Here we have provided assertion and reason questions for class 11 physics chapter 11 Thermal Properties of Matter. These questions are prepared by subject experts. Students can use these questions for practice.
Assertion and Reason Questions for Class 11 Physics Chapter 11 Thermal Properties of Matter
Directions: Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
Q.1. Assertion : Specific heat capacity is the cause of formation of land and sea breeze.
Reason : The specific heat of water is more than land.
Q.2. Assertion : A brass disc is just fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole.
Reason : The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel.
Q.3. Assertion : The coefficient of volume expansion has dimension K–1.
Reason : The coefficient of volume expansion is defined as the change in volume per unit volume per unit change in temperature.
Q.4. Assertion : The temperature at which Centigrade and Fahrenheit thermometers read the same is – 40°.
Reason : There is no relation between Fahrenheit and Centigrade temperature.
Q.5. Assertion : The melting point of ice decreases with increase of pressure.
Reason : Ice contracts on melting.
AnswerAnswer: (a) With rise in pressure melting point of ice decreases. Also ice contracts on melting
Q.6. Assertion : When a solid iron ball is heated, percentage increase is its volume is largest.
Reason : Coefficient of superficial expansion is twice that of linear expansion where as coefficient of volume expansion is three time of linear expansion.
Q.7. Assertion : A beaker is completely filled with water at 4°C. It will overflow, both when heated or cooled.
Reason : There is expansion of water below and above 4°C.
Q.8. Assertion : Latent heat of fusion of ice is 336000 J kg–1.
Reason : Latent heat refers to change of state without any change in temperature
Q.9. Assertion : Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature.
Reason : The two bodies may have different thermal capacities.
Q.10. Assertion : Specific heat of a body is always greater than its thermal capacity.
Reason : Thermal capacity is the required for raising temperature of unit mass of the body through unit degree.
Q.11. Assertion : Water kept in an open vessel will quickly evaporate on the surface of the moon.
Reason : The temperature at the surface of the moon is much higher than boiling point of the water.
Q.12. Assertion : Fahrenheit is the smallest unit measuring temperature.
Reason : Fahrenheit was the first temperature scale used for measuring temperature.
Q.13. Assertion : The molecules at 0ºC ice and 0ºC water will have same potential energy.
Reason : Potential energy depends only on temperature of the system.