Revision Year 8

• Science
• Lower Secondary (Key Stage 3)

Revision Year 8

1. What process releases carbon dioxide into the atmosphere?

1. Decomposition of organic matter
2. Weathering of rocks
3. Photosynthesis
4. Combustion of fossil fuels

2. Which of the following is a natural sink for carbon dioxide?

1. Oceans
2. Atmosphere
3. Soil
4. Plants

3. What is the primary source of carbon for photosynthesis?

1. Carbon dioxide
2. Nitrogen dioxide
3. Oxygen
4. Methane

4. What human activity contributes to the increase of carbon dioxide in the atmosphere?

1. Burning of forests
2. Planting trees
3. Recycling plastics
4. Using public transportation

5. What process involves the conversion of organic carbon into inorganic carbon?

1. Burning of fossil fuels
2. Photosynthesis
3. Erosion
4. Decomposition

What is the primary cause of the greenhouse effect?

1. Volcanic eruptions
2. Solar radiation
3. Deforestation
4. Increased concentration of greenhouse gases in the atmosphere

Which gas is the most significant contributor to the greenhouse effect?

1. Carbon dioxide
2. Nitrogen
3. Methane
4. Oxygen

What effect does the greenhouse effect have on global temperature?

1. It only affects local temperatures
2. It leads to an increase in global temperatures
3. It has no impact on global temperatures
4. It causes a decrease in global temperatures

What are some natural sources of greenhouse gases?

1. Deforestation
2. Burning fossil fuels
3. Volcanic eruptions and decomposition of organic matter
4. Industrial processes

How does the greenhouse effect impact climate change?

1. It only affects weather patterns
2. It has no connection to climate change
3. It contributes to the warming of the Earth's climate
4. It leads to cooling of the Earth's climate

Which of the following is not a fossil fuel?

1. Natural gas
2. Petroleum
3. Solar energy
4. Coal

What is the primary component of fossil fuels?

1. Oxygen
2. Hydrocarbons
3. Nitrogen
4. Carbon dioxide

Which fossil fuel is commonly used for heating and electricity generation?

1. Gasoline
2. Propane
3. Methane
4. Coal

What is the environmental impact of burning fossil fuels?

1. Air pollution and greenhouse gas emissions
2. Water conservation
3. Soil enrichment
4. Biodiversity preservation

Which process is used to extract petroleum from underground reservoirs?

1. Evaporation
2. Drilling
3. Filtration
4. Distillation

What is conduction in an experiment?

1. The transfer of heat through direct contact.
2. The transfer of heat through convection.
3. The transfer of heat through radiation.
4. The transfer of heat through insulation.

Which material is a good conductor of heat?

1. Metal
2. Glass
3. Wood
4. Plastic

What is the unit of measurement for thermal conductivity?

1. Celsius
2. Grams
3. W/mK (Watts per meter Kelvin)
4. Joule

What happens to the rate of conduction with an increase in temperature difference?

1. The rate of conduction becomes zero.
2. The rate of conduction remains constant.
3. The rate of conduction increases.
4. The rate of conduction decreases.

Which type of material is an insulator?

1. Aluminum
2. Rubber
3. Copper
4. Silver

Which of the following is an example of conduction?

1. Heat rising from a campfire
2. Steam rising from a cup of coffee
3. Touching a metal spoon that was in hot soup.
4. Water boiling in a kettle

What is the process of conduction?

1. The transfer of heat through convection
2. The transfer of heat through sound waves
3. The transfer of heat through direct contact.
4. The transfer of heat through radiation

Which material is a good conductor of heat?

1. Plastic
2. Copper
3. Glass
4. Wood

What happens to the particles in a material during conduction?

1. They emit light energy
2. They move away from each other
3. They become stationary
4. They vibrate and pass heat energy to neighboring particles.

Which statement best describes conduction?

1. It occurs in solids, liquids, and gases.
2. It only occurs in liquids
3. It only occurs in solids
4. It only occurs in gases

What is convection?

1. The transfer of heat through electromagnetic waves
2. The transfer of heat through the movement of fluid
3. The transfer of heat through static air
4. The transfer of heat through direct contact

How does convection occur in the atmosphere?

1. By the reflection of sunlight
2. By the movement of air masses at different temperatures
3. By the rotation of the Earth
4. By the release of heat from the Earth's core

What is an example of natural convection?

1. The cooling of a hot cup of coffee
2. The heating of a metal spoon in hot soup
3. The circulation of hot water in a pot on a stove
4. The melting of ice in a warm room

How does convection help in cooking food?

1. By directly heating the food
2. By cooling the food to prevent burning
3. By transferring heat from the hot air to the food
4. By attracting flavors to the food

What is the role of convection in ocean currents?

1. It drives the movement of water across the oceans
2. It makes the water salty
3. It creates waves on the surface
4. It causes the water to evaporate

What is the primary mode of heat transfer for radiation heat?

1. Electromagnetic waves
2. Conduction
3. Chemical reactions
4. Convection

Which type of surfaces are good emitters of radiation heat?

1. Light and smooth surfaces
2. Dark and rough surfaces
3. Transparent surfaces
4. Metallic surfaces

What is the unit of measurement for the rate of heat transfer by radiation?

1. Grams per cubic meter
2. Degrees Celsius
3. Watts per square meter
4. Joules

What does the Stefan-Boltzmann law describe for radiation heat?

1. The specific heat capacity of materials
2. The rate of heat transfer in gases
3. The temperature difference in a system
4. The total energy radiated by a black body

Which of the following is an example of radiation heat transfer?

1. Touching a hot metal pan
2. Warm air rising from a heater
3. Boiling water in a pot
4. Feeling the warmth of the sun on your skin