| Post Name | Assistant Tester cum Guager - Malabar Cements Ltd |
|---|---|
| Question Paper Code | 010/2024/OL |
| Category Code | 154/2020 |
| Date of Test | 23 January 2024 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Strong base among the following is
Answer
D. CH₃COO⁻
2
The conjugate base of HCO₃⁻ is
Answer
C. CO₃²⁻
3
Among the following which is not a Lewis acid
Answer
D. PH₃
4
Most organic compounds are more soluble in liquid ammonia than they are in water because (i) ammonia is less polar than water (ii) ammonia has lower cohesion energy (iii) intermolecular forces make it possible for organic molecules to create cavities in liquid ammonia
Answer
D. (i), (ii) and (iii) only
5
Alkali metals dissolve in liquid ammonia and in appearance all the solutions are blue when dilute and exhibit conductivity and are paramagnetic due to
Answer
B. ammoniated electrons
6
Which of the following is isoelectronic and isostructural with H₂O?
Answer
A. H₂F⁺
7
In liquid sulphuric acid, acetic acid ionises as
Answer
D. CH₃COOH+H₂SO₄→CH₃COOH₂⁺+HSO₄⁻
8
Which of the following is incorrect about liquid ammonia?
Answer
D. high temperature and low pressure is necessary while working with liquid ammonia
9
Which among the following are conjugate acid-base pairs? (i) and (ii) and (iii) and (iv) and
Answer
B. (ii) and (iv) only
10
When AgCl is treated with liquid ammonia, the product obtained is
Answer
C. Ag(NH₃)₂Cl
11
The arrangement of anions and cations in NaCl crystal (Rock salt structure) is
Answer
D. fcc array of anions in which cations occupy all octahedral holes
12
The radius of cations in a solid measures 40 pm and anion measures 72 pm. Predict the co-ordination number of cation and structure of solid
Answer
D. 6, octahedral
13
The dimensions of a unit cell is determined by axial distances a, b and c and axial angles Name the following crystal system : Axial distance Axial angle °
Answer
B. Orthorhombic
14
Atoms of element P form hcp lattice and those of the element Q occupy ⅔rd of octahedral voids. The formula of the compound is?
Answer
C. P₃Q₂
15
Packing efficiency of ccp structure is
Answer
D. 74%
16
Solid 'P' is insulator in solid state but conductor in molten state and in aqueous solutions. What type of solid is it?
Answer
C. Ionic
17
Cobalt crystallises in hexagonal close packed structure. Its atomic radius is 200 pm. The length of side (a) of unit cell is (Given )
Answer
A. 566 pm
18
A compound forms cubic close packed structure. What is the total number of voids in 1 mole of it?
Answer
C. 18.066 ×
19
Copper crystallises such that the lattice get ABC ABC arrangement of layers. This type of three dimensional packing is called
Answer
A. Cubic close packing
20
Which of the following statements are incorrect about crystalline solid? (i) Melt at a sharp and characteristic temperature (ii) Definite and characteristic heat of fusion (iii) Isotropic (iv) Short range order
Answer
D. Only (iii) and (iv)
21
Rain water is called acid rain when its pH is
Answer
A. Below 5.6
22
Carbon monoxide is one of the serious air pollutant. Then which option is wrong?
Answer
D. Oxygen carrying capacity of blood increases
23
Match the items given in column I with those in column II and select the correct option given below : Column I Column II 1. Mercury a. Itai-itai 2. Cadmium b. Methemoglobinemia 3. nitrate c. Mina matha disease
Answer
B. 1-c, 2-a, 3-b
24
Which of the following is not a harmful effect of ozone layer depletion?
Answer
C. UV radiation cannot enter into troposphere
25
DDT is a non degradable pollutant and is chemically
Answer
A. Dichloro diphenyl trichloro ethane
26
Which of the following compound is not regarded as air pollutant?
Answer
C. CO₂
27
The wrong statement about classical smog is
Answer
D. classical smog is an oxidising smog
28
Ozone layer is present in which zone of atmosphere
Answer
B. Stratosphere
29
Which is not a green house gas?
