Science Class 8 SEE Model Paper 1
Science Class 8 SEE Model Paper 1
Section A
- Diffusion in gases is faster than in liquids because:
a) Particles are bigger
b) Intermolecular force is stronger
c) Particles move freely and faster
d) Gases are heavier
Answer: c) Particles move freely and faster - Which of the following is a compound?
a) Air
b) Brass
c) Water
d) Soil
Answer: c) Water - How many days are there in a normal year according to the solar (Gregorian) calendar?
a) 360 days
b) 364 days
c) 365 days
d) 366 days
Answer: c) 365 days - Growing the same crop repeatedly, known as
a) Pisciculture
b) Sericulture
c) Monoculture
d) Apiculture
Answer: c) Monoculture
Science Class 8 SEE Model Paper 1
- Which forest have the largest mangrove forests in the world?
a) Gir forest
b) Sundarvan
c) Bandipur
d) Jim corbett
Answer: b) Sundarvan - Which of the following natural object helps us measure time period /days through its phases?
a) Moon
b) Mars
c) Sun
d) Earth
Answer: a) Moon - Hot air rises because:
a) Higher density
b) Lower density than cool air
c) More mass
d) Stronger gravity
Answer: b) Lower density than cool air - When the light is incident along the normal on the mirror, which of the following statements is true:
a) Angle of incidence is 90°
b) Angle of incidence is 0°
c) Angle of reflection is 90°
d) No reflection of light takes place in this case
Answer: b) Angle of incidence is 0° - Which of these is an example of geodiversity?
a) A variety of birds chirping in a forest.
b) Different landforms like mountains, valleys, and deserts.
c) Changing weather during monsoons.
d) Number of different types of fish in a pond.
Answer: b) Different landforms like mountains, valleys, and deserts. - What is one major reason Mars cannot currently support life like Earth?
a) It has too many volcanoes.
b) It is too close to the Sun.
c) It lacks a thick atmosphere and liquid water.
d) Its magnetic field is too strong.
Answer: c) It lacks a thick atmosphere and liquid water.
Science Class 8 SEE Model Paper 1
- In which of the following cases are all the examples correctly matched?
a) Elements — water, nitrogen, iron, air.
b) Uniform mixtures— minerals, seawater, bronze, air.
c) Pure substances— carbon dioxide, iron, oxygen, sugar.
d) Non-uniform mixtures — air, sand, brass, muddy water
Answer: c) Pure substances— carbon dioxide, iron, oxygen, sugar. - What do we obtain When electricity is passed through water?
a) Only hydrogen
b) Only oxygen
c) Hydrogen and oxygen gas
d) Only vapour
Answer: c) Hydrogen and oxygen gas - Image formed by a concave lens is always
a) Inverted and small in size
b) Erect and diminished in size.
c) Erect and Large in size.
d) Inverted and large in size
Answer: b) Erect and diminished in size. - Assertion: Air is a mixture.
Reason: A mixture is formed when two or more substances are mixed, without undergoing any chemical change.- Both A and R are factually correct, and R provides the precise logical explanation for A.
- A is true and R is also true, but R does not logically justify or clarify A.
- Assertion A holds true; however, the reason given in R is factually incorrect.
- Assertion A is not valid, but the statement in Reason R is accurate.
Answer: a) Both A and R are factually correct, and R provides the precise logical explanation for A.
- Assertion: Convex mirrors are preferred for observing the traffic behind us.
Reason: Convex mirrors provide a significantly larger view area than plane mirror.- Both A and R are factually correct, and R provides the precise logical explanation for A.
- A is true and R is also true, but R does not logically justify or clarify A.
- Assertion A holds true; however, the reason given in R is factually incorrect.
- Assertion A is not valid, but the statement in Reason R is accurate.
Answer: a) Both A and R are factually correct, and R provides the precise logical explanation for A.
Science Class 8 SEE Model Paper 1
Section B
- Some manmade satellites are sent by various countries in the orbit of earth. What this satellite called? In which way these satellites help us?
