Physical and Chemical Changes
A quiz about reversible and irreversible changes, including expansion, contraction, melting, freezing, rusting, and chemical reactions in everyday materials.
Questions
All chemical reactions are :
- reversible
- irreversible
- exothermic
- endothermic
Which of the following changes are irreversible?
- Milk to paneer
- Cow dung to biogas
- Grain to its flour
- All of the above
Iron adopts changes slowly and gradually by process of :
- rusting
- moldings
- fermentation
- explosions
Burnt sparklers and burnt books pages are examples of
- reversible change
- irreversible change
- no change
- none of the above
Which of the following is not a reversible change?
- Heating of water to steam
- Cooking of egg to scrambled eggs
- Heating of wax to molten wax
- Cooling a cake
Which of the following change cannot be reversed ?
- Hardening of cement
- Freezing of ice cream
- Opening a door
- Melting of choclate
Burnt sparklers and burnt books pages are examples of:
- reversible process
- irreversible process
- rusting
- none of these
Which of the following changes are irreversible?
- Raw egg to boiled egg
- Woollen yarn to knitted sweater
- Bud to flower
- All of the above
Which of the following represents a reversible change?
- A metal rod on heating expands (its length increases).
- A metal rod on cooling contracts (its length decreases).
- Both of the above
- None of the above
Small gaps are left between the metal rails on railway tracks in order to allow for :
- expansion of the metal rails on cold days
- contraction of the metal rails on hot days
- contraction of the metal rails on cold days
- expansion of the metal rails on hot days
The density of a certain solid object is greater than the density of the liquid. If it is placed in water, the object will :
- sink
- expand
- float
- contract
Which of the following is true about dissolving:
- Dissolving is an example of a reversible change.
- Dissolving is an example of a irreversible change.
- It depends on the conditions of dissolution.
- None of the above.
Railway tracks have gaps between them to deal with expansion in :
- hot days
- cold days
- winters
- snow fall
Heating will produce what sort of change?
- An irreversible change
- A reversible change
- Either a reversible or irreversible change
- Neither a reversible or irreversible change
What is a reversible change?
- A material changes permanently into a new material
- A material changes its feel or appearance, but it is still the same material
- A material changes into a new material, but it can be changed back
- A material stops existing
The change of state of water from one form to another is :
- chemical change
- irreversible change
- reversible change
- state variation
Consider the expansion and contraction among solids, liquids and gases, the one which has a greater tendency to expand is :
- solid
- liquid
- gas
- none of these
Brown colour of the apple after cutting is:
- physical change
- biological change
- chemical change
- no change
Heat gain makes ice to:
- freeze
- evaporate
- melt
- dissolve
Which of the following is/are different ways to bring a change?
- Expansion
- Contraction
- Evaporation
- All of the above.
What are the different conditions for a chemical reaction to take place?
- Heating
- Mixing
- Boiling
- All of the above
In the tools which are used to dig the soil, the iron blade in these tools fixed to the wooden handle. Which of the following is used during the change?
- Expansion
- Contraction
- Both expansion and contraction.
- Neither expansion and contraction.
The iron blade has a ring in which the wooden handle is fixed. The ring is slightly smaller in size than the wooden handle.
The ring is heated . When the ring cools it _____ and tightly fits on the handle.
- contracts
- expands
- evaporates
- condenses