To reduce exam fear, Class 8 Basic Science Question Paper Kerala Syllabus Set 5 provide good practice.
Kerala Syllabus 8th Standard Basic Science Model Question Paper Set 5
Time: 2 hour
Total score: 60
Instructions:
- The first 15 minutes is cool-off time. This time is meant for reading the questions and planning your answers.
- This question paper includes 10 questions in sections A, B and C
- You need to answer only one of the options provided for each of the choice-based questions.
PHYSICS
Time: 40 minutes
Total Score: 20
Section – A
Select the correct answer for questions 1 to 2. Answer all questions. (1 score for each question) (2 × 1 = 2)
Question 1.
Choose the correct equation of pressure.
a) P = F × A
b) P = A/ F
c) P = F/A
d) P = F + A
Answer:
c) P = F/A
Question 2.
Statement 1 : Virtual images can be caught on a screen.
Statement 2 : A convex mirror always forms a virtual .small and erect image.
Analyse these statements and find out the correct choice from the following
a) Both statements are correct
b) Only the second statement is correct
c) Only the first statement is correct
d) Both statements are incorrect
Answer:
b) Only the second statement is correct
Section – B
Answer questions 3 to 8 in more than one sentence. Questions 7 and 8 have choices. (2 score for each question) (6 × 2 = 12)
Question 3.
Lightning conductors are installed to safeguard tall buildings from lightning strikes.
a) Pointed edges are used in lightning conductors. What is the scientific principle behind it?
b) Poorly earthed lightning conductors are more harmful than beneficial. What is the reason?
Answer:
a) Charge density will be greater at pointed edges.
b) Because if the lightning conductor is not properly earthed, the electric charge cannot safely go into the ground, and it may cause damage or electric shock instead.
Question 4.
Based on the fundamental physical quantity length, write down the following questions.
a) In which unit is the thickness of plastic carry bags expressed?
b) How many kilometres make one astronomical unit?
Answer:
a) micrometre
b) 15 crore kilometre
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Question 5.
a) What do you mean by magnetic levitation?
b) Write any one use of magnetic levitation.
Answer:
a) Magnetic levitation is the phenomenon where an object is made to float in the air using magnetic force. It happens when the magnetic repulsion or attraction balances the force of gravity.
b) • Maglev launch system
• Magnetic bearings in machines (.Anyone)
Question 6.
Define the given terms related to a spherical mirror.
a) Aperture
b) Pole
Answer:
a) The diameter of the circular reflecting surface of a spherical mirror is called the aperture.
b) The midpoint of the reflecting surface is called the pole(P).
Question 7.
A. Assume you are given an object with a positive charge. Write down a suitable method to charge a metal sphere using this.
| Object | Charge to be gained | Suitable charging method |
| Metal sphere | Positive | ___(a)___ |
| Metal sphere | Negative | ___(b)___ |
Answer:
a) Charging by conduction
b) Charging by induction
B. The dangers of lightning strikes are very serious. Write any two first aid to be provided if a person is struck by lightning?
Answer:
- The person struck by lightning should be laid flat in a well-ventilated area.
- Massage the entire body to warm it up.
- Provide artificial respiration.
- Apply intermittent, pressure on the chest, (any two)
Question 8.
A. A student is trying to make a device to find direction using a magnetic needle. For this, he places the magnetic needle inside a box made of iron.
a) Will this device work properly?
b) Explain your answer.
Answer:
a) No, the device will not work properly.
b) The magnetic field of earth will not influence the needle due to high permeability of iron. So the needle cannot point correctly to the north.
OR
B. AB is a bar magnet shown in the figure. An iron rod CD is placed near its B pole.

a) Which magnetic poles will be formed at the ends C and D?
b) Which property of magnets does this phenomenon demonstrate?
Answer:
a) Poles formed in C (near B) will become a north pole and D will become a south pole.
b) This shows magnetic induction (a magnet can induce poles in a nearby iron object).
Section – C
Questions 9 to 10 carry 3 score each. Question 10 has a choice. (2 × 3 = 6)
Question 9.
What is frictional force? Point out two disadvantages of friction in our daily life and suggest remedy for overcoming it?
Answer:
When a surface moves or tries to move over another surface, a parallel force is produced between them against their relative motion. This force is called frictional force.
- Difficulty to draw water from the well. Remedy – Apply oil in the pulley.
- Chains of bicycles sometimes does not move due to friction. Remedy – Apply grease on it.
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Question 10.
A. Write down reasons for the following statements.
a) Astronauts wear specially designed suits.
b) Sewing needles are made with sharp tips. .
c) Connecting the wheels of tanks and other such vehicles using wide chains.
Answer:
a) The suit helps to maintain the pressure between the dress and the body equal to the atmospheric pressure.
b) Sharp tips have less surface area of contact. As area of contact decreases, pressure increases so that sewing needles can pierce into the materials to be stitched easily.
c) Connecting wheels of tanks and other such vehicles using wide chains helps in making more surface area of contact with the ground to exert less pressure over it. This ensures its smooth motion.
OR
B.The thrust acting per unit area by a liquid is the liquid pressure.

