HEAT

The diagram below shows the heat effect on the bimetallic strip consisting of copper and iron. What causes this observation?

• Iron and copper are metals

• Iron contracts when heated

• Matter expands when heated

• Copper expands more than iron

Which of the following instruments used the bimetallic strip?

• Radio

• Dynamo

• Electric fan

• Automatic fire alarm

Which of the following about heat is true?

• Heat can be seen

• Heat cannot be measured

• Heat is a form of energy

• Heat is the degree of hotness of an object.

The diagram below shows an iron rod that is being heated. What type of heat flow shown above?

• Transfer

• Radiation

• Convection

• Conduction

Which of the following statements about temperature is true?

I Temperature cannot be measured

II Temperature is the degree of hotness and coldness of an object

III The S.I unit is the Kelvin (K)

IV Temperature is a form of energy

• I and II

• III and IV

• II and III

• A and IV

Which of the following about sea breeze is true?

• It occurs at night

• It blows from the land to the sea

• It occurs because land heats up faster than the sea

• It occurs because the sea is warmer than the land.

Which of the following is heat conductor?

• Mercury

• Wood

• Gloves

• Eraser

Why most of the frying pans are black in colour?

• The black frying pans are stronger and durable

• The black frying pans insulate heat better than shiny frying pans

• The black frying pans absorbs more heat

• The black frying pans released more heat

What will happen if the temperature of an object is higher?

• The mass of an object is bigger

• The heat content of an object is bigger

• The heat content of an object is slower

• The flow of heat in object is slower

Which of the surfaces is a good absorbent and heat exchanger?

• dark and dull

• Bright and shiny

• Dark and shiny

• Bright and dull