grade 6 , con 4 , lesson 5

During melting process, matter starts to change from.........state to......state

• liquid-gas

• solid-liquid

• liquid-solid

• solid-gas

The spaces between molecules.........during the melting of solids.

• increase

• decrease

• do not change

• may increase or decrease

By decreasing the temperature of a substance, its molecules move......... each other and the spaces between them

• farther from-increase.

• closer to increase.

• farther from - decrease.

• closer to decrease.

By increasing the temperature of a substance, its molecules move ............. Each other and the spaces between them........

• farther from - increase.

• closer to increase.

• farther from-decrease.

• closer to decrease.

A metallic rod of 50 metre length was heated at high temperature, its length could reach........ metre after heating.

• 47

• 48

• 49

• 51

Materials.........on heating.

• expand

• contract

• compress

• does not change

A tightly closed metai lid of a glass bottle can be opened more easily if it is put in...... for some time.

• cold water

• iced water

• cold vinegar

• hot water

When a liquid is cooled it may change into gas

• True

• False

When the temperature of solids increases their volume decrease

• True

• False

Substance change from liquid state into gas state during evaporation process

• True

• False