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

Spooky action at a distance

Local hidden variables

2 / 40

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

Superposition

Quantum tunneling

Entanglement

3 / 40

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

Entangled state

Superposition state

Collapsed state

4 / 40

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

Quantum circuit

Quantum net

Quantum machine

5 / 40

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

Dijkstra's algorithm

Shor's algorithm

Grover's algorithm

6 / 40

What does the Bloch sphere represent?

Qubit states

Bit states

Byte states

7 / 40

What is the outcome of a quantum measurement?

Arbitrary

Deterministic

Probabilistic

8 / 40

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

Sorting numbers

Factoring large numbers

Linear search

9 / 40

What is the term for error correction in quantum computing?

Classical error correction

Error detection

Quantum error correction

10 / 40

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

Finite state machines

Quantum parallelism

Boolean logic

11 / 40

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

Remain in superposition

Increase coherence

Collapse to one state

12 / 40

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

Decoherence

Entanglement

Superposition

13 / 40

Which quantum property is utilized in quantum teleportation?

Entanglement

Interference

Superposition

14 / 40

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

Superconducting quantum computer

Optical quantum computer

Ion trap quantum computer

15 / 40

How many states can a qubit exist in simultaneously?

Infinite

Two

Three

16 / 40

What does the Hadamard gate do to a qubit?

Swaps qubit

Measures qubit

Creates superposition

17 / 40

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

Entanglement time

Coherence time

Computation time

18 / 40

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

Quantum superposition

Quantum coherence

Quantum entanglement

19 / 40

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

Electron spin

Neutron spin

Proton spin

20 / 40

Which quantum algorithm is known for searching unsorted databases efficiently?

Grover's algorithm

Shor's algorithm

Bell's algorithm

21 / 40

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

X-gate

T-gate

H-gate

22 / 40

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

Quantum finite machine

Quantum Turing machine

Quantum circuit

23 / 40

Which quantum gate introduces a phase shift?

X-gate

H-gate

Z-gate

24 / 40

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

Quantum well

Quantum dot

Quantum wire

25 / 40

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

Decoherence

Interference

Superposition

26 / 40

Which theorem underpins the foundation of quantum error correction?

Quantum gate theorem

Quantum measurement theorem

Quantum no-cloning theorem

27 / 40

What is the state of a qubit described by?

Boolean Value

Binary Code

Wavefunction

28 / 40

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

Entanglement

Superposition

Interference

29 / 40

What is the basic unit of quantum information?

Byte

Qubit

Bit

30 / 40

Which gate is used to create superpositions in qubits?

Pauli gate

Hadamard gate

Toffoli gate

31 / 40

What principle ensures that quantum information cannot be perfectly copied?

No-disturbance theorem

No-cloning theorem

No-deletion theorem

32 / 40

Which physical system can be used to implement a qubit?

Photons

Plasma

Vacuum

33 / 40

What is a controlled-NOT gate often called?

TOFFOLI gate

CCNOT gate

CNOT gate

34 / 40

Which quantum phenomenon is essential for quantum cryptography?

Decoherence

Entanglement

Superposition

35 / 40

Which process is necessary for maintaining quantum coherence?

Continuous observation

Isolation from environment

Coupling with environment

36 / 40

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

Y-gate

X-gate

Z-gate

37 / 40

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

Superposition

State preparation

Quantum error correction

38 / 40

What does the term "quantum supremacy" refer to?

Error-free quantum computation

Quantum computers performing tasks beyond classical computers

Theoretical superiority of quantum mechanics

39 / 40

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

X-gate

H-gate

Z-gate

40 / 40

What is the main challenge in scaling up quantum computers?

Classical noise

Electrical interference

Quantum decoherence

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