Physics

Thermal Properties of Matter

274 Questions

Thermal properties of matter examine how substances react to heat, covering concepts like temperature, specific heat, and phase changes. This topic is regularly tested in the physics and general science sections of competitive exams. Use this collection to solve numericals on heat transfer, thermal equilibrium, and melting points.

Heat transfer and mixingMelting and freezing pointsThermal expansion and densityTriple point of waterCarnot cycle applications

Thermal Properties of Matter Questions

Multiple choice geography precipitation elements of weather and climate :rainfall and air pressure forms of precipitation moisture in atmosphere

 As per Celsius scale, the freezing point of water is ________ degree and the boiling point is ___  degree Celsius.

  1. Zero, 100

  2. Zero, 200

  3. Zero, 300

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Celsius is the scale which measures temperature. It was developed by Swedish astronomer Andres Celsius in 1742. Freezing point of the water is the temperature at which water starts converting into ice. As per the Celsius scale, zero degrees is the freezing point of the water. The boiling point is the temperature at which water starts converting into vapors. As per Celsius scale, 100 degrees is the boiling point of the water.

Multiple choice evs weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate atmosphere and its components

If one litre of water at $\displaystyle { 25 }^{ \circ  }C$ is mixed with one litre of water at $\displaystyle { 45 }^{ \circ  }C$ the temperature of the water will be

  1. $\displaystyle { 70 }^{ \circ }C$
  2. $\displaystyle { 20 }^{ \circ }C$
  3. $\displaystyle { <25 }^{ \circ }C$
  4. $\displaystyle >{ 25 }^{ \circ }C\& <{ 45 }^{ \circ }C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The temperature of the mixture would be $\displaystyle >{ 25 }^{ \circ  }C&amp; <{ 45 }^{ \circ  }C$, as there would be transfer of heat in between  water molecules from higher temperature to lower temperature.

Multiple choice physics measurements and units kinds of units fundamental quantities standardized measurement

The specific heat capacity of water in SI unit is :

  1. $4.2 Jg^{-1}K^{-1}$
  2. $42 Jg^{-1}K^{-1}$
  3. $420 J kg^{-1}K^{-1}$
  4. $4200 J kg^{-1}K^{-1}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The specific heat capacity  of a substance is the heat needed to raise

the temperature of 1 kg of the substance by 1K (or by ${1}^{0}C$).
The specific heat capacity of water is $4200 J{kg}^{-1}{K}^{-1}$.

Multiple choice physics energy and its forms idea of energy introduction to work and energy work and energy

Define the term calorie. How is it related to joule ?

  1. The amount of energy requires to raise the temperature of 1 gram of water by 1° Celsius, 1 Cal = 4.18 J
    <a href="http://scienceworld.wolfram.com/physics/Celsius.html&quot;&gt;&lt;/a>

  2. The amount of energy requires to raise the temperature of 1 gram of water by 1 Kelvin, 4.18 Cal = 1 J

  3. The amount of energy requires to raise the temperature of 1 gram of water by 1 Fahrenheit, 4.18 Cal = 1 J

  4. The amount of energy requires to raise the temperature of 1 gram of ether by 1° Celsius, 1 Cal = 4.18 J
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The term calorie can be defined as the energy needed to raise the temperature of 1 gram of water by $ 1$ °C. 
$1 \ cal = 4.18 \ J$
Multiple choice chemistry chemical bonding and structure coordinate bond types of bonds and properties chemical bond and chemical equation

The pH of pure water at 25°C and 35°C are 7 and 6 respectively. The heat of formation  of water from ${H^ - }$  and $O{H^ - }$ will be :

  1. -77.11

  2. -84.55

  3. -92.36

  4. -66.25
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The auto-ionization of water is H2O <-> H+ + OH-. The heat of formation is related to the change in equilibrium constant (Kw) with temperature. The value -77.11 kJ/mol is the standard enthalpy change for this process.

Multiple choice physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

On heating water from $0^0 C$ to $100^0 C$ its volume 

  1. Increases at each $^0 C$
  2. First increase till $4^0 C$ and then decreases
  3. First decrease till $4^0 C$ and then increases

  4. Remains same
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water exhibits anomalous expansion. Its density is maximum at 4 degrees Celsius, meaning its volume is minimum at that temperature. Thus, as it heats from 0 to 4 degrees, it contracts (volume decreases), and from 4 to 100 degrees, it expands (volume increases).

Multiple choice chemistry energetics and thermochemistry bond energies and enthalpy changes bond enthalpies enthalpies for different types of reactions

A vessel contains 100 litres of a liquid x. Heat is supplied to the liquid in such a fashion that, heat gives a change in enthalpy. The volume of the liquid increases by 2 litres. If the external pressure is one atm, and 202.6 Joules of heat supplied, then [U $\rightarrow$ total internal energy] :

  1. $\Delta U=0, \Delta H=0$
  2. $\Delta U=+202.6 J, \Delta H=+202.6 J$
  3. $\Delta U=-202.6 J, \Delta H=-202.6 J$
  4. $\Delta U=0, \Delta H=+202.6 L $
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice chemistry hard water and soft water heavy water study of heavy water hydrogen and its compounds

Heavy water $(D _{2}O)$ freezes at:

  1. $0^\circ C$
  2. $-3.8^\circ C$
  3. $0.8^\circ C$
  4. $3.82^\circ C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Freezing point of heavy water is $3.82^oC$. Heavy water is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium, rather than the common hydrogen-$1$ isotope that makes up most of the hydrogen in regular water.

Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

Specific heat of water is:

  1. very low

  2. medium

  3. sometimes high and sometimes low

  4. none of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The specific heat of water is $1$ $calorie/gm^oC=4.186$ $Joule/gm^oC$, which is higher than another common substance.

So, none of the above statement is true for specific heat of water.