Giữa hai điểm M,N mạch điện MN, hiệu điện thế không đổi có mắc một ampe kế nối tiếp với đoạn mạch song song gồm 2 điện trở R1=10Ω, R2=20Ω, ampe kế chỉ 1,5A

a/ Tính điện trở tương đương của đoạn mạch

b/ Tính cường độ dòng điện đi qua mỗi điện trở

c/ Tính công của dòng điện trong 2h (kWh)

d/ Thay R1 và R2 bằng một dây dẫn sao cho số chỉ của ampe kế vẫn như cũ. Tính R, biết rằng S=0.2mm^{2 và} P=0,4.10^-6Ωm

Ngày mai mình thi rồi, mong mọi người giúp mình câu hỏi này!

Hãy viết chương trình pascal tìm số n để tổng 1+2+3.....+n>100000

MỌI NGƯỜI GIÚP MÌNH VỚI Ạ TẠI MÌNH SẮP THI HK II RỒI!!!

Viết chương trình nhập 1 dãy N số nguyên từ bàn phím với N nhập từ bàn phím xuất ra dãy số in ra màn hình

a) tính trung bình cộng của dãy. Xuất ra màn hình

b) tìm giá trị lớn nhất, giá trị nhỏ nhất của dãy. Xuất ra màn hình

c) tìm hiệu giữa giá trị trung bình, giá trị lớn nhất, giá trị nhỏ nhất

MỌI NGƯỜI GIÚP MÌNH VỚI Ạ VÌ SẮP KIỂM TRA RỒI!

Em hãy viết 1 bài văn nói về đất nước Singapore.

Mọi người giúp mình bài này với ạ!

Cho mình gửi lời cảm ơn!

I. Read the following passage and choose the best option for each numbered blank.

Throughout its history, Japan (1)________from the destructive sea surges, known as tsunami. Tsunamis (2)________by earthquakes, hundreds of which strike Japan each year. It is of utmost importance that Japan is always ready for this chain of natural disasters. In Japan, high-rise buildings in major cities (3)________so that they (4)_______rather than shake during earthquakes, making them safer. Besides, new regualtions for quake-proofing buildings came into force, and some local governments (5)_____citizens a structural health check on their homes. Some coastal areas have tsunamis (6)_______, while others (7)________built floodgates to withstand inflows of water from tsunamis. And if an earthquake above a certain magnitude (8)_________, the bullet train will stop and nuclear and other plants will automatically go into temporary shut-down.

1. A.had suffered B. has suffered C. had been suffered D. has been suffered

2. A.trigger B. are triggered C. triggered D. were triggered

3. A.design B. are designed C. designed D. were designed

4. A.sway B. are swaying C. are swayed D. have swayed

5. A. offer B. are offering C. are offered D. offered

6. A.home B. house C. shelter D. habitat

7. A.build B. are building C. are built D. have built

8. A.strikes B. is striking C. has struck D. is struck

II. Read the paragraph and then complete it. Using the words in the box.(1.5 mark)

I disagree (1)___________ the idea that robots will only bring benefits to people in the future. Robots will also have some (2)_____________ influences. Firstly, they will be very expensive and we will spend too much money buying and fixing them. Secondly, robots in (3)___________will be able to do everything the workers do, so robots will make them jobless.(4)___________, robots in our homes will do all the housework (5)_____________ us, so we will become lazy and inactive. (6)____________ short, robots will do many things for us, but they may not improve the quality of our lives.

III. Read the following passage then answer the questions: (1.0 mark)

Alaska is perhaps the most amazing state in the USA. It has coaslines facing both the Arctic Ocean and the Pacific Ocean. This state has an incredible three million lakes. That’s four lakes per person living there. Many cities in Alaska cannot be reached by road, sea, or river. The only way to get it and out is by air, on foot, or by dogsled. That’s why Alaska has the busiest sea airport in the world, Lake Hood Seaplane Base. Nearly two hundred float planes take off and land on the water of this airport every day. It’s really a fun scene to watch.Alaska is called the Land of Midnight Sun because in summer, the sun does not set for nearly three months. But in winter the sun stays almost unseen. All Alaskans take place special pride in their beautiful and unique state.

Answer the questions:

1.Where is Alaska ?

………………………………………………………………………………………………

4. Why is Alaska called the Land of Midnight Sun ?

…………………………………………………………………………………………………..

