Đề thi tuyển sinh Đại học năm 2014 môn Tiếng Anh Khối A1 - Mã đề thi 973 (Có đáp án)
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 10.
The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon
can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium
chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is
due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their
outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The
lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively
charged they attract the ions and this is what keeps the structure together.
An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they
can be made to flow in one direction when a source of electrical energy such as a battery is connected to the
metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good
conductors of electricity. The only other common solid conducting material that pencil users are likely to
encounter is graphite (what the ‘lead’ of a pencil is made from). Graphite is a form of carbon and again the
carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric
current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to
create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in
water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.
Electrical insulators are substances that cannot conduct electricity well either, because they contain no
charged particles or any charged particles they might contain do not flow easily. Water itself is a poor
conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water
molecule are partly charged but overall the molecule is neutral). However, most water we encounter does
contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that
occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin
through perspiration and it dissolves in the water to make it more conductive.
By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP
Question 1: Electrical conductivity is ______.
A. one of the key properties of most solid materials
B. impossible for any substance when it is dissolved in water
C. completely impossible for silicon
D. one of the most important properties of metals
Question 2: According to the passage, a metal can conduct electricity due to ______.
A. the way its atoms bond together
B. the absence of free electrons
C. its atoms with a positive charge
D. the loss of one electron in the core of its atoms
Question 3: The word “outermost” in paragraph 1 mostly means ______.
A. nearest to the inside B. the heaviest
C. furthest from the inside D. the lightest
correct answer to each of the questions from 1 to 10.
The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon
can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium
chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is
due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their
outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The
lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively
charged they attract the ions and this is what keeps the structure together.
An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they
can be made to flow in one direction when a source of electrical energy such as a battery is connected to the
metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good
conductors of electricity. The only other common solid conducting material that pencil users are likely to
encounter is graphite (what the ‘lead’ of a pencil is made from). Graphite is a form of carbon and again the
carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric
current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to
create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in
water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow.
Electrical insulators are substances that cannot conduct electricity well either, because they contain no
charged particles or any charged particles they might contain do not flow easily. Water itself is a poor
conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water
molecule are partly charged but overall the molecule is neutral). However, most water we encounter does
contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that
occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin
through perspiration and it dissolves in the water to make it more conductive.
By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP
Question 1: Electrical conductivity is ______.
A. one of the key properties of most solid materials
B. impossible for any substance when it is dissolved in water
C. completely impossible for silicon
D. one of the most important properties of metals
Question 2: According to the passage, a metal can conduct electricity due to ______.
A. the way its atoms bond together
B. the absence of free electrons
C. its atoms with a positive charge
D. the loss of one electron in the core of its atoms
Question 3: The word “outermost” in paragraph 1 mostly means ______.
A. nearest to the inside B. the heaviest
C. furthest from the inside D. the lightest
6 trang
04/04/2023
10460
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BỘ GIÁO DỤC VÀ ĐÀO TẠO ĐỀ CHÍNH THỨC (Đề có 6 trang) ĐỀ THI TUYỂN SINH ĐẠI HỌC NĂM 2014 Môn: TIẾNG ANH; Khối A1 Thời gian làm bài: 90 phút, không kể thời gian phát đề Mã đề thi 973 Họ, tên thí sinh:.......................................................................... Số báo danh:............................................................................ ĐỀ THI GỒM 80 CÂU (TỪ QUESTION 1 ĐẾN QUESTION 80) 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 10. The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the...our skin through perspiration and it dissolves in the water to make it more conductive. By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP Question 1: Electrical conductivity is ______. A. one of the key properties of most solid materials B. impossible for any substance when it is dissolved in water C. completely impossible for silicon D. one of the most important properties of metals Question 2: According to the passage, a metal can conduct electricity due to ______. A. the way its atoms bond together B. the absence of free electrons C. its atoms with a positive charge D. the loss of one electron in the core of its atoms Question 3: The word “outermost” in paragraph 1 mostly means ______. A. nearest to the inside B. the heaviest C. furthest from the inside D. the lightest Question 4: The atoms of a metal can bond together because ______. A. they lose all of their electrons B. negatively charged electrons attract positive ions C. the lost electrons cannot move freely in the sea of electrons D. electrons can flow in a single direction Trang 1/6 – Mã đề 973 Trang 2/6 – Mã đề 973 Question 5: Salt in its solid state is not able to conduct electricity because ______. A. it cannot create any charged ions B. its charged ions can flow easily C. its charged ions are not free to move D. it has free electrons Question 6: The word “they” in paragraph 3 refers to ______. A. charged particles B. electrical insulators C. electric currents D. charged ions Question 7: Water is a poor conductor because it contains ______. A. only a small amount of fully charged particles B. only a negative electric charge C. no positive or negative electric charge D. only a positive electric charge Question 8: We can have problems when touching electrical devices with wet hands because ______. A. the water containing no charged particles makes it more conductive B. the water contains too many neutral... B. helpless C. defenseless D. vulnerable Question 20: Applications _____ in after 30th April will not be considered. A. send B. which sent C. sent D. that is sent Question 21: The superstar, accompanied by the other members of the band, ______ to visit our school next week. A. has had B. are going C. are D. is going Question 22: The higher the content of carbon dioxide in the air is, ______. A. the more heat it retains B. the heat it retains more C. it retains the more heat D. more heat it retains Trang 3/6 – Mã đề 973 Question 23: Kay: “I wouldn’t do that if I were you.” John: “______” A. Wouldn’t you? Why? B. I’d rather you didn’t. C. Would you, really? D. It’s out of the question. Question 24: The theory of relativity ______ by Einstein, who was a famous physicist. A. developed B. is developed C. develops D. was developed Question 25: Mrs. Chau has managed the department ______ that she’ll be promoted next month. A. too successful B. too successfully C. very successful D. so successfully Question 26: Sammy had worked in England for a year ______ moving to Scotland. A. while B. before C. once D. until Question 27: Be sure not to rely too ______ on your mother tongue when you are learning a foreign language. A. numerously B. heavily C. abundantly D. severely Question 28: “It’s about time you ______ your homework, Mary.” A. must do B. did C. will do D. do Question 29: ______ was the tea that we couldn’t drink it. A. How strong B. So strong C. No longer D. Hardly ever Question 30: The girl was used ______ birthday presents from her brothers. A. to receive B. to be receiving C. to being received D. to receiving Question 31: We received a call from the teacher ______ charge of our course. A. to B. on C. in D. at Question 32: ______ always gives me real pleasure. A. While arranging flowers B. The flowers are arranged C. Arranging flowers D. I arrange flowers Question 33: I could hear voices but I couldn
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