a) Three points A, B and C are marked on a cylindrical glass vessel filled with water as shown in figure. If three identical inflated balloons are placed on these points inside the cylinder, which one will be the largest in size? Justify your answer.
Answer:
a) The balloon placed in the position A will be the largest in size. As depth decreases liquid pressure also decreases. The pressure experienced at position A is the least compared to positions B and C and so the balloon with largest size occupies position A.
b) Do you expect any change in size to the balloons, if the water is replaced with kerosene? Explain.
Answer:
Yes, when kerosene is replaced with water the size of the balloons become comparatively larger than in water because kerosene has low density than water. When density decreases liquid pressure also decreases. So when the pressure experienced is less, the size of balloons (volume of balloons) is comparitively larger.
CHEMISTRY
Time: 40 minutes
Total Score: 20
Section – A
Answer all the questions from 1 to 2.1 score each.
Question 1.
Match the following
| Column A | Column B |
| a) Universal solvent | (i) Water moderates body temperature |
| b) High heat capacity | (ii) Soap lather well |
| c) Surface tension | (iii) Dissolves most substances |
| d) Soft water | (iv) Enables small insects to walk on water |
A. a-iii, b-i, c-iv, d-ii
B. a-ii, b-i, c-iv, d-iii
C. a-ii, b-iv, c-i, d-iii
D. a-i, b-iii, c-iv, d-ii
Answer:
| Column A | Column B |
| a) Universal solvent | (iii) Dissolves most substances |
| b) High heat capacity | (i) Water moderates body temperature |
| c) Surface tension | (iv) Enables small insects to walk on water |
| d) Soft water | (ii) Soap lather well |
Question 2.
(i) Acids turn blue litmus paper red.
(ii) Acids release hydroxide ions (OH–) in aqueous solution. Choose the correct one from the options given below.
A – Both the statements (i) and (ii) are incorrect.
B – Statement (ii) is correct. However, statement (i) is incorrect.
C – Statement (i) is correct. However, statement (ii) is incorrect.
D – Both the statements (i) and (ii) are correct.
Answer:
C – Statement (i) is correct. However, statement (ii) is incorrect.
Section B
Two questions from 3 to 8 have choices. Each question carries 2 scores. (6 × 2 = 12)
Question 3.
The following are the findings of some experiments with acids.
• A piece of paper rubbed with hibiscus changes colour when dipped in lemon juice.
• Buttermilk, Vinegar, lemon juice and tamarind have a common taste.
• Bubbles form when zinc is added to vinegar.
Examine the findings and write the general properties of acids.
Answer:
Have a sour taste
• Carbon dioxide gas is formed by reacting with carbonates.
• Hydrogen gas is liberated by reacting with highly reactive metals such as zinc and magnesium.
Question 4.
A. Due to the intermolecular attraction between water molecules, a force arises that tends to minimise the surface area of water. How can this be demonstrated?
Answer:
This property of water is called surface tension. It cati be demonstrated through simple experiments:
Experiment: Gently place a needle or a razor blade on the surface of still water. Even though the object is denser than water, it tloats because the water’s surface behaves like a stretched film due to surface tension. Observation: The needle remains on the surface without sinking, showing that the water surface resists external force and tries to minimise its surface area.
Conclusion: The ability of water to support light objects and form spherical droplets is due to surface tension, which is caused by intermolecular attraction.
OR
B. Explain how the boiling point of water varies under the following conditions:
a. In high-altitude areas
b. In pressure cookers
Answer:
a) At high altitudes, atmospheric pressure is lower, so water boils at a ternperawre less than 100°C.
b) Inside a pressure cooker, the pressure is higher than normal, so the boiling point of water increases above 1OŒ’C, allowing food to cook faster.
Question 5.
A picture of the arrangement of copper plating on an iron bangle is drawn. What are the mistakes in this?

