Science Olympiad Model Test Paper - 3 | Science Olympiad Class 4 PDF Download

Ans: (a)
The day before yesterday was Thursday. So today is Saturday and the day after tomorrow will be Monday.

Ans: (c)
There are 12 triangles in the given figure.

Ans: (b)

• Raman's father’s birthday is after 6th November and before 10th November. This means it can only be 7th November or 8th November.
• His father remembers that his birthday is after 3rd November and before 8th November, which means it can only be 4th November, 5th November, 6th November, or 7th November.
• Combining both statements, the only date that fits is 7th November.
• Thus, the date of Raman’s father’s birthday is 7th November.

Ans: (c)
So, Hema is facing towards west direction now.

Ans: (d)

• To find the total number of students in the class, we can use Anamika's ranks.
• She is ranked 13th from the top, which means there are 12 students above her.
• She is also ranked 9th from the bottom, indicating there are 8 students below her.
• So, the total number of students is 12 (above) + 1 (Anamika) + 8 (below) = 21.

Ans: (d)
Crop rotation and afforestation are methods of soil conservation.

Ans: (d)
The bed rock breaks to form parent material which further breaks to form sub-soil and then top soil.

Ans: (b)
Cactus is a desert plant and grows best in sandy soil.

Ans: (a)
The Earth’s core is full of hot liquid which is  made up of nickel and iron. This is called magma.

Ans: (b)
The Great Wall of China is made up by cutting rocks on mountains.

Ans: (b)
Hilly regions are abundant and rich in water absorbing clay soil. 

Ans: (d)
Bed rock is made up of solid and hard rock. So, delicate plant roots are not able to penetrate this layer of the soil.

Ans: (a)
These things are used as base food for all cattles.

Ans: (d)

Afforestation is the process of planting many trees in an area to increase the green cover of the place.

Ans: (D)

• Dengue is caused by a virus, not a fungus. The correct causal microbe for dengue is the dengue virus, which is transmitted by mosquitoes.
•  Typhoid is correctly linked to bacteria, particularly Salmonella typhi.
• Malaria is accurately associated with a protozoa, specifically the Plasmodium species.
• Measles is correctly matched with a virus, as it is caused by the measles virus.

Ans: (b)

• Plants require specific raw materials to produce their own food through a process called photosynthesis.
• The main raw materials include carbon dioxide, water, and sunlight.
• In this case, option (b) includes the correct combination of these essential materials.
• Understanding the role of these materials is crucial for recognizing how plants sustain themselves and contribute to the ecosystem.

Ans: (b)
Lava escapes through volcano.

Ans: (b)

• All birds lay eggs is true; it's a characteristic of birds.
• All birds can swim is NOT true; not all birds are capable of swimming.
• All birds have skeletons is true; they have a skeletal structure.
• All birds have two legs and a beak is also true; these are common features of birds.

Ans: (b)
Trees absorb harmful green house gases and therefore, control global warming.

Ans: (a)

• Evaporation is the process where water changes from a liquid to a gas, increasing the amount of water vapor in the air.
• This process occurs when the sun heats up water in rivers, lakes, and oceans.
• As water vapor rises, it contributes to the overall humidity in the atmosphere.
• Other options like precipitation and infiltration do not increase water vapor; they involve water returning to the surface or moving through the ground.

Ans: (a)
The bottom most layer of soil is the bed rock or the parent rock from which the soil of the region has been formed.

Ans: (b)

• The length of a day on a planet is determined by how long it takes to complete one full rotation on its axis.
• Each planet has a unique rotation speed, which means some spin faster than others.
• This difference in rotation speed leads to varying day lengths across the planets.
• For example, a planet that spins quickly will have shorter days compared to one that spins slowly.

Ans: (a)
The approx. age of the Earth is around 4.5 billion years.

Ans: (a)

• Preventing domestic sewage from entering water bodies helps maintain clean water sources, which is crucial for conservation.
• This method directly impacts the quality of water available for use, thus reducing waste.
• Other options do not effectively contribute to water conservation or may even lead to increased water usage.
• By focusing on keeping water bodies clean, we ensure that water resources are preserved for future generations.

Ans: (a)

• Milk is well-known for being a rich source of calcium, which is essential for strong bones and teeth.
• While water, soda water, and iced tea may have some minerals, they do not provide significant amounts of calcium.
• Including milk in your diet can help meet your daily calcium needs.
• Calcium is crucial for various bodily functions, including muscle contraction and nerve signaling.

Ans: (a)

• The letters "AOBBMO" can be rearranged to spell "Bamboo," which is a type of herb.
• Bamboo is known for its strength and flexibility, making it an excellent material for paper production.
• Other options do not correspond to any known herbs used for making paper.
• Thus, the correct answer is option (a) AOBBMO, which unscrambles to Bamboo.

Ans: (c)
The earliest human civilization was in Stone Age which used tools made up of rocks.

Ans: (a)
Horizon is the place where the earth and the sky appear to meet. Similarly, the layers of soil are not clearly marked. They appear to meet and merge when moving from one layer to the other. So, these layers have also been named as horizon.

Ans: (c)
Clay soil is dark red and humus-rich soil is dark in colour.

Ans: (a)
The base of all rocks is minerals. There is no rock which is not made up of minerals.

Ans: (a)
The increase in temperature is melting the icebergs and this has resulted in the rise in water level of the rivers.

Ans: (a)
Igneous rooks are formed by solidification of magma due to reduction in temperature.

Ans: (c)

• Statement (i): The gravitational force indeed acts on an object rolling down a slope, making this statement true.
• Statement (ii): A bottle-opener is not an inclined plane; it is a lever, so this statement is false.
• Statement (iii): When cutting paper, work is actually done because you are applying force to change the shape of the paper, making this statement false.
• Statement (iv): Shoes are designed with grooves to increase friction, which helps prevent slipping, making this statement true.
  Thus, the correct options are (i) and (iv), leading to the answer (c).

Ans: (c)
Basalt  is the most common rock found on Earth. Almost 28% of all rocks are basalt.

Ans: (d)
Marble is used for making buildings and sculptures. Obsidian is used for making sharp objects like knives and needles. Basalt is used for  constructing roads. Shale is used for making bricks, paints and other colouring material.