Mock Test-2 (Paper-1) (Question 51-100)

Total Questions: 50

31. Chalk and marble are different from of

Correct Answer: (a) Calcium hydrogen carbonate
Solution:Chalk and marbles are different forms of Calcium carbonate. Chemical formula of both Marble and Chalk is CaCO3. Marble is metamorphosed limestone; Chalk is also a form of limestone consists of soft, porous rocks.

32. "Radioactive dating" is a technique which can be used to measure

Correct Answer: (a) the age of rocks
Solution:Radioactive dating is a technique which can be used to measure the age of rocks etc. In this process the half age of radio active is measured and on the basis of the quantity remaining after half the age of the rock, wood etc. is measured.

33. Commercial vulcanisation of rubber involves

Correct Answer: (a) sulphur
Solution:Vulcanisation is a process in which natural rubber is treated with 3-5% sulphur. It introduces sulphur bridges between polymer chains thereby increasing its tensile strength, elasticity and resistance to abrasion.

34. German silver is used to make decorative articles, coinage metal, ornaments, The name is given because :

Correct Answer: (c) Its appearance is like silver
Solution:German silver is a mixture of copper, zinc and nickel. It is an alloy metal. It is used to make pots and toys due to hardness toughness and resistance to corrosion.

35. The alkali metals have relatively low melting point. Which one of the following alkali metals is expected to have the highest melting point?

Correct Answer: (a) Li
Solution:Li is the alkali metal which has highest melting point.

36. Which one of the following glasses is used in bullet proof screens?

Correct Answer: (d) Reinforced glass
Solution:Reinforced glass is used in bullet proof covers.

37. Match List-I with List-II and select the correct answer from the codes given below:

List-I List-II 
A. German silver1. Tin
B. Solder2. Nickel
C. Bleaching powder3. Sodium
D. Hypo4. Chlorine

 

Code:ABCD
(a)1243
(b)2134
(c)1234
(d)2143

 

Correct Answer: (d)
Solution:German silver has a color resembling silver, but is an alloy of primarily copper, nickel and zinc.

Solder is an alloy of tin, antimony, copper and lead. Bleaching powder contains calcium chloride and calcium hypochlorite, used in solution as a bleach.

Bleaching powder is sold on the basis of available chlorine, which is liberated when it is treated with a dilute acid. It is used for bleaching paper pulps and fabrics and for sterilizing water.

38. Match List-I with List-II and select the correct answer from the codes given below:

List-I List-II 
A. Testosterone1. Sedative drug
B. Codeine2. Indian rubber
C. Caoutchouc3. Aromatic oil of clove
D. Eugenol4. Hormone

 

Code:ABCD
(a)4123
(b)1234
(c)4321
(d)2341
Correct Answer: (a)
Solution:Testosterone is a male sex hormone. Codeine is a sedative drug. Caoutchouc is an Indian rubber. Eugenol is an aromatic oil of clove.

39. Steel slag can be the materia! for which of the following?

1. Construction of base road

2. Improvement of agricultural soil

3. Production of cement

Select the correct answer using the code given below :

Correct Answer: (d) 1, 2 and 3
Solution:
  • Steel slag, an unavoidable by-product in iron and steel production. Developed countries like Japan, USA have taken lead in making fertilisers using steel-making slag, says 2018's article in Financial Express So, #2 is correct.
  • Steel Slag is used in road metal and bases, producing Portland slag cement. It is also used for soil conditioning. Says Handbook of Indian Bureau of mines page 6. So, All #3 statements correct.

40. Match List-I with List-II and select the correct answer from the codes given below:

List-I (Organisms)List-II (Chromosomes in pairs) 
A. Human1.  6 (= 12)
B.  Housefly2.  23 (46)
C. Mosquito3.  39 (=78)
D. Dog4.  3 (= 6)

 

Code:ABCD
(a)2143
(b)4321
(c)3412
(d)4312
Correct Answer: (a)
Solution:Humans have 23 pairs of chromosomes. Houseflies have 6 pairs of chromosomes. Mosquitoes have 3 pairs of chromosomes. Dogs have 39 pairs of chromosomes.