CBSE Class 5 Science Revision Worksheet Set 15

I Fill in the blanks:-

1. The brain gets its signals from various parts of the body through the ____________________

2. The __________ protects the brain from many dangers.

3. The nervous system consists of ____________, ____________ and ____________.

4. ____________ nerve carry visionary messages to the brain.

5. The _____________ forms the covering protecting the internal organs.

II Choose the correct answer:-

1. (Mixed Nerve / Motor Nerve) carry messages to the brain as well as carry orders from it.

2. (Cerebrum / Cerebellum) controls speech, memory and intelligence.

3. (Cerebellum / Medulla) connects the brain to the spinal cord.

4. (Pupil / Iris) is a circular diaphragm which gives the eye its colour.

5. (Cerebrum/Medulla) is the largest part of the brain.

III True Or False

1. The nerves are directly connected to the brain or spinal cord. 

2. The brain is divided into two halves.

3. The brain grows to its full size only when a person reaches his adult stage.

4. Cerebellum controls breathing and blood circulation.

5. The flavours of food is experienced by our taste receptors and smell receptors.

IV Name the following

1. The three kinds of nerves _____________, ____________, _________________

2. The organ which detects the sense of taste ___________________

3. Another name of taste receptors __________________

4. The sense organ which throws the waste water of the body as sweat ______________

5. The muscles that hold and control the shape of lens. ___________

Lesson – 7 Skeletal System (FA3 + SA2)

I Fill in the blanks

1. The muscles which are under our control are called _____________

2. The muscles which work automatically are called ______________

3. In the upper arm, there is a long bone called _________________

4. The other name of thigh bone is called _______________

5. Our face is made up of ____________ bones. 

II Name the following

1. Other name of backbone ________________

2. Two pairs of lower ribs which are not attached to breast bone. _____________

3. The point where two separate bones meet _______________

4. Tough tissues which bones are held together _______________

5. The muscles of heart __________________

6. The strong fibres by which the bones are held together _____________

7. The long curved bones that form the rib cage ________________

8. The framework of bones ________________

Lesson -8 Food and Health (only for FA3)

I Fill in the blanks

1. The diet which contains proper proportion of all important substances is called a _____________.

2. Deficiency or lack of particular mineral or vitamin causes _______________ diseases.

3. ___________ are single called micro organisms.

4. Vaccination was discovered by ____________________

5. Plaque is spread by _______________ that live on rats.

6. Typhus fever is carried by ___________ which lives on sick persons.

Please click the below link to access CBSE Class 5 Science -  Revision (2)

L-6 Nervous System (FA3 + SA2)

I. Fill in the blanks:-

Question 1. The brain gets its signals from various parts of the body through the ____________________
Answer: spinal cord and nerves
In simple words: Nerves and the spinal cord act as telephone wires carrying messages to and from the brain.

Exam Tip: Remember that nerves connect every part of the body to the central nervous system.

Question 2. The __________ protects the brain from many dangers.
Answer: skull
In simple words: The bony box called the skull keeps our delicate brain safe from bumps and injuries.

Exam Tip: Associate skull with protection of the brain, just like the ribcage protects the heart and lungs.

Question 3. The nervous system consists of ____________, ____________ and ____________.
Answer: brain, spinal cord, nerves
In simple words: The three main parts that make up our body's control center are the brain, spinal cord, and nerves.

Exam Tip: Learn these three components as the primary triad of the nervous system.

Question 4. ____________ nerve carry visionary messages to the brain.
Answer: Optic
In simple words: The optic nerve links our eyes to the brain so we can see images.

Exam Tip: 'Optic' relates to vision and eyes.

Question 5. The _____________ forms the covering protecting the internal organs.
Answer: skin
In simple words: Skin is our largest sense organ and acts as an outer shield.

Exam Tip: Skin also helps in excreting waste as sweat and regulating body temperature.

