Welcome to your Thermal/Heat Energy (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. A school boy riding a bicycle is converting Mechanical to kinetic energies Electrical to mechanical to kinetic energies None of the above Chemical to mechanical to kinetic energies 2. The sprinkling of water reduces slightly the temperature of a closed room because of ______ Water has large latent heat of vaporisation Water is a bad conductor of heat Temperature of water is less than that of the room Specific heat of water is high 3. Which of the following is more close to a black body? Blackboard paint Black holes Red roses Green leaves 4. What is the ability to perform work called? Energy Power Determination Force 5. A pressure cooker reduces cooking time for food, because _______ Heat is more evenly distributed in the cooking space Cooking involves chemical changes helped by a rise in temperature The higher pressure inside the cooker crushes the food material Boiling point of water involved in cooking is increased 6. The heat from a fire at one end of a closed room reaches some one at the other end of the room mainly by conduction reflection diffusion radiation 7. Heat flow into a system is taken to be ____, and heat flow out of the system is taken as ____ positive, positive negative, positive negative, negative positive, negative 8. Which of the following is a stored energy in an accumulator battery cell? Heat Sound None of the above Light Electrical 9. The energy conversions in a hydroelectric power supply is none of the above heat → kinetic → mechanical → electrical potential → kinetic → mechanical → electrical sound → kinetic → mechanical → electrical 10. Which of the following is a type of energy? low grade energy both of the mentioned high grade energy none of the mentioned 11. The sound wave moves faster in air solid alcohol vacuum water 12. Ratio of the amount of heat radiation, transmitted through the body to the amount of heat radiation incident on it, is known as _________ Absorbance Transmittance Inductance Conductance 13. The transfer of heat between a wall and a fluid system in motion is called none of the mentioned radiation conduction convection 14. How much is the average temperature at depth of 10 km of earth surface? 20°C 650°C 900°C 200°C 15. Woollen clothes keep the body warm because of wool ___________ Decreases the temperature Increases the temperature of body Has no effect Is a bad conductor 16. If you rub your palms together for some time, you feel warm. The action amounts to converting potential → chemical → heat energy potential → kinetic → heat energy solar → chemical → mechanical → heat energy chemical → potential → heat energy 17. In a vacuum, heat can travel by: radiation only radiation and convection conduction only convection only 18. Which of the statements is NOT true? convection process requires a material medium none of the above conduction is the only means of heat transfer in solids convection can take place in liquids and gases 19. What type of energy is contained in the battery of a torch light? Mechanical Light Heat Chemical 20. Which of the following is not a form of energy? Heat Speed Light Sound 1 out of 20 Time is Up! Time's up