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

Ans: (b)

• The question asks for a missing number based on a specific rule applied in rows or columns.
• To solve this, you need to identify the pattern in the numbers provided.
• After analyzing the numbers, you will find that 21 fits the pattern correctly.
• Thus, the answer is 21, as it maintains the consistency of the rule applied.

Ans: (c)
DONE cannot be formed from the given letters.

Ans: (c)

Ans: (b)

Ans: (d)

Ans: (c)
In absence of an instrument to measure temperature, we can touch an object to know if it is hot or cold.

Ans: (a)

• Eating a low fiber diet is not considered healthy because fiber is essential for good digestion and overall health.
• On the other hand, chewing food properly, washing hands before and after meals, and avoiding water immediately after meals are all positive habits.
• Fiber helps in maintaining a healthy digestive system, so a low fiber diet can lead to issues.
• In summary, a low fiber diet is detrimental, making option (a) the correct answer.

Ans: (c)
This is also known as clinical temperature of human body

Ans: (c)

• Fibrous roots are a type of root system that consists of many thin roots that spread out from the base of the plant.
• Among the options, rice is a plant that typically develops a fibrous root system, which helps it absorb water and nutrients efficiently.
• In contrast, plants like turnip and rose have different root structures, such as taproots.
• Thus, the correct answer is rice, as it is well-known for its fibrous roots.

Ans: (a)

• Cows are herbivores, primarily consuming grass and plants.
• Honey bees feed on nectar and pollen from flowers.
• Butterflies also drink nectar from flowers.
• Mosquitoes feed on blood, which is different from the others.

Therefore, the cow is the odd one out because it has a different diet compared to the others, which primarily consume liquids from plants or animals.

Ans: (d)

• In a food chain, each organism is dependent on the one before it for food. In this case, the grass is eaten by the grasshopper, which is then eaten by the frog.
• If the population of grass increases, it provides more food for grasshoppers. This can lead to an increase in the grasshopper population.
• However, if the grasshopper population increases, it can lead to more food for frogs. Thus, the frog population is likely to increase as well.
• Therefore, the correct answer is that the population of frogs will increase.

Ans: (b)

• Unscrambling the letters "OOEGS" gives us the bird "GOOSE".
• Among the options, (b) is correct because geese have a unique beak structure with holes on the sides.
• Option (a) describes birds like eagles, which do not apply to geese.
• Option (c) refers to birds of prey, while option (d) is more general and not specific to geese.

Ans: (d)
Bell produces vibrations by hitting solid surface in a rhythmic manner.

Ans: (d)

• Option (d) is incorrect because putting wire netting on windows is actually beneficial. It allows fresh air to enter while preventing insects from coming inside.
• Sunlight is important as it helps in keeping the house free from germs, which is stated in option (a).
• Regular dusting, as mentioned in option (b), is essential for maintaining cleanliness.
• Covering drains, as per option (c), is a good practice to keep pests like cockroaches away.

Ans: (c)
Heat or absence of heat makes a body hot or cold.

Ans: (c)
The force of attraction between molecules breaks on heating and it converts into gas.

Ans: (b)

• Slow down is the correct action because the sign likely indicates a need for caution, such as a curve or a change in road conditions.
• Driving slower helps ensure safety and allows Radhika to react appropriately to any potential hazards ahead.
• Being cautious is important, especially in areas where road conditions may change suddenly.
• Options like stopping for a train or making a U-turn are not relevant unless specifically indicated by the sign.

Ans: (a)
Guitar has many strings which are vibrated to produce music.

Ans: (c)
Air is blown from mouth into the shehnai and by pressing of buttons, the air is compressed and expanded to produce music

Ans: (a)
Almost all the metals are good conductors of heat.

Ans: (a)
The antiseptic kills the germs and micro-organisms that may have stuck to the bulb of the thermometer, when it is put in the mouth by the patient.

Ans: (b)

• Diamond is recognized as the hardest mineral, making it a top choice for cutting tools and jewelry.
• Talc, on the other hand, is known as the softest mineral, often used in products like talcum powder.
• The other options include minerals that do not represent the extremes of hardness and softness.
• Thus, the correct pairing is X-Diamond and Y-Talc.

Ans: (c)

• Liter is indeed the correct unit for measuring capacity, such as liquids.
• Options (a) and (b) contain incorrect information about units of measurement.
• Stride and cubit are not standard units, and meter measures length, not weight.
• Option (d) incorrectly states that smaller lengths are measured in grams, which is a unit of mass.

Ans: (c)

• Shrubs are typically defined as woody plants that are smaller than trees and have multiple stems. In this case, the correct answer includes Hibiscus, Rose, Tulsi, and Jasmine, all of which are recognized as shrubs.
• On the other hand, Banana and Cucumber are not classified as shrubs; they are considered herbaceous plants.
• Understanding the characteristics of these plants helps in identifying which ones fit the shrub category.
• Thus, the correct grouping of shrubs from the options is (c) Hibiscus, Rose, Tulsi, Jasmine.

Ans: (c)

• Force is a push or pull that can cause an object to move or change its motion.
• It can make a stationary object start moving, and it can also change the speed of an object that is already moving.
• However, the statement that it cannot change the form of an object is incorrect, as force can indeed change the shape of objects, like when you squeeze a rubber ball.
• Additionally, force can change the direction of a moving object, such as when you steer a car.

Ans: (c)

• Sun is the nearest star to Earth, located about 93 million miles away.
• While Alpha Centauri and Proxima Centauri are also nearby stars, they are much farther than the Sun.
• The Sun provides light and heat essential for life on Earth, making it crucial for our existence.
• In comparison, Sirius is another star but is significantly farther away than the Sun.

Ans: (b)

• Sheep are typically kept in a pen, which is option 4.
• Pigs live in a sty, which is option 1.
• Horses are housed in a stable, which is option 3.
• Rabbits usually make their homes in a burrow, which is option 2.
• Thus, the correct matching is (b) 4 1 3 2, corresponding to Pig - Sty, Sheep - Pen, Horse - Stable, Rabbit - Burrow.

Ans: (c)
Anders Celsius was a Swedish physicist who developed the scale in 1742.

Ans: (d)

• In the conversation, Sushma is calling Raj to come and see a visitor.
• This suggests that she is in a common area where guests would be, which is typically the living room.
• The kitchen and bathroom are less likely places for her to be when expecting a guest.
• Therefore, the most logical answer is that Sushma is in the living room.

Ans: (a)

• Holi is a vibrant festival that marks the arrival of spring, celebrated with colors and joy.
• Christmas is celebrated in winter, while Diwali is a festival of lights celebrated in autumn.
• Independence Day is a national holiday, not a seasonal festival.
• Thus, Holi is the correct answer as it specifically aligns with the spring season.

Ans: (a)
In solids, molecules are closely packed. So, the sound vibrations get easily transferred from one molecule to another.

Ans: (d)
Solids expand to form liquids, liquids expand to form gases and gases expand and become less denser.

Ans: (b)
Using this formula, any temperature can be converted from Celsius scale to Fahrenheit scale. Both these scales show equal temperature at – 40. This means that, – 40°C = – 40°F

Ans: (a)
These words are of Greek origin.

Ans: (d)
The strings on harp are vibrated to produce music and sound waves.