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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1801. |
For given water content, workability decreases if the concrete aggregates contain an excess of |
| A. | thin particles |
| B. | flat particles |
| C. | elongated particles |
| D. | all the above. |
| Answer» E. | |
| 1802. |
The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as |
| A. | low-heat Portland cement |
| B. | rapid hardening Portland cement |
| C. | Portland blast slag cement |
| D. | Portland pozzolana cement |
| Answer» B. rapid hardening Portland cement | |
| 1803. |
Shrinkage in concrete can be reduced by using |
| A. | low water cement ratio |
| B. | less cement in the concrete |
| C. | proper concrete mix |
| D. | all the above. |
| Answer» E. | |
| 1804. |
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is, |
| A. | 20% |
| B. | 25% |
| C. | 30% |
| D. | 35% |
| Answer» C. 30% | |
| 1805. |
If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is |
| A. | M 100 |
| B. | M 150 |
| C. | M 200 |
| D. | M 250 |
| Answer» B. M 150 | |
| 1806. |
For compacting plain concrete road surface of thickness less than 20 cm, we use |
| A. | internal vibrator |
| B. | screed vibrator |
| C. | form vibrator |
| D. | none of these. |
| Answer» C. form vibrator | |
| 1807. |
If a grading curve is horizontal bet-wen the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain |
| A. | 20 mm particles |
| B. | 10 mm particles |
| C. | 4.75 mm particles |
| D. | all the above. |
| Answer» E. | |
| 1808. |
Efflorescence in cement is caused due to an excess of |
| A. | alumina |
| B. | iron oxide |
| C. | silica |
| D. | alkalis |
| Answer» E. | |
| 1809. |
Workability of concrete for a given water content is good if the aggregates, are |
| A. | rounded aggregate |
| B. | irregular aggregate |
| C. | angular aggregate |
| D. | flaky aggregates. |
| Answer» B. irregular aggregate | |
| 1810. |
Proper batching ensures |
| A. | economy |
| B. | durability |
| C. | workability |
| D. | all the above. |
| Answer» E. | |
| 1811. |
Internal friction between the ingredients of concrete, is decreased by using |
| A. | less water |
| B. | fine aggregates |
| C. | rich mix |
| D. | more water and coarse aggregates |
| Answer» E. | |
| 1812. |
Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor Wp/Wf is 0.95, the workability of concrete is |
| A. | extremely low |
| B. | very low |
| C. | low |
| D. | high |
| Answer» E. | |
| 1813. |
Under normal conditions using an ordinary cement, the period of removal of the form work, is : |
| A. | 7 days for beam soffits |
| B. | 14 days for bottom slabs of spans 4.6 m and more |
| C. | 21 days for bottom beams over 6 m spans |
| D. | all the above. |
| Answer» E. | |
| 1814. |
For quality control of Portland cement, the test essentially done is |
| A. | setting time |
| B. | soundness |
| C. | tensile strength |
| D. | all the above. |
| Answer» E. | |
| 1815. |
The rock which is not calcareous, is : |
| A. | lime stone |
| B. | macl |
| C. | chalk |
| D. | laterite |
| Answer» E. | |
| 1816. |
Particles of 0.002 mm size are that of |
| A. | clay |
| B. | sand |
| C. | gravel |
| D. | none of these. |
| Answer» B. sand | |
| 1817. |
High temperature |
| A. | increases the strength of concrete |
| B. | decreases the strength of concrete |
| C. | has no effect on the strength of concrete |
| D. | none of these. |
| Answer» C. has no effect on the strength of concrete | |
| 1818. |
Pick up the incorrect statemnt from the following. For performing compressive strength test of cement |
| A. | cement and standard sand mortar are used in the ratio of 1 : 3 |
| B. | water is added at the rate of P/4 + 3.0 percentage of water where P is the percentage of water for standard consistency |
| C. | A cube mould of 10 cm x 10 cm x 10 cm is used |
| D. | The perpared moulds are kept in a atmosphere of 50% relative humidity |
| Answer» B. water is added at the rate of P/4 + 3.0 percentage of water where P is the percentage of water for standard consistency | |
| 1819. |
A concrete having a slump of 6.5 cm, is said to be |
| A. | dry |
| B. | earth moist |
| C. | semi-plastic |
| D. | plastic |
| Answer» E. | |
| 1820. |
Too wet concrete may cause |
| A. | weakness of concrete |
| B. | excessive laitance |
| C. | segregation |
| D. | all the above. |
| Answer» E. | |
| 1821. |
According to Water-Cement Ratio Law, the strength of workable plastic concrete |
| A. | depends upon the amount of water used in the mix |
| B. | does not depend upon the quality of cement mixed with aggregates |
| C. | does not depend upon the quanity of cement mixed with aggregates |
| D. | all the above. |
| Answer» E. | |
| 1822. |
Sands of zone I are |
| A. | coarse |
| B. | medium |
| C. | medium to fine |
| D. | fine. |
| Answer» B. medium | |
| 1823. |
The diameter of the Vicat plunger is 10 mm and its length varies from |
| A. | 20 mm to 30 mm |
| B. | 30 mm to 40 mm |
| C. | 40 mm to 50 mm |
| D. | 50 mm to 60 mm |
| Answer» D. 50 mm to 60 mm | |
| 1824. |
The datum temperature for maturity by Plowman, is |
| A. | 23°C |
| B. | 0° |
| C. | - 5.6°C |
| D. | - 11.7°C |
| Answer» E. | |
| 1825. |
Construction joints are generally provided in concrete |
| A. | roads |
| B. | retaining walls |
| C. | lining of canals |
| D. | all the above. |
| Answer» E. | |
| 1826. |
Vicat apparatus is used for |
| A. | fineness test |
