Chemistry A balloon filled with helium rises in air because Helium is less dense than air Helium pushes down on the air below the balloon The balloon is weightless Air exerts an upward force on the balloon Helium is less dense than air Helium pushes down on the air below the balloon The balloon is weightless Air exerts an upward force on the balloon ANSWER DOWNLOAD EXAMIANS APP
Chemistry The first metal used by man was bronze iron gold copper bronze iron gold copper ANSWER DOWNLOAD EXAMIANS APP
Chemistry Mercury is emitted into air by Burning coal Steam engine Coal fire Burning garbage Burning coal Steam engine Coal fire Burning garbage ANSWER DOWNLOAD EXAMIANS APP
Chemistry Bauxite is an alloy of which of the following metals ? Tin Aluminium Iron Silver Tin Aluminium Iron Silver ANSWER DOWNLOAD EXAMIANS APP
Chemistry The gas which turns into liquid at the lowest temperature among the following is Oxygen Helium Nitrogen Hydrogen Oxygen Helium Nitrogen Hydrogen ANSWER DOWNLOAD EXAMIANS APP
Chemistry The buffer action of blood is due to the presence of CI– and [CO3]2– HCI and NaCI [HCO3]– and H2CO3 CI– and [HCO3]– CI– and [CO3]2– HCI and NaCI [HCO3]– and H2CO3 CI– and [HCO3]– ANSWER DOWNLOAD EXAMIANS APP
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