Unit test 5. Materials and Their Structure

Which particle has a positive electrical charge?

• Neutron
• Electron
• Proton
• Atom

How are atoms held together?

• By gravitational force

• By nuclear force

• By electrostatic force

• By magnetic attraction

How is Thomson's model of the atom different from the one scientists use today?

• Thomson suggested atom was the electrons scattered randomly of the atom

• Thomson suggested atom was indivisible

• Thomson suggested atom was mostly empty space

• Thomson suggested atom contains neutrons

What percentage of 6 carat gold is gold?

• 100 %

• 75 %

• 50 %

• 25 %

Which elements may cause a diamond to be green? EXCEPT

• Nitrogen

• Oxygen

• Nickel

• Hydrogen

What mass of salt (3.5 %) in seawater of 1000 g?

• 35 g

• 3.5 g

• 0.35 g

• 350 g

Which are the characteristics of Arid zone?

• Mild winters and hot, dry summer

• Hot and wet all year

• Hot and dry all year

• Very cold all year

Which are the characteristics of Temperate zone?

• Cold winters and mild summers

• Very cold all year

• Mild winters and hot, dry summers

• Very cold all year

Which are the characteristics of Polar zone?

• Very cold and dry all year

• Cold winters and mild summers

• Very cold all year

• Mild winters and hot, dry summers

Which is the differentiation between Interglacial and glacial period?

• Interglacial period is permanent ice close to North and south pole, Glacial period is ice much further from North and south Pole

• Interglacial period is colder phase, glacial period is warmer phase

• Interglacial period happens every year, glacial period happen every season

• Interglacial period has more ice sheets, glacial period has less ice sheet