science practice exam

We can change materials from solid to a liquid by ……………….

• cooling

• heating  

• breaking

Which of the following is reversible? (Changes back to the original state).

• bread

• egg

• ice

Which of the following is irreversible? (Cannot change back to original state).

• bread

• ice

• chocolate

Which of the following circuits makes the bulb light up?

• 
• 
• 

Days and nights  

• 
• 

12 months

• 
• 

Salt, sugar, and coffee dissolve faster in cold water.

• true

• false

The Sun is the brightest source of light.

• true

• false

When …………………… is heated, it turns back to water again.

• chocolate

• ice

• steel

The aluminum and …………………… need a lot of heat to change into a liquid.

• steel

• ice

• egg