Answer
D. Dinitrogen pentoxide
30
Biochemical oxygen demand is a method for
Answer
C. Estimating the amount of organic matter in water
31
Two instruments used for measuring length having resolution 0.1 cm and 0.01 cm. Then which of the following option for below statements are correct Statement I : First measurement have more accuracy but less precision. Statement II : Second measurement have more accuracy and more precision.
Answer
B. Statement I is correct and II is wrong
32
The error associated with the resolution of an instrument is
Answer
C. Least count error
33
Which among the following is not the source of systematic error?
Answer
B. Random error
34
The magnitude of the difference between the individual measurement and true value of quantity is
Answer
D. Absolute error
35
Statement I : Precision gives the resolution or limit of quantity measured. Statement II : Accuracy means a measure of how measured value is to the true value of the quantity.
Answer
A. Both statements are correct
36
Statement I : The number of significant figures indicate the accuracy with which the physical quantity is measured. Statement II : If the number of significant figure increases the accuracy of measurement decreases.
Answer
C. Statement I is correct and II is wrong
37
The number of significant figure in 0.00082064 is
Answer
A. 5
38
Taking into account of significant figures, what is the value of 8.88 m ___ 0.0088 m.
Answer
B. 8.87 m
39
The number of significant figures for measurement of length 182 cm, 0.182 cm and 0.0182 cm are
Answer
D. 3, 3, 3 respectively
40
Accuracy in measurement of mass 9.99 g is g. Then percentage of relative error is
Answer
A. %
41
Measurement which is close to the true value is
Answer
B. Accurate
42
Which of the following is a buffer solution?
Answer
A. CH₃COOH+CH₃COONa
43
Which of the following is used as an indicator in the titrations of strong acid and a weak base?
Answer
B. Methylorange
44
Indeterminate errors also called
Answer
C. both 1 and 2
45
When foreign ion get trapped in growing crystal is called
Answer
B. Occlusion
46
The normal rain water is acidic due to
Answer
D. CO₂
47
The pH range of methyl orange as an indicator is
Answer
C. 3 - 5
48
Which of the following gravimetric analysis uses temperature as a function to measure a materials physical and chemical properties
Answer
D. thermogravimetry
49
Which of the following analytical method is based on the weight of the precipitate formed
Answer
D. Gravimetric analysis
50
Which of the following is a sparingly soluble salt?
Answer
D. All of these
51
Impurities are absorbed in the surface of the precipitate is called
Answer
A. Surface adsorption
52
When applied to scientific measurements the words accuracy and precision?
Answer
C. have distinctly different meanings
53
The oxidation state of Mn in is
Answer
D. 7
54
EDTA is a
Answer
B. Hexadentate ligand
55
Which error gives always positive error?
Answer
A. Post precipitation
56
Which of the following is used as an indicator in the titration of iodine with hypo?
Answer
B. Starch
57
The amount of NaOH used in the titration of 100 ml 0.1 N HCl is
Answer
A. 0.4 g
58
Identify the incorrect statement about rust
Answer
A. Rust and Iron have the same composition
59
The equivalent weight of an acid is calculated by
Answer
C. Molecular weight / basicity
60
Which sentence is true about digestion?
