Kiểm tra: 1 tiết Lớp: 7 Môn: Vật lí

Họ và tên: Kiểm tra: 1 tiết Lớp: 7 Môn: Vật lí Điểm Lời phê của giáo viên Đề: 1 Câu 1: Có mấy loại điện tích? Cho biết sự tương tác của nó? Câu 2: Hai thước nhựa giống nhau, cùng cọ xát vào mảnh len. Hãy cho biết nếu đặt 2 thước nhựa lại gần nhau thì có hiện tượng gì xảy ra? Vì sao? Câu 3: Tác dụng nhiệt của dòng điện có ích đối với đồ dùng điện nào và có hại với dụng cụ điện nào? ( kể ít nhất 3 đồ dùng điện trong mỗi trường hợp ) Câu 4: Vẽ sơ đồ mạch điện gồm nguồn điện 2 pin mắc nối tiếp, khoá K đóng, bóng đèn và dây dẫn. Đánh dấu mũi tên chỉ chiều dòng điện. Câu 5: Tại sao kim loại là chất dẫn điện? 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Họ và tên: Kiểm tra: 1 tiết Lớp: 7 Môn: Vật lí Điểm Lời phê của giáo viên Đề: 2 Câu 1: Nguyên tử gồm những hạt nào? Khi nào thì một vật nhiễm điện âm, nhiễm điện dương? Câu 2: Thanh thuỷ tinh cọ xát vào mảnh lụa, thanh thuỷ tinh nhiễm điện dương. Mảnh lụa nhiễm điện gì? Vì sao? Câu 3: Chất dẫn điện và chất cách điện khác nhau ở chỗ nào? Những chất sau đây chất nào là chất dẫn điện, chất cách điện: ruột viết chì, dung dịch muối đồng, nhôm, đoạn dây đồng, không khí, cao su? Câu 4: Vẽ sơ đồ mạch điện gồm nguồn điện 2 pin mắc nối tiếp, khoá K đóng, bóng đèn và dây dẫn. Đánh dấu mũi tên chỉ chiều dòng điện. Câu 5: Tại sao trong mạch điện gia đình cần có cầu chì? 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