| B. | consistency test |
| C. | test for setting time |
| D. | test for tensile strength |
| Answer» C. test for setting time | |
| 1827. |
Le-Chatelier's apparatus is used for testing |
| A. | soundness of cement |
| B. | hardness of cement |
| C. | strength of cement |
| D. | durability of cement. |
| Answer» B. hardness of cement | |
| 1828. |
Water cement ratio is |
| A. | volume of water to that of cement |
| B. | weight of water to that of cement |
| C. | weight of concrete to that of water |
| D. | both (a) and (b) of the above. |
| Answer» E. | |
| 1829. |
The main object of compaction of concrete, is: |
| A. | to eliminate air holes |
| B. | to achieve maximum density |
| C. | to provide initimate contact between the concrete and embedded materials |
| D. | all the above. |
| Answer» E. | |
| 1830. |
According to the recommendations of IS : 456-1978, the expansion joints |
| A. | are provided where plane changes abruptly |
| B. | are provided to ensure minimum resistance |
| C. | are supported on separate columns |
| D. | all the above. |
| Answer» E. | |
| 1831. |
Pick up the incorrect statement from the following. While performing preliminary test on concrete |
| A. | proportions of the material and water should be the same as to be used at the work site |
| B. | cement should be mixed by hand in order to maintain uniformity |
| C. | concrete mix should be stored in air-tight containers |
| D. | concrete ingredients should be kept at a temperature of 37° ± 2°C |
| Answer» E. | |
| 1832. |
Saw dust can be rendered chemically inert by boiling it in water containing |
| A. | ferrous sulphate |
| B. | potassium chloride |
| C. | ammonia |
| D. | nitric acid |
| Answer» B. potassium chloride | |
| 1833. |
In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for |
| A. | 20 times |
| B. | 25 times |
| C. | 30 times |
| D. | 40 times |
| Answer» C. 30 times | |
| 1834. |
The type of aggregates of same nominal size, which contain less voids when compacted, are |
| A. | rounded spherical |
| B. | irregular |
| C. | flaky |
| D. | none of these. |
| Answer» B. irregular | |
| 1835. |
The light weight aggregates are obtained from |
| A. | sedimentary rocks |
| B. | metamorphic rocks |
| C. | igneous rocks |
| D. | volcanic source. |
| Answer» E. | |
| 1836. |
For the construction of the retaining structures, the type of concrete mix to be used, is |
| A. | 1 : 3 : 6 |
| B. | 1 : 2 :4 |
| C. | 1 : 1.5 : 3 |
| D. | 1 : l : 2 |
| Answer» D. 1 : l : 2 | |
| 1837. |
An excess of flaky particles in concrete aggregates |
| A. | decreases the workability |
| B. | increases the quantity of water and sand |
| C. | affects the durability of concrete |
| D. | all the above. |
| Answer» E. | |
| 1838. |
The size of fine aggregates does not exceed |
| A. | 2.75 mm |
| B. | 3.00 mm |
| C. | 3.75 mm |
| D. | 4.75 mm |
| Answer» E. | |
| 1839. |
Log Angles machine is used to test the aggregate for |
| A. | crushing strength |
| B. | impact value |
| C. | abrasion resistance |
| D. | water absorption |
| Answer» D. water absorption | |
| 1840. |
The surface where two successive placements of concrete meet, is known as |
| A. | Contraction joint |
| B. | Expansion joint |
| C. | Construction joint |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 1841. |
Concrete gains strength due to |
| A. | chemical reaction of cement with sand and coarse aggregates |
| B. | evaporation of water from concrete |
| C. | hydration of cement |
| D. | All the above. |
| Answer» D. All the above. | |
| 1842. |
Segregation is responsible for |
| A. | honey-combed concrete |
| B. | porous layers in concrete |
| C. | surface scaling in concrete |
| D. | all the above. |
| Answer» E. | |
| 1843. |
The specifications of a cement bag for storage, are |
| A. | weight 50 kg |
| B. | height 18 cm |
| C. | plan area 3000 sq. cm |
| D. | all the above. |
| Answer» E. | |
| 1844. |
The entrained air in concrete |
| A. | increases workability |
| B. | decreases workability |
| C. | decreases resistance to weathering |
| D. | increases strength |
| Answer» B. decreases workability | |
| 1845. |
On a grading curve, the gap grading is represented by |
| A. | a horizontal line |
| B. | a vertical line |
| C. | N.W. inclined line |
| D. | N.E. inclined line |
| Answer» B. a vertical line | |
| 1846. |
The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known |
| A. | grading |
| B. | curing |
| C. | mixing |
| D. | batching |
| Answer» E. | |
| 1847. |
Transport of concrete by pumps, is done for a distance of |
| A. | 100 m |
| B. | 200 m |
| C. | 300 m |
| D. | 400 m |
| Answer» E. | |
| 1848. |
Pick up the correct proportions of chemical ingredients of cement |
| A. | Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3 |
| B. | Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 |
| C. | Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3 |
| D. | Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3 |
| Answer» B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3 | |
| 1849. |
The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds |
| A. | 5 kg/cm² |
| B. | 8 kg/cm² |
| C. | 10 kg/cm² |
| D. | 15 kg/cm² |
| Answer» E. | |
| 1850. |
The increased cohesiveness of concrete, makes it |
| A. | less liable to segregation |
| B. | more liable to segregation |
| C. | more liable to bleeding |
| D. | more liable for surface scaling in frosty weather |
| Answer» B. more liable to segregation | |