CHEMISTRY [1 Mark Question Answer]

State whether the following are physical changes.
Rusting of iron

State whether the following are physical changes.
Glowing of an electric lamp

State whether the following are physical changes.
Cooking of food

State whether the following are physical changes.
Bursting of a fire cracker

State whether the following are physical changes.
Dissolving sugar in water

State whether the following are physical changes.
Burning of wood

State whether the following are physical changes.
Photosynthesis

State whether the following are physical changes.
Formation of curd from milk

State whether the following are physical changes.
Drying of wet clothes

Name the following.
A type of change that can be returned to its original form by reversing the conditions.

Name the following.
a type of change that is repreated at regular intervals of time

Name the following.
A type of change that is useful to us

Name the following.
A type of change that occurs within a very short period of time

Name the following.
A type of change that is made by humans

Tick the correct words.
Heating of sugar is a (chemical/physical) change.

Tick the correct words.
Phases of the moon is a (periodic/man-made) change.

Tick the correct words.
Germination of seeds is an (undesirable/irreversible) change.

Tick the correct words.
a cyclone is (a periodic/undesirable) change.

Tick the correct words.
The eruption of a volcano is a (fast/man-made) change.

Are the following changes reversible or irreversible ?
Burning of a piece of paper

Are the following changes reversible or irreversible ?
Glowing of an electric bulb

Are the following changes reversible or irreversible ?
Dissolving of sugar in water

Are the following changes reversible or irreversible ?
Ripening of fruits

Tick the type of change that occurs in the cases.
Change of day and night (periodic/non-periodic)

Tick the type of change that occurs in the cases.
Erosion of soil (desirable/undesirable)

Tick the type of change that occurs in the cases.
Evaporation of water from a lake (slow/fast)

Tick the type of change that occurs in the cases.
Growth of a tree (natural/man-made)