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HOTS SCIENCE COMPETITION 2020 UPPER PRIMARY

INSTRUCTION: Answer all 30 questions in this section. -------------------------------------------------------------------------------------------------------------------------- QUESTION 1-30 IS 4 MARKS EACH.

1. On cool wet days a person passes out more urine than on dry days. This is because _____________. A. The kidneys work better on wet days B. Only one kidney is working on wet days C. We lose less water by sweating on wet days D. The urinary bladder is always open on wet days E. More blood has turned into urine

2. Diagram 1 shows Jamal’s breakfast.

Diagram 1

Jamal’s breakfast was not a well-balanced diet because it did not include _________. A. Carbohydrates B. Fats C. Vitamins D. Water E. Proteins

3. When we were young, our milk teeth did not have ________.

A. Molars B. Canines C. Incisors D. Nerves E. Dentine/dentin

4. Which food is most easily destroyed by strong heat?

A. Oil B. Mineral salts C. Starch D. Vitamin C E. Proteins

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5. Which of the following shows the method of plant reproduction using tissue culture method? A. B.

C. D. E.

6. Diagram 2 shows a type of interaction in a saltwater ecosystem.

Diagram 2

A. Competition B. Commensalism C. Mutualism D. Saprophytism E. Epiphytism

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7. Table 1 shows the distance of six planets from the sun.

Planet Average distance from the Sun in millions of KM Mercury 58

Venus 108 Earth 150 Mars 228

Jupiter 778 Saturn 1427

Table 1 Which planet is 628,000,000 km from the Earth? A. Mercury B. Venus C. Mars D. Jupiter E. Saturn

8. Diagram 3 shows an experiment set up by a group of pupils.

Diagram 3

Which of the following describes the physical properties of the round object?

W X Y Z A. Opaque Translucent Transparent Opaque B. Opaque Opaque Translucent Transparent C. Transparent Opaque Translucent Opaque D. Translucent Transparent Opaque Opaque E. Opaque Transparent Translucent Opaque

Torch

Y Z

W X

Shadow of the round object

Screen

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9. Diagram 4 shows the conversations between Lokman and his brother.

Diagram 4

What can you infer based on the statement made by Lokman’s brother? A. The food has preservatives B. Sardine is not suitable for lunch C. The tin may be contaminated with bacteria D. The sauce on the tin has caused the tin to bulge E. Tin food is not suitable for young people

10. Which of the following animal is vertebrate (with backbones)?

Mana satu yang berikut adalah haiwan vertebrata (mempunyai tulang)?

A. B. C.

D. E.

Lokman

Let’s open this sardine as our lunch.

The tin is already bulged. It should never be eaten.

Snail Prawn

Sea urchin

Turtle

Beetle

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11. Diagram 5 shows a series of pictures.

Diagram 5 Which picture will complete the series? A. B. C.

D. E.

12. How long can a camel live in a desert without drinking water? A. not more than 2 weeks B. not more than 1 months C. can more than 3 months D. not more than 3 months E. not more than 4 months

13. Garden soil always contains the following except ____________.

A. Clay B. Sand C. Silt D. Lava E. Humus

?

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14. Which of the following uses the principle of second-class lever? A. B.

C. D. E.

15. Diagram 6 shows three situations.

Situation P

A rolling ball stops at a distance

Situation Q

A piece of paper in the air drops to the ground

Situation R

Magnets of different poles attract each other Diagram 6

Which of the following explains the types of force involved in the situations CORRECTLY?

Situation P Situation Q Situation R A. Gravitational force Frictional force Applied force B. Frictional force Gravitational force Magnetic force C. Applied force Gravitational force Magnetic force D. Gravitational force Frictional force Magnetic force E. Applied force Frictional force Magnetic force

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16. Diagram 7 shows the various positions on the track when a marble rolls down from position A to position D.

Diagram 7

Which answer given by pupils P, Q, R, S, and T is CORRECT? (Using T for true, F for false)

Descriptions Pupil P Q R S T

At position B the kinetic energy is the greatest. T F T T T

At position D, the kinetic energy is greater than at position B. T F F F F

At position A, the potential energy is greater than at position C. T T T F F

At position D, the kinetic energy is the lowest but the potential energy is the greatest.

F F F T T

At position A, the kinetic energy is the greatest but the potential energy is the lowest.

F F F F T

A. Pupil P B. Pupil Q C. Pupil R D. Pupil S E. Pupil T

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17. Diagram 8 shows the situation when a force and a load are balanced on a plank.

