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 following questions. In the history of technology, computers and calculators were innovative developments. They are essentially different from all other machines because they have a memory. This memory stores instructions and information. In a calculator, the instructions are the various functions of arithmetic, which are permanently remembered by the machine and cannot ...
Nguyễn Thu Hiền | Chat Online | |
01/09 12:29:49 (Tiếng Anh - Lớp 12) |
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 following questions.
In the history of technology, computers and calculators were innovative developments. They are essentially different from all other machines because they have a memory. This memory stores instructions and information. In a calculator, the instructions are the various functions of arithmetic, which are permanently remembered by the machine and cannot be altered or added to. The information consists of the numbers which are keyed in.
An electronic pocket calculator can perform almost instant arithmetic. A calculator requires an input unit to feed in numbers, a processing unit to make the calculation, a memory unit, and an output unit to display the result. The calculator is powered by a small battery or by a panel of solar cells. Inside is a microchip that contains the memory and processing units and also controls the input unit, which is the keyboard, and the output unit, which is the display.
The input unit has keys for numbers and operations. Beneath the key is a printed circuit board containing a set of contacts for each key. Pressing a key closes the contacts and sends a signal along a pair of lines in the circuit board to the processing unit, in which the binary code for that key is stored in the memory. The processing unit also sends the code to the display. Each key is connected by a different pair of lines to the processing unit, which repeatedly checks the lines to find out when a pair is linked by a key.
The memory unit stores the arithmetic instructions for the processing unit and holds the temporary results that occur during calculation. Storage cells in the memory unit hold the binary codes for the keys that have been pressed. The number codes, together with the operation code for the plus key, are held in temporary cells until the processing unit requires them.
When the equals key is pressed, it sends a signal to the processing unit. This takes the operation code - for example, addition - and the two numbers being held in the memory unit and performs the operation on the two numbers. After the addition is done, the result goes to the decoder in the calculator's microchip. This code is then sent to the liquid crystal display unit, which shows the result, or output, of the calculation.
In what part of the calculator are the processing and memory units?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. The output unit 0 % | 0 phiếu |
B. The solar cells 0 % | 0 phiếu |
C. The battery 0 % | 0 phiếu |
D. The microchip 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
Trắc nghiệm liên quan
- 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 following questions. In the history of technology, computers and calculators were innovative developments. They are ... (Tiếng Anh - Lớp 12)
- 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 following questions. In the history of technology, computers and calculators were innovative developments. They are ... (Tiếng Anh - Lớp 12)
- 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 following questions. In the history of technology, computers and calculators were innovative developments. They are ... (Tiếng Anh - Lớp 12)
- 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 following questions. People appear to be born to compute. The numerical skills of children develop so early and so ... (Tiếng Anh - Lớp 12)
- 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 following questions. People appear to be born to compute. The numerical skills of children develop so early and so ... (Tiếng Anh - Lớp 12)
- 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 following questions. People appear to be born to compute. The numerical skills of children develop so early and so ... (Tiếng Anh - Lớp 12)
- 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 following questions. People appear to be born to compute. The numerical skills of children develop so early and so ... (Tiếng Anh - Lớp 12)
- 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 following questions. People appear to be born to compute. The numerical skills of children develop so early and so ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word that best fits each of the numbered blanks. Seeking a new life and hoping a significant (28) ___________ in their standard of living, ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word that best fits each of the numbered blanks. Seeking a new life and hoping a significant (28) ___________ in their standard of living, ... (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Calcium hydroxide là chất rắn màu trắng, ít tan trong nước. Phát biểu nào sau đây sai? (Khoa học tự nhiên - Lớp 9)
- Ứng dụng của silicon là (Khoa học tự nhiên - Lớp 9)
- Từ cát thạch anh (cát trắng) sản xuất ra (Khoa học tự nhiên - Lớp 9)
- Công đoạn chính để sản xuất đồ gốm theo thứ tự lần lượt là (Khoa học tự nhiên - Lớp 9)
- Phát biểu nào sau đây không đúng về silicon? (Khoa học tự nhiên - Lớp 9)
- Vì sao vôi tôi được sử dụng để xử lí SO2 trong khí thải? (Khoa học tự nhiên - Lớp 9)
- Nhỏ một vài giọt hydrochloric acid lên một viên đá vôi thu được hiện tượng nào sau đây? (Khoa học tự nhiên - Lớp 9)
- Để sản xuất thủy tinh loại thông thường, cần các nguyên liệu nào sau? (Khoa học tự nhiên - Lớp 9)
- Vôi tôi là tên gọi của hợp chất nào sau đây? (Khoa học tự nhiên - Lớp 9)
- Quặng nào sau đây không có thành phần chủ yếu là oxide của kim loại? (Khoa học tự nhiên - Lớp 9)