Thermal Properties of Matter - Online Test
Q1. In which mode of heat transfer no medium is required?
Answer : Option D
Explaination / Solution:
Heat transfer through radiation takes place in form of electromagnetic waves.
Q2. In which mode of heat transfer is there material movement?
Answer : Option D
Explaination / Solution:
Convection is the heat transfer due to bulk movement of molecules within fluids.
Q3. if k is the thermal conductivity of the material of the bar of cross section A whose ends are maintained at temperatures and , the rate of flow of heat H is :
Answer : Option D
Explaination / Solution:
rate of flow of heat H depends on
hence
K = thermal conductivity of the material
Q4. If is the temperature of the surrounding medium and is the temperature of the body, then according to Newton’s Law of Cooling rate of cooling of the body is
Answer : Option B
Explaination / Solution:
Newton's law of cooling states that the rate of heat loss of a body is directly proportional to the difference in the temperatures between the body and its surroundings.
Q5. The average kinetic energy of the molecules in a substance is most closely associated with
Answer : Option D
Explaination / Solution:
E=32kT
Q6. The Celsius temperature at absolute zero is equal to
Answer : Option B
Explaination / Solution:
TC−0100−0=TK−273.15373.15−273.15
Q7. Which of the following is true of the Celsius and Kelvin temperature scales?
Answer : Option D
Explaination / Solution:
A Kelvin degree and a Celsius degree means change in temperature.
Q8. In general, when a solid is heated, it
Answer : Option B
Explaination / Solution:
Δl=βVΔTΔA=αVΔTΔV=γVΔT
Q9. A brass spring has a spring constant k. When the spring is heated, the spring constant will
Answer : Option C
Explaination / Solution:
on heating spring will be expand
Q10. Which of the following statement(s) is/are true?
(I) Every substance contains heat.
(II) For heat to flow between two substances, they must be at different temperatures.
(III) The internal energy of a substance is equal to the kinetic energy of the molecules in the substance.
Answer : Option B
Explaination / Solution:
Heat is the form of energy that is transferred from one body to another as the result of a difference in temperature
