ECAT Physics Electronics MCQS Online Test

Physics Electronics MCQS Online Test

ECAT Physics Electronics Chapter Online Test

Total Questions: 177
Time Allowed: 60 Minutes
Total Marks: 177
How to Attempt Test: Please choose the right Option in MCQ-type question.
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1. A pieced of copper and another of germanium are cooled from room temperature to 77 K, the resistance of

2. Zener breakdown in a semiconductor diode occurs when

3. A n-p-n transistor conducts when

4. In a n-p-n transistor:

5. In half wave rectification

6. The critical temperature for mercury is

7. The ratio β represents

 

8. Which logic gate is represented by following diagram?

9. Due to high loop gain of the amplifier, the inverting and non-inverting inputs are

10. The impurity atoms with which a pure silicon should be doped to make a p-type semiconductor is

11. The electromagnetic waves emitted by the LC circuit of areal to a transmitting station are of

12. Light emitting diode work when it is

13. In p – n junction, after diffusion, a charge less region is formed around the junction is called

14. The energy band gap is maximum in

15. Arsenic, antimony or phosphorus are impurities of

16. In junction diode, the holes are because of:

17. The gain A of the amplifier is of the order of

18. Reverse bias applied on a junction diode

19. Which of the following when added as an impurity into the silicon produces n-type semi-conductor?

20. An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a _

21. When a p-n junction diode is reverse biased, the flow of current across the junction is mainly due to

22. When a pentavalent material like As, is added to tetravalent material l.e. Ge, we get a

23. The simplest type of rectification known as half wave rectification is obtained by

24. The least doped region in a transistor is

25. The energy band gap is maximum in


 

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