14,988+ Questions · 21 Subjects · Free to Practice

MCQ Questions

Questions

Practice mode — a mixed feed of questions and articles for each subject. Prefer reading first? Browse the Articles index instead →

Articles

Study mode — the full article library for each subject, no practice questions mixed in. Want to practice instead? Browse Questions by subject →

Beyond the base sensor, the research team demonstrated a self-powered version. How does it generate its own power?

Please wait…

1. Beyond the base sensor, the research team demonstrated a self-powered version. How does it generate its own power?

By drawing ambient solar energy through a built-in photovoltaic cell

By extracting thermal energy from the ammonia gas itself

By integrating a flexible piezoelectric nanogenerator that harvests energy from human motion

By using a small onboard lithium battery pack

Loading…

MCQquestion.com

Free MCQ practice for UPSC and State competitive exams — 30,000+ questions across 21 subjects, with the reasoning behind every answer.