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PIMSO 2022–2023 - Science - Primary 6 - Final Round

Question 1

The following image shows which level of biological organization

Question illustration
  1. Cell
  2. Tissue
  3. Organism
  4. Population
  5. Community

Question 2

A male Palawan peacock-pheasant courts a female by exhibiting its bright blue feathers. What phenomenon drives this behavior among Palawan peacock-pheasants?

Question illustration
  1. Natural selection
  2. Kin selection
  3. Sexual selection
  4. Viability selection
  5. Competition

Question 3

A patient was suffering from a neurodegenerative disease and therefore initiated a magnetic resonance imaging (MRI) scan of the brain to determine the origin of the disease. What would be the symptom of the disease, according to the MRI scan?

Question illustration
  1. Lapses in long-term memory
  2. Inability to speak
  3. Growth retardation
  4. Lack of coordination
  5. Breathing difficulty

Question 4

The electrocardiogram shows the electrical impulses from the heart following depolarization of the sinoatrial node and conduction of the impulse through the Purkinje fibers. Which phase of the cardiac cycle does the QRST wave represent?

Question illustration
  1. Atrial systole
  2. Atrial diastole
  3. Ventricular systole
  4. Ventricular diastole
  5. Resting phase

Question 5

Which of the following hormones is necessary for water regulation?
  1. Statin
  2. Renin
  3. Ghrelin
  4. Melatonin
  5. Erythropoietin

Question 6

The following graph shows the magnitudes of viral load, innate immune responses, and adaptive immune responses through the progression of an infection. Which of the following colors represent the innate immune response?

Question illustration
  1. Green
  2. Violet
  3. Blue
  4. Yellow
  5. All colors

Question 7

The device below measures the temperature inside a chamber. What is the best way to report the temperature?

Question illustration
  1. 28 °C
  2. 36 °C
  3. 35.5 °C
  4. 36.0 °C
  5. 40 °C

Question 8

A piece of a cracker-snack has the following nutrition facts: At LEAST how many crackers should one eat in order to get 1 g of fiber?

Question illustration
  1. 1
  2. 2
  3. 3
  4. 4
  5. None of the above

Question 9

A chemist poured some water into a graduated cylinder: How should she record this volume in her lab notebook?

Question illustration
  1. 5 mL
  2. 5.0 mL
  3. 5.00 mL
  4. 5.4 mL
  5. 5.40 mL

Question 10

Which of the following is NOT a mixture?
  1. sparkling water
  2. tap water
  3. bulalo soup
  4. air around us
  5. none of the above

Question 11

After months of exposure in air, 2.1 g of iron completely rusted and was found to weigh 2.95 g. The iron reacted with how much oxygen in air?
  1. 5.05 g
  2. 0.85 g
  3. More than 1 g
  4. None of the above
  5. Insufficient data

Question 12

1.60 g of methane gas was found to contain 1.2 g carbon and 0.4 g hydrogen. How much hydrogen could you find in 250 g of methane gas?
  1. 1.2 g
  2. 1.60 g
  3. 250 g
  4. 62.5 g
  5. Data is insufficient

Question 13

You found the following seashell on a beach in Boracay: Using a standard ruler as shown above, what is best way to report the length of the shell according to the precision of the ruler?

Question illustration
  1. 14 mm
  2. 14.5 mm
  3. 14.0 mm
  4. 15 mm
  5. 15.0 mm

Question 14

A ship leaves Manila Bay at 6:00. Shown below is its velocity over time. When is the ship’s acceleration non-zero?

Question illustration
  1. 6:00 to 7:00
  2. 6:00 to 10:00
  3. 8:00 to 10:00
  4. 6:00 to 7:00 then at 8:00 to 10:00
  5. 6:00 to 7:00 then at 8:00 to 10:00 then at 11:00 to 12:00

Question 15

In one version of the popular Filipino legend, Bernardo Carpio is a very strong man. He is often depicted trapped between two moving mountains, with hands spread apart, to stop the mountains from crashing onto each other. This makes the mountains stop, otherwise wise a great earthquake would occur. Bernardo Carpio fights the mountains to make them stop but the mountains are also fighting him in order to crush him. This illustrates which law of motion?
  1. Newton’s Law of Gravitation
  2. Newton’s First Law of Motion
  3. Newton’s Second Law of Motion
  4. Newton’s Third Law of Motion
  5. None of the Above

Question 16

Mayon Volcano is one of the most active volcanoes in the country. Under it is an immense pressure, which, from time to time, released in the form of hot lava, loud explosions, and shooting projectiles. Inside the volcano, what kind of energy is STORED?

Question illustration
  1. Sound energy
  2. Light energy
  3. Mechanical energy
  4. Potential energy
  5. Kinetic energy

Question 17

Which of the following is NOT affected by a net force?

Original choices:
A. a car turning a round-about at constant velocity
B. a bullet train maintaining its maximum speed at 300 km/hr
C. a train starting from rest
D. a falling drop of water
E. none of the above

Editorial task: Explain the source ambiguity and justify a scientifically sound interpretation.

Question 18

Basketball is the most popular sport in the Philippines. What is the minimum speed at which a 1.8 m player should throw a basketball in order for it to reach the basketball ring, situated 3 m above the ground? Assume that the player throws at the level of their head. The standard weight of a basketball is 600 g. Use g = 9.8 m/s².
  1. 4.8 m/s
  2. 7.7 m/s
  3. 5.4 m/s
  4. 3.4 m/s
  5. None of the above

Question 19

What is the process by which a solid changes directly into a gas without passing through the liquid phase?
  1. Condensation
  2. Sublimation
  3. Evaporation
  4. Precipitation
  5. Transpiration

Question 20

Which of the following is the largest layer of the Earth by volume?
  1. Crust
  2. Mantle
  3. Core
  4. Lithosphere
  5. Hydrosphere