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