Science Olympiad Model Test Paper - 1 | Science Olympiad Class 9 PDF Download

Ans: (c)

• The original expression is transformed to: 30 ÷ 5 × 4 + 7 – 9.
• Now, perform the operations in the correct order: first, 30 ÷ 5 equals 6.
• Next, multiply: 6 × 4 equals 24.
• Then, add: 24 + 7 equals 31, and finally subtract: 31 – 9 equals 22.

Ans: (a)

• From the given codes, we can analyze the phrases and their corresponding numbers.
• The word "always" appears in the phrase "sky always beautiful," which is coded as "365."
• By comparing the codes, we find that "always" is represented by the number 6.
• Thus, in this coding language, "always" is written as 6.

Ans: (b)

• To find the number of 4's that meet the criteria, we need to look for 4's that are preceded by 3 and not followed by 8.
• In the series, the relevant 4's are located at positions where they are directly after a 3 and not followed by an 8.
• Upon examining the series, we find 3 instances of 4 that satisfy these conditions.
• Thus, the answer is 3.

Ans: (a)
In each step, the pin rotates 90º clockwise and the arrow rotates 90o anti-clockwise.

Ans: (b)
Only in fig. (4), both the parallel lines are bent in the same direction (i.e. towards the left).

Ans: (a)
The figure is enclosed in a new figure with one more number of sides, in such a way that the upper vertex of the two figures coincides.

Ans: (a)
From I, we have: D > A, D > C.
From II, we have: E > B > D.
Combining the above two, we get: E > B > D > A > C or E > B > D > C > A.
Thus, E is the tallest.

Ans: (c)
King of Jungle Lion and Lion is called Tiger. So, the correct answer is Tiger.

Ans: (b)
Wife of Aashi’s husband - Aashi; Brother of daughter - Son.
So, the boy on the stage is Aashi’s son.

Ans: (a)

This sequence 2, 15, 4, 12, 6, 7, ?, ? is a combination of two series :
1st: 2, 4, 6, ? and 2nd: 15, 12, 7, ?
1st consists of consecutive even numbers.
So, missing term of 1st sequence = 8.
Pattern of 2nd sequence is -3, -5, ...
So, missing term of 2nd sequence = 7 - 7 = 0.

Ans: (c)

• Statement 1 is correct because at the center of the Earth, the gravitational forces from all directions cancel out, making the weight effectively zero.
• Statement 2 is incorrect because as you move from the center to the surface of the Earth, gravity initially increases until you reach the surface, and then it decreases as you go further away from the Earth.
• Thus, the correct option is that Statement 1 is true while Statement 2 is false.

Ans: (b)
The frequency (f) of the wave can be calculated as follows:
f = Number of vibrations / Time = 640 vibrations / 4 s = 160 Hz.
The wavelength (λ) can be found using the formula: λ = Velocity / Frequency.
Substituting the values:
λ = 240 m/s / 160 Hz = 1.5 m.

Ans: (c)

• To find the distance between the wall and the boy, we use the formula: distance = speed × time.
• The sound travels to the wall and back, so the time for the sound to reach the wall is half of the total time.
• Calculating: d = (340 m/s × 2.2 s) / 2 = 374 m.
• Thus, the distance from the boy to the wall is 374 meters.

Ans: (a)
The death of aquatic organisms is due to water pollution. The rest are various factors that help to understand the changes in water, dissolved oxygen levels and temperature based on which one differentiates polluted and non-polluted water.

Ans: (a)

• The brightness of the bulb is directly related to the current flowing through the circuit.
• Since the bulb in setup X is brighter, it indicates that a higher current is passing through it compared to setup Y.
• This means that the current in setup X is greater than in setup Y.
• Thus, we can conclude that option (a) is correct.

Ans: (a)
The listed observations are characters of sclerenchyma cells.

Ans: (a)

• Newton's Third Law states that for every action, there is an equal and opposite reaction.
• This means that the gravitational force F1 acting on the Sun due to the Earth is equal to the gravitational force F2 acting on the Earth due to the Sun.
• Thus, we conclude that F1 = F2.
• Both forces are present and equal, so the option stating they are both zero is incorrect.

Ans: (a)

• Loudness refers to how strong or intense a sound is, which is determined by its amplitude. A louder sound has a greater amplitude.
• Pitch is how high or low a sound is, and it is inversely related to frequency. A lower pitch means a lower frequency.
• In this case, since the second note is louder and has a lower pitch, it indicates that it has a higher amplitude and a lower frequency.
• Thus, the correct description of the second note is that it has a higher amplitude and a lower frequency, which corresponds to option (a).