II. Choose the correct answer:-

Question 1. (Mixed Nerve / Motor Nerve) carry messages to the brain as well as carry orders from it.
Answer: Answer: (Mixed Nerve) carry messages to the brain as well as carry orders from it.
Mixed nerves perform two-way communication by transmitting sensory information to the brain and motor commands back to muscles.
In simple words: Mixed nerves are two-way streets for body signals.

Exam Tip: Sensory nerves carry signals to the brain; motor nerves carry orders away; mixed nerves do both.

Question 2. (Cerebrum / Cerebellum) controls speech, memory and intelligence.
Answer: Answer: (Cerebrum) controls speech, memory and intelligence.
The cerebrum is the largest part of the brain and is responsible for thinking, reasoning, memory, and speech.
In simple words: The cerebrum is our thinking cap.

Exam Tip: Link cerebrum with higher mental functions like intelligence and learning.

Question 3. (Cerebellum / Medulla) connects the brain to the spinal cord.
Answer: Answer: (Medulla) connects the brain to the spinal cord.
The medulla oblongata (brain stem) joins the brain to the spinal cord and controls involuntary actions like breathing.
In simple words: The medulla is the bridge between brain and spine.

Question 4. (Pupil / Iris) is a circular diaphragm which gives the eye its colour.
Answer: Answer: (Iris) is a circular diaphragm which gives the eye its colour.
The colored part of the eye that controls the amount of light entering through the pupil is the iris.
In simple words: Iris gives your eyes their blue, brown, or green color.

Exam Tip: Iris is the colored ring; the pupil is the dark opening in the center.

Question 5. (Cerebrum/Medulla) is the largest part of the brain.
Answer: Answer: (Cerebrum) is the largest part of the brain.
The cerebrum makes up the major portion of the human brain.
In simple words: Cerebrum is the biggest section of the brain.

Exam Tip: Memorize brain parts by size and function: Cerebrum (largest, thinking), Cerebellum (balance), Medulla (involuntary actions).

III. True Or False

Question 1. The nerves are directly connected to the brain or spinal cord.
Answer: True
In simple words: All nerves originate from or connect to either the brain or the spinal cord.

Exam Tip: The central nervous system consists strictly of the brain and spinal cord, branching out via nerves.

Question 2. The brain is divided into two halves.
Answer: True
In simple words: The cerebrum has a right hemisphere and a left hemisphere.

Exam Tip: The right hemisphere controls the left side of the body and vice versa.

Question 3. The brain grows to its full size only when a person reaches his adult stage.
Answer: False
In simple words: The brain reaches its full adult size and weight much earlier in childhood, around age 6 to 12.

Question 4. Cerebellum controls breathing and blood circulation.
Answer: False
In simple words: Breathing and blood circulation are controlled by the medulla, not the cerebellum.

Exam Tip: Cerebellum controls muscular coordination and body balance.

Question 5. The flavours of food is experienced by our taste receptors and smell receptors.
Answer: True
In simple words: Taste and smell work together to let us fully experience the flavor of food.

Exam Tip: When you have a cold and a stuffed nose, food tastes bland because smell receptors are blocked.

IV. Name the following

Question 1. The three kinds of nerves _____________, ____________, _________________
Answer: Sensory nerves, Motor nerves, Mixed nerves
In simple words: The three functional types of nerves in our body are sensory, motor, and mixed.

Question 2. The organ which detects the sense of taste ___________________
Answer: Tongue
In simple words: The tongue has taste buds that detect sweet, sour, salty, and bitter tastes.

Exam Tip: Tongue is the primary sense organ of taste.

Question 3. Another name of taste receptors __________________
Answer: Taste buds
In simple words: Tiny structures on the tongue surface called taste buds sense flavors.

Exam Tip: Taste buds contain nerve endings sensitive to chemical dissolved in saliva.

Question 4. The sense organ which throws the waste water of the body as sweat ______________
Answer: Skin
In simple words: Sweat glands in the skin remove extra water and salts from the body.

