Сборник задач по подготовке учащихся к международным исследованиям timss и pisa

Task 30. Compass

Question 1: Why is a compass needle points north (Figure 21)? Answer: .

Question 2: Why put a compass on the mirror?

1. 
   To be able to trigger an alarm
   
2. 
   To see the face of a lost
   
3. 
   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?

1. 
   Draw on this figure, the position of the compass needle and select on it north
   

2. 
   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 the formation of the planets and the subsequent release 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 it is other source of heat input to the Earth?
Answer: _ Question 3.
Explain why June 22 in the northern hemisphere - the longest daylight hours? Answer: . Question 4.
List the main sources of air pollution Answer: .
Question 5.
Tell us how measure:
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 the temperature during the day is observed after sunrise?
Answer: .

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