CBSE Class 4 Social Studies States Of Matter Worksheet

States of Matter

I) Fill in the blanks :

1. All matter is made up of very tiny particles called molecules.
Answer: molecules
In simple words: Everything around us is built of tiny building blocks called molecules.

Exam Tip: Remember that molecules are the fundamental units of matter.

2. The empty space between the molecules is called intermolecular space.
Answer: intermolecular space
In simple words: The gap or distance present between individual molecules is known as intermolecular space.

Exam Tip: Use the precise scientific term 'intermolecular space'.

3. Anything which keeps its shape when left alone is called solid.
Answer: solid
In simple words: Solids have a fixed shape and do not change on their own.

Exam Tip: Solids possess a definite shape and volume.

4. Anything that has weight and occupies space is called matter.
Answer: matter
In simple words: Any substance that has mass and takes up space is matter.

Exam Tip: This is the universal definition of matter.

5. A uniform mixture of solute and solvent is called solution.
Answer: solute, solvent
In simple words: When a solid dissolves completely in a liquid, it forms a clear solution.

Exam Tip: Solute dissolves in solvent to form a solution.

II) Choose the correct answer :
1. Matter exists in [Three/ Four] states .
(a) Three
(b) Four
Answer: (a) Three
Matter primarily exists in three states: solid, liquid, and gas.
In simple words: The three main forms of matter are solid, liquid, and gas.

Exam Tip: Standard school curriculum recognizes three primary states of matter.

2. Sugar which turns into charcoal due to heating is an example of [Physical Change/ Chemical Change].
(a) Physical Change
(b) Chemical Change
Answer: (b) Chemical Change
Heating sugar causes it to decompose into carbon and water vapor, forming an entirely new substance, which makes it a chemical change.
In simple words: Formation of new substances indicates a chemical change.

3. In gases the space between the molecules is [more/less].
(a) more
(b) less
Answer: (a) more
Gas molecules are widely separated with very large intermolecular spaces.
In simple words: Gas particles have huge gaps between them.

Exam Tip: Gases are highly compressible due to large intermolecular spaces.

4. In soda water [carbondioxide/oxygen] has been dissolved under pressure.
(a) carbondioxide
(b) oxygen
Answer: (a) carbondioxide
Carbon dioxide gas is dissolved under pressure in water to make fizzy drinks like soda water.
In simple words: Fizzy drinks contain dissolved carbon dioxide gas.

Exam Tip: Carbon dioxide creates the fizz in soft drinks.

5. Molecules in a solid [solid/liquid] are closely packed.
(a) solid
(b) liquid
Answer: (a) solid
Molecules in a solid are tightly held together by strong forces.
In simple words: Solid particles are packed very closely together.

Exam Tip: Tight packing prevents solids from changing shape easily.

III) Write True or False :

1. Air is mixture of several kinds of gases. [ ]
Answer: True
Air contains nitrogen, oxygen, argon, carbon dioxide, and other trace gases.
In simple words: Air is made of many gases mixed together.

Exam Tip: Air is a mixture, not a pure compound.

2. All the molecules are constantly moving. [ ]
Answer: True
Molecules in all states of matter possess kinetic energy and are in constant motion.
In simple words: Molecules never stay completely still.

Exam Tip: Even in solids, molecules vibrate in their fixed positions.

3. We can see our molecules with our naked eye. [ ]
Answer: False
Molecules are microscopic and extremely tiny; they cannot be seen without powerful microscopes.
In simple words: Molecules are too small to see with just our eyes.

Exam Tip: Atoms and molecules require specialized instruments to be observed.

4. Different things have different kinds of molecules. [ ]
Answer: True
Every unique substance is made of its own specific type of molecules.
In simple words: Water molecules are different from sugar molecules.

Exam Tip: The properties of a substance depend on its unique molecules.

IV) Name the following :
1. A liquid in which a solid dissolves. ______________________________
Answer: Solvent
In simple words: The liquid that does the dissolving is called a solvent.

