The graph shows the number of computers infected with a virus at one company over timeA. Which statement is true about the function that relates number of infected computers to time.. H
Trang 1ĐỀ THI OLYMPIC TIẾNG ANH LỚP 10 NĂM HỌC 2013
VÒNG 18 – ĐỀ SỐ 1
Chọn câu trả lời tốt nhất cho những câu hỏi dưới đây.
1 Which number is rational?
A π B π/2 C √21 D √25 E √12
2 The graph shows the number of computers infected with a virus at one company over time Which statement is true about the function that relates number of
infected computers to time?
A It is linear with a positive slope.
B It is linear with a negative slope.
C It is nonlinear and always increasing.
Trang 2D It is nonlinear and always decreasing.
E None of them
3 A journalist is researching customer satisfaction among car owners He decides
to survey a random selection of car owners Which of the following is the best
method of getting a random selection of car owners?
A wait outside a new car dealership and survey new owners
B get a list of customers from a local mechanic
C put an ad in the car section of the newspaper requesting participants
D get a list of car owners from the state department of motor vehicles
E None of them
4 The instructions for a painter’s ladder indicate the following: For the ladder to be
at the proper angle with the ground, the distance from the bottom of the wall to the bottom of the ladder should be one-fourth the length of the ladder Which equation could be solved to find the measure of the angle that the ladder should make with the ground?
A cos A = 4 B cos A = 1/4 C sin A = 4 D sin A = 1/4
E sin A = 1/3
Trang 35 Since 1994, the Winter Olympics have been held in even-numbered years that are not divisible by 4 If this pattern continues, in which of the following years will a Winter Olympics be held?
A 2015 B 2020 C 2034 D 2040 E 2050
6 A restaurant uses tables shaped like trapezoids The chart shows the number of people that can be seated when 1, 2, and 3 tables are put together in a row Based on the pattern shown in the chart, which expression gives the number of people that can be seated in a row of n tables?
A n B n + 3 C 4n + 3 D 3n + 2 E 2n
7 Which list shows the numbers 1.2, 5 / 4 , 7 / 6 , and 7 / 8 in order from least to greatest?
A 7/8, 5/4, 1.2, 7/6 B 7/8, 7/6, 1.2, 5/4 C 5/4, 7/8, 1.2, 7/6
D 5/4, 7/8, 7/6, 1.2 E 1.2, 7/8, 5/4, 7/6
Trang 48 The figure shows ΔABC on the coordinate plane What are the coordinates of the ABC on the coordinate plane What are the coordinates of the image of point A after the triangle is reflected over the y-axis?
A (3, 6) B (6, –3) C (–6, –3) D (–6, 3)
E (–6, 13)
Trang 59 In the figure, lines l and m are parallel Which pair of triangles must be similar?
A ΔABD and ΔCED ABD and ΔABD and ΔCED CED B ΔABD and ΔCED ABC and ΔABD and ΔCED BCE
C ΔABD and ΔCED BCD and ΔABD and ΔCED ABD D ΔABD and ΔCED ECD and ΔABD and ΔCED BCD
E ΔABD and ΔCED EAD and ΔABD and ΔCED BCD
10 The surface area, S, of a sphere with radius r is given by the formula S = 4πrr 2 The radius of a basketball is 6 times the radius of a Ping-Pong ball How many times greater is the surface area of the basketball than the surface area of the Ping-Pong ball?
A 3 B 6 C 12 D 36 E 45