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

_____ is the melting point of the tungsten.

  1. 2000 degrees Celsius

  2. 3000 degrees Celsius

  3. 1000 degrees Celsius

  4. 4000 degrees Celsius
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tungsten has the highest melting point of all pure metals, which is approximately 3422 degrees Celsius. Among the choices, 3000 is the closest approximation.

Multiple choice

At which temprature is the density of water maximum?

  1. 1000C

  2. 00C

  3. Beyond 40C

  4. 40C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 On heating from 0oC upto 4oC its volume decreases, reaching a minimum at 4oC, such that the density of water is maximum at 4oC. On heating further, water behaves like any other liquid. Similarly, during cooling process, the volume of water decreases up to 4oC, reaching a minimum at 4oC. If further cooled upto 0o C, its volume increases instead of decreasing and hence, density of water at 0oC is lesser than that at 4oC.

Multiple choice

At which temperature water has maximum density?

  1. 100oC

  2. 4oC

  3. 0oC

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

Water reaches its maximum density at 4 degrees Celsius. Below this temperature, water molecules form a crystalline structure that occupies more volume, decreasing density.

Multiple choice

Boiling point of NaCl is ______.

  1. 1400°C

  2. 1413°C

  3. 1448°C

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

The boiling point of sodium chloride (NaCl) is approximately 1413 degrees Celsius.

Multiple choice

What is melting point of ice?

  1. 100 °C

  2. 0 °C

  3. 273 K

  4. b & c both.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The melting point of ice is 0 degrees Celsius, which is equivalent to 273.15 Kelvin (often rounded to 273 K). Therefore, both B and C are correct.

Multiple choice

Water has maximum density at

  1. 0oC

  2. Room temperature

  3. 100oC

  4. 4oC
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water attains its maximum density at about 4°C because it is at that temperature hydrogen bonds form. 

Multiple choice

Which of the following particles will have the highest energy?

  1. Particles in water at 0°C

  2. Particles in water at -273 K

  3. Particles in ice at 0°C

  4. Particles in ice at -273 K
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Melting is the process of conversion of solid into liquid and the amount of heat energy required to convert 1 kg of solid to liquid at atmospheric pressure at its melting point is called latent heat of fusion. When ice at 0oC melts to form water, it absorbs extra heat in the form of latent heat of fusion, i.e. water at 0oC has more heat than ice. Water exists as ice at -273 K; it will have the lowest energy at this temperature.