Exam Tip: Water is the most common universal solvent.

2. A solid substance which dissolves in a liquid _____________________
Answer: Solute
In simple words: The solid substance that gets dissolved is called a solute.

Exam Tip: Solute plus solvent equals solution.

Evaporation

I) Fill in the blanks :

1. The heat of the _________________________________dries up the puddle.
Answer: sun
In simple words: Sun warmth causes puddles to dry up.

Exam Tip: Solar heat drives natural evaporation.

2. _____________________is a process in which water changes to water vapour due to heat.
Answer: Evaporation
In simple words: Liquid water turns into gas when heated.

Exam Tip: Evaporation turns water into water vapor.

3. __________________is a process in which water vapour changes to water due to cooling.
Answer: Condensation
In simple words: Cooling water vapor turns it back into liquid droplets.

Exam Tip: Condensation is the reverse of evaporation.

4. __________________ is taking place in nature all the time.
Answer: Evaporation
In simple words: Water from oceans and rivers evaporates continuously.

Exam Tip: Evaporation is a continuous natural phenomenon.

5. ____________________cools down to form tiny drops of water.
Answer: Water vapour
In simple words: Water vapor forms droplets when it cools.

II) Choose the correct answer :

1. The heat of the sun dries up the puddle because of (evaporation / condensation)
(a) evaporation
(b) condensation
Answer: (a) evaporation
Heat converts liquid water into vapor, removing the puddle.
In simple words: Solar heat causes evaporation.

Exam Tip: Heat causes evaporation.

2. Water vapour cools down to form tiny drops of water. This process is (condensation/ evaporation)
(a) condensation
(b) evaporation
Answer: (a) condensation
Cooling water vapor results in condensation.
In simple words: Cooling turns vapor into liquid drops.

Exam Tip: Cooling causes condensation.

III) Write True or False :
1. The clothes in the sunlight dry up faster due to the heat of the sunlight.
Answer: True
Sunlight speeds up the evaporation of water from wet clothes.
In simple words: Sun heat dries clothes quickly.

Exam Tip: Higher temperature increases evaporation rate.

2. Puddle dry up because of evaporation of water.
Answer: True
Water in puddles turns into vapor and mixes with air.
In simple words: Puddle water evaporates into the air.

Exam Tip: Puddles disappear due to evaporation.

Where Do Babies Come From?

I . Fill in the blanks:
1. The process by which living beings produce their own kind is called___________________.
Answer: reproduction
In simple words: Making babies of their own kind is reproduction.

Exam Tip: Reproduction ensures the survival of species.

2. Animals that give birth to young ones are called______________________________.
Answer: mammals (or viviparous animals)
In simple words: Animals that give birth directly are mammals.

Exam Tip: Viviparous animals give birth to developed young ones.

3. A bird lives in a___________________________________.
Answer: nest
In simple words: Birds build nests to lay eggs.

Exam Tip: Nests provide safe shelter for bird eggs and chicks.

4. Animals that lay eggs are called _____________________.
Answer: oviparous animals
In simple words: Egg-laying animals are oviparous.

Exam Tip: Birds, reptiles, and amphibians are oviparous.

5. Only birds and mammals display a great sense of _______________________ care.
Answer: parental
In simple words: Birds and mammals look after their babies very well.

Exam Tip: Parental care ensures high survival rates for young ones.

6. All ____________________ produce young ones of their own kind.
Answer: living beings
In simple words: All living things reproduce.

Exam Tip: Reproduction is a defining characteristic of life.

7. ________________________ a child means to become legal parents of that child.
Answer: Adopting
In simple words: Taking someone else's child as your own legally is adoption.

Exam Tip: Adoption gives children a loving family and legal rights.

8. All ______________________ lay eggs which have hard brittle shells.
Answer: birds
In simple words: Bird eggs have hard shells.

Exam Tip: Hard shells protect the developing chick inside.