Question 5. The muscles that hold and control the shape of lens. ___________
Answer: Ciliary muscles
In simple words: Ciliary muscles adjust the eye lens shape to focus on near or distant objects.

Question 1. The muscles which are under our control are called _____________
Answer: Voluntary muscles
In simple words: Muscles that we can move whenever we want (like arm and leg muscles) are voluntary.

Question 2. The muscles which work automatically are called ______________
Answer: Involuntary muscles
In simple words: Muscles that work on their own without conscious control (like stomach and heart muscles) are involuntary.

Exam Tip: Also known as smooth or unstriped muscles (except cardiac muscle).

Question 3. In the upper arm, there is a long bone called _________________
Answer: Humerus
In simple words: The upper arm bone connecting shoulder to elbow is the humerus.

Exam Tip: Humerus is the single long bone of the upper arm.

Question 4. The other name of thigh bone is called _______________
Answer: Femur
In simple words: Femur is the longest and strongest bone in the human body, located in the thigh.

Exam Tip: Always remember femur is the longest bone.

Question 5. Our face is made up of ____________ bones.
Answer: 14
In simple words: Fourteen facial bones form the structure of our face and jaw.

Exam Tip: Facial skeleton contains 14 distinct bones.

II. Name the following

Question 1. Other name of backbone ________________
Answer: Spine or Vertebral column
In simple words: The backbone protects the spinal cord and is made of small bones called vertebrae.

Exam Tip: Consists of 33 small ring-like bones in children, fusing to 26 in adults.

Question 2. Two pairs of lower ribs which are not attached to breast bone. _____________
Answer: Floating ribs
In simple words: The bottom two pairs of ribs are called floating ribs because their front ends are not attached to the breastbone.

Exam Tip: Pairs 11 and 12 are floating ribs.

Question 3. The point where two separate bones meet _______________
Answer: Joint
In simple words: Joints allow our skeleton to bend and move.

Exam Tip: Movable joints include hinge, ball and socket, pivot, and gliding joints.

Question 4. Tough tissues which bones are held together _______________
Answer: Ligaments
In simple words: Ligaments are strong elastic bands that connect bone to bone at a joint.

Exam Tip: Remember: BLT - Bone to Ligament to Bone.

Question 5. The muscles of heart __________________
Answer: Cardiac muscles
In simple words: Special involuntary muscles that pump blood throughout our life without ever getting tired are cardiac muscles.

Exam Tip: Cardiac muscles are involuntary in action but striated in appearance.

Question 6. The strong fibres by which the bones are held together _____________
Answer: Ligaments
In simple words: Ligaments hold bones tightly together at joints.

Exam Tip: Similar to question 4; ligaments provide joint stability.

Question 7. The long curved bones that form the rib cage ________________
Answer: Ribs
In simple words: Twelve pairs of ribs form a protective cage around the heart and lungs.

Exam Tip: Rib cage protects vital thoracic organs.

Question 8. The framework of bones ________________
Answer: Skeleton
In simple words: The skeletal system gives shape, support, and protection to the human body.

Exam Tip: An adult human skeleton has 206 bones.

Lesson -8 Food and Health (only for FA3)

I. Fill in the blanks

Question 1. The diet which contains proper proportion of all important substances is called a _____________.
Answer: Balanced diet
In simple words: A balanced diet includes carbohydrates, proteins, fats, vitamins, minerals, water, and roughage in correct amounts.

Exam Tip: Essential for proper growth and good health.

Question 2. Deficiency or lack of particular mineral or vitamin causes _______________ diseases.
Answer: Deficiency
In simple words: Diseases caused by lacking specific nutrients in our diet are deficiency diseases.

Question 3. ___________ are single called micro organisms.
Answer: Bacteria
In simple words: Bacteria are tiny, single-celled living organisms found everywhere.

Exam Tip: Some bacteria cause diseases, while others are highly beneficial.

Question 4. Vaccination was discovered by ____________________
Answer: Edward Jenner
In simple words: Edward Jenner developed the first successful smallpox vaccine.

