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 the main challenge in scaling up quantum computers?

Classical noise

Electrical interference

Quantum decoherence

2 / 40

What is the outcome of a quantum measurement?

Deterministic

Arbitrary

Probabilistic

3 / 40

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

Dijkstra's algorithm

Grover's algorithm

Shor's algorithm

4 / 40

Which quantum property is utilized in quantum teleportation?

Superposition

Entanglement

Interference

5 / 40

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

Entanglement

Quantum tunneling

Superposition

6 / 40

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

X-gate

H-gate

T-gate

7 / 40

Which gate is used to create superpositions in qubits?

Hadamard gate

Pauli gate

Toffoli gate

8 / 40

What is the state of a qubit described by?

Boolean Value

Wavefunction

Binary Code

9 / 40

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

Entanglement

Interference

Superposition

10 / 40

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

Quantum circuit

Quantum machine

Quantum net

11 / 40

Which quantum algorithm is known for searching unsorted databases efficiently?

Shor's algorithm

Bell's algorithm

Grover's algorithm

12 / 40

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

Z-gate

X-gate

Y-gate

13 / 40

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

Quantum superposition

Quantum coherence

Quantum entanglement

14 / 40

Which quantum phenomenon is essential for quantum cryptography?

Entanglement

Superposition

Decoherence

15 / 40

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

Superposition state

Entangled state

Collapsed state

16 / 40

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

Quantum well

Quantum wire

Quantum dot

17 / 40

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

Quantum parallelism

Finite state machines

Boolean logic

18 / 40

What is the basic unit of quantum information?

Byte

Qubit

Bit

19 / 40

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

Quantum Turing machine

Quantum finite machine

Quantum circuit

20 / 40

What does the Hadamard gate do to a qubit?

Measures qubit

Swaps qubit

Creates superposition

21 / 40

What does the Bloch sphere represent?

Byte states

Qubit states

Bit states

22 / 40

Which quantum gate introduces a phase shift?

X-gate

H-gate

Z-gate

23 / 40

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

Optical quantum computer

Ion trap quantum computer

Superconducting quantum computer

24 / 40

Which physical system can be used to implement a qubit?

Photons

Plasma

Vacuum

25 / 40

How many states can a qubit exist in simultaneously?

Infinite

Three

Two

26 / 40

What principle ensures that quantum information cannot be perfectly copied?

No-deletion theorem

No-cloning theorem

No-disturbance theorem

27 / 40

Which process is necessary for maintaining quantum coherence?

Continuous observation

Coupling with environment

Isolation from environment

28 / 40

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

Coherence time

Computation time

Entanglement time

29 / 40

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

Decoherence

Superposition

Interference

30 / 40

Which theorem underpins the foundation of quantum error correction?

Quantum measurement theorem

Quantum gate theorem

Quantum no-cloning theorem

31 / 40

What is quantum entanglement often referred to as?

Local hidden variables

Classical interference

Spooky action at a distance

32 / 40

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

Sorting numbers

Factoring large numbers

Linear search

33 / 40

What is the term for error correction in quantum computing?

Classical error correction

Error detection

Quantum error correction

34 / 40

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

Proton spin

Electron spin

Neutron spin

35 / 40

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

Z-gate

X-gate

H-gate

36 / 40

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

Remain in superposition

Collapse to one state

Increase coherence

37 / 40

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

Decoherence

Superposition

Entanglement

38 / 40

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

Quantum error correction

State preparation

Superposition

39 / 40

What is a controlled-NOT gate often called?

CCNOT gate

CNOT gate

TOFFOLI gate

40 / 40

What does the term "quantum supremacy" refer to?

Quantum computers performing tasks beyond classical computers

Theoretical superiority of quantum mechanics

Error-free quantum computation

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