Science Olympiad Model Test Paper - 2 | Science Olympiad Class 6 PDF Download

Ans: (d)
The final shape will have four triangular shapes with their vertices pointing inward. Only option 4 satisfies the condition.

Ans: (d)

Figure in the question is made of some numbers. We have to make its mirror image. The property of mirror image is to flip it horizontally. Figure D is only an image that is horizontal of the image given in the question.

Ans: (b)

B and D are siblings, so A and C are husband and wife.

M is the paternal uncle of D and hence, the brother of D's father, who is A.

Ans: (c)

• The other options follow a pattern where each letter skips one alphabet in between.
• For example, in RTW: R (skips S) to T (skips U) to W.
• However, ACE does not follow this pattern as it goes sequentially without skipping any letters.
• Thus, ACE is the odd one out.

Ans: (c)

• To find the relationship: For 346, we calculate (3 x 4 x 6) ÷ 9 = 72 ÷ 9 = 8.
• Now applying the same method: For 592, we compute (5 x 9 x 2) ÷ 9 = 90 ÷ 9 = 10.
• Thus, the answer is 10, which shows how the numbers are related through multiplication and division.

Ans: (d)

This is a net of pentagonal pyramid, and in this shape, there is no opposite face.

Ans: (c)

• P is identified as the father of Q.
• R is the daughter of S, which means S is a parent.
• Since P is the father of Q and R is S's daughter, it indicates that S is married to P.
• Thus, S is the wife of P.

Ans: (b)

• The correct order is based on how these elements are structured in writing. A Book contains Chapters, which are made up of Paragraphs, and each Paragraph consists of Sentences. Thus, the sequence is: Book (3), Chapter (2), Paragraph (5), Sentence (4), and finally Word (1).
• This gives us the sequence: 3, 2, 5, 4, 1, which corresponds to option (b).

Ans: (b)

• The original expression is 5 + 14 - 2 x 3.
• Substituting the symbols, we get: 5 x 14 + 2 - 3.
• Now, calculate: 5 x 14 = 70, then add 2 to get 72, and finally subtract 3.
• This results in 72 - 3 = 69, which is incorrect. Let's correct it: 5 x 14 + 2 - 3 = 70 + 2 - 3 = 69.
• However, if we follow the operations correctly, we should have: 5 x 14 + 2 - 3 = 70 + 2 - 3 = 69.
• So, the correct answer is 32.

Ans: (c)

This is an alternating subtraction series in which 2 is subtracted twice, then 3 is subtracted once, then 2 is subtracted twice, and so on.

Ans: (c)

Glass is not a conductor, while copper wire, sea water, and graphite are conductors of electricity.  

Ans: (c)

At 4°C, the density of water is maximum.

Ans: (a)

When a body covers equal distance in equal interval of time, the motion of a body is called uniform motion. 

Ans: (c)

When an electrician repairs electric line, he wears rubber gloves as rubber is a bad conductor of electric current and prevents him from electric shock.  

Ans: (c)

Both the processes are chemical changes as the change cannot be reversed. 

Ans: (c)

• Friction is a force that opposes motion, which means it can slow down moving objects, confirming statement (i).
• A rough surface indeed creates more friction than a smooth one, supporting statement (ii).
• However, friction does not make it easier to slide heavy objects; it actually makes it harder, so statement (iii) is incorrect.
• Friction always acts against the direction of motion, which is true for statement (iv).

Ans: (b)

• Planets do not produce their own light; they reflect light from the Sun.
• The Sun is indeed the closest star to Earth and is the primary source of light for our planet.
• Glowworms and stars are both considered natural sources of light.
• Thus, all three statements (i), (ii), and (iii) are correct.

Ans: (b)

Since there is a difference in the size of the rice grains and the salt crystals, sieving is the best and the most convenient method to separate them.
Alternately, since rice is insoluble and salt is soluble in water the mixture may be added to water and then rice can be separated by filtration using a filter paper and then salt can be separated by evaporation.
However, this is not the best option.

Ans: (b)

Iron displaces copper from the sulphate solution leading to the formation of ferrous sulphate and copper.

CuSO₄ + Fe → FeSO₄ + Cu

The blue colour of the solution changes to pale green and there is a reddish-brown deposit of copper on the piece of iron.

This is a displacement reaction in which a more reactive metal displaces a less reactive metal from its salt solution.

