CG Board Class 6 Science Changes Around Us MCQ
If you are looking for CG Board Class 6 Science Changes Around Us MCQ then you are at right place.
In the conversion of water to steam and back to water, this type of change is called:
a) Irreversible change
b) Chemical change
c) Reversible change
d) Permanent change
Answer: c) Reversible change
Which of the following is a periodic (cyclic) change?
a) Falling of fruits from trees
b) Railway accidents
c) Change of seasons
d) Cyclones
Answer: c) Change of seasons
Rusting of iron is an example of:
a) Physical change only
b) Chemical change only
c) Both physical and chemical change
d) Neither physical nor chemical change
Answer: b) Chemical change only
Which of the following is NOT a characteristic of chemical changes?
a) New products are formed
b) Original substance can always be recovered
c) Chemical reactions occur between reactants
d) Most chemical changes are irreversible
Answer: b) Original substance can always be recovered
The process of pasteurization was first used by:
a) Thomas Edison
b) Louis Pasteur
c) Marie Curie
d) Alexander Fleming
Answer: b) Louis Pasteur
Which of the following is a desirable change?
a) Flooding of rivers
b) Formation of manure from cow-dung
c) Breaking of glass plate
d) Rusting of machine parts
Answer: b) Formation of manure from cow-dung
In a physical change:
a) New substance is formed
b) The change is always irreversible
c) No new substance is formed
d) Chemical properties are changed
Answer: c) No new substance is formed
The fermentation process is:
a) A physical change
b) A chemical change
c) Neither physical nor chemical
d) Both physical and chemical
Answer: b) A chemical change
The change of state from ice to water vapor involves:
a) Only chemical change
b) Only physical change
c) Both chemical and physical change
d) Neither chemical nor physical change
Answer: b) Only physical change
During fermentation, complex carbon compounds break down into:
a) More complex compounds
b) Simpler compounds
c) Same compounds
d) No breakdown occurs
Answer: b) Simpler compounds
In chemical reactions:
a) Only heat is absorbed
b) Only heat is released
c) Either heat is absorbed or released
d) No heat exchange takes place
Answer: c) Either heat is absorbed or released
Which of these is an irreversible change?
a) Stretching of rubber band
b) Melting of ice
c) Burning of paper
d) Dissolving salt in water
Answer: c) Burning of paper
The phase changes of the moon are an example of:
a) Fast change
b) Periodic change
c) Chemical change
d) Irreversible change
Answer: b) Periodic change
Which of these is NOT a physical change?
a) Tearing of paper
b) Mixing of salt with water
c) Burning of wood
d) Sublimation of ammonium chloride
Answer: c) Burning of wood
To prevent rusting of iron, we can:
a) Expose it to more air
b) Apply coats of zinc or paint
c) Keep it in water
d) Heat it regularly
Answer: b) Apply coats of zinc or paint
The conversion of milk into curd is:
a) A physical change
b) A reversible change
c) A chemical change
d) A periodic change
Answer: c) A chemical change
When chalk breaks into pieces, it is an example of:
a) Chemical change
b) Physical change
c) Both chemical and physical change
d) Neither chemical nor physical change
Answer: b) Physical change
In a chemical change:
a) Only physical properties change
b) The characteristics of reactants and products are same
c) New products are formed
d) All changes are reversible
Answer: c) New products are formed
The process of digestion is:
a) A physical change
b) A chemical change
c) Neither physical nor chemical
d) Both physical and chemical
Answer: b) A chemical change
When water is poured on limestone:
a) Heat is absorbed
b) Heat is released
c) No heat exchange occurs
d) First heat is absorbed then released
Answer: b) Heat is released
To protect foodgrains from insects, we can use:
a) More water
b) Insecticide tablets wrapped in cloth
c) Direct sunlight
d) Cold storage only
Answer: b) Insecticide tablets wrapped in cloth
The formation of vapor from water is:
a) Chemical change
b) Irreversible change
c) Physical change
d) Permanent change
Answer: c) Physical change
Which of these changes cannot be reversed?
a) Stretching of rubber band
b) Melting of wax
c) Growth of plant from seed
d) Formation of ice from water
Answer: c) Growth of plant from seed
