4.For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only! For Tutor Adil B Only!
7.Photon has mass or not? I am confused, since we say, it has zero rest mass but how does it is affected by gravity then?
Concrete comprises cement, fine and coarse particles with water that hardens with time. Concrete technology deals in the study of concrete and its properties with its application in building different construction such as beams, walls, slabs and columns. The different types of concrete with a mixture of other binding materials is used to construct various structures according to its strength, durability and endurance.
Question 1: Which of the following is a mixture of cement, sand, pebbles and water, which when allowed to cure, becomes hard like a stone.
a) Cement mortar b) Cement slurry
c) Cement solution d) Cement concrete
Answer: d) Cement concrete
Explanation: Cement concrete is a major building material in the construction of modern buildings.
Question 2: ___________ method, where the voids of coarse and fine aggregate are determined separately.
a) Maximum void b) Minimum void
c) Optimum void d) None of these
Answer: b) Minimum voidt
Explanation: In the minimum void method, the quantity
Question 3: Which of the following helps in increasing the strength of the concrete?
a) Increase in water-cement ratio b) Increase in fineness of cement
c) Decrease in water-cement ratio d) Decrease in fineness of cement
Answer: b) Increase in fineness of cement
Explanation: The fineness of cement affects the quantity of water
Question 4: The percentage of void in cement is approximately
a) 80% b) 60%
c) 40% d) 30%
Answer: c) 40%
Explanation: The void percentage
Question 5: What is the effect of adding calcium chloride in the concrete?
a) Increases shrinkage b) Decreases setting time
c) Both (a) and (b) d) None of these
Answer: c) Both (a) and (b)
Explanation: Calcium chloride accelerates the time of set and the rate of strength gain, which decreases the
Question 6: The safety factor of steel is _________ than that of concrete.
a) higher b) lower
c) same d) none of these
Answer: b) lower
Explanation: The standard factor of safety for concrete is taken as 1.5. Concrete requires
Question 7: The flexural strength of the concrete is directly proportional to _______.
a) square of compressive strength. b) square root of compressive strength.
c) cube root of compressive strength. d) none of these.
Answer: b) square root of compressive strength.
Explanation: The flexural strength of the concrete
Question 8: Lower compressive strength of concrete shows
a) Lower modular ratio b) Higher modular ratio
c) Higher water-cement ratio d) Lower water-cement ratio
Answer: b) Higher modular ratio
Explanation: Concrete and steel are combined as one material using the concept of modular ratio.
Question 9: ________ wall is suitable for height beyond 6m.
a) L-shaped wall b) T-shaped wall
c) Counterfort wall d) None of these
Answer: c) Counterfort wall
Explanation: Counterfort walls have this vertical slab called counterfort, equally
Question 10: Which of the following properties is possessed by cement concrete ?
a) Elastic b) Flexible
c) Porous d) All of these
Answer: c) Porous
Explanation: Cement concrete contains voids which are formed during its placement. In order to prevent porosity,