Câu 1 : Cho hình chóp tứ giác đều có thể tích V = \(\frac{a^3\sqrt{6}}{6}\) và độ dài cạnh đáy bằng a , tính độ dài l của cạnh bên
A. l = 2a B. l = \(\sqrt{2}a\) C. l = a D. l = \(a\sqrt{3}\)
Câu 2 : Cho khối chóp S.ABC có SA = SB = SC = 2a , đáy ABC là tam giác vuông tại A , AB = a . Gọi V là thể tích của khối chóp S.ABC . Tìm giá trị lớn nhất của V
A. V = \(\frac{5}{8}a^3\) B. V = \(\frac{5}{4}a^3\) C. V = \(\frac{2}{3}a^3\) D. V = \(\frac{4}{3}a^3\)
Câu 1 : Tính thể tích V của khối chóp S.ABC biết tam giác ABC vuông tại B , \(SA\perp\left(ABC\right)\) và SA = AB = a , BC = 2a
A. V = \(a^3\) B. V = 2a3 C. V = \(\frac{1}{3}a^3\) D. V = \(\frac{2}{3}a^3\)
Câu 2 : Tính thể tích V của khối chóp tam giác đều S.ABC biết cạnh đáy bằng a , cạnh bên \(SA\perp\left(ABC\right)\) và SA = \(2a\sqrt{3}\)
A. V = \(\frac{1}{2}a^3\) B. V = \(\frac{3}{2}a^3\) C. V = \(\frac{1}{3}a^3\) D. V = \(\frac{2}{3}a^3\)
Câu 3 : Tính thể tích V của khối chóp S.ABCD có đáy ABCD là hình vuông , BD = 2a , cạnh bên \(SA\perp\left(ABC\right)\) và SA = SC
A. V = 4a3 B. V = \(\frac{1}{3}a^3\sqrt{2}\) C. V = \(a^3\sqrt{2}\) D. V = \(\frac{4}{3}a^3\)
Câu 4 : Tính thể tích V của khối chóp S.ABCD là hình chữ nhật , AB = a , AD = \(a\sqrt{3}\) , \(SA\perp\left(ABC\right)\) và SC tạo với mặt phẳng đáy một góc 600
A. V = \(\frac{2}{3}a^3\) B. V = \(\frac{1}{3}a^3\sqrt{2}\) C. V = 6a3 D. V = 2a3
Câu 1 : Cho a mol este X ( C9H10O2 ) tác dụng vừa đủ với 2a mol NaOH , thu được dung dịch không có phản ứng tráng bạc . Số công thức cấu tạo phù hợp của X là :
A. 2 B. 3 C. 4 D. 6
Câu 2 : Cho các este sau : etyl fomat (1) ; vinyl axetat (2) ; triolein (3) ; metyl acrylat (4) ; phenyl axetat (5) . Dãy gồm các este đều phản ứng được với dung dịch NaOH dư , đun nóng sinh ra ancol là :
A. (1) , (2) , (3) B. (2) , (3) , (5) C. (1) , (3) , (4) D. (3) , (4) , (5)
Câu 1 : Thể tích HNO3 67,5 % (d = 1,5 g/ml ) cần dùng để tác dụng với xenlulozo tạo thành 89,1 kg xenlulozo trinitrat là ( H = 20% )
A. 70 lít B. 49 lít C. 81 lít D. 55 lít
Câu 2 : Từ 16,2 tấn xenlulozo người ta sản xuất được m tấn xenlulozo trinitrat ( biết hiệu suất phản ứng tính theo xenlulozo là 90% ) . giá trị của m là
A. 26,73 B. 33,00 C. 25,46 D. 29,70
Câu 1 : Khối lượng phân tử trung bình của xenlulozo trong sợi bông là 4.860.000 (u) . Vậy số mắt xích của glucozo có trong xenlulozo nói trên là :
A. 250.000 B. 270.000 C. 300.000 D. 350.000
Câu 2 : Biết khối lượng phân tử trung bình của PVC và xenlulozo lần lượt là 250000 và 1620000 . Hệ số polime hóa của chúng lần lượt là :
A. 6200 và 4000 B. 4000 và 2000 C. 400 và 10000 D. 4000 và 10000
Mark the letter A , B , C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges
Question 1 : John is talking to Daisy about her new blouse
- John : " You really have a beautiful blouse , Daisy , I've never seen such a perfect thing on you ! "
- Daisy : " ............................................................ "
A. I'm sorry to hear that B. Thanks , That's a nice compliment
C. Don't mention it D. Thanks for your gift !
Question 2 : Two friends are talking about the benefits of swimming
Daisy : " As far as I know , swimming is a really helpful thing for everyone to ỉmprove their health "
Mark : " ..................................................................... "
A. That sounds great B. I couldn't agree with you more
C. Take part in this summer D. That's fine for me .
Mark the letter A , B , C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions .
