Top 10 Qiskit MCQs for Quantum Computing Learners – Beginner to Intermediate

✔ Scroll down and test yourself — answers are hidden under the “View Answer” button.

1. What is Qiskit?

A. A classical programming language for AI
B. A Python-based framework for quantum computing
C. A hardware device for quantum simulations
D. A cloud storage service

Correct Answer: B

Qiskit is an open-source Python framework for developing and running quantum programs.

2. Which of the following is NOT a component of Qiskit?

A. Qiskit Terra
B. Qiskit Aer
C. Qiskit Ignis
D. Qiskit Neural

Correct Answer: D

Qiskit components: Terra (core), Aer (simulation), Ignis (noise/error), Aqua (algorithms). Neural is not part of Qiskit.

3. What does QuantumCircuit in Qiskit represent?

A. A classical circuit for electrical signals
B. A quantum algorithm execution environment
C. A logical representation of quantum gates and qubits
D. A simulator for classical computers

Correct Answer: C

QuantumCircuit defines the qubits, classical bits, and quantum gates in a program.

4. Which Qiskit module is used for simulating quantum circuits on classical computers?

A. Qiskit Terra
B. Qiskit Aer
C. Qiskit Ignis
D. Qiskit Pulse

Correct Answer: B

Qiskit Aer provides high-performance simulators for testing circuits without actual quantum hardware.

5. What is the purpose of measure() in Qiskit?

A. To apply a quantum gate
B. To convert a qubit state into a classical bit value
C. To reset a qubit
D. To create entanglement

Correct Answer: B

Measurement collapses the qubit into 0 or 1 and stores it in a classical bit.

6. Which gate creates a superposition state from |0⟩ in Qiskit?

A. X gate
B. H gate
C. CNOT gate
D. Z gate

Correct Answer: B

The Hadamard (H) gate puts a qubit into a superposition of |0⟩ and |1⟩.

7. How do you execute a quantum circuit on a simulator in Qiskit?

A. execute(circuit, backend)
B. run(circuit)
C. simulate(circuit)
D. measure(circuit)

Correct Answer: A

execute(circuit, backend) runs the circuit on the specified backend (simulator or real device).

8. What does a CNOT gate do in Qiskit?

A. Flips a target qubit only if the control qubit is |1⟩
B. Flips both qubits simultaneously
C. Creates superposition
D. Measures the qubit

Correct Answer: A

CNOT is a 2-qubit gate that flips the target qubit conditional on the control qubit.

9. Which Qiskit feature allows noise and error modeling?

A. Qiskit Terra
B. Qiskit Ignis
C. Qiskit Pulse
D. Qiskit Experiments

Correct Answer: B

Qiskit Ignis is used for error characterization, mitigation, and noise analysis.

10. How do you visualize the result of a quantum measurement in Qiskit?

A. plot_histogram(result.get_counts(circuit))
B. visualize(result)
C. show_counts(circuit)
D. display(result.measure())

Correct Answer: A

plot_histogram is used to visualize measurement results as a probability histogram.