Question : The concentration of material which is lethal to 50% of animals is called:
Option 1: LD50
Option 2: LC50
Option 3: NO AEL
Option 4: ADI
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Correct Answer: LD50
Solution : The correct option is LD50.
LD50 is a measure of a substance's acute toxicity, defined as the amount of the substance that causes death in 50% of a group of test animals. Similarly, LC50 is the concentration of a chemical in air or water that will kill 50% of test animals in a single exposure.
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Question : The chemical formula of washing soda is
Option 1: Na2So4 .10H2O
Option 2: NaHCO3
Option 3: Na2CO3.10H2O
Option 4: Ca(OH)2
Question : The chemical formula of acetic acid is
Option 1: CH3COH
Option 2: CH3COOH
Option 3: CH3COCH3
Option 4: CH2COOH
Question : Stalactites and Stalagmites form due to the precipitation of:
Option 1: CaCO3
Option 2: CaCl2
Option 3: MgCl2
Option 4: MgCO3
Question : Which of the following metal salts is responsible for permanent hardness in water?
Option 1: KCl
Option 2: Nacl
Option 3: Ca(HCO3)2
Option 4: CaCl2
Question : Types of vertebrate animals which creep and crawl are called:
Option 1: Mammalians
Option 2: Amphibians
Option 3: Mollusks
Option 4: Reptilians
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