Science Olympiad Previous Year Questions - 3 | Science Olympiad for Class 5 PDF Download

Ans: (d)
The rule followed is, (8×5)−(4×3)=40−12=28
(7×12)−(8×9)=84−72=12
∴ (5×5)−(6 × missing number) = 19 ⇒ 6 × Missing number = 25−19 = 6 ⇒ Missing number = 1

Ans: (a)
The rule followed is, (3×3)+(4×4)=9+16=25
(7×7)+(8×8)=49+64=113
∴(6×6)+(8×8)=36+64=100

Ans: (b)

• To solve this, we need to rearrange the letters E, A, M, G, D, A.
• The correct arrangement that forms a meaningful word is "GAMADA".
• By following the order in option (b) which is 5, 6, 3, 2, 4, 1, we get the letters in the sequence: D, A, M, E, G, A.
• This sequence spells "GAMADA", which is a valid word.

Ans: (a)
The pattern repeats itself after every 4th figure.

Ans: (a)

• The pattern involves a sequence where each number is derived from the previous one by a specific rule.
• To find the missing number, we can observe the differences between consecutive numbers: 23 - 9 = 14, 51 - 23 = 28, 107 - 51 = 56.
• The differences themselves are doubling: 14, 28 (14*2), 56 (28*2).
• Continuing this pattern, the next difference should be 56 * 2 = 112, so 107 + 112 = 219.
• Thus, the missing number is 219, which fits perfectly into the sequence.

Ans: (c)

• The question asks to identify the odd one out among the given options.
• Each group of letters consists of three letters, but they follow different patterns.
• In options (a), (b), and (d), the letters are in consecutive alphabetical order (G-H-I, K-L-M, M-N-O), while option (c) (T-V-W) skips a letter (U).
• Thus, option (c) is the odd one out because it does not follow the same pattern of consecutive letters.

Ans: (c)

Ans: B
The new word formed is, OMISECOMPR So, seventh letter from the right end is S.

Ans: (b)

Ans: (c)

• Oxides of nitrogen and sulfur are pollutants that can form when fossil fuels are burned.
• When these oxides mix with water vapor in the air, they create acidic compounds.
• This process results in acid rain, which can harm ecosystems, buildings, and water sources.
• Acid rain is a significant environmental issue, affecting both natural and human-made structures.

Ans: (d)
1 is stomach. The food from the food pipe enters stomach and gets digested in small intestine.

Ans: (a)
Sensory nerves pass through the spinal cord and carry messages of the body to the brain while motor nerves carry messages back from the brain to the body

Ans: (b)

• The correct answer is (b) Linen, Cotton, Jute because these are all natural fibers, while Silk, Rayon, and Nylon in option (a) are different types of fibers. Linen, Cotton, and Jute are all derived from plants, making them similar, while the others are not.
• In option (c), Shorts, Frock, and Cardigan are all types of clothing, and in option (d), Cotton, Wool, and Fur are all materials used in textiles.
• Thus, option (b) stands out as it contains fibers from different sources, making it the odd one out.

Ans: (c)

• The correct answer is Glucose (Solute), Water (Solvent). In a glucose solution, glucose is the substance that is dissolved, making it the solute, while water is the liquid that dissolves the solute, making it the solvent.
• This means that when you mix glucose with water, the glucose particles spread out in the water, creating a solution.
• Understanding the roles of solute and solvent is essential in chemistry, as it helps in identifying how substances interact in solutions.
• In this case, glucose is the main ingredient that provides the sweet taste, while water is the medium that carries it.

Ans: (c)
Oxygen is needed for respiration and burning. Carbon dioxide is required by plants for the process of photosynthesis.

Ans: (d)

• The question asks for the correct match between festivals and their associated moon phases.
• Eid-ul-Fitr is celebrated on the sighting of the Crescent Moon, while Diwali is linked to the New Moon.
• Karva Chauth is celebrated on the Full Moon, which is not correct in this context.
• Thus, the correct answer is Both A and B, as both Eid-ul-Fitr and Diwali are correctly matched with their respective moon phases.

