Quiz: Civil Engineering
Each question carries 1 mark
Negative marking: 1/3 mark
Time: 8 Minutes
Q1. The nominal size of the modular brick is
(a) 190 mm × 90 mm × 80 mm
(b) 190 mm × 190 mm × 90 mm
(c) 200 mm × 100 mm × 100 mm
(d) 200 mm × 200 mm × 100 mm
Q2. As per IS : 800 in case of webs stiffened both vertically and horizontally, the minimum thickness of web should not be less than
Q3. Steel has its yield strength of 400 N/mm² and modulus of elasticity of 2 × 105 MPa. Assuming the material to obey Hook’s law up to yielding, what is its proof resilience?
(a) 0.8 N/mm²
(b) 0.4 N/mm²
(c) 0.6 N/mm²
(d) 0.7 N/mm²
Q4. If specific yield of particular sand is 30% and its porosity is 50%, then the specific retention of the sand will be
Q5. The ruling gradient for plain and rolling terrain is
(d) 4 %
Q6. If the magnetic bearing of the sun at a place at noon in the southern hemisphere is 167°, the magnetic declination at that place is
Sol. A brick of standard size. (190 mm × 90 mm × 90 mm) is recommended by BIS with mortar thickness, the size of such brick becomes (200 mm × 100 mm × 100 mm) and it is known as nominal size of modular brick.
Sol. As per IS:800, If webs stiffened both vertically and horizontally, then minimum thickness of web should not be less than d/250.
Sol. Proof Resilience:
U_max = 〖σ_y〗^2/2E = (400)^2/(2 × 2 × 10^5 ) = 0.4 N/mm^2
Specific yield (S_y) = 30%
Porosity (n) = 50%
Specific retention (S_R) =?
Sol. The ruling gradient for plain and rolling terrain is 3.3% or 1 in 30 while for mountainous terrain it is 5% or 1 in 20.
Sol. magnetic bearing = 167°
Magnetic declination = 180°-167°
The value given in southern hemisphere. Then
Magnetic declination = 13°E