Olympiad Test: Heat - RRB Group D / RPF Constable General Science Free

Heat transfer in steel rod is by the process of conduction because in metal heat transfer occurs by conduction.

With increase in heat energy the particles of matters start vibrating faster that increase the temperature of the body.

those substances that do not conduct heat are called insulator. Copper, aluminium and graphite is conductor but air is insulator.

Normal human body temperature typically ranges around 36°C to 37.5°C, with an average of approximately 37°C. This can vary slightly depending on factors such as:

• Age
• Sex
• Time of day
• Individual health conditions

For example:

• Body temperature tends to be lower in the morning.
• Body temperature is generally higher in the evening.

It's important to note that any measurement outside this range may indicate:

• Fever (if above normal levels)
• Hypothermia (if below normal levels)

Wooden spoon is poor conductor of heat so; a wooden spoon dipped in cup of ice-cream does not become cold.

The bottom of stainless steel pan has copper as copper is better conductor of heat to cook the food faster.

Heat is indeed a form of energy, specifically thermal energy. It is transferred from one body to another due to a temperature difference and causes changes in the objects it interacts with, such as:

• Raising their temperature
• Changing their state (e.g., melting or vaporising)

Metals are best conductor of heat. Metal transfers the heats by conduction in which particles are close to each other.

To convert a temperature from Celsius to Kelvin, follow this simple formula:

• Add 273.15 to the Celsius temperature.

For example:

• 10°C + 273.15 = 283.15 K
• This is approximately 283 K.

Cotton clothes are preferred in summer because cotton clothes absorb sweats and make us more comfortable.

During day time near costal area wind blows from land to sea called land breeze.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

In thermometer mercury is used because it do not stick with wall of container, have shiny appearance and expand uniformly on heating.

To convert a temperature from Celsius to Kelvin, we use the formula:

Kelvin = Celsius + 273.15

Applying this to 25°C:

• 25°C + 273.15 = 298.15 K

Rounded to a whole number, 25°C is approximately 298 K.

Liquid and gas transfer the heat by the process of convection. The hotter molecules in contact of hot object heat up and move upward to transfer the heat.

Metals are good conductor of heat as the particle of metals are in contact of each other to transfer the heat by conduction.

Woollen clothes keep us warm in winter because air trapped between threads act as insulator to prevent heat loss of the body.

The degree of hotness or coldness is referred to as temperature.

Temperature is a measure of how hot or cold something is and is influenced by the following factors:

• Energy: An increase in energy leads to a rise in temperature.
• Heat Transfer: The movement of heat can change the temperature of an object.
• Environmental Conditions: Surrounding conditions can also affect temperature readings.

Understanding temperature is essential in various fields, including science, medicine, and meteorology.

Sun’s light reaches to earth surface through radiation as no medium is available from sun to earth to conduct heat.

The temperature at which pure water start changing into water vapour is called boiling point. Boiling point of pure water is 100⁰C.