9. The young ones of mammals develop ______________________ the mother's body.
Answer: inside
In simple words: Mammal babies grow inside the mother.

Exam Tip: Gestation occurs inside the mother's womb.

10. ____________________________ are those who take another's child in to their home for a period of time, without becoming his own or her legal parents.
Answer: Foster parents
In simple words: Temporary care providers are foster parents.

II. Write True or False:-

1. The young ones of mammals develop inside the mother's body . ( )
Answer: True
Mammal embryos grow safely inside the mother.
In simple words: Mammal babies grow inside.

Exam Tip: This is a key feature of mammals.

2. The whale and dolphins which live in water are mammals. ( )
Answer: True
Whales and dolphins breathe air and give birth to live young.
In simple words: Whales and dolphins are water-dwelling mammals.

Exam Tip: Aquatic mammals give birth to live young ones.

3. Fishes, frogs and reptiles care for their young ones. ( )
Answer: False
Most fish, frogs, and reptiles lay eggs and leave them without parental care.
In simple words: These animals usually do not look after their babies.

4. Pigeon is a viviparous animal. ( )
Answer: False
Pigeons are birds and lay eggs, making them oviparous.
In simple words: Pigeons lay eggs, so they are oviparous.

Exam Tip: Birds are oviparous, not viviparous.

5. All birds lay eggs which have soft shells. ( )
Answer: False
Bird eggs have hard, brittle shells.
In simple words: Bird eggshells are hard.

Exam Tip: Hard shells protect bird eggs from breaking.

6. The mammals and birds take much care of their young ones. ( )
Answer: True
Both birds and mammals feed and protect their offspring.
In simple words: Birds and mammals protect their babies well.

Exam Tip: Strong parental care is characteristic of birds and mammals.

III. Name the following

1. Animals that give birth to young ones. __________________________
Answer: Viviparous animals (Mammals)
In simple words: Animals giving birth directly are viviparous.

Exam Tip: Cows, dogs, and humans are examples.

2. Animals that lay eggs. _________________________
Answer: Oviparous animals
In simple words: Animals that lay eggs are oviparous.

Exam Tip: Birds, snakes, and frogs are examples.

3. The process by which living beings produce their own kind. ________________________
Answer: Reproduction
In simple words: Making offspring is reproduction.

Exam Tip: Essential biological process for life continuation.

IV. Match the following:-

1. Human beings - a. Puppy
2. Cow - b. oviparous animal
3. Dog - c. Viviparous animals
4. Birds - d. Calf
Answer: 1-c, 2-d, 3-a, 4-b
In simple words: Match each animal with its young one or group type.

Exam Tip: Learn young ones and birth types for animals.

Our Sense Organs

Fill in the blanks :

1. Blind people can read with the help of the _______________________script.
Answer: Braille
In simple words: Blind individuals read using Braille script.

Exam Tip: Braille uses raised dot patterns.

2. Blind people read by using their ____________________ over raised dots.
Answer: fingers
In simple words: Fingers feel the raised dots to read.

Exam Tip: Tactile sense replaces vision in reading Braille.

3. We should not touch or play with _____________________ things.
Answer: sharp / electrical
In simple words: Avoid playing with dangerous objects.

Exam Tip: Safety first prevents accidental injuries.

4. We should not make fun of people who are ____________________.
Answer: differently abled
In simple words: Always respect differently abled individuals.

Exam Tip: Empathy and kindness are essential values.

5. Braille script is a system which use _________________________.
Answer: raised dots
In simple words: Braille is based on bump patterns.

Exam Tip: Invented by Louis Braille.

6. Children have about ________________ taste buds.
Answer: 10,000
In simple words: Kids have around 10,000 taste buds.

Exam Tip: Taste buds decrease in number as people grow older.

Write True or False :

1. We have six sense organs. [ ]
Answer: False
We have five sense organs: eyes, ears, nose, tongue, and skin.
In simple words: We have five main senses.