Ans: (d)

• Immiscible liquids are those that do not mix together. In this case, water and refined oil do not combine, forming separate layers instead.
• On the other hand, water and mango juice, water and milk, and water and vinegar can mix well, creating a uniform solution.
• This property is due to the different polarities of the liquids; water is polar, while refined oil is non-polar.
• Thus, the correct answer is (d) Water and refined oil, as they are the only pair that remains separate.

Ans: (b)
Astronauts use radios to communicate because sound does not travel in vacuum.

Ans: (c)

• Electric fan converts electrical energy into mechanical energy, which helps it to rotate and provide airflow.
• Battery changes chemical energy into electrical energy to power devices.
• Television transforms electrical energy into light and sound energy to display images and produce sound.
• Photosynthesis is the process where light energy is converted into chemical energy by plants.

Ans: (b)
The presence of undesirable substances in water is called water pollution.

Ans: (b)
W is inner core, X is outer core, Y is mantle and Z is crust. Surface of Y is called crust, W is a solid layer while X is a liquid layer. Layer Y makes up most of the total Earth’s volume.

Ans: (b)

• Digestion of food primarily occurs in the small intestine, where nutrients are absorbed into the bloodstream.
• The other options are incorrect: night blindness is related to a lack of vitamin A, not potassium.
• Adults typically have 12 molars, not 8, and polio is caused by a virus, not bacteria.
• Thus, option (b) is the only correct statement regarding the digestion process.

Ans: (c)

• The analogy compares a floating plant with Duckweed, which is a type of floating plant.
• We need to find a submerged plant that corresponds to the analogy.
• Tape grass is a well-known submerged plant, while the other options are not primarily submerged.
• Thus, the correct answer is Tape grass, which fits the analogy perfectly.

Ans: (a)
The part labeled as S is Skull, X is cerebrum, Y is cerebellum, and Z is spinal cord.

Ans: (b)
Diseases which can spread from one person to another are known as communicable diseases while diseases which don’t spread from one person to another person is known as noncommunicable diseases.

Ans: (b)
Vitamins and minerals help the body to carry out metabolic reactions.

Ans: (b)

• The question asks for the part of the leaf that connects it to the stem, known as the petiole.
• When we unscramble the letters in option (b) LTSAK, we get STALK, which is another term for the petiole.
• Options (a), (c), and (d) do not unscramble to any relevant term related to the leaf structure.
• Thus, the correct answer is (b) LTSAK, as it correctly identifies the part of the leaf that attaches to the stem.

Ans: (a)

• Explanation: The statement about the cornea is incorrect because the cornea is not a layer of light-sensitive receptors; it is a transparent layer that covers the front of the eye. It helps to focus light but does not contain receptors that send messages to the brain. The light-sensitive receptors are actually located in the retina, which is at the back of the eye.
• The other statements about the cerebrum, brainstem parts, and outer ear are accurate.

Ans: (d)

• The digestive process begins in the Mouth, where food is chewed and mixed with saliva.
• Next, food travels down the Oesophagus to reach the Stomach, where it is further broken down.
• From the Stomach, the food moves into the Small intestine for nutrient absorption.
• After the Small intestine, the remaining waste goes to the Large intestine and finally exits through the Anus.

Ans: (b)

• Rabi crops are typically sown in the winter and harvested in the spring, while kharif crops are sown with the onset of the monsoon and harvested in the autumn.
• In this case, wheat is a rabi crop, and soybean is a kharif crop, making option (b) the correct pairing.
• Other options either pair two rabi crops or two kharif crops, which do not meet the requirement of one of each type.
• Thus, the correct answer is (b) Wheat : Soybean.

Ans: (c)

• Pelicans are known for their unique characteristics. They lay eggs, which is a common trait among birds.
• They possess a beak, which is essential for catching fish, their primary food source.
• However, their body is not covered with scales; instead, it is covered with feathers.
• Pelicans have webbed feet that assist them in swimming efficiently.

Ans: (a)

• Roots of sweet potato play a crucial role in the plant's survival.
• They store food for the plant, which is essential for growth.
• Additionally, they absorb water and mineral salts from the soil, which are vital for the plant's health.
• While roots do transport nutrients, they do not only send them to the leaves, making option (a) the correct choice.