Diagram 8

Calculate force M needed to balance the plank. Use the following formula:

Force x Distance of force from the fulcrum = Load x Distance of load

from the fulcrum A. 10 N B. 40 N C. 60 N D. 100 N E. 800 N

18. pH (Potential of Hydrogen) value is used to determine __________ of water-based

solution.

A. The acidity B. The alkalinity C. The taste D. The acidity or alkalinity E. The sourness

19. Diagram 9 is a bar chart that shows the information obtained from a study on the relationship between the forest area and the number of Malayan Tigers in the forest.

Diagram 9

Force M

Plank

Load

Fulcrum 40N

20cm

80cm

Quantity

2007 2010 2013 2016 2019 Year

Legend

Forest area

Number of tigers

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What reason triggers the population trend of the tiger? A. Conservation of endangered species B. Excessive logging C. Reforestation D. Air pollution E. Preservation of endangered species

20. Diagram 10 shows an object observed by a student.

Diagram 10

Which of the following indicates the CORRECT observation and inference based on the diagram above? A. Observation : the leaf has parallel veins

Inference : the plant is lack of water

B. Observation : the leaf is green in colour Inference : the plant makes its own food

C. Observation : the leaf grows from the stem Inference : the stem supplies water to the leaf

D. Observation : part of the leaf is missing Inference : caterpillar has eaten part of the leaf

E. Observation : the leaf was eaten by chewing insects Inference : leaf is the main source of food for insects

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21. Many diseases may be cured by using antibiotics. However, the success of some antibiotics against puerperal fever has diminished in recent years. What is the reason for this situation?

A. Once produced, antibiotics gradually lose their activity. B. Bacteria become resistant to antibiotics. C. These antibiotics only help against puerperal fever, but not against other

diseases. D. The need for these antibiotics has been reduced because public health

conditions have improved considerably in recent years. F. Antibiotic are too expensive to produce.

22. Which food are not high in carbohydrates A. milk C. rice E. egg B. bread D. soybeans 23. Which material conducts heat the best? A. Air C. Stone E. Wood B. Water D. Steel 24. Why astronauts must wear spacesuits when they are exposed to the environment of

outer space?

i . Because no air for breathing ii. Because no air pressure in space iii. To prevent from excessive of ultraviolet iv. Because it can provide water to drink during spacewalk

A. ii & iii C. i, ii & iv E. None of the above B. i, ii & iii D. i, ii, iii & iv

25. Which material conduct is not good for electric?

A. Copper C. Diamond E. Aluminium B. Gold D. Lemon juice

26. Burning of hydrocarbons and vehicle exhaust smoke are the sources of gas P. Gas P is an

air pollutant. Gas P will form carboxyhemoglobin. What is gas P?

A. Nitrogen oxide C. Carbon dioxide E. Carbon monoxide B. Sulphur dioxide D. Hydrogen sulphide

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27. Which of the following are excretory organs?

i. Anus iii Lungs ii. Kidney iv Skin

A. i, ii, iii C. i, iii, iv E. i, iii, iv B. i, ii, iv D. ii, iii, iv

28. Based on the Table 2 below, arrange the correct steps in the process of fertilisation in

plant. The pollen tube starts to grow P Pollen grains fall onto the stigma. Q The male gamete enters the ovule and fuses with the female gamete R The pollen tube grows towards the ovule through the style. S The male gametes move down through the pollen tube towards the ovary. T A zygote is formed. U

A. Q, P, S, T, R, U

C. P, Q, S, T, R, U E. P, S, Q, T, U, R

B. Q, S, P, R, T, U D. P, S, Q, T, R, U

29. Hasnah would like to create layered drinks that consist of ices, tea, milk and palm sugar. Arrange the above substances according to their decreasing densities.

A. Ice, milk, tea, palm sugar B. Ice, tea, milk, palm sugar C. Palm sugar, milk, tea, ice D. Palm sugar, tea, milk, ice E. Milk, palm sugar, tea, ice

30. When a man suffers a heart attack it indicates that his blood vessels have become narrower. What is main cause for this?

A. Lack of iodine B. Diet has an excess of roughage and water C. Lacking proper amount of vitamins and minerals D. Diet has an excess of fats and carbohydrates E. Lack of proper amount of proteins and carbohydrates

END OF QUESTION PAPER

Table 2

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MSC 2020 – UPPER PRIMARY

ANSWERS 1. C 7. D 13. D 19. B 25. C 2. E 8. E 14. A 20. D 26. E 3. A 9. C 15. B 21. B 27. D 4. D 10. D 16. C 22. E 28. A 5. A 11. C 17. A 23. D 29. C 6. C 12. C 18. D 24. D 30. D