This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 3 Heat – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 3 Heat Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Maximum heat transfer rate could be achieved in ..... flow. A) Laminar. B) Counter-currrent. C) Co-current. D) None. Show Answer Correct Answer: B) Counter-currrent. 2. The enthalpy of dry saturated steam ..... with the increase in pressure A) Decreases. B) Increases. C) Remains constant. D) All of thr above. Show Answer Correct Answer: A) Decreases. 3. When ice melts its temperature A) Remains constant. B) Increases. C) Decreases. D) Cannot say. Show Answer Correct Answer: A) Remains constant. 4. What is the transfer of heat by direct contact? A) Radiation. B) Conduction. C) Convection. D) None of the above. Show Answer Correct Answer: B) Conduction. 5. Glass, steel, and aluminum are good examples of ..... A) Insulators. B) Thermal energy. C) Conductors. D) Radiation. Show Answer Correct Answer: C) Conductors. 6. Heat is a form of energy which flows from a ..... when they are kept in contact. A) Hot body to a cold body. B) Cold body to a hot body. C) Cold body to a cold body. D) Hot body to a hot body. Show Answer Correct Answer: A) Hot body to a cold body. 7. Increasing the temperature of a substance A) Increases its specific heat. B) Increases the potential energy. C) Increases the kinetic energy. D) Makes the molecules move more slowly. Show Answer Correct Answer: C) Increases the kinetic energy. 8. What would happen to the pressure of a gas which is heated at constant volume? A) Its pressure would remain same. B) Its pressure would increase. C) Its pressure would decrease. D) None of the above. Show Answer Correct Answer: B) Its pressure would increase. 9. Which is NOT a way heat is produced? A) Friction. B) Temperature. C) Mixing chemicals. D) Burning. Show Answer Correct Answer: B) Temperature. 10. If ..... if transferred from object A to object B, the temperature of object A decreases A) Cold. B) Heat. C) All the above. D) None of the above. Show Answer Correct Answer: B) Heat. 11. Why does an ice cube melt when dropped into hot liquid? A) The liquid absorbs heat from the ice. B) Heat from the liquid transfers to the ice. C) Heat from the ice transfers to the liquid. D) Cold from the ice transfers into the liquid. Show Answer Correct Answer: B) Heat from the liquid transfers to the ice. 12. How do you calculate $\Delta$T? A) T$_{initial}$-T$_{final}$. B) T$_{final }$-T$_{initial}$. C) T$_{initial }$-T$_{start}$. D) T$_{final}$-T $_{end}$. Show Answer Correct Answer: B) T$_{final }$-T$_{initial}$. 13. What happens when you rub your hands together? A) You create a conductor. B) You create a chemical reaction. C) You create a cool sound. D) You create friction. Show Answer Correct Answer: D) You create friction. 14. The type of heat transfer that occurs when heated air or water rises to the top of denser, cooler air or water. A) Conduction. B) Convection. C) Radiation. D) None of the above. Show Answer Correct Answer: B) Convection. 15. Energy= ..... to the speed of light squared A) Gravity. B) Sandwich. C) Mass. D) Lighting. Show Answer Correct Answer: C) Mass. 16. The temperature of a substance increases as ..... A) The substance expands. B) The average kinetic energy of its particles increases. C) The substance's volume increases. D) The substance's mass increases. Show Answer Correct Answer: B) The average kinetic energy of its particles increases. 17. Arnold wants to keep his hot cocoa warm as he travels to Ms. Frizzle's class. Which of the following items would be BEST at keeping his drink warm? A) Aluminum Foil. B) Paper Napkins. C) Styrofoam. D) Metal. Show Answer Correct Answer: C) Styrofoam. 18. Plastic is a ..... conductor of heat. A) Poor. B) Bad. C) All the above. D) None of the above. Show Answer Correct Answer: A) Poor. 19. What is the main mode of heat transfer in metals? A) Radiation. B) Convection. C) Conduction. D) Absorption. Show Answer Correct Answer: C) Conduction. 20. Which of the following expands only in volume when heated? A) Solid. B) Liquid. C) Gas. D) Both (b) and (c). Show Answer Correct Answer: C) Gas. 21. SI unit of heat A) Joule. B) Calories. C) Kelvin. D) Degrees. Show Answer Correct Answer: A) Joule. 22. The flow of thermal energy from warmer objects to cooler objects is called ..... A) Heat. B) Movement. C) Friction. D) Energy. Show Answer Correct Answer: A) Heat. 23. The change from liquid to solid is called ..... A) Melting. B) Freezing. C) Evaporation. D) Condensation. Show Answer Correct Answer: B) Freezing. 24. The liquid in the thermometer rises when it is placed in the hot water because ..... A) It gains heat from the hot water and expands. B) Loses heat from the hot water and contracts. C) The surrounding air is too warm. D) The liquid is boiling. Show Answer Correct Answer: A) It gains heat from the hot water and expands. 25. What kind of heat transfer occurs between two objects that are touching when the particles in those objects collide with each other? A) Conduction. B) Convection. C) Radiation. D) Reflection. Show Answer Correct Answer: A) Conduction. ← PreviousNext →Related QuizzesClass 7 Science Chapter 3 Heat Quiz 1Class 7 Science Chapter 3 Heat Quiz 2Class 7 Science Chapter 3 Heat Quiz 3Class 7 Science Chapter 3 Heat Quiz 5Class 7 Science Chapter 3 Heat Quiz 6Class 7 Science Chapter 3 Heat Quiz 7Class 7 Science Chapter 3 Heat Quiz 8Class 7 Science Chapter 3 Heat Quiz 9Class 7 Science Chapter 3 Heat Quiz 10Class 7 Science Chapter 3 Heat Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books