
khánh
Quiz
•
Other
•
11th Grade
•
Practice Problem
•
Hard
Nguyễn Khánh
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20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
log(M.N) = ?
log M . log N
log M - log N
log M + log N
có à ????
Answer explanation
The logarithmic property states that log(M.N) = log M + log N. This means the logarithm of a product is equal to the sum of the logarithms of the factors, making 'log M + log N' the correct answer.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1 byte = ? bit
8
16
32
64
Answer explanation
1 byte is equal to 8 bits. This is a standard measurement in computing, where each bit represents a binary digit (0 or 1). Therefore, the correct answer is 8.
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
1, 2 dimethyl benzene còn được gọi là gì?
o dimethylbenzene
o xylene
toluene
napthalene
Answer explanation
1,2-dimethylbenzene is commonly known as o-xylene. It is a type of xylene, which refers to dimethylbenzene isomers. Thus, both 'o dimethylbenzene' and 'o xylene' are correct names for this compound.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
với dây 2 đầu cố định, số bụng k thì có bao nhiêu nút
k+1
k+2
k
k-1
Answer explanation
Với dây 2 đầu cố định, số bụng k tương ứng với k+1 nút. Mỗi bụng tạo ra một nút, và thêm một nút ở mỗi đầu dây, do đó tổng số nút là k+1.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Most parents _______ technology for their children’s distraction from schoolwork.
scold
disapprove
blame
pose
Answer explanation
Most parents blame technology for their children’s distraction from schoolwork, as it often diverts attention away from studies, making 'blame' the most fitting choice among the options.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
C2H2 + Ag(NH3)2OH tạo thành kết tủa màu gì
xanh
vàng
tím
đỏ
Answer explanation
Phản ứng giữa C2H2 và Ag(NH3)2OH tạo ra kết tủa màu vàng do sự hình thành của hợp chất bạc acetylide. Đây là đặc trưng của phản ứng này.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
trong giao thoa ánh sáng, i = ?
λD/a
aD/λ
λD/2a
2D/λa
Answer explanation
Trong giao thoa ánh sáng, công thức tính góc i được xác định bằng i = λD/a, trong đó λ là bước sóng, D là khoảng cách từ nguồn đến màn chắn, và a là khoảng cách giữa các khe. Do đó, lựa chọn đúng là λD/a.
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