6th std Tamil Medium Science Unit -3 Changes Around Us Lesson:-
Multiple Choice Questions (MCQs) – 25 Questions with Answers:
Which of the following is a natural change? a) Cutting a tree
b) Seasons changing
c) Making a car
d) Cooking food
Answer: b) Seasons changing
Which of the following is a reversible change? a) Burning of paper
b) Melting of ice
c) Rusting of iron
d) Cooking food
Answer: b) Melting of ice
Which of the following is a chemical change? a) Dissolving salt in water
b) Boiling water
c) Burning wood
d) Freezing water
Answer: c) Burning wood
Which of the following is an example of a physical change? a) Rusting of iron
b) Burning of paper
c) Tearing a paper
d) Cooking food
Answer: c) Tearing a paper
Which of the following happens during a chemical change? a) No new substances are formed
b) New substances are formed
c) The material can be reversed
d) The temperature does not change
Answer: b) New substances are formed
What is the result of freezing water? a) Chemical change
b) Reversible physical change
c) Irreversible physical change
d) None of the above
Answer: b) Reversible physical change
Which of the following is a reversible change? a) Burning wood
b) Freezing water
c) Cooking rice
d) Rusting of iron
Answer: b) Freezing water
Which of the following is an example of a reversible change? a) Melting of wax
b) Burning of coal
c) Rusting of iron
d) Cooking food
Answer: a) Melting of wax
Which of the following is caused by a chemical change? a) Boiling of water
b) Formation of a new color
c) Freezing of water
d) Tearing of paper
Answer: b) Formation of a new color
Which of the following is an example of a non-reversible change? a) Boiling water
b) Melting ice
c) Burning wood
d) Freezing juice
Answer: c) Burning wood
What happens when food is cooked? a) A physical change occurs
b) A chemical change occurs
c) No change occurs
d) A reversible change occurs
Answer: b) A chemical change occurs
Which change is not caused by heat? a) Melting of ice
b) Boiling of water
c) Freezing of water
d) Burning of paper
Answer: c) Freezing of water
The change that cannot be reversed is called a: a) Physical change
b) Reversible change
c) Irreversible change
d) Natural change
Answer: c) Irreversible change
What kind of change occurs when a metal rusts? a) Physical change
b) Reversible change
c) Chemical change
d) Both reversible and irreversible
Answer: c) Chemical change
Which of the following changes is permanent? a) Freezing water
b) Tearing paper
c) Rusting of iron
d) Boiling milk
Answer: c) Rusting of iron
Which of the following is not a change in matter? a) Changing the shape of a paper
b) Freezing water
c) Burning a candle
d) Changing the color of a flower
Answer: a) Changing the shape of a paper
What happens when an egg is boiled? a) No change
b) Physical change
c) Chemical change
d) Both physical and chemical changes
Answer: c) Chemical change
Which of the following changes can be reversed? a) Breaking a glass
b) Melting ice
c) Cooking food
d) Rusting of iron
Answer: b) Melting ice
Which of the following is caused by a physical change? a) Making tea
b) Burning a candle
c) Dissolving salt in water
d) Growing of a plant
Answer: c) Dissolving salt in water
What kind of change occurs when paper is torn? a) Chemical change
b) Physical change
c) Reversible change
d) Irreversible change
Answer: b) Physical change
Which of the following changes is an irreversible change? a) Freezing water
b) Mixing sand with salt
c) Cutting a piece of wood
d) Burning paper
Answer: d) Burning paper
Which of the following is a natural change? a) Growth of plants
b) Cooking food
c) Boiling water
d) Breaking a glass
Answer: a) Growth of plants
Which of the following involves a change in state of matter? a) Dissolving salt in water
b) Melting of ice
c) Tearing paper
d) Rusting of iron
Answer: b) Melting of ice
What happens when a candle is lit? a) Physical change
b) Chemical change
c) Both physical and chemical changes
d) No change
Answer: c) Both physical and chemical changes
Which of the following changes can be reversed? a) Burning a matchstick
b) Freezing water
c) Cooking food
d) Crushing a can
Answer: b) Freezing water
Fill in the Blanks – 25 Questions with Answers:
A change that can be reversed is called a ___________ change.
Answer: reversible
Burning of paper is an example of a ___________ change.