Ans: (c)
The distance traveled by the sound wave is equal to twice the depth of the ocean.
Distance = Velocity × Time = 1400 m/s × 10 s = 14000 m.
Depth = Distance / 2 = 14000 m / 2 = 7000 m = 7 km.

Ans: (c)
Climate, optimum temperature, irrigation, fertilisers and photoperiods are necessary for the optimum growth and yield of crops. Photoperiods is the time during a day in which the plants receive sunlight.

Ans: (a)

• Gravitational force depends only on the masses and the distance between them, not on the medium they are in.
• When the two masses are in water, the distance remains the same, so the force remains unchanged.
• Thus, the gravitational force in water (q) is equal to the gravitational force in air (p).
• Therefore, we conclude that p = q.

Ans: (b)

• Speed of sound can be calculated using the formula: v = 2d/t.
• Here, d is the distance to the object, which is 3630 m, and t is the time taken for the echo to return, which is 5 s.
• Substituting the values: v = 2 × 3630 m / 5 s = 1452 m/s.
• Thus, the speed of sound in water is 1452 m/s.

Ans: (b)

• Sulphur dioxide is actually classified as an acidic oxide, which means it reacts with bases to form salts and water.
• The other options are correct: Calcium oxide is a basic oxide, Sulphur is indeed a poor conductor of heat and electricity, and Silver is recognized as a noble metal.
• Understanding these classifications helps in chemistry, especially in reactions and properties of different substances.

Ans: (c)

• Colloids 
• Suspensions 
• Thus, the correct classification is: Colloids – (i), (ii), (iv), (vi) and Suspensions – (iii), (v).
• Option (c) accurately reflects this classification.

Ans: (c)
The fluid that is seen inside the plasma membrane is called cytoplasm. All cell organelles are embedded in the cytoplasm. The fluid seen inside the nuclear membrane is called nucleoplasm and it contains, DNA, nucleoplasm and various transcription factors etc.

Ans: (b)

• X has a valency of 3, which means it can combine with three chloride ions to form XCl₃.
• To find the formula for its nitride, we consider that nitrogen typically has a valency of 3 as well.
• Thus, X will combine with one nitrogen atom, leading to the formula XN.
• This shows that the correct formula for the nitride of element X is XN.

Ans: (d)
Crop variety improvement, production improvement and protection management are cornerstones in increasing the availability of food materials across the country. It also helps to combat food prices and inflation.

Ans: (c)

• The correct decreasing order of calorific values is Hydrogen > LPG > Methane > Petrol.
• This means that Hydrogen provides the most energy when burned, followed by LPG, then Methane, and finally Petrol.
• Understanding this order is important for choosing fuels based on their energy efficiency.
• In summary, Hydrogen is the best fuel in terms of energy output, making it a preferred choice for high-energy needs.

Ans: (a)
Land breeze: air travels from land to water for which air over water to be warmer than the air over land.
Sea breeze: air travels from sea to land for which air over land needs to be warmer.

Ans: (a)
First, calculate the power delivered by each individual using the formula: Power = Work / Time
For Peter:
Work = 300 J
Time = 10 s
Power_Peter = 300 J / 10 s = 30 W
For James:
Work = 150 J
Time = 4 s
Power_James = 150 J / 4 s = 37.5 W
Now, find the ratio of the power delivered by Peter to that of James: Ratio = Power_Peter : Power_James = 30 W : 37.5 W = 30/37.5 = 4/5
Therefore, the answer is (a) 4:5.

Ans: (c)
Both mental and social well-being are hard to achieve as it is difficult to measure both. Physical health can be measured easily.

Ans: (a)
The distance traveled by the sound is equal to twice the distance to the building.
Distance = Speed × Time = 346 m/s × 1 s = 346 m.
Distance to the building = 346 m / 2 = 173 m.

Ans: (a)

• Artificial insemination is a technique used to breed cattle.
• It is important to note that it is only effective during the female animal's fertility period, known as oestrous.
• Using this method can lead to a high rate of successful fertilization and is economical since a single bull's semen can impregnate many cows.
• Additionally, it allows for the breeding of animals with specific desired traits.

