Vật thứ nhất có khối lượng m₁ = 0,5kg đang chuyển động với vận tốc v₁ = 4m/s thì va chạm vào vật thứ hai có khối lượng m₂ = 0,3kg đang chuyển động ngược chiều với vận tốc v₂ = 2m/s. Sau va chạm chúng dính với nhau và cùng chuyển động. Tìm vận tốc và hướng chuyển động của chúng ngay sau va chạm

 Một hòn đá khối lượng 500g, bay với vận tốc 72km/h. Động lượng của hòn đá đó là

1) Chọn phát biểu sai khi nói về động lượng của một vật

A. Động lượng là đại lượng Vectơ

B. Độ lớn động lượng bằng tích khối lượng và vận tốc vật

C. Động lượng luôn ngược hướng với vận tốc

D. Động lượng luôn cùng hướng với vận tốc vì khối lượng luôn luôn dương

2) Chọn phát biểu đúng. Động lượng của một hệ cô lập là một đại lượng

A. Không xác định

B. Bảo toàn

C. Không bảo toàn

D. Biến thiên

Cho bảng số liệu sau

Tỉ lệ dân cư thành thị và nông thôn thời kì 2005- 2020

                                                                                                                 ( Đơn vị: %)

dựa vào bảng số liệu trên tính tỉ lệ dân thành thị tăng bao nhiêu?

A.7,2%                    B.8,2%                         C.9,2%                    D.10,2%

For/ since/ ago…

1.I have watched my mother make pizza _____ but I cannot make even a pizza myself. 

A. every year B. for years C. many years ago D. in many years

2.It’s 8 months……. I last saw Tom.

A. for B. ago C. since D. when

3.My wife and I have moved three times____ we got married.

A. for B. since C. until D. when

Although/ In spite of (despite)/ Because/ Because of

1._______ the high crime rate, many people like to live in big cities.

A. Because B. In spite of C. Because of D. Although

2.__________ all my warning, he tried to fix the computer himself.

A. Although B. In spite of C. Because D. Instead of

3.We all had to stay home __________________.

A. because the coming storm B. because of the coming storm

C. In spite of the coming storm D. although the storm was coming

4.The party had been delayed ………………the host’s mistake.

A. because B. although C. because of D. in spite of

5.We stayed indoors in spite of ............... 

A. the bad sight B. the sight was bad C. the beautiful sight D. the sight was beautiful

6.A lot of things went wrong…………………I had planned everything carefully.

A. because of B. because C. in spite of D. although

7. ……….her absence from school yesterday, she couldn’t understand the lesson.

A. Despite B. Because of C. Because D. Although

8.My sister left her job_______ the good salary.

A. because of B. in spite of C. although D. because

9.She bought the book _____she had heard it was very good.

A. because of B. despite C. because D. although

10.He still didn’t understand the puzzle_______ I tried to explain many times.

A. because B. although C. despite D. because of

11.My mother is always complaining ______________the untidiness of my room.

A. although B. because of C. despite D. because

12._____ floods destroy many things, they also make the soil riches.

A. In spite of B. Because C. Although D. Because of

13.There were a lot of accidents …………………the icy roads.

A. because B. because of C. though D. in spite of

14. …………………being selfish, he has no friends.

A. Although B. Because C. In spite of D. Because of

Prepositions

1.The heavy rain prevented us ____________ going out for a picnic.

A. on B. in C. from D. for

2.“Hey Kate, need a hand?” – “Well, I’m perfectly capable ____________ doing it myself, thank you.”

A. on B. in C. at D. of

3.They can’t earn enough for living. They are ________ need of many things.

A. in B. of C. on D. for

4.International Women’s Day is observed ________March 8th.

A. In B. At C. Of D. On

5.One disadvantage of TV is that it interferes ……………….. family life.

A. for B. to C. with D. of

6.They often go to the cinema _______Saturday nights.

A. in B. at C. on D. by

7.They are going ______ a boat trip on the Thames.

A. on B. in C. at D. for

Articles

8.Government should help____________ poor in the countryside.

A. a B. an C. the D. 

9.Dogs are often trained to lead ________ blind.

A. a B. the C. an D. Ø

10. ……………… Internet helps us to interact with other people around the world.

A. A B. An C. The D. Ø

11. ……….digital cameras use no ……….film at all.

a.  / b. The / a c. A / the d. The / 

1.They tried to find a way of bettering their lives. The SYNONYM meaning of the underlined word is _____.

A. moving B. changing C. achieving D. improving

2.They tried to find a way of bettering their lives. The OPPOSITE of the underlined word is …….

A. improving B. worsening C. achieving D. surprising

3.She was born and grown up in a picturesque fishing village in Ha Long Bay. The opposite of the underlined is …….

A. ugly B. dangerous C. poor D. wealthy

4.She was born and grown up in a picturesque fishing village in Ha Long Bay. The underlined means ___ 

A. pretty B. dangerous C. poor D. wealthy

5.Many peasants find it difficult to make ends meet. The underlined means …..

A. get plenty of food   B. better their life C. earn enough money for living  D. apply new farming method

6.At last, the discussion came to an end with the sound conclusions. The OPPOSITE of the underlined is____.

A. complete B. finish C. begin D. arrive

7.How can she find a way of making her life better? The underlined means ………….

A. bettering her life B. earn money for her living C. being good at her life D. making it bad

8.After the meal, the picnickers put all the leftovers in plastics bags before putting them in a nearby dustbin. 

A. remains B. eating things C. paper cups        D. rubbish

9.The cottage is surrounded by the most glorious countryside. The underlined means ____

A. beautiful B. ordinary C. gloomy        D. honorable

10.The contest aimed to stimulate the spirit of learning English among students. The OPPOSITE of the underlined word is _______ A.  increase              B. gain C. discourage D. encourage

11.The mechanization of farm work has helped farmers to grow more cash crops.

A. money for farming B. crops grown for their own use

C. crops grown for selling D. money put in the bank

12.Thanks to the new farming methods, the farmers have had bumper crops in recent years.

A. very large B. very poor C. unusually bad D. extremely poor

1.Outdoor activities help students know one another better and feel more ………….. of themselves.

A. proud B. convenient C. physical D. confident

2.In many areas, many families have to work hard all day just to …………...

A. make ends meet B. meet wishes C. achieve D. result in

3.The ………are sources of information and news such as newspapers, magazines, radio and T.V.

A. mass media B. news media C. print media D. electronic media

4.The news you have got from the Internet is not really a reliable ………

a. source b. well c. procedure d. resource

5.I don’t like watching TV with Anna. She keeps changing the ……………….

A. films B. videos C. programs D. channels

6.Lisa wondered whether her parents would give her ____to join her classmates for the excursion.

A. agreement B. permission C. persuasion D. allowance

7.A film made by photographing a series of changing drawings is a ……………….

A. drama B. cartoon C. comedy D. documentary

8.By listening to the radio, we receive information……………….

A. orally B. visually C. aurally D. through our eyes

9.A……………….film shows some actual aspects of human or social activity.

A. comedy B. drama C. serial D. documentary

10.The introduction of new farming methods ______ in better crops.

A. offered B. finished C. resulted D. completed

11.The road has recently been ______ so that its surface is higher and no longer muddy in the rainy season.

A. degraded B. resurfaced C. lengthened D. enriched