PIMSO 2023 - Science - Primary 2 - National Round

Question 1

Question 2

The tamaraw is an endemic water buffalo that is found only in Mindoro, Philippines. An identifying characteristic of tamaraw is the short V-shaped horns, serving which main purpose?



Source: https://commons.wikimedia.org/

A. Mate selection
B. Regulation of temperature
C. Storage of minerals
D. Camouflage
E. Mutual relationship with birds

Editorial review: discuss the scientific issue and whether the source choices support one answer.

Question 3

Cacti are succulent plants which are adapted to hot and dry environments. The following image shows which part of the cacti?



Source: https://commons.wikimedia.org/

1. Fruit
2. Flower
3. Leaf
4. Stem
5. Root

Question 4

1. Brain
2. Lungs
3. Liver
4. Muscles
5. Bones

Question 5

1. Mouth → Stomach → Esophagus → Small intestine → Large intestine → Anus
2. Mouth → Stomach → Esophagus → Large intestine → Small intestine → Anus
3. Mouth → Esophagus → Large intestine → Small intestine → Stomach → Anus
4. Mouth → Esophagus → Stomach → Large intestine → Small intestine → Anus
5. Mouth → Esophagus → Stomach → Small intestine → Large intestine → Anus

Question 6

1. Amoeba
2. Bacteria
3. Viruses
4. Yeast
5. Molds

Question 7

Balloons are usually made up of rubber because rubber is elastic. It can expand when air is blown to the balloon. What phase of matter is the rubber balloon?



AJ, Open Clip Art Library, CC0, https://commons.wikimedia.org/w/index.php?curid=6214800

1. solid
2. liquid
3. gas
4. plasma
5. none of the above

Question 8

Question 9

You have to be careful when you hold a piece of egg because it can easily break. This illustrates what property of egg shells?



Goldmund100, Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=3753252

1. egg shells are biodegradable
2. egg shells are yellow
3. egg shells are light
4. egg shells are brittle
5. egg shells are small

Question 10

Cold butter, which is in the solid phase, turns to liquid when you spread it on a hot piece of bread. This illustrates what kind of phase change?



jeffreyw, mmm...warm fresh bread w/butter, uploaded by Fæ, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=23097519

1. evaporation
2. boiling
3. freezing
4. condensation
5. melting

Question 11

What property does the following device measure?



Michael Allen Smith, Weighing Red Espresso, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=54002461

1. hotness or coldness of matter
2. space occupied by matter
3. amount of matter
4. color
5. texture

Question 12

1. weight
2. volume
3. density
4. temperature
5. amount

Question 13

What kind of energy is stored inside batteries?



en:User:Brianiac, en:Image:Batteries.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=209635

A. chemical energy
B. mechanical energy
C. potential energy
D. sound energy
E. heat

Editorial review: discuss the scientific issue and whether the source choices support one answer.

Question 14

A ship leaves Manila bay at 6:00. Shown below is the distance travelled by the ship over time. When is the ship NOT moving?

1. From 7:00 to 8:00
2. From 8:00 to 9:00
3. From 9:00 to 10:00
4. From 10:00 to 11:00
5. From 11:00 to 12:00

Question 15

Because of climate change, many cities are pushing for alternative modes of transportation. Instead of busses and cars which contribute to greenhouse gasses, many choose to go to work or school on bicycles. For this, urban areas should have bicycle lanes for the safety of bicycle users. A bicycle contains what kind of simple machine?





Judgefloro, Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=50376597; Ralff Nestor S. Nacor, Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=99765507

A. inclined plane
B. pulley
C. wheel and axel
D. lever
E. wedge

Editorial review: discuss the scientific issue and whether the source choices support one answer.

Question 16

The Banaue Rice Terraces is a famous Philippine landmark. Built over a thousand years ago, the terraces allowed to grow rice even on mountains. On which part of the rice terraces would you have the highest potential energy?



Editorial assumption: compare the same person at the marked positions, using one reference level.

Edwin Juen Jr., Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=72812167

1. A
2. B
3. C
4. D
5. E

Question 17

1. potential energy and light
2. kinetic energy and sound
3. potential energy and sound
4. kinetic energy and light
5. light and sound

Question 18

1. gravitational force of the earth
2. gravitational force of the sun
3. friction force on the ground
4. normal force
5. no force is necessary to keep myself on the ground

Question 19

1. Spring
2. Summer
3. Fall
4. Winter
5. None of the above

Question 20

1. East
2. West
3. North
4. South
5. None of the above