Answer:
Copper should be connected to the positive terminal of the battery. The iron bangle should be connected to the negative terminal of the battery. Copper sulfate solution should be used as the electrolyte (or solution).
Question 6.
Sugar is heated strongly in a dry boiling tube.
a) What will be the observation?
b) What products are formed?
Answer:
a) The diameter of the circular reflecting surface of a spherical mirror is called the aperture.
b) The midpoint of the reflecting surface is called the pole(P).
Question 7.
What is the energy change occurring in the following?
a) Combustion of fuel
b) Photosynthesis
Answer:
a) A black substance remains in the boiling tube.
b) Carbon (C), Water (H2O)
Question 8.
A. a) Identify the type of plastics shown in these symbols?

b) Which of the following is a polymer?
a. Bakelite
b. Boron
c. Potassium
d. Copper
Answer:
Code 1- PET (Polyethylene terephthalate)
Code 2- HDPE (High-density polyethylene)
b) Bakelite.
B. a) What is the advantage of blending natural fibres along with synthetic fibres?
b) Write down the uses of fibres
Answer:
a) Blending natural and synthetic fibres improves the texture, strength, and comfort of the fabric and reduces cost and wrinkling.
b) Nylon fibres are used to make fishing nets.
• Used to make bulletproof vests.
Section – C
One question from 9 to 10 have choice. Each question carries 3 scores. (2 × 3 = 6)
Question 9.
Observe the picture.

Calcium chloride is taken in a test tube. A smooth iron nail is moistened and passed through a cork, and the test tube is closed.
a) What will be the observation after a few days?
b) Write the reason for the observation.
c) What is the conclusion drawn from this?
Answer:
a) The part of the nail inside the test tube is not rusted. The part of the nail outside the test tube is rusted. The calcium chloride absorbs the moisture inside the test tube. Therefore, the iron does not rust.
b) The presence of water and moisture outside the test tube causes the iron to rust rapidly.
c) The presence of water and air affects the rusting of iron.
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Question 10.
A. Below are some statements related to early attempts at element classification. Match the statements with the ones in brackets that match them.
(Mendeleev, Dobereiner, Berzelius, Lavoisier, Newlands, Henry Moseley)
a) Classified the then-known elements into metals and non-metals.
b) Classified the elements of similar properties into groups of three.
c) Arranged the elements in ascending order of their atomic masses.
Answer:
a) Lavoisier.
b) Dobereiner.
c) Mendeleev.
B. Given Samples

a) How many hydrogen atoms are present in Sample Y?
b) Which samples contain the same total number of atoms per molecule?
c) Find the total number of atoms present in 4 molecules of Sample X.
Answer:
a) One molecule of NH3, contains:
N = 1
H = 3
2NH3 means two molecules:
Hydrogen atoms = 2 x 3 = 6 H atoms
b) Sample X(C2H6)
C = 2
H = 6
Total = 8 atoms
Sample Y:2NH3
N = 2
H = 6
Total = 8 atoms
Sample Z: CO2
C = 1
O = 2
Total = 3 atoms
Sample X and Y contain same number of atoms.
c) One molecule of C2H6 has 8 atoms.
So 4 molecules = 4 x 8 = 32 atoms
BIOLOGY
Time: 40 minutes
Total Score: 20
Section – A
Choices are given for questions 7, 8,10. Answer questions 1 and 2. Each question carries 1 score. (2 × 1 = 2)
Question 1.
Which is the correct order in the food chain?
a) Grass → vulture → Rabbit → Snake
b) Grass → Rabbit → Snake → Vulture
c) Vulture → Snake → Rabbit →Grass
d) Rabbit → Grass → Vulture → Snake
Answer:
b) Grass → Rabbit → Snake → Vulture
Question 2.
Match the Kingdoms with their main characteristics
| A | B |
| 1. Monera | a. Eukaryotic saprophytes without chlorophyll |
| 2. Protista | b. Multicellular, eukaryotic, heterotrophic |
| 3.Fungi | c. Prokaryotic organisms without true nucleus |
| 4. Animalia | d. Unicellular eukaryotes with flagella or cilia |
a) 1-c, 2-d, 3-a, 4-b
b) 1-d, 2-c, 3-b, 4-a
c) 1-a, 2-b, 3-c, 4-d
d) 1-b, 2-a, 3-d, 4-c
Answer:
| A | B |
| 1. Monera | c. Prokaryotic organisms without true nucleus |
| 2. Protista | d. Unicellular eukaryotes with flagella or cilia |
| 3.Fungi | a. Eukaryotic saprophytes without chlorophyll |
| 4. Animalia | b. Multicellular, eukaryotic, heterotrophic |
Section – B
Write answers to questions 3 to 8. Each question carries 2 score. (6 × 2 = 12)
Question 3.
Native varieties are beneficial for the environment. Justify the statement.
Answer:
Native varieties are adapted to the local environment and can be grown in harmony with it. They are naturally resistant to pests and diseases in the area, which reduces the use of pesticides. They also help maintain the ecological balance by supporting local pollinators. They also require less fertiliser, which can reduce costs.
Question 4.
Observe the picture and answer the questions below.

