Sec 1 Science quiz

Which of the following statement describes an element?

• It usually has a low density

• It cannot be broken down into simpler substances

• It cannot combine with other elements to form new substances

• it will not undergo a change in state when heated

Copper is usually used in electrical wires. Why can silver be used to replace copper in electrical wires?

• It is a poor electrical conductor

• It is a poor heat conductor

• It is a good thermal conductor

• It is a good electrical conductor

Which of the following group of elements consists of only metal?

• aluminium, calcium, iron

• copper, silicon, zinc

• carbon, magnesium, tin

• mercury, sulfur, sodium

Why do people feel cold when they come out of the ocean and do not wipe themselves immediately?

• Water insulates them from the warm air

• Water is colder than the air

• Water evaporates and causes cooling

• Water is a good conductor of heat

At which temperature are water molecules most orderly arranged?

• -10C

• 5C

• 90C

• 105C

Which of the following reaction DO NOT produce carbon dioxide as one of its products

• burning of carbon

• heating copper carbonate

• thermal decomposition of sugar

• heat produced during shower

What does this symbol represent?

What is the correct formula for density?

• Density = Weight ÷ Mass

• Density = Mass ÷ Volume

• Density = Mass + Weight

• Density = Volume x Mass

What is the definition of Density?

• Density is the volume per unit weight

• Density is the size of the volume weight

• Density is the volume and weight combined

• Density is the mass per unit volume

The density of oil is 0.8g/cm³. What is the mass of 36cm³ of the oil?