STEM Decathlon Challenge

Which of the following is a physical quantity?

Yang manakah antara berikut adalah kuantiti fizik?

• Shape of lens

  Bentuk kanta

• Weight

  Berat

• Type of liquid

  Jenis cecair

• Brightness of bulb

  Kecerahan mentol

Which quantity is a scalar quantity?

Kuantiti manakah yang merupakan kuantiti scalar?

• Potential different

  Beza keupayaan

• Velocity

  Halaju

• Momentum

  Momentum

• Force

  Daya

Diagram shows an investigation about the effects of force and the motion of objects. Trolleys of different masses are pushed by the same amount of force.

Rajah menunjukkan satu penyiasatan tentang kesan daya terhadap gerakan objek. Troli yang berlainan jisim ditolak oleh jumlah daya yang sama.

Which of the following variables are correct?

Antara pembolehubah berikut, yang manakah betul?

• 
• 
• 
• 

Diagram shows a girl rolling an umrella to remove the rain droplets. Rajah menunjukkan seorang gadis sedang memutarkan payung untuk menyingkirkan titisan air hujan.

What is the physics concept involved in the above situation?

Apakah konsep fizik yang terlibat dalam situasi di atas?

• Momentum/

  momentum

• Inertia/Inersia

• Deceleration/ Nyahpecutan

• Impulse/ Impuls

A force is applied to an object. Which of the following will not occur?

Daya dikenakan ke atas suatu jasad. Antara yang berikut, yang manakah tidak akan berlaku?

• The object speeds up

  Jasad semakin laju

• The shape ofthe object changed

  Bentuk jasad berubah

• The mass of the object decreases

  Jisim jasad berkurang

• The object changes its direction of motion

  Arah gerakan jasad berubah

Rajah berikut menunjukkan satah-satah badan manusia. Antara satah berlabel A, B, dan C yang manakah membahagikan tubuh kepada bahagian ventral dan dorsal?

Diagram shows human body planes. Which of the planes labelled A, B, or C divides the body into ventral and dorsal parts?

• A. Satah sagittal/ Sagittal plane

• B. Satah frontal/ Frontal plane

• C. Satah melintang/ Horizontal plane

Rajah menunjukkan perubahan aras tenaga semasa suatu tindak balas, dengan kehadiran dan ketiadaan enzim. Apakah tenaga pengaktifan bagi tindak balas yang ada enzim?

Diagram shows the change in energy levels during a reaction, with and without the presence of the enzyme. What is the activation energy of reaction with the enzyme?

• A

• B

• C

• D

Rajah menunjukkan satu simbol dalam mengurus bahan sisa biologi.

Diagram shows a symbol for managing biological waste.

Apakah maksud simbol makmal tersebut?

What is the meaning of the laboratory symbol?

• Biobahaya/ Biohazard

• Bahan beracun/ Poisonous substances

• Bahan meletup/ Explosive substances

• Bahan karsinogenik/ Carcinogenic substances

Rajah menunjukkan Tindakan molekul J ke atas enzim L.

Diagram shows the action of molecule J on enzyme L.

Apakah kesan kehadiran molekul J terhadap tindak balas enzim L dengan substrat K?

What is the effect of the presence of molecule J towards the reaction of enzyme L with substrate K?

• Kadar tindak balas enzim L menurun/ Rate of reaction of enzyme L decreases

• Kadar tindak balas enzim L meningkat/ Rate of reaction of enzyme L increases

• Enzim L membentuk kompleks enzim-substrat dengan molekul J

  Enzyme L forms enzyme-substrate complex with molecule J

• Substrat K diuraikan kepada produk/ Substrate K is broken down into products

Rajah menunjukkan satu eksperimen untuk mengkaji pergerakan bahan merentasi tiub Visking.

Diagram shows an experiment to study the movement of substances through Visking tubing.

Apakah pemerhatian yang dapat dibuat selepas 20 minit?

What observation can be made after 20 minutes?

• Jisim tiub Visking bertambah/ The mass of Visking tubing increases

• Jisim tiub Visking berkurang/ The mass of the Visking tubing decreases

• Air suling bertukar warna menjadi biru/ The distilled water turns to blue

• Larutan sukrosa bertukar warna menjadi biru/ The sucrose solution turns to blue