Phát biểu nào sau đây đúng?

Xét khối khí trong một xilanh đặt nằm ngang. Khi truyền nhiệt lượng X joule (J) cho khối khí, khối khí nở ra đẩy pit-tông dịch chuyển đều, làm thể tích khối khí tăng thêm 9 cm³ và nội năng của khối khí tăng thêm 0,4 J. Biết trong quá trình đó áp suất khối khí không đổi và bằng \(10^5\) Pa. Xác định giá trị X.

Phương trình hoá học nào sau đây không đúng?

Chọn ý đúng: Công dụng thứ tư của mạch điện tử điều khiển là gì?

Khi sử dụng Google Drive, bước đầu tiên để tải tập tin lên ổ đĩa trực tuyến là gì?

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 28 to 34. Foot-racing is a popular activity in the United States. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in strollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length. The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80,000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire-hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

Which of the following is NOT mentioned in this passage?

Thế kỉ XVI, XVII các nước Mỹ La-tinh là thuộc địa của thực dân nào sau đây?

Cho \(3\pi <\alpha <\frac{10\pi }{3}\), kết quả nào sau đây đúng?

Thể tích của khối tròn xoay tạo thành khi quay hình phẳng giới hạn bởi đồ thị hàm số $y=\sqrt{\tan x}$, trục hoành và các đường thẳng $x=0$, $x=\dfrac{\pi}{4}$ quanh trục hoành là

Cần thực hiện một joule công để di chuyển một coulomb điện tích từ điểm này sang điểm khác mà không thay đổi vận tốc. Câu nào sau đây là đúng giữa hai điểm?

Cho $A$, $B$ là hai biến cố xung khắc. Biết $P\left(A \right)=\dfrac{1}{3}$, $P\left(B \right)=\dfrac{1}{4}$. Khi đó $P\left(A\cup B \right)$ bằng

Đến giữa thế kỉ XIX, thể chế chính trị của Nhật là:

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.

The judges ______ an important role in the competition.

Bảng sau thống kê cân nặng của $30$ học sinh lớp $12A1$.

Khoảng biến thiên của mẫu số liệu ghép nhóm trên là

I washed the dishes yesterday, but I _____________ no time to do it today.

Chủ thể tiêu dùng có những vai trò nào sau đây?

Hình nào sau đây minh họa tập $A$ là con của tập $B$?

Thông thường sau khi sử dụng khăn lông để lau mắt kính ta thấy sẽ có một vài mảnh vụn của lông tơ còn bám lại trên kính, đó là hiện tượng nhiễm điện do

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).

The phrase "fear of missing out" in paragraph 2 could be best replaced by ____.