Heat and Electricity

The following statements about charging by friction are true EXCEPT _____.

• Amount of gained and lost electron is equal.

• Material losing electron is positively charge and material-gaining electron is neutral

• Material losing electron is positively charge and material-gaining electron is negatively charged

• When you rub a glass rod to silk, the glass loses an electron, and it becomes positively charged and silk gain electron and is negatively charged.

Why do metallic objects feel cooler to touch than wooden objects inside an air-conditioned room?

• Heat tends to flow from metal to wood.

• Metal conducts heat better than wood.

• Wood contains more heat than a metal of the same mass.

• The human body resembles wood more closely than it resembles metal.

How can we prevent radiation?

• by using glass walls

• by using black painted glass walls

• by using metal walls

• by using silver painted glass walls

How does heat from the sun reach the Earth?

• through conduction

• through insulation

• through convection

• through radiation

What will happen if warm air rises and cool air falls to the space?

• formation of air current

• formation of convection current

• formation of conduction current

• formation of radiation current

Earthing means that the circuit is physically connected ___________.

• to the circuit

• to the ground

• to the wall

• to the wire

Which of the following best describes “hotness or coldness” of a body?

• conductivity

• energy

• heat

• temperature

Why do most objects do NOT have an electric charge?

• It is because there are fewer electrons in the object.

• It is because the object does not possess electrons.

• It can be because the negative charges are not equal.

• It is because there is a balance of electrons and protons in the object

Which of the following types of charging would create an opposite charge, without contact, and is considered temporary since electrons do not transfer between objects?

• Conduction

• Earthing

• Induction

• Grounding

Which of the type of charging processes best describes charged aluminum metal plates when touched to a neutral metal sphere in a rice cooker?

• Charging by conduction

• Charging by induction

• Charging by friction

• Electric circuit