Official Question Bank Samples
Nepal Engineering Council (NEC) Model Questions & Detailed Solutions
Representative Computer Engineering questions prepared according to NEC syllabus standards | Engilicense
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Q1. How does a pure intrinsic semiconductor behave at absolute zero temperature (0 K)?
A) Conductor
✓ B) Insulator (Correct Answer)
C) Semiconductor
D) Protection device
Explanation: At absolute zero (0 K = -273.15°C), there is zero thermal kinetic energy in the semiconductor crystal lattice. All valence electrons remain firmly bound in covalent bonds, leaving the conduction band entirely empty and the valence band completely filled. With no free charge carriers, an intrinsic semiconductor acts as an ideal electrical insulator.
Q2. The temperature dependence of electrical resistance in pure semiconductors is classified as having a:
A) High resistance
B) Positive temperature co-efficient
✓ C) Negative temperature co-efficient (Correct Answer)
D) Low resistance
Explanation: Metals have a Positive Temperature Coefficient (PTC) because increased thermal vibrations impede electron drift. Pure semiconductors possess a Negative Temperature Coefficient (NTC): as temperature rises, thermal energy breaks covalent bonds, exponentially generating electron-hole pairs, which increases electrical conductivity and reduces resistance.
Q3. Which scheduling algorithm is non-preemptive and selects the process with the shortest execution burst?
A) Round Robin (RR)
✓ B) Shortest Job First (SJF) (Correct Answer)
C) Shortest Remaining Time First (SRTF)
D) Priority Scheduling with preemption
Explanation: Shortest Job First (SJF) in its standard non-preemptive form picks the waiting process with the smallest CPU burst time. Shortest Remaining Time First (SRTF) is the preemptive variant of SJF.
Q4. In relational databases, which normal form eliminates transitive dependencies?
A) First Normal Form (1NF)
B) Second Normal Form (2NF)
✓ C) Third Normal Form (3NF) (Correct Answer)
D) Boyce-Codd Normal Form (BCNF)
Explanation: 1NF eliminates repeating groups and composite attributes. 2NF removes partial functional dependencies on candidate keys. 3NF removes transitive dependencies (where a non-prime attribute determines another non-prime attribute).
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