1.
For quality control of portland cement the test essentially done is......
Correct Answer
D. All the above
Explanation
The correct answer is "all the above" because for quality control of portland cement, all three tests - setting time, soundness, and tensile strength - are essential. Setting time test determines the time taken for the cement to harden, soundness test checks for any volume changes or cracks in the cement, and tensile strength test measures the ability of the cement to resist pulling forces. Conducting all these tests ensures that the cement meets the required quality standards.
2.
Wp and wf are the weigths of cylinder containing partially compacted and fully compacted concrete.if the compaction factor (wp/wf) is 0.95 the workablity of concrete is.....
Correct Answer
D. High
Explanation
If the compaction factor (wp/wf) is 0.95, it means that the weight of the partially compacted concrete is 95% of the weight of the fully compacted concrete. This suggests that the concrete is highly workable, as it can be easily compacted and molded into shape. Therefore, the workability of the concrete is high.
3.
The pitot tube is used to measure........
Correct Answer
B. Stagnation pressure
Explanation
The pitot tube is a device used to measure the stagnation pressure of a fluid flow. Stagnation pressure is the pressure exerted by a fluid when it comes to a stop or stagnates. The pitot tube is designed in such a way that it can measure this pressure accurately. It consists of a small opening facing the flow, which allows the fluid to enter the tube. The stagnation pressure is measured by comparing the pressure inside the tube with the ambient pressure. By measuring the stagnation pressure, the pitot tube can provide valuable information about the velocity and energy of the fluid flow.
4.
The hardest rock is
Correct Answer
B. Diamond
Explanation
Diamond is the hardest rock because it is composed of carbon atoms arranged in a crystal lattice structure, which gives it its exceptional hardness. The strong covalent bonds between the carbon atoms make diamond resistant to scratching and abrasion, making it the hardest known natural material. Diamond is widely used in various industries, including jewelry, cutting tools, and industrial applications that require a highly durable and scratch-resistant material.
5.
Wrough iron contains carbon upto
Correct Answer
A. 0.25%
Explanation
Wrought iron is a type of iron that has a very low carbon content, typically ranging from 0.02% to 0.08%. This makes it more malleable and ductile compared to other types of iron. The given answer of 0.25% falls within this range, indicating that it is a correct statement.
6.
Size of theodolite is specified by
Correct Answer
C. C)the diameter of lower plate
Explanation
The size of a theodolite is specified by the diameter of the lower plate. The lower plate is an important component of the theodolite, as it provides stability and support for the instrument. A larger diameter allows for a more stable base, which is crucial for accurate measurements. Additionally, a larger lower plate diameter also allows for smoother movements and easier rotation of the theodolite, making it more user-friendly. Therefore, the diameter of the lower plate is a key factor in determining the size and functionality of a theodolite.
7.
In the manfacture of cement the dry or wet mixture of calcareous and argillaceous material is burnt at a temperature between......
Correct Answer
D. D) 1500-1600 degree celcius
Explanation
The correct answer is d) 1500-1600 degree Celsius. In the manufacture of cement, the calcareous and argillaceous materials are mixed together and then burned at a high temperature. This high temperature is necessary to initiate chemical reactions that result in the formation of cement clinker. The temperature range of 1500-1600 degree Celsius ensures that the materials are properly heated to achieve the desired chemical reactions and the formation of cement clinker.
8.
A open tank contains 1m deep water with 50m depth of oil of specific gravity 0.8 above it. the intensity of pressure at the bottom of tank will be ........
Correct Answer
D. 14 kN/m2
Explanation
The intensity of pressure at the bottom of the tank can be calculated by considering the pressure due to the water and the pressure due to the oil separately. The pressure due to the water can be calculated using the formula P = ρgh, where ρ is the density of water, g is the acceleration due to gravity, and h is the height of the water column. The pressure due to the oil can be calculated using the formula P = ρgh, where ρ is the density of the oil, g is the acceleration due to gravity, and h is the height of the oil column. Adding these two pressures together, we get the total pressure at the bottom of the tank. In this case, the specific gravity of the oil is given as 0.8, which means that its density is 0.8 times the density of water. Therefore, the pressure due to the oil will be 0.8 times the pressure due to the water. Adding these two pressures together, we find that the total pressure at the bottom of the tank is 14 kN/m2.
9.
The compressive of granite is .........
Correct Answer
B. B) 70-130 MN/m2
Explanation
The compressive strength of granite is typically in the range of 70-130 MN/m2. This means that granite can withstand a significant amount of compressive force before it starts to deform or break. The wide range of values is due to the natural variation in the composition and structure of different types of granite.
10.
Which one of the following is used to measure the discharge.........
Correct Answer
B. B)venturimeter
Explanation
A venturimeter is used to measure the discharge of a fluid flow. It is a device that consists of a converging section, a throat, and a diverging section. The fluid flowing through the venturimeter causes a pressure drop at the throat, which can be measured to determine the flow rate. This makes the venturimeter an effective tool for measuring the discharge of fluids in various applications, such as in pipelines or in hydraulic systems.
11.
Maximum bending moment in a beam occurs where.......
Correct Answer
C. C)shear force is zero
Explanation
The maximum bending moment in a beam occurs where the shear force is zero. This is because the bending moment is directly related to the rate of change of the shear force along the length of the beam. When the shear force is zero, it means that there is no change in the shear force, and therefore, the bending moment is at its maximum value.
