Practicing with Class 8 Basic Science Question Paper Kerala Syllabus and Annual Exam Question Paper 2023-24 will help students prepare effectively for their upcoming exams.
Class 8 Basic Science Annual Exam Question Paper 2023-24 Kerala Syllabus
Time: 2 hrs
Max. Score : 60
Instruction:
- The total cool off time for Physics, Chemistry and Biology is 15 minutes. Read the questions carefully and understand them during this time.
- Answers are to be written in the order Physics, Chemistry and Biology. The time for each section is 40 minute. The answer books must be returned to the teacher after writing each subject.
Physics
Time: 40 min
Score : 20
Answer any Three questions from 1 to 4. One score each. (3 × 1 = 3)
Question 1.
Identity the relation from the first pair and complete the second pair. (1)
Capacitance :: farad; Electric charge :: ……………………….
Answer:
coulomb
Question 2.
The figure shows the lines of force between the poles of two bar magnets. Identify the poles represented by A and B. (1)
Answer:
A: North B: North
Question 3.
Which is the unit of loudness? (1)
(m/s, dB, Hz, N)
Answer:
dB
Question 4.
From the following, identify the material that cannot be electrified by rubbing (1)
(Plastic Pipe, Glass rod, Hacksaw blade, PVC pipe)
Answer:
Hacksaw blade
(Since it is a conductor,the charges produced by rubbing spreads immediately.So it cannot be electrified by rubbing)
Answer any Four questions from 5 to 9. Two score each. (4 × 2 = 8)
Question 5.
When an object is placed at a distance of 20 cm from a concave mirror, a real image of the same size is formed. What is the focal length of the mirror? (2)
Answer:
R = 20 cm (Object distance (u)=Image distance (v). So the object is placed at C)
f = \(\frac{R}{2}\)
f = \(\frac{20}{2}\) = 10 cm
Question 6.
Write down any two characteristics of the magnetic lines of force around a bar magnet. (2)
Answer:
- Magnetic lines of force do not intersect with each other.
- Magnetic lines start from North Pole and reaches South Pole outside the Magnet, inside the magnet they start from South Pole and end at North Pole.
Question 7.
A negatively charged rod is brought near an electroscope as shown in the figure.
Copy down the diagram and mark the distribution of electric charge formed at A andB. (2)
Answer:
A: Positive charge
B: Negative charge
Question 8.
Why do the astronauts use radio devices to communicate with one another? (2)
Answer:
There is no medium in the space, sound need a medium to travel. So, they use radio devices to communicate with each other.
Question 9.
Classify the physical quantities given in the box as fundamental quantities and derived quantities. (2)
length, density, area, mass
| Fundamental quantities | Derived quantities |
Answer:
| Fundamental quantities | Derived units |
| Length, Mass | Area, density |
Answer any Three questions from 10 to 13. Three score each. (3 × 3 = 9)
Question 10.
Observe the figure.
a) Complete the ray diagram showing the mage formation by drawing the path of reflected rays. (2)
b) Write down any two features of the image formed. (1)
Answer:
b) Real, inverted and diminished
Question 11.
Bats can travel in darkness. Do you agree with this statement? Justify your answer. (3)
Answer:
Yes, When bats travel at night they produce ultrasonic waves. They have the ability to detect the presence of obstacles in their paths from the reflected ultrasonic waves from objects. Hence, they travel easily at night.
Question 12.
Write down three precautions to be taken for protecting ourselves from lightning. (3)
Answer:
- Do not operate electrical equipment’s.
- Do not lean on the wall of the house.
- Do not stand holding window bars or grills.
Question 13.
Classify the following statements with respect to concave mirror and convex mirror. (3)
a) Used as make up mirror.
b) Used as shaving mirror.
c) Used as rear view mirror in vehicles.
d) Used as reflectors in street lights.
e) Used in solar concentrators.
f) Placed on the side of curved roads.
| Concave mirror | Convex mirror |
Answer:
| Concave mirror | Convex mirror |
| a) Used as make up mirror | c) Used as rear view mirror in vehicles |
| b) Uses as shaving mirror | d) Used as reflectors in street lights |
| e) Used in solar concentrators | f) Placed on the side of curved road |
Chemistry
Time: 40 min
Score : 20
Answer any Three questions from 1 to 4. One score each. (3 × 1 = 3)
Question 1.
Choose the appropriate statement applicable to solid substances from the following (1)
i) Energy of constituent particles is very high
ii) Constituent particles have little freedom of movement
iii) Distance between constituent particles is very high
Answer:
ii) Constituent particles have little freedom of movement
Question 2.