(a) Which are the organelles indicated by A and B in the picture?
(b) What is the function of these organelles?
Answer:
(a) A- Mitochondria, B- Centriole
(b) A Mitochondria – Energy production centre of the cell. It stores the energy obtained from the oxidation of glucose and distributes it as needed. B-Centriole – Helps in cell division.
Question 5.
A group of high school students is starting a new school year. They are considering joining various clubs but are also worried about balancing their social lives with the pressures of new media and academics. Suggest two specific positive activities that will aid their personality development and mental well-being, and briefly explain the risk associated with one negative modem influence they should be wary of.
Answer:
Positive Activities: Participation in various school clubs (aids personality development and nurtures a spirit of sendee) and nurturing good friendships (vital for mental well-being and growth).
Risk of New Media: Spending too much time in front of screens (new media) can cause many physical and mental health problems. The advice is to use new media wisely, recognising both its benefits and risks.
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Question 6.
Select and write the correct pairs.
(A) John Ray – First used the term ‘species’.
(B) Ernst Haeckel – Introduced the Six Kingdom Classification.
(C) Carl Linnaeus – Father of Taxonomy.
(D) Theophrastus – Introduced the Five Kingdom Classification.
Answer:
(A) and (C)
Question 7.
A. ‘The group of similar type of cells are known as tissues.’
Make a note of the differences between simple tissues and complex tissues.
Answer:
A. Tissues that are composed of similar types of cells are known as simple tissues. Parenchyma, collenchyma, and sclerenchyma are examples of simple tissues. Xylem and phloem are made up of cells of different shapes and sizes. Therefore, they are called complex tissues. The transport of water and salts to the leaves takes place through the xylem. The phloem tissues transport the food produced by the leaves to various parts.
OR
B. “Cells are often called the “building blocks of life” because they arc the smallest units that can perform all
the functions necessary for life. Cell biology is the study of cells.”
– What was the contribution of Robert Hooke and Anton van Leeuwenhoek to cell biology?
Answer:
B. Robert Hooke, a scientist, was observing a thin piece of cork through his microscope. He observed small parts like boxes stacked together. He called them ‘cells’, meaning chambers. Anton van Leeuwenhoek, using a much better microscope, observed water from a pond and discovered microorganisms in it.
Question 8.
A. Which of the following does not belong to the group? What is the common feature of the others?
A. Housefly, Lizard, Butterfly, Grasshopper
B. Cat, Dog, Tiger, Snake
C. Arecanut tree, Coconut tree, Jack tree, Palm tree
Answer:
A. Lizard, others are Invertebrates
B. Snake, others are Mammals
C. Jack tree, others are monocots
OR
B. Carl Linnaeus, who lived in the 18th century, was the one who introduced the different levels of classification.
a) What are the main steps in classification?
b) What are the classification levels between species and phylum?
Answer:
a) Identification, classification and naming of organisms are the main steps in classification.
b) Phylum – Class – Order – Family- Genus – Species
Section – C
Answer questions 9 and 10. Each question carries 3 score. (2 × 3 = 6)
Question 9.
Make pairs ofparts of male and female reproductive system along with their functions in the given box:
Testis, vas deferens, vagina, fallopian tube, uterus, penis, produces estrogen and progesterone, semen is deposited, growth of the embryo completes here, fertilization takes place, ovary, helps to deliver the sperm into the vagina, produces testosterone, transport male gametes from testes to the urethra
Example: Ovary-produces estrogen and progesterone.
Answer:
- Testis – produces testosterone
- Vas deferens – transports male gametes from the testes to the urethra
- Penis – helps to deliver the sperm into the vagina
- Vagina – semen is deposited
- Fallopian tube – fertilisation takes place
- Uterus – growth of the embryo completes here.
Question 10.
A. Complete the illustration.

Answer:
(a) By sharing images and information related to crops, you can find solutions to problems with the help of artificial intelligence.
(b) Plants are grown in nutrient solutions, and with the help of sensors, the amount of nutrients is detected and provided as needed.
(c) Aeroponics
B. A farmer raises cattle, chickens, ducks, fish, and rice.
a) What is this farming method known as?
b) What are the advantages of this farming method?
Answer:
a) Integrated farming
b) Multiple sources of income – Farmers can earn money from multiple activities, not just from one crops. Even if one crop fails, they can earn income from other crops. Efficient use of land and resources. Waste from one activity can be used for another by doing different activities in the same area.




























































































