Nhận xét nào sau đây không đúng khi nói về sóng cơ học?

Chuẩn bị sáu ống nghiệm và đánh số thứ tự từ 1 đến 6. Tiến hành thí nghiệm theo các bước sau:

Bước 1: Lấy 1 mL dịch chiết khoai tây cho vào ống nghiệm số 1 và 2.

Bước 2: Lấy 1 mL hồ tinh bột cho vào ống nghiệm số 3 và 4.

Bước 3: Nhỏ 1 - 2 giọt thuốc thử Lugol vào ống nghiệm số 1 và 3, nhỏ 1 mL thuốc thử Benedict vào ống nghiệm số 2 và 4.

Bước 4: Đun sôi 5 mL tinh bột với 1 mL HCl trong vài phút, để nguội rồi trung hòa bằng NaOH (thử bằng giấy quỳ).

Bước 5: Lấy lần lượt 1 mL dịch ở bước 4 cho vào ống nghiệm số 5 và 6, nhỏ 1 - 2 giọt thuốc thử Lugol vào ống số 5, nhỏ 1 mL thuốc thử Benedict vào ống số 6.

Read the following passage about human life expectancy 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 23 to 30.

In the UK, comprising England, Scotland, Wales, and Northern Ireland, jokes and tricks can be played until noon on 1 April. After midday it's considered bad luck to play a trick. Anyone who forgets this and tries a joke in the afternoon becomes an 'April Fool' themselves.

So, what kind of jokes do people play? Well, a simple example would be telling your friend that their shoelaces are undone. Then, when they bend down to do them up, you shout, 'April Fool!', and they realise their shoelaces are fine.

Maybe it's not your kind of humour, but watch out, there's always someone who will find it funny! In Ireland, a popular prank is to send someone on a 'fool's errand'. The victim is sent to deliver a letter, supposedly asking for help. When the person receives the letter, they open it, read it and tell the poor messenger that they will have to take the letter to another person. This continues and the victim ends up taking the message to several different people until someone feels sorry for them and shows them what the letter says: 'Send the fool to someone else.'

In France, Belgium, the Netherlands (or Holland), Italy and French-speaking areas of Canada and Switzerland, the 1 April tradition is known as the “April Fish”. A common joke is to try to stick a paper fish onto a victim's back without being noticed.

Which of the following is TRUE according to paragraph 4.

Sự kiện nào đánh dấu thực dân Pháp hoàn thành cơ bản cuộc xâm lược Việt Nam? 

Kết quả của đoạn chương trình sau?

s = 0

for i in range(1, 10):

s = s + i

print(s)

Chuyển động có đặc điểm nào sau đây là chuyển động chậm dần?

Đất trồng có nhóm tính chất nào sau đây?

Thể chế chính quyền thời Lê - Trịnh thường gọi là gì?

Cho phân tử HCl, biết cặp electron liên kết bị lệch về phía nguyên tử Cl. Khẳng định nào sau đây đúng khi nói về độ âm điện của H và Cl?

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions: It is (A) recommended that (B) people (C) to take regular (D) exercise.

The driver was ________.

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

Read the following passage about The Key to a Fulfilling Life and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

In today's fast-paced world, the importance of maintaining a healthy lifestyle cannot be overstated. (18)_________. For instance, those who engage in physical activities regularly often experience increased energy levels and improved mental well-being. 

Moreover, research shows that (19)_________. Healthy habits, such as drinking plenty of water and getting enough sleep, contribute significantly to overall wellness. 

(20)_________. It is essential to find activities that you genuinely enjoy, as this will make it easier to stay committed.

For example, many people find that yoga helps them manage stress while improving their flexibility. (21)_________. (22)_________.

In conclusion, making small changes to your daily routine can lead to significant improvements in your health and happiness. Embracing a healthy lifestyle is not just a trend; it’s a lifelong commitment to yourself.

Nghệ thuật kháng chiến đặc sắc của nhà Trần là gì?

Read the following passage about the impact of social media on mental health 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.

          [I] In recent years, social media platforms have become a central part of daily life, offering users countless ways to connect, share, and communicate. [II] While these platforms offer many advantages, experts have noted rising concerns about their effects on mental health, particularly among young people (Smith & Anderson, 2018). [III] Studies reveal that excessive social media use can contribute to feelings of anxiety, depression, and loneliness, despite its intention to promote connection and social interaction (Twenge & Campbell, 2019). [IV]

          A primary reason for these mental health concerns is the tendency for social media users to compare themselves to others. Platforms like Instagram and Facebook often highlight idealized lifestyles, leading users to feel inadequate about their own lives. Additionally, the constant notifications and messages contribute to a "fear of missing out," or FOMO, which keeps individuals in a cycle of checking their phones, often reducing the quality of sleep and overall well-being.

          There is also a growing body of research suggesting a link between social media use and decreased attention spans. When users frequently switch between apps and notifications, their ability to focus for extended periods may diminish (Rosen, 2019). This shift in attention can interfere with productivity, especially in academic and professional settings, where sustained focus is essential.

          Addressing these challenges requires a multi-faceted approach. Some mental health professionals suggest limiting screen time and setting boundaries, such as "device-free" hours before bedtime. Others recommend engaging in offline activities, like reading or exercising, to reduce dependence on social media and build healthier habits. According to psychologists, such strategies can enhance mental resilience and allow for more meaningful, balanced relationships (Robinson & Smith, 2020).

Which of the following best summarizes the passage?

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

DISCOVER THE FUTURE OF LEARNING WITH SMARTLEARN!

Are you ready to learn in a fun and easy way? Try SmartLearn – the app that makes studying (1)________ for everyone! SmartLearn helps students of all ages learn (2)________ and improve their grades. With SmartLearn, you can study anytime, anywhere! The app offers interactive lessons in many subjects like math,  science, English, and history. You can play games, watch videos, and take quizzes to remember what you learn. The lessons (3)________ by teachers are simple and enjoyable. Plus, SmartLearn is safe and family-friendly, so parents can trust it! Download the app today on your phone or tablet (4)________ free. You can try basic lessons or (5)_______ premium access for more features, like personalized study plans and expert tips. Start (6)________ with SmartLearn and see the difference. Don’t wait – get smarter today!

Những người sản xuất cung cấp hàng hoá, dịch vụ ra thị trường, đáp ứng nhu cầu tiêu dùng của xã hội là

It is important that family members talk and listen to one another.

Hãy xác định nguyên nhân dẫn đến lạm phát trong trường hợp dưới đây:

"Gia đình anh A là hộ chăn nuôi lợn thịt, trước đây, việc nuôi lợn thịt mang lại thu nhập ổn định. Tuy nhiên, trong vài năm trở lại đây, do giá thức ăn chăn nuôi tăng liên tục nên gia đình anh A đang đối mặt với thua lỗ".

Nguyên nhân nào sau đây dẫn đến thắng lợi của Cách mạng tháng Tám năm 1945 ở Việt Nam?

Gà bị liệt cánh sau khi mắc bệnh gà ru bao lâu?