Ans: (d)
Prokaryotes lack a well-defined nucleus. The nucleus lacks a nuclear membrane and nucleolus. Prokaryotic organisms also lack membrane-bound cell organelles and have only one chromosome that contains all the genetic information. The cell is small and the organisms are unicellular.

Ans: (c)
The causative organism of common-cold is a virus and not a bacterium.

Ans: (b)

• The cell wall is a non-living structure that provides support and protection to the plant cell.
• In contrast, ribosomes, lysosomes, and chloroplasts are all considered living parts because they are involved in various cellular functions.
• Ribosomes are essential for protein synthesis, lysosomes help in digestion, and chloroplasts are involved in photosynthesis.
• Thus, the correct answer is (b) Cell wall, as it does not carry out any metabolic activities.

Ans: (c)
Time Taken to Perform Work
The formula for power is: Power = Work / Time
Rearranging the formula to find time: Time = Work / Power
Given:
Work = 560 J
Power = 14 W
Time = 560 J / 14 W = 40 s
Therefore, the answer is (c) 40 s.

Ans: (c)
CFCs and smog are pollutants that degrade the air quality. CFCs destroys the ozone layer. Smog is a mix of smoke and fog. Smog can be poisonous or allergic to many and reduces visibility.

Ans: (c)

• Chicken pox is actually caused by a virus, specifically the varicella-zoster virus, not by bacteria.
• Polio is caused by a virus, and Athlete’s foot is caused by a fungus.
• Tetanus is caused by a type of bacteria known as Clostridium tetani.
• Thus, the pairing of Chicken pox with Bacteria is incorrect.

Ans: (d)

• MCPA is actually a herbicide, which means it is used to control weeds, not a rodenticide that targets rats.
• The other statements are true: broadcasting is a common method for sowing seeds, Rahat is indeed a lever-based irrigation system, and silos are designed for storing grains.
• Understanding the correct use of these terms is important in agriculture and pest management.

Ans: (b)
Proteins are the most diverse macromolecules found in the human body. Each cell consists of several thousand different proteins with varying functions.

Ans: (d)
When a body is thrown upwards, the force of gravity is in the downward direction.
The acceleration due to gravity is 9.8 m/s² near the surface of the earth.

Ans: (a)
Composting is the process of conversion of biological waste (animal excreta, food waste and plant parts) into nutrient-rich fertilisers. If the process employs red worms, it is called vermicompost.

Ans: (a)

• The act of a hen sitting on her eggs to keep them warm is known as brooding.
• This process is essential for the development of the embryo into a chick.
• Brooding provides the necessary heat and protection for the eggs.
• Other options like parturition and broadcasting do not relate to the incubation of eggs.

Ans: (d)
Statement 1: As a body rolls down an inclined plane, it has only kinetic energy.
This statement is incorrect because a rolling body has both kinetic energy and potential energy (if it's rolling down an incline).

Statement 2: The kinetic energy of a body depends on its mass only.
This statement is also incorrect because kinetic energy depends on both mass and velocity (K.E. = 1/2 mv²).
Thus, the correct option is (d) Both the statements are incorrect

Ans: (b)

• Both girls do the same amount of work because they are climbing the same height of 12 m.
• The energy transfer occurs from chemical energy (from their bodies) to potential energy (as they gain height).
• When Divya falls, her kinetic energy increases as she descends, but the question focuses on the energy transfer during the climb.
• Thus, the correct answer is that both do the same work, and the energy transfer is from chemical to potential energy.

Ans: (c)
The area under the velocity-time graph gives the displacement of the object. As the particle moves in the same direction, this is also the distance covered.

Ans: (a)
The efficiency of a fuel is generally measured by its calorific value, which represents the amount of energy produced per unit mass when the fuel is completely burned. According to the table:
LPG has the highest calorific value of 55000 kJ/kg, making it the most efficient fuel.
CNG comes next with a calorific value of 50000 kJ/kg.
Diesel has a calorific value of 45000 kJ/kg.
Coal has the lowest calorific value, ranging between 25000 and 33000 kJ/kg.
Hence, the order of efficiency is: LPG > CNG > Diesel > Coal.

Ans: (a)
Alloys are homogeneous mixtures of two or more metals or metals and non metals. Hence, these are classified as true solutions.
Alloying helps to enhance the properties of the component metals and increases their field of applications.

Ans: (b)
120 - 10 x g = 10 a
120 - 10 x 9.8 = 10 a
120 - 98 = 10 a
a = 2.2 m/s²