Exam Tip: Vaccines protect us from infectious diseases by building immunity.

Question 5. Plaque is spread by _______________ that live on rats.
Answer: Fleas
In simple words: Fleas living on infected rats transmit the plague bacterium to humans.

Exam Tip: Vector-borne disease transmitted by rat fleas.

Question 6. Typhus fever is carried by ___________ which lives on sick persons.
Answer: Lice
In simple words: Body lice spread typhus fever among humans.

Exam Tip: Maintain personal hygiene to prevent infestations.

II. Name the following:

Question 1. Disease caused by lack of iodine _________________
Answer: Goitre
In simple words: Lack of iodine in diet causes swelling of the thyroid gland in the neck, known as goitre.

Exam Tip: Use iodized salt to prevent goitre.

Question 2. Disease caused by deficiency of blood in the body _____________
Answer: Anemia
In simple words: Iron deficiency leads to anemia, where blood has low hemoglobin and causes fatigue.

Exam Tip: Eat iron-rich foods like spinach, apples, and pomegranate.

Question 3. Three disease causing germs _________, _________, __________
Answer: Bacteria, Viruses, Protozoa (or Fungi)
In simple words: Microbes that cause illnesses are pathogens like bacteria, viruses, and protozoa.

Exam Tip: Master these three primary classes of germs.

Question 4. Two diseases caused by bacteria _____________, _____________
Answer: Tuberculosis, Cholera (or Typhoid)
In simple words: Bacterial infections include TB, typhoid, and cholera.

Exam Tip: Bacterial diseases can typically be treated with antibiotics.

Question 5. Two diseases caused by protozoa ____________, _____________
Answer: Malaria, Dysentery
In simple words: Malaria and amoebic dysentery are caused by protozoan parasites.

Exam Tip: Malaria is spread by female Anopheles mosquitoes.

Question 6. Two diseases caused by virus ______________, ______________
Answer: Common cold, Polio (or Measles, Chickenpox)
In simple words: Viral infections include the common cold, polio, and measles.

Exam Tip: Viruses are smaller than bacteria and do not respond to antibiotics.

Question 7. Two diseases caused by infected food and water ______, _______
Answer: Cholera, Typhoid (or Jaundice, Diarrhoea)
In simple words: Consuming contaminated food and water spreads water-borne diseases.

Exam Tip: Always drink boiled or filtered water.

Question 8. Two diseases caused by insects ___________, _______________
Answer: Plague, Malaria (or Dengue, Typhus)
In simple words: Insects like fleas and mosquitoes transmit various diseases.

Exam Tip: Keep surroundings clean to prevent insect breeding.

Question 9. Two diseases caused by mosquitoes __________, _____________
Answer: Malaria, Dengue (or Chikungunya)
In simple words: Mosquitoes spread deadly illnesses like malaria and dengue.

Question 1. The earth is made up of __________ and ______________
Answer: Rocks, minerals
In simple words: The solid crust of the earth is composed of rocks and minerals.

Exam Tip: Rocks are natural mixtures of minerals.

Question 2. The magma that reaches the earth’s crust and flows out is called _______________
Answer: Lava
In simple words: Melted rock from inside the earth is called magma when underground, and lava when it reaches the surface.

Exam Tip: Cooling of lava forms extrusive igneous rocks.

Question 3. Minerals used for extracting metals are called ________________
Answer: Ores
In simple words: Ores are rocks containing high concentrations of valuable metals.

Exam Tip: Iron is extracted from hematite ore, aluminum from bauxite.

Question 4. The inorganic substances found in the earth’s crust are called ______________________
Answer: Minerals
In simple words: Naturally occurring inorganic solid substances with definite chemical composition are minerals.

Question 5. ____________ is used for dry cleaning of woolen clothes.
Answer: Petrol (or Benzene / Petroleum spirit)
In simple words: Petroleum products are used as solvents in dry cleaning delicate garments.

