Quantum_computing MCQs

Q1. What is the basic unit of quantum information?

Bit
Qubit
Byte
Register

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Correct: Qubit

Quantum information is stored in qubits.

Q2. Which property allows a qubit to be in multiple states at once?

Entanglement
Superposition
Interference
Decoherence

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Correct: Superposition

Superposition allows multiple states simultaneously.

Q3. What does entanglement mean?

Qubits are independent
Qubits are classically linked
Qubits share correlated states
Qubits are identical

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Correct: Qubits share correlated states

Entangled qubits have correlated states.

Q4. Which gate is a quantum version of NOT gate?

Hadamard
CNOT
Pauli-X
Phase

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Correct: Pauli-X

Pauli-X flips the qubit state.

Q5. Which symbol represents a qubit state?

|0>
<0|
{0}
(0)

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Correct: |0>

Dirac notation |0> represents a qubit state.

Q6. What is a quantum algorithm for factoring large numbers?

Grover's
Shor's
Dijkstra's
Bellman-Ford

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Correct: Shor's

Shor's algorithm factors integers efficiently.

Q7. Which algorithm speeds up database search?

Shor's
RSA
Grover's
FFT

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Correct: Grover's

Grover's algorithm provides quadratic speedup.

Q8. What is decoherence?

State amplification
Loss of quantum behavior
Quantum error correction
State cloning

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Correct: Loss of quantum behavior

Decoherence destroys quantum superposition.

Q9. Which gate creates superposition?

Pauli-X
Hadamard
CNOT
Toffoli

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Correct: Hadamard

Hadamard creates equal superposition.

Q10. What is quantum teleportation?

Physical transport
State transfer using entanglement
Faster-than-light travel
Data copying

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Correct: State transfer using entanglement

Quantum state is transferred via entanglement.