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MCQs

Total Questions : 137 | Page 4 of 14 pages
Question 31. In a day call (battery) which of the following is used as Electrolytes?
  1.    Ammonium chloride and zinc chloride
  2.    Sodium chloride and calcium chloride
  3.    Magnesium chloride and zinc chloride
  4.    Ammonium chloride and calcium chloride
 Discuss Question
Answer: Option A. -> Ammonium chloride and zinc chloride
:
A
Option: (a)
Question 32. Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
  1.    Aluminium
  2.    Chromium
  3.    Nickel
  4.    Tungsten
 Discuss Question
Answer: Option B. -> Chromium
:
B
Option: (b)
Question 33. Physico-chemical characteristics of water in water sources undergo changes due to
  1.    aquatic macrophytes
  2.    aquatic fungi
  3.    effluents
  4.    evapo-transpiration
 Discuss Question
Answer: Option C. -> effluents
:
C
Option:(c)
Question 34. An atom has 17 electrons, 17 protons, 18 neutrons. Therefore which of the following is/are true?
(a) Its atomic number is 17
(b) Its mass number is 35
  1.    Only (a)
  2.    Only (b)
  3.    (a) and (b)
  4.    Neither (a) nor (b)
 Discuss Question
Answer: Option C. -> (a) and (b)
:
C
Option: (c)
Question 35. Consider the following statements
(a) Baking soda is used in fire extinguishers
(b) Quicklime is used in the manufacture of glass
(c) Gypsum is used in the manufacture of Plaster of Paris
Which of the statements given above is/are correct?
  1.    (a) and (b)
  2.    (b) and (c)
  3.    (a) only
  4.    (a), (b) and (c)
 Discuss Question
Answer: Option D. -> (a), (b) and (c)
:
D
Option:(d)
Question 36. Match List I with List II and select the correct answer using the codes given below the lists.
List I                              List II
A. German silver       1. Tin
B. Solder                     2. Nickel
C. Bleaching powder3. Sodium
D. Hypo                      4. Chlorine
  1.    1    2    4    3
  2.    2    1    3   4
  3.    1    2    3   4
  4.    2    1   4   3
 Discuss Question
Answer: Option D. -> 2    1   4   3
:
D
Option:(d)
Question 37. Mixture of which one of the following pairs of gases is the cause of occurrence of most of the explosions in mines?
  1.    Hydrogen and oxygen
  2.    Oxygen and acetylene
  3.    Methane and air
  4.    Carbon dioxide and methane
 Discuss Question
Answer: Option C. -> Methane and air
:
C
Option:(c)
Question 38. Hard water is water that has high mineral content. Consider the following statements Hard water is not suitable for
(a) drinking
(b) washing clothes with soap
(c) use in boilers
(d) irrigating crops
Which of these statements are correct?
  1.    (a) and (c)
  2.    (b) and (c)
  3.    (a), (b) and (d)
  4.    (a), (b), (c) and (d)
 Discuss Question
Answer: Option B. -> (b) and (c)
:
B
Option:(b)
Question 39. An aqueous solution of copper sulphate is acidic in nature because the salt undergoes
  1.    Dialysis
  2.    electrolysis
  3.    hydrolysis
  4.    photolysis
 Discuss Question
Answer: Option C. -> hydrolysis
:
C
Option: (c)
Question 40. What are Rubies and Sapphires chemically known as?
  1.    Silicon dioxide
  2.    Aluminium oxide
  3.    Lead tetroxide
  4.    Boron nitride
 Discuss Question
Answer: Option B. -> Aluminium oxide
:
B
Option:(b)

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