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