Class 6 Science MCQ Changes Around Us

Question : Sea water is a

(a) Element
(b) Mixture
(c) Molecule
(d) Compound

Question :An example of a periodic change is :

(a) swinging of a clock pendulum
(b) landslides during rains
(c) rusting of iron
(d) sneezing

Question :During physical and chemical changes :

(a) energy is always absorbed
(b) energy is always released
(c) no energy is absorbed or released
(d) energy is either absorbed or released

Question :A change is an alteration in the physical and chemical properties of matter due to the effect of :

(a) light
(b) heat
(c) some kind of energy
(d) pressure

Question : Which one of the steps while burning a candle is not reversible?

(a) Melting of solid wax
(b) liquid wax changes into vapours
(c) Wax vapour bums into flame
(d) All of these

Question : Metal rim is made slightly than the wooden wheel.

(a) Bigger
(b) Smaller
(c) Equal
(d) None of these

Question : The change in which chemical properties of a substance change is called

(a) chemical change
(b) physical change
(c) heating
(d) pressure

Question : Rotation of fan blade is a

(a) Permanent change
(b) Undesirable change
(c) Non- periodic change
(d) Periodic change

Question : A process by which gas is turned into liquid is known as:

(a) Solution
(b) Fusion
(c) Condensation
(d) Evaporation

Question : Rusting of iron is an example of

(a) slow change
(b) fast change
(c) reversible change
(d) physical change

Question : In a chemical change

(a) Energy change do not occur
(b) Energy is either absorbed or given out
(c) Energy is always absorbed
(d) Energy is given out

Question : When a solid dissolves in liquid then is formed.

(a) Condensation
(b) Fusion
(c) Solution
(d) Evaporation

Question : Which of the following is an example of physical change?

(a) Boiling of water
(b) Ripening of fruit
(c) Rusting of iron
(d) A bud turning into flower

Question : Physical changes are

(a) temparary and can be reversed
(b) irreversible
(c) permanent
(d) temporary and irreversible

Question : Physical chemical changes are a result of absorption of :

(a) heat energy only
(b) light energy only
(c) sound energy only
(d) some kind of energy

Question :A chemical change involves :

(a) change of state only
(b) change of colour only
(c) change of state as well as composition
(d) None of these

Question :A physical change is a/an :

(a) temporary change
(b) permanent change
(c) irreversible change
(d) None of these

Question :An example of a physical change is:

(a) magnetisation of iron
(b) burning of wood
(c) photosynthesis by plants
(d) digestion of food

Question : Which of the following changes cannot be reversed?

(a) Milk to paneer
(b) Cold milk to hot milk
(c) Yam to knitted sweater
(d) Wet clothes to dry clothes

Question : If we burn a candle, the height of a candle will .

(a) Decreased
(b) Increased
(c) Remain same
(d) None of these

Question : A process in which an object becomes smaller or shrinks is called

(a) chemical change
(b) irreversible change
(c) contraction
(d) expansion

Question : The melting of gold is an example of:

(a) chemical change
(b) physical change
(c) chemical electrical
(d) physical magnetical

Question : Which of these is the smallest particle?

(a) A speck of dust
(b) An atom
(c) A water drop
(d) A molecule

Question: Physical chemical changes are a result of absorption of

(a) some kind of energy
(b) light energy only
(c) heat energy only
(d) sound energy only

Question : A chemical change involves

(a) change of state as well as composition
(b) change of state only
(c) change of colour only
(d) None of these

Question : Rusting of iron is an example of

(a) slow change
(b) fast change
(c) reversible change
(d) physical change

Question : The black material (tar) for repairing road is .

(a) Heated
(b) Cooled
(c) Heated and cooled
(d) None of these

Question : Which of the following is not a man-made change?

(a) Change of day and night
(b) Burning of fuels
(c) Drying of clothes
(d) Tearing of paper

Question : A physical change is a/an :

(a) permanent change
(b) irreversible change
(c) temporary change
(d) None of these

Question : An example of a physical change is

(a) digestion of food
(b) photosynthesis by plants
(c) burning of wood
(d) magnetisation of iron

Question : An example of an undesirable change is

(a) earthquake
(b) melting of snow on mountains
(c) evaporation of water
(d) flowering of plants

Question : An example of a periodic change is

(a) swinging of a clock pendulum
(b) rusting of iron
(c) landslides during rains
(d) sneezing

Question : During physical and chemical changes

(a) no energy is absorbed or released
(b) energy is always released
(c) energy is always absorbed
(d) energy is either absorbed or released

Question : A change is an alteration in the physical and chemical properties of matter due to the effect of :

(a) heat
(b) light
(c) some kind of energy
(d) pressure

Question : A change in a substance can be brought by heating it or by it with other substances.

(a) Cooling
(b) Boiling
(c) Washing
(d) Mixing

Question : Which is not a sign of reversible change?

(a) Change in state
(b) Change in property
(c) Change in size
(d) Change in appearance

Question : Melting of ice into water is a

(a) Exothermic change
(b) Physical change
(c) Permanent change
(d) Chemical change

Question : Which of the following is a chemical change?

(a) Evaporation of water
(b) Burning of fuels
(c) Moving of a wheel
(d) Breaking of a brick

Question : The change which cannot be reversed is known as:

(a) Reversible change
(b) Irreversible change
(c) Both (a) and (b)
(d) None of these

Question : A process in which liquid changes into vapour is called

(a) contraction
(b) evaporation
(c) melting
(d) freezing

Question : Melting of wax is

(a) chemical change
(b) physical change
(c) both of these
(d) none of these

Question : Melting of ice is a

(a) Both physical and chemical change
(b) Physical change
(c) Periodic change
(d) Chemical change