Câu 1: Máy cơ đơn giản nào sau đây không thể làm thay đổi đồng thời cả độ lớn và hướng của lực? A. Ròng rọc cố định B. Ròng rọc động C. Mặt phẳng nghiêng D. Đòn bẩy Câu 2: Trong các cách sắp xếp các chất nở vì nhiệt từ nhiều tới ít sau đây, cách sắp xếp nào là đúng? A. Rắn, lỏng, khí B. Rắn, khí, lỏng C. Khí, lỏng rắn D. Khí, rắn, lỏng Câu 3: Hiện tượng nào sau đây sẽ xảy ra khi đun nóng một lượng chất lỏng? A. Khối lượng của chất lỏng tăng B. Trọng lượng của chất lỏng tăng. C. Thể tích của chất lỏng tăng D. Cả khối lượng trọng lượng và thể tích đều tăng Câu 4: Trường hợp nào dưới đây, không xảy ra sự nóng chảy? A. Bỏ một cục nước đá vào nước B. Đốt một ngọn nến C. Đốt một ngọn đèn dầu D. Đúc một cái chuông đồng

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