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Science Practice Quiz 163
10 questions · 12 minutes
12:00
Q1.What color does litmus turn when it is added to an acidic solution?
Explanation: According to the text, 'When added to an acidic solution, it turns red and when added to a basic solution, it turns blue.'
Q2.What is the original color of litmus in distilled water?
Explanation: It has a mauve (purple) colour in distilled water.
Q3.Lactic acid is naturally found in which of the following substances?
Explanation: The table 'Name of acid Found in' lists 'Lactic acid Curd'.
Q4.Which of the following acids is found in ant's sting?
Explanation: The table 'Name of acid Found in' specifies 'Formic acid Ant’s sting'.
Q5.Calcium hydroxide is a base found in which of the following?
Explanation: The table 'Name of base Found in' indicates 'Calcium hydroxide Lime water'.
Q6.Which of these bases is a primary component of soap?
Explanation: Sodium hydroxide/Potassium hydroxide' as found in 'Soap.
Q7.Which of the following is explicitly mentioned as a natural indicator in the provided text?
Explanation: Turmeric is another natural indicator.
Q8.What characteristic defines 'neutral solutions'?
Explanation: The text defines neutral solutions as 'The solutions which do not change the colour of either red or blue litmus'.
Q9.How is turmeric paper prepared, as described in Activity 4.2?
Explanation: The text instructs, 'Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it.'
Q10.To prepare limewater, as per the instructions in the text, what substance is added to water?
Explanation: To prepare limewater, take some water in a tumbler and add some lime (chuna) into it.
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