Tìm phát biểu sai khi nói về sóng cơ.

Một chất điểm dao động điều hoà có phương trình li độ theo thời gian là: . Tại thời điểm thì li độ của chất điểm bằng

Điểm nào dưới đây thuộc đồ thị hàm số \(y=-{{x}^{3}}+3{{x}^{2}}-2\)?

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 41 to 45.

When parents name their children, they often take into consideration their own preferences, family traditions, or beliefs. In many European cultures, parents typically select names based on family connections, often honoring grandparents or ancestors. For instance, in Italy, children are commonly named after their grandparents, starting with the father's parents and then the mother's. Similarly, in Eastern Europe, children may be named after their deceased relatives to protect them from harm.

In some Asian countries, the naming process may involve the child's grandfather or a fortune-teller, who chooses a name believed to shape the child's character. Names might be inspired by elements like fire, water, earth, wood, or metal, or they may convey qualities such as beauty, strength, or kindness.

African cultures also have unique naming traditions, such as in Ghana's Akan culture, where a child's name is determined by the day of their birth. Each day has specific names for boys and girls, reflecting characteristics associated with that day. For example, a boy born on Friday might be named Kofi, symbolizing a "wanderer" or "explorer" while a girl born on the same day could be named Afua, also representing a traveler.

No matter where a name originates, it holds significant meaning and reflects the child's cultural heritage. Whether chosen out of preference or dictated by tradition, a child's name is a cherished and respected gift.

The word "dictated" in the passage is closest in meaning to________.

Which of the following best restates each of the given sentences?

It is believed that people with mental health conditions, all over the world, are seen to be good and efficient workers.

Sắp xếp các hydroxide H₂SiO₃, H₃PO₄, HClO₄ theo chiều tính acid giảm dần là

Speech is one of the most important ways of communicating. It consists of far more than just making noises. To talk and also (627) ___________ by other people, we have to speak a language, that is, we have to use combinations of sounds that everyone agrees to stand for a particular object or idea. Communication would be impossible (628) _________________. Learning a language properly is very important. The basic vocabulary of English is not very large, and not only about 2,000 words are needed to speak it quite well. But (629) ________________, the more precise you can be about their exact meaning. Words are the main thing we use in communicating what we want to say. (630) ________________. (631) _______________ of voice can express many emotions and show whether we are pleased or angry, for instance.

Câu 628:

Communication would be impossible (628) _________________.

Data privacy means ensuring that our personal information is kept safe and used responsibly by others. In today’s digital world, where information spreads easily, it’s more important than ever to protect our personal data. This highlights the importance of privacy laws.

Laws about data privacy vary globally. For example, in Europe, the General Data Protection Regulation (GDPR) grants individuals rights such as accessing their data, asking for it to be deleted, and knowing how it’s used. Similarly, the California Consumer Privacy Act (CCPA) provides specific rights about personal information to people in California. Knowing these laws helps people understand their rights and what companies must do to keep their data safe. When using websites or apps, it’s essential to read their privacy policies. Emily Davis, a cybersecurity expert, stresses, “Reading and understanding privacy policies allows individuals to make informed decisions about sharing their personal information.”.

To boost your online safety, experts suggest using strong, unique passwords for each account and not reusing them. Enabling two-factor authentication when possible adds an extra layer of security. Equally important, be careful with emails, texts, or calls asking for personal information or money. Scammers often pretend to be real organizations. Always check before giving out personal details or clicking on links from unknown sources. Keep your devices updated with the latest software and security patches to protect against cyber threats. Using trusted antivirus software can also lower the risk of attacks. Privacy advocate Michelle Carter advises, “Being mindful of data sharing and regularly reviewing app permissions helps minimize unnecessary exposure of personal information.”.

Understanding your rights and taking steps to protect your personal information online are essential in today’s interconnected world. By learning about privacy laws, being careful about sharing information, and using strong security measures, you can control your digital presence and keep your privacy safe. Remember, protecting personal data is something we all need to do together to create a safer and more respectful online environment.

Which of the following does the author probably support?

Phát biểu nào trong các phát biểu bên dưới là đúng?

Cho hàm số \(y=\frac{1}{3}{{x}^{3}}-\frac{1}{2}{{x}^{2}}-12x-1\). Mệnh đề nào sau đây đúng?

Đặt một điện tích thử - 2.10^-6 C tại một điểm, nó chịu một lực điện 2.10^-3 N có hướng từ trái sang phải. Cường độ điện trường có độ lớn và hướng là

Pha của dao động được dùng để xác định

Đọc đoạn trích sau và trả lời câu hỏi:

Thuở nhỏ tôi ra cống Na câu cá

níu váy bà đi chợ Bình Lâm

bắt chim sẻ ở vành tai tượng Phật

và đôi khi ăn trộm nhãn chùa Trần.

(Đò Lèn, Nguyễn Duy)

Xác định phương thức biểu đạt chính được sử dụng trong đoạn thơ trên.

Quốc gia nào có GDP bình quân đầu người thấp nhất trong các quốc gia sau đây?

Read the passage below and choose A, B, C or D.

Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

What is the word “potentially” in paragraph 4 closest in meaning to?

Điền vào chỗ trống câu sau đây sao cho đúng:

“……………….là ngành khoa học ra đời sớm nhất, gắn liền với nhu cầu sản xuất nông nghiệp”.

Trong hạt nhân

Tiếng sét và tia chớp được tạo ra gần như cùng một lúc, nhưng ta thường nhìn thấy chớp trước khi nghe thấy tiếng sét. Giải thích đúng là: 

Một người đạp xe với vận tốc 3,4 m/s thì đạp chậm dần rồi dừng lại sau 10 s. Gia tốc của xe có độ lớn là

Quả cầu nhỏ mang điện tích 10^-9 C đặt trong không khí. Cường độ điện trường tại 1 điểm cách quả cầu 5 cm là