A scalar quantity is a physical quantity that has only magnitude and no direction. Temperature is a scalar quantity as it only represents the degree of hotness of a body and does not have any direction associated with it.
Q: Which of the following is NOT a result of heat energy being supplied to a substance?
A.The temperature of the substance rises.
B.The substance may change its state from solid to liquid or from liquid to gas.
C.The substance will contract when heated.
D.The substance will expand when heated.
Correct Option: CExplanation:
When heat energy is supplied to a substance, the temperature of the substance rises and it may change its state from solid to liquid or from liquid to gas. Additionally, the substance will expand when heated. The substance will not contract when heated.
Q: What is the relationship between Celsius and Kelvin temperature scales?
A.K = (C + 32) × 5/9
B.K = C - 273
C.K = C + 273
D.K = (C × 9/5) + 32
Correct Option: CExplanation:
The relationship between Celsius and Kelvin temperature scales is given by the equation K = C + 273, where K is the temperature in Kelvin and C is the temperature in Celsius. This means that the temperature difference of 1°C is equal to that of 1K.
Q: When two bodies at different temperatures are brought in contact with each other, what happens?
A.The hot body gets colder and the cold body gets hotter
B.The hot body gets hotter and the cold body gets colder
C.The hot body and the cold body remain at the same temperature
D.The hot body and the cold body exchange volumes
Correct Option: AExplanation:
There will be a transfer of heat energy from the hot body to the cold body until a thermal equilibrium is established between them.
Q: What is the definition of calorie?
A.The amount of heat energy required to rise the temperature of 1 gram of water through 1°C.
B.The amount of heat energy required to rise the temperature of 1 kilogram of water through 1°C.
C.The amount of heat energy required to boil 1 gram of water.
D.The amount of heat energy required to freeze 1 gram of water.
Correct Option: AExplanation:
A calorie is a unit of energy defined as the amount of heat energy required to raise the temperature of 1 gram of water by 1 degree Celsius.
Q: What is the process in which heat energy flows from a body at a higher temperature to another object at lower temperature known as?
A.Heating
B.Cooling
C.Convection
D.Radiation
Correct Option: BExplanation: The process in which heat energy flows from a body at a higher temperature to another object at lower temperature is known as heating.
Q: Heat energy is transferred from a body at higher temperature to another body at lower temperature. Is this statement true or false?
A.True
B.False
C.depends
D.may be
Correct Option: AExplanation:
Heat energy always flows from a system at higher temperature to a system at lower temperature.
Q: What is the definition of calorie?
A.The amount of heat energy required to rise the temperature of 1 gram of water through 1°C.
B.The amount of heat energy required to rise the temperature of 1 kilogram of water through 1°C.
C.The amount of heat energy required to boil 1 gram of water.
D.The amount of heat energy required to freeze 1 gram of water.
Correct Option: DExplanation:
A calorie is a unit of energy defined as the amount of heat energy required to raise the temperature of 1 gram of water by 1 degree Celsius.
Q: Which of the following factors affects the extent of thermal expansion in solids?
A.Mass of the object
B.Volume of the object
C.Nature of the object
D.Shape of the object
Correct Option: CExplanation:
The extent of thermal expansion in solids depends on the nature of the object, i.e., the type of material, crystal structure, and bonding between atoms.
Q: Which of the following is a characteristic feature of heat energy transfer?
A.Heat flows from a system at lower temperature to a system at higher temperature.
B.The mass of a system is altered when it is heated or cooled.
C.Heat gained by the cold system is not equal to heat lost by the hot system.
D.Heat gained by the cold system is equal to heat lost by the hot system.
Correct Option: DExplanation:
For any exchange of heat, the heat gained by the cold system is equal to heat lost by the hot system.Heat gained = Heat lost.
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