Сборник задач по подготовке учащихся к международным исследованиям timss и pisa

Task 4. Acid rain

1. 
   acid waste from chemical plants merge into the river.
   
2. 
   acids used in chemical laboratories, evaporate into the air.
   
3. 
   The gases formed during the combustion of coal and oil, are dissolved in water contained in the atmosphere.
   
4. 
   gases produced during operation of air conditioners and refrigerators into the atmosphere.
   

Task 5. The alcohol

Aidana got home from work. Entering the house, she rushed into the room, because she felt a sharp smell of alcohol. Upon entering the room she saw a bottle lying and cat. In the bottle was still 20 g content (this is half of what it was), and the cat lying on the floor, like a big white bun, legs spread wide, and continuing to lick the floor.
Question. How many grams of alcohol a cat licked off the floor, if its share in cologne - 96% (evaporation neglected)?
A.19,2 g 100% alcohol. B.29,6 g 100% alcohol. C.16,4 g 100% alcohol. D.12,2100%alcohol.

Task 6.

Light travels a distance of about 8 minutes from the Sun to the Earth. You watch the sunrise at exactly 5:00. At what time you would have seen the same rise, if the light propagated instantaneously?

1. 
   In the 4 hours 52 minutes.
   
2. 
   At 5 o'clock sharp.
   
3. 
   5 hours minutes.
   

Task 7

We note that in recent years, the weather began to change significantly: the prolonged winter, late spring, cool summer.
What problems could cause global cooling?

Task 8

Match the traveler's name, and they made the discovery.

Table 1.

Last name of traveler	Opening
A.Tasman	The first trip around the world
Vasco Da Gama	discovered New Zealand and the east coast of Australia.
James Cook	I discovered the island, which we call Tasmania
F. Magellan	First discovered the sea route to India

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