Science Olympiad Previous Year Paper - 2 | Science Olympiad Class 9 PDF Download

Ans: (c)
The plane is used as air transport but bicycle means plane. So, the correct answer is a bicycle.

Ans: (a)

• First, we swap the first and third digits of each number: 725 becomes 527, 396 becomes 693, 815 becomes 518, 437 becomes 734, and 526 becomes 625.
• Next, we arrange these new numbers in ascending order: 518, 527, 625, 693, 734.
• The second highest number in this order is 693.
• Now, we find the sum of the digits of 693: 6 + 9 + 3 = 18.

Ans: (d)
Similar figure repeats in every third step and each time a figure reappears it gets vertically inverted.

Ans: (d)

• The sequence starts with "a" and has gaps that need to be filled with the correct letters.
• By analyzing the pattern, we can see that the missing letters should logically fit into the sequence.
• Option (d) "cddab" correctly fills the gaps, maintaining the order of the letters.
• Thus, the correct answer is option (d) as it completes the series accurately.

Ans: (b)
In all other figures, there are two small line segments towards the pin and three small line segments towards the arrow.

Ans: (d)
Figure 4, contains figure (X).

Ans: (b)
The symbols move in the sequence. Also, the arrow rotates 135o anti-clockwise; the trapezium gets vertically inverted and the pin-shaped symbol rotates 90o clockwise.

Ans: (a)
From I, we have: S = T - 20.
From II, we have: V = T + 30.
Thus, from both I and II, we have: V + S = (T + 30) + (T - 20) = (2T + 10).
So, to get the required amount, we need to know the amount that Tarun has.

Ans: (b)
Colour of human blood is red but blue means red. So, the correct answer is blue.

Ans: (b)

• First, we need to replace the symbols with their respective operations: @ = ×, # = –, $ = +, and * = ÷.
• For option (b): 18 * 3 @ 3 # 7 $ 12 becomes 18 ÷ 3 × 3 – 7 + 12.
• Calculating step-by-step: 18 ÷ 3 = 6, then 6 × 3 = 18, next 18 – 7 = 11, and finally 11 + 12 = 23.
• Thus, option (b) is correct as it equals 23.

Ans: (c)

• The formula for displacement during a specific second is derived from the equations of motion. For the 4th second, the displacement is given by the formula: s4 = u + (1/2) a (7), where u is the initial velocity (0 in this case) and a is the acceleration.
• For the 5th second, the displacement is calculated using: s5 = u + (1/2) a (9).
• To find the percentage increase, we use the formula: Percentage Increase = [(s5 - s4) / s4] * 100.
• After calculating, we find that the percentage increase in displacement from the 4th to the 5th second is 28.57%.

Ans: (d)
The supplied heat is utilized in breaking the interaction between constituent of ice, and so temperature remains constant.

Ans: (a)
The Five Kingdoms are arranged in the order of increasing cellular complexity and organisation levels. Kingdom Monera is the lowest as they include prokaryotes. Kingdom Protista follows Monera as they are single-celled eukaryotes. Protista is followed by Kingdom Fungi, Kingdom Plantae and finally Kingdom Animalia.

Ans: (a)
Tetra atomic molecules are those molecules that are formed by a combination of four atoms.

Ans: (b)
Both smooth and cardiac muscle functions cannot be controlled by any organisms, hence they are involuntary.

Ans: (b)
Kingdom Monera and Protista consist of unicellular prokaryotes and eukaryotes respectively.

Ans: (d)

• The question asks for the incorrect match among the options provided.
• The Golgi apparatus is indeed responsible for the formation of lysosomes, making option (a) correct.
• Lysosomes are involved in autophagy, which is the process of breaking down cellular components, so option (b) is also correct.
• Vacuoles play a role in osmoregulation, helping to maintain the balance of water in cells, confirming option (c) is correct.
• However, option (d) incorrectly states that chloroplasts are related to turgidity and rigidity; they are primarily involved in photosynthesis.

