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MCQOPTIONS
This section includes 155 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A particular intrinsic semiconductor has a resistivity of 50 (ohm-cm) at T = 300 K and 5 (ohm-cm) at T = 330 K. If change in mobility with temperature is neglected, the bandgap energy of the semiconductor is |
| A. | 1.9 eV |
| B. | 1.3 eV |
| C. | 2.6 eV |
| D. | 0.64 eV |
| Answer» C. 2.6 eV | |
| 2. |
Six volts is applied across a 2 cm long semiconductor bar. The average drift velocity is 104 cms. The electron mobility is |
| A. | 4396 cm2/V-s 2 |
| B. | 3 x 104 cm2/V-s |
| C. | 6 x 104 cm2V-s |
| D. | 3333 cm2/V-s |
| Answer» E. | |
| 3. |
A silicon sample doped n type at 10^18 cm3 have a resistance of 10 ohm. The sample has an area of 10^(-6) cm2 and a length of 10 µm . The doping efficiency of the sample is (µn = 800 cm2/V-s ) |
| A. | 43.2% |
| B. | 78.1% |
| C. | 96.3% |
| D. | 54.3% |
| Answer» C. 96.3% | |
| 4. |
In germanium semiconductor at T 300 K, the acceptor concentrations is Na 1013 cm3 and donor concentration is Nd 0. The thermal equilibrium concentration p0 is |
| A. | 2.97 x 109 cm3 |
| B. | 2.68 x 1012 cm3 |
| C. | 2.95 x 1013 cm3 |
| D. | 2.4 cm3 |
| Answer» D. 2.4 cm3 | |
| 5. |
Two semiconductor material have exactly the same properties except that material A has a bandgap of 1.0eV and material B has a bandgap energy of 1.2 eV. The ratio of intrinsic concentration of material A to that ofmaterial B is |
| A. | 2016 |
| B. | 47.5 |
| C. | 58.23 |
| D. | 1048 |
| Answer» C. 58.23 | |
| 6. |
Use the temperature T= 300 K unless otherwise stated. In germanium semiconductor material at T 400 K the intrinsic concentration is (x 10^14 per cc) |
| A. | 26.8 |
| B. | 18.4 |
| C. | 26.8b) 18.4c) 8.5 |
| D. | 3.6View Answer |
| Answer» D. 3.6View Answer | |
| 7. |
A number A is said to be arithmetic mean between two numbers a and b if a,A,b is |
| A. | a sequence |
| B. | not a sequence |
| C. | G.P |
| D. | A.P |
| Answer» E. | |
| 8. |
for a set A and the universal set U, A ∪ Ac |
| A. | A |
| B. | Ac |
| C. | π |
| D. | U |
| Answer» E. | |
| 9. |
A number H is said to be the harmonic mean between two numbers a and b if a,H,b is |
| A. | H.P |
| B. | A.P |
| C. | G.P |
| D. | harmonic mean |
| Answer» B. A.P | |
| 10. |
The common ratio of a geometric sequence cannot be |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 0 |
| Answer» C. 2 | |
| 11. |
When is common thresher shark most active? |
| A. | Afternoon |
| B. | Morning |
| C. | Night |
| D. | Evening |
| Answer» D. Evening | |
| 12. |
The harmonic mean between the two numbers a and b is |
| A. | a+b/2ab |
| B. | a-b/2ab |
| C. | 2ab/(a+b) |
| D. | 2ab/a-b |
| Answer» D. 2ab/a-b | |
| 13. |
If A,G,H are the arithmetic, geometric means between a and b respectively, then |
| A. | H > G > A |
| B. | H≥ G > A |
| C. | H≥ G≥ A |
| D. | A > G > H |
| Answer» E. | |
| 14. |
Which was Shirley Temple’s first feature film? |
| A. | Heidi |
