19.Neft qanday holatdagi yonilg’i?
a)gaz b)suyuq d)qattiq
20.Tabiiy gaz qanday holatdagi yoqilg’i?
a) gaz b) suyuq d) qattiq
21.Toshko’mir qazib olinadigan yer osti joyi nima deb ataladi?_________________
22. Marmar nima uchun ishlatiladi? _______________________________________
23.Granit qayerlarda ishlatiladi? __________________________________________
24. Qum va gil nima uchun ishlatiladi? _____________________________________
25.Tejamkorlik deganda nimani tushunasiz? ________________________________
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