Exam Tip: Memorize the five sense organs.

2. We should make fun of people who are differently abled. [ ]
Answer: False
We must respect and help everyone.
In simple words: Never mock anyone.

Exam Tip: Respecting others is good manners.

3. We should touch or play with sharp things.[ ]
Answer: False
Sharp objects can cause cuts and injuries.
In simple words: Stay away from sharp tools.

4. Children have about 10,000 taste buds. [ ]
Answer: True
Children possess approximately 10,000 taste buds on their tongue and mouth.
In simple words: Kids have 10,000 taste buds.

Exam Tip: This explains why children are often sensitive to strong tastes.

Teeth

Fill in the blanks :-

1. Milk teeth are also called _________________________________ teeth.
Answer: temporary
In simple words: Temporary teeth are also known as milk teeth.

Exam Tip: Milk teeth fall out and are replaced by permanent teeth.

2. A full set of adult teeth consists of __________________________ teeth.
Answer: 32
In simple words: Adults have 32 teeth in total.

Exam Tip: 16 teeth in the upper jaw and 16 in the lower jaw.

3. The portion of the tooth seen above the gum is called the ____________________________.
Answer: crown
In simple words: The visible part of the tooth is the crown.

Exam Tip: Parts of a tooth are crown, neck, and root.

4. Caries is caused by the action of ____________________________.
Answer: bacteria
In simple words: Bacteria cause tooth decay.

Exam Tip: Bacteria produce acids that erode tooth enamel.

5. _____________________________ help us to speak clearly.
Answer: Teeth
In simple words: Teeth help in clear speech and pronunciation.

Exam Tip: Teeth support lips and tongue during speech.

6. _____________________________ helps us to taste food.
Answer: Tongue
In simple words: The tongue has taste buds for tasting food.

Exam Tip: Tongue is a muscular sense organ.

7. The inside of the tooth is ________________________________.
Answer: pulp
In simple words: The soft inner core is the pulp.

Exam Tip: Pulp contains nerves and blood vessels.

8. Some people wear a ________________________________ to make crooked teeth straight.
Answer: brace
In simple words: Braces straighten misaligned teeth.

Exam Tip: Orthodontic braces correct teeth alignment.

9. _____________________________ is the hardest substance in our body.
Answer: Enamel
In simple words: Tooth enamel is the hardest material in human bodies.

Exam Tip: Enamel protects the inner layers of teeth.

10. The doctor who looks after our teeth is called a _________________________________.
Answer: dentist
In simple words: Dentists treat dental problems.

Exam Tip: Visit a dentist twice a year for check-ups.

11. Tooth decay makes the mouth smell _____________________________.
Answer: foul / bad
In simple words: Bad breath is caused by tooth decay.

Exam Tip: Regular brushing prevents bad breath.

12. The teeth which help to cut and tear food are _____________________________.
Answer: incisors and canines
In simple words: Cutting and tearing are done by front and canine teeth.

II. Name the following :-

1. Three parts of a tooth
Crown, Neck, Root
Answer: Crown, Neck, Root
In simple words: The three main regions of a tooth are crown, neck, and root.

Exam Tip: Learn the anatomical structure of teeth.

3. The four main types of teeth
Incisors, Canines, Premolars, Molars
Answer: Incisors, Canines, Premolars, Molars
In simple words: Four kinds of teeth help us eat different foods.

Exam Tip: Each type has a specific chewing function.

How We Get Food

Fill in the blanks :

1. _____________________ is known as the 'land of spices'.
Answer: India
In simple words: India is famous for growing many spices.

Exam Tip: India exports spices worldwide.

2. ____________________ grow food.
Answer: Farmers
In simple words: Farmers grow crops for everyone.

Exam Tip: Agriculture is vital for human survival.

3. ___________________ catch fish.
Answer: Fishermen
In simple words: Fishermen catch fish from water bodies.

Exam Tip: Fishing is a major occupation near coasts.

