Ncert – class 8- science – Chapter 3: Coal and Petroleum 2 Welcome to your Ncert - class 8- science - Chapter 3: Coal and Petroleum 2 1. What is the source of fly ash Coal Petroleum All of the above Natural gas None 2. Coal is obtained by: none of above decomposition of dead aquatic animals carbonization refining None 3. Assertion: Fuel oil is better than coal for use in industries.Reason: It has a high calorific value than coal and does not leave smoke or ash on burning. Assertion is true and Reason is false Both Assertion and Reason are true. Reason is the correct explanation of Assertion. Both Assertion and Reason are false. Both Assertion and Reason are true. Reason is not the correct explanation of Assertion. None 4. Which of the following properties is NOT a characteristic of a good fuel? Low cost Causes minimum pollution High ignition temperature Readily available None 5. Which of these resources are in the danger of getting depleted with use? None Petroleum Both Coal and Petroleum Coal None 6. ............. is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system. None of these Coal gas Coke Coal tar None 7. A petroleum fraction having boiling range 70−200 ∘C and containing 6−10 carbon atoms per molecule is called: gasoline natural gas kerosene gas oil None 8. ________ is among the by-products when coal is carbonized to make coke. Carbon dioxide All of above Coal tar Coal None 9. Coking coal is coal which on carbonisation goes through: resolidification softening swelling. All of the above. None 10. Coal tar belongs to a class of drugs known as: alcohols, none of above aldehydes keratoplastics None 11. ______ has the highest carbon purity and is used to manufacture energy. Petrol coke Both A and B Calcinated pet coke None of the above None 12. Study the characteristics given below: (i) It is a tough, porous and black substance. (ii) It is a pure form of carbon. Based on the above characteristics, identify it from the following. Kerosene Coke Lubricating oil Petrol None 13. Why is foundry coke used in boilers and furnaces? Excellent source of heat None of above Excellent source of light Excellent insulator None 14. Which of these is not a physical property of coke? None of above Porous Tough White None 15. Which of these is the main constituent of petroleum gas? Ethane Propane Butane Methane None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