Ans: (b)
As air can be compressed and takes up the volume of container, its final volume in the jar will be  500 mL.

Ans: (a)

• Bharatanatyam is a classical dance that originated in Tamil Nadu, making option (a) the correct match.
• Option (b) incorrectly states that Kuchipudi comes from Maharashtra, while it actually originates from Andhra Pradesh.
• Option (c) misplaces Kathakali, which is from Kerala, not Odisha.
• Option (d) incorrectly associates Odissi with Kerala, when it is actually from Odisha.

Ans: (a)

• Topsoil is the uppermost layer of soil and is known for its richness in humus, which is organic matter that provides nutrients to plants.
• The Subsoil lies beneath the topsoil and contains less organic material.
• Bedrock is the solid rock layer beneath the soil and does not contain humus.
• The C horizon consists of weathered rock and minerals, but it is not rich in humus either.

Ans: (c)

• Sedimentation is the process where heavier particles settle down at the bottom of a liquid.
• This occurs due to the force of gravity acting on the particles, allowing them to separate from the liquid.
• In contrast, filtration involves passing a mixture through a filter to separate solids from liquids.
• Condensation refers to the process of gas turning into liquid, while distillation is a method of separating components based on different boiling points.

Ans: (d)

• Disaster management involves various organizations that help in planning and responding to emergencies.
• The National Cadet Corps (NCC) contributes by training youth in disaster response.
• The World Health Organization (WHO) plays a crucial role in health-related emergencies.
• The Red Cross Society is well-known for its humanitarian efforts during disasters.
• Therefore, the correct answer is All of these as all mentioned organizations are involved in disaster management.

Ans: (c)
Crown is the visible part of a tooth which is present above the gum.

Ans: (b)

• The ball rolls due to an initial push, but it doesn't keep moving forever.
• It eventually stops because of frictional force, which is the resistance between the ball and the ground.
• Friction slows down the ball and brings it to a stop.
• Other forces like gravitational or muscular forces do not directly cause the ball to stop rolling on the ground.

Ans: (b)

• Statement 1 is correct because a physical change, like melting or boiling, does not change what the substance is made of.
• Statement 2 is also correct as a chemical change, such as rusting or burning, creates a new substance with different properties.
• However, statement 2 does not explain statement 1 because they describe different types of changes.
• Thus, both statements are true, but the second does not clarify the first.

Ans: (b)

• Earth's axis is tilted at an angle of 23.5°. This tilt is crucial because it affects the seasons we experience.
• The tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to changes in temperature and weather patterns.
• Understanding this angle helps explain why we have summer and winter in different hemispheres at different times.
• Other options like 25.3°, 22.5°, and 25.5° are incorrect and do not represent the actual tilt of the Earth's axis.

Ans: (c)

• Many substances can dissolve in water, which is why it is often called a universal solvent.
• As temperature increases, the solubility of most solids in water tends to decrease, while the solubility of gases generally decreases.
• This means that while some things dissolve well in water, not all do, especially when it gets warmer.
• Thus, option (c) is the correct statement regarding the solubility of substances in water.

Ans: (a)
Air is necessary for burning

Ans: (a)

• Rabi crops are sown in winter and harvested in spring, while kharif crops are sown in the monsoon and harvested in autumn.
• Among the options, gram is primarily a rabi crop, whereas soybean, groundnut, and maize are kharif crops.
• This makes gram the odd one out as it does not belong to the kharif category.
• Thus, the correct answer is (a) gram.

Ans: (c)
The label I is respiration and label II is carbon dioxide. During photosynthesis in plants, oxygen is released which is taken in by human beings and animals for respiration. They in turn release carbon dioxide needed for photosynthesis by plants.

Ans: (a)
Kinetic energy will be maximum at point 1 as the ride is in upward motion.

Ans: (a)
Shadow in option (a) is most likely the shadow formed on the screen.

Ans: (a)
Planet ‘c’ is Jupiter, which is the largest planet in our solar system.

Ans: (d)
S is most likely to be Hiptage.