Question 1 : The man , together with his family , were invited to the Clambake last night
(A) The (B) together with (C) were (D) to the
Question 2 : For such a demanding job , you will need qualifications , soft skills and having full commitment
(A) such (B) will need (C) qualifications (D) having full commitment
Question 3 : Earth Hour is a worldwide event organizing to raise people's awareness about the need to take action on climate change .
(A) organizing (B) raise (C) need (D) take action
Mark the letter A ,B , C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions
Question 1 : Meaningful silence is always better than meaningless words
A. Meaningless words are not so good as meaningful silence
B. Meaningful silence is the best among meaningful words
C. Silence is always less meaningful than words are
D. Words are always meaningless , and so is silence
Question 2 : "I'll take the children to the park , " said the husband to his wife
A. The husband asked the wife to take the children to the park
B. The husband offered to take the children to the park
C. The husband insisted on taking the children to the park
D. The husband requested to take the children to the park
Question 3 : It is unnecessary for you to finish the report until tomorrow afternoon
A. You needn't finish the report until tomorrow afternoon
B. You have to finish the report until tomorrow afternoon
C. You may finish the report after tomorrow afternoon
D. You should finish the report until tomorrow afternoon
Question 4 : If her teacher hadn't advised her , she wouldn't have written such a good essay
A. Her teacher advised him and she didn't write a good essay
B. Her teacher didn't advise her and she didn't write a good essay
C. She wrote a good essay as her teacher gave her some advice
D. Without her teacher's advice , she would never have written such a good essay .
Question 5 : He started computer programming as soon as he left school
A. No sooner had he started computer programming than he left school
B. Hardly had he started computer programming when he left school
C. No sooner had he left school than he started computer programming
D. After he left school , he had started computer programming
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 1 to 5 .
Successful students often do the followings while studying . First , they have an overview before reading . Next , they look for important information and pay greater attention to it ( which often needs jumping forward or backward to process information ) . They also relate important points to one another . Also , they activate and use their prior knowledge . When they realize that their understanding is not good , they do not wait to change strategies . Last , they can monitor understanding and take action to correct or " fix up " mistakes in comprehension .
Conversely , students with low academic achievement often demonstrate ineffective study skills . They tend to assume a passive role , in learning and rely on others ( e.g.., teachers , parents ) to monitor their studying , for example , low - achieving students often do not monitor their understanding of content ; they may not be aware of the purpose of studying ; and they show little evidence of looking back , or employing " fix - up " strategies to fix understanding problems . Students who struggle with learning new information seem to be unaware that they must extent effort beyond simply reading the content to understand and remember it . Children with learning disabilities do not plan and judge the quality of their studying . Their studying may be disorganized . Students with learning problems face challenges with personal organization as well . They often have difficulty keeping track of materials and assignments , following directions , and completing work on time . Unlike good studiers who employ a variety of study skills in a flexible yet purposeful manner , low - achieving students use a restricted range of study skills . They cannot explain why good study strategies are important for learning ; and they tend to use the same , often ineffective study approach for all learning tasks , ignoring task content , structure or difficulty .
( Source : Adapted from Study Skills : Managing Your Learning - NUI Galway )
Question 1 : What is the topic of this passage ?
A. Successful and low - academic achieving students
B. Successful learners and their learning strategies
C. Study skills for high school students
D. Effective and ineffective ways of learning
Question 2 : The word " prior " in the first paragraph is closest meaning to ................ ?
A. important B. earlier C. forward D. good
Question 3 : According to the passage , what can be learnt about passive students ?
A. They depend on other people to organize their learning
B. They are slow in their studying
C. They monitor their understanding
D. They know the purpose of studying
Question 4 : Which of the following is NOT an evidence of monitoring studying ?
A. Being aware of the purpose of studying B. Monitoring their understanding of content
C. Fixing up mistakes in understanding D. Looking at their backs
Question 5 : The underlined pronoun " They " in the last sentence refers to .......................
A. study strategies B. study skills
C. low - achieving students D. good studiers
Read the following passage and mark the letter A , B , C or D to indicate the correct word or phrase that best fits each the numbered blanks.
Culture has a strong influence on non-verbal communication . Even the simple act of looking someone in the eye is not at all that simple . In the USA , Americans are (1)............ to look directly at people when speaking to them . It shows interest in what they are saying and is thought to carry a (2)................ of honesty . Meanwhile , in Japan and Korea , people avoid long periods of eye contact . It is considered more polite to look to the side during a conversation . The Lebanese , (3) ............. , stand close together and look intensely into each other's eyes . The action shows sincerity and gives people a better sense of what their counterparts want . Given such differences with even the most common expressions , people (4) .............. travel or work abroad have a real need to learn the other culture's body language . People tend to be unaware of the messages they are sending to others . So , it is useful to consider your own body language before dealing (5).............. people from other cultures . Knowing about the body language of friends , clients , and colleagues can be very helpful in improving understanding and avoiding miscommunication .
1. A. encouraged B. assisted C. forbidden D. opposed
2. A. sense B. taste C. sound D. touch
3. A. therefore B. in addition C. in contrast D. moreover
4. A. who B. where C. which D. whose
5. A. of B. with C. from D. over