Science Class 8 SEE Model Paper 2 2025-26 (Fearless Mastery)

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Science Class 8 SEE Model Paper 2

Science Class 8 SEE Model Paper 2

Section: A

  1. In which of the following cases are all the examples correctly matched?
  1. Elements — water, nitrogen, iron, air
  2. Uniform mixtures— minerals, seawater, bronze, air
  3. Pure substances— carbon dioxide, iron, oxygen
  4. Nonuniform mixtures — air, sand, brass, muddy water

Answer: C) Pure substances— carbon dioxide, iron, oxygen

  1. Oil is added to a glass partially filled with water. The oil floats on top. What does this tell you?
  1. Oil is denser than water
  2. Water is denser than oil
  3. Oil and water have the same density
  4. Oil dissolves in water

Answer: B) Water is denser than oil

  1. Which one of the following is the most appropriate statement?
  1. At a given temperature, a saturated solution is unable to dissolve additional solute.
  2. An unsaturated solution has dissolved the maximum amount of solute possible
  3. At that temperature, the saturated solution cannot accommodate any more solute.
  4. A saturated solution forms only at high temperatures

Answer: C) At that temperature, the saturated solution cannot accommodate any more solute.

  1. When the light is incident along the normal on the mirror, which of the following statements are true:
  1. Angle of incidence is 90°
  2. Angle of incidence is 0°
  3. Angle of reflection is 90°
  4. No reflection of light takes place in this case

Answer: B) Angle of incidence is 0°

  1. Which phase of the Moon occurs when it is completely invisible from Earth?
  1. Half Moon
  2. Full Moon
  3. Crescent Moon
  4. New Moon

Answer: D) New Moon

  1. Leap year occurs after every:
  1. 2 years
  2. 3 years
  3. 4 years
  4. 5 years

Answer: C) 4 years

  1. How many days are there in a normal year according to the solar (Gregorian) calendar?
  1. 360 days
  2. 364 days
  3. 365 days
  4. 366 days

Answer: C) 365 days

  1. The length of one lunar month is approximately:
  1. 20 days
  2. 25 days
  3. 29.5 days
  4. 31 days

Answer: C) 29.5 days

  1. What role do decomposers play in nature?
  1. Produce food
  2. Provide shelter
  3. Break down dead plants and animals
  4. Cause pollution

Answer: C) Break down dead plants and animals

Science Class 8 SEE Model Paper 2

  1. Why is Mars unable to sustain life in the same way Earth does?
  1. It has too many volcanoes.
  2. It is too close to the Sun.
  3. It lacks a thick atmosphere and liquid water.
  4. Its magnetic field is too strong.

Answer: C) It lacks a thick atmosphere and liquid water

  1. If the Earth were smaller with the same density, what might happen to its atmosphere?
  1. It would become thicker and hotter
  2. It would escape into space due to weaker gravity
  3. It would become frozen
  4. It would cause stronger winds

Answer: B) It would escape into space due to weaker gravity

  1. The Earth’s magnetic field is important because it:
  1. Keeps the atmosphere from escaping into space
  2. Causes the seasons to change
  3. Protects living organisms from harmful solar radiations
  4. Controls ocean currents

Answer: C) Protects living organisms from harmful solar radiations

Answer these questions selecting the appropriate option given below:

  1. Both A and R are factually correct, and R provides the precise logical explanation for A.
  2. A is true and R is also true, but R does not logically justify or clarify A.
  3. Assertion A holds true; however, the reason given in R is factually incorrect.
  4. Assertion A is not valid, but the statement in Reason R is accurate.

Assertion (A): Salt is a solute and water is a solvent in saltwater.

Reason (R): A solute is the substance that is present in a smaller amount and gets dissolved in the solvent.

Answer: a). Both A and R are factually correct, and R provides the precise logical explanation for A.

Assertion (A): Flowers that have both male and female reproductive organs are called bisexual flowers.

Reason (R): A flower has only one type of reproductive organ.

Answer: c). Assertion A holds true; however, the reason given in R is factually incorrect.

Science Class 8 SEE Model Paper 2

Section B

  1. Complete the following equation:

a) Water → Hydrogen + ___________

b) Iron + Dilute hydrochloric acid → ____________ + Hydrogen gas

Answer:

a) Water → Hydrogen + Oxygen
b) Iron + Dilute hydrochloric acid → Iron(II) chloride (Ferrous chloride)+ Hydrogen gas

  1. State the Laws of Reflection of light.

OR

Draw the following: i) Concave mirror ii) Convex mirror iii) Concave lens iv) Convex Lens

Answer:

Laws of Reflection:

  1. The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
  2. The angle of incidence is always equal to the angle of reflection.

Science Class 8 SEE Model Paper 2

Or

  1. Look at this food chain:

Grass → Grasshopper → Frog → Snake → Eagle

How would the removal of frogs affect grasshopper and snake populations? Why?

Answer:

Food Chain (Frog disappearance):

  • Grasshoppers: Their population will increase because there are no frogs to eat them.
  • Snakes: Their population will decrease because their primary food source (frogs) is gone.
  1. Imagine Earth’s magnetic field suddenly disappeared. Mention any 2 kinds of problems that could arise for life on Earth.

Answer:

Disappearance of Magnetic Field:

  1. Increased exposure to harmful solar radiation and cosmic rays.
  2. Potential loss of the atmosphere over time due to solar winds.

