Тест на тему Корпускулярно-волновой дуализм. Давление света. Гипотеза де Бройля.

Тест по английскому языку: Past Perfect (8 класс)

Инструкции:

Выберите правильный ответ из предложенных вариантов.

1. When I arrived, they ______ already gone.
a) had
b) have
c) was

2. She ______ finished her homework before dinner.
a) has
b) had
c) was

3. They didn't want to go out because it ______ rain.
a) had
b) was
c) had had

4. After he ______ left, I felt lonely.
a) had
b) have
c) was

5. By the time we got to the cinema, the movie ______ started.
a) has
b) had
c) was

6. I couldn’t believe he ______ never seen snow before.
a) had
b) has
c) was

7. She felt tired because she ______ slept well.
a) hadn’t
b) doesn’t
c) hasn’t

8. We ______ eaten before they arrived.
a) had
b) have
c) was

9. After they ______ finished eating, they went for a walk.
a) had
b) have
c) was

10. He didn’t call because he ______ forgotten my number.
a) had
b) has
c) was

11. By the end of the week, they ______ completed the project.
a) had
b) have
c) was

12. She was happy because she ______ learned the song.
a) had
b) has
c) was

13. They ______ never been to Paris before last summer.
a) have
b) had
c) was

14. We were late because we ______ lost on the way.
a) had
b) have
c) was

15. The teacher asked if I ______ done my assignment.
a) had
b) have
c) was

Ответы:

1. a) had
2. b) had
3. a) had
4. a) had
5. b) had
6. a) had
7. a) hadn’t
8. a) had
9. a) had
10. a) had
11. a) had
12. a) had
13. b) had
14. a) had
15. a) had

Удачи на тесте!

Тест по Алгебре на тему "Система уравнений" для 9 класса

Вопросы:

1. Решите систему уравнений: [ \begin{cases} 2x + 3y = 12 \ 4x - y = 5 \end{cases} ] Ответ:

2. Решите следующую систему уравнений: [ \begin{cases} x - 2y = -1 \ 3x + y = 7 \end{cases} ] Ответ:

3. Решите систему уравнений с помощью подстановки: [ \begin{cases} y = 2x + 3 \ 3x - y = 4 \end{cases} ] Ответ:

4. Определите, имеют ли следующая система уравнений решение (прямые пересекаются, параллельны, совпадают): [ \begin{cases} 4x + 2y = 8 \ 2x + y = 4 \end{cases} ] Ответ:

5. Решите систему уравнений методом сложения: [ \begin{cases} 3x + 4y = 10 \ 2x - 4y = 3 \end{cases} ] Ответ:

6. Решите систему уравнений: [ \begin{cases} x + y = 5 \ x - y = 1 \end{cases} ] Ответ:

7. Какое значение имеет переменная x в следующей системе уравнений? [ \begin{cases} 5x + 2y = 20 \ 3x - 4y = -2 \end{cases} ] Ответ:

8. Решите систему уравнений, используя любой подходящий метод: [ \begin{cases} 7x + 2y = 16 \ 3x + 5y = 9 \end{cases} ] Ответ:

9. Решите систему уравнений и найдите сумму x и y: [ \begin{cases} x + 3y = 7 \ 2x - y = 4 \end{cases} ] Ответ:

10. Составьте систему уравнений по следующему условию и решите ее: a. Площадь прямоугольника равна 50, b. Периметр прямоугольника равен 30. Пусть длины сторон прямоугольника — это x (длина) и y (ширина). Ответ:

Ответы:

1. ( x = 2, y = 2 )
2. ( x = 3, y = 2 )
3. ( x = 1, y = 5 )
4. Параллельны (очевидно совпадение уравнений).
5. ( x = 2, y = 1 )
6. ( x = 3, y = 2 )
7. ( x = 2 )
8. ( x = 2, y = 3 )
9. ( x + y = 5 )
10. Система: ( xy = 50, 2(x + y) = 30 ); Решение: ( x = 10, y = 5 ).

Этот тест поможет школьникам закрепить свои знания о системах уравнений и разных методах их решения.