Ans: (a)

Ans: (b)
Pressure and temperature are two external conditions

Ans: (c)
The image shown in option C is an organism and the rest are various cells found in the human body. The 1st one is the RBCs, the second one is the sperm cells and the last one is the nerve cells. The correct option is C which shows diatoms

Ans: (a)

• Both statements are true: Mountaineers do experience nosebleeds at high altitudes due to lower oxygen levels and dryness.
• Atmospheric pressure decreases: As you climb higher, the air pressure drops, which can lead to various health issues.
• Explanation link: The decrease in atmospheric pressure is the reason why nosebleeds occur, making statement 2 a correct explanation for statement 1.
• Conclusion: Therefore, both statements are true, and statement 2 explains statement 1 accurately.

Ans: (c)
Even though smooth and striated muscles undergo contraction and relaxation, only cardiac muscles undergo rhythmic contraction and relaxation. This is what results in the heartbeat.

Ans: (b)

• Statement I is true; increasing temperature and decreasing pressure can indeed liquefy gases.
• Statement II is also correct; ice at 273 K is more effective in cooling than water at the same temperature because it absorbs more heat during melting.
• Statement III is incorrect; the dissolution of salt in water does not indicate that matter is continuous.
• Statement IV is true; both evaporation and fusion (melting) processes require heat absorption.

Thus, the correct statements are II and IV, making the answer (b).

Ans: (c)
ZnO = 65 + 16 = 81

Ans: (c)
Anabaena belongs to Monera and the rest falls under Protista.

Ans: (c)

• Statement 1 is accurate as it describes the process of destructive distillation of coal correctly.
• Statement 2 is incorrect because kerosene and diesel are primarily obtained from the distillation of crude oil, not from coal.
• Thus, while the first statement is true, the second statement is false.
• This leads us to conclude that the correct answer is option (c).

Ans: (d)

• To find the mass by mass percentage, we use the formula: (mass of solute / total mass of solution) x 100.
• For option (d), the total mass is 3 g (sugar) + 90 g (water) = 93 g.
• The mass percentage is (3 g / 93 g) x 100 ≈ 3.23%.
• Calculating the percentages for the other options shows they are higher than this value, making option (d) the one with the lowest mass by mass percentage.

Ans: (c)

• Statement I is incorrect because dried grass is actually combustible.
• Statement II is correct; carbon dioxide is effective for extinguishing oil and petrol fires.
• Statement III is incorrect; biogas has a lower calorific value compared to petrol.
• Statement IV is correct; matchbox surfaces do contain powdered glass and red phosphorus.
• Thus, the correct options are II and IV, making (c) the right answer.

Ans: (d)

• Substance P is known as Wood charcoal, which is produced through the process of destructive distillation of wood.
• Substance Q is identified as Sugar charcoal, the purest form of amorphous carbon, created by dehydrating sugar using concentrated sulfuric acid.
• Both substances are important in various applications, with P being used in gunpowder and Q being a form of carbon used in different industrial processes.
• Thus, the correct pairing of P and Q is Wood charcoal and Sugar charcoal.

Ans: (c)
Kingdom Animalia lacks a cell wall while Fungi and Monera consist of single cellular organisms. Kingdom fungi on the other hand consist of multicellular eukaryotic organisms with a cell wall.

Ans: (d)
Adipose tissue is seen between internal organs and below the skin. The fat inside the adipose tissue act as a layer of insulation that traps heat.

Ans: (d)

• At –100°C, the temperature is well below the melting point of –33°C, so X would be in a solid state.
• At 0°C, which is above the melting point but below the boiling point, X would be in a liquid state.
• At 90°C, the temperature is above the boiling point of 66°C, meaning X would be in a gaseous state.
• Since all the statements are true, the correct answer is All of these.

Ans: (d)

• When you add a concentrated salt or sugar solution to the Rhoeo leaf, it causes water to move out of the cells.
• This process is called osmosis, where water moves from an area of low concentration to high concentration.
• As a result, the cell contents shrink away from the cell wall, creating a clear space.
• Thus, all the observations mentioned in the options are correct, making the answer (d) All of these.

Ans: (a)
The area under the velocity-time graph gives the displacement of the object.

