SCIENCE ANNUAL PRACTICE PAPER 2025-26
Class: 8 | Subject: Science (086)
Section A: Multiple Choice Questions (1 Mark)
1. (I) When plants of the same kind are cultivated at one place on a large scale, it is called: [cite: 15]
Answer:
(B) Crop
1. (II) Which microorganism is used for the production of alcohol? [cite: 15]
Answer:
(C) Yeast
1. (III) Deforestation means: [cite: 17]
Answer:
(B) Cutting of trees
1. (IV) Changes occurring at puberty are controlled by: [cite: 17]
Answer:
(B) Hormones
1. (V) A chemical process in which a substance reacts with oxygen to give off heat is called: [cite: 17]
Answer:
(C) Combustion
1. (VI) The lowest temperature at which a substance catches fire is called its: [cite: 17]
Answer:
(C) Ignition temperature
1. (VII) Which of the following is a good conductor of electricity? [cite: 17]
Answer:
(B) Tap water
1. (VIII) A liquid that conducts electricity is called: [cite: 18]
Answer:
(B) Electrolyte
1. (IX) In the electrolysis of copper sulphate solution, where does copper get deposited? [cite: 18]
Answer:
(A) Cathode (Negative electrode)
1. (X) When two forces act in opposite directions on an object, the net force is: [cite: 18]
Answer:
(B) The difference between the two forces
1. (XI) Sound travels through: [cite: 18]
Answer:
(D) Solids, liquids, and gases
1. (XII) Loudness of sound depends on: [cite: 18]
Answer:
(B) Amplitude
Section B: Very Short Answer Questions (2 Marks)
2. (A) Name two major crops grown in India. Give one example of each. [cite: 19]
Answer:
- 1. Kharif Crop: e.g., Paddy (Rice), Maize (Grown in rainy season).
- 2. Rabi Crop: e.g., Wheat, Gram (Grown in winter season).
--- OR ---
2. (B) Why is preparation of soil important before sowing? [cite: 19]
Answer:
Preparation of soil (loosening/turning) is important because:
- It allows roots to penetrate deep and breathe easily.
- It helps in the growth of earthworms and microbes which enrich the soil with humus.
3. Name two changes that occur in boys at puberty. [cite: 19]
Answer:
1. Voice becomes deep/hoarse (Adam's apple becomes visible).
2. Growth of facial hair (beard and moustache) and sudden increase in height.
2. Growth of facial hair (beard and moustache) and sudden increase in height.
4. (A) What is Coke? Write one use of it. [cite: 19]
Answer:
Coke: It is a tough, porous, and black substance. It is an almost pure form of carbon.
Use: It is used in the manufacture of steel and in the extraction of many metals.
Use: It is used in the manufacture of steel and in the extraction of many metals.
--- OR ---
4. (B) How was petroleum formed? [cite: 19]
Answer:
Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom and got covered with layers of sand and clay. Over millions of years, absence of air, high temperature, and high pressure transformed the dead organisms into petroleum and natural gas.[Image of formation of petroleum]
5. Give one example each of friction being useful and harmful. [cite: 19]
Answer:
Useful: Friction allows us to walk on the ground and write with a pen.
Harmful: Friction causes wear and tear of machine parts and shoe soles.
Harmful: Friction causes wear and tear of machine parts and shoe soles.
Section C: Short Answer Questions (3 Marks)
6. (A) Explain any three uses of microorganisms in our daily life. [cite: 19]
Answer:
- Making Curd: Bacteria called 'Lactobacillus' promotes the formation of curd from milk.
- Baking: Yeast is used in the baking industry for making breads, pastries, and cakes (fermentation).
- Medicines: They are used to produce antibiotics (like Penicillin) to treat diseases.
--- OR ---
6. (B) What are antibiotics? Give two examples. [cite: 19]
Answer:
Antibiotics: These are medicines produced from microorganisms (fungi and bacteria) that kill or stop the growth of disease-causing microorganisms.
Examples: Penicillin, Streptomycin.
Examples: Penicillin, Streptomycin.
7. What are the different types of friction? Explain each briefly. [cite: 19]
Answer:
- Static Friction: The force required to overcome friction when an object starts moving from rest.
- Sliding Friction: The force required to keep an object moving with the same speed over a surface.
- Rolling Friction: The resistance encountered when one body rolls over the surface of another. It is the weakest friction.
8. (A) Why do camels have broad feet? [cite: 19]
Answer:
Camels have broad feet to increase the surface area in contact with the sand. According to physics, increasing the area reduces the pressure exerted. This prevents their feet from sinking into the sand and allows them to walk easily.
--- OR ---
8. (B) Why does liquid pressure increase with depth? [cite: 19]
Answer:
The pressure exerted by a liquid increases with depth because the weight of the water column above a point increases as we go deeper. This increased weight exerts more force per unit area, resulting in higher pressure at the bottom.
Section D: Long Answer Questions (5 Marks)
9. Fill in the blanks with appropriate words: [cite: 26]
Answer:
- i. The process by which living organisms produce new individuals of their own kind is called Reproduction.
- ii. The fusion of male and female gametes is called Fertilization.
- iii. In humans, fertilization takes place in the Oviduct (Fallopian tube).
- iv. Animals that give birth to young ones are called Viviparous.
