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• Silic pha tạp asen thì nó là bán dẫn :  

Câu 1:

Silic pha tạp asen thì nó là bán dẫn :  

A.

A : Hạt tải cơ bản là eletron và là bán dẫn loại n.

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Phân tích: Asen nhóm 5 pha với Silic sẽ dư eletron trong liên kết, hạt tải điện cơ bản là electron và là bán dẫn loại n  

 

CHỌN A

B.

B : Hạt tải cơ bản là eletron và là bán dẫn loại p.

C.

C : Hạt tải cơ bản là lỗ trống và là bán dẫn loại n.

D.

D : Hạt tải cơ bản là lỗ trống và là bán dẫn loại p.

Những câu hỏi này đến từ bài kiểm tra này. Bạn có muốn thực hiện bài kiểm tra thử không?

Bài tập trắc nghiệm 15 phút Dòng điện trong chất bán dẫn - Dòng điện trong các môi trường - Vật Lý 11 - Đề số 1

• 15 phút
• 9 câu hỏi

Làm bài kiểm tra

Một số câu hỏi từ cùng một bài kiểm tra

• Trong đi ốt bán dẫn có

• Tranzito n – p – n có tác dụng:

• Silic pha tạp asen thì nó là bán dẫn :  

• Lỗ trống là:

• .Tranzito n – p – n có tác dụng:

• Nhận định nào sau đây không đúng về điện trở của chất bán dẫn ? 

• Silic pha pha tạp với chất nào sau đây không cho bán dẫn loại p?

• Tranzito có cấu tạo:   

• Trong đi ốt bán dẫn có:

Một số câu hỏi khác bạn có thể quan tâm

• Dưới tác dụng của một lực có dạng  vật có khối lượng m = 200g dao động điều hòa. Hỏi tốc độ cực đại của vật ?

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 50:

  Until recently, most American entrepreneurs were men. Discrimination against women in business, the demands of caring for families, and lack of business training had kept the number of women entrepreneurs small. Now, however, businesses owned by women account for more than $40 billion in annual revenues, and this figure is likely to continue rising throughout the 1990s. As Carolyn Doppelt Gray, an official of the Small Business Administration, has noted, "The 1970s was the decade of women entering management, and the 1980s turned out to be the decade of the woman entrepreneur". What are some of the factors behind this trend? For one thing, as more women earn advanced degrees in business and enter the corporateworld, they are finding obstacles. Women are still excluded from most executive suites. Charlotte Taylor, a management consultant, had noted, "In the 1970s women believed if they got an MBA and worked hard they could become chairman of the board. Now they've found out that isn't going to happen, so they go out on their own". In the past, most women entrepreneurs worked in "women's" fields: cosmetics and clothing, for example. But this is changing. Consider ASK Computer Systems, a $22-million-a-year computer software business. It was founded in 1973 by Sandra Kurtzig, who was then a housewife with degrees in math and engineering. When Kurtzig founded the business, her first product was software that let weekly newspapers keep tabs on their newspaper carriers and her office was a bedroom at home, with a shoebox under the bed to hold the company's cash. After she succeeded with the newspaper software system, she hired several bright computer-science graduates to develop additional programs. When these were marketed and sold, ASK began to grow. It now has 200 employees, and Sandra Kurtzig owns $66.9 million of stock. Of course, many women who start their own businesses fail, just as men often do. They still face hurdles in the business world, especially problems in raising money; the banking and finance world is still dominated by men, and old attitudes die hard. Most businesses owned by women are still quite small. But the situation is changing; there are likely to be many more Sandra Kurtzigs in the years ahead.  

  Question 46: The author mentions the “shoesbox under the bed” in the passage in order to __________.         

• Khi xảy ra cộng hưởng cơ thì vật tiếp tục dao động:        

• Read the following andmark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 22 to 29:

   Harvard University, today recognized as part of the top echelon of the world's universities, came from very inauspicious and humble beginning.

   This oldest of American universities was founded in 1636, just sixteen years after the Pilgrims landed at Plymouth. Included in the Puritan emigrants to the Massachusetts colony during this period were more than 100 graduates of England's prestigious Oxford and Cambridge universities, and these universities graduates in the New Word were determined that their sons would have the same educational opportunities that they themselves had had. Because of this support in the colony for an institution of higher learning, the General Court of Massachusetts appropriated 400 pounds for a college in October of 1636 and early the following year decided on a parcel of land for the school; this land was in an area called Newetowne, which was later renamed Cambridge after its English cousin and is the site of the present-day university.

   When a young minister named John Harvard, who came from the neighboring town of Charlestowne, died from tuberculosis in 1638, he willed half of his estate of 1,700 pounds to the fledgling college. In spite of the fact that only half of the bequest was actually paid, the General Court named the college after the minister in appreciation for what he had done. The amount of the bequest may not have been large, particularly by today's standard, but it was more than the General Court had found it necessary to appropriate in order to open the college.

   Henry Dunster was appointed the first president of Harvard in 1640, and it should be noted that in addition to serving as president, he was also the entire faculty, with an entering freshmen class of four students. Although the staff did expand somewhat, for the first century of its existence the entire teaching staff consisted of the president and three or four tutors.

  Question: The passage implies that __________________ .         

• Một con lắc lò xo gồm vật có khối lượng 500 (g) gắn với lò xo nhẹ có độ cứng 50 (N/m). Trong cùng một môi trường, người ta lần lượt cưỡng bức con lắc dao động bằng các ngoại lực (N), (N), (N), (N). Ngoại lực làm con lắc dao động với biên độ lớn nhất là:                         

• Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 41 to 50:

  Until recently, most American entrepreneurs were men. Discrimination against women in business, the demands of caring for families, and lack of business training had kept the number of women entrepreneurs small. Now, however, businesses owned by women account for more than $40 billion in annual revenues, and this figure is likely to continue rising throughout the 1990s. As Carolyn Doppelt Gray, an official of the Small Business Administration, has noted, "The 1970s was the decade of women entering management, and the 1980s turned out to be the decade of the woman entrepreneur". What are some of the factors behind this trend? For one thing, as more women earn advanced degrees in business and enter the corporateworld, they are finding obstacles. Women are still excluded from most executive suites. Charlotte Taylor, a management consultant, had noted, "In the 1970s women believed if they got an MBA and worked hard they could become chairman of the board. Now they've found out that isn't going to happen, so they go out on their own". In the past, most women entrepreneurs worked in "women's" fields: cosmetics and clothing, for example. But this is changing. Consider ASK Computer Systems, a $22-million-a-year computer software business. It was founded in 1973 by Sandra Kurtzig, who was then a housewife with degrees in math and engineering. When Kurtzig founded the business, her first product was software that let weekly newspapers keep tabs on their newspaper carriers and her office was a bedroom at home, with a shoebox under the bed to hold the company's cash. After she succeeded with the newspaper software system, she hired several bright computer-science graduates to develop additional programs. When these were marketed and sold, ASK began to grow. It now has 200 employees, and Sandra Kurtzig owns $66.9 million of stock. Of course, many women who start their own businesses fail, just as men often do. They still face hurdles in the business world, especially problems in raising money; the banking and finance world is still dominated by men, and old attitudes die hard. Most businesses owned by women are still quite small. But the situation is changing; there are likely to be many more Sandra Kurtzigs in the years ahead.  

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