Chemistry A balloon filled with helium rises in air because The balloon is weightless Helium pushes down on the air below the balloon Air exerts an upward force on the balloon Helium is less dense than air The balloon is weightless Helium pushes down on the air below the balloon Air exerts an upward force on the balloon Helium is less dense than air ANSWER DOWNLOAD EXAMIANS APP
Chemistry Mixture can be Pure substance Homogeneous Heterogeneous Both A and B Pure substance Homogeneous Heterogeneous Both A and B ANSWER DOWNLOAD EXAMIANS APP
Chemistry The term 'brown air' is used for Sulphurous smog Photochemical smog Acid fumes Industrial smog Sulphurous smog Photochemical smog Acid fumes Industrial smog ANSWER DOWNLOAD EXAMIANS APP
Chemistry The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind? 1/3 1/6 1/8 1/4 1/3 1/6 1/8 1/4 ANSWER DOWNLOAD EXAMIANS APP
Chemistry Carbon footprint can be reduced by Commuting by public transport All of these Using energy efficient appliances Recycling waste materials Commuting by public transport All of these Using energy efficient appliances Recycling waste materials ANSWER DOWNLOAD EXAMIANS APP
Chemistry The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called : Vulcanization Alloy formation Zinc plating Galvanization Vulcanization Alloy formation Zinc plating Galvanization ANSWER DOWNLOAD EXAMIANS APP
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