PWD, WRD, SSC, MPSC, ZP, नगरपरिषद, जलसंपदा, सरळसेवा परीक्षा साठी उपयुक्त
1➤ Smith's test of stones is performed to find out:
ⓐ the compressive strength of the stone ⓑ the hardness of the stone ⓒ the presence of soluble matter in a sample of stone ⓓ none
➤ the presence of soluble matter in a sample of stone
2➤ Hardness of the stones can be tested by _______ in the laboratory.
ⓐ impact test ⓑ Mohs hardness test ⓒ abrasion test ⓓ crusing test
➤ Mohs hardness test
It is measured by Mohs hardness test in which the mineral substances of known variation in hardness are used to scratch the rock
Abrasion test - Hardness Test
Crusing strenghth- Compressive Strength
Impact Test -Toughness
3➤ The azimuth of a line is the:
ⓐ Clockwise angle that a line makes with the south end of the selected material ⓑ Clockwise angle that a line makes with the north end of the selected material ⓒ Anti-clockwise angle that a line makes with the south end of the selected material ⓓ none
➤ Clockwise angle that a line makes with the north end of the selected material
The Azimuth is the angle of the line through the Assumed Position towards the geographic position of the celestial body. This angle is given in degrees starting at north, going clockwise. The Line of Position is perpendicular to the Azimuth line
4➤ In plane table survey, the error due to centering should not exceed the scale divided by ________
ⓐ 30 ⓑ 50 ⓒ 40 ⓓ 80
➤ 40
Centring is very important for plotting detail through plane table surveying. Error in centring leads to error in plotting of location of objects.
So, the operations involved in centring need careful consideration. The error due to centering should not exceed the scale divided by 40.
5➤ Which of the following error is most likely to occur in the plane table surveying?
ⓐ Error in orientation ⓑ Error in leveling ⓒ Error in sighting ⓓ Error in measurement
➤ Error in orientation
Orientation may be defined as the operation keeping the table at each successive stations parallel to the position occupied by the first station. So the relative positions of various points are most likely to be different from the actual ones. This is the main reason why error in orientation is most likely to occur in plane table surveying.
Although remaining errors will occur in plane table like Error in sighting, Error in levelling and error in measurement, those can be nearly eliminated by back sighting, use of level screws and re-checking respectively.
6➤ Which of the below is not a temporary adjustment of the prismatic compass?
In a prismatic compass, the sight vanes are generally not adjustable.
In surveyor’s compass, it’s one of the permanent adjustments done.
7➤ ________ is a term used that prevents the needle from pointing to the magnetic North in a given locality.
ⓐ Local distraction ⓑ Local attraction ⓒ Deviation ⓓ Declination
➤ Local attraction
While reading a compass, sometimes needle might be slightly deviated from magnetic North. It can be due to any weather conditions, magnetic objects nearby. It has to be corrected to get accurate readings.
8➤ Which of the following instrument is used for centering the theodolite in windy conditions?
Optical plummet: A device on some transits and theodolites used to centre the instrument over a point, in place of a plumb bob, which moves in a strong wind.
Optical Square: a small hand instrument used by surveyors for laying off a right angle by means of two mirrors set at an angle of 45 degrees.
Cross staff: The cross-staff is an instrument used to measure angles and altitudes, consisting of a trigonometrically graduated staff and one or more perpendicular vanes moving over it.
9➤ effective length of column effectively held in position and restrained in direction at both ends
ⓐ 0.67L ⓑ 0.85L ⓒ 1L ⓓ 3L
➤ 0.67L
For column, the effective length of a column effectively held in position and restrained in directions at both ends is 0.67 L.
Effectively held in position at both ends restrained against rotation at one end is 0.80 L
10➤ The slenderness ratio of a column which is supports throughout its length by masonry wall is
ⓐ zero ⓑ 100 ⓒ 1.2 ⓓ 1
➤ zero
Effective length is defined as the distance between two adjacent points of zero bending moment or contra flexure.
The value of the effective length varies according to the support condition. Where Leq is the effective length of the column
11➤ The slenderness ratio of a column is zero when its length
ⓐ is equal to its radius of gyration ⓑ zero ⓒ is supported on all sides throughout its length ⓓ None of these
➤ is supported on all sides throughout its length
12➤ The combined effect of curvature and refraction over a distance L kilometres is
ⓐ 67.2 L2 mm ⓑ 64.5 L2 mm ⓒ 76.3 L2 mm ⓓ none of these.
➤ 67.2 L2 mm
13➤ Which of the below property of aggregates is not desirable? )
14➤ How does the strength of concrete differ with age of concrete?
ⓐ Increases ⓑ Decreases ⓒ No effect ⓓ Increases, then decreases
➤ Increases
It increases with increase in age. The strength measured after days, months and years shows an increase. It takes 28 days for concrete to attain full strength. However, it continues to attain strength even after 28 days
15➤ Permanent dimension changes due to loading is termed as:
ⓐ Strain ⓑ Creep ⓒ Extent ⓓ Ambit
➤ Creep
Concrete shrinks with age. The changes in dimension are called creep.
It is determined using creep coefficient which is the ratio of ultimate creep strain to elastic strain at the age of loading.
16➤ Which admixture is used to improve workability?
Plasticizers help to increase the workability of concrete without altering the water-cement ratio.
It is very helpful as it provides the required workability, at the same time does not compromise on strength.
17➤ Bleeding is good to an extent if it occurs when concrete is:
ⓐ Plastic ⓑ Transported ⓒ Placed ⓓ Mixed
➤ Plastic
While the concrete is still plastic, the accumulated water due to bleeding can be used to mix concrete again and improve workability. It also benefits by further reducing water-cement ratio.
18➤ M15 concrete is used for:
ⓐ Dams ⓑ Foundation ⓒ R.C.C ⓓ Mass concreting works
➤ Foundation
M10 is used for Mass concrete works, dams, etc.
M20 is used for R.C.C. structures.
M15 can be used for ground floor construction also.
19➤ In design of R.C.C. structures, the tensile strength of concrete is taken as:
ⓐ 5N/mm ⓑ 0.3N/mm2 ⓒ 2N/mm2 ⓓ 0
➤ 0
Since concrete does not take up tensile loads, it is taken as zero.
But IS 456-2000 recommends the tensile strength to be calculated using Ft = 0.7√fck N/mm2
20➤ In absorption test on brick, how many hours it has to be soaked in cold water?
ⓐ 5 hours ⓑ 6 hours ⓒ 19 hours ⓓ 24 hours
➤ 24 hours
21➤ What is the loading rate used in compressive strength test?
ⓐ 7 N/mm2 per minute ⓑ 20 N/mm2 per minute ⓒ 14 N/mm2 per minute ⓓ 40 N/mm2 per hour
➤ 14 N/mm2 per minute
the loading on brick specimen in a CTM should be uniform at rate of 14 N/mm2 per minute
22➤ How is the hardness of brick tested?
ⓐ Using finger nail ⓑ Using hardness apparatus ⓒ Using hammer ⓓ Using chisel
➤ Using finger nail
23➤ What is the maximum permissible tolerance for length and width respectively?
ⓐ ± 3mm and ± 6mm ⓑ ± 6mm and ± 3mm ⓒ ± 6cm and ±2cm ⓓ ± 3cm and ± 6cm
➤ ± 6mm and ± 3mm
The standard size of brick is length – 190mm and width – 90mm. When manufactured, size variations may occur by expansion or contraction while drying and burning process. Permissible tolerance is ± 6mm for length and ± 3mm for width and height.
24➤ What should be observed ideally when two bricks are struck together?
