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WBJEE: Important Questions and Preparation Tips – Thermal properties of matter

Dec 6, 2017 14:50 IST
    UPSEE/UPTU 2018: Thermal properties of matter
    UPSEE/UPTU 2018: Thermal properties of matter

    The number of engineering aspirants is increasing day by day. All aspirants want to select in top colleges after clearing national level engineering entrance exam Joint Entrance Examination (JEE), but it is not possible as the number of seats is very few. All engineering aspirants can also appear for WBJEE Entrance examination which is easier as compared to JEE.

    In this article, we bring to you chapter notes of chapter Thermal properties of matter which will help you in your preparation for coming WBJEE examination.

    About the notes:

    These chapter notes contain all important topics related to Thermal properties of matter like ideal gas equation, thermal expansion (linear, area and volume), heat capacity, specific heat capacity, calorimeter, fusion, normal boiling point, sublimation, three modes of heat transfer (conduction, convection, radiation), Newton’s law of cooling etc.

    These notes are prepared by Subject Experts of Physics after observing the pattern and the difficulty level of last few year papers of the examination.

    These notes can be used for quick revision when only few days are left before the WBJEE examination.

    About the Exam:

    West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

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    Important Concepts:

    WBJEE Thermal Properties of Matter

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    Some previous years solved questions are given below:

    Question 1:

    In which of the following phenomena, the heat waves travel along straight lines with the speed of light ?

    (A) thermal conduction

    (B) forced convection

    (C) natural convection

    (D) thermal radiation

    Solution 1:

    In thermal radiation, the heat waves travel along straight lines with the speed of light.

    Hence, the correct option is (A).

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    Question 2:

    Consider a blackbody radiation in a cubical box at absolute temperature T. If the length of each side of the box is doubled and the temperature of the walls of the box and that of the radiation is halved, then the total energy

    (A) halves

    (B) doubles

    (C) quadruples

    (D) remains the same

    Solution 2:

    Assuming temperature of the body and cubical box is same initially i.e. T and finally it becomes T/2. Because temperature of body and surrounding remains same Hence, there is

    no net loss of radiation through the body. Thus total energy remains constant.

    Hence, the correct option is (A).

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    Question 3:

    A solid maintained at t1 C is kept in an evacuated chamber at temperature t2 C (t2 >> t1). The rate of heat absorbed by the body is proportional to

    WBJEE Thermal Q3

    Solution 3:

    Since the temperature are given in Celsius, so none of the options are correct.

    The rate of heat absorbed will be proportional to (t2 + 273)4 – (t1 + 273)4.

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    Question 4:

    If the temperature of the Sun gets doubled, the rate of energy received on the Earth will increase by a factor of

    (A) 2

    (B) 4

    (C) 8

    (D) 16

    Solution 4:

    WBJEE Thermal properties of matter

    Hence, the correct option is (D).

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    WBJEE 2018: Notification, Application, Dates, Eligibility, Exam Pattern, Syllabus

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