Answer: chemical
The ___________ of ice is a reversible change.
Answer: melting
Water turning into ice is an example of a ___________ change.
Answer: physical
Rusting of iron is an example of a ___________ change.
Answer: chemical
Cutting a piece of paper is a ___________ change.
Answer: physical
The change in the ___________ of a fruit as it ripens is a chemical change.
Answer: color
Cooking rice is an example of a ___________ change.
Answer: chemical
Melting of chocolate is an example of a ___________ change.
Answer: physical
The burning of wood causes a ___________ change.
Answer: chemical
The process of ___________ is a reversible change.
Answer: freezing
A ___________ change results in the formation of a new substance.
Answer: chemical
The boiling of water is a ___________ change.
Answer: physical
___________ is a process that involves both physical and chemical changes.
Answer: Cooking food
A chemical change always results in the formation of a ___________ substance.
Answer: new
The ___________ of a balloon is a physical change.
Answer: inflating
Cutting a piece of wood is an example of a ___________ change.
Answer: physical
___________ of metal is an irreversible change.
Answer: Rusting
The dissolving of sugar in tea is a ___________ change.
Answer: physical
Freezing of water is a ___________ change.
Answer: physical
The changing of a leaf's color in autumn is a ___________ change.
Answer: chemical
The cooking of an egg is an example of a ___________ change.
Answer: chemical
___________ of a piece of iron forms rust, which is an irreversible change.
Answer: Oxidation
The tearing of paper is an example of a ___________ change.
Answer: physical
The burning of fuel in a car engine is an example of a ___________ change.
Answer: chemical
Match the Following – 10 Questions with Answers:
Column A
Melting of ice
Burning of wood
Tearing of paper
Boiling of water
Freezing of water
Rusting of iron
Cooking food
Melting of chocolate
Dissolving sugar in tea
Growing of plants
Column B
a) Chemical change
b) Physical change
c) Physical change
d) Irreversible change
e) Chemical change
f) Reversible change
g) Reversible change
h) Chemical change
i) Reversible change
j) Natural change
Answers
1 - f) Reversible change
2 - e) Chemical change
3 - b) Physical change
4 - b) Physical change
5 - f) Reversible change
6 - a) Chemical change
7 - e) Chemical change
8 - g) Reversible change
9 - b) Physical change
10 - j) Natural change
Questions and Answers – 20 Questions with Answers:
What is the difference between reversible and irreversible change?
Answer: Reversible changes can be undone, while irreversible changes cannot be undone.
Is boiling water a physical change or a chemical change?
Answer: Boiling water is a physical change.
What happens when iron rusts?
Answer: Rusting is a chemical change where iron reacts with oxygen to form iron oxide.
What is an example of a reversible physical change?
Answer: Melting of ice is a reversible physical change.
What is a chemical change?
Answer: A chemical change is when a new substance is formed, and the original substance cannot be recovered.
Is cooking food a physical or chemical change?
Answer: Cooking food is a chemical change.
What happens when water freezes?
Answer: Freezing water is a physical change where water changes from a liquid to a solid.
Can you reverse the burning of paper?
Answer: No, burning paper is an irreversible chemical change.
What happens during a chemical change?
Answer: New substances are formed, and the change is usually irreversible.
Is melting chocolate a reversible change?
Answer: Yes, melting chocolate is a reversible physical change.
What is an example of a physical change?
Answer: Tearing a piece of paper is a physical change.
Why is rusting considered an irreversible change?
Answer: Rusting changes the composition of iron, and it cannot return to its original state.
What type of change occurs when an egg is boiled?
Answer: A chemical change occurs when an egg is boiled.
What change occurs when salt dissolves in water?
Answer: This is a physical change.
What is an example of a natural change?
Answer: Growth of plants is a natural change.
What happens when a leaf changes color in autumn?
Answer: This is a chemical change as the pigments in the leaf break down.
What kind of change occurs when you make tea?
Answer: Making tea involves both physical and chemical changes.
Is freezing water a reversible change?
Answer: Yes, freezing water is a reversible physical change.
Is tearing paper an irreversible change?
Answer: No, tearing paper is a reversible physical change.
What type of change is the cooking of an egg?
Answer: The cooking of an egg is a chemical change.
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