12.
For the design of a cast iron member the most appropriate theory of failure is.....
Correct Answer
B. B) Rankine's theory
Explanation
Rankine's theory is the most appropriate theory of failure for the design of a cast iron member. This theory takes into account both the tensile and compressive strengths of the material, making it suitable for cast iron which is a brittle material. It assumes that failure occurs when the maximum principal stress reaches the tensile strength of the material. This theory is widely used in the design of cast iron structures as it provides a conservative estimate of the material's strength and ensures safety.
13.
For line AB.............
Correct Answer
A. A) the forebearing of AB and backbearing of AB differ by 180 degree
Explanation
The forebearing of a line represents the direction in which the line is measured from the starting point to the ending point. The backbearing, on the other hand, represents the direction in which the line is measured from the ending point to the starting point. Since the forebearing and backbearing are measured in opposite directions, they will always differ by 180 degrees. Therefore, option a) is correct.
14.
Pascal's-second is the unit of ..........
Correct Answer
C. C) dynamic viscosity
Explanation
Pascal's-second is the unit of dynamic viscosity. Dynamic viscosity is a measure of a fluid's resistance to flow when subjected to an applied force or stress. It represents the internal friction within the fluid as it flows. Pascal's-second is the SI unit for dynamic viscosity and is defined as the force required to move a unit area of fluid at a unit velocity. Therefore, the correct answer is c) dynamic viscosity.
15.
The shear stress on a principle plane is................
Correct Answer
A. A)zero
Explanation
The shear stress on a principle plane is zero because principle planes are oriented in a way that the shear stress is minimized or eliminated. These planes are aligned with the maximum and minimum normal stresses, resulting in zero shear stress.
16.
The sum of the normal stress is.................
Correct Answer
A. A)constant
Explanation
The sum of the normal stress is constant because normal stress is the force per unit area acting perpendicular to the plane. In a system where the forces and areas remain constant, the normal stress will also remain constant. This means that regardless of the orientation or position of the plane, the sum of the normal stress will not change.
17.
Initial setting time of cement is due to..............
Correct Answer
C. C) tri-calcium aluminate
Explanation
The initial setting time of cement is due to the presence of tri-calcium aluminate. Tri-calcium aluminate is responsible for the early hydration process in cement, which leads to the formation of a solid matrix. This process determines the initial setting time, which is the time it takes for the cement to harden and gain its initial strength.
18.
If the young's modulus of elasticity of a material is twic its modulus of rigidity.the poission's ratio of the material is...................
Correct Answer
D. D)zero
Explanation
If the Young's modulus of elasticity of a material is twice its modulus of rigidity, it indicates that the material is perfectly rigid. In a perfectly rigid material, there is no lateral deformation or change in shape when subjected to an external force. This means that the material does not experience any transverse strain, which is the definition of Poisson's ratio. Therefore, the Poisson's ratio of the material would be zero.
19.
For a well defined triangle no angle should be less than the..................
Correct Answer
B. B) 30 degree
Explanation
For a well-defined triangle, no angle should be less than 30 degrees. This is because the sum of the angles in a triangle is always 180 degrees. If any angle is less than 30 degrees, then the sum of the other two angles would have to be greater than 150 degrees, which is not possible in a triangle. Therefore, 30 degrees is the minimum angle that a well-defined triangle can have.
20.
The correction for Sag is
Correct Answer
always subtractive,negative
Explanation
The correction for Sag is always subtractive and negative. This means that when correcting for sag, we need to subtract a certain amount from the measured value. Additionally, the correction will always result in a negative value. This suggests that sag is a downward deviation from the expected or desired value, and the correction involves reducing this deviation.
21.
Find the number of odd days in a decade..........................
Correct Answer
cannot be determined
22.
A man walks 10 km towards north. from there he walks 6km towards south and then he walks 3km towards east. how far with he from the reference point
Correct Answer
B. B) 5 km
Explanation
The man initially walks 10 km towards the north. Then, he walks 6 km towards the south, which cancels out a portion of the distance he covered in the north direction. Finally, he walks 3 km towards the east, which does not affect the distance from the reference point. Therefore, the man is 5 km away from the reference point.
23.
Rama told lakshmana," yesterday, I met the only brother of the daughter of my grandmother." Whom did Rama meet?
Correct Answer
D. D) either a or b
Explanation
Rama met either his uncle or his father. The statement implies that the person Rama met is a male relative who is either his uncle or his father.
24.
The last day of a century cannot be a................
Correct Answer
B. B) Tuesday
Explanation
The explanation for the correct answer is that a century consists of 100 years. Each year has 365 days, except for leap years which have 366 days. Therefore, the last day of a century would be the 365th day or the 366th day in a leap year. Since 365 is not divisible by 7, it would not align with any specific day of the week. Therefore, it is not possible for the last day of a century to be a specific day like Tuesday.
25.
Pointing to a photo, Mr.Bean said: I have n brother and sister but that fellow's father is my father's son. whose photo is it?
Correct Answer
A. A) His son's
Explanation
The photo is of Mr. Bean's son. Mr. Bean states that the person in the photo is his father's son, which means it is his own son.