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DFCCIL’21 CE: Daily Practice Quiz. 11-Aug-2021

Quiz: Civil Engineering
Exam: DFCCIL-JE
Topic: MISCELLANEOUS

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 8 Minutes

Q1. For a statically indeterminate pin jointed plane frame, the relation between number of member ‘m’ and number of joints ‘j’ is expressed as:
(a) m=3j-6
(b) m>2j-3
(c) m=2j-3
(d) m>3j-6

Q2. For assessing the strength of a structure for limit state of collapse, the values of partial safety factors for steel and concrete are taken respectively as:
(a) 1.15 and 1.5
(b) 1.5 and 1.5
(c) 1.5 and 1.15
(d) 1.15 and 1.15

Q3. Quick setting cement is produced by adding ______.
(a) Less amount of gypsum in very fine powdered form
(b) More amount of gypsum in very fine powdered form
(c) Aluminium sulphate in very fine powdered form
(d) Pozzolana in very fine powdered form

Q4. Strength of cement concrete primarily depends upon ______.
(a) Quality of water
(b) Quantity of aggregate
(c) Quantity of cement
(d) Water-cement ratio

Q5. If the smallest division of a Vernier is longer than the smallest division of its primary scale, the Vernier is known as _______.
(a) Direct Vernier
(b) Double Vernier
(c) Simple Vernier
(d) Retrograde Vernier

Q6. The slope correction for a length of 30 m along a gradient of 1 in 20 is ______.
(a) 3.75 cm
(b) 0.375 cm
(c)37.5 cm
(d) 2.75 cm

SOLUTION

S1. Ans.(b)
Sol. m + 3 = 2j → Static Determinate structure
m + 3 > 2j → Static Indeterminate structure
m + 3 < 2j → Unstable structure

S2. Ans.(a)
Sol. As per IS 456:2000, the values of partial safety factors for steel and concrete are taken as 1.15 and 1.5 respectively.

S3. Ans.(c)
Sol. Quick Setting Cement as the name indicates, these types of cements are used where quick setting is needed. The quick setting cement is manufactured by adding a small percentage of aluminum sulphate and then it is finely grinded with cement. The Initial setting time of quick setting cement is 5 minutes and Final setting time is 30 minutes.

S4. Ans.(d)
Sol. The most important factor of determining the strength of concrete is water cement ratio. It is the ratio of mixing water to that of cement in the mixture.

S5. Ans.(d)
Sol. A retrograde vernier is similar to the direct vernier, except its graduations are at a slightly larger spacing. In direct vernier it has N no. of graduation but in retrograde Vernier it has N+1 no. of graduations. Both Direct and retrograde verniers are read in the same manner.

S6. Ans.(a)
Sol. Given, Length=30m, h= 1/(√(〖(20)〗^2+1) )×30=1.5m.
Correction for a slope = h^2/2l = 〖1.5〗^2/(2×30) = 0.0375m. =3.75 cm.

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