21.Qaysi blok kuchdan ikki marta yutuq beradi?
A) ko’char B) ko’chmas S) lebyodka D) qiya tekislik
22.Issiqlik o’tkazuvchanligi turlicha bo’lgan bir-biriga parchinlanib mahkamlangan ikkita metall plastinaga nima deb ataladi?
A) dimetal plastina B) bimetal plastina S) trimetal plastina D) pimetal plastina
23.Normal atmosfera bosimida qaynayotgan toza suv temperaturasi necha gradus deb qabul qilingan?
A) 00C B) 40C S) 1000C D) 270C
24.Sog’lom odamning tana temperaturasi necha gradus bo’ladi?
A) 420C B) 1000C S) 00C D) 36,60C
25.Fransuz olimi Sh.Dyufe va amerikalik olim … taklifiga binoan birinchi turdagi zaryadni shartli ravishda musbat zaryad deb, ikkinchi turdagi zaryadni shartli ravishda manfiy zaryad deb atashga kelishilgan?
A) I.Nyuton B) B.Franklin S).G.Galiley D) Arximed
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