Iron adopts changes slowly and gradually by process of

• rusting
• moldings
•    fermentation
• explosions

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Burning of fireworks is a change which is

• reversible
• irreversible
• both a and b
• constant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Salt can be separated from water in a salty solution by

• sorting

• filtering

• sieve

• leaving at room temperature

Separation of common salt from the sea water is by

• sieving
• evaporation
• magnetic separation
• winnowing

The method used to separate substances differing in colour, size and shape from a solid mixture

• magnetic separation
• decantation
• handpicking
• sieving

In a mixture, solids of different size can be separated by

• magnetic separation

• winnowing

• sorting

• evaporation

The method used to separate the seeds from the fruit juice is

• Evaporation

• sieving

• crystallization

• winnowing

Heat gain makes ice to

• freeze
• evaporate
•    melt
•    dissolve

Tags

NGSS.MS-PS1-4

Liquid water evaporates or boils to turn into water vapour and steam by gaining

• water

• heat

• pressure

• density

Change which can go back to its original shape is called

•    reversible
•   irreversible
•    same
•    constant