Thermal Properties of Matter - Physics For Class IX (Science Group) - Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map

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Physics For Class IX (Science Group)
UNIT 9: THERMAL PROPERTIES OF MATTER
Multiple Choice Questions (MCQs) , Fill in the blanks and Concept Map

Section (A) Multiple Choice Questions (MCQs)

Tick mark (✓) the correct answer:
01. Heat is the form of:
(a) Pressure
(b) Weight
(c) Energy ✓
(d) All

02. Heat capacity is the product of mass and ___.
(a) Boiling point
(b) Freezing point
(c) Energy
(d) Specific heat of material ✓

03. The amount of heat needed to convert a substance from liquid to gas is called:
(a) Heat of vaporization ✓
(b) Specific heat
(c) Latent heat of fusion
(d) All

04. Thermal energy transfer required per unit mass to increase the temperature by 1°C or 1 K is called:
(a) Latent heat of Vaporization
(b) Specific heat capacity ✓
(c) Latent heat of fusion
(d) Thermal capacity

05. A fixed temperature at which a pure liquid boils is called:
(a) Melting point
(b) Freezing point
(c) Boiling point ✓
(d) Both 'a' and 'b'

06. The melting point of ice at normal atmospheric pressure is:
(a) 0 °C ✓
(b) 0 K
(c) 100 °C
(d) Both 'a' and 'b'

07. Thermal energy transfer required to change a solid into liquid without changing its temperature is called:
(a) Latent heat of Fusion ✓
(b) Latent heat of vaporization
(c)Latent heat of boiling
(d) Specific heat capacity

08. Thermal energy transfer required to change a liquid into gas without changing its temperature is called:
(a) Latent heat of freezing
(b) Latent heat of vaporization ✓
(c) Latent heat of boiling
(d) Latent heat of melting

09. Evaporation can occur at:
(a) Freezing point
(b) Melting point
(c) Boiling point
(d) All temperatures ✓

10. Rate of evaporation of a liquid can be increased by:
(a) increasing humidity
(b) decreasing temperature
(c) increasing its boiling point ✓
(d) decreasing atmospheric pressure

11. Linear thermal expansion of a solid depend upon:
(a) increasing in temperature
(b) original length
(c) properties of material
(d) all of these ✓

12. The S.I unit of heat is:
(a) calorie
(b) joule ✓
(c) Celsius
(d) Kelvin

13. It is the degree of hotness of a body:
(a) Heat
(b) Specific heat
(c) Temperature ✓
(d) Latent heat

14. Thermometer is a device, used to measure:
(a) temperature ✓
(b) heat
(c) specific heat
(d) latent heat

15. This scale of temperature is mostly used for environmental measurements:
(a) Kelvin scale
(b) Fahrenheit scale
(c) Celsius scale ✓
(d) Both `a' & 'b'

16. This scale of temperature is mostly used for industrial measurements:
(a) Kelvin scale ✓
(b) Fahrenheit scale
(c) Celsius scale
(d) Both 'a' & 'b'

17. Which one is correct to convert temperature from Celsius scale to Kelvin scale?
(a) K = 1.8 °C + 273
(b) K= 1.8 °C - 273
(c) K = °C - 273
(d) K = °C + 273 ✓

18. Which one is correct to convert temperature from Celsius scale to Fahrenheit scale?
(a) °F = 1.8 °C - 32
(b) °F = 1.8 °C + 32 ✓
(c) °F = 1.8 °C - 273
(d) °F = 1.8 °C + 273

19. Which one is correct to convert temperature from Fahrenheit scale to Celsius scale?
(a) °C = °F - 32 / 1.8 ✓
(b) °C = °F + 32 / 1.8
(c) °C = °F - 1.8 / 32
(d) °C = °F + 1.8 / 32

20. Specific heat of water is:
(a) 240 Jkg^-1K^-1
(b) 2400 Jkg^-1K^-1
(c) 420 Jkg^-1K^-1
(d) 4200 Jkg^-1K^-1 ✓

21. Boiling point of water is:
(a) 100 K
(b) 100 °F
(c) 100 °C ✓
(d) 92.8 °F

22. It is a term in physics that describe how much heat is added to a substance to raise its temperature by 1°C:
(a) Latent heat of Fusion
(b) Latent heat of vaporization
(c) Specific heat capacity
(d) Heat capacity ✓

23. Heat capacity depends upon the nature of material:
(a) increasing in temperature
(b) original length
(c) nature of material ✓
(d) all of these

