutral
• 4. None of the above

Question: Addition of pentavalent impurity to a semiconductor creates many________________?

• 1. Free electrons
• 2. Holes
• 3. Valence electrons
• 4. Bound electrons

Question: When a pure semiconductor is heated, its resistance_________________?

• 1. Goes up
• 2. Goes down
• 3. Remains the same
• 4. Can’t say

Question: A semiconductor has generally_______________valence electrons?

• 1. 2
• 2. 3
• 3. 6
• 4. 4

Question: A semiconductor has ______________ temperature coefficient of resistance?

• 1. Positive
• 2. Zero
• 3. Negative
• 4. None of the above

Question: The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?

• 1. The same as
• 2. Less than
• 3. More than
• 4. None of the above