Engineering Questions with Answers - Multiple Choice Questions
Strength of Materials MCQs Thin Spherical Shells Under Strain
A cylindrical section having no joint is known as _____________
a) Seamless section
b) Efficient section
c) Rivet less section
d) Anchorage section
Explanation: A cylindrical section having no joint is known as a seamless section. Built up section is not that strong as a seamless section of the same thickness.
Strength of joint = efficiency × __________
a) Strength of section
b) Depth of plate
c) Length of plate
d) Strength of plate
Explanation: The ratio of strength of joint to the strength of our plate is called the efficiency.
Strength of joint = efficiency × strength of plate.
The presence of calcium and magnesium chloride in water causes ___________
b) Bad taste
Explanation: The characteristic of water that does not give lather easily with soap is called hardness of water. It is of two types of temporary hardness and permanent hardness.
The calcium carbonate in water is _____________
a) Causes bad taste
b) Increases hardness of water
c) Causes turbidity
d) Softens water
Explanation: Calcium carbonate in the water indicates temporary hardness, it can be removed either by boiling or by adding lime to the water.
Red colour in water denotes?
Explanation: The presence of iron in the water gives red colour and the brown colour in water denotes the presence of manganese. According to the standards of water, manganese and iron should not be more than 0.3 ppm.
The water of the river has an important property known as __________
c) Infiltration capacity
d) Self purification
Explanation: The flow of water in a river has an important aspect of cleaning. In the river, there is the number of layers of fine and coarse aggregates that periodically filter the water and hence the water of a river has an important property of self purification.
The type of joint provided to release thermal stresses is called _______
a) Socket and spigot joint
b) Expansion joint
c) Flash joint
d) Simplex joint
Explanation: Expansion joints are provided at suitable intervals in the pipelines, so as to resist the thermal stresses produced due to temperature variations.
In __________ pipes, the discharging capacity reduces as the life period increases.
a) Galvanised Iron
b) Cast Iron
Explanation: Galvanised Iron pipes are heavy and uneconomical. The discharging capacity reduces as life period increases. They are likely to break during transportation and placing.
Isolated __________ decrease stability in the ecosystem.
a) Food web
b) Food chain
c) Food pyramid
d) Food numbers
Explanation: Food chain is a sequence of eating and being eaten in an ecosystem. It involves a single linear pathway. The isolated food chains decrease the stability of an ecosystem.
The presence of hydrogen sulphide in water causes ________
a) Bad taste
Explanation: The acidity of water is a measure of its capacity to neutralize bases. Acidity is nothing but a representation of carbon dioxide or carbonic acid. The presence of hydrogen sulphide indicates acidic nature in the water, it should be in a nominal amount.
The turbidity in water is expressed in terms of ________
a) pH value
b) Silica scale
d) Platinum cobalt scale
Explanation: Turbidity is an indication of the apparent colour of Water on account of suspended inorganic matter such as silt, clay and mud particles. The turbidity is expressed in silica scale.
NTU is measurement unit of _______
Explanation: Water is turbid when it contains visible material in suspension such as clay, silt, finely divided organic matter and other microscopic matter. NTU stands for nephelometric turbidity unit.
Taste and odour are expressed in terms of ______
b) Threshold numbers
c) Silica scale
Explanation: Threshold odour number is the dilution ratio at which the odour is just detectable. The odour can be estimated by osmoscope whereas colour can be estimated by calibration method.
The water is considered soft when the ppm is between _______
a) 0 – 50
b) 50 – 100
c) 100 – 150
d) Over 250
Answer: a<br />
Explanation: The water is considered soft when the ppm is between 0 – 50.
|Hardness Scale(ppm)||Nature of water|
a) Maximum proximity number
b) Most probable number
c) Membrane plate notation
d) Maximum probable notation
Explanation: Most probable number is a number which represents the bacterial density which is most likely to be present. It is one of the methods to estimate the bacterial quantity of water.