24. Amount of heat required to raise the temperature of 1 kg of a substance through 1 °C is called:
(a) Latent heat of Fusion
(b) Latent heat of vaporization
(c) Specific heat capacity ✓
(d) Heat capacity

25. Equation of specific heat capacity 'c' is as under:
(a) Q / ΔT
(b) ΔQ / mΔT ✓
(c) ΔT / mΔQ
(d) mΔQ / ΔT

26. Joule per kilogram per Kelvin (Jkg^-1K^-1 )is the 5.1 unit of:
(a) specific heat capacity ✓
(b) heat capacity
(c) latent heat of Fusion
(d) thermal expansion

27. The heat of fusion for water at 0 °C is approximately:
(a) 2230 Joules per gram
(b) 2130 Joules per gram
(c) 1230 Joules per gram
(d) 334 Joules per gram ✓

28. The heat of vaporization for water at 100°C is about:
(a) 2230 Joules per gram ✓
(b) 2130 Joules per gram
(c) 1230 Joules per gram
(d) 334 Joules per gram

29. Wet clothes dry in sun due to the:
(a) heat capacity
(b) specific heat
(c) evaporation ✓
(d) latent heat

30. Which statement is true for evaporation?
(a) It only takes place with the supply of an external heat source.
(b) It occurs only at a certain temperature called "Boiling point".
(c) It does not cause cooling.
(d) It takes place only at the liquid surface. ✓

31. Which statement is NOT true for boiling?
(a) It only takes place with the supply of an external heat source.
(b) It does not cause cooling.
(c) No formation of bubbles ✓
(d) It takes place throughout the liquid.

32. Evaporation causes:
(a) boiling
(b) freezing
(c) fusion
(d) cooling ✓

33. Volatile liquids have:
(a) low boiling point ✓
(b) high boiling point
(c) low freezing point
(d) high freezing point

34. Which statement is NOT correct?
The rate of evaporation increases with:
(a) with the increase in temperature
(b) with the increase in wind speed
(c) with the increase in humidity ✓
(d) with the increase in surface area of liquid

35. Salty water evaporates:
(a) more faster than pure water
(b) more slowly than pure water ✓
(c) with the same rate
(d) No evaporation occurs

36: The co-efficient of volume expansion of liquids is:
(a) zero
(b) equal to that of solids
(c) greater than solids ✓
(d) less than solids

37. If "β" is the coefficient of volume expansion and "α" is the coefficient of linear expansion than:
(a) β = 2α
(b) β = 3α ✓
(c) α = 2β
(d) α = 3β

38. It is used to control temperature of ovens, irons water heaters, refrigerators, air conditioners and so on:
(a) Bimetallic thermostat ✓
(b) Rivet
(c) Radiator
(d) Mercury

Fill In The Blanks:

1.  Heat is the form of energy. 
2. Unit or SI unit of heat is Joule.
3.  Degree of hotness or coldness of a body is called as temperature.
4.  Heat that determines the direction of transfer of thermal energy is called temperature.
5.  Three different scales, Celsius , Fahrenheit and Kelvin are used for quantitative measurement of temperature.
6.  Temperature on Celsius scale is converted into Kelvin using K = °C + 273.
7.  Temperature on Celsius scale is converted to Fahrenheit using: °F=1.8 °C + 32.
8.  Thermal energy transfer required per unit mass to raise the temperature by 1 °C or 1 K is called specific heat capacity.
9.  The product of mass and specific heat capacity is called thermal capacity or heat capacity of an object.
10.  Thermal energy transfer required to change the state of a substance from solid to liquid without changing its temperature is called latent heat of fusion.
11.  Thermal energy transfer required to change the state of a substance from liquid into gas without changing its temperature is called heat of vaporization.
12.  The process in which liquid changes into gas without any external energy supply is called evaporation.
13.  Real expansion of water is the sum of apparent expansion of water and volume expansion of flask.
14.  Temperature, humidity, surface area of liquid, pressure, boiling point and moving air are the factors which affect the evaporation process of a liquid.
15.  Increase in length or size of a substance on heating is called thermal expansion.
16.  Increase in the length of a solid, when heated is called linear thermal expansion.
17.  Increase in volume of a solid, when heated is called volume thermal expansion.
18.  Volume thermal expansion of a solid depends upon increase in temperature, its original volume and properties of material.
19.  Increase in volume of a solid after heating is calculated by using ΔV = βV₀ ΔT.

CONCEPT MAP