4. Dairy workers gather _______________________.
Answer: milk
In simple words: Dairy workers collect milk from cattle.

Exam Tip: Milk is processed into curd, cheese, and butter.

5. Spices add ______________________ to our food.
Answer: flavor and taste
In simple words: Spices make food tasty and aromatic.

Exam Tip: Spices like pepper, cardamom, and cloves add rich flavor.

6. _______________________ are unwanted plants.
Answer: Weeds
In simple words: Weeds grow uninvited among crops.

Exam Tip: Weeds steal nutrients from main crops.

Water Sources

Fill in the blanks :

1. ____________________________ is the ultimate source of water on earth.
Answer: Rain
In simple words: Rain provides all fresh water on Earth.

Exam Tip: Rain is the primary source of the water cycle.

2. Rain water that seeps into the earth is known as _____________ water.
Answer: underground
In simple words: Water stored under the ground is groundwater.

Exam Tip: Accessed via wells, tube wells, and hand pumps.

3. ___________________ at the bottom of the well help to filter the water.
Answer: Gravel and sand
In simple words: Sand and pebbles naturally clean well water.

Exam Tip: Natural layers act as physical water filters.

4. ____________________ is the only kind of water which can be used for drinking.
Answer: Potable (or clean/filtered) water
In simple words: Only purified water is safe to drink.

5. A small collection of water is called a _________________.
Answer: pond
In simple words: Ponds are small water bodies.

Exam Tip: Ponds are smaller than lakes and seas.

6. ____________________ uses electricity to draw out underground water.
Answer: Tube well
In simple words: Electric pumps run tube wells.

Exam Tip: Tube wells pump out deep groundwater.

How Water Gets Dirty

Fill in the blanks :

1. We should always drink ____________________________ water.
Answer: clean / boiled / filtered
In simple words: Drink purified water to stay healthy.

Exam Tip: Boiling kills harmful germs in water.

2. ORS stands for ___________________________.
Answer: Oral Rehydration Solution
In simple words: ORS restores lost body salts and water.

Exam Tip: Essential treatment for dehydration and diarrhea.

3. A large mass of water is called ______________________________.
Answer: sea / ocean
In simple words: Oceans and seas contain huge water masses.

Exam Tip: Oceans cover most of the Earth's surface.

4. _____________________________ is the holiest river of the Hindus.
Answer: Ganga
In simple words: River Ganga is considered sacred in India.

Exam Tip: Ganga originates from the Himalayas.

5. Sea water is ________________________________.
Answer: saline / salty
In simple words: Ocean water contains lots of salt.

Exam Tip: Saline water is unfit for drinking without desalination.

How They Learnt Their Skills?

Fill in the blanks :

1. A __________________________ stitches clothes.
Answer: tailor
In simple words: Tailors stitch garments.

Exam Tip: Tailors use sewing machines and needles.

2. A ___________________________ mends shoes.
Answer: cobbler
In simple words: Cobblers repair footwear.

Exam Tip: Cobblers use awls, wax thread, and hammers.

3. A ___________________________ makes furniture.
Answer: carpenter
Answer: carpenter
In simple words: Carpenters build wooden items.

Exam Tip: Carpenters use saws, planes, and drills.

4. ITI stands for ________________________.
Answer: Industrial Training Institute
In simple words: ITI provides vocational technical training.

Exam Tip: ITIs teach practical trade skills.

Paying For Travel

I. FILL IN THE BLANKS

1. The study of coins is known as _____________________
Answer: numismatics
In simple words: Collecting and studying coins is numismatics.

Exam Tip: Numismatics helps us understand ancient history.

2. _______________________ person's photo is found on our currency notes.
Answer: Mahatma Gandhi
In simple words: Indian currency notes feature Mahatma Gandhi.

Exam Tip: Father of the Nation portrait is on Indian rupee notes.

3. Coins and notes contain our __________________________.
Answer: national currency / symbol
In simple words: Currency represents national money.

