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