Science Olympiad Previous Year Questions - 1 | Science Olympiad Class 4 PDF Download

Ans: (b)

Ans: (a)

There are 2 curved lines in the word 'B'.

Ans: (b)

• The pattern starts at 75 and decreases by 5, then 6, then 7. The differences are 5, 6, 7.
• Following this pattern, the next difference should be 8. So, 57 - 8 = 49.
• The next number in the sequence is 49, which fits the pattern perfectly.
• Thus, the correct answer is (b) 49.

Ans: (d)
After interchanging the digits, we get 4 9 18 657 7th digits from the left end is 6 and 3rd to the left of 6 is 3.

Ans: (a)

• The code for HERO is $17, where H=8, E=5, R=18, O=15. The sum of the positions of H and E is 8+5=13, and R and O is 18+15=33. The code combines these values in a specific way.
• For POLO, the code is 2@3@, indicating a different pattern. The letters P, O, L, O correspond to their positions in the alphabet.
• To find HELP, we calculate H=8, E=5, L=12, P=16. The code for HELP will follow the same pattern as HERO, leading to the representation $132.
• Thus, the correct code for HELP in this language is $132.

Ans: (d)
All the given statements are correct. The plants that grow in nitrogen deficient soil eat and digest insects to fulfil their nitrogen requirement. The soil in marshy areas is full of water and there is no air trapped in soil, so, the roots grow above soil to breathe in air. The plants in desert areas have sunken stomata or leaves reduced to spines to prevent loss of water.

Ans: (c)

• The fabric that Rubina burnt produced a smell similar to burning celery. This is a key indicator of the type of material.
• Nylon is a synthetic fabric that, when burned, emits a smell reminiscent of burning celery, which is a distinct characteristic.
• In contrast, cotton and wool have different burning smells, while linen does not match this description either.
• Thus, the correct answer is Nylon, as it aligns with the observed burning smell.

Ans: (b)
These plants have tap root system.

Ans: (c)
The leaves of Venus flytrap help in trapping insects.

Ans: (b)

• Acacia is a type of tree that is well-adapted to dry environments like deserts.
• It has small leaves which help reduce water loss through a process called transpiration.
• This adaptation is crucial for survival in arid conditions where water is scarce.
• Other options like Sugarcane, Mango, and Water lily do not have the same adaptations for desert survival.

Ans: (c) 

The water absorbed by roots is transported through stem and the excess water is lost to atmosphere through stomata present on leaves.

Ans: (d)

• The see-saw is a type of lever, which is a simple machine used to lift or move loads.
• Pliers are also a type of lever, designed for gripping and bending objects.
• The claw hammer functions as a lever as well, primarily used for driving nails.
• However, the screwdriver is not a lever; it is a tool that turns screws, making it the odd one out.

Ans: (b)

• The part labelled as ‘X’ refers to the Air space in the figure of an egg.
• The Air space is located at the larger end of the egg and forms as the egg cools after being laid.
• This space is important for the developing embryo as it provides oxygen during incubation.
• Other options like Yolk, Albumen, and Embryo refer to different parts of the egg, but do not represent the air space.

Ans:  (d)
The seed grows into young plant and then to adult plant.

Ans: (b)
Life cycle is the circular process of how life continues and progresses from one generation to the next.

Ans: 

• R is indeed the hardest substance in our body, known as enamel.
• Q refers to dentin, which is a bone-like material that provides support to enamel.
• P is the pulp, which contains important nerves and blood vessels that nourish the tooth.
• Since all statements about parts P, Q, and R are correct, the answer is All of these.

Ans: (c)

• Option (c) is correct because it emphasizes safety by stating to cross the road only at the zebra crossing, which is a designated area for pedestrians. This helps prevent accidents.
• The other options include unsafe practices, such as leaving toys on the floor, which can cause tripping, or touching electrical appliances with wet hands, which is dangerous.
• Following the Do's and Don'ts is essential for maintaining safety and preventing injuries.
• Always remember to prioritize safety in daily activities.

Ans: (b)
Banana trees have soft and thick stems and bear fruit only once in their lifetime.

Ans: (c)

• The ball is on the roof, which means it is at a height. This height gives it potential energy.
• Potential energy is the energy stored in an object due to its position. In this case, the ball has energy because of its height above the ground.
• Kinetic energy would apply if the ball were moving, but since it is stationary on the roof, it does not have kinetic energy.
• Geothermal energy and chemical energy are not relevant to the situation of the ball on the roof.

