Thermal Expansion – LearnITbyTests

1. Which of the following is NOT an importance of the knowledge of Linear Expansivity?

Knowledge of Linear expansivity is used in the designing of material to ensure they are able to operate well under varying a thermal condition.

In building construction concrete is reinforced with steel because they expand at the same rate

Platinum wires are enclosed in glass for electrical insulation because they have similar linear expansivity.

The knowledge of linear expansivity is used in fractional distillation of crude oil.

Question 1 of 55

2. Why is the capillary bore of a Lab thermometer Narrow?

For low degree of accuracy

For high degree of accuracy

For decoration

To reduce cost

Question 2 of 55

3. CONVERTING kelvin to degrees C?

-273

273

-272

272

Question 3 of 55

4. Which of the following is not a property required of the liquid used in LIQUID GLASS THERMOMETER?

Must be visible

Expand or contract uniformly by a large amount over a small temperature range

Does not stick in the inside of Glass tube.

Have a narrow range of temperature possible in liquid state

Question 4 of 55

5. The key main property which makes alcohol preferable to mercury in a liquid glass thermometer is?

Alcohol has a low boiling point 78 degrees C

Alcohol has a high boiling point 78 degrees C

Alcohol has a low melting point of -115 degrees C hence preferable for measuring low melting point of systems.

Alcohol wets Glass

Question 5 of 55

6. The clinical thermometer bulb has a thin glass wall for effective heat transmission between the liquid and the source (body/object). True or False?

False

True

Maybe

None

Question 6 of 55

7. Mention the reasons why Telephone wires are loosely fixed

To allow for contraction during cold weather

To allow expansion during hot weather

to prevent any blackout

None of the above

Question 7 of 55

8. Which of the following statements does not describe the clinical thermometer?

Used mainly to measure human body temperature

Its temperature range is about 35 degrees C-43 degrees C

It has a constriction feature in the glass bore

It uses alcohol mainly

Question 8 of 55

9. Which of the following is not an application of expansion and contraction?

Separating iron fillings from sugar

Looped steam pipes

Steel bridges with one fixed end and another free

Bimetallic strip in a thermostat

Question 9 of 55

10. Boiling point of Alcohol is?

68 degrees C

78 degrees C

Question 10 of 55

11. Which among the following molecular expansion statements does NOT explain expansion of liquids compared to solids?

In liquids the force of attraction is weaker compared to solids

Liquid molecules are farther apart than in solids

When a liquid is heated in a volumetric flask, the vibration of liquid molecules increase and the liquid will occupy more space.

Liquids are more often more colourless than solids

Question 11 of 55

12. Which among the following molecular expansion statements explain expansion of solid?

Solids have a strong force of attraction among its molecules

When a solid is heated the vibrations of the molecules increase.

An increase in temperature increases the kinetic energy among solid particles and weakens its force of attraction.

All of above.

Question 12 of 55

13. Which of the following appliances does not use a thermostat?

Electric irons

Cookers

Fridges

Electric bell

Question 13 of 55

14. Which among the following molecular expansion statements explain expansion of gases?

Gas molecules have a weaker force of attraction than in liquid

Gas molecules are farther apart than in liquids and solids

When a gas is heated its molecules gain more kinetic energy and move farther apart occupying more space.

All of the above

Question 14 of 55

15. Different metals have different rate of expansion?

False

True

Maybe

None

Question 15 of 55

16. Mention the two liquids used in a liquid in Glass thermometer?

Mercury and water

Mercury and alcohol

Alcohol and oil

Mercury is used in both

Question 16 of 55

17. What is the consequence of a steam pipe designed without a loop or an expansion joint?

Continuous expansion and contraction of the steam pipe will result to breaking

No effect at all

Steam pipes will not change in shape

Steel pipes will not change in size

Question 17 of 55

18. Which of the following statements is not true when you cool down a bimetallic strip containing brass and iron on the same temperature range?

Brass will contract more than iron

Iron becomes longer than brass for the same temperature range

Bimetallic strip bends with iron on the outside of the curve

Bimetallic strip bends with brass on the outside of the curve.

Question 18 of 55

19. Which of the following is not among the effects of Anomalous expansion of water?

Icebergs

Bursting of water-pipes in winter

Weathering of rocks

Rivets

Question 19 of 55

20. CONVERTING degrees C to kelvin?

-272

273

-273

272

Question 20 of 55

21. Expansivity is a measure of the tendency of a particular material to expand?

True

False

Maybe

None

Question 21 of 55

22. Concrete with a linear expansivity of 11/K x 10 to the power of -6 expands more than steel with a linear expansivity of 11/K x 10 to the power of -6

True

False

Maybe

None

Question 22 of 55

23. When a metal contracts the following occur except?

Decrease in volume

Change in mass

No change in mass

Increase in density

Question 23 of 55

24. The key importance of the CONSTRICTION feature in a clinical thermometer?

Enables the temperature of a human body to be accurately reads even when the thermometer is out of contact with the heat source (body) and the mercury in the bulb has contracted.

Enables the efficient expansion of mercury in the thermometer

Enables the efficient contraction of mercury in the thermometer

all of the above

Question 24 of 55

25. Which of the following describes the anomalous expansion of water?

Water contracts when its temperature is raised from 0 degrees C to about 4 degrees C

Above 4 degrees C the water expands with increase in temperature

As water contracts between 0 degrees C - 4 degrees C its volume is reduced hence it has the maximum density slighter higher than 1 g/cm3.

