Strength of Materials Questions For Competitive Exams

Strength of Materials Strength of Materials Questions For Competitive Exams

U.P.S.C., S.S.C., I.A.S., B.Sc. Engineering, Diploma and various interviews

  1. The unit of stress in S.I. units is: N/mm square, KN/mm square, N/meter square
  2. Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation is called: Stress
  3. The unit of strain is: No unit
  4. The deformation per unit length is called: Strain
  5. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to  reduce its length, the stress and strain induced is: compressive
  6. Strain is equal to Change in Length / Actual Length
  7. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is: Shear Stress, Shear Strain
  8. When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend in length, the stress and strain induced is: Tensile Stress, Tensile Strain
  9. Hooks law holds good up to Elastic Limit
  10. Proportional Limit, Elastic Limit, Yielding and thereafter Failure
  11. The ratio of linear stress to linear strain: Modulus of Elasticity
  12. The ratio of shear stress to shear strain: Modulus of Rigidity
  13. The unit of modulus of elasticity is same as those of Pressure, Stress, Modulus of Rigidity
  14. Whenever a material is loaded within elastic limit, stress is: directly proportional to strain
  15. When a change in length takes place, the strain is known as Linear Strain
  16. The modulus of elasticity for Mild Steel is approximately equal to 210 KN/mm square
  17. The change in length due to a tensile or compressive force acting on a body is given by PL/AE, where, P is Tensile or compressive force acting on the body, L is original length of the body, A is Cross-Sectional Area of the body,E is Young's modulus of the material of the body
  18. The unit of Young's Modulus is same as that of Stress
  19. Young's Modulus may be defined as the ratio of Linear Stress to Linear Strain
  20. Modulus of Rigidity may be defined as the ratio of: Shear Stress to Shear Strain
  21. Two bars of different materials and same size are subjected to same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be: 5:2
  22. The deformation of a bar under its own weight is: half the deformation if the same body is subjected to direct load equal to the weight of the body.
  23. When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is: w*l square / 2E where W is weight per unit volume of the bar
  24. The length of a conical bar is l, the diameter of the base is d and weight per unit volume is w. It is fixed at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be: w*l square/ 6E
  25. The elongation of a conical bar under its own weight is: one-third that of the prismatic bar of the same length.
  26. Strain rosettes are used to: Measure linear strain
  27. The extension of a circular bar tapering uniformly from diameter d1 at one end to the diameter d2 at the other end, and subjected to an axial pull of P is given by: 4*P*l / pie*E* d1*d2 
  28. The extension of a circular bar tapering uniformly from diameter d1 at one end to the diameter d2 at the other end, and subjected to an axial pull of P is: equal to the extension of a circular bar of diameter 'root under d1*d2' subjected to the same load P.
  29. A bar of length L metres extend by l mm under a tensile force of P, the strain produced in the bar is: 0.001l / L
  30. The ultimate tensile stress of Mild Steel is:  More than the ultimate compressive stress
  31. The shear modulus of most materials with respect to the modulus of elasticity: is less than half
  32. The maximum stress produced in a bar of tapering section is at: Smaller End
  33. A bolt is made a pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then: bolt is under tension and tube is under compression
  34. A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then: both rod and tube are under compression
  35. A steel bar of 5 mm is heated from 15-degree celsius to 40-degree Celsius and it is free to expand. The bar will induce: No Stress
  36. When a bar is subjected to a change of temperature and its deformation is prevented, the stress induces in the bar is: Thermal Stress

What is Public and Private IP Addresses?

Difference between Public and Private IP Addresses

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Private IP Addresses:

When many computers or devices connect either to the cable or to the wireless, they create a private network. Within this network, a unique IP address is assigned to share files and resets to each device. The IP address of all the devices in this network is called private address.

Public IP addresses:

The public IP address is the ISP (Internet Service Provider). This gives your home network an identity in the outside world. This IP address is unique across the Internet.

Public IP address can be static or dynamic. Static public IP address does not change and it is mainly used for accessing a service (such as an IP camera, FTP server, email server or remote access to the computer) or web hosting on the Internet. It has to be bought from ISP.

Dynamic IP address,
on the other hand, receives the IP address available and changes every time it is connected to the Internet. The maximum Internet user has a dynamic IP address for his computer, which is disconnected when disconnected from the Internet and gets a new IP address when reconnected.

What is IP Address?

IP Address definition

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IP Address means Internet Protocol. This is a Numerical label that is used to identify all the devices (i.e. computers, printers etc) of the network. Any IP address mainly works in two form, one for hosting and network interface identification and second one to identify the location of another device.

When the desingers designed the IP address, the IP address was a 32 bit number and this system was called IPv4. But now with the growth of the Internet, the 32 bit number system which got the IP Addresses started falling short, the designers launched a new IP address system called IPv6. Although IPV4 is still very popular and it is in use, it will convert to IPV6. The new IP system is the IPv6 128 bit address and it was developed in 1995. IPv6 was standardized in 1998 while deployment started from mid 2000. 

The IP address always contains 4 blocks of numbers, which are separated by period. Each block has potential ranges from 0 to 255, which means that each block has 256 potential values. For example, IP address looks like 192.168.1.10.

3 ranges from these addresses have been reserved for special purpose. The first address 0.0.0.0 is related to the default network and 255.255.255.255 are called Broadcast Addresses. The third address is the 127.0.0.1 loopback address, and it shows your own machine or computer.

IP version 4 (IPv4):

Internet Protocol version 4 (IPv4) This is the fourth version of Internet Protocol (IP), which is used to identify network devices. IPv4 addresses are 32 bits tall and support 4,294,967,296 addresses (although many of them are reserved for specific purposes, such as 10.0.0.0 and 127.0.0.0)

192.168.0.1 This is a common example of an IPv4 address. The most easily identifiable IP ranges are 192.168.0.1 - 192.168.0.255, because these addresses we use at home or office.

IP version 6 (IPv6):

A new version of Internet Protocol version 6 (IPv6) was developed due to the worsening IPv4 addressing potential future due to the popular Internet growth. This is new and unchanged version of IPv4. It is also known as IPng.

Internet Protocol version 6 (IPv6) is 128 bits long. Therefore, it supports 2 ^ 128 internet addresses, which are equivalent to 340.282.366.920.938.000.000.000.000.000.000.000 addresses. These are many addresses and they are more than enough to continue internet operations for a very long time.