Тест на тему чехов мальчики

Тест по химии (уровень: 10 класс) Тип вопросов: Открытый вопрос Количество вопросов: 1 Вывод теста с ответами: Да

Вопрос: В 1 л раствора бинарного электролита AB, диссоциирующего по схеме AB ⇌ A⁺ + B⁻, начальная концентрация AB равна C0 = 1,0×10⁻³ М. При равновесии в растворе содержится N_total частиц (молекул AB и ионов A⁺ и B⁻) = 6,041×10²⁰. Определите степень диссоциации α данного электролита.

Ответ: Пояснение:

• Общее число молекул AB в 1 л до диссоциации: n0 = C0 × V × NA = (1,0×10⁻³ моль) × (6,022×10²³ мол⁻¹) × 1 л = 6,022×10²⁰ частиц.
• При диссоциации AB ⇌ A⁺ + B⁻: если α — доля диссоциировавших формул на начальном объёме, то: n_AB = n0 (1 − α) n_A⁺ = n0 α n_B⁻ = n0 α Общее число частиц: N_total = n_AB + n_A⁺ + n_B⁻ = n0 (1 − α) + n0 α + n0 α = n0 (1 + α).
• Заданное N_total = 6,041×10²⁰. Следовательно: α = (N_total / n0) − 1 = (6,041×10²⁰ / 6,022×10²⁰) − 1 ≈ 1.00316 − 1 ≈ 0,00316.

Ответ: α ≈ 0,00316, то есть примерно 0,316%.

Тест по английскому языку (Present Simple) Класс: 11 Тип: Множественный выбор Количество вопросов: 20 Ответы: указаны после списка вопросов

1. She usually ___ to the gym after work. A) go B) goes C) going D) went

2. I ___ coffee in the morning. A) don't drink B) doesn't drink C) not drink D) not drinks

3. Which sentence is in Present Simple? A) He is running. B) They run every day. C) She is studying. D) I am going.

4. What is the correct question form: "_____ your brother live in New York?" A) Do B) Does C) Doest D) Did

5. He ___ tea; he drinks coffee. A) doesn't drink B) don't drink C) isn't drinking D) not drinks

6. Which sentence expresses a habit? A) It is raining now. B) He reads books every evening. C) The sun rises in the west. D) They are playing football.

7. Choose the sentence with the correct third-person singular form of "to have." A) He have a car. B) She has a car. C) It have a car. D) They has a car.

8. Which sentence uses Present Simple correctly with subject "I"? A) I goes to school by bus. B) I go to school by bus. C) I goes to school by bus. D) I going to school by bus.

9. Where do we place the adverb "always" in the sentence "She __ late"? A) She always is late. B) She is always late. C) She is late always. D) Always she is late.

10. What is the correct negative form: "They ___ travel by plane"? A) don't travel B) doesn't travel C) not travel D) not travels

11. Which sentence expresses a permanent fact? A) The Earth circles the Sun. B) The Earth is circling the Sun. C) The Earth will circle the Sun. D) The Earth has circled the Sun.

12. Complete the sentence: "My brother ____ in a big company." A) work B) works C) working D) to work

13. Which sentence uses "anymore" correctly? A) He doesn't live here anymore. B) He doesn't lives here anymore. C) He don't live here anymore. D) He not lives here anymore.

14. Choose the correct question form for "They go to school by bus." A) Do they go to school by bus? B) Do they goes to school by bus? C) Does they go to school by bus? D) Are they go to school by bus?

15. Which sentence is incorrect? A) Every Monday I go to the library. B) She don't like pizza. C) They usually play football in the park. D) He often goes to the cinema.

16. Choose the sentence with correct use of third-person singular for "to go." A) He go to school. B) He goes to school. C) He goed to school. D) He going to school.

17. Complete: "The cat ___ on the sofa every afternoon." A) sleep B) sleeps C) sleeping D) slept

18. Which question uses "how often" correctly? A) How often you go to the gym? B) How often do you go to the gym? C) How often you goes to the gym? D) How do you go to the gym often?

19. Choose the sentence with correct use of "to be" in Present Simple. A) She are a teacher. B) They is teachers. C) He is a teacher. D) You is a teacher.

20. Which sentence expresses a routine with time expression "every morning"? A) He is waking up. B) He wakes up every morning. C) He wake up every morning. D) He waking up every morning.

Ответы:

1. B
2. A
3. B
4. B
5. A
6. B
7. B
8. B
9. B
10. A
11. A
12. B
13. A
14. A
15. B
16. B
17. B
18. B
19. C
20. B

Тест по информатике на тему "Системы счисления"

Класс: 8
Предмет: Информатика
Тема: Системы счисления
Тип вопросов: Единственный выбор
Количество вопросов: 7

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Вопрос 1: Какое основание имеет двоичная система счисления?
a) 2
b) 8
c) 10
d) 16

Ответ: a) 2

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Вопрос 2: Какой из указанных чисел является числом в восьмеричной системе счисления?
a) 77
b) 12
c) 17
d) 23

Ответ: a) 77

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Вопрос 3: Какой десятичный эквивалент числа 1011 в двоичной системе счисления?
a) 11
b) 8
c) 10
d) 12

Ответ: a) 11

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Вопрос 4: Какое основание имеет десятичная система счисления?
a) 2
b) 10
c) 8
d) 16

Ответ: b) 10

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Вопрос 5: В шестнадцатеричной системе счисления какой цифре соответствует число 15 в десятичной системе?
a) F
b) E
c) D
d) C

Ответ: a) F

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Вопрос 6: Какой из следующих вариантов - правильное число в двоичной системе?
a) 102
b) 110
c) 201
d) 33

Ответ: b) 110

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Вопрос 7: Какое из следующих чисел является числом в шестнадцатеричной системе счисления?
a) 1A
b) 15
c) 27
d) 39

Ответ: a) 1A

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