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Quantum Computing – The Future of Computing MCQs

1. : What is the fundamental unit of information in quantum computing?

(A) Byte


(B) Bit


(C) Qubit


(D) Photon



 

2. : Which phenomenon allows a qubit to be in multiple states at once?

(A) Polarization


(B) Entanglement


(C) Decoherence


(D) Superposition



 

3. : Which property of quantum particles allows qubits to be linked regardless of distance?

(A) Coherence


(B) Entanglement


(C) Spin


(D) Tunneling



 

4. : What is the major challenge in building scalable quantum computers?

(A) High electricity cost


(B) Lack of programming languages


(C) Qubit decoherence


(D) Absence of cloud support



 

5. : Who is considered one of the pioneers of quantum computing for proposing quantum gates?

(A) Richard Feynman


(B) David Deutsch


(C) Peter Shor


(D) Alan Turing



 

6. : What algorithm, developed by Peter Shor, can factor large numbers exponentially faster than classical computers?

(A) Deutsch’s Algorithm


(B) Grover’s Algorithm


(C) Shor’s Algorithm


(D) Simon’s Algorithm



 

7. : What quantum algorithm is used for unstructured database searching?

(A) Shor’s Algorithm


(B) Grover’s Algorithm


(C) Deutsch’s Algorithm


(D) Bell’s Algorithm



 

8. : Which tech company developed the quantum processor called “Sycamore”?

(A) IBM


(B) Microsoft


(C) Google


(D) Intel



 

9. : What programming framework does IBM use for quantum computing?

(A) Cirq


(B) Qiskit


(C) Q#


(D) QuTiP



 

10. : Which quantum computing model is based on quantum annealing?

(A) IBM Q


(B) Microsoft Q#


(C) D-Wave


(D) Google Sycamore



 

11. : What is quantum decoherence?

(A) Stabilizing qubits for long time


(B) Making qubits classical


(C) Loss of quantum behavior due to environment


(D) Cooling qubits to zero



 

12. : What is the key advantage of quantum computing over classical computing?

(A) Lower power consumption


(B) Better user interface


(C) Parallelism through superposition


(D) Smaller physical size



 

13. : What term describes quantum error caused by environmental interference?

(A) Noise


(B) Latency


(C) Error rate


(D) Entanglement



 

14. : Which of the following is a quantum programming language by Microsoft?

(A) Q#


(B) Qiskit


(C) Q++


(D) Quantum-Python



 

15. : What type of particle behavior is exploited in quantum computing?

(A) Newtonian


(B) Classical


(C) Quantum mechanical


(D) Thermodynamic



 

16. : Which of the following is not a use case of quantum computing?

(A) Cryptography


(B) Weather forecasting


(C) Gaming graphics


(D) Drug discovery



 

17. : What hardware component is crucial for controlling qubits in a quantum computer?

(A) Laser system


(B) Magnetic coil


(C) Cryogenic refrigerator


(D) Resistor



 

18. : What is the Heisenberg uncertainty principle related to in quantum computing?

(A) Computational limits


(B) Measurement limitations


(C) Bit flip errors


(D) Data storage



 

19. : What is a Hadamard gate used for?

(A) Creating entanglement


(B) Measuring qubit spin


(C) Initiating superposition


(D) Resetting qubits



 

20. : What is the state of a qubit called before measurement?

(A) Collapsed state


(B) Classical state


(C) Superposed state


(D) Zero state



 

21. : What is quantum supremacy?

(A) Quantum computers replacing classical computers


(B) Performing a task classical computers can’t do in reasonable time


(C) Dominance in military quantum tech


(D) Supremacy in data storage



 

22. : Which company first claimed to achieve quantum supremacy in 2019?

(A) IBM


(B) Intel


(C) Google


(D) Microsoft



 

23. : What does “coherence time” mean in quantum computing?

(A) Time to power on qubits


(B) Time qubit retains its state


(C) Time to perform a computation


(D) Time for measurement



 

24. : What quantum computing model uses logic gates like classical computers?

(A) Quantum annealing model


(B) Adiabatic model


(C) Gate-based model


(D) Topological model



 

25. : What is used to cool quantum processors?

