Grade 7 NATURAL SCIENCE Revision (Term 3) Questions with Verified Answers |
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What does the law of conservation of energy state? Energy cannot be created or destroyed,
but can be transferred from one system to another or converted from one form to another.
TRUE or FALSE
Coal in South Africa is use to make electricity, petrol and other synthetic fuels. true
With a doorbell, electrical energy in the system is converted to _________ energy. sound
TRUE or FALSE
The Sun is the most important source of energy. true
Thermal energy is energy produced by ____ . heat
Heat is always transferred from the hotter place to the ________ place. cooler
When does heat transfer stop? When both objects have the same temperature.
What protects earth from heating up to the temperature of the sun? the atmosphere
________ is the transfer of heat between objects that are in direct physical contact with each
other. conduction
TRUE or FALSE
Conduction of heat cannot take place between a solid and a liquid or a solid and a gas. false
Guaranteed Success
What does the law of conservation of energy state? Energy cannot be created or destroyed,
but can be transferred from one system to another or converted from one form to another.
TRUE or FALSE
Coal in South Africa is use to make electricity, petrol and other synthetic fuels. true
With a doorbell, electrical energy in the system is converted to _________ energy. sound
TRUE or FALSE
The Sun is the most important source of energy. true
Thermal energy is energy produced by ____ . heat
Heat is always transferred from the hotter place to the ________ place. cooler
When does heat transfer stop? When both objects have the same temperature.
What protects earth from heating up to the temperature of the sun? the atmosphere
________ is the transfer of heat between objects that are in direct physical contact with each
other. conduction
TRUE or FALSE
Conduction of heat cannot take place between a solid and a liquid or a solid and a gas. false