Ans: (a)

• Jantar Mantar is an astronomical observatory located in Delhi.
• It was built by Sawai Jai Singh, who was a ruler and an astronomer.
• The observatory was designed to help in predicting the positions of celestial bodies.
• Other options like Aryabhata, Varahamihira, and Bhaskara were also great astronomers, but they did not build Jantar Mantar.

Ans: (d)

• Y is a solid layer is incorrect because Y typically refers to the outer core, which is actually a liquid layer.
• X is a liquid layer is correct, as it usually represents the outer core.
• Copper and magnesium are not the major elements in the outer core; instead, it mainly consists of iron and nickel.
• X is the thickest layer of Earth is also correct, as the mantle is the thickest layer.

Ans: (a)

• The banana plant develops from an underground stem, which is known as a rhizome. This structure allows the plant to grow and produce new shoots.
• Unlike typical plants that grow from seeds, the banana plant's growth is primarily from this underground stem, making it unique.
• The other options, such as root, leaf, and flower, do not serve as the primary growth point for the banana plant.
• Understanding this growth process is essential for recognizing how bananas propagate and thrive in their environment.

Ans: (c)

• Down feathers are crucial for providing insulation to birds, helping to maintain their body temperature.
• These feathers trap air close to the bird's body, which is essential for keeping the bird warm, especially in cold environments.
• Unlike other feathers, down feathers are soft and fluffy, making them excellent for thermal regulation.
• Thus, the correct answer is (c) because their main function is to keep the bird’s body warm.

Ans: (c)

• The food items that are rich in protein from the list are Egg, Fish, and Pulses.
• Sugar, Tomato, Corn, Cabbage, Ghee, Banana, and Sunflower oil do not provide significant protein content.
• Thus, there are a total of 3 items that are high in protein.
• Therefore, the correct answer is (c) 3.

Ans: (a)

• The correct answer is URSTJOLINA, which unscrambles to JOURNALIST.
• A journalist is a professional who gathers information and writes articles for newspapers and other media.
• Understanding the role of a journalist is important as they play a key part in informing the public about current events.
• The other options do not form a valid word related to news reporting.

Ans: (a)

• Magnetic compass is a tool used for navigation.
• The needle of the compass is a small magnet that aligns itself with the Earth's magnetic field.
• It always points towards the North direction, which is crucial for finding your way.
• This is why compasses are essential for hikers, sailors, and anyone needing to navigate.

Ans: (c)

• The oesophagus is primarily a part of the digestive system, not the excretory system.
• Lungs, kidneys, and skin all play roles in removing waste from the body.
• The lungs excrete carbon dioxide, the kidneys filter blood to remove waste, and the skin helps eliminate sweat.
• Thus, the correct answer is (c) Oesophagus, as it does not function in excretion.

Ans: (b)

• The question asks for the correct representation of X and Y based on a classification chart.
• Option (b) Cockroach / Mosquito is the correct answer, indicating the relationship between these two insects.
• Understanding the classification helps in identifying how these organisms are grouped based on their characteristics.
• Insects like cockroaches and mosquitoes belong to the same class but differ in their specific traits and behaviors.

Ans: (d)

• Soil formation is a gradual process that involves the breakdown of rocks.
• This breakdown is influenced by various natural elements such as wind, rain, and the heat of the sun.
• Each of these factors contributes to the weathering of rocks, leading to the creation of soil.
• Therefore, the correct answer is All of these as they all play a role in soil formation.

Ans: (c)

• The standard unit for measuring capacity is the litre.
• Grams measure weight, while kilometres measure distance.
• Celsius is a unit for measuring temperature, not capacity.
• Thus, the correct answer is litre, which is commonly used for liquids.

Ans: (a)

• The experiment involved three beakers placed in different locations: an open sunny area, a classroom, and a closed cupboard.
• The beaker in the open sunny area likely experienced the most evaporation due to sunlight and heat.
• The classroom would have moderate conditions, while the closed cupboard would have the least evaporation.
• Thus, the correct identification of the locations based on the results is: Open sunny area / Classroom / Closed cupboard.

Ans: (c)

• The force required to push an object depends on its weight and the surface it is on.
• Actions 1 and 2 involve pushing 2 kg objects on a flat surface, which requires the least force.
• Action 3 involves a 5 kg object on a flat surface, needing more force than actions 1 and 2.
• Action 4 requires the most force because it involves pushing a 5 kg sack up a slope, which adds to the effort needed.

Ans: (b)
The given plant is a water hyacinth. This plant can float freely on the surface of ponds and lakes.

Ans: (b)
P can be Hydrilla, Q can be Fir, R can be Lotus and S can be Gulmohar.

Ans: (a)
Leesa are needed to make food and flower helps in reproduction in plants.