(A) Liquid nitrogen


(B) Liquid oxygen


(C) Dilution refrigerator


(D) Helium fan



 

26. : Which quantum concept allows faster factorization in Shor’s algorithm?

(A) Quantum tunneling


(B) Superposition


(C) Quantum Fourier transform


(D) Measurement collapse



 

27. : What is a key benefit of quantum entanglement?

(A) Easy replication


(B) Secure communication


(C) Qubit heating


(D) Better voltage control



 

28. : Which industry is expected to benefit most from quantum optimization algorithms?

(A) Banking


(B) Aviation


(C) Logistics and supply chain


(D) Food processing



 

29. : What does the Bloch sphere represent?

(A) A quantum server


(B) Qubit states geometrically


(C) Heat dissipation in qubits


(D) Entanglement diagrams



 

30. : What is quantum teleportation?

(A) Transferring data over Wi-Fi


(B) Moving objects physically


(C) Transmitting quantum states


(D) Real-time cloud syncing



 

31. : Which of these is a quantum cloud computing platform?

(A) Amazon QubitNet


(B) Google Cloud Quantum


(C) IBM Quantum Experience


(D) Microsoft QuantumLink



 

32. : What does QKD stand for in quantum communication?

(A) Quantum Key Distribution


(B) Quantum Knowledge Device


(C) Quick Key Deployment


(D) Quantum Kinetic Dynamics



 

33. : What is a qudit?

(A) Classical replacement of qubit


(B) Qubit with more than 2 levels


(C) Measurement tool


(D) Memory gate



 

34. : What quantum computing term refers to the transformation of qubit states?

(A) Rotation


(B) Transition


(C) Quantum gate


(D) Dephasing



 

35. : Which of these uses trapped ion technology for quantum computing?

(A) IBM


(B) Honeywell


(C) D-Wave


(D) Microsoft



 

36. : What is the expected impact of quantum computing on cryptography?

(A) Strengthen current encryption


(B) Break many current encryption schemes


(C) Replace digital signatures


(D) Remove need for passwords



 

37. : What is the unit of quantum information entropy?

(A) Byte


(B) Shannon


(C) Qubit


(D) Bit



 

38. : In quantum computing, what is the process of measuring a qubit known to cause?

(A) Superposition


(B) Collapse


(C) Dephasing


(D) Noise



 

39. : What kind of problem is Grover’s algorithm best suited for?

(A) Optimization


(B) Sorting


(C) Searching


(D) Factorizing



 

40. : What makes classical error correction ineffective in quantum systems?

(A) Lack of binary states


(B) Quantum no-cloning theorem


(C) Inability to cool qubits


(D) High power consumption



 

41. : What technology is needed to simulate quantum systems accurately?

(A) Artificial Intelligence


(B) Blockchain


(C) Quantum Computers


(D) GPUs



 

42. : What is the Pauli-X gate equivalent to in classical computing?

(A) NOT gate


(B) AND gate


(C) OR gate


(D) NAND gate



 

43. : Which term refers to the quantum version of a classical circuit?

(A) Q-circuit


(B) Quantum schema


(C) Quantum logic circuit


(D) Super circuit



 

44. : What challenge does quantum error correction address?

(A) Increasing qubit size


(B) Slowing computation


(C) Protecting quantum states from decoherence


(D) Overheating



 

45. : What is the main reason quantum computing is not yet mainstream?

(A) Lack of skilled developers


(B) Lack of Internet support


(C) Technical challenges in stability and scaling


(D) No funding



 

46. : Who first proposed quantum computing in the 1980s?

(A) Alan Turing


(B) Peter Shor


(C) Richard Feynman


(D) David Deutsch



 

47. : What kind of architecture is used in gate-based quantum computing?

(A) Register-based


(B) Grid-based


(C) Circuit-based


(D) Tree-based



 

48. : Which branch of physics does quantum computing fundamentally rely on?

(A) Relativity


(B) Thermodynamics


(C) Quantum mechanics


(D) Electromagnetism



 

49. : What organization launched the OpenQASM language?

(A) Google


(B) IBM


(C) Microsoft


(D) D-Wave



 

50. : Which of the following is a quantum advantage example?

(A) Faster email processing


(B) Faster integer addition


(C) Solving prime factorization exponentially faster


(D) Booting faster than classical systems



 
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