Qubits Quiz 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 a quantum computer's equivalent of a classical Turing machine?

Quantum Turing machine

Quantum circuit

Quantum finite machine

2 / 40

What does the Hadamard gate do to a qubit?

Swaps qubit

Measures qubit

Creates superposition

3 / 40

What does the Bloch sphere represent?

Byte states

Qubit states

Bit states

4 / 40

What is the term for error correction in quantum computing?

Error detection

Quantum error correction

Classical error correction

5 / 40

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

Quantum well

Quantum wire

Quantum dot

6 / 40

What is the main challenge in scaling up quantum computers?

Quantum decoherence

Classical noise

Electrical interference

7 / 40

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

Entanglement

Interference

Superposition

8 / 40

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

Factoring large numbers

Linear search

Sorting numbers

9 / 40

How many states can a qubit exist in simultaneously?

Infinite

Three

Two

10 / 40

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

Z-gate

X-gate

H-gate

11 / 40

What is a controlled-NOT gate often called?

TOFFOLI gate

CNOT gate

CCNOT gate

12 / 40

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

Boolean logic

Quantum parallelism

Finite state machines

13 / 40

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

Grover's algorithm

Shor's algorithm

Dijkstra's algorithm

14 / 40

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

Optical quantum computer

Ion trap quantum computer

Superconducting quantum computer

15 / 40

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

Superposition

State preparation

Quantum error correction

16 / 40

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

Quantum machine

Quantum circuit

Quantum net

17 / 40

What is the state of a qubit described by?

Wavefunction

Binary Code

Boolean Value

18 / 40

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

Decoherence

Interference

Superposition

19 / 40

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

Proton spin

Electron spin

Neutron spin

20 / 40

Which quantum property is utilized in quantum teleportation?

Interference

Superposition

Entanglement

21 / 40

What is the basic unit of quantum information?

Bit

Byte

Qubit

22 / 40

Which process is necessary for maintaining quantum coherence?

Isolation from environment

Coupling with environment

Continuous observation

23 / 40

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

Superposition state

Entangled state

Collapsed state

24 / 40

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

H-gate

X-gate

T-gate

25 / 40

Which quantum gate introduces a phase shift?

Z-gate

H-gate

X-gate

26 / 40

Which theorem underpins the foundation of quantum error correction?

Quantum no-cloning theorem

Quantum gate theorem

Quantum measurement theorem

27 / 40

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

Quantum coherence

Quantum superposition

Quantum entanglement

28 / 40

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

Increase coherence

Collapse to one state

Remain in superposition

29 / 40

Which quantum algorithm is known for searching unsorted databases efficiently?

Grover's algorithm

Bell's algorithm

Shor's algorithm

30 / 40

What is the outcome of a quantum measurement?

Probabilistic

Arbitrary

Deterministic

31 / 40

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

Z-gate

Y-gate

X-gate

32 / 40

What does the term "quantum supremacy" refer to?

Error-free quantum computation

Theoretical superiority of quantum mechanics

Quantum computers performing tasks beyond classical computers

33 / 40

What is quantum entanglement often referred to as?

Spooky action at a distance

Local hidden variables

Classical interference

34 / 40

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

Entanglement time

Computation time

Coherence time

35 / 40

Which quantum phenomenon is essential for quantum cryptography?

Decoherence

Superposition

Entanglement

36 / 40

What principle ensures that quantum information cannot be perfectly copied?

No-cloning theorem

No-disturbance theorem

No-deletion theorem

37 / 40

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

Quantum tunneling

Superposition

Entanglement

38 / 40

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

Decoherence

Entanglement

Superposition

39 / 40

Which physical system can be used to implement a qubit?

Photons

Plasma

Vacuum

40 / 40

Which gate is used to create superpositions in qubits?

Hadamard gate

Toffoli gate

Pauli gate

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