Grade 12 work sheet

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    A.The rate at which a blackbody absorbs radiation is proportional to its temperature.     B.The total energy radiated by a blackbody is proportional to the fourth power of its temperature.     C.The rate at which a blackbody emits radiation is inversely proportional to its surface area.     D.The energy radiated by a blackbody is independent of its temperature. Join us 👇👇 @worksheet11 @worksheet11

👋 students how are you here are 20 multiple choice questions related to thermal conductivity, Stefan-Boltzmann law, and Newton's law of cooling: TRY BY YOUR SELF AND WRITE YOUR ANSWER IN THE COMMENT BOX. GOOD LUCK! 1. Which of the following properties describes the ability of a material to conduct heat?    A. Thermal resistance    B. Thermal conductivity    C. Specific heat capacity    D. Thermal diffusivity 2. The unit of thermal conductivity is:    A. Watts per square meter (W/m^2)    B. Watts per meter per kelvin (W/mK)    C. Joules per second (J/s)    D. Kelvin per watt (K/W) 3. Stefan-Boltzmann law describes the relationship between:    A. Heat transfer and temperature difference    B. Thermal conductivity and temperature    C. Blackbody radiation and temperature    D. Specific heat capacity and energy transfer 4. According to Stefan-Boltzmann law, the total energy radiated by a blackbody is proportional to the:    A. Fourth power of its temperature    B. Square of its temperature    C. Cube of its temperature    D. Inverse of its temperature 5. Newton's law of cooling describes the rate at which:    A. Heat is transferred through conduction    B. Heat is transferred through radiation    C. Temperature changes in a material    D. An object cools due to convection 6. Newton's law of cooling states that the rate of heat loss from an object is proportional to the:    A. Temperature difference between the object and its surroundings    B. Surface area of the object    C. Mass of the object    D. Specific heat capacity of the object 7. Which of the following materials has the highest thermal conductivity?    A. Wood    B. Copper    C. Plastic    D. Glass 8. The thermal conductivity of a material depends on its:    A. Density    B. Composition    C. Structure    D. All of the above 9. Which law describes the relationship between the rate of heat transfer and the temperature difference between two objects?    A. Stefan-Boltzmann law    B. Newton's law of cooling    C. Fourier's law    D. Ohm's law 10. The thermal conductivity of a material is a measure of its ability to:     A. Absorb heat     B. Reflect heat     C. Conduct heat     D. Emit heat 11. The Stefan-Boltzmann constant is denoted by the symbol:     A. σ (sigma)     B. λ (lambda)     C. α (alpha)     D. β (beta) 12. The Stefan-Boltzmann constant has a value of approximately:     A. 5.67 x 10^-8 W/m^2K^4     B. 9.81 m/s^2     C. 3 x 10^8 m/s     D. 1.6 x 10^-19 coulombs 13. Which of the following statements is true about thermal conductivity?     A. Higher thermal conductivity means slower heat transfer.     B. Thermal conductivity is a vector quantity.     C. Materials with high thermal conductivity are good insulators.     D. Thermal conductivity depends on temperature. 14. The rate at which an object cools down can be calculated using:     A. Fourier's law     B. Ohm's law     C. Newton's law of cooling     D. Boyle's law 15. Which statement best describes Newton's law of cooling?     A. The rate of heat loss from an object is proportional to its temperature.     B. The rate of heat gain by an object is proportional to its surface area.     C. The rate of temperature change in an object is proportional to its mass.     D. The rate of energy transfer in an object is inversely proportional to its specific heat capacity. 16.The rate at which an object radiates energy is given by:     A.Stefan-Boltzmann law     B.Newton's law of cooling     C.Fourier's law     D.Ohm's law 17.Which factor does not affect the rate of heat transfer through conduction?     A.Temperature difference between two points     B.Thickness of the material     C.Surface area of the material     D.Thermal conductivity of the material 18.Which statement best describes Stefan-Boltzmann law?

Top physics exam book for grade 11 and 12 from 2004-2010 EUEE Questions and answers with detail explanations‼️ @worksheet11 @worksheet11

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Question (gr 12 unit 1) 🔴#1 Degenerative diseases are A. types of infectious diseases. B. Caused as aresult of person’s working condition C. Caused as a result of ageing D. Caused by lack of nutrients in our diet. 🔴#2  Which one of the following is a genetic disease? A. Fibrosis B. Haemophilia C. Scurvy D. Heart disease 🔴#3 From which one of the following was the first antibiotics produced? A.  bacteria B. Virus C. Protozoa D. None 🔴#4 The period when the body keeps replacing the T-cells as fast as they are destroyed by HIV is called  A. latency period B. incubation period C. window period    D. None ✅Answer __? ♻️Join us👇👇👇👇 @worksheet11 @worksheet11