Science Class 8 SEE Model Paper 2

Section-C

  1. In a village, the temperature has been increasing and rainfall has become unpredictable over the past few years. What could be causing this change? Propose two adaptation strategies for the village under changing conditions.

OR

Define the following terms:

  1. Biosphere ii) Hydrosphere (iii) Greenhouse effect

Answer:

Cause: Climate change due to global warming, deforestation, or pollution.
Adaptation:

  • Rainwater harvesting
  • Planting drought-resistant crops

OR

i) Biosphere: The region of Earth that supports life.

ii) Hydrosphere: All water bodies on Earth.
iii) Greenhouse effect: Trapping of heat by gases like CO₂ in the atmosphere.

  1. What new substance is formed when a mixture of iron filings and sulphur powder is heated, and how is it different from the original mixture? Also, write the word equation for the reaction.

Answer:

Iron and Sulfur Reaction: A new substance called Iron Sulphide is formed. It is different because it is a compound with fixed properties and cannot be separated by a magnet, unlike the original mixture.

  • Equation: \text{Iron} + \text{Sulfur} \xrightarrow{\text{Heat}} \text{Iron Sulphide}%

Science Class 8 SEE Model Paper 2

Object A: mass = 200 g, volume = 40 cm³.

Object B: mass = 240 g, volume = 60 cm³.

Compute the densities and identify the denser object.

Answer:

Density of A = Mass / Volume = 200 g / 40 cm³ = 5 g/cm³

Density of B = Mass / Volume = 240 g / 60 cm³ = 4 g/cm³With a density of 5 g/cm³, object A is denser than object B at 4 g/cm³.

  1. In the given figure, the cap of a sketch pen is placed in front of three types of mirrors. Match each image with the correct mirror:
Science Class 8 SEE Model Paper 2

Image Mirror

(a) Concave Mirror

(b) Plane Mirror

(c) Convex Mirror

Answer:

  1. c
  2. a
  3. b
  1. What is Green Revolution? Mention any 2 negative impacts of over use of synthetic fertilizers and pesticides.

Answer:

Green Revolution: A period of significant increase in agricultural production through high-yield seeds and chemicals.

  • Negative 1: Soil degradation/loss of fertility.
  • Negative 2: Water pollution and harm to beneficial insects.

Science Class 8 SEE Model Paper 2

Section-D

  1. What is compound? List two compounds composed entirely of nonmetals and describe one application for each. Name the elements present in magnesium oxide.

Answer:

Compounds: A compound results from the chemical bonding of two or more elements.

  • Non-metal compounds:

1. Water (Used for drinking/cleaning).

2. Carbon Dioxide (Used in fire extinguishers).

  • Magnesium Oxide elements: Magnesium and Oxygen.

a) Describe a method to find the volume of irregularly shaped objects.

b) A stone sculpture weighs 225 g and has a volume of 90 cm3. Find its density and determine if it will float or sink in water.

Answer:

a) Activity: Use the water displacement method using a measuring cylinder.

b) Stone Calculation: Density = 225g/90cm3 = 2.5 g/cm3. Since this is greater than the density of water (1 g/cm3), the stone will sink.

a) What recurring natural events form the basis for a: (i) Day (ii) Month (iii) Year?

b) Define the following: i) Gibbous phase ii) Crescent phase

Answer:

a)
(i) Day – Rotation of Earth
(ii) Month – Moon’s revolution around Earth
(iii) Year – Earth’s revolution around Sun

b)
Gibbous phase: More than half of the Moon is lit.
Crescent phase: Less than half of the Moon is lit.

  1. Meena went to a science centre where she saw three different curved mirrors displayed side by side.
  • In the first mirror, her face appeared larger than normal when she stood close.
  • In the second mirror, her entire body looked upside down when she stepped back a little.
  • In the third mirror, her image always looked smaller, no matter how close or far she stood.

Curious, she asked a guide why her reflection looked different in each mirror. The guide explained that these were spherical mirrors that follow the laws of reflection, and the shape of each mirror changes how the image looks.

(i) Name the type of mirror in which Meena saw her face enlarged when she stood close.

(ii) Which mirror made her whole body appear upside down when she moved back?

(iii) In which mirror did her image always look smaller and upright regardless of her distance?

(iv) Mention one use of third mirror.

Answer:

(i) Concave Mirror (enlarged image when close).

(ii) Concave Mirror (upside down/real image when moved back).

(iii) Convex Mirror (always smaller and upright).

(iv) Use of Convex Mirror: Rear-view mirrors in vehicles.

Science Class 8 SEE Model Paper 2

  1. During an ecology trip, students observed a forest area where decomposers like fungi and insects were almost absent due to heavy use of fungicides. Over time, the forest floor became cluttered with dead leaves, fallen trees, and animal remains. The plants in the area began to look weak, and the number of herbivores seen that season was lower than usual.

(i) Mention why the buildup of dead plant and animal matter occurred in this forest.

(ii) Mention one consequence of the absence of decomposers.

(iii) Why did the plants in the area begin to look weak?

(iv) Give reason why the number of herbivores decrease in that season.

Answer:

(i) Buildup: Due to the absence of decomposers (fungi/insects) to break them down.

(ii) Consequence: Nutrients are not returned to the soil, leading to poor soil quality.

(iii) Weak plants: They lacked essential nutrients typically recycled by decomposers. (iv) Herbivore decrease: Weak plants provided less nutritious food, leading to a population decline.

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