Science KSSM Form 1 Chapter 7

What causes gases to trap in Earth?

• Atmosphere

• Sun

• Moon

• Space

Air is a mixture of many substances. Which of the following examples is not one of them?

• Microorganisms

• Dust

• Water vapour

• Hydrogen

• Magnesium

What is W?

• Oxygen

• Nitrogen

• Carbon dioxide

• Inert gases and other substances

What is X?

• Oxygen

• Nitrogen

• Carbon dioxide

• Inert gases and other substances

What is Y?

• Oxygen

• Nitrogen

• Carbon dioxide

• Inert gases and other substances

Z is inert gases and other substances. Which of the following are examples of inert gases?

• Argon

• Neon

• Helium

• Hydrogen

• Ferum

Which of the following is not an importance of oxygen?

• Respiration

• Combustion of fuels

• Welding and cutting

• Photosynthesis

Which of the following is an importance of carbon dioxide?

• Respiration

• Production of juice drinks

• Photosynthesis

• Cooling agent

Which of the following statements about inert gases is NOT true?

• Helium is used to fill hot air balloons and weather balloons.

• Neon gas is used in advertising lights.

• Argon is used in refrigerators.

Which of the following activities released carbon dioxide in carbon cycle?

• Respiration

• Decomposition

• Burning of fossil fuels

• Photosyntesis

• Use of electric cars