2C Sci HBL 12 April 2022 Quiz

Which of the following statements is correct?

• The mass of a body is the same on the Earth as on the Moon.

• The weight of a body is the same on the Earth as on the Moon.

• The weight of a body on the Moon is zero.

• Both mass and weight can be measured in kilograms.

Which instrument measures the mass of a metal block?

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Which formula is used to calculate the density of an object?

Heat is conducted through a solid plastic rod by _______________.

• collisions of molecules in random motion

• collisions of vibrating molecules

• convection currents

• radiation

Gases are poor conductors of heat because ___________.

• their molecules are lighter

• they have fewer molecules

• their molecules move randomly

• their molecules are far apart

Boiling water and ice can exist at the same time in a test tube. What does this experiment show?

• Ice convects heat well.

• Metal gauze conducts heat badly.

• Water conducts heat well.

• Water conducts heat badly

Convection is a process of heat transfer that depends on

• Density differences in a liquid or a gas

• Heavy molecules falling and light ones rising

• Molecules vibrating and then keeping still

• Radiation of energy between two places

Convection occurs only in _____________.

• solids

• liquids

• solids and liquids

• liquids and gases

Given that all these surfaces are at the same temperature, which is the best radiator of heat?

• A shiny, white surface

• A dull, black surface

• A shiny, black surface

• A dull, white surface

Heat may be transferred through a vacuum by . . .

• convection, but not by conduction or radiation

• radiation, but not by conduction or convection

• convection and radiation, but not by conduction

• conduction and radiation, but not by convection