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

Which quantum phenomenon is essential for quantum cryptography?

Entanglement

Decoherence

Superposition

2 / 40

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

Quantum superposition

Quantum coherence

Quantum entanglement

3 / 40

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

Quantum net

Quantum circuit

Quantum machine

4 / 40

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

T-gate

X-gate

H-gate

5 / 40

Which quantum property is utilized in quantum teleportation?

Entanglement

Interference

Superposition

6 / 40

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

Increase coherence

Remain in superposition

Collapse to one state

7 / 40

Which physical system can be used to implement a qubit?

Photons

Vacuum

Plasma

8 / 40

What does the Hadamard gate do to a qubit?

Creates superposition

Measures qubit

Swaps qubit

9 / 40

How many states can a qubit exist in simultaneously?

Three

Infinite

Two

10 / 40

Which quantum gate introduces a phase shift?

Z-gate

X-gate

H-gate

11 / 40

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

Factoring large numbers

Sorting numbers

Linear search

12 / 40

Which quantum algorithm is known for searching unsorted databases efficiently?

Bell's algorithm

Grover's algorithm

Shor's algorithm

13 / 40

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

Quantum parallelism

Boolean logic

Finite state machines

14 / 40

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

X-gate

Y-gate

Z-gate

15 / 40

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

Interference

Superposition

Entanglement

16 / 40

What is the state of a qubit described by?

Binary Code

Wavefunction

Boolean Value

17 / 40

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

Entanglement time

Computation time

Coherence time

18 / 40

What is the term for error correction in quantum computing?

Quantum error correction

Error detection

Classical error correction

19 / 40

What is the basic unit of quantum information?

Byte

Bit

Qubit

20 / 40

Which theorem underpins the foundation of quantum error correction?

Quantum gate theorem

Quantum measurement theorem

Quantum no-cloning theorem

21 / 40

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

Entanglement

Superposition

Quantum tunneling

22 / 40

What does the Bloch sphere represent?

Byte states

Qubit states

Bit states

23 / 40

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

Quantum wire

Quantum well

Quantum dot

24 / 40

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

Optical quantum computer

Superconducting quantum computer

Ion trap quantum computer

25 / 40

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

Entanglement

Superposition

Decoherence

26 / 40

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

State preparation

Superposition

Quantum error correction

27 / 40

Which process is necessary for maintaining quantum coherence?

Coupling with environment

Isolation from environment

Continuous observation

28 / 40

What is quantum entanglement often referred to as?

Spooky action at a distance

Classical interference

Local hidden variables

29 / 40

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

Interference

Decoherence

Superposition

30 / 40

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

X-gate

H-gate

Z-gate

31 / 40

What is the outcome of a quantum measurement?

Arbitrary

Probabilistic

Deterministic

32 / 40

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

Grover's algorithm

Shor's algorithm

Dijkstra's algorithm

33 / 40

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

Electron spin

Neutron spin

Proton spin

34 / 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

35 / 40

Which gate is used to create superpositions in qubits?

Toffoli gate

Pauli gate

Hadamard gate

36 / 40

What is a controlled-NOT gate often called?

CCNOT gate

TOFFOLI gate

CNOT gate

37 / 40

What principle ensures that quantum information cannot be perfectly copied?

No-deletion theorem

No-disturbance theorem

No-cloning theorem

38 / 40

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

Quantum Turing machine

Quantum circuit

Quantum finite machine

39 / 40

What is the main challenge in scaling up quantum computers?

Electrical interference

Quantum decoherence

Classical noise

40 / 40

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

Superposition state

Collapsed state

Entangled state

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