Identify the polymer from the following. (1)
(Glucose, Amino acid, Protein)
Answer:
Protein
Question 3.
Water drops assume spherical shape due to _________ (1)
Answer:
Surface tension
Question 4.
Plastic is used to store chemical substances. Which property of plastic is used here? (1)
Answer:
Does not react with chemicals
Answer any 4 questions from 5 to 9. 2 Scores each (4 × 2 = 8)
Question 5.
Mg + O2 → MgO
a) What are the reactants and products of this reaction? (1)
b) Balance the above chemical equation. (1)
Answer:
a) Reactants: Mg, O Products: MgO
b) Mg + O2 → 2MgO
Question 6.
Natural fibres and Synthetic fibres are used for the manufacture of clothes.
a) Give the name of a natural fibres. (1)
b) Write one merit of synthetic fibres. (1)
Answer:
a) Cotton and silk
b) Cheaper than natural fibres, lasts longer (High durability)
Wrinkle free, can dry easily on getting wet.
Question 7.
Water pollution is a burning issue nowadays.
a) The deposition of biowastes in water resources results in the destruction of aquatic life. Why? (1)
Answer:
This depletes the amount of oxygen and results in the destruction of aquatic life.
b) Write a possible remedial measure to prevent water pollution. (1)
Answer:
- Avoid dumping wastes in water resources.
- Avoid rampant use of fertilisers.
- Avoid excessive use of detergents. (Any one)
Question 8.
Some chemical reactions are given. Choose the correct type of reaction to which they belong from the bracket.
(Endothermic reaction, Photochemical reaction, Exothermic reaction)
a) Neutralisation reaction between sodium hydroxide and hydrochloric acid. (1)
b) Decomposition of potassium permanganate. (1)
Answer:
a) Exothermic Reaction
b) Endothermic reaction
Question 9.
a) Which one of the given metals reacts most vigorously with dil.HCl? (1)
(Zinc, Copper, Magnesium, Iron)
b) Which is the gas produced here? (1)
Answer:
a) Magnesium
b) Hydrogen (H2)
Answer any 3 questions from 10 to 13. 3 Scores each. (3 × 3 = 9)
Question 10.
Equal quantity of water and coconut oil are taken in two separate beakers, heat them on a water bath.
a) In which of the two substances temperature rises slowly in a specified time? Give reason. (2)
Answer:
Water. Water has the ability to hold more heat when compared to other substances, (heat capacity)
b) Write one situation in which this property is made use of (1)
Answer:
- Water is used in radiators to regulate the heat in automobile engines.
- Water is used to cool hot objects. (Any one)
Question 11.
The components of a mixture of chalk powder and water can be separated using filter paper.
a) To which type does this mixture belong?( 1)
(True solution, Colloid, Suspension)
b) Write any two other characteristics of mixtures belonging to this type. (2)
Answer:
a) Suspension
b) Light is not passed through suspension. Keep it undisturbed; particles settle down Particles can be filtered by filter papers. (Any two)
Question 12.
Three samples are given below.
A – Water in which calcium sulphate is dissolved
B – Distilled water
C – Water in which magnesium bicarbonate is dissolved
a) In which sample does soap lather readily? (1)
b) Identify the sample in which soap lathers readily only on heating? Give reason. (2)
Answer:
a) B – Distilled water
b) C – Water in which magnesium bicarbo-nate is dissolved.
Reason: The water in which soap does not lather easily is called hard water. Here, the hardness of water is due to the presence of dissolved salts of calcium and magnesium. The hardness of water containing Calcium or Magnesium bicarbonates is removed during boiling. This type of hardness of water is known as temporary hardness.
Question 13.
Poly vinyl chloride (PVC) is used for plumbing, production of rain coats, bottles etc.
a) Which type of plastic is this? (1)
Answer:
Thermoplastics
b) Write anyone peculiarity of this type of plastic. (1)
Answer:
Plastics that get softened on heating and hardened on cooling 7 undergo physical change on heating/Recyclable (Any one)
c) Write any one method that can reduce pollution due to plastic. (1)
Answer:
Avoid disposable plastic products.
- During functions, use glass /ceramic/ steel utensils or natural substances
- Use paper, cloth, and plant material instead of plastic for decoration. (Any one)
Biology
Time: 40 min
Score : 20
Answer any Three questions from 1 to 4. One score each. (3 × 1 = 3)
Question 1.
Name the cell organelle given below. Write its function. (1)
Answer:
Golgi complex
Collects cell secretions like enzymes, hormones, mucous, etc, in small vesicles.
Question 2.
