Thermal Expansion

Calculations $ MCQ

100

A metal bar is 1.85 m long at room temperature (21°C). A worker heats the bar to a temperature of 75°C. The bar’s length increases by 1.9 mm. What is the coefficient of linear expansion of this material?  

1.9×10−5 °C−1

200

• A tank truck takes on a load of 45,725 L of gasoline in Houston, where the temperature is 28.0°C. The truck delivers its load in Minneapolis, where the temperature is -12.0°C.

How many liters of gasoline does the truck deliver?

What happened to the gasoline?

4.4´104 L The gasoline volume decreased because the temperature decreased. The mass of the gasoline remained the same.

300

A student notices that a wooden ruler keeps its shape even when moved from one desk to another. Which property of solids best explains this observation?

A. Solids can flow easily
B. Solids have a fixed shape and volume
C. Solids are slightly compressible
D. Solids change shape based on temperature

 Solids have a fixed shape and volume

400

• Why is it difficult to compress a metal ball by squeezing it with your hands?
  A. Metals have no particles
  B. The particles are far apart
  C. The particles are closely packed
  D. Metals are liquids

The particles are closely packed

500

• A student bends a plastic ruler slightly and it returns to its original shape. This means the ruler has not exceeded its_________
  A. Melting point
  B. Crystal lattice
  C. Volume expansion
  D. Elastic limit

Elastic limit

Calculations $ MCQ

100

• An iron rod heated from 30 oC to 80 oC. The final length of iron is 115 cm and the coefficient of linear expansion is 3×10-3 oC-1. What is the original length and the change in length of the iron ?

• The  original length =100 and the change in length of the iron= 15

200

• Calculate the change in length of a 100mm aluminum bar that has increased in temperature by 55⁰C.
  Take the coefficient of expansion to be 25 x 10-6

• 0.1375mm

300

When a solid iron rod is observed under a microscope, its particles appear closely packed and vibrating in place. This particle behavior mainly explains why solids_________

A. Can be poured easily
B. Have strong cohesive forces
C. Are highly compressible
D. Do not have volume

Have strong cohesive forces

400

• A metal lid on a glass jar becomes easier to open after being placed in hot water. Why does this happen?
  A. The glass contracts
  B. The metal expands due to heating
  C. The lid melts slightly
  D. The air inside escapes

The metal expands due to heating

500

• Why do metal bridges often have expansion joints?
  A. To make the bridge longer
  B. To allow metals to expand and contract safely
  C. To reduce weight
  D. To improve strength

To allow metals to expand and contract safely

Calculations $ MCQ

100

• A piece of aluminum house siding is 3.66 m long on a cold winter day of -28°C. How much longer is it on the hot summer day of 39°C?

12m

200

• The length of copper wire at 20oC is 4.5m. Calculate its new length when the temperature is 95oC. Given α = 1.7×10-5 oC-1

4.51m

300

A science teacher compares ice and water in a beaker. Ice keeps its shape while water changes shape. Why does this difference occurs?
A. Ice has weaker forces between particles
B. Water particles vibrate in fixed positions
C. Ice particles are arranged in a fixed structure
D. Water has no volume

. Ice particles are arranged in a fixed structure

400

• Railway tracks are built with small gaps between them. What is the importance of these gaps?
  A. Improve the appearance of the track
  B. Allow rainwater to drain
  C. Prevent bending due to thermal expansion
  D. Increase friction between tracks

Prevent bending due to thermal expansion

500

• Which property explains why juice can be poured but a wooden block cannot?
  A. Fixed volume
  B. Particle vibration
  C. Ability of particles to slide past each other
  D. Elasticity

Ability of particles to slide past each other

Calculations $ MCQ

100

• A piece of steel is 11.5 cm long at 22°C. It is heated to 1221°C, close to its melting temperature. How long is it?

• 5.6´10-3 m

200

• Calculate the change in temperature of an 900mm aluminum bar, that has increased in length to 901.035mm. α = 25 x 10-6

• 46⁰C

300

Which everyday object is the best example of an amorphous solid?

A. Table salt
B. Diamond
C. Glass window
D. Ice cube

. Glass window

400

• A student heats a long metal rod in the laboratory. After heating, the rod becomes slightly longer. Which factor mainly causes this change?
  A. Decrease in particle motion
  B. Increase in particle vibration
  C. Loss of particles
  D. Increase in mass

Increase in particle vibration

500

• When a solid is heated evenly, what happens first at the particle level?
  A. Particles stop moving
  B. Particles move farther apart
  C. Particles lose energy
  D. Particles disappear

Particles move farther apart

Calculations $ MCQ

100

A 400-mL glass beaker at room temperature is filled to the brim with cold water at 4.4°C. When the water warms up to 30.0°C, how much water will spill from the beaker?

2ml

200

Railway lines 25m long are being laid when the temperature is 15.gaps of 1.8cm are being left them .if  α = 12 x 10-6 .A temperature at which they will touch each other is ______

• 75oC

300

• A student says that solid particles do not move at all. Which statement best corrects this idea?
  A. Solid particles slide past each other
  B. Solid particles vibrate around fixed positions
  C. Solid particles move freely
  D. Solid particles have no energy

Solid particles vibrate around fixed positions

400

• Which situation best shows the elasticity of a solid?
  A. A glass cup breaking when dropped
  B. A rubber band returning to its original shape after stretching
  C. Clay remaining in a new shape after pressing
  D. Butter melting in the sun

A rubber band returning to its original shape after stretching

500

• Two metal rods of equal length are heated by the same temperature increase. One expands more than the other. What best explains this difference?
  A. One rod is heavier
  B. Different coefficients of linear expansion
  C. One rod is older
  D. Different volumes

Different coefficients of linear expansion