Qubits MCQs with Answers

Welcome to the Qubits MCQs with Answers. In this post, we have shared Qubits Online Test for different competitive exams. Find practice Qubits Practice Questions with answers in Physics Tests exams here. Each question offers a chance to enhance your knowledge regarding Qubits.

Qubits Online Quiz

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• Test Name: Qubits MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Qubits

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1 / 40

What is quantum entanglement often referred to as?

Classical interference

Local hidden variables

Spooky action at a distance

2 / 40

Which gate is a fundamental quantum gate that performs a NOT operation?

Z-gate

Y-gate

X-gate

3 / 40

Which concept is unique to quantum computing compared to classical computing?

Boolean logic

Quantum parallelism

Finite state machines

4 / 40

What is a quantum computer's version of a classical circuit?

Quantum net

Quantum machine

Quantum circuit

5 / 40

What is a common physical representation of a qubit in quantum computers?

Proton spin

Neutron spin

Electron spin

6 / 40

Which theorem underpins the foundation of quantum error correction?

Quantum no-cloning theorem

Quantum gate theorem

Quantum measurement theorem

7 / 40

What is the state of a qubit after a measurement has been performed?

Collapsed state

Entangled state

Superposition state

8 / 40

Which quantum phenomenon is essential for quantum cryptography?

Entanglement

Decoherence

Superposition

9 / 40

What is a quantum computer's equivalent of a classical Turing machine?

Quantum finite machine

Quantum circuit

Quantum Turing machine

10 / 40

Which gate is used to create superpositions in qubits?

Hadamard gate

Pauli gate

Toffoli gate

11 / 40

Which physical system can be used to implement a qubit?

Plasma

Photons

Vacuum

12 / 40

What phenomenon allows a qubit to be in multiple states at once?

Superposition

Decoherence

Entanglement

13 / 40

What describes the ability of qubits to retain information over time without decohering?

Coherence time

Computation time

Entanglement time

14 / 40

Which process is necessary for maintaining quantum coherence?

Continuous observation

Coupling with environment

Isolation from environment

15 / 40

Which principle states that a quantum system remains in a superposition state until measured?

Quantum entanglement

Quantum coherence

Quantum superposition

16 / 40

What is the quantum equivalent of a classical bit flip operation?

H-gate

T-gate

X-gate

17 / 40

What does the Hadamard gate do to a qubit?

Measures qubit

Creates superposition

Swaps qubit

18 / 40

What type of computation can potentially be exponentially faster using qubits?

Sorting numbers

Factoring large numbers

Linear search

19 / 40

How many states can a qubit exist in simultaneously?

Two

Three

Infinite

20 / 40

What is the basic unit of quantum information?

Byte

Bit

Qubit

21 / 40

Which physical realization of a qubit is based on manipulating single electrons in semiconductors?

Quantum well

Quantum wire

Quantum dot

22 / 40

Which quantum algorithm is known for searching unsorted databases efficiently?

Grover's algorithm

Bell's algorithm

Shor's algorithm

23 / 40

Which quantum gate introduces a phase shift?

H-gate

Z-gate

X-gate

24 / 40

What quantum principle allows a single quantum bit to represent multiple states simultaneously?

Superposition

Quantum tunneling

Entanglement

25 / 40

What does the term "quantum supremacy" refer to?

Theoretical superiority of quantum mechanics

Error-free quantum computation

Quantum computers performing tasks beyond classical computers

26 / 40

What is the process of initializing a qubit to a known state?

Superposition

Quantum error correction

State preparation

27 / 40

Which quantum property is utilized in quantum teleportation?

Entanglement

Superposition

Interference

28 / 40

What is the name of the algorithm for factoring integers efficiently using quantum computers?

Grover's algorithm

Dijkstra's algorithm

Shor's algorithm

29 / 40

What is a controlled-NOT gate often called?

CNOT gate

CCNOT gate

TOFFOLI gate

30 / 40

What principle ensures that quantum information cannot be perfectly copied?

No-cloning theorem

No-disturbance theorem

No-deletion theorem

31 / 40

What quantum gate is equivalent to a 180-degree rotation around the Z-axis?

Z-gate

X-gate

H-gate

32 / 40

What is the term for error correction in quantum computing?

Classical error correction

Error detection

Quantum error correction

33 / 40

What does the Bloch sphere represent?

Qubit states

Byte states

Bit states

34 / 40

What term describes the loss of quantum information to the environment?

Interference

Superposition

Decoherence

35 / 40

What is the result of measuring a qubit in a superposition state?

Collapse to one state

Remain in superposition

Increase coherence

36 / 40

What is the outcome of a quantum measurement?

Probabilistic

Arbitrary

Deterministic

37 / 40

What property allows qubits to be interconnected in ways classical bits can't?

Entanglement

Superposition

Interference

38 / 40

What is the state of a qubit described by?

Binary Code

Wavefunction

Boolean Value

39 / 40

What is the main challenge in scaling up quantum computers?

Quantum decoherence

Classical noise

Electrical interference

40 / 40

What type of quantum computer uses superconducting circuits to represent qubits?

Optical quantum computer

Ion trap quantum computer

Superconducting quantum computer

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