Ans: (c)

• In the first statement, Ciliated epithelium is found in the oviducts, aiding in the movement of the egg.
• Smooth muscles are responsible for peristalsis, which is the wave-like movement in the alimentary canal.
• Areolar tissue connects the skin to muscles and supports the peritoneum.
• The last statement about blood entering through Haversian canals is not directly relevant to the correct answers.

Ans: (b)

• The diseases listed include Aspergillosis, Bird flu, Ranikhet, Tuberculosis, Cholera, Rinderpest, and Anthrax.
• Among these, Bird flu and Ranikhet are the only diseases caused by viruses in fowls.
• Thus, the total number of viral diseases affecting fowls from the list is 2.
• Other diseases like Tuberculosis, Cholera, Rinderpest, and Anthrax are caused by bacteria or fungi.

Ans: (a)
Vacuoles are the cell organelle that differs in size and number in animal and plant cells. In animal cells, they are small and numerous and in plant cells, they are few but very large. In plants cells, often the nucleus gets displaced because of the size of the vacuole.

Ans: (a)
Average atomic mass = (79 x 51.3 + 81 x 48.7)/100 = 79.97

Ans: (d)

• Rhizobium is a type of bacteria that plays a crucial role in nitrogen fixation, converting atmospheric nitrogen into a form that plants can use.
• In the analogy, we need to find a counterpart for nitrification, which is the process of converting ammonia into nitrates.
• Nitrosomonas and Nitrobacter are both involved in this process: Nitrosomonas converts ammonia to nitrites, and Nitrobacter converts nitrites to nitrates.
• Thus, the correct answer is Both B and C, as both bacteria are essential for the nitrification process.

Ans: (b)
1 kg of steam at 100ºC contains more heat because water required latent heat to form steam.

Ans: (c)

• Penicillin is indeed obtained from a type of multicellular fungus, specifically the mold Penicillium.
• Yeast is commonly used in making vitamin B-complex tablets due to its rich nutrient content.
• The DPT vaccine does not protect against typhoid; it is for diphtheria, pertussis, and tetanus.
• Salmonella is not used in cheese production; it is a bacterium that can cause food poisoning.

Ans: (b)

• The National park is primarily focused on protecting natural habitats and wildlife, while the others are more specialized in conservation methods.
• A Zoological park focuses on animal conservation, a Botanical garden on plant species, and a Gene bank preserves genetic material.
• Thus, the National park stands out as it serves a broader purpose of habitat protection rather than specific species conservation.

Ans: (a)
0.66 gram molecule of carbon dioxide

Ans: (a)

• Calcitonin is the hormone that plays a key role in lowering blood calcium levels.
• It is produced by the thyroid gland and helps to regulate calcium in the body.
• When calcium levels are high, calcitonin is released to help decrease them by promoting calcium deposition in bones.
• Other hormones like thyroxine, adrenaline, and insulin do not primarily function to lower calcium levels.

Ans: (b)

• Meristematic tissues are undifferentiated cells that have the ability to divide, so statement (i) is incorrect.
• They are closely packed with little to no intercellular spaces, making statement (ii) correct.
• These tissues are typically not multinucleated; they usually have a single nucleus, which makes statement (iii) incorrect.
• Meristematic cells usually have few vacuoles or none at all, so statement (iv) is correct.

Ans: (b)

Ans: (a)
Polio, elephantiasis and syphilis cannot spread through the aerosols. But COVID-19 can and the person travelling in poorly ventilated, overcrowded buses will be exposed to the virus.

Ans: (a)
Heterocysts are specialised nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica. 

Ans: (a)
Canal rays are the positively charged radiation produced in the discharge tube that seem to emerge from the anode and move towards the cathode. When a perforated cathode is used, they produce scintillations behind the cathode. Goldstein called these positive rays Kanalstrahlen, "channel rays" or "canal rays", because they could be detected only when a perforated cathode was used.

Ans: (b)
Let the number of neutrons be x.
Number of electrons = x - 2
Number of protons = x - 1
x + x - 1 = 23
x = 12
Therefore, the number of neutrons = 12
The number of protons = x - 1 = 12 - 1 = 11
Number of electrons = 12 - 2 = 10
The species is