GENERAL SCIENCE #47
MULTIPLE CHOICE QUESTIONS
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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