Answer
C. It is produced larger precipitate
61
Gypsum is
Answer
A. CaSO₄·2H₂O
62
Average amount of Alumina ( ) in portland cement is
Answer
A. 5 - 10%
63
7 days compressive strength of 43 grade cement is
Answer
B. 33 N/mm²
64
IS code for 53 grade cement is
Answer
C. IS 12269 - 1987
65
Initial and final setting time for ordinary Portland cement is
Answer
A. 30 minutes and 600 minutes respectively
66
Relationship between initial setting time and final setting time is
Answer
A. FSTₘᵢₙ=90+1.2(ISTₘᵢₙ)
67
Which of the following statement is/are correct about setting of cement (i) setting is hardening of cement (ii) setting time is the time required for stiffening of cement paste to defined consistency (iii) initial setting time is the time when the paste starts losing its plasticity
Answer
C. (ii) and (iii) are correct
68
Match the points : Type of cement Name of cement (a) Type IL (i) Portland - slag cement (b) Type IS (ii) Ternary - blended cement (c) Type IP (iii) Portland - Lime stone cement (d) Type IT (iv) Portland - Pozzolana cement
Answer
B. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
69
White cement gives walls more adhesive strength due to presence of
Answer
D. Iron and Magnesium
70
Fitness (specific area) of 33 grade cement is
Answer
A. 300 /kg
71
The substance responsible for flash setting of cement
Answer
B. Tri calcium aluminate
72
Common name of Dicalcium silicate is
Answer
B. belite
73
White clinker contains
Answer
A. 76% alite 15% belite 7% tri calcium aluminate and 2% free lime
74
Which of the following statements is incorrect ? (i) Alumina imparts quick setting property to the cement (ii) Excess magnesia will increase the strength of the cement (iii) slows down or retards the setting action of cement
Answer
C. (i) and (iii) are correct and (ii) is incorrect
75
Standard consistency test for cement is done by using
Answer
D. Vicat's apparatus
76
Air permeability test for cement is to test
Answer
B. Fineness
77
Average percentage of Gypsum mixed with chinker to slow the setting of cement
Answer
A. 2 - 3%
78
Match the points : Cement type IS Code (a) Portland-Pozzolana (i) IS 445 - 1989 (b) Rapid hardening cement (ii) IS 1489 - 1991 (c) Portland -slag cement (iii) IS 12600 - 1989 (d) Low heat cement (iv) IS 8041 - 1990
Answer
C. (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
79
Tobermorute gel is
Answer
B. 3CaO·SiO₂·6H₂O
80
Who invented Portland cement in which year?
Answer
A. Joseph Aspdin 1824
81
Which of the following is localised form of corrosion?
Answer
A. Pitting
82
_____ corrosion occurs at the contact area of the two materials which are joined together.
Answer
A. Fretting
83
Aluminium doesn't corrode. Unlike other metals even though it is reactive. Why?
Answer
B. Aluminium is covered with thin layer of aluminium oxide
84
Which metal can displace hydrogen from acids?
Answer
C. Na
85
Identify the correct set of method used for the prevention of corrosion
Answer
D. Galvanising, Electroplating, Painting
86
Chemicaly ettringite is
Answer
C. Calcium sulpho aluminate
87
Main reason behind corrosion of steel in reinforced concrete
Answer
A. Chloride induced corrosion
88
Applying a layer of zinc on the surface of metal is called
Answer
B. Galvanization
89
Main disadvantage of corrosion
Answer
A. Corrosion weakens the iron objects
90
One students wanted to prevent the corrosion of ball made of steel. Which of the following method cannot be used for prevention of corrosion?
Answer
B. By coating it with copper
91
Which of the following are example of open system. (a) All chemical reactions carried out in closed containers (b) Human body (c) All chemical reactions carried out in open containers
Answer
C. (b) and (c)
92
Calculate the change in internal energy of a system which absorbs 250 kJ of heat and does 100 kJ of work
Answer
D. 150 kJ
93
The amount of heat required to raise the temperature of 100 g of water through 1°C is called
Answer
A. Heat capacity of water
94
Which of the following denotes specific heat capacity amount of heat required to raise temperature of
Answer
D. 1 g of water through 1°C
95
For 3 moles of an ideal gas what is the difference b/n molar heat capacity at constant pressure and molar heat capacity at constant volume?
Answer
B. 3R
96
Lattice enthalpy of an ionic solid is determined by
Answer
B. Born-Habercycle
97
Measure of disorder is called
Answer
B. Entropy
98
The difference between enthalpy and product of temperature and entropy of a substance is
Answer
A. G
99
Std Free Energy change and equilibrium constant is related as (a) ΔG° = ΔH° - TΔS° (b) ΔG° = -2.303 RT log K (c) ΔG° = -RT ln K (d) ΔG° = -RT log K
Answer
C. Only (b) and (c) correct
100
For the reaction 3A + 2B → C at 298 K, ΔH = 400 kJ mol⁻¹ and ΔS = 0.2 kJ mol⁻¹ K⁻¹. At what temperature will the reaction become spontaneous?
Answer
C. Above 2000 K
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