Find out the odd one and write the common feature of others. (1)
- Endometrium
- Testis
- Prostate gland
- Vas deferens
Answer:
Endometrium
Others are part of the male reproductive system
Question 3.
Answer the questions related to the given food chain. (1)
Grass → Grasshopper → Frog → Snake
a) Which is the primary consumer of this?
b) In Which trophic level does snake belong to?
Answer:
a) Grasshopper
b) Fourth trophic level
Question 4.
Identify the word relation and fill in the blanks. (1)
a) Female sex hormone : Estrogen
Male sex hormone : _________
b) Bacteria : Binary fission
Flydra : _________
Answer:
a) Testosterone
b) Budding
Answer any 4 from questions 5 to 9. (2 score each). (4 × 2 = 8)
Question 5.
Complete the illustration related to biodiversity-services by using the given hints.
Hints:
- Fuels
- O2 – CO2 balance
- Biological Control
- Rituals and their practices
Answer:
a) O2 CO2 balance
b) Biological control
c) Rituals and their practice
d) Fuels
Question 6.
Observe the given figure and answer the questions.
a) Identify and name the figure. (1)
b) Which cell organelle is found inside the part marked as ‘X’? What is its- importance? (1)
Answer:
a) Sperm/Male gamete
b) X: Mitochondrion
Provide energy for the movement of sperm.
Question 7.
“It is not essential to protect indigenous varieties, when plenty of high quality hybrids are available.”
Answer:
No Indigenous varieties have natural immunity. The management cost is low. The crops offer diverse tastes.
We can develop new high-quality varieties only from indigenous varieties.
Question 8.
The relevant part of a science journal is given below. Analyse it and answer the questions.
A decrease in the level of haemoglobin in the blood of adolescent children can cause a loss of memory and concentration.
a) Which disease condition is mentioned here? Deficiency of which element causes this condition? (1)
b) What are the changes to be made in the food habit of adolescents to prevent this disease condition? (1)
Answer:
a) Anaemia, deficiency of iron
b) Eat foods containing iron, take green vegetables, leafy vegetables, fruits and lentils in adequate quantities
Question 9.
Analyse the illustration and fill in the blanks.
Answer:
a) Parenchyma
b) Sclerenchyma
c) Help photosynthesis and Storage of food.
d) Provides mechanical support and flexibility to the stem
Answer any 3 from questions 10 to 13. (3 score each.) (3 × 3 = 9)
Question 10.
Complete the table related to ecological interactions in the ecosystem. (3)
| Interactions | Peculiarities | Example |
| Parasitism | a) | b |
| c) | b) Beneficial to one and is neither beneficial nor harmful to the other. | d) |
| e) | f) | Flower and butterfly |
Answer:
a) Beneficial to one partner and harmful to the other.
b) Mango tree and Loranthus/Cow and Tick/ Humans and Tapeworm/Pig and Leech
c) Commensalism
d) Mango tree and vanda/Shark and Remora
e) Mutualism
f) Beneficial to both the partners.
Question 11.
Analyse the statement related to five kingdom classification and answer the questions.
| Some bacteria belonging to kingdom monera are different from other bacteria in cell structure and physiological functions. |
a) Which bacteria is indicated here? (1)
b) What modification was made in the five kingdom classicisation to include this bacteria? (1)
c) Name the scientist who proposed this modification? Which level of classification above the kingdom was proposed by him? (1)
Answer:
a) Archaebacteria
b) Kingdom Monera is divided into two kingdoms, namely archaea and bacteria.
c) Carl Woese, Domain.
Question 12.
Answer the given questions related to biodiversity conservation.
a) In which conservation method, organisms are protected in their natural habitats? (1)
b) Choose examples related to this conser-vation method, from the given list. (1)
- National park
- Ecological hotspot
- Botanical garden
- Gene bank
c) Name two organisations with the objective of protecting biodiversity. (1)
Answer:
a) In-situ Conservation
b) National Parks, Ecological hotspots
c) IUCN (International Union for Conservation of Nature)
WWF (World Wide Fund For Nature) Specialised protective layers are seen outside the cell membrane of the ovum.
Question 13.
Observe the figure and answer the questions.
a) Identify the parts labelled as ‘X’, ‘Y’ in the given figure. (1)
b) What is the function of part ‘X’? (1)
c) What are the peculiarities of the cell produced from part ‘Y’? (1)
Answer:
a) X: Fallopian tube /Oviduct Y: Ovary
b) X: Fertilisation takes place in the Fallopian tube.
It carries the egg from the ovary to the uterus.
c) Ovum is spherical in its shape. It is non- motile.