Science Heat Transfer

• Convection is the transfer of heat by the movement of a gas or a liquid.
• Conduction is the transfer of heat by means of physical contact between bodies or substances.
• Radiation is the transfer of heat by electromagnetic waves.
• Ice cream melting under the heat of the sun is an example of? :

  a . convection

  b . conduction

  c . radiation

  d . conduction, convection, and radiation

  C
• cooking in a pan heated on a stovetop is an example of? :

  a . convection

  b . conduction

  c . radiation

  d . conduction, convection, and radiation

  b
• heating air in a closed room using radiators is an example of? :

  a . convection

  b . conduction

  c . radiation

  d . conduction, convection, and radiation

  a
• rising of hot air balloons is an example of? :

  a . convection

  b . conduction

  c . radiation

  d . conduction, convection, and radiation

  a
• which of the subatomic particles is transferred when an atom becomes charged?

  a . atom

  b . electron

  c . neutron

  d . proton

  d
• what happens when the atom becomes positively charged?

  a . the protons are lost

  b . the protons are shared

  c . the electrons are lost

  d . the electrons are gained

  a
• which of the following correctly describes the law of of electrical charges?

  a . like charges repel

  b . like charges attract

  c . unlike charges repel

  d . electrical charges either attract or repel

  a
• which of the following situations accurately describes the heat transfer process?

  a . our human bodies radiate energy

  b . bodies that appear black are good absorbers of heat

  c . heat transfer occurs due to a change in thermal conductivity

  d . cold air goes up and hot air goes down in convection current

  b
• which of the following accurately describes how heat flows?

  a . from denser to less dense material

  b . from high temperature to low temperature bodies

  c . heat transfer occurs due to a change in thermal conductivity materials

  d . from low thermal conductivity too high thermal conductivity materials

  b
• what type of charging process is involved when a charged object is placed at a certain close distance from a neutral object inducing a net electric charge?

  a . conduction

  b . grounding

  c . induction

  d . insulating

  c