Science Practice Quiz 162

Q1.In which year was the Celsius scale devised by Anders Celsius?

A. 1742 B. 1642 C. 1842 D. 1942

Q2.What happened to the initial fixed points of the Celsius scale (boiling water at 0°C and freezing water at 100°C) very soon after its invention?

A. The order was reversed B. The scale was abandoned C. The scale was renamed D. The fixed points were doubled

Q3.What is the characteristic taste of substances that contain acids?

A. Sweet B. Salty C. Bitter D. Sour

Q4.The word 'acid' is derived from which Latin word?

A. 'amarus' B. 'dulcis' C. 'salsus' D. 'acere'

Q5.Which of the following substances is described as bitter in taste and feels soapy on touching?

A. Lemon juice B. Vinegar C. Baking soda D. Orange juice

Q6.Substances that are bitter in taste and feel soapy on touching are generally known as what?

A. Acids B. Salts C. Indicators D. Bases

Q7.What are the special substances used to test whether a substance is acidic or basic, which change their colour when added to a solution?

A. Solvents B. Catalysts C. Indicators D. Reactants

Q8.Which of the following is a naturally occurring indicator mentioned in the text?

A. Phenolphthalein B. Methyl orange C. Litmus D. Universal indicator

Q9.Which of these substances tastes sour because it contains acids?

A. Common salt B. Sugar C. Baking soda D. Curd

Q10.From which organism is litmus, a commonly used natural indicator, extracted?

A. Algae B. Fungi C. Lichens D. Mosses