Selected MCQ

Current Question
In a semiconductor, a p-type material is produced by doping silicon with:
  • A. Pentavalent atoms
  • B. Noble gases
  • C. Trivalent atoms
  • D. Isotopes of silicon only
Correct Answer: C
Explanation:
Trivalent dopants create holes as majority carriers.
Related Question 1
Which material is semiconductor?
  • A. Copper
  • B. Silicon
  • C. Rubber
  • D. Glass
Correct Answer: B
Explanation:
Silicon has intermediate conductivity.
Related Question 2
Which blood type is universal donor?
  • A. A
  • B. B
  • C. AB
  • D. O
Correct Answer: D
Explanation:
O lacks A/B antigens.
Related Question 3
Which reaction type forms larger molecule from smaller ones?
  • A. Decomposition
  • B. Addition
  • C. Substitution
  • D. Elimination
Correct Answer: B
Explanation:
Addition combines molecules.
Related Question 4
Which cell type lacks nucleus?
  • A. Neuron
  • B. RBC
  • C. WBC
  • D. Muscle cell
Correct Answer: B
Explanation:
Mature RBCs lack nucleus.
Related Question 5
Which type of bonding involves delocalized electrons?
  • A. Ionic
  • B. Covalent
  • C. Metallic
  • D. Hydrogen
Correct Answer: C
Explanation:
Metallic bonding features free electrons.