Changes Around Us

The process in which liquid changes into vapour on heating is?
1. evaporation
2. melting
3. condensation
4. None
The process in which solid changes into liquid on heating is
1. evaporation
2. melting
3. condensation
4. freezing
The process in which gas changes into a liquid is
1. evaporation
2. melting
3. condensation
4. freezing
The process in which liquid changes into solid is
1. evaporation
2. melting
3. freezing
4. Fusion
The changes in which only physical properties of a substance undergo a change
1. Physical change
2. Chemical change
3. Both A & B
4. None
Melting, vaporization, and sublimation occur when heated and hence it is called as _________ process
1. endothermic process
2. exothermic process
3. physical change
4. None
In contrast, such as in freezing and condensation, heat is removed, resulting in the decreasing the speed of the molecules causing them move slower. Such processes are called as
1. endothermic process
2. exothermic process
3. Vapourization
4. None
The process of conversion of a liquid into vapours on heating is?
1. Boiling
2. Melting
3. Freezing
4. evaporation
__________ is the changing of a gas into its liquid state and it happens by cooling
1. Condensation
2. Sublimation
3. Crystallization
4. None
This process in which a solid is converted directly into gas is called
1. Condensation
2. Sublimation
3. Crystallization
4. None
Solid substances are usually purified by the process of _____
1. crystallization
2. Sublimation
3. Condensation
4. None
The process in which liquid gradually turns into solid, forming clumps is?
1. Curdling
2. Fermentation
3. Rusting
4. None
The process in which microorganisms such as yeast and certain bacteria break down sugar solution into alcohol is?
and carbon-di-oxide
1. Fermentation
2. Curdling
3. Rusting
4. None
Changes that repeat themselves after a definite interval of time are called
1. Non-periodic changes
2. periodic changes
3. endothermic changes
4. exothermic changes
Changes that do not repeat themselves after a definite interval of time and occur
randomly are called
1. periodic changes
2. non-periodic changes
3. endothermic changes
4. exothermic changes
Changes in which heat is absorbed are known as ______ changes
1. periodic changes
2. non-periodic changes
3. endothermic changes
4. exothermic changes
Changes in which heat is released are known as _______ changes
1. periodic changes
2. non-periodic changes
3. endothermic changes
4. exothermic changes
Which of the following is a physical change?
1. Rusting of iron
2. Combustion of magnesium ribbon
3. Burning of candle
4. Melting of wax
Which of the following is a chemical change?
1. Cooking of vegetables
2. Cutting of fruits
3. Boiling of water
4. None
A chemical change may involve
1. change in colour only
2. change in temperature only
3. evolution of gas only
4. any or all of the above
Which of the following is/are true when milk changes into curd?
(i) Its state is changed from liquid to semi solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option from below :
1. (i) and (ii) are correct
2. (ii) and (iii) are correct
3. (i), (iii) and (iv) are correct
4. (i) to (iv) are correct
A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statement(s) is/are correct?
1. (i) and (ii)
2. (ii) and (iii)
3. only (ii)
4. (i) and (iii)
Galvanisation is a process used to prevent the rusting of which of the following?
1. Iron
2. ZInc
3. Aluminium
4. None
Which of the following statement is incorrect for a chemical reaction?
1. Heat may be given out but never absorbed.
2. Sound may be produced.
3. A colour change may take place.
4. A gas may be evolved.
When a woolen yarn is knitted to get a sweater, the change can be classified as_______ .
1. physical change
2. chemical change
3. endothermic change
4. exothermic change
___________ of the following are endothermic changes.
1. Condensation and melting
2. Condensation and freezing
3. Evaporation and melting
4. Evaporation and freezing
The chemical change is ____________ .
1. water to clouds
2. growth of a tree
3. cow dung to bio-gas.
4. ice-cream to molten ice-cream.
________is an example of a periodic change
1. Earthquake.
2. Formation of rainbow in sky
3. Occurrence of tides in seas.
4. Showering of rain
The melting of wax is an example of
1. physical change
2. chemical change
3. reversible change
4. Both (a) and (c)
Which of the following is a periodic change?
1. Change of season
2. Phases of moon
3. Beating of human heart
4. All of these

Changes Around Us

Quiz