Science Olympiad Model Test Paper - 2 | Science Olympiad Class 4 PDF Download

Ans: (b)

• The question presents a series of name changes among animals.
• Initially, the Lion is known as the king of the jungle.
• Since Lion is now called Tiger, the Tiger takes on the role of the king.
• Thus, the correct answer is Tiger.

Ans: (b)
Except Q all lines have line of symmetry.

Ans: (a)
If someone is thirsty he will drink water but water is called light.

Ans: (d)
Order of cakes from the largest to the smallest: is Mango, Chocolate, Vanilla, Coconut

Ans: (b)
The pattern is,

Ans: (c)

• Air is essential for combustion, which means it is necessary for burning to occur. Without air, fire cannot exist.
• The activity likely demonstrates how a flame requires oxygen, a component of air, to keep burning.
• While other options mention properties of air, they do not directly relate to the concept of burning.
• Thus, the correct answer is that air is needed for burning.

Ans: (c)
Growing trees does not increase quantity of useful gases in air, it maintains the correct composition of gases in the air.

Ans: (c)
Boiling water is the best way to purify water obtained from tap.

Ans: (b)
They together comprise around 99% of the air around us.

Ans: (c)
Chlorine tablets are put in water tanks to make the water potable and fit for drinking.

Ans: (b)
Condensation is reducing the temperature to change the state of matter from gases to liquids.

Ans: (b)
It helps in the recycling of water from the Earth to the sky.

Ans: (c)

• To preserve juice (X) and peas (Y) effectively, the best methods are canning and freezing.
• Canning involves sealing the juice in airtight containers, which prevents spoilage.
• Freezing peas helps maintain their taste and nutritional value for a longer time.
• Other methods like baking or drying may not be suitable for preserving these items without affecting their flavor.

Ans: (c)
Water pollution is very dangerous and depleting the already low reserves of potable water on the earth.

Ans: (c)
Heavy rainfall  increases supply of water. Rest all have depleted local water resources.

Ans: (c)

• Sheep and goats are mammals that give birth to live young, just like rats and bears.
• While sheep and goats are known for chewing the cud, rats and bears also share the characteristic of giving birth to babies.
• Thus, the commonality among all these animals is that they all give birth to babies.
• Other options do not apply to all groups, making option (c) the correct choice.

Ans: (a)
Agricultural products are not a major source of ground water contamination because, they contain fertilisers and pesticides and they are washed away in the water.

Ans: (d)
Pure water is not blue, its colourless. Tap water is best purified by boiling. 

Ans: (a)
Boiling water is the best way to purify water obtained from tap.

Ans: (b)

• Tram is a vehicle that operates on tracks and is typically found in urban areas.
• Unlike personal vehicles, we do not own trams; instead, we pay a fare to use them.
• Trams are designed to run on rails that are often integrated into city streets.
• Other options like cable cars and aeroplanes do not fit the description of running on rail tracks laid on roads.

Ans: (a)

• Hydro energy refers to the energy generated from the movement of water, particularly from rivers and dams.
• This energy is harnessed to produce electricity, making it a renewable and sustainable source.
• Other options incorrectly describe mechanical devices or energy sources, such as a nutcracker being a lever or geothermal energy being derived from the Sun.
• Thus, the correct statement is that energy from flowing water is indeed called hydro energy.

Ans: (b)

• Earth’s axis is indeed tilted at 23.5°, which is crucial for the changing seasons.
• Option (a) is incorrect because lava is actually molten rock that has erupted onto the Earth's surface, not inside it.
• Option (c) is not accurate as Pongal is a harvest festival, not directly linked to the Moon's movement.
• Option (d) is incorrect since Earth rotates from West to East, not the other way around.

Ans: (c)

• Dodder plants are unique because they cannot make their own food through photosynthesis.
• Instead, they attach themselves to other plants and absorb nutrients from them.
• This means they depend on other plants for their survival, which is why option (c) is correct.
• Options (a), (b), and (d) are incorrect as they misrepresent the dodder plant's feeding habits.

Ans: (d)

• Butterfly is the correct answer because it is not a parasite; it is an insect that feeds on nectar from flowers.
• In contrast, Louse, Tapeworm, and Hookworm are all organisms that live on or inside a host and derive nutrients at the host's expense.
• Parasites can cause harm to their hosts, while butterflies do not harm plants or animals in this way.
• Thus, the butterfly stands out as the only option that does not fit the definition of a parasite.

Ans: (a)

• Understanding the relationship: The question compares a type of organism (Bacteria) with a disease (Pneumonia) it causes. Similarly, we need to find a disease caused by Protozoa.
• Identifying the correct disease: Among the options, Sleeping sickness is caused by a Protozoan parasite, while the others are not.
• Conclusion: Therefore, the correct answer is (a) Sleeping sickness, as it maintains the same relationship as Bacteria to Pneumonia.

Ans: (a)

• The statement that "the hot molten magma present inside the Earth is called lava" is incorrect because lava refers to magma that has erupted onto the Earth's surface. Inside the Earth, it is still called magma.
• The other statements are correct: weathering is indeed the process of breaking down rocks, minerals like copper and zinc are extracted from rocks, and sandstone forms from sand grains over time.
• Understanding these terms is crucial in geology, as they describe different processes and materials found in the Earth's structure.

Ans: (d)

• Thresher is the correct tool for separating grains from stalks. It works by beating the harvested crops to remove the grains.
• A harvester is used for cutting and gathering crops, not for separating grains.
• A winnower is used to separate chaff from grain after threshing, but it does not perform the initial separation.
• A sickle is a hand tool for cutting crops, not for separating grains.

Ans: (a)

• Alluvial soil is known for being very fertile and is commonly used in agriculture.
• This type of soil is typically found in areas near rivers or lakes, where sediment is deposited.
• Other options like desert soil, black soil, and mountain soil do not fit the description of being both fertile and found near water bodies.
• Thus, the correct match is Alluvial soil.

Ans: (b)

• Roots are the part of the plant that grow underground.
• They play a crucial role in absorbing water and essential minerals from the soil.
• The roots anchor the plant and help it stay stable while also providing nutrients.
• Without roots, plants would struggle to survive as they wouldn't get the necessary resources.

Ans: (a)
Vehicles play minimum role in increasing water and soil pollution.

Ans: (a)
The natural salts provide nutrients to aquatic life. Even human beings get iodine from sea water only.

Ans: (a)
Hydroelectricity (using water) is a cheap, environment friendly method of generating electricity as compared to thermal electricity (using coal).

Ans: (b)
The Reverse Osmosis (RO) system are used for purification of domestic water also now-a-days.

Ans: (a)
The waste disposed-off by industries pollute water and the fish consume this polluted water and die.

Ans: (d)
Acid rain destroys metal products and causes harmful skin diseases to animals and destroys plants.