REVISION Form 4 (Heat)

If heat is lost by an object, the temperature of the object will

• rise

• fall

• remains unchanged

When a piece of copper is heated, which of the following physical quantities remains constant?

• surface are

• volume

• density

• mass

The figure shows two objects P and Q which are in thermal contact with each other. Which of the following statements is true?

• Heat flows from object P to object Q only.

• Heat flows from object Q to object P only.

• Heat flows in both directions.

• The net flow of heat is zero.

Which of the following statements about heat is true?

• Heat is not a physical quantity.

• Heat is measured in ⁰C.

• Heat is a form of energy.

• Heat is the degree of hotness of an object.

The diagram shows two bodies X and Y which are in thermal equilibrium with each other. Which of the following statements is true?

• The temperature of X and Y is the same

• The weight of X and Y is the same.

• The volume of X and Y is the same.

• Both X and Y must be solids.

The diagram shows part of the scale of a thermometer. What is the reading as shown?

• 23.2 ⁰C

• 23.4 ⁰C

• 23.8 ⁰C

• 24.4 ⁰C

Which instrument can be used to give a reading of 35⁰C?

• Ammeter

• Bourdon Gauge

• Manometer

• Thermometer

“The specific heat capacity of metal R is 450 J kg^{-1 0}C^-1.” The statement means that

• 450 J of heat is required to increase the temperature of metal R by 1⁰C.

• 450 J of heat is required to increase the temperature of 1 kg of metal R by 1⁰C.

• 450 J of heat is required to melt 1 kg of metal R.

• 450 J of heat is required to increase 1 g of metal R form 0⁰C to 100⁰C.

Lead has a higher specific heat capacity than copper. If a piece of lead of mass 200 g and a piece of copper of the same mass is heated at the same rate, which of the following statements is true?

• The rise in temperature of copper is greater than the rise in temperature of lead

• The rise in temperature of lead is greater than the rise in temperature of copper.

• Both metals experienced the same increase in temperature.

When an object is heated, the increase in its temperature does not depend on

• The quantity of heat received

• The shape of the object.

• The mass of the object.

• The specific heat capacity of the object.