The question asks to identify the mode of heat transfer that occurs through a solid object without any physical movement of the object itself. This points to a specific mechanism of heat transfer where energy is passed from one particle to another within the material.
Correct Option: A) Conduction is the process of heat transfer through a solid object without any bulk motion of the object. Heat is transferred by the vibration and collision of particles within the material.
This question asks about the primary mode of heat transfer from the Sun to the Earth. We need to understand the different methods of heat transfer and which one is applicable in the vacuum of space.
Therefore, radiation is the only viable method for heat transfer from the Sun to the Earth across the vacuum of space.
Correct Option: C) Radiation
The question asks for the SI unit of heat energy. We need to identify the standard unit for energy within the International System of Units.
C) Joule — The Joule (\(J\)) is the SI derived unit of energy, work, or amount of heat. It is defined as the energy transferred to an object when a force of one Newton acts on that object in the direction of the force's motion through a distance of one meter (\(1 \text{ J} = 1 \text{ N} \cdot \text{m}\)).
The question asks for the best description of convection. We need to recall the definitions of different modes of heat transfer: conduction, convection, and radiation, and then compare them with the given options.
D) Heat transfer through a fluid by the movement of the fluid
This option accurately defines convection. In convection, heat is transferred by the actual movement of the heated particles of a fluid (liquid or gas). For example, boiling water or the circulation of air in a room are common examples of heat transfer by convection.
The question asks to identify a good conductor of heat among the given options. We need to understand the concept of heat conduction and classify the materials accordingly.
Correct Option: B) Copper is a metal and metals are known for their excellent thermal conductivity due to the presence of free electrons that can efficiently transfer heat energy.
The question asks for the specific term that defines the amount of heat required to change the temperature of a unit mass (1 gram) of a substance by 1 degree Celsius. We need to identify the correct thermodynamic property among the given options.
C) Specific heat capacity is the amount of heat required to change the temperature of 1 gram of a substance by 1 degree Celsius. It is an intensive property, meaning it does not depend on the amount of substance.