Selected MCQ

Current Question
Which of these is a quantum phenomenon not present in classical bits?
  • A. Voltage
  • B. Entanglement
  • C. Resistance
  • D. Capacitance
Correct Answer: B
Explanation:
Quantum entanglement allows qubits to be correlated in ways impossible for classical bits.
Related Question 1
What is a key feature of quantum computing that offers computational advantages?
  • A. Using vacuum tubes
  • B. Superposition and entanglement
  • C. Fiber optic circuits
  • D. DC power only
Correct Answer: B
Explanation:
Quantum superposition and entanglement enable certain calculations to be done much faster.
Related Question 2
What is a major challenge in large-scale quantum computing today?
  • A. Lack of electricity
  • B. Qubit decoherence and error rates
  • C. Too much classical memory
  • D. No known algorithms
Correct Answer: B
Explanation:
Keeping qubits coherent and reducing errors are key challenges in building large quantum computers.
Related Question 3
What is a key feature of quantum computing that can offer speedups?
  • A. Using vacuum tubes
  • B. Superposition and entanglement
  • C. Fiber optic circuits
  • D. DC power only
Correct Answer: B
Explanation:
Quantum superposition and entanglement enable parallelism that can speed up tasks like factoring.
Related Question 4
Which technology helps secure communications using quantum mechanics?
  • A. Quantum key distribution (QKD)
  • B. Standard VPN
  • C. Hashing
  • D. WPA2
Correct Answer: A
Explanation:
QKD uses quantum particles to securely share encryption keys, with eavesdropping detectable.
Related Question 5
Which phenomenon provides evidence that the universe is expanding?
  • A. Galactic collisions
  • B. Redshift of distant galaxies
  • C. Aurora borealis
  • D. Supernova explosions
Correct Answer: B
Explanation:
Edwin Hubble observed that distant galaxies are redshifted, indicating expansion.