Physics - Study Mode
[#1061] Which of the following criterion is used for any metal to be used as a cooking material ?
Correct Answer
(B) More thermal conductivity
Explanation
Solution: For a metal to be used as a cooking material , it is important to have more thermal conductivity . This is because metals with high thermal conductivity quickly and evenly distribute heat, which is crucial for cooking. It allows for efficient and uniform heating of the cooking utensil, ensuring that food is cooked thoroughly and at a consistent temperature
[#1062] Heat from the sun reaches earth by the process of
Correct Answer
(C) Radiation
Explanation
Solution: Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.
[#1063] Ocean currents are an example of
Correct Answer
(A) Convection
Explanation
Solution: Ocean currents are an example of convection.
[#1064] What type of heat transfer is boiling water?
Correct Answer
(C) Convection
Explanation
Solution: When a pot of water is placed on the stove to boil, conduction heat warms up the pot, which then heats the water molecules inside. As these molecules heat, convection causes them to move away from the interior of the pot as they are replaced by cooler molecules.
[#1065] Ventilators are provided near the ceiling of the room because
Correct Answer
(B) These provide cross ventilation in the room
Explanation
Solution: Ventilators are provided near ceilings in the rooms of our houses because the air we breathe out is warm and rises out of the room through the ventilators. Cool fresh air rushes into the room through the doors and windows.