- v. The transformation of the larva into an adult through drastic changes is called Metamorphosis.[Image of metamorphosis in frog]
10. Match the following (Column A - Column B): [cite: 26]
Correct Match:
- A. Rapid Combustion: LPG (1)
- B. Used as domestic fuel: LPG (1) or Candle (3)
- C. Temp at which substance catches fire: Ignition Temperature (2)
- D. Lowest ignition temperature: Phosphorus (4)
- E. Sudden heat, light and sound: Explosion (5)
11. (I) (a) Differentiate between Regular and Diffused reflection. (b) Why can we not see objects in the dark? [cite: 30]
Answer:
(a) Differences:
- Regular Reflection: Takes place from a smooth/polished surface (like a mirror). Rays are parallel after reflection.
- Diffused (Irregular) Reflection: Takes place from a rough surface (like a wall/wood). Rays are scattered in different directions.
(b) We see objects only when light reflects from them and enters our eyes. In the dark, there is no light to reflect, so objects are not visible.
- Regular Reflection: Takes place from a smooth/polished surface (like a mirror). Rays are parallel after reflection.
- Diffused (Irregular) Reflection: Takes place from a rough surface (like a wall/wood). Rays are scattered in different directions.
(b) We see objects only when light reflects from them and enters our eyes. In the dark, there is no light to reflect, so objects are not visible.
--- OR ---
11. (II) (a) Explain the laws of reflection with a labeled diagram. (b) Differentiate between Real and Virtual images. [cite: 30]
Answer:
(a) Laws of Reflection:
1. The angle of incidence ($\angle i$) is always equal to the angle of reflection ($\angle r$).
2. The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
[Image of laws of reflection diagram]
(b) Differences:
- Real Image: Can be obtained on a screen; it is always inverted.
- Virtual Image: Cannot be obtained on a screen; it is always erect (upright).
1. The angle of incidence ($\angle i$) is always equal to the angle of reflection ($\angle r$).
2. The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
[Image of laws of reflection diagram]
(b) Differences:
- Real Image: Can be obtained on a screen; it is always inverted.
- Virtual Image: Cannot be obtained on a screen; it is always erect (upright).
Section E: Case-Based Questions (4 Marks)
12. (Case: Forests - Lungs of the Earth) [cite: 30]
(a) What is deforestation?
(b) State two consequences of deforestation.
(c) Name any two protected areas in India. / (d) How does afforestation help maintain nature's balance?
(a) What is deforestation?
(b) State two consequences of deforestation.
(c) Name any two protected areas in India. / (d) How does afforestation help maintain nature's balance?
Answer:
(a) Clearing of forests on a large scale and using that land for other purposes (like agriculture or building).
(b) Increase in global warming (temperature), increased chances of floods and droughts.
(c) Jim Corbett National Park, Kaziranga National Park.
(d) (OR) Afforestation (planting trees) increases oxygen, absorbs CO2, prevents soil erosion, and maintains the water cycle.
(b) Increase in global warming (temperature), increased chances of floods and droughts.
(c) Jim Corbett National Park, Kaziranga National Park.
(d) (OR) Afforestation (planting trees) increases oxygen, absorbs CO2, prevents soil erosion, and maintains the water cycle.
13. (Case: Petroleum) [cite: 38]
(a) By what common name is petroleum known?
(b) What is refining of petroleum?
(c) Two products and uses / (d) Why use petroleum wisely?
(a) By what common name is petroleum known?
(b) What is refining of petroleum?
(c) Two products and uses / (d) Why use petroleum wisely?
Answer:
(a) Black Gold or Crude Oil.
(b) The process of separating the various constituents/fractions of petroleum (like petrol, diesel, etc.) in a refinery.
(c) Petrol (Fuel for cars), LPG (Fuel for home/cooking).
(d) (OR) Because it is an exhaustible natural resource (limited quantity) and its burning causes air pollution.
(b) The process of separating the various constituents/fractions of petroleum (like petrol, diesel, etc.) in a refinery.
(c) Petrol (Fuel for cars), LPG (Fuel for home/cooking).
(d) (OR) Because it is an exhaustible natural resource (limited quantity) and its burning causes air pollution.
14. (Case: Conductivity) [cite: 38]
(a) Why did the bulb not glow in distilled water?
(b) Why did the bulb glow after adding acid?
(c) What does this show? / (d) Name two liquids that conduct electricity.
(a) Why did the bulb not glow in distilled water?
(b) Why did the bulb glow after adding acid?
(c) What does this show? / (d) Name two liquids that conduct electricity.
Answer:
(a) Distilled water is free of salts and is a poor conductor (insulator) of electricity.
(b) Adding acid released ions, making the water a good conductor of electricity.
(c) It shows pure water is an insulator, but impure water (with salts/acids) is a conductor.
(d) (OR) Tap water, Lemon juice (or Vinegar).
(b) Adding acid released ions, making the water a good conductor of electricity.
(c) It shows pure water is an insulator, but impure water (with salts/acids) is a conductor.
(d) (OR) Tap water, Lemon juice (or Vinegar).
15. (Case: Sound and Vibration) [cite: 43]
(a) What is vibration?
(b) What happens to sound when vibration stops?
(c) Give an example where vibration produces sound. / (d) In which medium does sound travel fastest?
(a) What is vibration?
(b) What happens to sound when vibration stops?
(c) Give an example where vibration produces sound. / (d) In which medium does sound travel fastest?
Answer:
(a) The to-and-fro or back-and-forth motion of an object.
(b) The sound stops being produced.
(c) Plucking the string of a guitar.
(d) (OR) Sound travels fastest in Solids.
(b) The sound stops being produced.
(c) Plucking the string of a guitar.
(d) (OR) Sound travels fastest in Solids.