Answer: They are called artificial satellites. They help us in many ways, such as: Communication (TV, telephone, internet), Weather forecasting, Navigation (GPS), Spying/military, surveillance, Scientific research and space observation. - Complete the following equation:
a) Calcium hydroxide + Carbon dioxide →
b) Iron + Dilute hydrochloric acid →
Answer:
a) Calcium Carbonate (Chalk) + Water (or more accurately, Calcium Carbonate + Water)
The balanced reaction is: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
b) Iron Chloride + Hydrogen (or more accurately, Ferrous Chloride + Hydrogen)
Balanced Equation: Fe + 2HCl → FeCl₂ + H₂
- A student adds more sugar in water. At one stage sugar stops dissolving.
(a) Name the type of solution formed.
(b) Define solubility.
(c) Suggest one way to dissolve more sugar.
Answer:
(a) Type of solution: Saturated solution.
(b) Solubility is the maximum amount of a substance (solute) that can be dissolved in a fixed amount of solvent (like water) at a given temperature to form a saturated solution.
(c) To dissolve more sugar: we can heat the solution. The solubility of most solids increases with an increase in temperature. - Draw food chain showing four trophic level.
Answer:
A sample food chain with four trophic levels:
Illustrative food chain: Grass (producer) → Grasshopper (primary consumer) → Frog (secondary consumer) → Snake (tertiary consumer).
Science Class 8 SEE Model Paper 1
- i. Identify mirror used by dentist for inspecting teeth? Why?
- Write one property of image formed by such mirror.
Answer:
1) A dentist uses a concave mirror because it produces an enlarged image when held close.
2) The image is erect and magnified.
- Why potassium permanganate spread throughout water after some time as shown in picture?
Answer: This happens because of diffusion. The particles of potassium permanganate are constantly moving. They move from a region of high concentration (where the crystal was) to regions of low concentration (the rest of the water) and mix with the particles of water. This continuous movement causes the potassium permanganate to spread evenly throughout the water.
Science Class 8 SEE Model Paper 1
Section C
- Object A has a mass of 250 g and a volume of 50 cm³. Object B has a mass of 280 g and a volume of 70 cm³. Calculate the density of object A and object B. Which object is denser?
Answer:
Density of A = Mass / Volume = 250 g / 50 cm³ = 5 g/cm³
Density of B = Mass / Volume = 280 g / 70 cm³ = 4 g/cm³
Object A is denser (5 g/cm³) than object B (4 g/cm³).
Science Class 8 SEE Model Paper 1
- 0 0 @ 0 0 @ 0 represents sulphur
@ 0 @ @ @ @ represents iron
a) Is this a mixture or compound? Give reason
b) A magnet is brought near the above substance. What will happen? Why?
c) If heating the above substance, what will form?
Answer:
a) It is a mixture. The reason is that the symbols show sulphur and iron particles are simply intermingled and not chemically combined. Their individual properties can still be observed.
b) When a magnet is brought near the mixture, the iron filings will be attracted to the magnet. This is because iron is a magnetic material, and in a mixture, it retains its magnetic property.
c) If this mixture is heated strongly, the iron and sulphur will react chemically to form a new compound called Iron Sulphide.
- Identify A and B.
- Which parts of flower produce Pollen grains?
- What is Pollination?
Answer:
a) Based on a typical flower diagram:
– A is the Anther (part of the stamen).
– B is the Ovule (part of the ovary).
b) The Anther (A) produces pollen grains.
c) Pollination is the process of transfer of pollen grains from the anther of a flower to the stigma of the same or another flower.
Science Class 8 SEE Model Paper 1
- Look at the pictures of the Moon in the given figure and answer the following questions. Write the correct panel number corresponding to the phases of the Moon shown in the pictures below
| Picture label (e.g. A, B, C, etc.) | Phase of Moon |
| Three days after New Moon | |
| Full Moon | |
| Three days after Full Moon | |
| A Week after Full Moon | |
| Day of New Moon |
Answer:
| Picture label (e.g. A, B, C, etc.) | Phase of Moon |
| D | Three days after New Moon |
| E | Full Moon |
| A | Three days after Full Moon |
| C | A Week after Full Moon |
| B | Day of New Moon |
- label A, B, C and D
- Which planet is hottest planet and why?
Answer:
a) A: Crust, B: Mantle, C: Outer Core, D: Inner Core.
b) Venus (B) is the hottest planet in our solar system. This is because it has a thick atmosphere mainly composed of carbon dioxide, which creates a runaway greenhouse effect, trapping the sun’s heat.
