2nd 9 Week Benchmark Review

Which item is NOT a good conductor of electricity?

• 
  a tin can
• a rubber tire
• a copper coin
• an aluminum wire

Emily made a cup of tea and stirred it with a spoon. The spoon became warm. How was the heat from the tea transferred to the spoon?

• convection
• radiation
• conduction
• evaporation

Which of the following statements about thermal (heat) energy is true?

• As you hold a cup of hot water your hands cool the water.
• As you hold a glass of cold milk, the cold travels to your hand.
• As you hold a cup of cold milk, your hand cools the milk.
• 
  As you hold a cup of hot water, the heat moves to your hand.

Which substance can be used to conduct (move) electricity in a circuit?

• metal
• wood
• rubber
• plastic

What process forms an image in a mirror?

• 
  absorbing light
• 
  reflecting light
• refracting light
• 
  transmitting light

Why does a leaf look green in the summer?

• 
  The leaf absorbs green light.
• 
  The leaf produces green light in its cells.
• The leaf uses green light to make food in its cells.
• The leaf reflects green light and absorbs other colors of sunlight.

One end of a metal rod is placed over a flame during an investigation. A thermometer is touching the opposite end of the metal rod. Which best describes what is happening during this investigation?

• 
  Convection carries heat to the thermometer.
• 
  Radiant energy warms the thermometer.
• Mechanical energy from the flame carries heat to the thermometer.
• 
  Heat from the flame is conducted through the metal rod to the thermometer.

When a frying pan is placed on an electric stove top, heat energy is transferred from the burner to the pan by

• convection.
• 
  radiation.
• 
  conduction.
• 
  insulation.

How is energy transferred when an instant cold pack is put on a muscle injury?

• Heat energy is transferred by conduction from the muscle to the cold pack.
• Heat energy is transferred by convection from the cold pack to the muscle.
• 
  Heat energy is transferred by radiation from the muscle to the cold pack.
• 
  Heat energy is transferred by absorption from cold pack to the muscle.

What is the effect of absorption of infrared light by human skin?

• 
  sunburn on the skin surface
• 
  disinfection of the skin tissues
• 
  feeling of warmth on the skin
• 
  immediate death of skin cells