IV. Read the following passages and then choose the best answer A, B, C or D to each question

Passage 1:

By adopting a few simple techniques, parents who read to their children can substantially increase their children’s language development. It’s surprising but true. How parents talk to their children makes a big difference in the children’s language development. If a parent encourages the child to actively respond to what the parent is reading, the child’s language skills increase.

A study was done with two- to three- year-old children and their parents. Half of the thirty children participated in the experimental study, the other half acted as the control group. In the experimental group, the parents were given a two-hour training session in which they were taught to ask open-ended questions rather than yes/no questions. For example, the parents should ask, “What is the doggie doing? “ rather than “Is the doggie running away?”. Experimental parents were also instructed in how to expand on their children’s answers, how to suggest alternative possibilities, and how to praise correct answers.

At the beginning of the study, the children did not differ on measures of language development, but at the end of one month, the children in the experimental group tested 5.5 months ahead of the control group on a test of verbal expression and vocabulary. Nine months later, the children in the experimental group still showed an advance of 6 months over the children in the control group.

1. Which of the following can be inferred from the passage?

A. Children who talk a lot are more intelligent.

B. Parents who listen to their children can teach them more.

C. Active children should read more.

D. Verbal ability can easily be increased.

2. What does the word “It ” refer to?

A. Parents increasing children’s language development.

B. Reading techniques being simple

C. Parents reading to children.

D. Children’s language development.

3. According to the author, which of the following questions is the best type to ask children about reading?

A. Do you see the elephant?

B. Is the elephant in the cage?

C. What animals do you like?

D. Shall we go to the zoo?

4. What was the difference between the control group and the experimental group?

A. The training parents received.

B. The age of the children.

C. The books that were read.

D. The number of children.

5. What conclusion is best supported by the passage?

A. Parents should be trained to read to their children.

B. The more children read, the more intelligent they become.

C. Children’s language skills increase when they are required to respond actively.

D. Children who read actively act six months older.

Passage 2: A combination of water, salt, air pollution, sun, sand and wind is destroying the huge statue just outside Cairo. This five-thousand-year-old statue, which has the body of a lion and the face of a human being, is too badly damaged to be completely saved. First, there is not a good drainage system around the statue and too much water has been running into the stone statue for several years. As a result, tiny pieces of salt have been left on the stone and have damaged it. Second, air pollution from the increasing amount of traffic in Cairo is also destroying the ancient statue. The air is so full of poisonous gases that it is damaging the statue even faster. Third, the statue is being destroyed by extremes of temperature. The air is very cold at night, but during the day the stone of the statue becomes very hot under the strong sunlight. Other natural forces such as severe sandstorms attack the statue as well. Finally, the tourists who visit the statue every day also cause a lot of damage to it.

1. Which of the following is NOT true about the statue?

A. Part of it looks like a person. B. It is in the centre of Cairo.

C. It is very big. D. It is badly damaged.

2. According to the passage, the statue was built ______

A. 500 years ago B. in the 10^th century

C. in the 5^th century D. 5,000 years ago

3. All of the following are mentioned as causes of damage to the statue EXCEPT

A. temperature B. fires

C. air pollution D. tourists

4. The word “ancient” in the passage mostly means ______

A. very old B. very big

C. modern D. beautiful

5. It can be inferred from the text that _____

A. tiny pieces of salt have been put on the statue to prevent damage

B. there is little damage to the statue.

C. the statue was built for entertainment many years ago.

D. human beings as well as nature cause much damage to the statue.

V. Choose the best answer A, B, C or D to fill in each gap in the following passage

Approximately 350 million people (1)____English as their first (2) __. About the same number use it (3) _____a second language. It is the language (4) ____aviation, international sport and world trade. 75% of the world’s (5) ______is in English, 60% of the world’s radio stations (6) ______in English, and more than half of the world’s newspapers are (7) ____ in English. It is an official language in 44 countries. In (8)______ others, it is the language of business, commerce and technology. There are many (9) ______of English but Scottish, Australian, Indian and Jamaican speakers of English would (10) _____that they are all speaking the same basic language in spite of the differences in pronunciation, structure and vocabulary.

1. A. say B. speak C. tell D. talk

2. A. language B. languages C. linguistics D. linguists

3. A. of B. with C. as D. in

4. A. on B. to C. from D. of

5. A. mail B. parcels C. envelopes D. letters

6. A. broadcast B. travel C. write D. show

7. A. spoken B. printed C. sold D. taken

8. A. an B. more C. many D. much

9. A. varieties B. kind C. type D. sort

10. A. use B. keep C. invent D. recognize

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