निम्नलिखित में से किस उपकरण में प्रकाश ऊर्जा को विद्युत ऊर्जा में परिवर्तित किया जाता है?

Which of the following is a primary application of a Unijunction Transistor (UJT)?

Which of the following statements accurately describes the active region of an NPN transistor's characteristics?

Which of the following semiconductor devices can act as a simple electronic switch?