Ans: (a)

• Wind energy is transformed into mechanical and electrical energy through the use of turbine blades and generators.
• This process involves the movement of air turning the blades, which then drives the generator to produce electricity.
• Wind energy is a renewable source, making it an important part of sustainable energy solutions.
• Understanding this conversion is crucial for harnessing wind power effectively.

Ans: (d)

• Statement I: Wood and plastic actually float in water, so this is incorrect.
• Statement II: A sponge is soft and can be easily compressed, making this statement false.
• Statement III: Hammering an iron object does indeed flatten it, which is true.
• Statement IV: If most light passes through a material, it is considered transparent, not translucent.

Thus, the incorrect statements are I, II, and IV, leading to the correct answer being option (d).

Ans: (c)

• Kerosene and water are two liquids that do not mix, which means they are immiscible.
• Filtration is used for separating solids from liquids, but since kerosene and water do not mix, they cannot be separated by filtration.
• Instead, a separating funnel is the appropriate tool to separate these two liquids.
• In contrast, the other options involve mixtures that can be effectively separated using filtration.

Ans: (b)

• In option (b), syrup is a liquid, while the other items (stone, chair, pencil) are solids. This makes syrup the odd one out.
• Understanding the states of matter is key: solids have a fixed shape, while liquids take the shape of their container.
• Thus, the correct identification of the odd one is based on the physical state of the substances listed.

Ans: (c)

• Alloys, air, and a sugar solution are classified as homogeneous mixtures because their components are evenly distributed and cannot be easily distinguished.
• On the other hand, the oil-water mixture, smoke, and mist are considered heterogeneous mixtures since their components can be seen and separated.
• This classification helps in understanding how different mixtures behave and interact.

Ans: (c)

• Dry leaves are less dense than water, which is why they float.
• The other options, like a key, coin, and iron nail, are denser than water, causing them to sink.
• This property of density explains why some objects float while others do not.
• In simple terms, if something is lighter than water, it will stay on top, like a dry leaf.

Ans: (c)

• Statement 1 is true because we cannot see clearly through oiled paper; it is not clear.
• Statement 2 is false because oiled paper is not transparent; it is actually translucent.
• Translucent means that light can pass through, but objects cannot be seen clearly.
• Thus, the correct option is that statement 1 is true, but statement 2 is false.

Ans: (b)
A freely suspended magnet always aligns in N-S direction having North Pole towards north and South Pole towards south.  

Ans: (b)

• Metals are known for being good conductors of electricity and heat.
• They are typically lustrous, meaning they have a shiny appearance.
• Most metals are solid at room temperature and are opaque, not allowing light to pass through.
• Thus, the correct combination of characteristics that metals exhibit is (i), (iii), (iv), and (v).

Ans: (d)

• Conversion of gas into liquid is known as condensation. This is the process where gas cools down and changes back to a liquid state.
• The other options are incorrect: evaporation refers to liquid turning into gas, freezing is the process of liquid becoming solid, and melting is when solid turns into liquid.
• Understanding these processes is important in studying states of matter and their transitions.

Ans: (b)

• Pea is actually a climber, which means it grows upwards using support.
• Watermelon, on the other hand, is correctly identified as a creeper because it spreads along the ground.
• The other options correctly match the types of roots and growth habits.
• Thus, option (b) is the incorrect match.

Ans: (b)

Presence of both moisture and oxygen is required for rusting of iron.

Rusting will not occur in the absence of any one or both of these conditions.

Ans: (a)

• Fruit peel and tea leaves are items that can break down naturally, making them biodegradable.
• The other items listed, such as used batteries, juice cans, DDT, used syringes, and ceramic bowls, do not decompose easily and are considered non-biodegradable.
• Thus, the correct answer is (i) and (iv) only.

Ans: (b)

Light always travels in a straight line. This property is called rectilinear propagation of light.  

Ans: (a)

• The relationship illustrates body coverings: a cuticle for the beetle and ant, feathers for the parakeet and flamingo, and a shell for the snail and clam.
• Each pair shares a similar type of covering, making option (a) the correct choice.
• In this case, the ant and flamingo both have a cuticle and feathers, while the clam and snail both have shells.
• This consistent pattern confirms that option (a) maintains the same relationship as the original example.

Ans: (c)

• In the event of a severe burn, it is crucial to take appropriate measures to promote healing and prevent infection.
• Using a wet compress made with baking soda can help soothe the area and reduce irritation.
• It is important to avoid pricking blisters, as they protect the underlying skin and help prevent infection.
• Immersing the burn in lukewarm water is not recommended for severe burns, as it may worsen the injury.

