16/12/2019 Thermal/Heat Energy (STUDY BY TOPICS JUNIOR CLASS) 16/12/2019 0Comments by Gate Academy Welcome to your Thermal/Heat Energy (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. Woollen clothes keep the body warm because of wool ___________ Has no effect Is a bad conductor Increases the temperature of body Decreases the temperature 2. Heat and work are all of the mentioned depend upon the path followed path functions inexact differentials 3. If you rub your palms together for some time, you feel warm. The action amounts to converting solar → chemical → mechanical → heat energy chemical → potential → heat energy potential → kinetic → heat energy potential → chemical → heat energy 4. A device which produces electricity with the aid of heat is called Thermocouple Windmill Thermostat Thermometer 5. Which of the following groups is all insulators rubber, copper, iron graphite, paper, rubber glass, plastic, paper iron, plastic, glass 6. Which of the following represents the energy in storage? internal energy none of the mentioned work heat 7. The transfer of heat between two bodies in direct contact is called radiation convection none of the mentioned conduction 8. Which of the following is the correct expression for Ohms law? V = R/ I R = I/ V I = V * R R = V/ I 9. Which of the following is true? latent heat of vaporization is highly sensitive to pressure both of the mentioned latent heat of fusion is not much affected by pressure none of the mentioned 10. On a cold morning, a metal surface will feel colder to touch than a wooden surface, because of ___________ Metal has high specific heat Metal has low thermal conductivity Metal has low specific heat Metal has high thermal conductivity 11. Electricity or electric current is the flow of energy in a wire flow of electrons in a wire energy supplied to a wire movement of atoms through a wire 12. What type of energy is contained in a body at rest? Kinetic Heat Electrical Potential 13. When a torch is used to light up a dark room what energy conversions are likely to take place? Chemical to light Electrical to heat Electrical to chemical Electrical to light 14. A swinging pendulum converts potential energy to Heat Electrical Kinetic Chemical 15. The sprinkling of water reduces slightly the temperature of a closed room because of ______ Temperature of water is less than that of the room Specific heat of water is high Water is a bad conductor of heat Water has large latent heat of vaporisation 16. The energy conversions in a hydroelectric power supply is potential → kinetic → mechanical → electrical none of the above sound → kinetic → mechanical → electrical heat → kinetic → mechanical → electrical 17. Ratio of the amount of heat radiation, transmitted through the body to the amount of heat radiation incident on it, is known as _________ Transmittance Absorbance Conductance Inductance 18. Energy stored in foods and fuels is called sound energy electrical energy heat energy light energy chemical energy 19. At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block and wood are ___________ Has no change Equal to the temperature of the body Less than the temperature of the body Greater than the temperature of the body 20. How much is the average temperature at depth of 10 km of earth surface? 650°C 20°C 900°C 200°C 1 out of 20 Time is Up! Time's up
