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