Exam Tip: Useful industrial application of mineral resources.

II. Name the following

Question 1. Three types of sedimentary rocks ____________, __________, ___________
Answer: Sandstone, Limestone, Shale (or Conglomerate)
In simple words: Sedimentary rocks are formed by layers of sediments pressed together over time.

Exam Tip: Often contain fossils of ancient plants and animals.

Question 2. Three types of igneous rocks ___________, ______________, ______________
Answer: Granite, Basalt, Pumice (or Obsidian)
In simple words: Igneous rocks form when molten rock cools and solidifies.

Exam Tip: Also known as primary rocks.

Question 3. Three types of metamorphic rocks ____________, ____________, ____________
Answer: Marble, Slate, Quartzite (or Gneiss)
In simple words: Existing rocks transformed by intense heat and pressure deep inside the earth become metamorphic rocks.

Exam Tip: Limestone changes to marble; shale changes to slate.

Question 4. Rock formed by metamorphosis of limestone _______________
Answer: Marble
In simple words: Limestone transforms into beautiful marble under heat and pressure.

Exam Tip: Used widely in statues and buildings like the Taj Mahal.

Question 5. Rock formed by metamorphosis of granite _________________
Answer: Gneiss
In simple words: Granite changes into banded gneiss under extreme geological pressure.

Exam Tip: Common metamorphic rock transformation.

Question 6. Rock formed by metamorphosis of shale __________________
Answer: Slate
In simple words: Soft shale hardens into slate used for writing slates and roof tiles.

Exam Tip: Splits easily into thin, flat sheets.

Question 7. Three rock forming minerals _________, _________, __________
Answer: Quartz, Feldspar, Mica
In simple words: These are the most common minerals found making up rocks like granite.

Question 8. Two underground resources _____________, _________________
Answer: Coal, Petroleum (or Natural gas, Minerals)
In simple words: Valuable materials dug up from beneath the earth's surface are underground resources.

Exam Tip: Fossil fuels are non-renewable underground resources.

Question 9. Remains of plants and animals under the earth ________________
Answer: Fossils
In simple words: Preserved remains or impressions of ancient living things found in sedimentary rocks are fossils.

Exam Tip: Fossils help scientists study the history of life on Earth.

Question 10. Rocks that have changed ________________________
Answer: Metamorphic rocks
In simple words: 'Meta' means change and 'morph' means form; thus metamorphic rocks are changed rocks.

Exam Tip: Formed from igneous or sedimentary rocks under heat and pressure.

III. Match the following

Answer: 1 - Fuel, 2 - Ornaments, 3 - For growth in plants, 4 - Taj Mahal, 5 - Dentist to polish teeth
In simple words: Each mineral or resource is matched with its primary use.

Exam Tip: Pumice is a light igneous rock used as an abrasive in dental polish and body scrubbers.

L-10 States of Matter (FA4 + SA2)

I. Fill in the blanks

Question 1. Anything that occupies space and has weight is called __________
Answer: Matter
In simple words: Everything around us that has mass and takes up space is matter.

Exam Tip: Basic scientific definition of matter.

Question 2. A ___________ has a definite shape and volume.
Answer: Solid
In simple words: Solids keep their own rigid shape and fixed volume because molecules are tightly packed.

Exam Tip: Example: stone, book, pencil.

Question 3. A ___________ has a definite volume but no definite shape.
Answer: Liquid
In simple words: Liquids take the shape of the container they are poured into, but their volume stays constant.

Exam Tip: Example: water, milk, oil.

Question 4. ___________ has neither a definite volume nor a definite shape.
Answer: Gas
In simple words: Gases spread out to fill any available container completely.

Exam Tip: Example: air, oxygen, water vapour.

Question 5. Made is made up of _____________________
Answer: Molecules (Note: 'Matter' is intended here)
In simple words: Matter is composed of tiny molecules and atoms.

Exam Tip: Matter is made up of molecules.