Exam Tip: Currency is issued by the Reserve Bank of India.

4. River Mandovi is in _____________________.
Answer: Goa
In simple words: Mandovi is a major river in Goa.

Exam Tip: Goa is famous for its beaches and rivers.

5. Full name of Mahatma Gandhi is ________________________.
Answer: Mohandas Karamchand Gandhi
In simple words: His full name is Mohandas Karamchand Gandhi.

Exam Tip: Remember his full name for general knowledge questions.

6. __________________________ is written below the National Emblem.
Answer: Satyameva Jayate
In simple words: Truth alone triumphs is inscribed below the emblem.

Exam Tip: Taken from the Mundaka Upanishad in Devanagari script.

7. The National Emblem has been taken from the lion capital at ______________.
Answer: Sarnath
In simple words: Our national emblem comes from Sarnath pillar.

Exam Tip: The pillar was built by Emperor Ashoka.

8. Mahatma Gandhi was born on _______________________.
Answer: 2nd October 1869
In simple words: Gandhi Jayanti is celebrated on October 2nd.

Exam Tip: National holiday in India.

9. The _______________________ sides of a coin are not the same.
Answer: two (obverse and reverse)
In simple words: Both sides of a coin have different designs.

Exam Tip: One side has value/emblem, other has motifs.

10. The capital of India is __________________.
Answer: New Delhi
In simple words: New Delhi is the national capital.

Exam Tip: Center of the Indian government.

Parts of a Plant

Fill in the blanks :

1. The ____________________ system of the plant grows above the ground.
Answer: shoot
In simple words: The part above ground is the shoot system.

Exam Tip: Shoot includes stem, leaves, flowers, and fruits.

2. The _____________________ system grows below the ground.
Answer: root
In simple words: Roots grow underground.

Exam Tip: Roots absorb water and minerals from soil.

3. __________________________ binds the particles of soil.
Answer: Root
In simple words: Roots hold soil firmly together.

Exam Tip: Prevents soil erosion caused by wind and water.

4. During the time of famine, people eat a root called ________________________.
Answer: tapioca / cassava / sweet potato
In simple words: Edible roots provide food during scarcity.

Exam Tip: Root vegetables store food for plants and humans.

5. ________________________ is best soil for plant growth.
Answer: Loam (loamy soil)
In simple words: Loamy soil is ideal for growing healthy plants.

Exam Tip: Loam contains a balanced mix of sand, silt, and clay.

Flowers

I. Fill in the blanks :

1. A ________________ is the most beautiful part of a plant.
Answer: flower
In simple words: Flowers are the colorful parts of plants.

Exam Tip: Flowers develop into fruits and seeds.

2. The transfer of pollen from the stamen to the stigma is called _____________________.
Answer: pollination
In simple words: Moving pollen grain to stigma is pollination.

Exam Tip: Essential for plant fertilization and seed production.

3. A bee keeping establishment is called an ______________.
Answer: apiary
In simple words: Places where bees are raised are apiaries.

Exam Tip: Apiculture is the rearing of honeybees.

4. Flowers have bright colours to attract _______________.
Answer: pollinators (insects / butterflies / bees)
In simple words: Bright petals attract insects.

Exam Tip: Insects aid in pollination.

5. Flowers have a sweet tasting liquid called _____________.
Answer: nectar
In simple words: Bees collect sweet nectar from flowers to make honey.

Exam Tip: Nectar is produced by nectaries in flowers.

Where Animals Live

I. Name the following groups of animals:

1. Animals which live on land ( )
Answer: Terrestrial animals
In simple words: Land animals are terrestrial.

Exam Tip: Examples include lions, cows, and elephants.

2. Animals which live in water ( )
Answer: Aquatic animals
In simple words: Water-dwelling animals are aquatic.

Exam Tip: Examples include fish, whales, and sharks.

3. Animals which spend most of their time on trees ( )
Answer: Arboreal animals
In simple words: Tree-dwelling animals are arboreal.

