PHẦN III. Câu trắc nghiệm trả lời ngắn

Trên dây đàn hồi AB dài 100 cm, với đầu B cố định. Tại đầu A gắn với một vật dao động với tần số ƒ = 40 Hz. Tốc độ truyền sóng trên dây là v = 20 m/s. Trên dây có bao nhiêu nút sóng?

Đáp án:

Hàng năm, anh A luôn chủ động đến cơ quan thuế để kê khai và nộp thuế đầy đủ theo đúng thời hạn quy định. Trong trường hợp này, anh A đã thực hiện hình thức nào của pháp luật?

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.

He can shout even louder, but I won’t take any notice.

Thiết bị nào thực hiện bay quanh Trái Đất và phát tín hiệu có thông tin xuống Trái Đất?

Đâu là ý nghĩa tích cực của tự do hóa thương mại mở rộng?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

Biting into a ripe, juicy fruit brings a smile to many people’s faces. But eating that same fruit a week before it is ripe probably wouldn’t be as enjoyable! Unripe fruits are often hard and bitter, but that serves a purpose. The hard exterior of an unripe fruit protects the developing seed inside. After a seed fully develops inside the fruit, the fruit changes color, softens, and gets sweeter to become more attractive to animals and humans. These organisms eat the fruit and spread its seeds, ensuring the plant’s survival and regrowth.

But how does a fruit ripen? The ripening process involves many complex chemical reactions. When a fruit ripens, it goes through a chemical change. A chemical change happens when bonds within molecules break, and the atoms that once formed them regroup into new molecules. Chemical changes are irreversible. Once a fruit ripens, it cannot become unripe again.

One molecule responsible for this chemical change is ethylene. Ethylene (C2H4) is a colorless gas made up of carbon and hydrogen atoms. (I). It is a naturally occurring molecule in the atmosphere. (II). It is also an important plant hormone. (III). Plants release ethylene through the growing tips of roots, flowers, and ripening fruit. (IV). Although ethylene serves other purposes in plants, one of its main purposes is to trigger the chemical reactions that cause fruits to ripen. As the fruit matures, oxygen in the air helps stimulate the production of ethylene. This ethylene production is a signal that begins fruit ripening. For that reason, unripe fruits have low levels of ethylene, while ripe fruits have higher levels of ethylene. Most fruits produce ethylene and respond to ethylene in the atmosphere.

Although fruits require ethylene to ripen, different types of fruits respond to this molecule in two distinct ways: non-climacteric fruits and climacteric fruits. Non-climacteric fruits do not ripen after harvesting. They produce very little ethylene of their own. Climacteric fruits, on the other hand, continue to ripen after they are picked. These fruits produce a large amount of ethylene. Climacteric fruits can also speed up the ripening process of other fruits nearby since they release high levels of ethylene into the air.  

Which of the following best summarizes the main point of the passage?

Read the following advertisement/announcement and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 1 to 6.

DISCOVER THE IPHONE 16

Looking for a smartphone that redefines innovation? The iPhone 16 is the perfect blend (1) ______
cutting-edge technology and sleek design. With its stunning Super Retina XDR display, you’ll experience vibrant colors and incredible detail. Whether you’re capturing photos or streaming videos, this device offers unparalleled performance. Want to enhance your (2) ______? The iPhone 16 features the powerful A16 Bionic chip, (3) ______ lightning-fast speeds for all your tasks. Plus, with its (4) ______, you can stay connected longer without worrying about (5) ______. With the introduction of Apple Intelligence and new AI-driven audio and visual features, Apple has once again pushed the boundaries of what a smartphone can do. Many of the predictions about the iPhone 16 were right on target, and the launch has received an enthusiastic response from the public. Apple has certainly raised the bar and has (6) ______ a new standard for the future of smartphones.

Ngày luôn luôn dài bằng đêm tại

Có mấy phương pháp ủ phân?

Loại khoáng sản nào mang lại giá trị kinh tế cao mà chúng ta đang khai thác ở các vùng của Biển Đông?

Việc phân chia thị trường thành các loại hàng hoá và dịch vụ như: thị trường lúa gạo, thị trường dầu mỏ, thị trường tiền tệ dựa trên cơ sở

Hệ thống điện quốc gia gồm:

Choose the word whose stress pattern is different from that of the others.

Một hộp hình lập phương có cạnh 10 cm chứa khí lí tưởng đơn nguyên tử ở nhiệt độ 20 °C và áp suất 1,2.10⁶ Pa. Cho số Avogadro N_A = 6,02.10²³ mol^-1. Số phân tử khí chuyển động đập vào một mặt hộp là