Science Class 8 SEE Model Paper 1
Section D
- Laxmi was performing an activity in the science lab. She took a small stone and a piece of wood of the same size. When she placed them in a bucket of water, she observed that the stone sank to the bottom while the wooden piece floated on the surface. Her teacher explained that objects float or sink in water depending on their density. Density is the mass of a substance per unit volume.
- The stone sank in water because:
A) It is lighter
B) Its density is less than water
C) Its density is more than water
D) It dissolved in water
Answer: C) Its density is more than water
- The wooden piece floated because:
A) It has no mass
B) Its density is less than water
C) It is heavier
D) It reacts with water
Answer: B) Its density is less than water - If two objects have the same volume but different masses, then:
A) Their densities are same
B) The object with more mass has more density
C) Both will float
D) Density cannot be compared
Answer: B) The object with more mass has more density - The SI unit of density is:
A) kg
B) m³
C) kg/m³
D) gm
Answer: C) kg/m³
Science Class 8 SEE Model Paper 1
- Harsh went to a funfair with her friends. At one stall, she saw a large mirror in which her face appeared bigger and upright when she stood close to it. At another stall, she noticed a different mirror in which her image appeared smaller and inverted when she stood far from it. The shopkeeper told her that these were different types of spherical mirrors used in daily life.
- The mirror in which Harsh saw her face bigger and upright when standing close is:
- Plane mirror
- Convex mirror
- Concave mirror
- Glass slab
Answer: C) Concave mirror
- The mirror that formed a smaller and inverted image when she stood far away is:
- Convex mirror
- Concave mirror
- Plane mirror
- Transparent sheet
Answer: B) Concave mirror
- Convex mirrors are used as rear-view mirrors in vehicles because:
A) They form inverted images
B) They form magnified images
C) These offer a broader field of view.
D) They absorb light
Answer: C) These offer a broader field of view.
- Which of the following statements is correct?
A) Convex mirrors always form real images
B) Both real and virtual images can be formed by concave mirrors.
C) Plane mirrors form inverted images
D) Convex mirrors form enlarged images
Answer: B) Both real and virtual images can be formed by concave mirrors.
Science Class 8 SEE Model Paper 1
Section E
- Why is the sun considered the ultimate source of energy for all living organism?
- Why are producers always placed at the beginning of the food chain?
- Write two biotic and two abiotic components found in pond ecosystem.
Answer:
- The Sun is the ultimate source of energy because all living organisms depend on it directly or indirectly. Plants (producers) trap solar energy to make food through photosynthesis. All other organisms (consumers) get this energy by eating plants or eating other animals that have eaten plants. Without the sun, there would be no energy to start this cycle.
- Producers are always placed at the beginning of a food chain because they are the only organisms that can convert solar energy into chemical energy (food). They are the autotrophs that manufacture their own food, which then becomes the source of energy and matter for all other organisms (heterotrophs) in the chain.
- In a pond ecosystem:
Biotic components (living): Fish, Aquatic plants (like algae and Hydrilla), frogs, insects.
Abiotic components (non-living): Water, Sunlight, soil, oxygen dissolved in water.
- An ecosystem cannot function with only producers because matter and nutrients would not be recycled. When producers die, the decomposers break down their dead remains and release nutrients back into the soil/water. These nutrients are then used again by the producers. Without decomposers, nutrients would be locked up in dead bodies, and producers would eventually run out of raw materials. Consumers are also part of the energy flow.
- Identify x, y and z (states of matter)?
- What will happen when Z is heated?
- Write name of process when Z is converted into Y.
- On the basis of above diagram , differentiate between X ,Y, and Z.
Answer:
a) Based on the typical diagram:
X: Gas, Y: Liquid, Z: Solid.
b) Heating Z: It expands and may undergo a phase change (Melting).
c) The transition of a solid (Z) to a liquid (Y) is known as melting.
d) Differentiation between X (Solid), Y (Liquid), and Z (Gas):
| Feature | X (Gas) | Y (Liquid) | Z (Solid) |
| Shape | No definite shape, fills the container | No definite shape, takes the shape of the container | Definite shape |
| Volume | No definite volume | Definite volume | Definite volume |
| Particle Arrangement | Far apart, move randomly | Loosely packed, can slide over each other | Closely packed in a regular pattern |
| Compressibility | Highly compressible | Very low | Negligible |
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