Cement MCQ – Building Materials

61. The standard test method is used to estimate the characteristic strength of 43 grade cement. In order to conform with the Indian Standard requirement, the minimum characteristic strength (MPa) should be

1. 33
2. 53
3. 63
4. 43

62. Which of the following properties is assessed using Le Chatelier’s test?

1. Strength
2. Soundness
3. Setting time
4. Shrinkage

63. Gypsum is added in the manufacture of Portland Cement in order to

1. Shorten the setting time of cement
2. Lengthen the setting time of cement
3. Decrease the burning temperature
4. Decrease the grinding time

64. IS 12269 deals with

1. 53 grade Ordinary portland cement
2. 43 grade Ordinary portland cement
3. 33 grade Ordinary portland cement
4. Sleeper cements

65. Increase in the fineness of cement results in

1. Increase in the rate of heat of hydration without changing the total amount of heat liberated
2. Decrease in the rate of heat of hydration without changing the total amount of heat liberated
3. Increase in the rate of heat of hydration with an increase in the total amount of heat liberated
4. Decrease in the rate of heat of hydration with a reduced amount of heat liberated

66. Total sulphur content of cement is less than

1. 2.5%
2. 0.025%
3. 5%
4. 0.25%

67. The contribution of constituents of cement to the strength of cement is in the decreasing order

1. C₃S, C₂S, C₃A and C₄AF
2. C₂S, C₄AF, C₃S and C₃A
3. C₂S, C₃S, C₃A and C₄AF
4. C₃S, C₃A, C₂S and C₄AF

68. A sample of cement is said to be sound when it does not contain free

1. Lime
2. Iron oxide
3. Silica
4. Alumina

69. In preparing cement concrete by volume the size of wooden box used to measure sand aggregate is

1. 40 × 25 × 30 cm
2. 35 × 25 × 40 cm
3. 15 × 15 × 15 cm
4. None of the above

70. The initial setting time of near cement paste should be minimum of X (min) as per IS 8112, where X (min) is

1. 30
2. 10
3. 60
4. 45

71. What should be the consistency, in mm, of the mortars used for filling cavities?

1. 100 – 125
2. 90 – 130
3. 70 – 80
4. 130 – 150

72. For the Abrams w/c-strength law to be valid, which of the following pre-conditions is necessary?

1. the water used should be potable
2. the cement must be consumed within 7-days
3. the concrete should be kept in formwork for at least 7-days
4. the concrete should be fully compacted

73. In the context of use of OPC and other cementations materials used in concrete, consider the following statements:

Statement-1: Bogue’s equations are used to determine amounts of oxides of calcium, silicon, etc. in a given cement as the amounts of C₃S, C₂S, C₃A and C₄AF are known

Statement-2: Particle of both OPC and fly ash are spherical in shape.

Which of the following is CORRECT?

1. Both statements are TRUE
2. STATEMENT-1 is FALSE and Statement-2 is TRUE
3. STATEMENT-1 is TRUE and Statement-2 is FALSE
4. Both statements are FALSE

74. If the Na₂O and K₂O content in a given cement is 1.0% and 0.5%, the total alkali content in the cement in terms of Equivalent Na₂O can be taken as

1. 1.5%
2. 1.1%
3. 1.3%
4. 1.0%

75. In the context of testing of cements in the laboratory, consider the following statements:

Statement-I: The Blaine method of determination of fineness is based on measurement on void ratio.

Statement-II: The determination of initial and final setting time is based on change in penetration resistance over time due to continued hydration.

Which of the following is CORRECT?

1. Both statements are FALSE
2. STATEMENT-I is FALSE and Statement-II is TRUE
3. STATEMENT-I is TRUE and Statement-II is FALSE
4. Both statements are TRUE

76. The volume of one bag of cement weighing kg is

1. 0.05 m³
2. 0.0245 m³
3. 0.0445 m³
4. 0.0345 m³

77. Quantity of Gypsum in ordinary Portland cement is

1. 3%
2. 4%
3. 5%
4. 6%

78. Quick setting cement is produced by adding

1. less amount of gypsum in powder form
2. more amount of gypsum in powder form
3. aluminium sulphate in powder form
4. pozzolana in powder form

79. Finer the cement, more is the

1. strength of the cement
2. workability
3. shrinkage cracking
4. all of the above

80. For low alkali, content is usually restricted to X% by weight, where X is

1. 0.40
2. 0.04
3. 0.60
4. 0.50

81. The initial setting time of cement as specified in the Indian standards is

1. <30 min
2. >30 min
3. <600 min
4. 600 min

82. The constituent of cement that is responsible for all the undesirable property of cement due to its strong reactive nature of the Portland Clinker phases is

1. Tri-calcium silicate
2. Di-calcium silicate
3. Tetra-calcium alumino ferrite
4. Tri-calcium aluminate

83. If P is the percentage of water required for normal consistency, water to be added for determination of initial setting time is

1. 0.85P
2. 0.75P
3. 0.075P
4. 0.085P

84. For a 50 kg bag of cement, water required is

1. 20.5 liters
2. 22.5 1liters
3. 23.5 liters
4. 18.5 liters

85. Initial setting cement is caused due to

1. 2 CaO.SiO₂
2. 3 CaO.SiO₂
3. 4 CaO.Al₂O₃.Fe₂O₃
4. 3 CaO.Al₂O₃

86. Cement is said to be of good quality if

1. It is not smooth when rubbed in between fingers
2. It’s colour is greenish gray
3. A handful of cement thrown into a bucket of water does not float
4. None of the above

87. Soundness test of cement determines

1. Durability
2. Tensile strength
3. Quality of free lime
4. Initial setting

88. Portland Pozzolana cement possesses

1. Lower heat of hydration
2. Water tightness
3. Lower shrinkage on drying
4. All the above

89. The apparatus used for determining the Soundness of cement is

1. Le Chatelier apparatus
2. Slump Cone
3. Vicat’s needle
4. UTM

90. Silicosis is caused by which of the following?

1. O₂
2. Waste water
3. Dust from cement factories
4. None of the above