IBM A1000-112: Assessment: Fundamentals of Quantum Computation Using Qiskit v0.2x Developer Practice Exam: Test Your Knowledge 2025

What is the fundamental difference between a classical bit and a quantum bit (qubit)?

In Qiskit, which method is used to execute a quantum circuit on a backend simulator or real quantum hardware?

Which quantum gate is used to create entanglement between two qubits when applied after a Hadamard gate?

A developer needs to visualize the quantum state vector of a circuit after execution on a statevector simulator. Which Qiskit method should they use?

What happens to a qubit in superposition when it is measured?

A quantum developer is building a circuit in Qiskit and needs to add a Hadamard gate to qubit 2. Which code correctly accomplishes this?

Which of the following quantum algorithms provides a quadratic speedup for searching an unsorted database?

A developer notices that their quantum circuit produces different results each time it runs on a simulator with the same initial conditions. What is the most likely cause?

In Qiskit, what is the purpose of the transpile() function?

Which property of quantum systems allows quantum computers to process multiple computational paths simultaneously?

A developer wants to implement a quantum oracle for Grover's algorithm that marks the state |101⟩. Which combination of gates would correctly implement this phase oracle?

When executing a circuit on real quantum hardware versus a simulator, which additional consideration is most important?

In Qiskit, which code correctly creates a quantum circuit with 3 qubits and 3 classical bits, then measures all qubits into the classical bits?

Which statement best describes quantum entanglement?

A researcher is implementing the Quantum Fourier Transform (QFT) as part of Shor's algorithm. What is the primary purpose of the QFT in this context?

When using the Aer simulator in Qiskit, which backend should be selected to obtain the complete quantum state vector after circuit execution without performing measurements?

A developer needs to apply a controlled rotation around the Y-axis by angle π/4 to a target qubit, controlled by another qubit. Which Qiskit method should be used?

In the context of variational quantum algorithms like VQE (Variational Quantum Eigensolver), what is the role of the classical optimizer?

A quantum circuit executed on hardware returns measurement counts that significantly deviate from the expected theoretical probabilities. Which technique would best help improve the results?

Which quantum algorithm demonstrates exponential speedup over classical algorithms for determining whether a function is constant or balanced?