Al-Huda Science Academy has designed Physics Chapter 9 Class 9 MCQs for board preparation. Most of the questions are from the previous board papers. These are helping material for all type of students. Must share to your fellows if helpful.
Time allocated to each question is 20 seconds.
Physics Chapter 9 Class 9 MCQs
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#1. The thermal conductivity of dry air is _____ W/mK.#2. Rate of flow of heat through conductor is inversely proportional to its:#3. The thermal conductivity of dry air is _____ W/mK.#4. Rooms are heated using gas heaters by:#5. In solids, heat is transferred by:
#6. Poor conductor of heat is:#7. Worst absorber of heat is:#8. Global warming is due to a gas:#9. What happens to the thermal conductivity of a wall if its thickness is doubled?#10. The unit of rate of conduction of thermal energy is:
#11. The glider remains in air due to:#12. Thermal conductivity of brick is:#13. Radiation is the mode of transfer of heat from one place to another in the form of waves called:#14. Thermal conductivity of ice is:#15. Land breeze and sea breeze are the result of:
#16. Thermal conductivity of water is:#17. Which of the following is a good radiator of heat?#18. Convection of heat is the process of heat transfer due to the:#19. _____ is a good radiator of heat.#20. Unit of rate of thermal energy is:
#21. Warms clothes for winter season are:#22. In liquids, heat is mainly transferred by:#23. The surfaces of Leslie’s cube are:#24. Land breeze blows from#25. Which colour is a good absorber?
#26. The rate of flow of heat is:#27. In gases, heat is transferred by:#28. Which surface is bad emitter?#29. The example of bad conductor is:#30. Which of the following birds are expert thermal climbers?
#31. False ceiling is done to:#32. Metals are good good conductors of heat due to:#33. The thermal conductivity of copper in watt per meter per kelvin is:#34. The unit of thermal conductivity is:
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