| B. | Curly Top |
| C. | Stand Up and Cheer |
| D. | Change of Heart |
| Answer» D. Change of Heart | |
| 15. |
The A.P whose nth term is 2n-1 is |
| A. | 1,3,6,… |
| B. | 2,3,5,… |
| C. | 1,3,5,… |
| D. | 5,3,1,… |
| Answer» D. 5,3,1,… | |
| 16. |
1+2+3+…+n = |
| A. | n(n + 1)/6 |
| B. | n(n + 1)/4 |
| C. | n(n + 1)/2 |
| D. | n(n + 1) |
| Answer» D. n(n + 1) | |
| 17. |
The sum of the first fifteen terms of the series 5+10+20+… is |
| A. | 341 |
| B. | 1023 |
| C. | 5115 |
| D. | 10230 |
| Answer» D. 10230 | |
| 18. |
5,5/2,5/4,… is |
| A. | an A.P |
| B. | a G.P |
| C. | a H.P |
| D. | None of the Above |
| Answer» C. a H.P | |
| 19. |
When was Shirley Temple ambassador to Czechoslovakia? |
| A. | 1989-1992 |
| B. | 1974-1976 |
| C. | 1976-1977 |
| D. | 1969-1970 |
| Answer» B. 1974-1976 | |
| 20. |
Rate of heat lost depends upon the |
| A. | amount of muscular tissue in the body |
| B. | amount of fatty issues in a body |
| C. | amount of heavy work done |
| D. | number of sweat glands under the skin |
| Answer» C. amount of heavy work done | |
| 21. |
A subset of A x A is called a |
| A. | relation from A to B |
| B. | Relation from B to A |
| C. | Relation in A |
| D. | relation in B |
| Answer» D. relation in B | |
| 22. |
The nth term of an A.P is 1/2(3-n), the first three terms are |
| A. | 3,2,1 |
| B. | 1,2,3 |
| C. | 1,2,1 |
| D. | 1,1/2,0 |
| Answer» E. | |
| 23. |
The general term of the sequence is denoted by |
| A. | na |
| B. | an |
| C. | Sn |
| D. | n |
| Answer» C. Sn | |
| 24. |
Which part of goblin shark is unusual? |
| A. | Tail fin |
| B. | Dorsal fin |
| C. | Snout |
| D. | Gill slit |
| Answer» D. Gill slit | |
| 25. |
The set of the Second element of ordered pair forming a relation is called its |
| A. | range |
| B. | domain |
| C. | Relation in A |
| D. | relation in B |
| Answer» C. Relation in A | |
| 26. |
A Subset of B x B is called a |
| A. | relation from A to B |
| B. | Relation from B to A |
| C. | Relation in A |
| D. | relation in B |
| Answer» E. | |
| 27. |
A sequence in which any term − its immediate previous term gives a constant is called |
| A. | geometric sequences |
| B. | arithmetic sequences |
| C. | harmonic sequences |
| D. | complex sequences |
| Answer» C. harmonic sequences | |
| 28. |
A sequence in which any term divided by its immediate previous term is called |
| A. | arithmetic mean |
| B. | geometric mean |
| C. | common ratio |
| D. | common difference |
| Answer» D. common difference | |
| 29. |
Which is the largest fish? |
| A. | Lemon shark |
| B. | Great white shark |
| C. | Whale shark |
| D. | Blue whale |
| Answer» D. Blue whale | |
| 30. |
p: 4 < 7, q: 6 > 11, the conjuntion pɅ q is |
| A. | False |
| B. | True |
| C. | not valid |
| D. | unknown |
| Answer» B. True | |
| 31. |
For any subset A and B of U, (A n B )c |
| A. | A n B |
| B. | A ∪ B |
| C. | π |
| D. | Ac n Bc |
| Answer» E. | |
| 32. |
The arithmetic mean between 2+√(2) and 2-√(2) is |
| A. | 2 |
| B. | √(2) |
| C. | 0 |