Question 6. When a solute dissolves in a solvent we get a ______________
Answer: Solution
In simple words: A solute dissolved in a solvent forms a uniform mixture called a solution.

Exam Tip: Example: Salt dissolved in water forms salt solution.

Question 7. When atoms of different kinds combine ___________ are formed.
Answer: Compounds
In simple words: Chemical combination of different atoms creates compounds.

Exam Tip: Example: Water (\(H_2O\)) is a compound of hydrogen and oxygen.

Question 8. Conversion of liquid into gaseous state is called _____________
Answer: Evaporation (or Vaporization)
In simple words: Change of liquid water into water vapour is evaporation.

Question 1. The space between molecules ______________
Answer: Intermolecular space
In simple words: The empty gaps between neighboring molecules are intermolecular spaces.

Exam Tip: Least in solids, moderate in liquids, and largest in gases.

Question 2. The three states of matter ___________, __________, _________
Answer: Solid, Liquid, Gas
In simple words: The three common physical states in which matter exists.

Exam Tip: States depend on molecular arrangement and temperature.

Question 3. Tiny particles by which molecules are made up of _____________
Answer: Atoms
In simple words: Atoms are the fundamental building blocks of molecules.

Exam Tip: Atoms join together to form molecules.

Question 4. The liquid in which a solid dissolves ________________
Answer: Solvent
In simple words: The dissolving liquid (like water) is the solvent.

Exam Tip: Water is known as the universal solvent.

Question 5. A solid which dissolved in the liquid ________________
Answer: Solute
In simple words: The substance that dissolves (like sugar or salt) is the solute.

Exam Tip: Solute + Solvent = Solution.

Question 6. A homogeneous mixture of solute and solvent _____________
Answer: Solution
In simple words: A clear, uniform mixture where solute is fully dissolved in solvent.

Exam Tip: Particles of solute are not visible in a true solution.

Question 7. Matter made up of different kinds of atoms combined in fixed numbers _____________
Answer: Compound molecule
In simple words: A molecule containing different types of atoms in fixed ratios.

Exam Tip: Distinct from elements which consist of only one type of atom.

III. Write the type of change in the following

Question 1. Heating water into vapours _______________
Answer: Physical change (or Reversible change)
In simple words: Water vapour can be cooled back into liquid water, so no new substance is formed.

Exam Tip: Physical changes are temporary and reversible.

Question 2. Melting ice into water ________________
Answer: Physical change (or Reversible change)
In simple words: Ice melting into water is physical because water can be frozen back into ice.

Exam Tip: Change of state is always a physical change.

Question 3. Burning of paper ______________
Answer: Chemical change (Irreversible change)
Answer: Chemical change
In simple words: Burning creates ash and smoke, and you cannot get the original paper back.

Exam Tip: Chemical changes form entirely new substances and are permanent.

Question 4. Making a chapatti _____________
Answer: Physical change (rolling dough) / Chemical change (when baked on fire)
In simple words: Rolling dough is a physical change, but baking the chapatti on fire makes it a chemical change.

Question 1. There are _________ kinds of simple machines
Answer: 6 (six)
In simple words: The six classic simple machines are lever, pulley, inclined plane, wedge, screw, and wheel and axle.

Exam Tip: Learn all six simple machines by heart.

Question 2. In lever of first order fulcrum is in the ______________
Answer: middle (between load and effort)
In simple words: In a first-order lever, the pivot or fulcrum lies between the load and the effort (e.g., scissors, seesaw).

Exam Tip: Remember code FLE - 1st order has F in the middle.

Question 3. In a steering wheel of a car _________ is a wheel and ________ is the axle.
Answer: steering wheel, rod (or column)
In simple words: The circular steering ring is the wheel, and the shaft connected to it is the axle.

Exam Tip: Wheel and axle makes turning heavy steering mechanisms easier.

Question 4. If we place two inclined planes back to back together, we get a __________
Answer: Wedge
In simple words: A wedge consists of two inclined planes joined back-to-back, used for cutting or splitting (like an axe or knife).

