Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
жүктеу/скачать 3,47 Mb. Pdf көрінісі
|
Тимс,Пизаға дайындық
- Бұл бет үшін навигация:
- Task 31. Atmosphere
| Task 30. Compass
A compass is an instrument used for navigation and orientation that shows direction relative to the geographic "cardinal directions", or "points". Magnetic compass begin giving incorrect values when it’s close to other compass or close to a steel objects. Pic 21. Question 1: Why is a compass needle directed to the north (Figure 21)? Answer: ______________. Question 2: Why is a compass on the mirror? A. To be able to trigger an alarm B. To see the face of a lost C. To light a fire in a sunny day Question 3. Assume that you are in the woods and got lost, you urgently need to find a way back home to the north, because it's getting dark. Unfortunately you have no compass. Your actions? Answer:__________________________________________________________ _. Question 4. pic 22 shows a compass needle with marked on it the northern (N) and south (S) poles. A compass is placed close to the magnet, as shown in the next picture. A. Draw on this figure, the position of the compass needle and point on it north (N) and south (S) poles. B. Explain the answer using your knowledge of magnets. Task 31. Atmosphere Atmosphere is the gaseous envelope of a celestial body which held by gravity around him. The initial composition of the planet's atmosphere is usually dependent on the chemical properties of the sun and the temperature during 166 the formation of the planets and the subsequent emission of external gases. Then the composition gas shell evolves under the action of various factors. The Earth's atmosphere is largely a product of living organisms in it. Approximate composition of the Earth's atmosphere: 78.08% nitrogen, 20.95% oxygen, varying amounts of water vapor (an average of about 1%), 0.93% argon, 0.038% carbon dioxide and a small amount of hydrogen, helium, other noble gases and pollutants. Question 1. Determine the time of day on the picture 24. A B C Question 2. Besides the Sun what is the other source of heat input to the Earth? Answer:__________________________________________________________ Question 3. Explain why June, 22 in the northern hemisphere is the longest daylight hours? Answer: ______________ __________________________________________. Question 4. List the main sources of air pollution Answer: ______________. Question 5. Tell us how is measured: A temperature on the thermometer; B. atmospheric pressure on the barometer; C. wind speed and direction by weather vane. Question 6. Explain why the lowest temperature during the day is observed after sunrise? Answer: ______________. |