Exam Tip: Examples include monkeys and squirrels.

4. Animals that fly in air ( )
Answer: Aerial animals
In simple words: Flying animals are aerial.

Exam Tip: Examples include birds and bats.

5. Animals that can live on land as well as in water ( )
Answer: Amphibians
In simple words: Dual-habitat animals are amphibians.

Exam Tip: Frogs and salamanders are common amphibians.

Work, Force and Energy

I) Fill in the blanks :

1. ______________________energy is the cheapest form of energy.
Answer: Solar
In simple words: Sunlight is free and abundant solar energy.

Exam Tip: Solar energy is a renewable energy source.

2. Work is done when an object _________________.
Answer: moves (is displaced)
In simple words: Motion caused by force is scientific work.

Exam Tip: Work requires both force and movement.

3. A moving football comes to a stop after sometime because of the force of ______________________
Answer: friction
In simple words: Friction stops rolling balls.

Exam Tip: Friction is a resistive contact force.

4. Force changes the ________________ of a moving body.
Answer: speed or direction (or shape)
In simple words: Force can speed up, slow down, or turn objects.

Exam Tip: Force alters the state of motion.

5. When you play or jump you make use of ______________ energy.
Answer: muscular
In simple words: Muscles provide energy for body movements.

Exam Tip: Muscular energy comes from digested food.

6. Electrical gadgets work with the help of ______________ energy.
Answer: electrical
In simple words: Electricity powers electrical appliances.

Exam Tip: Electrical energy converts to light, heat, or mechanical energy.

7. The force that pulls everything towards the earth is called ___________.
Answer: gravity
In simple words: Gravity pulls objects downward.

Exam Tip: Discovered by Sir Isaac Newton.

8. An atom is the smallest particle of _________________.
Answer: matter (or an element)
In simple words: Atoms are building blocks of elements.

Exam Tip: Atoms combine to form molecules.

9. When a force moves some object through some distance, it is called _______________.
Answer: work
In simple words: Moving an object with force is doing work.

Exam Tip: Work = Force \times Displacement.

10. A ________ is a tool or an apparatus which helps us to do work by applying lesser force.
Answer: simple machine
In simple words: Simple machines make tasks easier.

Exam Tip: Examples include levers, pulleys, and inclined planes.

11. Wind mill uses _________________ energy.
Answer: wind
In simple words: Windmills harness moving air energy.

Exam Tip: Wind energy is clean and renewable.

12. The capacity to do work is called _________________.
Answer: energy
In simple words: Energy is the ability to perform work.

13. Pushes and pulls are called ___________________.
Answer: force
In simple words: A push or pull is a force.

Exam Tip: Force is an external push or pull acting on a body.

Stars And Planets

I) Name the following:

1. Scientist who study stars with the help of telescopes____________
Answer: Astronomer
In simple words: Scientists studying space are astronomers.

Exam Tip: Astronomers explore stars, planets, and galaxies.

2. India's First satellite ________________________________
Answer: Aryabhatta
In simple words: India's first space satellite was named Aryabhatta.

3. Three main layers of the Earth.
a) Crust b) Mantle c) Core
Answer: Crust, Mantle, Core
In simple words: Earth has three inner layers: crust, mantle, and core.

Exam Tip: Core is the hottest innermost layer.

4. Movements of the Earth
a) Rotation b) Revolution
Answer: Rotation, Revolution
In simple words: Earth spins on its axis (rotation) and moves around the sun (revolution).

Exam Tip: Rotation causes day and night; revolution causes seasons.

5. Earth's natural satellite _________________________
Answer: Moon
In simple words: The Moon is Earth's only natural satellite.

Exam Tip: Reflects sunlight toward Earth at night.

6. The biggest planet in the solar system__________________
Answer: Jupiter
In simple words: Jupiter is the largest planet.

Exam Tip: Gas giant with a Great Red Spot.

Please refer to attached file for CBSE Class 4 Social Studies Worksheet