GRADE 8 PRELIMINARY ROUND- SCIENCE QUIZ

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"As Delhi battles worsening air quality, residents are experiencing irritation in their eyes and respiratory tracts. Which gas in photochemical smog is responsible for these symptoms?"

• Carbon fibre
  

• Sulphur dioxide

• Ozone

• Carbon monoxide

German silver, valued for its resemblance to silver and used in jewellery and tableware, is composed of which metals?

• Nickel

• Copper

• Zinc

• All of the above

To regulate the temperature in many homes, a small device uses metal strips and thermal expansion to turn appliances on and off automatically. Which device is this?

• • Light switch

• • Thermostat

• • Smoke detector

• • Circuit breaker

When a person steps onto a weighing scale, it provides a reading based on the:

• • Gravity acting on the person

• • The volume of the person

• • Air pressure around the person

• • Magnetism produced by the person

In a winter landscape, you might see icebergs floating in the ocean, showing ice is less dense than liquid water. What conclusion can be drawn from this observation?

• • Solids are always denser than liquids.

• • Ice is more dense than water.

• • Not all solids sink in liquids.

• • Density affects buoyancy.

Recycling aluminium cans saves energy compared to producing new ones from raw materials. What is the primary benefit of recycling in this context?

• Reduces landfill waste

• Decreases mining needs

• Raises production costs

• Uses more energy

An architect designs buildings to withstand earthquakes by incorporating flexible materials. This approach illustrates an understanding of which concept?

• Gravity affects all structures equally.

• Only rigid structures can withstand natural disasters.

• Flexibility can reduce damage during seismic activity.

• All buildings must be made of concrete.