Exam Tip: Knife blades and nails act as wedges.

Question 5. An object that floats on water displaces water _________ to its own weight.
Answer: equal
In simple words: According to Archimedes' principle, a floating object displaces a weight of water equal to its own weight.

Exam Tip: Buoyant force equals the weight of displaced liquid.

II. Name the following

Question 1. Two examples of first order lever ___________, ____________
Answer: Scissors, Seesaw (or Crowbar, Pliers)
In simple words: Levers with the fulcrum in the middle include scissors and seesaws.

Exam Tip: Fulcrum is always centrally placed.

Question 2. Two examples of second order lever _________, ____________
Answer: Wheelbarrow, Nutcracker (or Bottle opener)
In simple words: Levers with the load in the middle (ELF) are second-order levers.

Exam Tip: Load is between fulcrum and effort.

Question 3. Two examples of third order lever ___________, _____________
Answer: Tongs, Fishing rod (or Broom, Tweezers)
In simple words: Levers with the effort applied in the middle (FEL) are third-order levers.

Exam Tip: Effort is between fulcrum and load.

Question 4. An inclined plane wrapped round a rod _____________________
Answer: Screw
In simple words: A screw is essentially an inclined plane wound spirally around a cylinder.

Exam Tip: Used to hold objects firmly together.

Question 5. Wheels used with ropes to lift things ________________
Answer: Pulley
In simple words: A grooved wheel with a rope running through it is a pulley used to lift heavy loads easily.

Exam Tip: Used in drawing water from wells and flagpoles.

Question 6. Weight of an object in water _____________
Answer: Apparent weight (less than actual weight due to buoyant force)
In simple words: Objects feel lighter in water because water pushes them upward.

Exam Tip: Upthrust reduces apparent weight.

Question 7. Weight of an object in air _________________
Answer: True weight (Actual weight)
In simple words: The actual pull of gravity on an object in air without water buoyancy.

Exam Tip: Measured directly using a spring balance in air.

Question 8. The upward force acting on an object in a liquid ______________
Answer: Buoyant force (Upthrust)
In simple words: The upward push exerted by liquid on any immersed object is buoyant force.

Exam Tip: Determines whether an object floats or sinks.

III. Mark the load, fulcrum and effort points in the following: (L, F, E)

Question 1. First order lever (Fulcrum in the middle)
Answer: [Fulcrum (F) in center, Load (L) at one end, Effort (E) at the other end]
In simple words: In first order levers like seesaws, F is in the middle between L and E.

Exam Tip: Remember F-L-E order for 1st order levers (Fulcrum middle).

Question 2. Second order lever (Load in the middle)
Answer: [Load (L) in center, Fulcrum (F) at one end, Effort (E) at the other end]
In simple words: In wheelbarrows, the load sits in the middle between the wheel (fulcrum) and handles (effort).

Exam Tip: Remember L-F-E or E-L-F order with Load in the center.

Question 3. Third order lever (Effort in the middle)
Answer: [Effort (E) in center, Fulcrum (F) at one end, Load (L) at the other end]
In simple words: When using tongs or holding a fishing rod, effort is applied in the middle.

Exam Tip: Effort is sandwiched between fulcrum and load.

L-12 Safety and First Aid

I. Fill in the blanks

Question 1. _____________ are caused due to carelessness and wrong actions.
Answer: Accidents
In simple words: Most accidents happen when we are careless or disobey safety rules.

Exam Tip: Safety rules prevent accidental injuries.

Question 2. The immediate help give to an injured or sick person before the arrival of a doctor is called _________________
Answer: First aid
In simple words: First aid is the immediate medical care given before professional help arrives.

Exam Tip: Can save lives in emergencies.

Question 3. A dog’s bite may cause ___________________
Answer: Rabies
In simple words: Rabies is a dangerous viral disease transmitted through bites of infected dogs or animals.

Exam Tip: Seek immediate anti-rabies vaccination after animal bites.

