SCI Exam Grade 7

The increase in the sizes of objects when they are hot is called ………………… .

Which of the following gives out the most heat?

• A light bulb

• The Sun

• A candle

• A Bunsen burner

How are Eskimos able to live and survive in igloos?

• Ice is a good heat insulator

• Igloos are white in color.

• Eskimos have low body temperature.

• Snow is a source of energy.

An automatic fire alarm uses a ……………… strip to switch on the electric bell when there is a fire.

Steel pins used to join pieces of metal tightly together is called ……………… .

The increase and decrease of temperature when an object is heated or cooled depends on the

• mass of the object.

• substance the subject is made from

• state of matter

• amount of energy transferred

• methods of heat transfer

The amount of heat required to increase the temperature of 1 kg of a substance by 1 degree Celsius is called …………………………… 

When two substances in physical contact have the same temperature, they are said to be in …………………………

…………………………… is the process in which heat is transferred through a vacuum.

• Radiation

• Conduction

• Convection

• Connection

When matter loses heat, it will ………………… and its size or volume will become smaller.

• contract

• expand

• melt

• break