| D. | 4 |
| Answer» B. √(2) | |
| 33. |
Where was Shirley Temple born? |
| A. | Chicago |
| B. | Santa Monica |
| C. | Boston |
| D. | Albany |
| Answer» C. Boston | |
| 34. |
H1,H2,…,Hn are said to be n harmonic means between a and b if a,H1,H2…,Hn,b form |
| A. | H.P |
| B. | A.P |
| C. | G.P |
| D. | Harmonic series |
| Answer» B. A.P | |
| 35. |
If a = 3, r = 2, then the nth term of the G.P is |
| A. | 2.3n-1 |
| B. | 3.2n |
| C. | 3.2n+1 |
| D. | 3.2n-1 |
| Answer» E. | |
| 36. |
What is the average length of a spined pygmy shark? |
| A. | 14-15 inches |
| B. | 7-8 inches |
| C. | 16-17 inches |
| D. | 3-4 inches |
| Answer» C. 16-17 inches | |
| 37. |
What is the shape of hammerhead shark’s teeth? |
| A. | Triangular |
| B. | Conical |
| C. | Rectangular |
| D. | Circular |
| Answer» B. Conical | |
| 38. |
The common difference of the sequence 5,8,11,14,… is |
| A. | 3 |
| B. | −3 |
| C. | 0 |
| D. | 1 |
| Answer» B. −3 | |
| 39. |
Which is the class of sharks? |
| A. | Mammalia |
| B. | Amphibia |
| C. | Chondrichthyes |
| D. | Gastropoda |
| Answer» D. Gastropoda | |
| 40. |
Harmonic mean between x and y is |
| A. | x+y/2xy |
| B. | 2xy/x+y |
| C. | x+y/2xy |
| D. | None of the Above |
| Answer» C. x+y/2xy | |
| 41. |
A sequence of numbers whose reciprocals form an arithmetic sequence is called the |
| A. | arithmetic sequence |
| B. | geometric sequence |
| C. | harmonic sequence |
| D. | complex sequence |
| Answer» D. complex sequence | |
| 42. |
1/2,1/7,1/12,… is |
| A. | an arithmetic progression |
| B. | a Geometric Progression (GP) |
| C. | a harmonic progression |
| D. | a harmonic series |
| Answer» D. a harmonic series | |
| 43. |
If a,r and an are the first term, common ratio and the nth term respectively of the G.P then an = |
| A. | arn |
| B. | arn+1 |
| C. | arn-1 |
| D. | 0 |
| Answer» B. arn+1 | |
| 44. |
A conditional statemnt is regarded as false only antecedent is true and consequent is |
| A. | True |
| B. | False |
| C. | known |
| D. | unknown |
| Answer» C. known | |
| 45. |
The 7th term of an arithmetic sequence whose first term is 2 and common difference of zero is |
| A. | 14 |
| B. | 7 |
| C. | 2 |
| D. | 0 |
| Answer» D. 0 | |
| 46. |
The identity relation in A = {1,2,3,4,5,6} is |
| A. | {(1,1), (2,2),(3,3)} |
| B. | {(4,4),(5,5)(6,6)} |
| C. | {(1,1),(3,3)(4,4),(5,5)} |
| D. | {(1,1),(2,2),(3,3),(4,4),(5,5),(6,6) |
| Answer» E. | |
| 47. |
If an+2 + bn+2/an+1 + bn+1 is the geometric mean between a and b, then n = |
| A. | −1 |
| B. | 1 |
| C. | −2 |
| D. | −0.5 |
| Answer» E. | |
| 48. |
If an+3 + bn+3/an+2 + bn+2 is the arithmetic mean between a and b, then n = |
| A. | −1 |
| B. | 1 |
| C. | −2 |
| D. | 0 |
| Answer» D. 0 | |
| 49. |
What did Sigmund Freud found? |
| A. | Geometry |
| B. | Botany |
| C. | Archaeology |
| D. | Psychoanalysis |
| Answer» E. | |
| 50. |
When was Sigmund Freud appointed lecturer in neuropathology? |
| A. | 1879 |
| B. | 1873 |
| C. | 1885 |
| D. | 1882 |
| Answer» D. 1882 | |