Ans: (c)

Inside the torch, two or more cells are placed with positive – negative – positive – negative terminals to power the torch, else with any other arrangement, it won't work. 

Ans: (a)

• Sweet pea has leaves that are modified into tendrils, which assist the plant in climbing.
• Lettuce is known for its leaves that serve as storage for extra food produced by the plant.
• This combination of plants matches the descriptions given for P and Q.
• Other options do not correctly match the characteristics described.

Ans: (b)
When a bar magnet is cut into two pieces, then each piece will have its own poles. 

Ans: (b)

• The Gateway of India was actually designed by British architect George Wittet, not Ustad Ahmad Lahauri.
• Qutub Minar is a famous monument that stands at a height of 73 meters and features a spiral staircase with 379 steps.
• The Sun Temple is uniquely designed to resemble a chariot of the Sun God, showcasing intricate architecture.
• The Taj Mahal is beautifully located on the banks of the Yamuna River, making it a stunning sight.

Ans: (a)

• Upon unscrambling, the letters in option a form the word MIMICRY.
• Mimicry is a survival strategy where one organism resembles another or an object to avoid being eaten by predators.
• This adaptation helps the mimicking organism to blend into its environment, making it less visible to threats.
• Thus, the correct identification of phenomenon X is MIMICRY.

Ans: (d)
We use woollen clothes in winter as woollen fibres trap a lot of air which is a poor conductor of heat and prevents the body heat from escaping.

Ans: (a)

• The reaction between vinegar and baking soda produces carbon dioxide gas.
• Carbon dioxide (CO₂) does not support combustion, which means it cannot keep a fire burning.
• When the matchstick flame was brought near the test tube, the carbon dioxide from the reaction extinguished the flame.
• This shows that CO₂ is effective in putting out fires, confirming that it does not support burning.

Ans: (d)

Petrol, kerosene and other petroleum products are separated by the process of fractional distillation using a fractional column. 

Ans: (d)

A weathercock shows the direction in which the air is moving at that place.

Ans: (a)

During night, Moon appears shining although it is not a luminous body because it reflects the sunlight.

Ans: (d)

• Cotton produces a similar odor to that of burning paper, just as wool emits a scent akin to burning hair.
• This analogy highlights the relationship between the materials and their respective burning smells.
• Understanding these associations helps in identifying the correct option.
• Thus, the answer is Cotton for the smell of burning paper.

Ans: (a)

• Cotton grows best in black deep soil.
• Cotton, jute, flax, hemp, coir and ramie are all fibres which are gained from plants.
• Fabric is made from yarn by either weaving or knitting.

Hence, the statements 1,2 and 3 are correct

• Alluvial soil is good for cotton as well.
• The spinning of fibres increases the strength of the yarn.

Hence, the statements 4 and 5 are incorrect

Ans: (c)

• X is root and it anchors the plant, absorbs water and stores food in plants like radish.
• Root is the first part that emerges during germination.

Ans: (d)

• Roots growing towards gravity is known as positive geotropism, which means they grow in the direction of gravitational pull.
• Hibernation refers to the reduced activity in animals during the winter months, allowing them to conserve energy.
• The other options do not correctly match the definitions provided in the sentences.
• Thus, the correct option is (d) as it accurately fills the blanks in the sentences.

Ans: (a)

• The continuous circulation of water between the land and the atmosphere is known as the water cycle. This phenomenon maintains the supply of water on land and is responsible for water being a renewable resource.
• Collecting and storing rainwater for use is called rainwater harvesting. The basic idea behind rainwater harvesting is "Catch water where it falls". Hence, rainwater from the terraces, drains etc. is directed towards the ground.
• Drought is a condition of extreme water shortage created when it does not rain in a region for a long period of time. Soil loses the water due to evaporation and transpiration, and the water table falls.

Hence, the correct match is:

Therefore, only option (a) is correct.

Ans: (d)

• The thermosphere is the uppermost layer of the atmosphere, and it should not be interchanged with the troposphere, which is the closest layer to Earth.
• The troposphere is correctly mentioned and does not need any changes.
• The mesosphere and stratosphere have distinct roles, and interchanging them would be incorrect.
• Thus, the statement that suggests interchanging the thermosphere and troposphere is the incorrect one.