Question 4. Fracture is caused when a _____________ is broken
Answer: Bone
In simple words: A crack or break in a bone is called a fracture.

Exam Tip: Immobilize fractured limbs using splints.

Question 5. ________ burns are dressed with baking soda solution.
Answer: Acid
In simple words: Mild acid burns are neutralized using a weak base like baking soda solution.

Exam Tip: For alkali burns, wash with vinegar or dilute lemon juice.

II. Name the following

Question 1. A crack or break in a bone _______________
Answer: Fracture
In simple words: Broken bones are medically termed fractures.

Exam Tip: Requires medical attention and X-rays.

Question 2. A piece of cardboard or sheet of newspaper used to hold a broken bone in its right position ______________
Answer: Splint
In simple words: A rigid support tied to a broken limb to keep it steady is a splint.

Exam Tip: Prevents further injury to surrounding tissues.

Question 3. A piece of cloth or bandage passing over shoulder to support the fractured arm _______________
Answer: Sling
In simple words: A triangular bandage hung from the neck to support an injured arm is a sling.

Exam Tip: Keeps fractured arm immobilized and elevated.

Question 4. Tight band that is twisted above the wound _____________
Answer: Tourniquet
In simple words: A tight band used in emergencies to stop severe bleeding from an artery or vein.

Exam Tip: Use with caution to prevent cutting off all blood circulation permanently.

Question 5. The first help given to an injured person before taking him to hospital _____________
Answer: First aid
In simple words: Initial emergency treatment given at the accident site.

Exam Tip: Every student should know basic first aid procedures.

L-13 A house to live in

I. Fill in the blanks

Question 1. Houses in cold areas like Kashmir have ________ roofs.
Answer: Sloping
In simple words: Sloping roofs let snow and rain slide off easily instead of piling up.

Exam Tip: Roof design depends heavily on local climate.

Question 2. Houses in Assam are mostly made of _____________
Answer: Bamboo and wood
In simple words: Stilt houses in heavy rainfall regions like Assam are built using bamboo and wood.

Exam Tip: Raised platforms protect homes from floods.

Question 3. Houses on raised platforms are called _____________
Answer: Stilt houses
In simple words: Houses built high above the ground on wooden poles are stilt houses.

Exam Tip: Common in flood-prone areas.

Question 4. The __________ makes the plan of the house and decides the size and layout.
Answer: Architect
In simple words: An architect designs house blueprints and floor plans.

Exam Tip: Professional designer of buildings.

Question 5. Doors and windows should be covered by __________ to keep away insects.
Answer: Wire mesh (mosquito nets)
In simple words: Fine mesh screens on windows let fresh air in while keeping mosquitoes and flies out.

Exam Tip: Prevents vector-borne insect pests from entering.

Question 6. A __________ provides us shelter, warmth and safety.
Answer: House (Home)
In simple words: A house is a safe dwelling place protecting us from weather and enemies.

Exam Tip: Basic human need for shelter.

Question 7. Bathroom, Kitchen and drains should be washed with ________
Answer: Disinfectants (phenyl / germicides)
In simple words: Using disinfectants keeps wet areas germ-free and hygienic.

Exam Tip: Essential for maintaining home sanitation.

II. Name the following

Question 1. Wooden houses built on raised platforms with slopping roofs. _____________
Answer: Stilt houses
In simple words: Houses on wooden stilts with sloping roofs are built in regions with heavy rainfall.

Exam Tip: Ideal for waterlogged regions.

Question 2. The system of disposal of sewage from the house _____________
Answer: Drainage system
In simple words: Safe removal of wastewater and sewage through covered drains.

Exam Tip: Proper drainage prevents disease outbreaks.

Question 3. Three main factors that influence the type of house ____________, ___________, ________________
Answer: Climate, Budget (money available), Availability of building materials
In simple words: Weather conditions, building materials, and cost decide what kind of house is built.

Exam Tip: Key determinants of architectural design.