General Science #47 Multiple Choice Questions (MCQ) : Assam Jobs Guide

GENERAL SCIENCE #47

MULTIPLE CHOICE QUESTIONS

General Science : Multiple Choice Questions (MCQ) : Assam Jobs Guide

1. An oxide is acidic and has a pungent odour. It could be ……………

(a) sulphur dioxide

(b) carbon dioxide

(c) sodium oxide

(d) nitrogen dioxide

Answer: (d)

2. Out of these gases which one is used in fire extinguishers?

(a) CO2

(b) SO2

(c) NO2

(d) H2S

Answer: (a)

3. The correct way of making a solution of acid in water is to ……………

(a) add water to acid

(b) add acid to water

(c) mix acid and water simultaneously

(d) add water to acid in a shallow container

Answer: (b)

4. Products of a neutralisation reaction are always ……………

(a) an acid and a base

(b) an acid and a salt

(c) a salt and water

(d) a salt and a base

Answer: (c)

5. Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed?

(a) Yellow in both acid and base

(b) Yellow in acid and red in base

(c) Pink in acid and yellow in base

(d) Red in acid and blue in base

Answer: (b)

6. Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are ……………

(a) red and blue

(b) blue and red

(c) pink and colourless

(d) colourless and pink

Answer: (d)

7. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

(a) Organic matter

(b) Quick lime

(c) Slaked lime

(d) Calamine solution

Answer: (a)

8. Which of the following set of substances contain acids?

(a) Grapes, lime water

(b) Vinegar, soap

(c) Curd, milk of magnesia

(d) Curd, vinegar

Answer: (d)

9. On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?

(a) Basic

(b) Either acidic or basic

(c) Either acidic or neutral

(d) Either basic or neutral

Answer: (c)

10. Which of the following is an acid-base indicator?

(a) Vinegar

(b) Lime water

(c) Turmeric

(d) Baking soda

Answer: (c)

11. Acids taste …………

(a) sour

(b) sweet

(c) bitter

(d) salty

Answer: (a)

12. Bases taste …………

(a) sweet

(b) sour

(c) bitter

(d) salty

Answer: (c)

13. The nature of bases is …………

(a) acidic

(b) basic

(c) neutral

(d) All of the above

Answer: (b)

14. Which of the following feel soapy on touching?

(a) Acid

(b) Base

(c) Salt

(d) None of the above

Answer: (b)

15. Which of the following is a natural indicator?

(a) China rose petal

(b) Turmeric

(c) Litmus

(d) All of the above

Answer: (d)

16. Which is the most commonly used natural indicator?

(a) Turmeric

(b) Beetroot

(c) China rose petal

(d) Litmus

Answer: (d)

17. Which of the following is basic in nature?

(a) Lime water

(b) Baking soda

(c) Both ‘a’ and ‘b’

(d) Lemon juice

Answer: (c)

18. Litmus is extracted from which of the following?

(a) Curd

(b) Grapes

(c) Lichens

(d) Cabbage

Answer: (c)

19. Calcium hydroxide is found in which of the following?

(a) Window cleaner

(b) Lime water

(c) Soap

(d) Lime juice

Answer: (b)

20. Neutralisation reaction is a ……………

(a) physical and reversible change

(b) physical and irreversible change

(c) chemical and reversible change

(d) chemical and irreversible change

Answer: (d)

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