# Strength of Materials Questions and Answers – Thin Cylinder due to Hoop Stress

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Thin Cylinder due to Hoop Stress”.

1. Which of the following stress can also be known as hoop stress?
a) Axial stress
b) Longitudinal stress
c) Fluid stress
d) Circumferential stress

Explanation: Circumferential stress in the shell = f = Total pressure / resisting section
f = pdl/2tl
f = pd/2t.
Circumstantial stress can also be known as hoop stress.

2. A water main of 1.5 m diameter and 20 mm thick is subjected to an pressure of 1.5N/mm2. Calculate the circumferential stress induced in the pipe.
a) 78.65 N/mm2
b) 68.45 N/mm2
c) 56.25 N/mm2
d) 60.85 N/mm2

Explanation: Diameter of water main = 1500 mm and internal pressure = 1.5 N/mm2
Thickness = 20 mm
Hoop stress = pd/2t = 1500 × 1.5/ 2× 20.
= 56.25 N/mm2.

3. Which of the following method is also known as overhead irrigation method?
a) Drip Irrigation
b) Sprinkler
c) Contour
d) Check flooding

Explanation: Sprinkler irrigation method is used where the soil is erodable type and high permeable. It is also known as overhead irrigation. The sprinkler method requires a large investment in installing.
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4. The average diameter of particles of silt is __________
a) 0.08mm
b) 0.002 mm
c) 1.2 mm
d) 0.011

Explanation: The average diameter of particles of silt is 0.002 mm.

Group Average Diameter in mm
Sand 2 to 0.06 mm
Silt 0.06 to 0.002 mm
Clay < 0.002 mm

5. pH is measured in ____
a) gram / litre
b) gram/cm
c) cusecs
d) cumecs

Explanation: pH value in a chemical term which shows acidity or alkalinity of the matter. The pH value is a logarithm of the reciprocal of the hydrogen in concentration measured in gram per litre.

6. Soil moisture stress is defined as the sum of soil moisture tension and ______ pressure of soil solution.
a) Weed
b) Perforated
c) Osmatic
d) Uplift

Explanation: The increase in the force caused by salts is called osmatic pressure. The soil moisture stress is defined as the sum of soil moisture tension and osmotic pressure of soil solution.

7. In coarse textured sandy soils, the field capacity can be achieved in _________
a) 1 to 3 days
b) 2 to 5 days
c) 3 to 7 days
d) 5 to 8 days

Explanation: The moisture content held by soil after gravitational water has drained off from a saturated soil is called field capacity. In coarse textured soils, the field capacity can be achieved in 1 to 3 days.

8. Acid in the rain was first detected by ___________
a) Lacy Film
b) Angus smith
c) Graeme Robert
d) Mesh swann

Explanation: The amount of acid which falls as towards earth with the rain water and snow is called acid rain. The acid in the rain water was detected for the first time by Robert Angus Smith in 1872.

9. _________ causes deterioration of buildings and monuments.
a) Acid rain
b) Green house effect
c) Global warning
d) Ozone layer depletion

Explanation: Acid rain causes a number of harmful effects below pH 5.1. The effects are visible in the aquatic system even at pH less than 5.5. It causes deterioration of buildings especially made of marble. It damages stone statues, metals and car finishes.

10. Expand CFC _________
a) Chlorofluorochloride
b) Carbonfluorochlorine
c) Chlorofluorocarbon

Explanation: CFC stands for Chlorofluorocarbon. It is one of the major gases of the greenhouse. It is released from refrigerators, air conditioners etc.

11. ______ is mainly responsible for ozone depletion in the stratosphere.
a) CFC
b) MNC
c) ESC
d) FSC

Explanation: Over last 450 million years, the earth had a natural sunscreen in the stratosphere called the ozone layer. This layer filters out harmful ultraviolet rays from the sunlight and the protects various life forms on the earth. CFC is mainly responsible for ozone depletion in the stratosphere.

12. Fossil fuels are example for ________
a) Exhaustible resources
b) Renewable resources
c) Non renewable resources
d) Inexhaustible resources

Explanation: Non renewable resources lack the ability of recycling and replacement. The substances with a very long recycling time are also regarded to be non renewable resources. Ex: biological species, minerals &fossil fuels.

13. Nuclear energy is __________
a) Renewable energy resource
b) Non renewable energy resource
c) Exhaustible resource
d) Inexhaustible resource

Explanation: Non renewable energy resources mainly include fossil fuels and nuclear energy. The fossil fuels are found inside earth’s crust. The nuclear energy obtained through fission or fusion reaction which yields large amount of heat energy.

14. Geothermal Energy is _________
a) Renewable energy resource
b) Natural resource
c) Sustainable resource
d) Exhaustible resource

Explanation: In some places, the heated water comes to the earth surface as hot springs. It can be used for heating water and buildings and for generating electricity. This is known as geothermal energy and it is a renewable energy resource.

15. The study of ecosystems is known as _________
a) Echography
b) Bibliograph
c) Ecology
d) Biology

Explanation: Ecology deals with the study of organisms in their natural home interacting with their surroundings. Now ecology is often defined as the study of ecosystems.

Sanfoundry Global Education & Learning Series – Strength of Materials.

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