Một con lắc đơn dài 25 cm, hòn bi có nặng 10 g và mang điện tích q   =   10 - 4   C . Treo con lắc vào giữa hai bản kim loại thẳng đứng, song song, cách nhau 22 cm. Đặt vào hai bản hiệu điện thế một chiều 88 V. Lấy g = 10 m/s². Chu kì dao động nhỏ của nó là

A. T = 0,983 s

B. T = 0,389 s

C. T = 0,659 s

D. T = 0,957 s

Có ba nguồn điện hoàn toàn giống nhau ghép thành bộ. Nếu ghép chúng nối tiếp với nhau thì suất điện động của bộ bằng 9V. Nếu ghép hai nguồn song song với nhau rồi nối tiếp với nguồn còn lại thì suất điện động của bộ bằng:

A. 3V.

B. 6V

C. 4,5V

D. 5,5V

The difference between the nuclear family and the extended family is that a nuclear family refers to a single basic family unit of parents and their children, whereas the extended family refers to their relatives such as grandparents, in-laws, aunts and uncles, etc. In many cultures, and particularly indigenous societies, the latter is the most common basic form of social organization.

 A nuclear family is limited, according to Kristy Jackson of Colorado State University, to one or two parents (e.g. a father and mother) and their own child, or children, living together in a single house or other dwellings. In anthropology, they only must be related in this fashion; there is no upper or lower limit on the number of children in a nuclear family.

 The extended family is a much more nebulous term, but in essence refers to kin or relations not covered by the above definition. In historical Europe and Asia as well as in Middle Eastern, African, and South American Aboriginal cultures, extended family groups were typically the most basic unit of social organization. The term can differ in specific cultural settings, but generally includes people related in age or by lineage. Anthropologically, the term “extended family” refers to such a group living together in a household, often with three generations living together (grandparents, parents, and children) and headed in patriarchal societies by the eldest man or by some other chosen leadership figure. However, in common parlance, the term “extended family” is often used by people simply to refer to their cousins, aunts, uncles, and so on, even though they are not living together in a single group.

Historically, most people in the world have lived in extended family groupings rather than in nuclear families. This was even true in Europe and in the early United States, where multiple generations often lived together for economic reasons. During the 20^th century, average income rose high enough that living apart as nuclear families became a viable option for the vast majority of the American population. In contrast, many indigenous societies and residents of developing countries continue to have multiple generations living in the same household. The rise of the nuclear family in the modern West does not necessarily mean that family arrangements have stabilized, either. The rapid growth in single-parent households, for instance, also represents a substantial change in the traditional nuclear family. More couples are also choosing not to have children at all.

The word “the latter” in paragraph 1 refers to ______.

A. family unit       

B. relatives 

C. the nuclear family       

D. the extended family

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

At no time did the two sides look likely to reach an agreement.

A. The two sides had no time to reach an agreement.

B. The two sides never looked likely to reach an agreement.

C. The two sides would never like to reach an agreement.

D. If the two sides had had more time, they would have reached an agreement.

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

Reading to oneself is a modern activity which was almost unknown to the scholars of the classical and medieval worlds, while during the fifteenth century the term “reading” undoubtedly meant reading aloud. Only during the nineteenth century did silent reading become commonplace.

One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.

The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increased, the number of potential listeners declined and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers. Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some way mentally weakening. Indeed, this argument remains with us still in education. However, whateverits virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialised readership on the other.

By the end of the twentieth century, students were being recommended to adopt attitudes to books and to use reading skills which were inappropriate, if not impossible, for the oral reader. The social, cultural and technological changes in the century had greatly altered what the term “reading” implied.

Silent reading, especially in public places, flourished mainly because of ______.

A. the decreasing need to read aloud

B. the development of libraries

C. the increase in literacy

D. the decreasing number of listeners

Chia hỗn hợp gồm glucozơ và mantozơ thành 2 phẩn bằng nhau:

Phần 1: Hòa tan hoàn toàn vào nước rồi lấy dung dịch cho tác dụng với  AgNO 3 / NH 3  dư được 0,02 mol Ag.

Phần 2: Đun với dung dịch  H 2 SO 4  loãng. Hỗn hợp sau phản ứng được trung hòa bởi dung dịch NaOH, sau đó cho toàn bộ sản phẩm tác dụng với lượng dư dung dịch  AgNO 3 / NH 3  được 0,03 mol Ag.

Số mol của glucozơ và mantozơ ban đầu lần lượt là:

A. 0,01 và 0,01

B. 0,005 và 0,005

C. 0,0075 và 0,0025

D. 0,0035 và 0,0035

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 36 to 42

          Animals have an intuitive awareness of quantities. They know without analysis the difference between a number of objects and a smaller number. In his book “ The natural History of Selboure ” (1786 ) , the naturalist Gilbert White tells how he surreptitiously removed one egg a day from a plover‟s nest , and how the mother laid another egg each day to make up for the missing one . He noted that other species of birds ignore the absence of a single egg but abandon their nests if more than one egg has been removed. It has also been noted by naturalists that a certain type of wasp always provides five – never four, never six - caterpillars for each of their eggs so that their young have something to eat when the eggs hatch . Research has also shown that both mice and pigeons can be taught to distinguish between odd and even numbers of food pieces.
          These and similar accounts have led some people to infer that creatures other than humans can actually count. They also point to dogs that have been taught to respond to numerical questions with the correct number of barks, or to horses that seem to solve arithmetic problems by stomping their hooves the proper number of times.
          Animals respond to quantities only when they are connected to survival as a species – as in the case of the eggs – or survival as individuals - as in the case of food. There is no transfer to other situations or from concrete reality to the abstract notion of numbers. Animals can “count” only when the objects are present and only when the numbers involved are small – not more than seven or eight. In lab experiments, animals trained to “count” one kind of object were unable to count any other type. The objects, not the numbers, are what interest them. Animals admittedly remarkable achievements simply do not amount to evidence of counting, nor do they reveal more than innate instincts, refined by the genes of successive generations, or the results of clever, careful conditioning by trainers

Why does the author refer to Gilbert White‟s book in line 2?

A. To indicate that more research is needed in this field

B. To show how attitudes have changed since1786

C. To provide evidence that some birds are aware of quantities

D. To contradict the idea that animals can count

I am _______ at paying my bills on time

A. hopeful

B. hopeless

C. hope

D. hoping

Cho các phát biểu sau:

(a) Anđehit vừa có tính oxi hóa vừa có tính khử.

(b) Phenol không tham gia phản ứng thế.

(c) Nitro benzen phản ứng với HNO₃ đặc (xúc tác H₂SO₄ đặc) tạo thành m-đinitrobenzen.

(d) Dung dịch lòng trắng trứng tác dụng được với Cu(OH)₂ cho dung dịch phức có màu xanh tím.

(e) Nguyên liệu để điều chế CH₃CHO bằng phương pháp hiện đại để là C₂H₂.

Có bao nhiêu phát biểu đúng?

A. 2

B. 3

C. 5

D. 4