CBA 2 Review Question Preview (ID: 44876)


Review Of Forces And Energy. TEACHERS: click here for quick copy question ID numbers.

All of the following are conductors of electricity EXCEPT-
a) aluminum nail
b) rubber band
c) copper penny
d) steel fork

Electricity will flow in an electric circuit only if the circuit-
a) has several batteries
b) makes a complete path
c) produces light energy
d) has the right kind of insulators

What object could be placed between the wires of a circuit to complete the circuit?
a) penny
b) eraser
c) toothpick
d) crayon

Conductors allow thermal and electrical energy to pass through easily. Insulators prevent the flow of thermal and electrical energy. Which of the following items is a poor conductor and a good insulator?
a) silver
b) wood
c) stone
d) copper

Which of these would be a good insulator of electricity?
a) steel
b) rubber
c) copper
d) aluminum

Joshua is making a trivet. A trivet is placed on a table beneath a hot pot. He knows that he must choose something that will NOT allow heat to pass easily from the hot pot to the table. Which material should Joshua use to make the trivet?
a) wood
b) aluminum
c) copper
d) silicon

Students put a small wooden ball on the end of a spring. They dropped the ball and watched it bounce up and down. One student explained that gravity was the only force making the ball move. Which of the following is a weakness of this explanation?
a) the ball is too small
b) the ball weighs very little
c) the ball fails to tough the floor
d) the ball sometimes moves upwards

A boy went camping and packed his flashlight. When it got dark, he tried to turn on the flashlight; however, it didn't work. There are several reasons why it would not work. All of the following are reasons the flashlight might not work EXCEPT
a) old batteries
b) scratched lens covering the lightbulb
c) switch was not turned to ON
d) broken lightbulb

Which of the following materials are good conductors of heat, sound, and electricity?
a) wood and glass
b) plastic and wood
c) copper and aluminum
d) rubber and cotton

Students wanted to know if the mass of an object would affect how fast it fell. The students needed to accurately measure the height they would drop the object from and the mass of the object. Which two tools did the students use to get this informat
a) balance and meter stick
b) graduated cylinder and balance
c) beaker and graduated cylinder
d) tongs and measuring cup

Matt and Pam placed boards on the curb to race their identical remote control cars on. Matt's board had a rough surface. Pam's board was smooth. Pam's car won 5 out of 5 races. Pam's car was faster than Matt's because of:
a) tension
b) pressure
c) friction
d) gravity

Walkie-talkies and remote-control cars require batteries to work. Which type of energy is used to power these kinds of toys?
a) heat energy
b) light energy
c) sound energy
d) electrical energy

Most household appliances, such as toasters and blenders, must be plugged into a socket to work. Which type of energy provides power for these appliances?
a) light
b) sound
c) electrical
d) mechanical

Which forms of energy from the Sun reach the Earth?
a) light and mechanical
b) thermal and electrical
c) light and thermal
d) mechanical and thermal

Which of the following items will best allow energy to flow through an electric circuit?
a) wooden craft stick
b) glass candy dish
c) flexible drinking straw
d) retractable metal antenna

A girl turned the light off and went to bed. She remembered she had accidentally left her glass of ice water on the counter. When she got up the next morning, the ice had melted. What form of energy caused the ice to melt?
a) sound energy
b) thermal energy
c) light energy
d) mechanical energy

Which form of energy is demonstrated when a woman pushes a wheelchair?
a) mechanical
b) electrical
c) thermal
d) light

Which of the following is the best example of a student using electrical energy?
a) Using scissors to cut a piece of yarn
b) Writing down the homework assignment
c) Knocking on the classroom door
d) Turning on the light in the classroom

A teacher attaches pictures to the dry-erase board using adhesive tape during a sorting activity. The next day, one of the pictures was found on the ground. Which force acted on the picture, causing it to fall?
a) friction
b) magnetism
c) gravity
d) evaporation

What form of energy is being used when a person pushes heavy boxes across the floor?
a) electrical energy
b) mechanical energy
c) heat energy
d) sound energy

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