Science Olympiad Previous Year Questions - 2 | Science Olympiad for Class 3 PDF Download

Ans: (c)
In sunlight Rohit will wear cap but cap is called pencil.

Ans: (b)
Suman comes on 2, 4, 8, 10, 12, 14, 18, 22, 24, 26, 28, 30 of September i.e., 12 number of days.

Ans: (c)

So, Rohan is at 8th position from the right end.

Ans: (c)
The pattern is,

Ans: (d)
As, 2 × 6 = 12
3 × 4 =12
And, 6 × 2 =12
But, 5 × 4 =20

Ans: (a)

• Tea is made from the leaves of the tea plant, while the others are derived from different parts of their respective plants.
• Coffee comes from the beans of the coffee plant.
• Rice is the seed of the rice plant.
• Green gram is the seed of the green gram plant.

Ans: (d)
This process helps in saving potable water for future use.

Ans: (d)
Pollutants are the substances that cause pollution.

Ans: (a)

• Rib cage is a bony structure that surrounds and protects vital organs in the chest.
• It primarily protects the heart and lungs, which are located in the thoracic cavity.
• The brain, however, is encased in the skull, not the rib cage.
• Therefore, the correct answer is (a) Brain, as it is the only organ listed that is not shielded by the rib cage.

Ans: (d)

• The food pyramid is a visual guide that helps us understand how to eat a balanced diet.
• At the top of the pyramid, we find oil and salt, which should be consumed in small amounts.
• The other options like grains, meat, and fruits are important but should be eaten in larger quantities compared to oils and salts.
• This structure emphasizes that while fats and salts are necessary, they should not dominate our diet.

Ans: (b)
Using the same amount or more does not conserve water. It rather depletes potable water.

Ans: (d)

• Children can show their love and respect in various ways. One way is by wishing them good morning and good night, which shows thoughtfulness.
• Another important action is apologizing when they make a mistake, demonstrating accountability and respect.
• Additionally, talking politely and respectfully is crucial in maintaining a positive relationship with elders.
• Therefore, the correct answer is all of these, as they all contribute to showing love and respect.

Ans: (d)
Tap is not a source of water. It is just used to start or stop the flow of water in households. Just like an electric switch, which is used to switch on and off the light but is not a source of electricity.

Ans: (c)
Rains are seasonal in nature. The rest of the year, the source of water is underground water pulled out from wells.

Ans: (a)

• Newspapers are a traditional medium that allows for the dissemination of information in printed form.
• They can reach a large audience at once, making them effective for sharing news and information.
• While radio and television also provide information, they do not do so in printed form.
• Thus, the correct answer is newspaper, as it specifically refers to printed information.

Ans: (b)
The rest three are methods to change state of matter and not of purification.

Ans: (c)

• Island is defined as a piece of land surrounded by water on all sides, not just three. This makes option (c) incorrect.
• Option (a) is correct because valleys are typically fertile and suitable for agriculture.
• Option (b) accurately describes plateaus as elevated flatlands, often rocky.
• Option (d) correctly defines hills as naturally raised areas of land.

Ans: (d)
Chlorine tablets are used to disinfect water and make it fit for drinking.

Ans: (a)

• The stem of the sugarcane plant is known for storing sugar and is widely consumed.
• It is edible and is used to produce various products like sugar and juice.
• Other options like bamboo, cactus, and pine do not have stems that are primarily known for storing food in an edible form.
• Thus, sugarcane is the correct choice as it meets both criteria of being edible and a food storage stem.

Ans: (c)

• Understanding the relationship: A luminous object emits its own light, like a star. In contrast, a non-luminous object does not emit light on its own.
• Identifying the correct option: Among the options, a sweater does not produce light, making it a suitable match for non-luminous.
• Other options: A torch and a candle both emit light, while the sun is a luminous object.
• Conclusion: Therefore, the correct identification for non-luminous is a sweater.

Ans: (c)

• The question asks for a rock that is often used for making statues.
• When you unscramble AMRLEB, it forms the word MARBLE, which is a popular material for sculptures.
• The other options do not unscramble to any known rock used in statue making.
• Thus, the correct answer is (c) AMRLEB.

Ans: (b)
Harvesting of rain water and using it for non-potable purposes helps to save water.

Ans: (a)

• Puris and Samosa are both deep-fried foods, which means they are cooked in hot oil.
• In contrast, Momos are steamed, and Pizza is baked, making option (b) incorrect.
• Dhokla is steamed, while Pakoras are fried, so option (c) is also not correct.
• Roti is typically cooked on a hot surface (tawa), while Dal is boiled, which makes option (d) incorrect.

Ans: (a)

• The container's total volume is 2000 cm³.
• Sumit pumped in 500 cm³ of air.
• Since the container can hold up to 2000 cm³, the volume of air in it is simply the amount added, which is 500 cm³.
• However, the question asks for the total volume of the container, which remains 2000 cm³ regardless of the air added.

Ans: (c)

• Greengrocer is the correct answer because this is a person or shop that specializes in selling fresh fruits and vegetables.
• A plumber deals with pipes and water systems, while a barber cuts hair.
• A mason works with stone and brick, not produce.
• Thus, the only option that fits the description of selling fruits and vegetables is greengrocer.

Ans: (d)
Rains and rivers are the source of water for agriculture. Tube wells and taps are used to supply river water to the farms.

Ans: (d)

• Non-verbal communication refers to conveying messages without using words, such as through gestures or body language.
• The term Mudra specifically relates to hand gestures used in various forms of communication, especially in dance and yoga.
• Options (a), (b), and (c) do not correctly match the type of communication with the appropriate term.
• Thus, the correct answer is (d) Non-verbal, Mudra, as it accurately describes a method of communication.

Ans: (b)

• To solve this, we need to remove every alternate letter from the options, starting with the first letter.
• When we apply this to option (b) ZUSRQEVTUEERG, we get the letters URETER, which is the correct term.
• The ureter is the tube that carries urine from the kidneys to the urinary bladder.
• Other options do not yield a valid term related to the urinary system when processed in the same way.

Ans: (c)

• Orion is known as the hunter in mythology and is one of the most recognizable constellations in the night sky.
• This constellation features prominent stars like Betelgeuse and Rigel, which help in identifying it.
• Orion is often depicted as a figure with a belt of three stars, representing the hunter's waist.
• Other options like Ursa Major and Leo do not represent a hunter, making Orion the correct choice.

Ans: (c)

• This situation illustrates evaporation, which is the process where liquid water turns into water vapor due to heat.
• When Jaya left the stove on, the heat caused the water to heat up and eventually disappear as it turned into vapor.
• Unlike freezing or condensation, evaporation specifically refers to the transition from liquid to gas.
• Thus, the correct answer is evaporation as the pot became empty due to the water turning into vapor.

Ans: (a)
Watering plants in the moonlight prevents water from evaporating and maximum being used by the plant.

Ans: (a)
ORS helps in maintaining the water, sugar and salt levels of a person suffering from diarrhoea.

Ans: (c)
Only 3% of total water present is fresh water. Out of this 3%, only 2% (which is same as around 65% of the fresh water) is in the form of glaciers and the rest is available for consumption.

Ans: (a)
The water cycle starts with evaporation of water from water bodies.
This happens due to heat of sun. So, solar energy is the main source that starts the water cycle.

Ans: (c)
Water cycle is the natural process by which water starts its journey from water bodies, condenses to form clouds, precipitates as rain or snow and runs off back to the water bodies.