All of above

Question 25 of 55

26. Thermostat is a device used to maintain a steady temperature in devices that need temperature regulation i.e. Air conditioner

True

False

Maybe

None

Question 26 of 55

27. Freezing point of alcohol is?

115 degrees C

-110 degrees C

-15 degrees C

-115 degrees C

Question 27 of 55

28. SI UNIT of Temperature is Kelvin. True or False?

True

False

Maybe

None

Question 28 of 55

29. Which among the following properties of alcohol is NOT correct?

Alcohol is colourless and wets glass

Alcohol expands slightly irregularly

Alcohol has a low boiling point of 78 degrees C and low melting point of -115 degrees C

Alcohol is not transparent and does not need any coloring to be visible.

Question 29 of 55

30. Freezing point of mercury is?

-39 degrees C

-35 degrees C

0 degrees C

-15 degrees C

Question 30 of 55

31. Which thermometer has a coiled strip with one fixed end and the other free end attached to a pointer?

Sixs minimum and maximum thermometer

Bimetallic strip

Bimetallic thermometer

Clinical thermometer

Question 31 of 55

32. Clinical thermometer temperature range is between 35 degrees C - 43 degrees C which makes it suitable to measure body temperature since a healthy person temperature is 37 degrees C. True or False?

True

False

Maybe

None

Question 32 of 55

33. Which thermometer is used to record the maximum and minimum temperature recorded in an area?

Clinical thermometer

Lab thermometer

Liquid in glass thermometer

Sixs maximum and minimum thermometer

Question 33 of 55

34. The temperature of a body/object is the degree of coldness or hotness of a body/object:

True

False

Maybe

None

Question 34 of 55

35. Absolute zero is?

The temperature at which the energy of particles in a material is zero

The temperature at which a material melts

The temperature at which a material evaporates

The temperature at which a material sublimes

Question 35 of 55

36. Temperature is among the 7 basic physical quantities

True

False

Maybe

None

Question 36 of 55

37. Temperature is a?

Vector quantity

Scalar

matrix

None of the above

Question 37 of 55

38. What is the effect of impurities when added in a liquid which is about to be heated i.e. salt in water?

No effect

It would raise the boiling point

It will decrease the melting point

None of the above

Question 38 of 55

39. Different liquids expand more than others?

False

True

Maybe

None

Question 39 of 55

40. Which of the following liquids expand more than the rest?

Mercury

Water

Alcohol

Oil

Question 40 of 55

41. Aluminum with a linear expansivity of 26/K x 10 to the power of -6 expands more than steel with a linear expansivity of 11/K x 10 to the power of -6

False

True

Maybe

None

Question 41 of 55

42. Which of the following occurs when you heat a metal e.g. iron and let it cool?

No change in mass

Change in volume

Change in density

All of above

Question 42 of 55

43. Why do steel bridges have one end fixed and the other end free?

To allow expansion and contraction of the steel bridges during warm and cold weather respectively.

For accommodating the weight of the people and cars

For decoration

for security issues

Question 43 of 55

44. Explain why a grown person is able to wear a 3 year old kids finger ring when it is heated but when the ring is left for a while it is impossible for the man to put on the ring

When the ring is heated it expands and increases hence the man able to put it on.

When the ring is heated it decreases in size.

When the ring is left for a while it gets cold and decreases in size {contacts} hence the man is not able to put it on.

all of the above

Question 44 of 55

45. What is a bimetallic strip?

Two metals of different linear expansivity riveted together

Four or metals riveted together

chineese metals bought at cheap price

None of the above

Question 45 of 55

46. Why are railway-line bolt holes oval in shape?

To allow expansion of bolts

To allow contraction of bolts

To allow free expansion and contraction of the rails with varying temperature

No idea

Question 46 of 55

47. Name 3 common features of a clinical thermometer or lab thermometer?

Capillary bore

Glass stem

Bulb

All of the above

Question 47 of 55

48. A Thermometer is an instrument used for measuring temperature?

True

False

Maybe

None of above

Question 48 of 55

49. Which among the following properties of mercury is incorrect?

Mercury expands regularly

Mercury is opaque and slivery

Mercury has a high boiling point of 357 degrees C and high melting point of -39 degrees C

Mercury is a poor thermal conductor

Question 49 of 55

50. Which of the following physics experiments explain the expansion and contraction of solids?

Ball and ring experiment

Diffusion through porous materials

Bar and gauge experiment

None of the above

Question 50 of 55

51. Which of the following statements is NOT true when you heat up a bimetallic strip containing Brass and Iron on the same temperature range

Brass will expand more than iron since it has a high linear expansivity

Bimetallic strip bends with brass on the outside of the curve

Brass becomes longer than iron

Iron becomes longer than brass for the same temperature change.

Question 51 of 55

52. Boiling point of mercury is?

360 degrees C

3 degrees C

357 degrees C

100 degrees C

Question 52 of 55

53. When a metal expands the following occur except?

Increase in volume

Change in mass

No change in mass

Decrease in density

Question 53 of 55

54. What are the two main purposes of the glass stem of a thermometer?

It surrounds the capillary bore

It serves as the magnifying glass for easy reading of the scale

To make the thermometer beautiful in design

None of the above

Question 54 of 55

55. What is the key main property which makes MERCURY preferable to ALCOHOL in a liquid glass thermometer?

Mercury has a high boiling point 357 degrees C hence preferable to measure high boiling points

Mercury has a high melting point -39 degrees C hence preferable

Mercury wets glass

Mercury is a bad thermal conductor

Question 55 of 55

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