Homework Practice

Printable assignment

Final Assessment: Heat

Heat Basics and Measurement

Question 1mcq

When a hot steel glass is kept on a cooler table, heat flows mainly from?

A.The hot glass to the cooler table

B.The cooler table to the hot glass only

C.Both objects without any temperature difference

D.The table to air only, never to the glass

Question 2mcq

Which quantity is measured in degree Celsius in this chapter?

A.Mass

B.Temperature

C.Length

D.Heat conductor thickness only

Question 3mcq

Which thermometer is more suitable for measuring the temperature of boiling water in a lab?

A.Clinical thermometer only

B.Measuring tape

C.Laboratory thermometer

D.Spring balance

Question 4mcq

Why should the bulb of a laboratory thermometer be surrounded by the liquid whose temperature is being measured?

A.So the glass tube becomes shorter.

B.So the reading becomes independent of liquid temperature.

C.So the thermometer measures only colour.

D.So the bulb reaches the liquid’s temperature and gives a proper reading.

Question 5mcq

Which process transfers heat in solids mainly without bulk movement of the material?

A.Conduction

B.Convection

C.Radiation only

D.Digestion

Question 6mcq

Which process requires movement of a fluid such as air or water?

A.Conduction in a metal rod

B.Convection

C.Radiation from the Sun

D.Reflection from a mirror only

Transfer and Materials

Question 7mcq

A person feels heat from a bonfire even without touching it. Which transfer method is most important?

A.Conduction through the person’s shoes

B.Convection inside a metal spoon

C.Radiation

D.Scouring

Question 8mcq

Which pair contains poor conductors of heat?

A.Copper and aluminium

B.Iron and steel

C.Silver and copper

D.Wood and plastic

Question 9mcq

Why is the base of many cooking vessels made of metal?

A.Metal conducts heat quickly to the food.

B.Metal prevents all heat transfer.

C.Metal changes food into fibre.

D.Metal always remains cold on a flame.

Question 10mcq

In a sea breeze diagram, arrows near the ground point from sea to land. What time is most likely?

A.Midnight in all cases

B.Daytime

C.Only during snowfall

D.No time, because air never moves

Question 11mcq

Why does air rise above land during a daytime sea breeze?

A.Cold air over land becomes heavier and rises.

B.Sea water becomes solid and pushes air up.

C.Air over warm land becomes warmer, expands and becomes less dense.

D.Radiation cannot heat land.

Question 12mcq

Why are quilts warm even though cotton itself is not as warm as wool?

A.They conduct heat rapidly away from the body.

B.They produce heat by photosynthesis.

C.They contain liquid metal.

D.They trap air in the cotton filling and layers.

Weather, Clothing and Data

Question 13mcq

Why might a black shirt feel hotter than a white shirt in the same sunlight?

A.Black surfaces absorb more radiant heat.

B.White surfaces absorb all radiation.

C.Colour has no effect on heat absorption.

D.Black cloth is always made of wool.

Question 14mcq

A student reads a thermometer at eye level. Why is this good practice?

A.It changes Celsius into kilograms.

B.It reduces reading error caused by viewing the scale from an angle.

C.It makes the liquid rise faster.

D.It removes the need for a bulb.

Question 15mcq

Four readings of a cooling cup are

80^\circ C

65^\circ C

52^\circ C

43^\circ C

. Which conclusion is best?

A.The cup is gaining heat continuously.

B.The thermometer is measuring the cup’s mass.

C.The cup is losing heat to its surroundings.

D.The temperature is constant.

Question 16mcq

Why should we not use a bare metal rod to stir very hot liquid for a long time?

A.Metal is a perfect insulator.

B.Metal cannot become hot.

C.Hot liquid stops conduction completely.

D.Heat conducts along the metal and can burn the hand.

Question 17mcq

A lunch box has an insulating layer. What is its purpose?

A.To reduce heat exchange with the surroundings

B.To increase heat loss as fast as possible

C.To measure exact temperature every second

D.To turn food into steam always

Question 18mcq

Two objects have temperatures

60^\circ C

and

30^\circ C

. What happens when they touch?

A.Heat flows from the colder object to the hotter object.

B.Heat flows from the

60^\circ C

object to the

30^\circ C

object.

C.No heat can flow because both have temperature.

D.Temperature flows as a liquid from one to the other.

Everyday Heat Reasoning

Question 19mcq

A student says, “A clinical thermometer should be used to measure the flame temperature of a burner.” What is wrong?

A.Clinical thermometers measure only length, not temperature.

B.A flame temperature is always below body temperature.

C.A clinical thermometer has a limited body-temperature range and is not meant for flames.

D.The statement is correct and safe.

Question 20mcq

In a room heater, warm air rises and cooler air comes near the heater. Which process distributes heat through the room?

A.Conduction through empty space

B.Only radiation inside metal wires

C.Neutralisation

D.Convection

Question 21mcq

Why does a tiled floor feel colder than a wooden floor at the same room temperature?

A.Tile conducts heat away from the feet faster than wood.

B.Tile is always at a lower temperature than wood.

C.Wood conducts heat away faster than tile.

D.Feet cannot lose heat to tile.

Question 22mcq

Which statement correctly compares daytime heating of land and sea?

A.Sea always heats faster than land.

B.Land heats up faster than sea.

C.Land and sea never exchange heat with air.

D.Only sea absorbs sunlight.

Question 23mcq

A climber chooses several loose layers instead of one tight thin shirt. What heat principle supports this?

A.Layers remove all air and increase cooling.

B.Loose layers make the body temperature fall to room temperature.

C.Layers trap air, reducing heat loss by conduction and convection.

D.Clothing colour is the only factor in warmth.

Question 24mcq

Case: Tea is poured into two cups, one steel and one ceramic. The steel cup feels hot sooner. What is the best explanation?

A.Ceramic produces cold by itself.

B.Steel has no temperature.

C.Tea in steel is always hotter than tea in ceramic even when poured together.

D.Steel conducts heat faster than ceramic.