set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on inorganic chemistry topic of general science mcq
(a) Basic and acidic
(b) Acidic
(c) Basic
(d) Neutral
The correct answers to the above question in:
Answer: (a)
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Question : 1
Consider the following statements :
- Among the nitrogenous fertilizers used, urea contains maximum percentage of N.
- The mixture of calcium sulphate and calcium dihydrogen phosphate is known as superphosphate of lime.
- Potassium magnesium sulphate is called the muriate of potash.
a) 1 and 3
b) 2 and 3
c) 1 and 2
d) 1, 2 and 3
Answer »Answer: (c)
Statement (1) and (2) are correct. Urea contains maximum percentage of N among various fertilizers used. The mixture of Ca(H2PO4) 2 and CaSO4 is sold as “super phosphate”. Statement (3) is wrong. Muriate is name for potassium chloride KCl.
Question : 2
Food cans are coated with tin and not with zinc because
a) zinc is more reactive than tin
b) zinc has a higher melting point than tin
c) zinc is costlier than tin
d) zinc is less reactive than tin
Answer »Answer: (a)
Question : 3
While tinning of brass utensils, the ammonium chloride powder used to clean the hot utensil produces fumes of
a) hydrochloric acid
b) carbon monoxide
c) ammonia
d) ammonia and hydrochloric acid
Answer »Answer: (d)
It produces fumes of ammonia and hydrochloric acid.
Question : 4
Match List-I with List-II :
| List-I | List-II |
| A. German silver | 1. Tin |
| B. Solder | 2. Nickel |
| C. Bleaching powder | 3. Sodium |
| D. Hypo | 4. Chlorine |
a) 1 2 3 4
b) 2 1 3 4
c) 1 2 4 3
d) 2 1 4 3
Answer »Answer: (d)
Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc.
Solders are typically made from tin or lead or a combination of both in the ratio of 63:37 respectively.
Calcium hypochlorite, also known as bleaching powder, is a chemical compound with the formula Ca(ClO)2. It is widely used for water treatment and as a bleaching agent. This chemical is considered to be relatively stable and has greater available chlorine than sodium hypochlorite (liquid bleach).
Hypo solution is the abbreviation for sodium thiosulphate or sodium hyposulphite, a chemical used to fix the image on photographic film after it has been developed.
Question : 5
In the manufacture of lead glass:
- Oxide of lead is added to ordinary glass
- Oxide of lead increases the density of glass
- Oxide of lead increases the refractive index of glass
- Oxide of lead decreases the refractive index of glass
a) 1, 3 and 4
b) 2, 3 and 4
c) 1, 2 and 4
d) 1, 2 and 3
Answer »Answer: (d)
Question : 6
Match List-I with List-II and select the correct answer using the codes given below the lists:
| List-I | List-II |
| A. Limestone | 1. Cement |
| B. Copper | 2. Electrical goods |
| C. Bauxite | 3. Manufacture of aeroplanes |
| D. Manganese | 4. Steel |
a) 4 3 2 1
b) 2 3 1 4
c) 1 2 3 4
d) 3 4 1 2
Answer »Answer: (c)
Manganese is essential to iron and steel production. At present, steel making accounts for 85 to 90% of the total demand, most of the total demand. Manganese is a key component of low-cost stainless steel formulations and certain widely used aluminium alloys.
Limestone can be used in constructing buildings. It can be used for making cement and mortar. Limestone is used to make glass and even used to make roads.
Bauxite is the mineral ore of aluminium which is used in the manufacture of cans, aeroplanes, sporting and electronic equipment and home appliances.
The Wright Brother’s first aeroplane to fly in 1903 only was able to get off the ground because they modified its engine with aluminium in order to reduce its weight. Without the ability of the strong aluminium, alloys to withstand the huge pressures and stresses involved, high-altitude flying would not be conceivable. In fact, aluminium comprises about 80% of an aircraft’s unladen weight.
The element copper is used extensively as an electrical conductor, for the making of electrical wire.
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